perf_counter tools: add in basic glue from Git

First very raw version at having a central 'perf' command and
a list of subcommands:

  perf top
  perf stat
  perf record
  perf report
  ...

This is done by picking up Git's collection of utility functions,
and hacking them to build fine in this new environment.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

35 files changed, 7953 insertions, 859 deletions

diff --git a/Documentation/perf_counter/.gitignore b/Documentation/perf_counter/.gitignore
new file mode 100644
index 000000000000..41c0b20a76ce
--- /dev/null
+++ b/Documentation/perf_counter/.gitignore
@@ -0,0 +1,179 @@
+GIT-BUILD-OPTIONS
+GIT-CFLAGS
+GIT-GUI-VARS
+GIT-VERSION-FILE
+git
+git-add
+git-add--interactive
+git-am
+git-annotate
+git-apply
+git-archimport
+git-archive
+git-bisect
+git-bisect--helper
+git-blame
+git-branch
+git-bundle
+git-cat-file
+git-check-attr
+git-check-ref-format
+git-checkout
+git-checkout-index
+git-cherry
+git-cherry-pick
+git-clean
+git-clone
+git-commit
+git-commit-tree
+git-config
+git-count-objects
+git-cvsexportcommit
+git-cvsimport
+git-cvsserver
+git-daemon
+git-diff
+git-diff-files
+git-diff-index
+git-diff-tree
+git-difftool
+git-difftool--helper
+git-describe
+git-fast-export
+git-fast-import
+git-fetch
+git-fetch--tool
+git-fetch-pack
+git-filter-branch
+git-fmt-merge-msg
+git-for-each-ref
+git-format-patch
+git-fsck
+git-fsck-objects
+git-gc
+git-get-tar-commit-id
+git-grep
+git-hash-object
+git-help
+git-http-fetch
+git-http-push
+git-imap-send
+git-index-pack
+git-init
+git-init-db
+git-instaweb
+git-log
+git-lost-found
+git-ls-files
+git-ls-remote
+git-ls-tree
+git-mailinfo
+git-mailsplit
+git-merge
+git-merge-base
+git-merge-index
+git-merge-file
+git-merge-tree
+git-merge-octopus
+git-merge-one-file
+git-merge-ours
+git-merge-recursive
+git-merge-resolve
+git-merge-subtree
+git-mergetool
+git-mergetool--lib
+git-mktag
+git-mktree
+git-name-rev
+git-mv
+git-pack-redundant
+git-pack-objects
+git-pack-refs
+git-parse-remote
+git-patch-id
+git-peek-remote
+git-prune
+git-prune-packed
+git-pull
+git-push
+git-quiltimport
+git-read-tree
+git-rebase
+git-rebase--interactive
+git-receive-pack
+git-reflog
+git-relink
+git-remote
+git-repack
+git-repo-config
+git-request-pull
+git-rerere
+git-reset
+git-rev-list
+git-rev-parse
+git-revert
+git-rm
+git-send-email
+git-send-pack
+git-sh-setup
+git-shell
+git-shortlog
+git-show
+git-show-branch
+git-show-index
+git-show-ref
+git-stage
+git-stash
+git-status
+git-stripspace
+git-submodule
+git-svn
+git-symbolic-ref
+git-tag
+git-tar-tree
+git-unpack-file
+git-unpack-objects
+git-update-index
+git-update-ref
+git-update-server-info
+git-upload-archive
+git-upload-pack
+git-var
+git-verify-pack
+git-verify-tag
+git-web--browse
+git-whatchanged
+git-write-tree
+git-core-*/?*
+gitk-wish
+gitweb/gitweb.cgi
+test-chmtime
+test-ctype
+test-date
+test-delta
+test-dump-cache-tree
+test-genrandom
+test-match-trees
+test-parse-options
+test-path-utils
+test-sha1
+test-sigchain
+common-cmds.h
+*.tar.gz
+*.dsc
+*.deb
+git.spec
+*.exe
+*.[aos]
+*.py[co]
+config.mak
+autom4te.cache
+config.cache
+config.log
+config.status
+config.mak.autogen
+config.mak.append
+configure
+tags
+TAGS
+cscope*
diff --git a/Documentation/perf_counter/Makefile b/Documentation/perf_counter/Makefile
index 6e0838b03ad1..11809b943fc3 100644
--- a/Documentation/perf_counter/Makefile
+++ b/Documentation/perf_counter/Makefile
@@ -13,16 +13,9 @@ all::
 # Define NO_OPENSSL environment variable if you do not have OpenSSL.
 # This also implies MOZILLA_SHA1.
 #
-# Define NO_CURL if you do not have libcurl installed.  git-http-pull and
-# git-http-push are not built, and you cannot use http:// and https://
-# transports.
-#
 # Define CURLDIR=/foo/bar if your curl header and library files are in
 # /foo/bar/include and /foo/bar/lib directories.
 #
-# Define NO_EXPAT if you do not have expat installed.  git-http-push is
-# not built, and you cannot push using http:// and https:// transports.
-#
 # Define EXPATDIR=/foo/bar if your expat header and library files are in
 # /foo/bar/include and /foo/bar/lib directories.
 #
@@ -40,8 +33,6 @@ all::
 #
 # Define NO_MEMMEM if you don't have memmem.
 #
-# Define NO_STRLCPY if you don't have strlcpy.
-#
 # Define NO_STRTOUMAX if you don't have strtoumax in the C library.
 # If your compiler also does not support long long or does not have
 # strtoull, define NO_STRTOULL.
@@ -54,7 +45,7 @@ all::
 #
 # Define NO_SYS_SELECT_H if you don't have sys/select.h.
 #
-# Define NO_SYMLINK_HEAD if you never want .git/HEAD to be a symbolic link.
+# Define NO_SYMLINK_HEAD if you never want .perf/HEAD to be a symbolic link.
 # Enable it on Windows.  By default, symrefs are still used.
 #
 # Define NO_SVN_TESTS if you want to skip time-consuming SVN interoperability
@@ -62,13 +53,13 @@ all::
 # but are not needed unless you plan to talk to SVN repos.
 #
 # Define NO_FINK if you are building on Darwin/Mac OS X, have Fink
-# installed in /sw, but don't want GIT to link against any libraries
+# installed in /sw, but don't want PERF to link against any libraries
 # installed there.  If defined you may specify your own (or Fink's)
 # include directories and library directories by defining CFLAGS
 # and LDFLAGS appropriately.
 #
 # Define NO_DARWIN_PORTS if you are building on Darwin/Mac OS X,
-# have DarwinPorts installed in /opt/local, but don't want GIT to
+# have DarwinPorts installed in /opt/local, but don't want PERF to
 # link against any libraries installed there.  If defined you may
 # specify your own (or DarwinPort's) include directories and
 # library directories by defining CFLAGS and LDFLAGS appropriately.
@@ -120,7 +111,7 @@ all::
 # that tells runtime paths to dynamic libraries;
 # "-Wl,-rpath=/path/lib" is used instead.
 #
-# Define USE_NSEC below if you want git to care about sub-second file mtimes
+# Define USE_NSEC below if you want perf to care about sub-second file mtimes
 # and ctimes. Note that you need recent glibc (at least 2.2.4) for this, and
 # it will BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely
 # randomly break unless your underlying filesystem supports those sub-second
@@ -132,7 +123,7 @@ all::
 # Define NO_NSEC if your "struct stat" does not have "st_ctim.tv_nsec"
 # available.  This automatically turns USE_NSEC off.
 #
-# Define USE_STDEV below if you want git to care about the underlying device
+# Define USE_STDEV below if you want perf to care about the underlying device
 # change being considered an inode change from the update-index perspective.
 #
 # Define NO_ST_BLOCKS_IN_STRUCT_STAT if your platform does not have st_blocks
@@ -150,27 +141,24 @@ all::
 # Define NO_TCLTK if you do not want Tcl/Tk GUI.
 #
 # The TCL_PATH variable governs the location of the Tcl interpreter
-# used to optimize git-gui for your system.  Only used if NO_TCLTK
+# used to optimize perf-gui for your system.  Only used if NO_TCLTK
 # is not set.  Defaults to the bare 'tclsh'.
 #
 # The TCLTK_PATH variable governs the location of the Tcl/Tk interpreter.
 # If not set it defaults to the bare 'wish'. If it is set to the empty
 # string then NO_TCLTK will be forced (this is used by configure script).
 #
-# Define THREADED_DELTA_SEARCH if you have pthreads and wish to exploit
-# parallel delta searching when packing objects.
-#
 # Define INTERNAL_QSORT to use Git's implementation of qsort(), which
 # is a simplified version of the merge sort used in glibc. This is
 # recommended if Git triggers O(n^2) behavior in your platform's qsort().
 #
-# Define NO_EXTERNAL_GREP if you don't want "git grep" to ever call
+# Define NO_EXTERNAL_GREP if you don't want "perf grep" to ever call
 # your external grep (e.g., if your system lacks grep, if its grep is
-# broken, or spawning external process is slower than built-in grep git has).
+# broken, or spawning external process is slower than built-in grep perf has).
 
-GIT-VERSION-FILE: .FORCE-GIT-VERSION-FILE
-        @$(SHELL_PATH) ./GIT-VERSION-GEN
--include GIT-VERSION-FILE
+PERF-VERSION-FILE: .FORCE-PERF-VERSION-FILE
+        @$(SHELL_PATH) ./PERF-VERSION-GEN
+-include PERF-VERSION-FILE
 
 uname_S := $(shell sh -c 'uname -s 2>/dev/null || echo not')
 uname_M := $(shell sh -c 'uname -m 2>/dev/null || echo not')
@@ -182,20 +170,20 @@ uname_V := $(shell sh -c 'uname -v 2>/dev/null || echo not')
 # CFLAGS and LDFLAGS are for the users to override from the command line.
 
 CFLAGS = -g -O2 -Wall
-LDFLAGS =
+LDFLAGS = -lpthread -lrt
 ALL_CFLAGS = $(CFLAGS)
 ALL_LDFLAGS = $(LDFLAGS)
 STRIP ?= strip
 
 # Among the variables below, these:
-#   gitexecdir
+#   perfexecdir
 #   template_dir
 #   mandir
 #   infodir
 #   htmldir
-#   ETC_GITCONFIG (but not sysconfdir)
+#   ETC_PERFCONFIG (but not sysconfdir)
 # can be specified as a relative path some/where/else;
-# this is interpreted as relative to $(prefix) and "git" at
+# this is interpreted as relative to $(prefix) and "perf" at
 # runtime figures out where they are based on the path to the executable.
 # This can help installing the suite in a relocatable way.
 
@@ -204,38 +192,20 @@ bindir_relative = bin
 bindir = $(prefix)/$(bindir_relative)
 mandir = share/man
 infodir = share/info
-gitexecdir = libexec/git-core
+perfexecdir = libexec/perf-core
 sharedir = $(prefix)/share
-template_dir = share/git-core/templates
-htmldir = share/doc/git-doc
+template_dir = share/perf-core/templates
+htmldir = share/doc/perf-doc
 ifeq ($(prefix),/usr)
 sysconfdir = /etc
-ETC_GITCONFIG = $(sysconfdir)/gitconfig
+ETC_PERFCONFIG = $(sysconfdir)/perfconfig
 else
 sysconfdir = $(prefix)/etc
-ETC_GITCONFIG = etc/gitconfig
+ETC_PERFCONFIG = etc/perfconfig
 endif
 lib = lib
 # DESTDIR=
 
-# default configuration for gitweb
-GITWEB_CONFIG = gitweb_config.perl
-GITWEB_CONFIG_SYSTEM = /etc/gitweb.conf
-GITWEB_HOME_LINK_STR = projects
-GITWEB_SITENAME =
-GITWEB_PROJECTROOT = /pub/git
-GITWEB_PROJECT_MAXDEPTH = 2007
-GITWEB_EXPORT_OK =
-GITWEB_STRICT_EXPORT =
-GITWEB_BASE_URL =
-GITWEB_LIST =
-GITWEB_HOMETEXT = indextext.html
-GITWEB_CSS = gitweb.css
-GITWEB_LOGO = git-logo.png
-GITWEB_FAVICON = git-favicon.png
-GITWEB_SITE_HEADER =
-GITWEB_SITE_FOOTER =
-
 export prefix bindir sharedir sysconfdir
 
 CC = gcc
@@ -277,89 +247,46 @@ SCRIPT_PERL =
 SCRIPT_SH =
 TEST_PROGRAMS =
 
-SCRIPT_SH += git-am.sh
-SCRIPT_SH += git-bisect.sh
-SCRIPT_SH += git-difftool--helper.sh
-SCRIPT_SH += git-filter-branch.sh
-SCRIPT_SH += git-lost-found.sh
-SCRIPT_SH += git-merge-octopus.sh
-SCRIPT_SH += git-merge-one-file.sh
-SCRIPT_SH += git-merge-resolve.sh
-SCRIPT_SH += git-mergetool.sh
-SCRIPT_SH += git-mergetool--lib.sh
-SCRIPT_SH += git-parse-remote.sh
-SCRIPT_SH += git-pull.sh
-SCRIPT_SH += git-quiltimport.sh
-SCRIPT_SH += git-rebase--interactive.sh
-SCRIPT_SH += git-rebase.sh
-SCRIPT_SH += git-repack.sh
-SCRIPT_SH += git-request-pull.sh
-SCRIPT_SH += git-sh-setup.sh
-SCRIPT_SH += git-stash.sh
-SCRIPT_SH += git-submodule.sh
-SCRIPT_SH += git-web--browse.sh
-
-SCRIPT_PERL += git-add--interactive.perl
-SCRIPT_PERL += git-difftool.perl
-SCRIPT_PERL += git-archimport.perl
-SCRIPT_PERL += git-cvsexportcommit.perl
-SCRIPT_PERL += git-cvsimport.perl
-SCRIPT_PERL += git-cvsserver.perl
-SCRIPT_PERL += git-relink.perl
-SCRIPT_PERL += git-send-email.perl
-SCRIPT_PERL += git-svn.perl
+#
+# No scripts right now:
+#
+
+# SCRIPT_SH += perf-am.sh
+
+#
+# No Perl scripts right now:
+#
+
+# SCRIPT_PERL += perf-add--interactive.perl
 
 SCRIPTS = $(patsubst %.sh,%,$(SCRIPT_SH)) \
-          $(patsubst %.perl,%,$(SCRIPT_PERL)) \
-          git-instaweb
+          $(patsubst %.perl,%,$(SCRIPT_PERL))
 
 # Empty...
 EXTRA_PROGRAMS =
 
-# ... and all the rest that could be moved out of bindir to gitexecdir
+# ... and all the rest that could be moved out of bindir to perfexecdir
 PROGRAMS += $(EXTRA_PROGRAMS)
-PROGRAMS += git-fast-import$X
-PROGRAMS += git-hash-object$X
-PROGRAMS += git-index-pack$X
-PROGRAMS += git-merge-index$X
-PROGRAMS += git-merge-tree$X
-PROGRAMS += git-mktag$X
-PROGRAMS += git-mktree$X
-PROGRAMS += git-pack-redundant$X
-PROGRAMS += git-patch-id$X
-PROGRAMS += git-shell$X
-PROGRAMS += git-show-index$X
-PROGRAMS += git-unpack-file$X
-PROGRAMS += git-update-server-info$X
-PROGRAMS += git-upload-pack$X
-PROGRAMS += git-var$X
+
+#
+# None right now:
+#
+# PROGRAMS += perf-fast-import$X
 
 # List built-in command $C whose implementation cmd_$C() is not in
 # builtin-$C.o but is linked in as part of some other command.
-BUILT_INS += $(patsubst builtin-%.o,git-%$X,$(BUILTIN_OBJS))
-
-BUILT_INS += git-cherry$X
-BUILT_INS += git-cherry-pick$X
-BUILT_INS += git-format-patch$X
-BUILT_INS += git-fsck-objects$X
-BUILT_INS += git-get-tar-commit-id$X
-BUILT_INS += git-init$X
-BUILT_INS += git-merge-subtree$X
-BUILT_INS += git-peek-remote$X
-BUILT_INS += git-repo-config$X
-BUILT_INS += git-show$X
-BUILT_INS += git-stage$X
-BUILT_INS += git-status$X
-BUILT_INS += git-whatchanged$X
-
-# what 'all' will build and 'install' will install, in gitexecdir
+BUILT_INS += $(patsubst builtin-%.o,perf-%$X,$(BUILTIN_OBJS))
+
+#
+# None right now:
+#
+# BUILT_INS += perf-init $X
+
+# what 'all' will build and 'install' will install, in perfexecdir
 ALL_PROGRAMS = $(PROGRAMS) $(SCRIPTS)
 
-# what 'all' will build but not install in gitexecdir
-OTHER_PROGRAMS = git$X
-ifndef NO_PERL
-OTHER_PROGRAMS += gitweb/gitweb.cgi
-endif
+# what 'all' will build but not install in perfexecdir
+OTHER_PROGRAMS = perf$X
 
 # Set paths to tools early so that they can be used for version tests.
 ifndef SHELL_PATH
@@ -371,250 +298,34 @@ endif
 
 export PERL_PATH
 
-LIB_FILE=libgit.a
-XDIFF_LIB=xdiff/lib.a
-
-LIB_H += archive.h
-LIB_H += attr.h
-LIB_H += blob.h
-LIB_H += builtin.h
-LIB_H += cache.h
-LIB_H += cache-tree.h
-LIB_H += commit.h
-LIB_H += compat/cygwin.h
-LIB_H += compat/mingw.h
-LIB_H += csum-file.h
-LIB_H += decorate.h
-LIB_H += delta.h
-LIB_H += diffcore.h
-LIB_H += diff.h
-LIB_H += dir.h
-LIB_H += fsck.h
-LIB_H += git-compat-util.h
-LIB_H += graph.h
-LIB_H += grep.h
-LIB_H += hash.h
-LIB_H += help.h
+LIB_FILE=libperf.a
+
+LIB_H += ../../include/linux/perf_counter.h
 LIB_H += levenshtein.h
-LIB_H += list-objects.h
-LIB_H += ll-merge.h
-LIB_H += log-tree.h
-LIB_H += mailmap.h
-LIB_H += merge-recursive.h
-LIB_H += object.h
-LIB_H += pack.h
-LIB_H += pack-refs.h
-LIB_H += pack-revindex.h
 LIB_H += parse-options.h
-LIB_H += patch-ids.h
-LIB_H += pkt-line.h
-LIB_H += progress.h
 LIB_H += quote.h
-LIB_H += reflog-walk.h
-LIB_H += refs.h
-LIB_H += remote.h
-LIB_H += rerere.h
-LIB_H += revision.h
-LIB_H += run-command.h
-LIB_H += sha1-lookup.h
-LIB_H += sideband.h
-LIB_H += sigchain.h
 LIB_H += strbuf.h
-LIB_H += string-list.h
-LIB_H += tag.h
-LIB_H += transport.h
-LIB_H += tree.h
-LIB_H += tree-walk.h
-LIB_H += unpack-trees.h
-LIB_H += userdiff.h
-LIB_H += utf8.h
-LIB_H += wt-status.h
+LIB_H += run-command.h
 
 LIB_OBJS += abspath.o
 LIB_OBJS += alias.o
-LIB_OBJS += alloc.o
-LIB_OBJS += archive.o
-LIB_OBJS += archive-tar.o
-LIB_OBJS += archive-zip.o
-LIB_OBJS += attr.o
-LIB_OBJS += base85.o
-LIB_OBJS += bisect.o
-LIB_OBJS += blob.o
-LIB_OBJS += branch.o
-LIB_OBJS += bundle.o
-LIB_OBJS += cache-tree.o
-LIB_OBJS += color.o
-LIB_OBJS += combine-diff.o
-LIB_OBJS += commit.o
 LIB_OBJS += config.o
-LIB_OBJS += connect.o
-LIB_OBJS += convert.o
-LIB_OBJS += copy.o
-LIB_OBJS += csum-file.o
 LIB_OBJS += ctype.o
-LIB_OBJS += date.o
-LIB_OBJS += decorate.o
-LIB_OBJS += diffcore-break.o
-LIB_OBJS += diffcore-delta.o
-LIB_OBJS += diffcore-order.o
-LIB_OBJS += diffcore-pickaxe.o
-LIB_OBJS += diffcore-rename.o
-LIB_OBJS += diff-delta.o
-LIB_OBJS += diff-lib.o
-LIB_OBJS += diff-no-index.o
-LIB_OBJS += diff.o
-LIB_OBJS += dir.o
-LIB_OBJS += editor.o
-LIB_OBJS += entry.o
-LIB_OBJS += environment.o
 LIB_OBJS += exec_cmd.o
-LIB_OBJS += fsck.o
-LIB_OBJS += graph.o
-LIB_OBJS += grep.o
-LIB_OBJS += hash.o
 LIB_OBJS += help.o
-LIB_OBJS += ident.o
 LIB_OBJS += levenshtein.o
-LIB_OBJS += list-objects.o
-LIB_OBJS += ll-merge.o
-LIB_OBJS += lockfile.o
-LIB_OBJS += log-tree.o
-LIB_OBJS += mailmap.o
-LIB_OBJS += match-trees.o
-LIB_OBJS += merge-file.o
-LIB_OBJS += merge-recursive.o
-LIB_OBJS += name-hash.o
-LIB_OBJS += object.o
-LIB_OBJS += pack-check.o
-LIB_OBJS += pack-refs.o
-LIB_OBJS += pack-revindex.o
-LIB_OBJS += pack-write.o
-LIB_OBJS += pager.o
 LIB_OBJS += parse-options.o
-LIB_OBJS += patch-delta.o
-LIB_OBJS += patch-ids.o
 LIB_OBJS += path.o
-LIB_OBJS += pkt-line.o
-LIB_OBJS += preload-index.o
-LIB_OBJS += pretty.o
-LIB_OBJS += progress.o
-LIB_OBJS += quote.o
-LIB_OBJS += reachable.o
-LIB_OBJS += read-cache.o
-LIB_OBJS += reflog-walk.o
-LIB_OBJS += refs.o
-LIB_OBJS += remote.o
-LIB_OBJS += rerere.o
-LIB_OBJS += revision.o
 LIB_OBJS += run-command.o
-LIB_OBJS += server-info.o
-LIB_OBJS += setup.o
-LIB_OBJS += sha1-lookup.o
-LIB_OBJS += sha1_file.o
-LIB_OBJS += sha1_name.o
-LIB_OBJS += shallow.o
-LIB_OBJS += sideband.o
-LIB_OBJS += sigchain.o
+LIB_OBJS += quote.o
 LIB_OBJS += strbuf.o
-LIB_OBJS += string-list.o
-LIB_OBJS += symlinks.o
-LIB_OBJS += tag.o
-LIB_OBJS += trace.o
-LIB_OBJS += transport.o
-LIB_OBJS += tree-diff.o
-LIB_OBJS += tree.o
-LIB_OBJS += tree-walk.o
-LIB_OBJS += unpack-trees.o
 LIB_OBJS += usage.o
-LIB_OBJS += userdiff.o
-LIB_OBJS += utf8.o
-LIB_OBJS += walker.o
 LIB_OBJS += wrapper.o
-LIB_OBJS += write_or_die.o
-LIB_OBJS += ws.o
-LIB_OBJS += wt-status.o
-LIB_OBJS += xdiff-interface.o
-
-BUILTIN_OBJS += builtin-add.o
-BUILTIN_OBJS += builtin-annotate.o
-BUILTIN_OBJS += builtin-apply.o
-BUILTIN_OBJS += builtin-archive.o
-BUILTIN_OBJS += builtin-bisect--helper.o
-BUILTIN_OBJS += builtin-blame.o
-BUILTIN_OBJS += builtin-branch.o
-BUILTIN_OBJS += builtin-bundle.o
-BUILTIN_OBJS += builtin-cat-file.o
-BUILTIN_OBJS += builtin-check-attr.o
-BUILTIN_OBJS += builtin-check-ref-format.o
-BUILTIN_OBJS += builtin-checkout-index.o
-BUILTIN_OBJS += builtin-checkout.o
-BUILTIN_OBJS += builtin-clean.o
-BUILTIN_OBJS += builtin-clone.o
-BUILTIN_OBJS += builtin-commit-tree.o
-BUILTIN_OBJS += builtin-commit.o
-BUILTIN_OBJS += builtin-config.o
-BUILTIN_OBJS += builtin-count-objects.o
-BUILTIN_OBJS += builtin-describe.o
-BUILTIN_OBJS += builtin-diff-files.o
-BUILTIN_OBJS += builtin-diff-index.o
-BUILTIN_OBJS += builtin-diff-tree.o
-BUILTIN_OBJS += builtin-diff.o
-BUILTIN_OBJS += builtin-fast-export.o
-BUILTIN_OBJS += builtin-fetch--tool.o
-BUILTIN_OBJS += builtin-fetch-pack.o
-BUILTIN_OBJS += builtin-fetch.o
-BUILTIN_OBJS += builtin-fmt-merge-msg.o
-BUILTIN_OBJS += builtin-for-each-ref.o
-BUILTIN_OBJS += builtin-fsck.o
-BUILTIN_OBJS += builtin-gc.o
-BUILTIN_OBJS += builtin-grep.o
+
 BUILTIN_OBJS += builtin-help.o
-BUILTIN_OBJS += builtin-init-db.o
-BUILTIN_OBJS += builtin-log.o
-BUILTIN_OBJS += builtin-ls-files.o
-BUILTIN_OBJS += builtin-ls-remote.o
-BUILTIN_OBJS += builtin-ls-tree.o
-BUILTIN_OBJS += builtin-mailinfo.o
-BUILTIN_OBJS += builtin-mailsplit.o
-BUILTIN_OBJS += builtin-merge.o
-BUILTIN_OBJS += builtin-merge-base.o
-BUILTIN_OBJS += builtin-merge-file.o
-BUILTIN_OBJS += builtin-merge-ours.o
-BUILTIN_OBJS += builtin-merge-recursive.o
-BUILTIN_OBJS += builtin-mv.o
-BUILTIN_OBJS += builtin-name-rev.o
-BUILTIN_OBJS += builtin-pack-objects.o
-BUILTIN_OBJS += builtin-pack-refs.o
-BUILTIN_OBJS += builtin-prune-packed.o
-BUILTIN_OBJS += builtin-prune.o
-BUILTIN_OBJS += builtin-push.o
-BUILTIN_OBJS += builtin-read-tree.o
-BUILTIN_OBJS += builtin-receive-pack.o
-BUILTIN_OBJS += builtin-reflog.o
-BUILTIN_OBJS += builtin-remote.o
-BUILTIN_OBJS += builtin-rerere.o
-BUILTIN_OBJS += builtin-reset.o
-BUILTIN_OBJS += builtin-rev-list.o
-BUILTIN_OBJS += builtin-rev-parse.o
-BUILTIN_OBJS += builtin-revert.o
-BUILTIN_OBJS += builtin-rm.o
-BUILTIN_OBJS += builtin-send-pack.o
-BUILTIN_OBJS += builtin-shortlog.o
-BUILTIN_OBJS += builtin-show-branch.o
-BUILTIN_OBJS += builtin-show-ref.o
-BUILTIN_OBJS += builtin-stripspace.o
-BUILTIN_OBJS += builtin-symbolic-ref.o
-BUILTIN_OBJS += builtin-tag.o
-BUILTIN_OBJS += builtin-tar-tree.o
-BUILTIN_OBJS += builtin-unpack-objects.o
-BUILTIN_OBJS += builtin-update-index.o
-BUILTIN_OBJS += builtin-update-ref.o
-BUILTIN_OBJS += builtin-upload-archive.o
-BUILTIN_OBJS += builtin-verify-pack.o
-BUILTIN_OBJS += builtin-verify-tag.o
-BUILTIN_OBJS += builtin-write-tree.o
-
-GITLIBS = $(LIB_FILE) $(XDIFF_LIB)
+BUILTIN_OBJS += builtin-top.o
+
+PERFLIBS = $(LIB_FILE)
 EXTLIBS =
 
 #
@@ -625,221 +336,6 @@ EXTLIBS =
 # because maintaining the nesting to match is a pain.  If
 # we had "elif" things would have been much nicer...
 
-ifeq ($(uname_S),Linux)
-        NO_STRLCPY = YesPlease
-        THREADED_DELTA_SEARCH = YesPlease
-endif
-ifeq ($(uname_S),GNU/kFreeBSD)
-        NO_STRLCPY = YesPlease
-        THREADED_DELTA_SEARCH = YesPlease
-endif
-ifeq ($(uname_S),UnixWare)
-        CC = cc
-        NEEDS_SOCKET = YesPlease
-        NEEDS_NSL = YesPlease
-        NEEDS_SSL_WITH_CRYPTO = YesPlease
-        NEEDS_LIBICONV = YesPlease
-        SHELL_PATH = /usr/local/bin/bash
-        NO_IPV6 = YesPlease
-        NO_HSTRERROR = YesPlease
-        BASIC_CFLAGS += -Kthread
-        BASIC_CFLAGS += -I/usr/local/include
-        BASIC_LDFLAGS += -L/usr/local/lib
-        INSTALL = ginstall
-        TAR = gtar
-        NO_STRCASESTR = YesPlease
-        NO_MEMMEM = YesPlease
-endif
-ifeq ($(uname_S),SCO_SV)
-        ifeq ($(uname_R),3.2)
-                CFLAGS = -O2
-        endif
-        ifeq ($(uname_R),5)
-                CC = cc
-                BASIC_CFLAGS += -Kthread
-        endif
-        NEEDS_SOCKET = YesPlease
-        NEEDS_NSL = YesPlease
-        NEEDS_SSL_WITH_CRYPTO = YesPlease
-        NEEDS_LIBICONV = YesPlease
-        SHELL_PATH = /usr/bin/bash
-        NO_IPV6 = YesPlease
-        NO_HSTRERROR = YesPlease
-        BASIC_CFLAGS += -I/usr/local/include
-        BASIC_LDFLAGS += -L/usr/local/lib
-        NO_STRCASESTR = YesPlease
-        NO_MEMMEM = YesPlease
-        INSTALL = ginstall
-        TAR = gtar
-endif
-ifeq ($(uname_S),Darwin)
-        NEEDS_SSL_WITH_CRYPTO = YesPlease
-        NEEDS_LIBICONV = YesPlease
-        ifeq ($(shell expr "$(uname_R)" : '[15678]\.'),2)
-                OLD_ICONV = UnfortunatelyYes
-        endif
-        ifeq ($(shell expr "$(uname_R)" : '[15]\.'),2)
-                NO_STRLCPY = YesPlease
-        endif
-        NO_MEMMEM = YesPlease
-        THREADED_DELTA_SEARCH = YesPlease
-        USE_ST_TIMESPEC = YesPlease
-endif
-ifeq ($(uname_S),SunOS)
-        NEEDS_SOCKET = YesPlease
-        NEEDS_NSL = YesPlease
-        SHELL_PATH = /bin/bash
-        NO_STRCASESTR = YesPlease
-        NO_MEMMEM = YesPlease
-        NO_HSTRERROR = YesPlease
-        NO_MKDTEMP = YesPlease
-        OLD_ICONV = UnfortunatelyYes
-        ifeq ($(uname_R),5.8)
-                NO_UNSETENV = YesPlease
-                NO_SETENV = YesPlease
-                NO_C99_FORMAT = YesPlease
-                NO_STRTOUMAX = YesPlease
-        endif
-        ifeq ($(uname_R),5.9)
-                NO_UNSETENV = YesPlease
-                NO_SETENV = YesPlease
-                NO_C99_FORMAT = YesPlease
-                NO_STRTOUMAX = YesPlease
-        endif
-        INSTALL = ginstall
-        TAR = gtar
-        BASIC_CFLAGS += -D__EXTENSIONS__
-endif
-ifeq ($(uname_O),Cygwin)
-        NO_D_TYPE_IN_DIRENT = YesPlease
-        NO_D_INO_IN_DIRENT = YesPlease
-        NO_STRCASESTR = YesPlease
-        NO_MEMMEM = YesPlease
-        NO_SYMLINK_HEAD = YesPlease
-        NEEDS_LIBICONV = YesPlease
-        NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes
-        NO_TRUSTABLE_FILEMODE = UnfortunatelyYes
-        OLD_ICONV = UnfortunatelyYes
-        # There are conflicting reports about this.
-        # On some boxes NO_MMAP is needed, and not so elsewhere.
-        # Try commenting this out if you suspect MMAP is more efficient
-        NO_MMAP = YesPlease
-        NO_IPV6 = YesPlease
-        X = .exe
-endif
-ifeq ($(uname_S),FreeBSD)
-        NEEDS_LIBICONV = YesPlease
-        NO_MEMMEM = YesPlease
-        BASIC_CFLAGS += -I/usr/local/include
-        BASIC_LDFLAGS += -L/usr/local/lib
-        DIR_HAS_BSD_GROUP_SEMANTICS = YesPlease
-        USE_ST_TIMESPEC = YesPlease
-        THREADED_DELTA_SEARCH = YesPlease
-        ifeq ($(shell expr "$(uname_R)" : '4\.'),2)
-                PTHREAD_LIBS = -pthread
-                NO_UINTMAX_T = YesPlease
-                NO_STRTOUMAX = YesPlease
-        endif
-endif
-ifeq ($(uname_S),OpenBSD)
-        NO_STRCASESTR = YesPlease
-        NO_MEMMEM = YesPlease
-        NEEDS_LIBICONV = YesPlease
-        BASIC_CFLAGS += -I/usr/local/include
-        BASIC_LDFLAGS += -L/usr/local/lib
-        THREADED_DELTA_SEARCH = YesPlease
-endif
-ifeq ($(uname_S),NetBSD)
-        ifeq ($(shell expr "$(uname_R)" : '[01]\.'),2)
-                NEEDS_LIBICONV = YesPlease
-        endif
-        BASIC_CFLAGS += -I/usr/pkg/include
-        BASIC_LDFLAGS += -L/usr/pkg/lib $(CC_LD_DYNPATH)/usr/pkg/lib
-        THREADED_DELTA_SEARCH = YesPlease
-endif
-ifeq ($(uname_S),AIX)
-        NO_STRCASESTR=YesPlease
-        NO_MEMMEM = YesPlease
-        NO_MKDTEMP = YesPlease
-        NO_STRLCPY = YesPlease
-        NO_NSEC = YesPlease
-        FREAD_READS_DIRECTORIES = UnfortunatelyYes
-        INTERNAL_QSORT = UnfortunatelyYes
-        NEEDS_LIBICONV=YesPlease
-        BASIC_CFLAGS += -D_LARGE_FILES
-        ifneq ($(shell expr "$(uname_V)" : '[1234]'),1)
-                THREADED_DELTA_SEARCH = YesPlease
-        else
-                NO_PTHREADS = YesPlease
-        endif
-endif
-ifeq ($(uname_S),GNU)
-        # GNU/Hurd
-        NO_STRLCPY=YesPlease
-endif
-ifeq ($(uname_S),IRIX64)
-        NO_IPV6=YesPlease
-        NO_SETENV=YesPlease
-        NO_STRCASESTR=YesPlease
-        NO_MEMMEM = YesPlease
-        NO_STRLCPY = YesPlease
-        NO_SOCKADDR_STORAGE=YesPlease
-        SHELL_PATH=/usr/gnu/bin/bash
-        BASIC_CFLAGS += -DPATH_MAX=1024
-        # for now, build 32-bit version
-        BASIC_LDFLAGS += -L/usr/lib32
-endif
-ifeq ($(uname_S),HP-UX)
-        NO_IPV6=YesPlease
-        NO_SETENV=YesPlease
-        NO_STRCASESTR=YesPlease
-        NO_MEMMEM = YesPlease
-        NO_STRLCPY = YesPlease
-        NO_MKDTEMP = YesPlease
-        NO_UNSETENV = YesPlease
-        NO_HSTRERROR = YesPlease
-        NO_SYS_SELECT_H = YesPlease
-        SNPRINTF_RETURNS_BOGUS = YesPlease
-endif
-ifneq (,$(findstring CYGWIN,$(uname_S)))
-        COMPAT_OBJS += compat/cygwin.o
-endif
-ifneq (,$(findstring MINGW,$(uname_S)))
-        NO_PREAD = YesPlease
-        NO_OPENSSL = YesPlease
-        NO_CURL = YesPlease
-        NO_SYMLINK_HEAD = YesPlease
-        NO_IPV6 = YesPlease
-        NO_SETENV = YesPlease
-        NO_UNSETENV = YesPlease
-        NO_STRCASESTR = YesPlease
-        NO_STRLCPY = YesPlease
-        NO_MEMMEM = YesPlease
-        NO_PTHREADS = YesPlease
-        NEEDS_LIBICONV = YesPlease
-        OLD_ICONV = YesPlease
-        NO_C99_FORMAT = YesPlease
-        NO_STRTOUMAX = YesPlease
-        NO_MKDTEMP = YesPlease
-        SNPRINTF_RETURNS_BOGUS = YesPlease
-        NO_SVN_TESTS = YesPlease
-        NO_PERL_MAKEMAKER = YesPlease
-        RUNTIME_PREFIX = YesPlease
-        NO_POSIX_ONLY_PROGRAMS = YesPlease
-        NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
-        NO_NSEC = YesPlease
-        USE_WIN32_MMAP = YesPlease
-        COMPAT_CFLAGS += -D__USE_MINGW_ACCESS -DNOGDI -Icompat -Icompat/regex -Icompat/fnmatch
-        COMPAT_CFLAGS += -DSNPRINTF_SIZE_CORR=1
-        COMPAT_CFLAGS += -DSTRIP_EXTENSION=\".exe\"
-        COMPAT_OBJS += compat/mingw.o compat/fnmatch/fnmatch.o compat/regex/regex.o compat/winansi.o
-        EXTLIBS += -lws2_32
-        X = .exe
-endif
-ifneq (,$(findstring arm,$(uname_M)))
-        ARM_SHA1 = YesPlease
-endif
-
 -include config.mak.autogen
 -include config.mak
 
@@ -869,72 +365,12 @@ ifndef CC_LD_DYNPATH
         endif
 endif
 
-ifdef NO_CURL
-        BASIC_CFLAGS += -DNO_CURL
-else
-        ifdef CURLDIR
-                # Try "-Wl,-rpath=$(CURLDIR)/$(lib)" in such a case.
-                BASIC_CFLAGS += -I$(CURLDIR)/include
-                CURL_LIBCURL = -L$(CURLDIR)/$(lib) $(CC_LD_DYNPATH)$(CURLDIR)/$(lib) -lcurl
-        else
-                CURL_LIBCURL = -lcurl
-        endif
-        BUILTIN_OBJS += builtin-http-fetch.o
-        EXTLIBS += $(CURL_LIBCURL)
-        LIB_OBJS += http.o http-walker.o
-        curl_check := $(shell (echo 070908; curl-config --vernum) | sort -r | sed -ne 2p)
-        ifeq "$(curl_check)" "070908"
-                ifndef NO_EXPAT
-                        PROGRAMS += git-http-push$X
-                endif
-        endif
-        ifndef NO_EXPAT
-                ifdef EXPATDIR
-                        BASIC_CFLAGS += -I$(EXPATDIR)/include
-                        EXPAT_LIBEXPAT = -L$(EXPATDIR)/$(lib) $(CC_LD_DYNPATH)$(EXPATDIR)/$(lib) -lexpat
-                else
-                        EXPAT_LIBEXPAT = -lexpat
-                endif
-        endif
-endif
-
 ifdef ZLIB_PATH
         BASIC_CFLAGS += -I$(ZLIB_PATH)/include
         EXTLIBS += -L$(ZLIB_PATH)/$(lib) $(CC_LD_DYNPATH)$(ZLIB_PATH)/$(lib)
 endif
 EXTLIBS += -lz
 
-ifndef NO_POSIX_ONLY_PROGRAMS
-        PROGRAMS += git-daemon$X
-        PROGRAMS += git-imap-send$X
-endif
-ifndef NO_OPENSSL
-        OPENSSL_LIBSSL = -lssl
-        ifdef OPENSSLDIR
-                BASIC_CFLAGS += -I$(OPENSSLDIR)/include
-                OPENSSL_LINK = -L$(OPENSSLDIR)/$(lib) $(CC_LD_DYNPATH)$(OPENSSLDIR)/$(lib)
-        else
-                OPENSSL_LINK =
-        endif
-else
-        BASIC_CFLAGS += -DNO_OPENSSL
-        MOZILLA_SHA1 = 1
-        OPENSSL_LIBSSL =
-endif
-ifdef NEEDS_SSL_WITH_CRYPTO
-        LIB_4_CRYPTO = $(OPENSSL_LINK) -lcrypto -lssl
-else
-        LIB_4_CRYPTO = $(OPENSSL_LINK) -lcrypto
-endif
-ifdef NEEDS_LIBICONV
-        ifdef ICONVDIR
-                BASIC_CFLAGS += -I$(ICONVDIR)/include
-                ICONV_LINK = -L$(ICONVDIR)/$(lib) $(CC_LD_DYNPATH)$(ICONVDIR)/$(lib)
-        else
-                ICONV_LINK =
-        endif
-        EXTLIBS += $(ICONV_LINK) -liconv
-endif
 ifdef NEEDS_SOCKET
         EXTLIBS += -lsocket
 endif
@@ -977,10 +413,6 @@ ifdef NO_STRCASESTR
         COMPAT_CFLAGS += -DNO_STRCASESTR
         COMPAT_OBJS += compat/strcasestr.o
 endif
-ifdef NO_STRLCPY
-        COMPAT_CFLAGS += -DNO_STRLCPY
-        COMPAT_OBJS += compat/strlcpy.o
-endif
 ifdef NO_STRTOUMAX
         COMPAT_CFLAGS += -DNO_STRTOUMAX
         COMPAT_OBJS += compat/strtoumax.o
@@ -1090,17 +522,6 @@ ifdef RUNTIME_PREFIX
         COMPAT_CFLAGS += -DRUNTIME_PREFIX
 endif
 
-ifdef NO_PTHREADS
-        THREADED_DELTA_SEARCH =
-        BASIC_CFLAGS += -DNO_PTHREADS
-else
-        EXTLIBS += $(PTHREAD_LIBS)
-endif
-
-ifdef THREADED_DELTA_SEARCH
-        BASIC_CFLAGS += -DTHREADED_DELTA_SEARCH
-        LIB_OBJS += thread-utils.o
-endif
 ifdef DIR_HAS_BSD_GROUP_SEMANTICS
         COMPAT_CFLAGS += -DDIR_HAS_BSD_GROUP_SEMANTICS
 endif
@@ -1148,14 +569,14 @@ endif
 # Shell quote (do not use $(call) to accommodate ancient setups);
 
 SHA1_HEADER_SQ = $(subst ','\'',$(SHA1_HEADER))
-ETC_GITCONFIG_SQ = $(subst ','\'',$(ETC_GITCONFIG))
+ETC_PERFCONFIG_SQ = $(subst ','\'',$(ETC_PERFCONFIG))
 
 DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
 bindir_SQ = $(subst ','\'',$(bindir))
 bindir_relative_SQ = $(subst ','\'',$(bindir_relative))
 mandir_SQ = $(subst ','\'',$(mandir))
 infodir_SQ = $(subst ','\'',$(infodir))
-gitexecdir_SQ = $(subst ','\'',$(gitexecdir))
+perfexecdir_SQ = $(subst ','\'',$(perfexecdir))
 template_dir_SQ = $(subst ','\'',$(template_dir))
 htmldir_SQ = $(subst ','\'',$(htmldir))
 prefix_SQ = $(subst ','\'',$(prefix))
@@ -1164,7 +585,7 @@ SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
 PERL_PATH_SQ = $(subst ','\'',$(PERL_PATH))
 TCLTK_PATH_SQ = $(subst ','\'',$(TCLTK_PATH))
 
-LIBS = $(GITLIBS) $(EXTLIBS)
+LIBS = $(PERFLIBS) $(EXTLIBS)
 
 BASIC_CFLAGS += -DSHA1_HEADER='$(SHA1_HEADER_SQ)' \
         $(COMPAT_CFLAGS)
@@ -1180,15 +601,15 @@ export TAR INSTALL DESTDIR SHELL_PATH
 
 SHELL = $(SHELL_PATH)
 
-all:: shell_compatibility_test $(ALL_PROGRAMS) $(BUILT_INS) $(OTHER_PROGRAMS) GIT-BUILD-OPTIONS
+all:: shell_compatibility_test $(ALL_PROGRAMS) $(BUILT_INS) $(OTHER_PROGRAMS) PERF-BUILD-OPTIONS
 ifneq (,$X)
-        $(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_PROGRAMS) $(BUILT_INS) git$X)), test '$p' -ef '$p$X' || $(RM) '$p';)
+        $(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_PROGRAMS) $(BUILT_INS) perf$X)), test '$p' -ef '$p$X' || $(RM) '$p';)
 endif
 
 all::
 ifndef NO_TCLTK
-        $(QUIET_SUBDIR0)git-gui $(QUIET_SUBDIR1) gitexecdir='$(gitexec_instdir_SQ)' all
-        $(QUIET_SUBDIR0)gitk-git $(QUIET_SUBDIR1) all
+        $(QUIET_SUBDIR0)perf-gui $(QUIET_SUBDIR1) perfexecdir='$(perfexec_instdir_SQ)' all
+        $(QUIET_SUBDIR0)perfk-perf $(QUIET_SUBDIR1) all
 endif
 ifndef NO_PERL
         $(QUIET_SUBDIR0)perl $(QUIET_SUBDIR1) PERL_PATH='$(PERL_PATH_SQ)' prefix='$(prefix_SQ)' all
@@ -1200,33 +621,33 @@ please_set_SHELL_PATH_to_a_more_modern_shell:
 
 shell_compatibility_test: please_set_SHELL_PATH_to_a_more_modern_shell
 
-strip: $(PROGRAMS) git$X
-        $(STRIP) $(STRIP_OPTS) $(PROGRAMS) git$X
+strip: $(PROGRAMS) perf$X
+        $(STRIP) $(STRIP_OPTS) $(PROGRAMS) perf$X
 
-git.o: git.c common-cmds.h GIT-CFLAGS
-        $(QUIET_CC)$(CC) -DGIT_VERSION='"$(GIT_VERSION)"' \
-                '-DGIT_HTML_PATH="$(htmldir_SQ)"' \
+perf.o: perf.c common-cmds.h PERF-CFLAGS
+        $(QUIET_CC)$(CC) -DPERF_VERSION='"$(PERF_VERSION)"' \
+                '-DPERF_HTML_PATH="$(htmldir_SQ)"' \
                 $(ALL_CFLAGS) -c $(filter %.c,$^)
 
-git$X: git.o $(BUILTIN_OBJS) $(GITLIBS)
-        $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ git.o \
+perf$X: perf.o $(BUILTIN_OBJS) $(PERFLIBS)
+        $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ perf.o \
                 $(BUILTIN_OBJS) $(ALL_LDFLAGS) $(LIBS)
 
-builtin-help.o: builtin-help.c common-cmds.h GIT-CFLAGS
+builtin-help.o: builtin-help.c common-cmds.h PERF-CFLAGS
         $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) \
-                '-DGIT_HTML_PATH="$(htmldir_SQ)"' \
-                '-DGIT_MAN_PATH="$(mandir_SQ)"' \
-                '-DGIT_INFO_PATH="$(infodir_SQ)"' $<
+                '-DPERF_HTML_PATH="$(htmldir_SQ)"' \
+                '-DPERF_MAN_PATH="$(mandir_SQ)"' \
+                '-DPERF_INFO_PATH="$(infodir_SQ)"' $<
 
-$(BUILT_INS): git$X
+$(BUILT_INS): perf$X
         $(QUIET_BUILT_IN)$(RM) $@ && \
-        ln git$X $@ 2>/dev/null || \
-        ln -s git$X $@ 2>/dev/null || \
-        cp git$X $@
+        ln perf$X $@ 2>/dev/null || \
+        ln -s perf$X $@ 2>/dev/null || \
+        cp perf$X $@
 
 common-cmds.h: ./generate-cmdlist.sh command-list.txt
 
-common-cmds.h: $(wildcard Documentation/git-*.txt)
+common-cmds.h: $(wildcard Documentation/perf-*.txt)
         $(QUIET_GEN)./generate-cmdlist.sh > $@+ && mv $@+ $@
 
 $(patsubst %.sh,%,$(SCRIPT_SH)) : % : %.sh
@@ -1234,152 +655,55 @@ $(patsubst %.sh,%,$(SCRIPT_SH)) : % : %.sh
         sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
             -e 's|@SHELL_PATH@|$(SHELL_PATH_SQ)|' \
             -e 's|@@PERL@@|$(PERL_PATH_SQ)|g' \
-            -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
+            -e 's/@@PERF_VERSION@@/$(PERF_VERSION)/g' \
             -e 's/@@NO_CURL@@/$(NO_CURL)/g' \
             $@.sh >$@+ && \
         chmod +x $@+ && \
         mv $@+ $@
 
-ifndef NO_PERL
-$(patsubst %.perl,%,$(SCRIPT_PERL)): perl/perl.mak
-
-perl/perl.mak: GIT-CFLAGS perl/Makefile perl/Makefile.PL
-        $(QUIET_SUBDIR0)perl $(QUIET_SUBDIR1) PERL_PATH='$(PERL_PATH_SQ)' prefix='$(prefix_SQ)' $(@F)
-
-$(patsubst %.perl,%,$(SCRIPT_PERL)): % : %.perl
-        $(QUIET_GEN)$(RM) $@ $@+ && \
-        INSTLIBDIR=`MAKEFLAGS= $(MAKE) -C perl -s --no-print-directory instlibdir` && \
-        sed -e '1{' \
-            -e '        s|#!.*perl|#!$(PERL_PATH_SQ)|' \
-            -e '        h' \
-            -e '        s=.*=use lib (split(/:/, $$ENV{GITPERLLIB} || "@@INSTLIBDIR@@"));=' \
-            -e '        H' \
-            -e '        x' \
-            -e '}' \
-            -e 's|@@INSTLIBDIR@@|'"$$INSTLIBDIR"'|g' \
-            -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
-            $@.perl >$@+ && \
-        chmod +x $@+ && \
-        mv $@+ $@
-
-gitweb/gitweb.cgi: gitweb/gitweb.perl
-        $(QUIET_GEN)$(RM) $@ $@+ && \
-        sed -e '1s|#!.*perl|#!$(PERL_PATH_SQ)|' \
-            -e 's|++GIT_VERSION++|$(GIT_VERSION)|g' \
-            -e 's|++GIT_BINDIR++|$(bindir)|g' \
-            -e 's|++GITWEB_CONFIG++|$(GITWEB_CONFIG)|g' \
-            -e 's|++GITWEB_CONFIG_SYSTEM++|$(GITWEB_CONFIG_SYSTEM)|g' \
-            -e 's|++GITWEB_HOME_LINK_STR++|$(GITWEB_HOME_LINK_STR)|g' \
-            -e 's|++GITWEB_SITENAME++|$(GITWEB_SITENAME)|g' \
-            -e 's|++GITWEB_PROJECTROOT++|$(GITWEB_PROJECTROOT)|g' \
-            -e 's|"++GITWEB_PROJECT_MAXDEPTH++"|$(GITWEB_PROJECT_MAXDEPTH)|g' \
-            -e 's|++GITWEB_EXPORT_OK++|$(GITWEB_EXPORT_OK)|g' \
-            -e 's|++GITWEB_STRICT_EXPORT++|$(GITWEB_STRICT_EXPORT)|g' \
-            -e 's|++GITWEB_BASE_URL++|$(GITWEB_BASE_URL)|g' \
-            -e 's|++GITWEB_LIST++|$(GITWEB_LIST)|g' \
-            -e 's|++GITWEB_HOMETEXT++|$(GITWEB_HOMETEXT)|g' \
-            -e 's|++GITWEB_CSS++|$(GITWEB_CSS)|g' \
-            -e 's|++GITWEB_LOGO++|$(GITWEB_LOGO)|g' \
-            -e 's|++GITWEB_FAVICON++|$(GITWEB_FAVICON)|g' \
-            -e 's|++GITWEB_SITE_HEADER++|$(GITWEB_SITE_HEADER)|g' \
-            -e 's|++GITWEB_SITE_FOOTER++|$(GITWEB_SITE_FOOTER)|g' \
-            $< >$@+ && \
-        chmod +x $@+ && \
-        mv $@+ $@
-
-git-instaweb: git-instaweb.sh gitweb/gitweb.cgi gitweb/gitweb.css
-        $(QUIET_GEN)$(RM) $@ $@+ && \
-        sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
-            -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
-            -e 's/@@NO_CURL@@/$(NO_CURL)/g' \
-            -e '/@@GITWEB_CGI@@/r gitweb/gitweb.cgi' \
-            -e '/@@GITWEB_CGI@@/d' \
-            -e '/@@GITWEB_CSS@@/r gitweb/gitweb.css' \
-            -e '/@@GITWEB_CSS@@/d' \
-            -e 's|@@PERL@@|$(PERL_PATH_SQ)|g' \
-            $@.sh > $@+ && \
-        chmod +x $@+ && \
-        mv $@+ $@
-else # NO_PERL
-$(patsubst %.perl,%,$(SCRIPT_PERL)) git-instaweb: % : unimplemented.sh
-        $(QUIET_GEN)$(RM) $@ $@+ && \
-        sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
-            -e 's|@@REASON@@|NO_PERL=$(NO_PERL)|g' \
-            unimplemented.sh >$@+ && \
-        chmod +x $@+ && \
-        mv $@+ $@
-endif # NO_PERL
-
 configure: configure.ac
         $(QUIET_GEN)$(RM) $@ $<+ && \
-        sed -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
+        sed -e 's/@@PERF_VERSION@@/$(PERF_VERSION)/g' \
             $< > $<+ && \
         autoconf -o $@ $<+ && \
         $(RM) $<+
 
-# These can record GIT_VERSION
-git.o git.spec \
+# These can record PERF_VERSION
+perf.o perf.spec \
         $(patsubst %.sh,%,$(SCRIPT_SH)) \
         $(patsubst %.perl,%,$(SCRIPT_PERL)) \
-        : GIT-VERSION-FILE
+        : PERF-VERSION-FILE
 
-%.o: %.c GIT-CFLAGS
+%.o: %.c PERF-CFLAGS
         $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
-%.s: %.c GIT-CFLAGS
+%.s: %.c PERF-CFLAGS
         $(QUIET_CC)$(CC) -S $(ALL_CFLAGS) $<
 %.o: %.S
         $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
 
-exec_cmd.o: exec_cmd.c GIT-CFLAGS
+exec_cmd.o: exec_cmd.c PERF-CFLAGS
         $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) \
-                '-DGIT_EXEC_PATH="$(gitexecdir_SQ)"' \
+                '-DPERF_EXEC_PATH="$(perfexecdir_SQ)"' \
                 '-DBINDIR="$(bindir_relative_SQ)"' \
                 '-DPREFIX="$(prefix_SQ)"' \
                 $<
 
-builtin-init-db.o: builtin-init-db.c GIT-CFLAGS
-        $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) -DDEFAULT_GIT_TEMPLATE_DIR='"$(template_dir_SQ)"' $<
-
-config.o: config.c GIT-CFLAGS
-        $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) -DETC_GITCONFIG='"$(ETC_GITCONFIG_SQ)"' $<
+builtin-init-db.o: builtin-init-db.c PERF-CFLAGS
+        $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) -DDEFAULT_PERF_TEMPLATE_DIR='"$(template_dir_SQ)"' $<
 
-http.o: http.c GIT-CFLAGS
-        $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) -DGIT_USER_AGENT='"git/$(GIT_VERSION)"' $<
+config.o: config.c PERF-CFLAGS
+        $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) -DETC_PERFCONFIG='"$(ETC_PERFCONFIG_SQ)"' $<
 
-ifdef NO_EXPAT
-http-walker.o: http-walker.c http.h GIT-CFLAGS
-        $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) -DNO_EXPAT $<
-endif
-
-git-%$X: %.o $(GITLIBS)
+perf-%$X: %.o $(PERFLIBS)
         $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
 
-git-imap-send$X: imap-send.o $(GITLIBS)
-        $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
-                $(LIBS) $(OPENSSL_LINK) $(OPENSSL_LIBSSL)
-
-http.o http-walker.o http-push.o transport.o: http.h
-
-git-http-push$X: revision.o http.o http-push.o $(GITLIBS)
-        $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
-                $(LIBS) $(CURL_LIBCURL) $(EXPAT_LIBEXPAT)
-
 $(LIB_OBJS) $(BUILTIN_OBJS): $(LIB_H)
-$(patsubst git-%$X,%.o,$(PROGRAMS)): $(LIB_H) $(wildcard */*.h)
+$(patsubst perf-%$X,%.o,$(PROGRAMS)): $(LIB_H) $(wildcard */*.h)
 builtin-revert.o wt-status.o: wt-status.h
 
 $(LIB_FILE): $(LIB_OBJS)
         $(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIB_OBJS)
 
-XDIFF_OBJS=xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o \
-        xdiff/xmerge.o xdiff/xpatience.o
-$(XDIFF_OBJS): xdiff/xinclude.h xdiff/xmacros.h xdiff/xdiff.h xdiff/xtypes.h \
-        xdiff/xutils.h xdiff/xprepare.h xdiff/xdiffi.h xdiff/xemit.h
-
-$(XDIFF_LIB): $(XDIFF_OBJS)
-        $(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(XDIFF_OBJS)
-
-
 doc:
         $(MAKE) -C Documentation all
 
@@ -1409,19 +733,19 @@ cscope:
 
 ### Detect prefix changes
 TRACK_CFLAGS = $(subst ','\'',$(ALL_CFLAGS)):\
-             $(bindir_SQ):$(gitexecdir_SQ):$(template_dir_SQ):$(prefix_SQ)
+             $(bindir_SQ):$(perfexecdir_SQ):$(template_dir_SQ):$(prefix_SQ)
 
-GIT-CFLAGS: .FORCE-GIT-CFLAGS
+PERF-CFLAGS: .FORCE-PERF-CFLAGS
         @FLAGS='$(TRACK_CFLAGS)'; \
-            if test x"$$FLAGS" != x"`cat GIT-CFLAGS 2>/dev/null`" ; then \
+            if test x"$$FLAGS" != x"`cat PERF-CFLAGS 2>/dev/null`" ; then \
                 echo 1>&2 "    * new build flags or prefix"; \
-                echo "$$FLAGS" >GIT-CFLAGS; \
+                echo "$$FLAGS" >PERF-CFLAGS; \
             fi
 
 # We need to apply sq twice, once to protect from the shell
-# that runs GIT-BUILD-OPTIONS, and then again to protect it
+# that runs PERF-BUILD-OPTIONS, and then again to protect it
 # and the first level quoting from the shell that runs "echo".
-GIT-BUILD-OPTIONS: .FORCE-GIT-BUILD-OPTIONS
+PERF-BUILD-OPTIONS: .FORCE-PERF-BUILD-OPTIONS
         @echo SHELL_PATH=\''$(subst ','\'',$(SHELL_PATH_SQ))'\' >$@
         @echo TAR=\''$(subst ','\'',$(subst ','\'',$(TAR)))'\' >>$@
         @echo NO_CURL=\''$(subst ','\'',$(subst ','\'',$(NO_CURL)))'\' >>$@
@@ -1431,14 +755,14 @@ GIT-BUILD-OPTIONS: .FORCE-GIT-BUILD-OPTIONS
 ifndef NO_TCLTK
 TRACK_VARS = $(subst ','\'',-DTCLTK_PATH='$(TCLTK_PATH_SQ)')
 
-GIT-GUI-VARS: .FORCE-GIT-GUI-VARS
+PERF-GUI-VARS: .FORCE-PERF-GUI-VARS
         @VARS='$(TRACK_VARS)'; \
             if test x"$$VARS" != x"`cat $@ 2>/dev/null`" ; then \
                 echo 1>&2 "    * new Tcl/Tk interpreter location"; \
                 echo "$$VARS" >$@; \
             fi
 
-.PHONY: .FORCE-GIT-GUI-VARS
+.PHONY: .FORCE-PERF-GUI-VARS
 endif
 
 ### Testing rules
@@ -1476,7 +800,7 @@ test-parse-options$X: parse-options.o
 
 .PRECIOUS: $(patsubst test-%$X,test-%.o,$(TEST_PROGRAMS))
 
-test-%$X: test-%.o $(GITLIBS)
+test-%$X: test-%.o $(PERFLIBS)
         $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
 
 check-sha1:: test-sha1$X
@@ -1506,40 +830,40 @@ template_instdir = $(prefix)/$(template_dir)
 endif
 export template_instdir
 
-ifneq ($(filter /%,$(firstword $(gitexecdir))),)
-gitexec_instdir = $(gitexecdir)
+ifneq ($(filter /%,$(firstword $(perfexecdir))),)
+perfexec_instdir = $(perfexecdir)
 else
-gitexec_instdir = $(prefix)/$(gitexecdir)
+perfexec_instdir = $(prefix)/$(perfexecdir)
 endif
-gitexec_instdir_SQ = $(subst ','\'',$(gitexec_instdir))
-export gitexec_instdir
+perfexec_instdir_SQ = $(subst ','\'',$(perfexec_instdir))
+export perfexec_instdir
 
 install: all
         $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(bindir_SQ)'
-        $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-        $(INSTALL) $(ALL_PROGRAMS) '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-        $(INSTALL) git$X git-upload-pack$X git-receive-pack$X git-upload-archive$X git-shell$X git-cvsserver '$(DESTDIR_SQ)$(bindir_SQ)'
+        $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
+        $(INSTALL) $(ALL_PROGRAMS) '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
+        $(INSTALL) perf$X perf-upload-pack$X perf-receive-pack$X perf-upload-archive$X perf-shell$X perf-cvsserver '$(DESTDIR_SQ)$(bindir_SQ)'
         $(MAKE) -C templates DESTDIR='$(DESTDIR_SQ)' install
         $(MAKE) -C perl prefix='$(prefix_SQ)' DESTDIR='$(DESTDIR_SQ)' install
 ifndef NO_TCLTK
-        $(MAKE) -C gitk-git install
-        $(MAKE) -C git-gui gitexecdir='$(gitexec_instdir_SQ)' install
+        $(MAKE) -C perfk-perf install
+        $(MAKE) -C perf-gui perfexecdir='$(perfexec_instdir_SQ)' install
 endif
 ifneq (,$X)
-        $(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_PROGRAMS) $(BUILT_INS) git$X)), $(RM) '$(DESTDIR_SQ)$(gitexec_instdir_SQ)/$p';)
+        $(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_PROGRAMS) $(BUILT_INS) perf$X)), $(RM) '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/$p';)
 endif
         bindir=$$(cd '$(DESTDIR_SQ)$(bindir_SQ)' && pwd) && \
-        execdir=$$(cd '$(DESTDIR_SQ)$(gitexec_instdir_SQ)' && pwd) && \
-        { $(RM) "$$execdir/git-add$X" && \
-                ln "$$bindir/git$X" "$$execdir/git-add$X" 2>/dev/null || \
-                cp "$$bindir/git$X" "$$execdir/git-add$X"; } && \
-        { for p in $(filter-out git-add$X,$(BUILT_INS)); do \
+        execdir=$$(cd '$(DESTDIR_SQ)$(perfexec_instdir_SQ)' && pwd) && \
+        { $(RM) "$$execdir/perf-add$X" && \
+                ln "$$bindir/perf$X" "$$execdir/perf-add$X" 2>/dev/null || \
+                cp "$$bindir/perf$X" "$$execdir/perf-add$X"; } && \
+        { for p in $(filter-out perf-add$X,$(BUILT_INS)); do \
                 $(RM) "$$execdir/$$p" && \
-                ln "$$execdir/git-add$X" "$$execdir/$$p" 2>/dev/null || \
-                ln -s "git-add$X" "$$execdir/$$p" 2>/dev/null || \
-                cp "$$execdir/git-add$X" "$$execdir/$$p" || exit; \
+                ln "$$execdir/perf-add$X" "$$execdir/$$p" 2>/dev/null || \
+                ln -s "perf-add$X" "$$execdir/$$p" 2>/dev/null || \
+                cp "$$execdir/perf-add$X" "$$execdir/$$p" || exit; \
           done } && \
-        ./check_bindir "z$$bindir" "z$$execdir" "$$bindir/git-add$X"
+        ./check_bindir "z$$bindir" "z$$execdir" "$$bindir/perf-add$X"
 
 install-doc:
         $(MAKE) -C Documentation install
@@ -1569,31 +893,31 @@ quick-install-html:
 
 ### Maintainer's dist rules
 
-git.spec: git.spec.in
-        sed -e 's/@@VERSION@@/$(GIT_VERSION)/g' < $< > $@+
+perf.spec: perf.spec.in
+        sed -e 's/@@VERSION@@/$(PERF_VERSION)/g' < $< > $@+
         mv $@+ $@
 
-GIT_TARNAME=git-$(GIT_VERSION)
-dist: git.spec git-archive$(X) configure
-        ./git-archive --format=tar \
-                --prefix=$(GIT_TARNAME)/ HEAD^{tree} > $(GIT_TARNAME).tar
-        @mkdir -p $(GIT_TARNAME)
-        @cp git.spec configure $(GIT_TARNAME)
-        @echo $(GIT_VERSION) > $(GIT_TARNAME)/version
-        @$(MAKE) -C git-gui TARDIR=../$(GIT_TARNAME)/git-gui dist-version
-        $(TAR) rf $(GIT_TARNAME).tar \
-                $(GIT_TARNAME)/git.spec \
-                $(GIT_TARNAME)/configure \
-                $(GIT_TARNAME)/version \
-                $(GIT_TARNAME)/git-gui/version
-        @$(RM) -r $(GIT_TARNAME)
-        gzip -f -9 $(GIT_TARNAME).tar
+PERF_TARNAME=perf-$(PERF_VERSION)
+dist: perf.spec perf-archive$(X) configure
+        ./perf-archive --format=tar \
+                --prefix=$(PERF_TARNAME)/ HEAD^{tree} > $(PERF_TARNAME).tar
+        @mkdir -p $(PERF_TARNAME)
+        @cp perf.spec configure $(PERF_TARNAME)
+        @echo $(PERF_VERSION) > $(PERF_TARNAME)/version
+        @$(MAKE) -C perf-gui TARDIR=../$(PERF_TARNAME)/perf-gui dist-version
+        $(TAR) rf $(PERF_TARNAME).tar \
+                $(PERF_TARNAME)/perf.spec \
+                $(PERF_TARNAME)/configure \
+                $(PERF_TARNAME)/version \
+                $(PERF_TARNAME)/perf-gui/version
+        @$(RM) -r $(PERF_TARNAME)
+        gzip -f -9 $(PERF_TARNAME).tar
 
 rpm: dist
-        $(RPMBUILD) -ta $(GIT_TARNAME).tar.gz
+        $(RPMBUILD) -ta $(PERF_TARNAME).tar.gz
 
-htmldocs = git-htmldocs-$(GIT_VERSION)
-manpages = git-manpages-$(GIT_VERSION)
+htmldocs = perf-htmldocs-$(PERF_VERSION)
+manpages = perf-manpages-$(PERF_VERSION)
 dist-doc:
         $(RM) -r .doc-tmp-dir
         mkdir .doc-tmp-dir
@@ -1618,51 +942,46 @@ distclean: clean
         $(RM) configure
 
 clean:
-        $(RM) *.o mozilla-sha1/*.o arm/*.o ppc/*.o compat/*.o xdiff/*.o \
-                $(LIB_FILE) $(XDIFF_LIB)
-        $(RM) $(ALL_PROGRAMS) $(BUILT_INS) git$X
+        $(RM) *.o $(LIB_FILE)
+        $(RM) $(ALL_PROGRAMS) $(BUILT_INS) perf$X
         $(RM) $(TEST_PROGRAMS)
         $(RM) *.spec *.pyc *.pyo */*.pyc */*.pyo common-cmds.h TAGS tags cscope*
         $(RM) -r autom4te.cache
         $(RM) config.log config.mak.autogen config.mak.append config.status config.cache
-        $(RM) -r $(GIT_TARNAME) .doc-tmp-dir
-        $(RM) $(GIT_TARNAME).tar.gz git-core_$(GIT_VERSION)-*.tar.gz
+        $(RM) -r $(PERF_TARNAME) .doc-tmp-dir
+        $(RM) $(PERF_TARNAME).tar.gz perf-core_$(PERF_VERSION)-*.tar.gz
         $(RM) $(htmldocs).tar.gz $(manpages).tar.gz
         $(MAKE) -C Documentation/ clean
-ifndef NO_PERL
-        $(RM) gitweb/gitweb.cgi
-        $(MAKE) -C perl clean
-endif
         $(MAKE) -C templates/ clean
         $(MAKE) -C t/ clean
 ifndef NO_TCLTK
-        $(MAKE) -C gitk-git clean
-        $(MAKE) -C git-gui clean
+        $(MAKE) -C perfk-perf clean
+        $(MAKE) -C perf-gui clean
 endif
-        $(RM) GIT-VERSION-FILE GIT-CFLAGS GIT-GUI-VARS GIT-BUILD-OPTIONS
+        $(RM) PERF-VERSION-FILE PERF-CFLAGS PERF-GUI-VARS PERF-BUILD-OPTIONS
 
 .PHONY: all install clean strip
 .PHONY: shell_compatibility_test please_set_SHELL_PATH_to_a_more_modern_shell
-.PHONY: .FORCE-GIT-VERSION-FILE TAGS tags cscope .FORCE-GIT-CFLAGS
-.PHONY: .FORCE-GIT-BUILD-OPTIONS
+.PHONY: .FORCE-PERF-VERSION-FILE TAGS tags cscope .FORCE-PERF-CFLAGS
+.PHONY: .FORCE-PERF-BUILD-OPTIONS
 
 ### Check documentation
 #
 check-docs::
-        @(for v in $(ALL_PROGRAMS) $(BUILT_INS) git gitk; \
+        @(for v in $(ALL_PROGRAMS) $(BUILT_INS) perf perfk; \
         do \
                 case "$$v" in \
-                git-merge-octopus | git-merge-ours | git-merge-recursive | \
-                git-merge-resolve | git-merge-subtree | \
-                git-fsck-objects | git-init-db | \
-                git-?*--?* ) continue ;; \
+                perf-merge-octopus | perf-merge-ours | perf-merge-recursive | \
+                perf-merge-resolve | perf-merge-subtree | \
+                perf-fsck-objects | perf-init-db | \
+                perf-?*--?* ) continue ;; \
                 esac ; \
                 test -f "Documentation/$$v.txt" || \
                 echo "no doc: $$v"; \
                 sed -e '/^#/d' command-list.txt | \
                 grep -q "^$$v[  ]" || \
                 case "$$v" in \
-                git) ;; \
+                perf) ;; \
                 *) echo "no link: $$v";; \
                 esac ; \
         done; \
@@ -1670,37 +989,37 @@ check-docs::
                 sed -e '/^#/d' \
                     -e 's/[     ].*//' \
                     -e 's/^/listed /' command-list.txt; \
-                ls -1 Documentation/git*txt | \
+                ls -1 Documentation/perf*txt | \
                 sed -e 's|Documentation/|documented |' \
                     -e 's/\.txt//'; \
         ) | while read how cmd; \
         do \
                 case "$$how,$$cmd" in \
-                *,git-citool | \
-                *,git-gui | \
-                *,git-help | \
-                documented,gitattributes | \
-                documented,gitignore | \
-                documented,gitmodules | \
-                documented,gitcli | \
-                documented,git-tools | \
-                documented,gitcore-tutorial | \
-                documented,gitcvs-migration | \
-                documented,gitdiffcore | \
-                documented,gitglossary | \
-                documented,githooks | \
-                documented,gitrepository-layout | \
-                documented,gittutorial | \
-                documented,gittutorial-2 | \
+                *,perf-citool | \
+                *,perf-gui | \
+                *,perf-help | \
+                documented,perfattributes | \
+                documented,perfignore | \
+                documented,perfmodules | \
+                documented,perfcli | \
+                documented,perf-tools | \
+                documented,perfcore-tutorial | \
+                documented,perfcvs-migration | \
+                documented,perfdiffcore | \
+                documented,perfglossary | \
+                documented,perfhooks | \
+                documented,perfrepository-layout | \
+                documented,perftutorial | \
+                documented,perftutorial-2 | \
                 sentinel,not,matching,is,ok ) continue ;; \
                 esac; \
-                case " $(ALL_PROGRAMS) $(BUILT_INS) git gitk " in \
+                case " $(ALL_PROGRAMS) $(BUILT_INS) perf perfk " in \
                 *" $$cmd "*)    ;; \
                 *) echo "removed but $$how: $$cmd" ;; \
                 esac; \
         done ) | sort
 
-### Make sure built-ins do not have dups and listed in git.c
+### Make sure built-ins do not have dups and listed in perf.c
 #
 check-builtins::
         ./check-builtins.sh
diff --git a/Documentation/perf_counter/PERF-BUILD-OPTIONS b/Documentation/perf_counter/PERF-BUILD-OPTIONS
new file mode 100644
index 000000000000..46d8d6ceb2f4
--- /dev/null
+++ b/Documentation/perf_counter/PERF-BUILD-OPTIONS
@@ -0,0 +1,4 @@
+SHELL_PATH='/bin/sh'
+TAR='tar'
+NO_CURL=''
+NO_PERL=''
diff --git a/Documentation/perf_counter/PERF-CFLAGS b/Documentation/perf_counter/PERF-CFLAGS
new file mode 100644
index 000000000000..f24906ca688d
--- /dev/null
+++ b/Documentation/perf_counter/PERF-CFLAGS
@@ -0,0 +1 @@
+-g -O2 -Wall  -DSHA1_HEADER='<openssl/sha.h>' : /home/mingo/bin:libexec/perf-core:share/perf-core/templates:/home/mingo
diff --git a/Documentation/perf_counter/PERF-VERSION-FILE b/Documentation/perf_counter/PERF-VERSION-FILE
new file mode 100644
index 000000000000..328e244c0c81
--- /dev/null
+++ b/Documentation/perf_counter/PERF-VERSION-FILE
@@ -0,0 +1 @@
+PERF_VERSION = 0.0.1.PERF
diff --git a/Documentation/perf_counter/PERF-VERSION-GEN b/Documentation/perf_counter/PERF-VERSION-GEN
new file mode 100755
index 000000000000..c561d1538c03
--- /dev/null
+++ b/Documentation/perf_counter/PERF-VERSION-GEN
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+GVF=PERF-VERSION-FILE
+DEF_VER=v0.0.1.PERF
+
+LF='
+'
+
+# First see if there is a version file (included in release tarballs),
+# then try git-describe, then default.
+if test -f version
+then
+        VN=$(cat version) || VN="$DEF_VER"
+elif test -d .git -o -f .git &&
+        VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
+        case "$VN" in
+        *$LF*) (exit 1) ;;
+        v[0-9]*)
+                git update-index -q --refresh
+                test -z "$(git diff-index --name-only HEAD --)" ||
+                VN="$VN-dirty" ;;
+        esac
+then
+        VN=$(echo "$VN" | sed -e 's/-/./g');
+else
+        VN="$DEF_VER"
+fi
+
+VN=$(expr "$VN" : v*'\(.*\)')
+
+if test -r $GVF
+then
+        VC=$(sed -e 's/^PERF_VERSION = //' <$GVF)
+else
+        VC=unset
+fi
+test "$VN" = "$VC" || {
+        echo >&2 "PERF_VERSION = $VN"
+        echo "PERF_VERSION = $VN" >$GVF
+}
+
+
diff --git a/Documentation/perf_counter/abspath.c b/Documentation/perf_counter/abspath.c
new file mode 100644
index 000000000000..649f34f83365
--- /dev/null
+++ b/Documentation/perf_counter/abspath.c
@@ -0,0 +1,117 @@
+#include "cache.h"
+
+/*
+ * Do not use this for inspecting *tracked* content.  When path is a
+ * symlink to a directory, we do not want to say it is a directory when
+ * dealing with tracked content in the working tree.
+ */
+int is_directory(const char *path)
+{
+        struct stat st;
+        return (!stat(path, &st) && S_ISDIR(st.st_mode));
+}
+
+/* We allow "recursive" symbolic links. Only within reason, though. */
+#define MAXDEPTH 5
+
+const char *make_absolute_path(const char *path)
+{
+        static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
+        char cwd[1024] = "";
+        int buf_index = 1, len;
+
+        int depth = MAXDEPTH;
+        char *last_elem = NULL;
+        struct stat st;
+
+        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
+                die ("Too long path: %.*s", 60, path);
+
+        while (depth--) {
+                if (!is_directory(buf)) {
+                        char *last_slash = strrchr(buf, '/');
+                        if (last_slash) {
+                                *last_slash = '\0';
+                                last_elem = xstrdup(last_slash + 1);
+                        } else {
+                                last_elem = xstrdup(buf);
+                                *buf = '\0';
+                        }
+                }
+
+                if (*buf) {
+                        if (!*cwd && !getcwd(cwd, sizeof(cwd)))
+                                die ("Could not get current working directory");
+
+                        if (chdir(buf))
+                                die ("Could not switch to '%s'", buf);
+                }
+                if (!getcwd(buf, PATH_MAX))
+                        die ("Could not get current working directory");
+
+                if (last_elem) {
+                        int len = strlen(buf);
+                        if (len + strlen(last_elem) + 2 > PATH_MAX)
+                                die ("Too long path name: '%s/%s'",
+                                                buf, last_elem);
+                        buf[len] = '/';
+                        strcpy(buf + len + 1, last_elem);
+                        free(last_elem);
+                        last_elem = NULL;
+                }
+
+                if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
+                        len = readlink(buf, next_buf, PATH_MAX);
+                        if (len < 0)
+                                die ("Invalid symlink: %s", buf);
+                        if (PATH_MAX <= len)
+                                die("symbolic link too long: %s", buf);
+                        next_buf[len] = '\0';
+                        buf = next_buf;
+                        buf_index = 1 - buf_index;
+                        next_buf = bufs[buf_index];
+                } else
+                        break;
+        }
+
+        if (*cwd && chdir(cwd))
+                die ("Could not change back to '%s'", cwd);
+
+        return buf;
+}
+
+static const char *get_pwd_cwd(void)
+{
+        static char cwd[PATH_MAX + 1];
+        char *pwd;
+        struct stat cwd_stat, pwd_stat;
+        if (getcwd(cwd, PATH_MAX) == NULL)
+                return NULL;
+        pwd = getenv("PWD");
+        if (pwd && strcmp(pwd, cwd)) {
+                stat(cwd, &cwd_stat);
+                if (!stat(pwd, &pwd_stat) &&
+                    pwd_stat.st_dev == cwd_stat.st_dev &&
+                    pwd_stat.st_ino == cwd_stat.st_ino) {
+                        strlcpy(cwd, pwd, PATH_MAX);
+                }
+        }
+        return cwd;
+}
+
+const char *make_nonrelative_path(const char *path)
+{
+        static char buf[PATH_MAX + 1];
+
+        if (is_absolute_path(path)) {
+                if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
+                        die("Too long path: %.*s", 60, path);
+        } else {
+                const char *cwd = get_pwd_cwd();
+                if (!cwd)
+                        die("Cannot determine the current working directory");
+                if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
+                        die("Too long path: %.*s", 60, path);
+        }
+        return buf;
+}
diff --git a/Documentation/perf_counter/alias.c b/Documentation/perf_counter/alias.c
new file mode 100644
index 000000000000..9b3dd2b428df
--- /dev/null
+++ b/Documentation/perf_counter/alias.c
@@ -0,0 +1,77 @@
+#include "cache.h"
+
+static const char *alias_key;
+static char *alias_val;
+
+static int alias_lookup_cb(const char *k, const char *v, void *cb)
+{
+        if (!prefixcmp(k, "alias.") && !strcmp(k+6, alias_key)) {
+                if (!v)
+                        return config_error_nonbool(k);
+                alias_val = strdup(v);
+                return 0;
+        }
+        return 0;
+}
+
+char *alias_lookup(const char *alias)
+{
+        alias_key = alias;
+        alias_val = NULL;
+        perf_config(alias_lookup_cb, NULL);
+        return alias_val;
+}
+
+int split_cmdline(char *cmdline, const char ***argv)
+{
+        int src, dst, count = 0, size = 16;
+        char quoted = 0;
+
+        *argv = malloc(sizeof(char*) * size);
+
+        /* split alias_string */
+        (*argv)[count++] = cmdline;
+        for (src = dst = 0; cmdline[src];) {
+                char c = cmdline[src];
+                if (!quoted && isspace(c)) {
+                        cmdline[dst++] = 0;
+                        while (cmdline[++src]
+                                        && isspace(cmdline[src]))
+                                ; /* skip */
+                        if (count >= size) {
+                                size += 16;
+                                *argv = realloc(*argv, sizeof(char*) * size);
+                        }
+                        (*argv)[count++] = cmdline + dst;
+                } else if (!quoted && (c == '\'' || c == '"')) {
+                        quoted = c;
+                        src++;
+                } else if (c == quoted) {
+                        quoted = 0;
+                        src++;
+                } else {
+                        if (c == '\\' && quoted != '\'') {
+                                src++;
+                                c = cmdline[src];
+                                if (!c) {
+                                        free(*argv);
+                                        *argv = NULL;
+                                        return error("cmdline ends with \\");
+                                }
+                        }
+                        cmdline[dst++] = c;
+                        src++;
+                }
+        }
+
+        cmdline[dst] = 0;
+
+        if (quoted) {
+                free(*argv);
+                *argv = NULL;
+                return error("unclosed quote");
+        }
+
+        return count;
+}
+
diff --git a/Documentation/perf_counter/builtin-help.c b/Documentation/perf_counter/builtin-help.c
new file mode 100644
index 000000000000..125fcc2f4901
--- /dev/null
+++ b/Documentation/perf_counter/builtin-help.c
@@ -0,0 +1,463 @@
+/*
+ * builtin-help.c
+ *
+ * Builtin help command
+ */
+#include "cache.h"
+#include "builtin.h"
+#include "exec_cmd.h"
+#include "common-cmds.h"
+#include "parse-options.h"
+#include "run-command.h"
+#include "help.h"
+
+static struct man_viewer_list {
+        struct man_viewer_list *next;
+        char name[FLEX_ARRAY];
+} *man_viewer_list;
+
+static struct man_viewer_info_list {
+        struct man_viewer_info_list *next;
+        const char *info;
+        char name[FLEX_ARRAY];
+} *man_viewer_info_list;
+
+enum help_format {
+        HELP_FORMAT_MAN,
+        HELP_FORMAT_INFO,
+        HELP_FORMAT_WEB,
+};
+
+static int show_all = 0;
+static enum help_format help_format = HELP_FORMAT_MAN;
+static struct option builtin_help_options[] = {
+        OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
+        OPT_SET_INT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
+        OPT_SET_INT('w', "web", &help_format, "show manual in web browser",
+                        HELP_FORMAT_WEB),
+        OPT_SET_INT('i', "info", &help_format, "show info page",
+                        HELP_FORMAT_INFO),
+        OPT_END(),
+};
+
+static const char * const builtin_help_usage[] = {
+        "perf help [--all] [--man|--web|--info] [command]",
+        NULL
+};
+
+static enum help_format parse_help_format(const char *format)
+{
+        if (!strcmp(format, "man"))
+                return HELP_FORMAT_MAN;
+        if (!strcmp(format, "info"))
+                return HELP_FORMAT_INFO;
+        if (!strcmp(format, "web") || !strcmp(format, "html"))
+                return HELP_FORMAT_WEB;
+        die("unrecognized help format '%s'", format);
+}
+
+static const char *get_man_viewer_info(const char *name)
+{
+        struct man_viewer_info_list *viewer;
+
+        for (viewer = man_viewer_info_list; viewer; viewer = viewer->next)
+        {
+                if (!strcasecmp(name, viewer->name))
+                        return viewer->info;
+        }
+        return NULL;
+}
+
+static int check_emacsclient_version(void)
+{
+        struct strbuf buffer = STRBUF_INIT;
+        struct child_process ec_process;
+        const char *argv_ec[] = { "emacsclient", "--version", NULL };
+        int version;
+
+        /* emacsclient prints its version number on stderr */
+        memset(&ec_process, 0, sizeof(ec_process));
+        ec_process.argv = argv_ec;
+        ec_process.err = -1;
+        ec_process.stdout_to_stderr = 1;
+        if (start_command(&ec_process)) {
+                fprintf(stderr, "Failed to start emacsclient.\n");
+                return -1;
+        }
+        strbuf_read(&buffer, ec_process.err, 20);
+        close(ec_process.err);
+
+        /*
+         * Don't bother checking return value, because "emacsclient --version"
+         * seems to always exits with code 1.
+         */
+        finish_command(&ec_process);
+
+        if (prefixcmp(buffer.buf, "emacsclient")) {
+                fprintf(stderr, "Failed to parse emacsclient version.\n");
+                strbuf_release(&buffer);
+                return -1;
+        }
+
+        strbuf_remove(&buffer, 0, strlen("emacsclient"));
+        version = atoi(buffer.buf);
+
+        if (version < 22) {
+                fprintf(stderr,
+                        "emacsclient version '%d' too old (< 22).\n",
+                        version);
+                strbuf_release(&buffer);
+                return -1;
+        }
+
+        strbuf_release(&buffer);
+        return 0;
+}
+
+static void exec_woman_emacs(const char* path, const char *page)
+{
+        if (!check_emacsclient_version()) {
+                /* This works only with emacsclient version >= 22. */
+                struct strbuf man_page = STRBUF_INIT;
+
+                if (!path)
+                        path = "emacsclient";
+                strbuf_addf(&man_page, "(woman \"%s\")", page);
+                execlp(path, "emacsclient", "-e", man_page.buf, NULL);
+                warning("failed to exec '%s': %s", path, strerror(errno));
+        }
+}
+
+static void exec_man_konqueror(const char* path, const char *page)
+{
+        const char *display = getenv("DISPLAY");
+        if (display && *display) {
+                struct strbuf man_page = STRBUF_INIT;
+                const char *filename = "kfmclient";
+
+                /* It's simpler to launch konqueror using kfmclient. */
+                if (path) {
+                        const char *file = strrchr(path, '/');
+                        if (file && !strcmp(file + 1, "konqueror")) {
+                                char *new = strdup(path);
+                                char *dest = strrchr(new, '/');
+
+                                /* strlen("konqueror") == strlen("kfmclient") */
+                                strcpy(dest + 1, "kfmclient");
+                                path = new;
+                        }
+                        if (file)
+                                filename = file;
+                } else
+                        path = "kfmclient";
+                strbuf_addf(&man_page, "man:%s(1)", page);
+                execlp(path, filename, "newTab", man_page.buf, NULL);
+                warning("failed to exec '%s': %s", path, strerror(errno));
+        }
+}
+
+static void exec_man_man(const char* path, const char *page)
+{
+        if (!path)
+                path = "man";
+        execlp(path, "man", page, NULL);
+        warning("failed to exec '%s': %s", path, strerror(errno));
+}
+
+static void exec_man_cmd(const char *cmd, const char *page)
+{
+        struct strbuf shell_cmd = STRBUF_INIT;
+        strbuf_addf(&shell_cmd, "%s %s", cmd, page);
+        execl("/bin/sh", "sh", "-c", shell_cmd.buf, NULL);
+        warning("failed to exec '%s': %s", cmd, strerror(errno));
+}
+
+static void add_man_viewer(const char *name)
+{
+        struct man_viewer_list **p = &man_viewer_list;
+        size_t len = strlen(name);
+
+        while (*p)
+                p = &((*p)->next);
+        *p = calloc(1, (sizeof(**p) + len + 1));
+        strncpy((*p)->name, name, len);
+}
+
+static int supported_man_viewer(const char *name, size_t len)
+{
+        return (!strncasecmp("man", name, len) ||
+                !strncasecmp("woman", name, len) ||
+                !strncasecmp("konqueror", name, len));
+}
+
+static void do_add_man_viewer_info(const char *name,
+                                   size_t len,
+                                   const char *value)
+{
+        struct man_viewer_info_list *new = calloc(1, sizeof(*new) + len + 1);
+
+        strncpy(new->name, name, len);
+        new->info = strdup(value);
+        new->next = man_viewer_info_list;
+        man_viewer_info_list = new;
+}
+
+static int add_man_viewer_path(const char *name,
+                               size_t len,
+                               const char *value)
+{
+        if (supported_man_viewer(name, len))
+                do_add_man_viewer_info(name, len, value);
+        else
+                warning("'%s': path for unsupported man viewer.\n"
+                        "Please consider using 'man.<tool>.cmd' instead.",
+                        name);
+
+        return 0;
+}
+
+static int add_man_viewer_cmd(const char *name,
+                              size_t len,
+                              const char *value)
+{
+        if (supported_man_viewer(name, len))
+                warning("'%s': cmd for supported man viewer.\n"
+                        "Please consider using 'man.<tool>.path' instead.",
+                        name);
+        else
+                do_add_man_viewer_info(name, len, value);
+
+        return 0;
+}
+
+static int add_man_viewer_info(const char *var, const char *value)
+{
+        const char *name = var + 4;
+        const char *subkey = strrchr(name, '.');
+
+        if (!subkey)
+                return error("Config with no key for man viewer: %s", name);
+
+        if (!strcmp(subkey, ".path")) {
+                if (!value)
+                        return config_error_nonbool(var);
+                return add_man_viewer_path(name, subkey - name, value);
+        }
+        if (!strcmp(subkey, ".cmd")) {
+                if (!value)
+                        return config_error_nonbool(var);
+                return add_man_viewer_cmd(name, subkey - name, value);
+        }
+
+        warning("'%s': unsupported man viewer sub key.", subkey);
+        return 0;
+}
+
+static int perf_help_config(const char *var, const char *value, void *cb)
+{
+        if (!strcmp(var, "help.format")) {
+                if (!value)
+                        return config_error_nonbool(var);
+                help_format = parse_help_format(value);
+                return 0;
+        }
+        if (!strcmp(var, "man.viewer")) {
+                if (!value)
+                        return config_error_nonbool(var);
+                add_man_viewer(value);
+                return 0;
+        }
+        if (!prefixcmp(var, "man."))
+                return add_man_viewer_info(var, value);
+
+        return perf_default_config(var, value, cb);
+}
+
+static struct cmdnames main_cmds, other_cmds;
+
+void list_common_cmds_help(void)
+{
+        int i, longest = 0;
+
+        for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+                if (longest < strlen(common_cmds[i].name))
+                        longest = strlen(common_cmds[i].name);
+        }
+
+        puts("The most commonly used perf commands are:");
+        for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+                printf("   %s   ", common_cmds[i].name);
+                mput_char(' ', longest - strlen(common_cmds[i].name));
+                puts(common_cmds[i].help);
+        }
+}
+
+static int is_perf_command(const char *s)
+{
+        return is_in_cmdlist(&main_cmds, s) ||
+                is_in_cmdlist(&other_cmds, s);
+}
+
+static const char *prepend(const char *prefix, const char *cmd)
+{
+        size_t pre_len = strlen(prefix);
+        size_t cmd_len = strlen(cmd);
+        char *p = malloc(pre_len + cmd_len + 1);
+        memcpy(p, prefix, pre_len);
+        strcpy(p + pre_len, cmd);
+        return p;
+}
+
+static const char *cmd_to_page(const char *perf_cmd)
+{
+        if (!perf_cmd)
+                return "perf";
+        else if (!prefixcmp(perf_cmd, "perf"))
+                return perf_cmd;
+        else if (is_perf_command(perf_cmd))
+                return prepend("perf-", perf_cmd);
+        else
+                return prepend("perf", perf_cmd);
+}
+
+static void setup_man_path(void)
+{
+        struct strbuf new_path = STRBUF_INIT;
+        const char *old_path = getenv("MANPATH");
+
+        /* We should always put ':' after our path. If there is no
+         * old_path, the ':' at the end will let 'man' to try
+         * system-wide paths after ours to find the manual page. If
+         * there is old_path, we need ':' as delimiter. */
+        strbuf_addstr(&new_path, system_path(PERF_MAN_PATH));
+        strbuf_addch(&new_path, ':');
+        if (old_path)
+                strbuf_addstr(&new_path, old_path);
+
+        setenv("MANPATH", new_path.buf, 1);
+
+        strbuf_release(&new_path);
+}
+
+static void exec_viewer(const char *name, const char *page)
+{
+        const char *info = get_man_viewer_info(name);
+
+        if (!strcasecmp(name, "man"))
+                exec_man_man(info, page);
+        else if (!strcasecmp(name, "woman"))
+                exec_woman_emacs(info, page);
+        else if (!strcasecmp(name, "konqueror"))
+                exec_man_konqueror(info, page);
+        else if (info)
+                exec_man_cmd(info, page);
+        else
+                warning("'%s': unknown man viewer.", name);
+}
+
+static void show_man_page(const char *perf_cmd)
+{
+        struct man_viewer_list *viewer;
+        const char *page = cmd_to_page(perf_cmd);
+        const char *fallback = getenv("PERF_MAN_VIEWER");
+
+        setup_man_path();
+        for (viewer = man_viewer_list; viewer; viewer = viewer->next)
+        {
+                exec_viewer(viewer->name, page); /* will return when unable */
+        }
+        if (fallback)
+                exec_viewer(fallback, page);
+        exec_viewer("man", page);
+        die("no man viewer handled the request");
+}
+
+static void show_info_page(const char *perf_cmd)
+{
+        const char *page = cmd_to_page(perf_cmd);
+        setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
+        execlp("info", "info", "perfman", page, NULL);
+}
+
+static void get_html_page_path(struct strbuf *page_path, const char *page)
+{
+        struct stat st;
+        const char *html_path = system_path(PERF_HTML_PATH);
+
+        /* Check that we have a perf documentation directory. */
+        if (stat(mkpath("%s/perf.html", html_path), &st)
+            || !S_ISREG(st.st_mode))
+                die("'%s': not a documentation directory.", html_path);
+
+        strbuf_init(page_path, 0);
+        strbuf_addf(page_path, "%s/%s.html", html_path, page);
+}
+
+/*
+ * If open_html is not defined in a platform-specific way (see for
+ * example compat/mingw.h), we use the script web--browse to display
+ * HTML.
+ */
+#ifndef open_html
+void open_html(const char *path)
+{
+        execl_perf_cmd("web--browse", "-c", "help.browser", path, NULL);
+}
+#endif
+
+static void show_html_page(const char *perf_cmd)
+{
+        const char *page = cmd_to_page(perf_cmd);
+        struct strbuf page_path; /* it leaks but we exec bellow */
+
+        get_html_page_path(&page_path, page);
+
+        open_html(page_path.buf);
+}
+
+int cmd_help(int argc, const char **argv, const char *prefix)
+{
+        int nonperf;
+        const char *alias;
+        load_command_list("perf-", &main_cmds, &other_cmds);
+
+        /* setup_perf_directory_gently(&nonperf); */
+        perf_config(perf_help_config, NULL);
+
+        argc = parse_options(argc, argv, builtin_help_options,
+                        builtin_help_usage, 0);
+
+        if (show_all) {
+                printf("usage: %s\n\n", perf_usage_string);
+                list_commands("perf commands", &main_cmds, &other_cmds);
+                printf("%s\n", perf_more_info_string);
+                return 0;
+        }
+
+        if (!argv[0]) {
+                printf("usage: %s\n\n", perf_usage_string);
+                list_common_cmds_help();
+                printf("\n%s\n", perf_more_info_string);
+                return 0;
+        }
+
+        alias = alias_lookup(argv[0]);
+        if (alias && !is_perf_command(argv[0])) {
+                printf("`perf %s' is aliased to `%s'\n", argv[0], alias);
+                return 0;
+        }
+
+        switch (help_format) {
+        case HELP_FORMAT_MAN:
+                show_man_page(argv[0]);
+                break;
+        case HELP_FORMAT_INFO:
+                show_info_page(argv[0]);
+                break;
+        case HELP_FORMAT_WEB:
+                show_html_page(argv[0]);
+                break;
+        }
+
+        return 0;
+}
diff --git a/Documentation/perf_counter/builtin-top.c b/Documentation/perf_counter/builtin-top.c
new file mode 100644
index 000000000000..9d2c769e5f83
--- /dev/null
+++ b/Documentation/perf_counter/builtin-top.c
@@ -0,0 +1,1411 @@
+/*
+ * kerneltop.c: show top kernel functions - performance counters showcase
+
+   Build with:
+
+     cc -O6 -Wall -c -o kerneltop.o kerneltop.c -lrt
+
+   Sample output:
+
+------------------------------------------------------------------------------
+ KernelTop:    2669 irqs/sec  [NMI, cache-misses/cache-refs],  (all, cpu: 2)
+------------------------------------------------------------------------------
+
+             weight         RIP          kernel function
+             ______   ________________   _______________
+
+              35.20 - ffffffff804ce74b : skb_copy_and_csum_dev
+              33.00 - ffffffff804cb740 : sock_alloc_send_skb
+              31.26 - ffffffff804ce808 : skb_push
+              22.43 - ffffffff80510004 : tcp_established_options
+              19.00 - ffffffff8027d250 : find_get_page
+              15.76 - ffffffff804e4fc9 : eth_type_trans
+              15.20 - ffffffff804d8baa : dst_release
+              14.86 - ffffffff804cf5d8 : skb_release_head_state
+              14.00 - ffffffff802217d5 : read_hpet
+              12.00 - ffffffff804ffb7f : __ip_local_out
+              11.97 - ffffffff804fc0c8 : ip_local_deliver_finish
+               8.54 - ffffffff805001a3 : ip_queue_xmit
+ */
+
+/*
+ * perfstat:  /usr/bin/time -alike performance counter statistics utility
+
+          It summarizes the counter events of all tasks (and child tasks),
+          covering all CPUs that the command (or workload) executes on.
+          It only counts the per-task events of the workload started,
+          independent of how many other tasks run on those CPUs.
+
+   Sample output:
+
+   $ ./perfstat -e 1 -e 3 -e 5 ls -lR /usr/include/ >/dev/null
+
+   Performance counter stats for 'ls':
+
+           163516953 instructions
+                2295 cache-misses
+             2855182 branch-misses
+ */
+
+ /*
+  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
+  *
+  * Improvements and fixes by:
+  *
+  *   Arjan van de Ven <arjan@linux.intel.com>
+  *   Yanmin Zhang <yanmin.zhang@intel.com>
+  *   Wu Fengguang <fengguang.wu@intel.com>
+  *   Mike Galbraith <efault@gmx.de>
+  *   Paul Mackerras <paulus@samba.org>
+  *
+  * Released under the GPL v2. (and only v2, not any later version)
+  */
+
+#include "util.h"
+
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <getopt.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <time.h>
+#include <sched.h>
+#include <pthread.h>
+
+#include <sys/syscall.h>
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <sys/prctl.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+#include <sys/mman.h>
+
+#include <linux/unistd.h>
+#include <linux/types.h>
+
+#include "../../include/linux/perf_counter.h"
+
+
+/*
+ * prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
+ * counters in the current task.
+ */
+#define PR_TASK_PERF_COUNTERS_DISABLE   31
+#define PR_TASK_PERF_COUNTERS_ENABLE    32
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+#define rdclock()                                       \
+({                                                      \
+        struct timespec ts;                             \
+                                                        \
+        clock_gettime(CLOCK_MONOTONIC, &ts);            \
+        ts.tv_sec * 1000000000ULL + ts.tv_nsec;         \
+})
+
+/*
+ * Pick up some kernel type conventions:
+ */
+#define __user
+#define asmlinkage
+
+#ifdef __x86_64__
+#define __NR_perf_counter_open 295
+#define rmb()           asm volatile("lfence" ::: "memory")
+#define cpu_relax()     asm volatile("rep; nop" ::: "memory");
+#endif
+
+#ifdef __i386__
+#define __NR_perf_counter_open 333
+#define rmb()           asm volatile("lfence" ::: "memory")
+#define cpu_relax()     asm volatile("rep; nop" ::: "memory");
+#endif
+
+#ifdef __powerpc__
+#define __NR_perf_counter_open 319
+#define rmb()           asm volatile ("sync" ::: "memory")
+#define cpu_relax()     asm volatile ("" ::: "memory");
+#endif
+
+#define unlikely(x)     __builtin_expect(!!(x), 0)
+#define min(x, y) ({                            \
+        typeof(x) _min1 = (x);                  \
+        typeof(y) _min2 = (y);                  \
+        (void) (&_min1 == &_min2);              \
+        _min1 < _min2 ? _min1 : _min2; })
+
+asmlinkage int sys_perf_counter_open(
+        struct perf_counter_hw_event    *hw_event_uptr          __user,
+        pid_t                           pid,
+        int                             cpu,
+        int                             group_fd,
+        unsigned long                   flags)
+{
+        return syscall(
+                __NR_perf_counter_open, hw_event_uptr, pid, cpu, group_fd, flags);
+}
+
+#define MAX_COUNTERS                    64
+#define MAX_NR_CPUS                     256
+
+#define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
+
+static int                      run_perfstat                    =  0;
+static int                      system_wide                     =  0;
+
+static int                      nr_counters                     =  0;
+static __u64                    event_id[MAX_COUNTERS]          = {
+        EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK),
+        EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),
+        EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),
+        EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),
+
+        EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),
+        EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS),
+        EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES),
+        EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES),
+};
+static int                      default_interval = 100000;
+static int                      event_count[MAX_COUNTERS];
+static int                      fd[MAX_NR_CPUS][MAX_COUNTERS];
+
+static __u64                    count_filter                   = 100;
+
+static int                      tid                             = -1;
+static int                      profile_cpu                     = -1;
+static int                      nr_cpus                         =  0;
+static int                      nmi                             =  1;
+static unsigned int             realtime_prio                   =  0;
+static int                      group                           =  0;
+static unsigned int             page_size;
+static unsigned int             mmap_pages                      =  16;
+static int                      use_mmap                        = 0;
+static int                      use_munmap                      = 0;
+
+static char                     *vmlinux;
+
+static char                     *sym_filter;
+static unsigned long            filter_start;
+static unsigned long            filter_end;
+
+static int                      delay_secs                      =  2;
+static int                      zero;
+static int                      dump_symtab;
+
+static int                      scale;
+
+struct source_line {
+        uint64_t                EIP;
+        unsigned long           count;
+        char                    *line;
+        struct source_line      *next;
+};
+
+static struct source_line       *lines;
+static struct source_line       **lines_tail;
+
+const unsigned int default_count[] = {
+        1000000,
+        1000000,
+          10000,
+          10000,
+        1000000,
+          10000,
+};
+
+static char *hw_event_names[] = {
+        "CPU cycles",
+        "instructions",
+        "cache references",
+        "cache misses",
+        "branches",
+        "branch misses",
+        "bus cycles",
+};
+
+static char *sw_event_names[] = {
+        "cpu clock ticks",
+        "task clock ticks",
+        "pagefaults",
+        "context switches",
+        "CPU migrations",
+        "minor faults",
+        "major faults",
+};
+
+struct event_symbol {
+        __u64 event;
+        char *symbol;
+};
+
+static struct event_symbol event_symbols[] = {
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),                "cpu-cycles",           },
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),                "cycles",               },
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS),              "instructions",         },
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES),          "cache-references",     },
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES),              "cache-misses",         },
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS),       "branch-instructions",  },
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS),       "branches",             },
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES),             "branch-misses",        },
+        {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES),                "bus-cycles",           },
+
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK),                 "cpu-clock",            },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK),                "task-clock",           },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),               "page-faults",          },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),               "faults",               },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN),           "minor-faults",         },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ),           "major-faults",         },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),          "context-switches",     },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),          "cs",                   },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),            "cpu-migrations",       },
+        {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),            "migrations",           },
+};
+
+#define __PERF_COUNTER_FIELD(config, name) \
+        ((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
+
+#define PERF_COUNTER_RAW(config)        __PERF_COUNTER_FIELD(config, RAW)
+#define PERF_COUNTER_CONFIG(config)     __PERF_COUNTER_FIELD(config, CONFIG)
+#define PERF_COUNTER_TYPE(config)       __PERF_COUNTER_FIELD(config, TYPE)
+#define PERF_COUNTER_ID(config)         __PERF_COUNTER_FIELD(config, EVENT)
+
+static void display_events_help(void)
+{
+        unsigned int i;
+        __u64 e;
+
+        printf(
+        " -e EVENT     --event=EVENT   #  symbolic-name        abbreviations");
+
+        for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
+                int type, id;
+
+                e = event_symbols[i].event;
+                type = PERF_COUNTER_TYPE(e);
+                id = PERF_COUNTER_ID(e);
+
+                printf("\n                             %d:%d: %-20s",
+                                type, id, event_symbols[i].symbol);
+        }
+
+        printf("\n"
+        "                           rNNN: raw PMU events (eventsel+umask)\n\n");
+}
+
+static void display_perfstat_help(void)
+{
+        printf(
+        "Usage: perfstat [<events...>] <cmd...>\n\n"
+        "PerfStat Options (up to %d event types can be specified):\n\n",
+                 MAX_COUNTERS);
+
+        display_events_help();
+
+        printf(
+        " -l                           # scale counter values\n"
+        " -a                           # system-wide collection\n");
+        exit(0);
+}
+
+static void display_help(void)
+{
+        if (run_perfstat)
+                return display_perfstat_help();
+
+        printf(
+        "Usage: kerneltop [<options>]\n"
+        "   Or: kerneltop -S [<options>] COMMAND [ARGS]\n\n"
+        "KernelTop Options (up to %d event types can be specified at once):\n\n",
+                 MAX_COUNTERS);
+
+        display_events_help();
+
+        printf(
+        " -S        --stat             # perfstat COMMAND\n"
+        " -a                           # system-wide collection (for perfstat)\n\n"
+        " -c CNT    --count=CNT        # event period to sample\n\n"
+        " -C CPU    --cpu=CPU          # CPU (-1 for all)                 [default: -1]\n"
+        " -p PID    --pid=PID          # PID of sampled task (-1 for all) [default: -1]\n\n"
+        " -l                           # show scale factor for RR events\n"
+        " -d delay  --delay=<seconds>  # sampling/display delay           [default:  2]\n"
+        " -f CNT    --filter=CNT       # min-event-count filter          [default: 100]\n\n"
+        " -r prio   --realtime=<prio>  # event acquisition runs with SCHED_FIFO policy\n"
+        " -s symbol --symbol=<symbol>  # function to be showed annotated one-shot\n"
+        " -x path   --vmlinux=<path>   # the vmlinux binary, required for -s use\n"
+        " -z        --zero             # zero counts after display\n"
+        " -D        --dump_symtab      # dump symbol table to stderr on startup\n"
+        " -m pages  --mmap_pages=<pages> # number of mmap data pages\n"
+        " -M        --mmap_info        # print mmap info stream\n"
+        " -U        --munmap_info      # print munmap info stream\n"
+        );
+
+        exit(0);
+}
+
+static char *event_name(int ctr)
+{
+        __u64 config = event_id[ctr];
+        int type = PERF_COUNTER_TYPE(config);
+        int id = PERF_COUNTER_ID(config);
+        static char buf[32];
+
+        if (PERF_COUNTER_RAW(config)) {
+                sprintf(buf, "raw 0x%llx", PERF_COUNTER_CONFIG(config));
+                return buf;
+        }
+
+        switch (type) {
+        case PERF_TYPE_HARDWARE:
+                if (id < PERF_HW_EVENTS_MAX)
+                        return hw_event_names[id];
+                return "unknown-hardware";
+
+        case PERF_TYPE_SOFTWARE:
+                if (id < PERF_SW_EVENTS_MAX)
+                        return sw_event_names[id];
+                return "unknown-software";
+
+        default:
+                break;
+        }
+
+        return "unknown";
+}
+
+/*
+ * Each event can have multiple symbolic names.
+ * Symbolic names are (almost) exactly matched.
+ */
+static __u64 match_event_symbols(char *str)
+{
+        __u64 config, id;
+        int type;
+        unsigned int i;
+
+        if (sscanf(str, "r%llx", &config) == 1)
+                return config | PERF_COUNTER_RAW_MASK;
+
+        if (sscanf(str, "%d:%llu", &type, &id) == 2)
+                return EID(type, id);
+
+        for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
+                if (!strncmp(str, event_symbols[i].symbol,
+                             strlen(event_symbols[i].symbol)))
+                        return event_symbols[i].event;
+        }
+
+        return ~0ULL;
+}
+
+static int parse_events(char *str)
+{
+        __u64 config;
+
+again:
+        if (nr_counters == MAX_COUNTERS)
+                return -1;
+
+        config = match_event_symbols(str);
+        if (config == ~0ULL)
+                return -1;
+
+        event_id[nr_counters] = config;
+        nr_counters++;
+
+        str = strstr(str, ",");
+        if (str) {
+                str++;
+                goto again;
+        }
+
+        return 0;
+}
+
+
+/*
+ * perfstat
+ */
+
+char fault_here[1000000];
+
+static void create_perfstat_counter(int counter)
+{
+        struct perf_counter_hw_event hw_event;
+
+        memset(&hw_event, 0, sizeof(hw_event));
+        hw_event.config         = event_id[counter];
+        hw_event.record_type    = 0;
+        hw_event.nmi            = 0;
+        if (scale)
+                hw_event.read_format    = PERF_FORMAT_TOTAL_TIME_ENABLED |
+                                          PERF_FORMAT_TOTAL_TIME_RUNNING;
+
+        if (system_wide) {
+                int cpu;
+                for (cpu = 0; cpu < nr_cpus; cpu ++) {
+                        fd[cpu][counter] = sys_perf_counter_open(&hw_event, -1, cpu, -1, 0);
+                        if (fd[cpu][counter] < 0) {
+                                printf("perfstat error: syscall returned with %d (%s)\n",
+                                                fd[cpu][counter], strerror(errno));
+                                exit(-1);
+                        }
+                }
+        } else {
+                hw_event.inherit        = 1;
+                hw_event.disabled       = 1;
+
+                fd[0][counter] = sys_perf_counter_open(&hw_event, 0, -1, -1, 0);
+                if (fd[0][counter] < 0) {
+                        printf("perfstat error: syscall returned with %d (%s)\n",
+                                        fd[0][counter], strerror(errno));
+                        exit(-1);
+                }
+        }
+}
+
+int do_perfstat(int argc, char *argv[])
+{
+        unsigned long long t0, t1;
+        int counter;
+        ssize_t res;
+        int status;
+        int pid;
+
+        if (!system_wide)
+                nr_cpus = 1;
+
+        for (counter = 0; counter < nr_counters; counter++)
+                create_perfstat_counter(counter);
+
+        argc -= optind;
+        argv += optind;
+
+        if (!argc)
+                display_help();
+
+        /*
+         * Enable counters and exec the command:
+         */
+        t0 = rdclock();
+        prctl(PR_TASK_PERF_COUNTERS_ENABLE);
+
+        if ((pid = fork()) < 0)
+                perror("failed to fork");
+        if (!pid) {
+                if (execvp(argv[0], argv)) {
+                        perror(argv[0]);
+                        exit(-1);
+                }
+        }
+        while (wait(&status) >= 0)
+                ;
+        prctl(PR_TASK_PERF_COUNTERS_DISABLE);
+        t1 = rdclock();
+
+        fflush(stdout);
+
+        fprintf(stderr, "\n");
+        fprintf(stderr, " Performance counter stats for \'%s\':\n",
+                argv[0]);
+        fprintf(stderr, "\n");
+
+        for (counter = 0; counter < nr_counters; counter++) {
+                int cpu, nv;
+                __u64 count[3], single_count[3];
+                int scaled;
+
+                count[0] = count[1] = count[2] = 0;
+                nv = scale ? 3 : 1;
+                for (cpu = 0; cpu < nr_cpus; cpu ++) {
+                        res = read(fd[cpu][counter],
+                                   single_count, nv * sizeof(__u64));
+                        assert(res == nv * sizeof(__u64));
+
+                        count[0] += single_count[0];
+                        if (scale) {
+                                count[1] += single_count[1];
+                                count[2] += single_count[2];
+                        }
+                }
+
+                scaled = 0;
+                if (scale) {
+                        if (count[2] == 0) {
+                                fprintf(stderr, " %14s  %-20s\n",
+                                        "<not counted>", event_name(counter));
+                                continue;
+                        }
+                        if (count[2] < count[1]) {
+                                scaled = 1;
+                                count[0] = (unsigned long long)
+                                        ((double)count[0] * count[1] / count[2] + 0.5);
+                        }
+                }
+
+                if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK) ||
+                    event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) {
+
+                        double msecs = (double)count[0] / 1000000;
+
+                        fprintf(stderr, " %14.6f  %-20s (msecs)",
+                                msecs, event_name(counter));
+                } else {
+                        fprintf(stderr, " %14Ld  %-20s (events)",
+                                count[0], event_name(counter));
+                }
+                if (scaled)
+                        fprintf(stderr, "  (scaled from %.2f%%)",
+                                (double) count[2] / count[1] * 100);
+                fprintf(stderr, "\n");
+        }
+        fprintf(stderr, "\n");
+        fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n",
+                        (double)(t1-t0)/1e6);
+        fprintf(stderr, "\n");
+
+        return 0;
+}
+
+/*
+ * Symbols
+ */
+
+static uint64_t                 min_ip;
+static uint64_t                 max_ip = -1ll;
+
+struct sym_entry {
+        unsigned long long      addr;
+        char                    *sym;
+        unsigned long           count[MAX_COUNTERS];
+        int                     skip;
+        struct source_line      *source;
+};
+
+#define MAX_SYMS                100000
+
+static int sym_table_count;
+
+struct sym_entry                *sym_filter_entry;
+
+static struct sym_entry         sym_table[MAX_SYMS];
+
+static void show_details(struct sym_entry *sym);
+
+/*
+ * Ordering weight: count-1 * count-2 * ... / count-n
+ */
+static double sym_weight(const struct sym_entry *sym)
+{
+        double weight;
+        int counter;
+
+        weight = sym->count[0];
+
+        for (counter = 1; counter < nr_counters-1; counter++)
+                weight *= sym->count[counter];
+
+        weight /= (sym->count[counter] + 1);
+
+        return weight;
+}
+
+static int compare(const void *__sym1, const void *__sym2)
+{
+        const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
+
+        return sym_weight(sym1) < sym_weight(sym2);
+}
+
+static long                     events;
+static long                     userspace_events;
+static const char               CONSOLE_CLEAR[] = "";
+
+static struct sym_entry         tmp[MAX_SYMS];
+
+static void print_sym_table(void)
+{
+        int i, printed;
+        int counter;
+        float events_per_sec = events/delay_secs;
+        float kevents_per_sec = (events-userspace_events)/delay_secs;
+        float sum_kevents = 0.0;
+
+        events = userspace_events = 0;
+        memcpy(tmp, sym_table, sizeof(sym_table[0])*sym_table_count);
+        qsort(tmp, sym_table_count, sizeof(tmp[0]), compare);
+
+        for (i = 0; i < sym_table_count && tmp[i].count[0]; i++)
+                sum_kevents += tmp[i].count[0];
+
+        write(1, CONSOLE_CLEAR, strlen(CONSOLE_CLEAR));
+
+        printf(
+"------------------------------------------------------------------------------\n");
+        printf( " KernelTop:%8.0f irqs/sec  kernel:%4.1f%% [%s, ",
+                events_per_sec,
+                100.0 - (100.0*((events_per_sec-kevents_per_sec)/events_per_sec)),
+                nmi ? "NMI" : "IRQ");
+
+        if (nr_counters == 1)
+                printf("%d ", event_count[0]);
+
+        for (counter = 0; counter < nr_counters; counter++) {
+                if (counter)
+                        printf("/");
+
+                printf("%s", event_name(counter));
+        }
+
+        printf( "], ");
+
+        if (tid != -1)
+                printf(" (tid: %d", tid);
+        else
+                printf(" (all");
+
+        if (profile_cpu != -1)
+                printf(", cpu: %d)\n", profile_cpu);
+        else {
+                if (tid != -1)
+                        printf(")\n");
+                else
+                        printf(", %d CPUs)\n", nr_cpus);
+        }
+
+        printf("------------------------------------------------------------------------------\n\n");
+
+        if (nr_counters == 1)
+                printf("             events    pcnt");
+        else
+                printf("  weight     events    pcnt");
+
+        printf("         RIP          kernel function\n"
+                       "  ______     ______   _____   ________________   _______________\n\n"
+        );
+
+        for (i = 0, printed = 0; i < sym_table_count; i++) {
+                float pcnt;
+                int count;
+
+                if (printed <= 18 && tmp[i].count[0] >= count_filter) {
+                        pcnt = 100.0 - (100.0*((sum_kevents-tmp[i].count[0])/sum_kevents));
+
+                        if (nr_counters == 1)
+                                printf("%19.2f - %4.1f%% - %016llx : %s\n",
+                                        sym_weight(tmp + i),
+                                        pcnt, tmp[i].addr, tmp[i].sym);
+                        else
+                                printf("%8.1f %10ld - %4.1f%% - %016llx : %s\n",
+                                        sym_weight(tmp + i),
+                                        tmp[i].count[0],
+                                        pcnt, tmp[i].addr, tmp[i].sym);
+                        printed++;
+                }
+                /*
+                 * Add decay to the counts:
+                 */
+                for (count = 0; count < nr_counters; count++)
+                        sym_table[i].count[count] = zero ? 0 : sym_table[i].count[count] * 7 / 8;
+        }
+
+        if (sym_filter_entry)
+                show_details(sym_filter_entry);
+
+        {
+                struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
+
+                if (poll(&stdin_poll, 1, 0) == 1) {
+                        printf("key pressed - exiting.\n");
+                        exit(0);
+                }
+        }
+}
+
+static void *display_thread(void *arg)
+{
+        printf("KernelTop refresh period: %d seconds\n", delay_secs);
+
+        while (!sleep(delay_secs))
+                print_sym_table();
+
+        return NULL;
+}
+
+static int read_symbol(FILE *in, struct sym_entry *s)
+{
+        static int filter_match = 0;
+        char *sym, stype;
+        char str[500];
+        int rc, pos;
+
+        rc = fscanf(in, "%llx %c %499s", &s->addr, &stype, str);
+        if (rc == EOF)
+                return -1;
+
+        assert(rc == 3);
+
+        /* skip until end of line: */
+        pos = strlen(str);
+        do {
+                rc = fgetc(in);
+                if (rc == '\n' || rc == EOF || pos >= 499)
+                        break;
+                str[pos] = rc;
+                pos++;
+        } while (1);
+        str[pos] = 0;
+
+        sym = str;
+
+        /* Filter out known duplicates and non-text symbols. */
+        if (!strcmp(sym, "_text"))
+                return 1;
+        if (!min_ip && !strcmp(sym, "_stext"))
+                return 1;
+        if (!strcmp(sym, "_etext") || !strcmp(sym, "_sinittext"))
+                return 1;
+        if (stype != 'T' && stype != 't')
+                return 1;
+        if (!strncmp("init_module", sym, 11) || !strncmp("cleanup_module", sym, 14))
+                return 1;
+        if (strstr(sym, "_text_start") || strstr(sym, "_text_end"))
+                return 1;
+
+        s->sym = malloc(strlen(str));
+        assert(s->sym);
+
+        strcpy((char *)s->sym, str);
+        s->skip = 0;
+
+        /* Tag events to be skipped. */
+        if (!strcmp("default_idle", s->sym) || !strcmp("cpu_idle", s->sym))
+                s->skip = 1;
+        else if (!strcmp("enter_idle", s->sym) || !strcmp("exit_idle", s->sym))
+                s->skip = 1;
+        else if (!strcmp("mwait_idle", s->sym))
+                s->skip = 1;
+
+        if (filter_match == 1) {
+                filter_end = s->addr;
+                filter_match = -1;
+                if (filter_end - filter_start > 10000) {
+                        printf("hm, too large filter symbol <%s> - skipping.\n",
+                                sym_filter);
+                        printf("symbol filter start: %016lx\n", filter_start);
+                        printf("                end: %016lx\n", filter_end);
+                        filter_end = filter_start = 0;
+                        sym_filter = NULL;
+                        sleep(1);
+                }
+        }
+        if (filter_match == 0 && sym_filter && !strcmp(s->sym, sym_filter)) {
+                filter_match = 1;
+                filter_start = s->addr;
+        }
+
+        return 0;
+}
+
+int compare_addr(const void *__sym1, const void *__sym2)
+{
+        const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
+
+        return sym1->addr > sym2->addr;
+}
+
+static void sort_symbol_table(void)
+{
+        int i, dups;
+
+        do {
+                qsort(sym_table, sym_table_count, sizeof(sym_table[0]), compare_addr);
+                for (i = 0, dups = 0; i < sym_table_count; i++) {
+                        if (sym_table[i].addr == sym_table[i+1].addr) {
+                                sym_table[i+1].addr = -1ll;
+                                dups++;
+                        }
+                }
+                sym_table_count -= dups;
+        } while(dups);
+}
+
+static void parse_symbols(void)
+{
+        struct sym_entry *last;
+
+        FILE *kallsyms = fopen("/proc/kallsyms", "r");
+
+        if (!kallsyms) {
+                printf("Could not open /proc/kallsyms - no CONFIG_KALLSYMS_ALL=y?\n");
+                exit(-1);
+        }
+
+        while (!feof(kallsyms)) {
+                if (read_symbol(kallsyms, &sym_table[sym_table_count]) == 0) {
+                        sym_table_count++;
+                        assert(sym_table_count <= MAX_SYMS);
+                }
+        }
+
+        sort_symbol_table();
+        min_ip = sym_table[0].addr;
+        max_ip = sym_table[sym_table_count-1].addr;
+        last = sym_table + sym_table_count++;
+
+        last->addr = -1ll;
+        last->sym = "<end>";
+
+        if (filter_end) {
+                int count;
+                for (count=0; count < sym_table_count; count ++) {
+                        if (!strcmp(sym_table[count].sym, sym_filter)) {
+                                sym_filter_entry = &sym_table[count];
+                                break;
+                        }
+                }
+        }
+        if (dump_symtab) {
+                int i;
+
+                for (i = 0; i < sym_table_count; i++)
+                        fprintf(stderr, "%llx %s\n",
+                                sym_table[i].addr, sym_table[i].sym);
+        }
+}
+
+/*
+ * Source lines
+ */
+
+static void parse_vmlinux(char *filename)
+{
+        FILE *file;
+        char command[PATH_MAX*2];
+        if (!filename)
+                return;
+
+        sprintf(command, "objdump --start-address=0x%016lx --stop-address=0x%016lx -dS %s", filter_start, filter_end, filename);
+
+        file = popen(command, "r");
+        if (!file)
+                return;
+
+        lines_tail = &lines;
+        while (!feof(file)) {
+                struct source_line *src;
+                size_t dummy = 0;
+                char *c;
+
+                src = malloc(sizeof(struct source_line));
+                assert(src != NULL);
+                memset(src, 0, sizeof(struct source_line));
+
+                if (getline(&src->line, &dummy, file) < 0)
+                        break;
+                if (!src->line)
+                        break;
+
+                c = strchr(src->line, '\n');
+                if (c)
+                        *c = 0;
+
+                src->next = NULL;
+                *lines_tail = src;
+                lines_tail = &src->next;
+
+                if (strlen(src->line)>8 && src->line[8] == ':')
+                        src->EIP = strtoull(src->line, NULL, 16);
+                if (strlen(src->line)>8 && src->line[16] == ':')
+                        src->EIP = strtoull(src->line, NULL, 16);
+        }
+        pclose(file);
+}
+
+static void record_precise_ip(uint64_t ip)
+{
+        struct source_line *line;
+
+        for (line = lines; line; line = line->next) {
+                if (line->EIP == ip)
+                        line->count++;
+                if (line->EIP > ip)
+                        break;
+        }
+}
+
+static void lookup_sym_in_vmlinux(struct sym_entry *sym)
+{
+        struct source_line *line;
+        char pattern[PATH_MAX];
+        sprintf(pattern, "<%s>:", sym->sym);
+
+        for (line = lines; line; line = line->next) {
+                if (strstr(line->line, pattern)) {
+                        sym->source = line;
+                        break;
+                }
+        }
+}
+
+static void show_lines(struct source_line *line_queue, int line_queue_count)
+{
+        int i;
+        struct source_line *line;
+
+        line = line_queue;
+        for (i = 0; i < line_queue_count; i++) {
+                printf("%8li\t%s\n", line->count, line->line);
+                line = line->next;
+        }
+}
+
+#define TRACE_COUNT     3
+
+static void show_details(struct sym_entry *sym)
+{
+        struct source_line *line;
+        struct source_line *line_queue = NULL;
+        int displayed = 0;
+        int line_queue_count = 0;
+
+        if (!sym->source)
+                lookup_sym_in_vmlinux(sym);
+        if (!sym->source)
+                return;
+
+        printf("Showing details for %s\n", sym->sym);
+
+        line = sym->source;
+        while (line) {
+                if (displayed && strstr(line->line, ">:"))
+                        break;
+
+                if (!line_queue_count)
+                        line_queue = line;
+                line_queue_count ++;
+
+                if (line->count >= count_filter) {
+                        show_lines(line_queue, line_queue_count);
+                        line_queue_count = 0;
+                        line_queue = NULL;
+                } else if (line_queue_count > TRACE_COUNT) {
+                        line_queue = line_queue->next;
+                        line_queue_count --;
+                }
+
+                line->count = 0;
+                displayed++;
+                if (displayed > 300)
+                        break;
+                line = line->next;
+        }
+}
+
+/*
+ * Binary search in the histogram table and record the hit:
+ */
+static void record_ip(uint64_t ip, int counter)
+{
+        int left_idx, middle_idx, right_idx, idx;
+        unsigned long left, middle, right;
+
+        record_precise_ip(ip);
+
+        left_idx = 0;
+        right_idx = sym_table_count-1;
+        assert(ip <= max_ip && ip >= min_ip);
+
+        while (left_idx + 1 < right_idx) {
+                middle_idx = (left_idx + right_idx) / 2;
+
+                left   = sym_table[  left_idx].addr;
+                middle = sym_table[middle_idx].addr;
+                right  = sym_table[ right_idx].addr;
+
+                if (!(left <= middle && middle <= right)) {
+                        printf("%016lx...\n%016lx...\n%016lx\n", left, middle, right);
+                        printf("%d %d %d\n", left_idx, middle_idx, right_idx);
+                }
+                assert(left <= middle && middle <= right);
+                if (!(left <= ip && ip <= right)) {
+                        printf(" left: %016lx\n", left);
+                        printf("   ip: %016lx\n", (unsigned long)ip);
+                        printf("right: %016lx\n", right);
+                }
+                assert(left <= ip && ip <= right);
+                /*
+                 * [ left .... target .... middle .... right ]
+                 *   => right := middle
+                 */
+                if (ip < middle) {
+                        right_idx = middle_idx;
+                        continue;
+                }
+                /*
+                 * [ left .... middle ... target ... right ]
+                 *   => left := middle
+                 */
+                left_idx = middle_idx;
+        }
+
+        idx = left_idx;
+
+        if (!sym_table[idx].skip)
+                sym_table[idx].count[counter]++;
+        else events--;
+}
+
+static void process_event(uint64_t ip, int counter)
+{
+        events++;
+
+        if (ip < min_ip || ip > max_ip) {
+                userspace_events++;
+                return;
+        }
+
+        record_ip(ip, counter);
+}
+
+static void process_options(int argc, char *argv[])
+{
+        int error = 0, counter;
+
+        if (strstr(argv[0], "perfstat"))
+                run_perfstat = 1;
+
+        for (;;) {
+                int option_index = 0;
+                /** Options for getopt */
+                static struct option long_options[] = {
+                        {"count",       required_argument,      NULL, 'c'},
+                        {"cpu",         required_argument,      NULL, 'C'},
+                        {"delay",       required_argument,      NULL, 'd'},
+                        {"dump_symtab", no_argument,            NULL, 'D'},
+                        {"event",       required_argument,      NULL, 'e'},
+                        {"filter",      required_argument,      NULL, 'f'},
+                        {"group",       required_argument,      NULL, 'g'},
+                        {"help",        no_argument,            NULL, 'h'},
+                        {"nmi",         required_argument,      NULL, 'n'},
+                        {"mmap_info",   no_argument,            NULL, 'M'},
+                        {"mmap_pages",  required_argument,      NULL, 'm'},
+                        {"munmap_info", no_argument,            NULL, 'U'},
+                        {"pid",         required_argument,      NULL, 'p'},
+                        {"realtime",    required_argument,      NULL, 'r'},
+                        {"scale",       no_argument,            NULL, 'l'},
+                        {"symbol",      required_argument,      NULL, 's'},
+                        {"stat",        no_argument,            NULL, 'S'},
+                        {"vmlinux",     required_argument,      NULL, 'x'},
+                        {"zero",        no_argument,            NULL, 'z'},
+                        {NULL,          0,                      NULL,  0 }
+                };
+                int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hln:m:p:r:s:Sx:zMU",
+                                    long_options, &option_index);
+                if (c == -1)
+                        break;
+
+                switch (c) {
+                case 'a': system_wide                   =              1; break;
+                case 'c': default_interval              =   atoi(optarg); break;
+                case 'C':
+                        /* CPU and PID are mutually exclusive */
+                        if (tid != -1) {
+                                printf("WARNING: CPU switch overriding PID\n");
+                                sleep(1);
+                                tid = -1;
+                        }
+                        profile_cpu                     =   atoi(optarg); break;
+                case 'd': delay_secs                    =   atoi(optarg); break;
+                case 'D': dump_symtab                   =              1; break;
+
+                case 'e': error                         = parse_events(optarg); break;
+
+                case 'f': count_filter                  =   atoi(optarg); break;
+                case 'g': group                         =   atoi(optarg); break;
+                case 'h':                                 display_help(); break;
+                case 'l': scale                         =              1; break;
+                case 'n': nmi                           =   atoi(optarg); break;
+                case 'p':
+                        /* CPU and PID are mutually exclusive */
+                        if (profile_cpu != -1) {
+                                printf("WARNING: PID switch overriding CPU\n");
+                                sleep(1);
+                                profile_cpu = -1;
+                        }
+                        tid                             =   atoi(optarg); break;
+                case 'r': realtime_prio                 =   atoi(optarg); break;
+                case 's': sym_filter                    = strdup(optarg); break;
+                case 'S': run_perfstat                  =              1; break;
+                case 'x': vmlinux                       = strdup(optarg); break;
+                case 'z': zero                          =              1; break;
+                case 'm': mmap_pages                    =   atoi(optarg); break;
+                case 'M': use_mmap                      =              1; break;
+                case 'U': use_munmap                    =              1; break;
+                default: error = 1; break;
+                }
+        }
+        if (error)
+                display_help();
+
+        if (!nr_counters) {
+                if (run_perfstat)
+                        nr_counters = 8;
+                else {
+                        nr_counters = 1;
+                        event_id[0] = 0;
+                }
+        }
+
+        for (counter = 0; counter < nr_counters; counter++) {
+                if (event_count[counter])
+                        continue;
+
+                event_count[counter] = default_interval;
+        }
+}
+
+struct mmap_data {
+        int counter;
+        void *base;
+        unsigned int mask;
+        unsigned int prev;
+};
+
+static unsigned int mmap_read_head(struct mmap_data *md)
+{
+        struct perf_counter_mmap_page *pc = md->base;
+        int head;
+
+        head = pc->data_head;
+        rmb();
+
+        return head;
+}
+
+struct timeval last_read, this_read;
+
+static void mmap_read(struct mmap_data *md)
+{
+        unsigned int head = mmap_read_head(md);
+        unsigned int old = md->prev;
+        unsigned char *data = md->base + page_size;
+        int diff;
+
+        gettimeofday(&this_read, NULL);
+
+        /*
+         * If we're further behind than half the buffer, there's a chance
+         * the writer will bite our tail and screw up the events under us.
+         *
+         * If we somehow ended up ahead of the head, we got messed up.
+         *
+         * In either case, truncate and restart at head.
+         */
+        diff = head - old;
+        if (diff > md->mask / 2 || diff < 0) {
+                struct timeval iv;
+                unsigned long msecs;
+
+                timersub(&this_read, &last_read, &iv);
+                msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
+
+                fprintf(stderr, "WARNING: failed to keep up with mmap data."
+                                "  Last read %lu msecs ago.\n", msecs);
+
+                /*
+                 * head points to a known good entry, start there.
+                 */
+                old = head;
+        }
+
+        last_read = this_read;
+
+        for (; old != head;) {
+                struct ip_event {
+                        struct perf_event_header header;
+                        __u64 ip;
+                        __u32 pid, tid;
+                };
+                struct mmap_event {
+                        struct perf_event_header header;
+                        __u32 pid, tid;
+                        __u64 start;
+                        __u64 len;
+                        __u64 pgoff;
+                        char filename[PATH_MAX];
+                };
+
+                typedef union event_union {
+                        struct perf_event_header header;
+                        struct ip_event ip;
+                        struct mmap_event mmap;
+                } event_t;
+
+                event_t *event = (event_t *)&data[old & md->mask];
+
+                event_t event_copy;
+
+                unsigned int size = event->header.size;
+
+                /*
+                 * Event straddles the mmap boundary -- header should always
+                 * be inside due to u64 alignment of output.
+                 */
+                if ((old & md->mask) + size != ((old + size) & md->mask)) {
+                        unsigned int offset = old;
+                        unsigned int len = min(sizeof(*event), size), cpy;
+                        void *dst = &event_copy;
+
+                        do {
+                                cpy = min(md->mask + 1 - (offset & md->mask), len);
+                                memcpy(dst, &data[offset & md->mask], cpy);
+                                offset += cpy;
+                                dst += cpy;
+                                len -= cpy;
+                        } while (len);
+
+                        event = &event_copy;
+                }
+
+                old += size;
+
+                if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) {
+                        if (event->header.type & PERF_RECORD_IP)
+                                process_event(event->ip.ip, md->counter);
+                } else {
+                        switch (event->header.type) {
+                                case PERF_EVENT_MMAP:
+                                case PERF_EVENT_MUNMAP:
+                                        printf("%s: %Lu %Lu %Lu %s\n",
+                                                        event->header.type == PERF_EVENT_MMAP
+                                                        ? "mmap" : "munmap",
+                                                        event->mmap.start,
+                                                        event->mmap.len,
+                                                        event->mmap.pgoff,
+                                                        event->mmap.filename);
+                                        break;
+                        }
+                }
+        }
+
+        md->prev = old;
+}
+
+int cmd_top(int argc, const char **argv, const char *prefix)
+{
+        struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
+        struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
+        struct perf_counter_hw_event hw_event;
+        pthread_t thread;
+        int i, counter, group_fd, nr_poll = 0;
+        unsigned int cpu;
+        int ret;
+
+        page_size = sysconf(_SC_PAGE_SIZE);
+
+        process_options(argc, argv);
+
+        nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+        assert(nr_cpus <= MAX_NR_CPUS);
+        assert(nr_cpus >= 0);
+
+        if (run_perfstat)
+                return do_perfstat(argc, argv);
+
+        if (tid != -1 || profile_cpu != -1)
+                nr_cpus = 1;
+
+        parse_symbols();
+        if (vmlinux && sym_filter_entry)
+                parse_vmlinux(vmlinux);
+
+        for (i = 0; i < nr_cpus; i++) {
+                group_fd = -1;
+                for (counter = 0; counter < nr_counters; counter++) {
+
+                        cpu     = profile_cpu;
+                        if (tid == -1 && profile_cpu == -1)
+                                cpu = i;
+
+                        memset(&hw_event, 0, sizeof(hw_event));
+                        hw_event.config         = event_id[counter];
+                        hw_event.irq_period     = event_count[counter];
+                        hw_event.record_type    = PERF_RECORD_IP | PERF_RECORD_TID;
+                        hw_event.nmi            = nmi;
+                        hw_event.mmap           = use_mmap;
+                        hw_event.munmap         = use_munmap;
+
+                        fd[i][counter] = sys_perf_counter_open(&hw_event, tid, cpu, group_fd, 0);
+                        if (fd[i][counter] < 0) {
+                                int err = errno;
+                                printf("kerneltop error: syscall returned with %d (%s)\n",
+                                        fd[i][counter], strerror(err));
+                                if (err == EPERM)
+                                        printf("Are you root?\n");
+                                exit(-1);
+                        }
+                        assert(fd[i][counter] >= 0);
+                        fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
+
+                        /*
+                         * First counter acts as the group leader:
+                         */
+                        if (group && group_fd == -1)
+                                group_fd = fd[i][counter];
+
+                        event_array[nr_poll].fd = fd[i][counter];
+                        event_array[nr_poll].events = POLLIN;
+                        nr_poll++;
+
+                        mmap_array[i][counter].counter = counter;
+                        mmap_array[i][counter].prev = 0;
+                        mmap_array[i][counter].mask = mmap_pages*page_size - 1;
+                        mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
+                                        PROT_READ, MAP_SHARED, fd[i][counter], 0);
+                        if (mmap_array[i][counter].base == MAP_FAILED) {
+                                printf("kerneltop error: failed to mmap with %d (%s)\n",
+                                                errno, strerror(errno));
+                                exit(-1);
+                        }
+                }
+        }
+
+        if (pthread_create(&thread, NULL, display_thread, NULL)) {
+                printf("Could not create display thread.\n");
+                exit(-1);
+        }
+
+        if (realtime_prio) {
+                struct sched_param param;
+
+                param.sched_priority = realtime_prio;
+                if (sched_setscheduler(0, SCHED_FIFO, &param)) {
+                        printf("Could not set realtime priority.\n");
+                        exit(-1);
+                }
+        }
+
+        while (1) {
+                int hits = events;
+
+                for (i = 0; i < nr_cpus; i++) {
+                        for (counter = 0; counter < nr_counters; counter++)
+                                mmap_read(&mmap_array[i][counter]);
+                }
+
+                if (hits == events)
+                        ret = poll(event_array, nr_poll, 100);
+        }
+
+        return 0;
+}
diff --git a/Documentation/perf_counter/builtin.h b/Documentation/perf_counter/builtin.h
new file mode 100644
index 000000000000..41637444ce2d
--- /dev/null
+++ b/Documentation/perf_counter/builtin.h
@@ -0,0 +1,18 @@
+#ifndef BUILTIN_H
+#define BUILTIN_H
+
+#include "util.h"
+#include "strbuf.h"
+
+extern const char perf_version_string[];
+extern const char perf_usage_string[];
+extern const char perf_more_info_string[];
+
+extern void list_common_cmds_help(void);
+extern const char *help_unknown_cmd(const char *cmd);
+extern void prune_packed_objects(int);
+extern int read_line_with_nul(char *buf, int size, FILE *file);
+extern int check_pager_config(const char *cmd);
+
+extern int cmd_top(int argc, const char **argv, const char *prefix);
+#endif
diff --git a/Documentation/perf_counter/cache.h b/Documentation/perf_counter/cache.h
new file mode 100644
index 000000000000..dc085640a57d
--- /dev/null
+++ b/Documentation/perf_counter/cache.h
@@ -0,0 +1,97 @@
+#ifndef CACHE_H
+#define CACHE_H
+
+#include "util.h"
+#include "strbuf.h"
+
+#define PERF_DIR_ENVIRONMENT "PERF_DIR"
+#define PERF_WORK_TREE_ENVIRONMENT "PERF_WORK_TREE"
+#define DEFAULT_PERF_DIR_ENVIRONMENT ".perf"
+#define DB_ENVIRONMENT "PERF_OBJECT_DIRECTORY"
+#define INDEX_ENVIRONMENT "PERF_INDEX_FILE"
+#define GRAFT_ENVIRONMENT "PERF_GRAFT_FILE"
+#define TEMPLATE_DIR_ENVIRONMENT "PERF_TEMPLATE_DIR"
+#define CONFIG_ENVIRONMENT "PERF_CONFIG"
+#define EXEC_PATH_ENVIRONMENT "PERF_EXEC_PATH"
+#define CEILING_DIRECTORIES_ENVIRONMENT "PERF_CEILING_DIRECTORIES"
+#define PERFATTRIBUTES_FILE ".perfattributes"
+#define INFOATTRIBUTES_FILE "info/attributes"
+#define ATTRIBUTE_MACRO_PREFIX "[attr]"
+
+typedef int (*config_fn_t)(const char *, const char *, void *);
+extern int perf_default_config(const char *, const char *, void *);
+extern int perf_config_from_file(config_fn_t fn, const char *, void *);
+extern int perf_config(config_fn_t fn, void *);
+extern int perf_parse_ulong(const char *, unsigned long *);
+extern int perf_config_int(const char *, const char *);
+extern unsigned long perf_config_ulong(const char *, const char *);
+extern int perf_config_bool_or_int(const char *, const char *, int *);
+extern int perf_config_bool(const char *, const char *);
+extern int perf_config_string(const char **, const char *, const char *);
+extern int perf_config_set(const char *, const char *);
+extern int perf_config_set_multivar(const char *, const char *, const char *, int);
+extern int perf_config_rename_section(const char *, const char *);
+extern const char *perf_etc_perfconfig(void);
+extern int check_repository_format_version(const char *var, const char *value, void *cb);
+extern int perf_config_system(void);
+extern int perf_config_global(void);
+extern int config_error_nonbool(const char *);
+extern const char *config_exclusive_filename;
+
+#define MAX_PERFNAME (1000)
+extern char perf_default_email[MAX_PERFNAME];
+extern char perf_default_name[MAX_PERFNAME];
+extern int user_ident_explicitly_given;
+
+extern const char *perf_log_output_encoding;
+extern const char *perf_mailmap_file;
+
+/* IO helper functions */
+extern void maybe_flush_or_die(FILE *, const char *);
+extern int copy_fd(int ifd, int ofd);
+extern int copy_file(const char *dst, const char *src, int mode);
+extern ssize_t read_in_full(int fd, void *buf, size_t count);
+extern ssize_t write_in_full(int fd, const void *buf, size_t count);
+extern void write_or_die(int fd, const void *buf, size_t count);
+extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
+extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
+extern void fsync_or_die(int fd, const char *);
+
+/* pager.c */
+extern void setup_pager(void);
+extern const char *pager_program;
+extern int pager_in_use(void);
+extern int pager_use_color;
+
+extern const char *editor_program;
+extern const char *excludes_file;
+
+char *alias_lookup(const char *alias);
+int split_cmdline(char *cmdline, const char ***argv);
+
+#define alloc_nr(x) (((x)+16)*3/2)
+
+/*
+ * Realloc the buffer pointed at by variable 'x' so that it can hold
+ * at least 'nr' entries; the number of entries currently allocated
+ * is 'alloc', using the standard growing factor alloc_nr() macro.
+ *
+ * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
+ */
+#define ALLOC_GROW(x, nr, alloc) \
+        do { \
+                if ((nr) > alloc) { \
+                        if (alloc_nr(alloc) < (nr)) \
+                                alloc = (nr); \
+                        else \
+                                alloc = alloc_nr(alloc); \
+                        x = xrealloc((x), alloc * sizeof(*(x))); \
+                } \
+        } while(0)
+
+
+static inline int is_absolute_path(const char *path)
+{
+        return path[0] == '/';
+}
+#endif /* CACHE_H */
diff --git a/Documentation/perf_counter/command-list.txt b/Documentation/perf_counter/command-list.txt
new file mode 100644
index 000000000000..1eab3659b206
--- /dev/null
+++ b/Documentation/perf_counter/command-list.txt
@@ -0,0 +1,4 @@
+# List of known perf commands.
+# command name                          category [deprecated] [common]
+perf-top                                mainporcelain common
+
diff --git a/Documentation/perf_counter/config.c b/Documentation/perf_counter/config.c
new file mode 100644
index 000000000000..672d53959334
--- /dev/null
+++ b/Documentation/perf_counter/config.c
@@ -0,0 +1,966 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ * Copyright (C) Johannes Schindelin, 2005
+ *
+ */
+#include "util.h"
+#include "cache.h"
+#include "exec_cmd.h"
+
+#define MAXNAME (256)
+
+static FILE *config_file;
+static const char *config_file_name;
+static int config_linenr;
+static int config_file_eof;
+static int zlib_compression_seen;
+
+const char *config_exclusive_filename = NULL;
+
+static int get_next_char(void)
+{
+        int c;
+        FILE *f;
+
+        c = '\n';
+        if ((f = config_file) != NULL) {
+                c = fgetc(f);
+                if (c == '\r') {
+                        /* DOS like systems */
+                        c = fgetc(f);
+                        if (c != '\n') {
+                                ungetc(c, f);
+                                c = '\r';
+                        }
+                }
+                if (c == '\n')
+                        config_linenr++;
+                if (c == EOF) {
+                        config_file_eof = 1;
+                        c = '\n';
+                }
+        }
+        return c;
+}
+
+static char *parse_value(void)
+{
+        static char value[1024];
+        int quote = 0, comment = 0, len = 0, space = 0;
+
+        for (;;) {
+                int c = get_next_char();
+                if (len >= sizeof(value) - 1)
+                        return NULL;
+                if (c == '\n') {
+                        if (quote)
+                                return NULL;
+                        value[len] = 0;
+                        return value;
+                }
+                if (comment)
+                        continue;
+                if (isspace(c) && !quote) {
+                        space = 1;
+                        continue;
+                }
+                if (!quote) {
+                        if (c == ';' || c == '#') {
+                                comment = 1;
+                                continue;
+                        }
+                }
+                if (space) {
+                        if (len)
+                                value[len++] = ' ';
+                        space = 0;
+                }
+                if (c == '\\') {
+                        c = get_next_char();
+                        switch (c) {
+                        case '\n':
+                                continue;
+                        case 't':
+                                c = '\t';
+                                break;
+                        case 'b':
+                                c = '\b';
+                                break;
+                        case 'n':
+                                c = '\n';
+                                break;
+                        /* Some characters escape as themselves */
+                        case '\\': case '"':
+                                break;
+                        /* Reject unknown escape sequences */
+                        default:
+                                return NULL;
+                        }
+                        value[len++] = c;
+                        continue;
+                }
+                if (c == '"') {
+                        quote = 1-quote;
+                        continue;
+                }
+                value[len++] = c;
+        }
+}
+
+static inline int iskeychar(int c)
+{
+        return isalnum(c) || c == '-';
+}
+
+static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
+{
+        int c;
+        char *value;
+
+        /* Get the full name */
+        for (;;) {
+                c = get_next_char();
+                if (config_file_eof)
+                        break;
+                if (!iskeychar(c))
+                        break;
+                name[len++] = tolower(c);
+                if (len >= MAXNAME)
+                        return -1;
+        }
+        name[len] = 0;
+        while (c == ' ' || c == '\t')
+                c = get_next_char();
+
+        value = NULL;
+        if (c != '\n') {
+                if (c != '=')
+                        return -1;
+                value = parse_value();
+                if (!value)
+                        return -1;
+        }
+        return fn(name, value, data);
+}
+
+static int get_extended_base_var(char *name, int baselen, int c)
+{
+        do {
+                if (c == '\n')
+                        return -1;
+                c = get_next_char();
+        } while (isspace(c));
+
+        /* We require the format to be '[base "extension"]' */
+        if (c != '"')
+                return -1;
+        name[baselen++] = '.';
+
+        for (;;) {
+                int c = get_next_char();
+                if (c == '\n')
+                        return -1;
+                if (c == '"')
+                        break;
+                if (c == '\\') {
+                        c = get_next_char();
+                        if (c == '\n')
+                                return -1;
+                }
+                name[baselen++] = c;
+                if (baselen > MAXNAME / 2)
+                        return -1;
+        }
+
+        /* Final ']' */
+        if (get_next_char() != ']')
+                return -1;
+        return baselen;
+}
+
+static int get_base_var(char *name)
+{
+        int baselen = 0;
+
+        for (;;) {
+                int c = get_next_char();
+                if (config_file_eof)
+                        return -1;
+                if (c == ']')
+                        return baselen;
+                if (isspace(c))
+                        return get_extended_base_var(name, baselen, c);
+                if (!iskeychar(c) && c != '.')
+                        return -1;
+                if (baselen > MAXNAME / 2)
+                        return -1;
+                name[baselen++] = tolower(c);
+        }
+}
+
+static int perf_parse_file(config_fn_t fn, void *data)
+{
+        int comment = 0;
+        int baselen = 0;
+        static char var[MAXNAME];
+
+        /* U+FEFF Byte Order Mark in UTF8 */
+        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
+        const unsigned char *bomptr = utf8_bom;
+
+        for (;;) {
+                int c = get_next_char();
+                if (bomptr && *bomptr) {
+                        /* We are at the file beginning; skip UTF8-encoded BOM
+                         * if present. Sane editors won't put this in on their
+                         * own, but e.g. Windows Notepad will do it happily. */
+                        if ((unsigned char) c == *bomptr) {
+                                bomptr++;
+                                continue;
+                        } else {
+                                /* Do not tolerate partial BOM. */
+                                if (bomptr != utf8_bom)
+                                        break;
+                                /* No BOM at file beginning. Cool. */
+                                bomptr = NULL;
+                        }
+                }
+                if (c == '\n') {
+                        if (config_file_eof)
+                                return 0;
+                        comment = 0;
+                        continue;
+                }
+                if (comment || isspace(c))
+                        continue;
+                if (c == '#' || c == ';') {
+                        comment = 1;
+                        continue;
+                }
+                if (c == '[') {
+                        baselen = get_base_var(var);
+                        if (baselen <= 0)
+                                break;
+                        var[baselen++] = '.';
+                        var[baselen] = 0;
+                        continue;
+                }
+                if (!isalpha(c))
+                        break;
+                var[baselen] = tolower(c);
+                if (get_value(fn, data, var, baselen+1) < 0)
+                        break;
+        }
+        die("bad config file line %d in %s", config_linenr, config_file_name);
+}
+
+static int parse_unit_factor(const char *end, unsigned long *val)
+{
+        if (!*end)
+                return 1;
+        else if (!strcasecmp(end, "k")) {
+                *val *= 1024;
+                return 1;
+        }
+        else if (!strcasecmp(end, "m")) {
+                *val *= 1024 * 1024;
+                return 1;
+        }
+        else if (!strcasecmp(end, "g")) {
+                *val *= 1024 * 1024 * 1024;
+                return 1;
+        }
+        return 0;
+}
+
+static int perf_parse_long(const char *value, long *ret)
+{
+        if (value && *value) {
+                char *end;
+                long val = strtol(value, &end, 0);
+                unsigned long factor = 1;
+                if (!parse_unit_factor(end, &factor))
+                        return 0;
+                *ret = val * factor;
+                return 1;
+        }
+        return 0;
+}
+
+int perf_parse_ulong(const char *value, unsigned long *ret)
+{
+        if (value && *value) {
+                char *end;
+                unsigned long val = strtoul(value, &end, 0);
+                if (!parse_unit_factor(end, &val))
+                        return 0;
+                *ret = val;
+                return 1;
+        }
+        return 0;
+}
+
+static void die_bad_config(const char *name)
+{
+        if (config_file_name)
+                die("bad config value for '%s' in %s", name, config_file_name);
+        die("bad config value for '%s'", name);
+}
+
+int perf_config_int(const char *name, const char *value)
+{
+        long ret = 0;
+        if (!perf_parse_long(value, &ret))
+                die_bad_config(name);
+        return ret;
+}
+
+unsigned long perf_config_ulong(const char *name, const char *value)
+{
+        unsigned long ret;
+        if (!perf_parse_ulong(value, &ret))
+                die_bad_config(name);
+        return ret;
+}
+
+int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
+{
+        *is_bool = 1;
+        if (!value)
+                return 1;
+        if (!*value)
+                return 0;
+        if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
+                return 1;
+        if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
+                return 0;
+        *is_bool = 0;
+        return perf_config_int(name, value);
+}
+
+int perf_config_bool(const char *name, const char *value)
+{
+        int discard;
+        return !!perf_config_bool_or_int(name, value, &discard);
+}
+
+int perf_config_string(const char **dest, const char *var, const char *value)
+{
+        if (!value)
+                return config_error_nonbool(var);
+        *dest = strdup(value);
+        return 0;
+}
+
+static int perf_default_core_config(const char *var, const char *value)
+{
+        /* Add other config variables here and to Documentation/config.txt. */
+        return 0;
+}
+
+int perf_default_config(const char *var, const char *value, void *dummy)
+{
+        if (!prefixcmp(var, "core."))
+                return perf_default_core_config(var, value);
+
+        /* Add other config variables here and to Documentation/config.txt. */
+        return 0;
+}
+
+int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
+{
+        int ret;
+        FILE *f = fopen(filename, "r");
+
+        ret = -1;
+        if (f) {
+                config_file = f;
+                config_file_name = filename;
+                config_linenr = 1;
+                config_file_eof = 0;
+                ret = perf_parse_file(fn, data);
+                fclose(f);
+                config_file_name = NULL;
+        }
+        return ret;
+}
+
+const char *perf_etc_perfconfig(void)
+{
+        static const char *system_wide;
+        if (!system_wide)
+                system_wide = system_path(ETC_PERFCONFIG);
+        return system_wide;
+}
+
+static int perf_env_bool(const char *k, int def)
+{
+        const char *v = getenv(k);
+        return v ? perf_config_bool(k, v) : def;
+}
+
+int perf_config_system(void)
+{
+        return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
+}
+
+int perf_config_global(void)
+{
+        return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
+}
+
+int perf_config(config_fn_t fn, void *data)
+{
+        int ret = 0, found = 0;
+        char *repo_config = NULL;
+        const char *home = NULL;
+
+        /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
+        if (config_exclusive_filename)
+                return perf_config_from_file(fn, config_exclusive_filename, data);
+        if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
+                ret += perf_config_from_file(fn, perf_etc_perfconfig(),
+                                            data);
+                found += 1;
+        }
+
+        home = getenv("HOME");
+        if (perf_config_global() && home) {
+                char *user_config = strdup(mkpath("%s/.perfconfig", home));
+                if (!access(user_config, R_OK)) {
+                        ret += perf_config_from_file(fn, user_config, data);
+                        found += 1;
+                }
+                free(user_config);
+        }
+
+        repo_config = perf_pathdup("config");
+        if (!access(repo_config, R_OK)) {
+                ret += perf_config_from_file(fn, repo_config, data);
+                found += 1;
+        }
+        free(repo_config);
+        if (found == 0)
+                return -1;
+        return ret;
+}
+
+/*
+ * Find all the stuff for perf_config_set() below.
+ */
+
+#define MAX_MATCHES 512
+
+static struct {
+        int baselen;
+        char* key;
+        int do_not_match;
+        regex_t* value_regex;
+        int multi_replace;
+        size_t offset[MAX_MATCHES];
+        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
+        int seen;
+} store;
+
+static int matches(const char* key, const char* value)
+{
+        return !strcmp(key, store.key) &&
+                (store.value_regex == NULL ||
+                 (store.do_not_match ^
+                  !regexec(store.value_regex, value, 0, NULL, 0)));
+}
+
+static int store_aux(const char* key, const char* value, void *cb)
+{
+        const char *ep;
+        size_t section_len;
+
+        switch (store.state) {
+        case KEY_SEEN:
+                if (matches(key, value)) {
+                        if (store.seen == 1 && store.multi_replace == 0) {
+                                warning("%s has multiple values", key);
+                        } else if (store.seen >= MAX_MATCHES) {
+                                error("too many matches for %s", key);
+                                return 1;
+                        }
+
+                        store.offset[store.seen] = ftell(config_file);
+                        store.seen++;
+                }
+                break;
+        case SECTION_SEEN:
+                /*
+                 * What we are looking for is in store.key (both
+                 * section and var), and its section part is baselen
+                 * long.  We found key (again, both section and var).
+                 * We would want to know if this key is in the same
+                 * section as what we are looking for.  We already
+                 * know we are in the same section as what should
+                 * hold store.key.
+                 */
+                ep = strrchr(key, '.');
+                section_len = ep - key;
+
+                if ((section_len != store.baselen) ||
+                    memcmp(key, store.key, section_len+1)) {
+                        store.state = SECTION_END_SEEN;
+                        break;
+                }
+
+                /*
+                 * Do not increment matches: this is no match, but we
+                 * just made sure we are in the desired section.
+                 */
+                store.offset[store.seen] = ftell(config_file);
+                /* fallthru */
+        case SECTION_END_SEEN:
+        case START:
+                if (matches(key, value)) {
+                        store.offset[store.seen] = ftell(config_file);
+                        store.state = KEY_SEEN;
+                        store.seen++;
+                } else {
+                        if (strrchr(key, '.') - key == store.baselen &&
+                              !strncmp(key, store.key, store.baselen)) {
+                                        store.state = SECTION_SEEN;
+                                        store.offset[store.seen] = ftell(config_file);
+                        }
+                }
+        }
+        return 0;
+}
+
+static int write_error(const char *filename)
+{
+        error("failed to write new configuration file %s", filename);
+
+        /* Same error code as "failed to rename". */
+        return 4;
+}
+
+static int store_write_section(int fd, const char* key)
+{
+        const char *dot;
+        int i, success;
+        struct strbuf sb = STRBUF_INIT;
+
+        dot = memchr(key, '.', store.baselen);
+        if (dot) {
+                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
+                for (i = dot - key + 1; i < store.baselen; i++) {
+                        if (key[i] == '"' || key[i] == '\\')
+                                strbuf_addch(&sb, '\\');
+                        strbuf_addch(&sb, key[i]);
+                }
+                strbuf_addstr(&sb, "\"]\n");
+        } else {
+                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
+        }
+
+        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
+        strbuf_release(&sb);
+
+        return success;
+}
+
+static int store_write_pair(int fd, const char* key, const char* value)
+{
+        int i, success;
+        int length = strlen(key + store.baselen + 1);
+        const char *quote = "";
+        struct strbuf sb = STRBUF_INIT;
+
+        /*
+         * Check to see if the value needs to be surrounded with a dq pair.
+         * Note that problematic characters are always backslash-quoted; this
+         * check is about not losing leading or trailing SP and strings that
+         * follow beginning-of-comment characters (i.e. ';' and '#') by the
+         * configuration parser.
+         */
+        if (value[0] == ' ')
+                quote = "\"";
+        for (i = 0; value[i]; i++)
+                if (value[i] == ';' || value[i] == '#')
+                        quote = "\"";
+        if (i && value[i - 1] == ' ')
+                quote = "\"";
+
+        strbuf_addf(&sb, "\t%.*s = %s",
+                    length, key + store.baselen + 1, quote);
+
+        for (i = 0; value[i]; i++)
+                switch (value[i]) {
+                case '\n':
+                        strbuf_addstr(&sb, "\\n");
+                        break;
+                case '\t':
+                        strbuf_addstr(&sb, "\\t");
+                        break;
+                case '"':
+                case '\\':
+                        strbuf_addch(&sb, '\\');
+                default:
+                        strbuf_addch(&sb, value[i]);
+                        break;
+                }
+        strbuf_addf(&sb, "%s\n", quote);
+
+        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
+        strbuf_release(&sb);
+
+        return success;
+}
+
+static ssize_t find_beginning_of_line(const char* contents, size_t size,
+        size_t offset_, int* found_bracket)
+{
+        size_t equal_offset = size, bracket_offset = size;
+        ssize_t offset;
+
+contline:
+        for (offset = offset_-2; offset > 0
+                        && contents[offset] != '\n'; offset--)
+                switch (contents[offset]) {
+                        case '=': equal_offset = offset; break;
+                        case ']': bracket_offset = offset; break;
+                }
+        if (offset > 0 && contents[offset-1] == '\\') {
+                offset_ = offset;
+                goto contline;
+        }
+        if (bracket_offset < equal_offset) {
+                *found_bracket = 1;
+                offset = bracket_offset+1;
+        } else
+                offset++;
+
+        return offset;
+}
+
+int perf_config_set(const char* key, const char* value)
+{
+        return perf_config_set_multivar(key, value, NULL, 0);
+}
+
+/*
+ * If value==NULL, unset in (remove from) config,
+ * if value_regex!=NULL, disregard key/value pairs where value does not match.
+ * if multi_replace==0, nothing, or only one matching key/value is replaced,
+ *     else all matching key/values (regardless how many) are removed,
+ *     before the new pair is written.
+ *
+ * Returns 0 on success.
+ *
+ * This function does this:
+ *
+ * - it locks the config file by creating ".perf/config.lock"
+ *
+ * - it then parses the config using store_aux() as validator to find
+ *   the position on the key/value pair to replace. If it is to be unset,
+ *   it must be found exactly once.
+ *
+ * - the config file is mmap()ed and the part before the match (if any) is
+ *   written to the lock file, then the changed part and the rest.
+ *
+ * - the config file is removed and the lock file rename()d to it.
+ *
+ */
+int perf_config_set_multivar(const char* key, const char* value,
+        const char* value_regex, int multi_replace)
+{
+        int i, dot;
+        int fd = -1, in_fd;
+        int ret;
+        char* config_filename;
+        const char* last_dot = strrchr(key, '.');
+
+        if (config_exclusive_filename)
+                config_filename = strdup(config_exclusive_filename);
+        else
+                config_filename = perf_pathdup("config");
+
+        /*
+         * Since "key" actually contains the section name and the real
+         * key name separated by a dot, we have to know where the dot is.
+         */
+
+        if (last_dot == NULL) {
+                error("key does not contain a section: %s", key);
+                ret = 2;
+                goto out_free;
+        }
+        store.baselen = last_dot - key;
+
+        store.multi_replace = multi_replace;
+
+        /*
+         * Validate the key and while at it, lower case it for matching.
+         */
+        store.key = malloc(strlen(key) + 1);
+        dot = 0;
+        for (i = 0; key[i]; i++) {
+                unsigned char c = key[i];
+                if (c == '.')
+                        dot = 1;
+                /* Leave the extended basename untouched.. */
+                if (!dot || i > store.baselen) {
+                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
+                                error("invalid key: %s", key);
+                                free(store.key);
+                                ret = 1;
+                                goto out_free;
+                        }
+                        c = tolower(c);
+                } else if (c == '\n') {
+                        error("invalid key (newline): %s", key);
+                        free(store.key);
+                        ret = 1;
+                        goto out_free;
+                }
+                store.key[i] = c;
+        }
+        store.key[i] = 0;
+
+        /*
+         * If .perf/config does not exist yet, write a minimal version.
+         */
+        in_fd = open(config_filename, O_RDONLY);
+        if ( in_fd < 0 ) {
+                free(store.key);
+
+                if ( ENOENT != errno ) {
+                        error("opening %s: %s", config_filename,
+                              strerror(errno));
+                        ret = 3; /* same as "invalid config file" */
+                        goto out_free;
+                }
+                /* if nothing to unset, error out */
+                if (value == NULL) {
+                        ret = 5;
+                        goto out_free;
+                }
+
+                store.key = (char*)key;
+                if (!store_write_section(fd, key) ||
+                    !store_write_pair(fd, key, value))
+                        goto write_err_out;
+        } else {
+                struct stat st;
+                char* contents;
+                size_t contents_sz, copy_begin, copy_end;
+                int i, new_line = 0;
+
+                if (value_regex == NULL)
+                        store.value_regex = NULL;
+                else {
+                        if (value_regex[0] == '!') {
+                                store.do_not_match = 1;
+                                value_regex++;
+                        } else
+                                store.do_not_match = 0;
+
+                        store.value_regex = (regex_t*)malloc(sizeof(regex_t));
+                        if (regcomp(store.value_regex, value_regex,
+                                        REG_EXTENDED)) {
+                                error("invalid pattern: %s", value_regex);
+                                free(store.value_regex);
+                                ret = 6;
+                                goto out_free;
+                        }
+                }
+
+                store.offset[0] = 0;
+                store.state = START;
+                store.seen = 0;
+
+                /*
+                 * After this, store.offset will contain the *end* offset
+                 * of the last match, or remain at 0 if no match was found.
+                 * As a side effect, we make sure to transform only a valid
+                 * existing config file.
+                 */
+                if (perf_config_from_file(store_aux, config_filename, NULL)) {
+                        error("invalid config file %s", config_filename);
+                        free(store.key);
+                        if (store.value_regex != NULL) {
+                                regfree(store.value_regex);
+                                free(store.value_regex);
+                        }
+                        ret = 3;
+                        goto out_free;
+                }
+
+                free(store.key);
+                if (store.value_regex != NULL) {
+                        regfree(store.value_regex);
+                        free(store.value_regex);
+                }
+
+                /* if nothing to unset, or too many matches, error out */
+                if ((store.seen == 0 && value == NULL) ||
+                                (store.seen > 1 && multi_replace == 0)) {
+                        ret = 5;
+                        goto out_free;
+                }
+
+                fstat(in_fd, &st);
+                contents_sz = xsize_t(st.st_size);
+                contents = mmap(NULL, contents_sz, PROT_READ,
+                        MAP_PRIVATE, in_fd, 0);
+                close(in_fd);
+
+                if (store.seen == 0)
+                        store.seen = 1;
+
+                for (i = 0, copy_begin = 0; i < store.seen; i++) {
+                        if (store.offset[i] == 0) {
+                                store.offset[i] = copy_end = contents_sz;
+                        } else if (store.state != KEY_SEEN) {
+                                copy_end = store.offset[i];
+                        } else
+                                copy_end = find_beginning_of_line(
+                                        contents, contents_sz,
+                                        store.offset[i]-2, &new_line);
+
+                        if (copy_end > 0 && contents[copy_end-1] != '\n')
+                                new_line = 1;
+
+                        /* write the first part of the config */
+                        if (copy_end > copy_begin) {
+                                if (write_in_full(fd, contents + copy_begin,
+                                                  copy_end - copy_begin) <
+                                    copy_end - copy_begin)
+                                        goto write_err_out;
+                                if (new_line &&
+                                    write_in_full(fd, "\n", 1) != 1)
+                                        goto write_err_out;
+                        }
+                        copy_begin = store.offset[i];
+                }
+
+                /* write the pair (value == NULL means unset) */
+                if (value != NULL) {
+                        if (store.state == START) {
+                                if (!store_write_section(fd, key))
+                                        goto write_err_out;
+                        }
+                        if (!store_write_pair(fd, key, value))
+                                goto write_err_out;
+                }
+
+                /* write the rest of the config */
+                if (copy_begin < contents_sz)
+                        if (write_in_full(fd, contents + copy_begin,
+                                          contents_sz - copy_begin) <
+                            contents_sz - copy_begin)
+                                goto write_err_out;
+
+                munmap(contents, contents_sz);
+        }
+
+        ret = 0;
+
+out_free:
+        free(config_filename);
+        return ret;
+
+write_err_out:
+        goto out_free;
+
+}
+
+static int section_name_match (const char *buf, const char *name)
+{
+        int i = 0, j = 0, dot = 0;
+        for (; buf[i] && buf[i] != ']'; i++) {
+                if (!dot && isspace(buf[i])) {
+                        dot = 1;
+                        if (name[j++] != '.')
+                                break;
+                        for (i++; isspace(buf[i]); i++)
+                                ; /* do nothing */
+                        if (buf[i] != '"')
+                                break;
+                        continue;
+                }
+                if (buf[i] == '\\' && dot)
+                        i++;
+                else if (buf[i] == '"' && dot) {
+                        for (i++; isspace(buf[i]); i++)
+                                ; /* do_nothing */
+                        break;
+                }
+                if (buf[i] != name[j++])
+                        break;
+        }
+        return (buf[i] == ']' && name[j] == 0);
+}
+
+/* if new_name == NULL, the section is removed instead */
+int perf_config_rename_section(const char *old_name, const char *new_name)
+{
+        int ret = 0, remove = 0;
+        char *config_filename;
+        int out_fd;
+        char buf[1024];
+
+        if (config_exclusive_filename)
+                config_filename = strdup(config_exclusive_filename);
+        else
+                config_filename = perf_pathdup("config");
+        if (out_fd < 0) {
+                ret = error("could not lock config file %s", config_filename);
+                goto out;
+        }
+
+        if (!(config_file = fopen(config_filename, "rb"))) {
+                /* no config file means nothing to rename, no error */
+                goto unlock_and_out;
+        }
+
+        while (fgets(buf, sizeof(buf), config_file)) {
+                int i;
+                int length;
+                for (i = 0; buf[i] && isspace(buf[i]); i++)
+                        ; /* do nothing */
+                if (buf[i] == '[') {
+                        /* it's a section */
+                        if (section_name_match (&buf[i+1], old_name)) {
+                                ret++;
+                                if (new_name == NULL) {
+                                        remove = 1;
+                                        continue;
+                                }
+                                store.baselen = strlen(new_name);
+                                if (!store_write_section(out_fd, new_name)) {
+                                        goto out;
+                                }
+                                continue;
+                        }
+                        remove = 0;
+                }
+                if (remove)
+                        continue;
+                length = strlen(buf);
+                if (write_in_full(out_fd, buf, length) != length) {
+                        goto out;
+                }
+        }
+        fclose(config_file);
+ unlock_and_out:
+ out:
+        free(config_filename);
+        return ret;
+}
+
+/*
+ * Call this to report error for your variable that should not
+ * get a boolean value (i.e. "[my] var" means "true").
+ */
+int config_error_nonbool(const char *var)
+{
+        return error("Missing value for '%s'", var);
+}
diff --git a/Documentation/perf_counter/ctype.c b/Documentation/perf_counter/ctype.c
new file mode 100644
index 000000000000..b90ec004f29c
--- /dev/null
+++ b/Documentation/perf_counter/ctype.c
@@ -0,0 +1,26 @@
+/*
+ * Sane locale-independent, ASCII ctype.
+ *
+ * No surprises, and works with signed and unsigned chars.
+ */
+#include "cache.h"
+
+enum {
+        S = GIT_SPACE,
+        A = GIT_ALPHA,
+        D = GIT_DIGIT,
+        G = GIT_GLOB_SPECIAL,   /* *, ?, [, \\ */
+        R = GIT_REGEX_SPECIAL,  /* $, (, ), +, ., ^, {, | * */
+};
+
+unsigned char sane_ctype[256] = {
+        0, 0, 0, 0, 0, 0, 0, 0, 0, S, S, 0, 0, S, 0, 0,         /*   0.. 15 */
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,         /*  16.. 31 */
+        S, 0, 0, 0, R, 0, 0, 0, R, R, G, R, 0, 0, R, 0,         /*  32.. 47 */
+        D, D, D, D, D, D, D, D, D, D, 0, 0, 0, 0, 0, G,         /*  48.. 63 */
+        0, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A,         /*  64.. 79 */
+        A, A, A, A, A, A, A, A, A, A, A, G, G, 0, R, 0,         /*  80.. 95 */
+        0, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A,         /*  96..111 */
+        A, A, A, A, A, A, A, A, A, A, A, R, R, 0, 0, 0,         /* 112..127 */
+        /* Nothing in the 128.. range */
+};
diff --git a/Documentation/perf_counter/exec_cmd.c b/Documentation/perf_counter/exec_cmd.c
new file mode 100644
index 000000000000..d39292263153
--- /dev/null
+++ b/Documentation/perf_counter/exec_cmd.c
@@ -0,0 +1,165 @@
+#include "cache.h"
+#include "exec_cmd.h"
+#include "quote.h"
+#define MAX_ARGS        32
+
+extern char **environ;
+static const char *argv_exec_path;
+static const char *argv0_path;
+
+const char *system_path(const char *path)
+{
+#ifdef RUNTIME_PREFIX
+        static const char *prefix;
+#else
+        static const char *prefix = PREFIX;
+#endif
+        struct strbuf d = STRBUF_INIT;
+
+        if (is_absolute_path(path))
+                return path;
+
+#ifdef RUNTIME_PREFIX
+        assert(argv0_path);
+        assert(is_absolute_path(argv0_path));
+
+        if (!prefix &&
+            !(prefix = strip_path_suffix(argv0_path, PERF_EXEC_PATH)) &&
+            !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
+            !(prefix = strip_path_suffix(argv0_path, "perf"))) {
+                prefix = PREFIX;
+                fprintf(stderr, "RUNTIME_PREFIX requested, "
+                                "but prefix computation failed.  "
+                                "Using static fallback '%s'.\n", prefix);
+        }
+#endif
+
+        strbuf_addf(&d, "%s/%s", prefix, path);
+        path = strbuf_detach(&d, NULL);
+        return path;
+}
+
+const char *perf_extract_argv0_path(const char *argv0)
+{
+        const char *slash;
+
+        if (!argv0 || !*argv0)
+                return NULL;
+        slash = argv0 + strlen(argv0);
+
+        while (argv0 <= slash && !is_dir_sep(*slash))
+                slash--;
+
+        if (slash >= argv0) {
+                argv0_path = strndup(argv0, slash - argv0);
+                return slash + 1;
+        }
+
+        return argv0;
+}
+
+void perf_set_argv_exec_path(const char *exec_path)
+{
+        argv_exec_path = exec_path;
+        /*
+         * Propagate this setting to external programs.
+         */
+        setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
+}
+
+
+/* Returns the highest-priority, location to look for perf programs. */
+const char *perf_exec_path(void)
+{
+        const char *env;
+
+        if (argv_exec_path)
+                return argv_exec_path;
+
+        env = getenv(EXEC_PATH_ENVIRONMENT);
+        if (env && *env) {
+                return env;
+        }
+
+        return system_path(PERF_EXEC_PATH);
+}
+
+static void add_path(struct strbuf *out, const char *path)
+{
+        if (path && *path) {
+                if (is_absolute_path(path))
+                        strbuf_addstr(out, path);
+                else
+                        strbuf_addstr(out, make_nonrelative_path(path));
+
+                strbuf_addch(out, PATH_SEP);
+        }
+}
+
+void setup_path(void)
+{
+        const char *old_path = getenv("PATH");
+        struct strbuf new_path = STRBUF_INIT;
+
+        add_path(&new_path, perf_exec_path());
+        add_path(&new_path, argv0_path);
+
+        if (old_path)
+                strbuf_addstr(&new_path, old_path);
+        else
+                strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
+
+        setenv("PATH", new_path.buf, 1);
+
+        strbuf_release(&new_path);
+}
+
+const char **prepare_perf_cmd(const char **argv)
+{
+        int argc;
+        const char **nargv;
+
+        for (argc = 0; argv[argc]; argc++)
+                ; /* just counting */
+        nargv = malloc(sizeof(*nargv) * (argc + 2));
+
+        nargv[0] = "perf";
+        for (argc = 0; argv[argc]; argc++)
+                nargv[argc + 1] = argv[argc];
+        nargv[argc + 1] = NULL;
+        return nargv;
+}
+
+int execv_perf_cmd(const char **argv) {
+        const char **nargv = prepare_perf_cmd(argv);
+
+        /* execvp() can only ever return if it fails */
+        execvp("perf", (char **)nargv);
+
+        free(nargv);
+        return -1;
+}
+
+
+int execl_perf_cmd(const char *cmd,...)
+{
+        int argc;
+        const char *argv[MAX_ARGS + 1];
+        const char *arg;
+        va_list param;
+
+        va_start(param, cmd);
+        argv[0] = cmd;
+        argc = 1;
+        while (argc < MAX_ARGS) {
+                arg = argv[argc++] = va_arg(param, char *);
+                if (!arg)
+                        break;
+        }
+        va_end(param);
+        if (MAX_ARGS <= argc)
+                return error("too many args to run %s", cmd);
+
+        argv[argc] = NULL;
+        return execv_perf_cmd(argv);
+}
diff --git a/Documentation/perf_counter/exec_cmd.h b/Documentation/perf_counter/exec_cmd.h
new file mode 100644
index 000000000000..effe25eb1545
--- /dev/null
+++ b/Documentation/perf_counter/exec_cmd.h
@@ -0,0 +1,13 @@
+#ifndef PERF_EXEC_CMD_H
+#define PERF_EXEC_CMD_H
+
+extern void perf_set_argv_exec_path(const char *exec_path);
+extern const char *perf_extract_argv0_path(const char *path);
+extern const char *perf_exec_path(void);
+extern void setup_path(void);
+extern const char **prepare_perf_cmd(const char **argv);
+extern int execv_perf_cmd(const char **argv); /* NULL terminated */
+extern int execl_perf_cmd(const char *cmd, ...);
+extern const char *system_path(const char *path);
+
+#endif /* PERF_EXEC_CMD_H */
diff --git a/Documentation/perf_counter/generate-cmdlist.sh b/Documentation/perf_counter/generate-cmdlist.sh
new file mode 100755
index 000000000000..75c68d948fd3
--- /dev/null
+++ b/Documentation/perf_counter/generate-cmdlist.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+echo "/* Automatically generated by $0 */
+struct cmdname_help
+{
+    char name[16];
+    char help[80];
+};
+
+static struct cmdname_help common_cmds[] = {"
+
+sed -n -e 's/^git-\([^  ]*\)[   ].* common.*/\1/p' command-list.txt |
+sort |
+while read cmd
+do
+     sed -n '
+     /^NAME/,/git-'"$cmd"'/H
+     ${
+            x
+            s/.*git-'"$cmd"' - \(.*\)/  {"'"$cmd"'", "\1"},/
+            p
+     }' "Documentation/git-$cmd.txt"
+done
+echo "};"
diff --git a/Documentation/perf_counter/help.c b/Documentation/perf_counter/help.c
new file mode 100644
index 000000000000..ec0116721660
--- /dev/null
+++ b/Documentation/perf_counter/help.c
@@ -0,0 +1,366 @@
+#include "cache.h"
+#include "builtin.h"
+#include "exec_cmd.h"
+#include "levenshtein.h"
+#include "help.h"
+
+/* most GUI terminals set COLUMNS (although some don't export it) */
+static int term_columns(void)
+{
+        char *col_string = getenv("COLUMNS");
+        int n_cols;
+
+        if (col_string && (n_cols = atoi(col_string)) > 0)
+                return n_cols;
+
+#ifdef TIOCGWINSZ
+        {
+                struct winsize ws;
+                if (!ioctl(1, TIOCGWINSZ, &ws)) {
+                        if (ws.ws_col)
+                                return ws.ws_col;
+                }
+        }
+#endif
+
+        return 80;
+}
+
+void add_cmdname(struct cmdnames *cmds, const char *name, int len)
+{
+        struct cmdname *ent = malloc(sizeof(*ent) + len + 1);
+
+        ent->len = len;
+        memcpy(ent->name, name, len);
+        ent->name[len] = 0;
+
+        ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
+        cmds->names[cmds->cnt++] = ent;
+}
+
+static void clean_cmdnames(struct cmdnames *cmds)
+{
+        int i;
+        for (i = 0; i < cmds->cnt; ++i)
+                free(cmds->names[i]);
+        free(cmds->names);
+        cmds->cnt = 0;
+        cmds->alloc = 0;
+}
+
+static int cmdname_compare(const void *a_, const void *b_)
+{
+        struct cmdname *a = *(struct cmdname **)a_;
+        struct cmdname *b = *(struct cmdname **)b_;
+        return strcmp(a->name, b->name);
+}
+
+static void uniq(struct cmdnames *cmds)
+{
+        int i, j;
+
+        if (!cmds->cnt)
+                return;
+
+        for (i = j = 1; i < cmds->cnt; i++)
+                if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
+                        cmds->names[j++] = cmds->names[i];
+
+        cmds->cnt = j;
+}
+
+void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
+{
+        int ci, cj, ei;
+        int cmp;
+
+        ci = cj = ei = 0;
+        while (ci < cmds->cnt && ei < excludes->cnt) {
+                cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
+                if (cmp < 0)
+                        cmds->names[cj++] = cmds->names[ci++];
+                else if (cmp == 0)
+                        ci++, ei++;
+                else if (cmp > 0)
+                        ei++;
+        }
+
+        while (ci < cmds->cnt)
+                cmds->names[cj++] = cmds->names[ci++];
+
+        cmds->cnt = cj;
+}
+
+static void pretty_print_string_list(struct cmdnames *cmds, int longest)
+{
+        int cols = 1, rows;
+        int space = longest + 1; /* min 1 SP between words */
+        int max_cols = term_columns() - 1; /* don't print *on* the edge */
+        int i, j;
+
+        if (space < max_cols)
+                cols = max_cols / space;
+        rows = (cmds->cnt + cols - 1) / cols;
+
+        for (i = 0; i < rows; i++) {
+                printf("  ");
+
+                for (j = 0; j < cols; j++) {
+                        int n = j * rows + i;
+                        int size = space;
+                        if (n >= cmds->cnt)
+                                break;
+                        if (j == cols-1 || n + rows >= cmds->cnt)
+                                size = 1;
+                        printf("%-*s", size, cmds->names[n]->name);
+                }
+                putchar('\n');
+        }
+}
+
+static int is_executable(const char *name)
+{
+        struct stat st;
+
+        if (stat(name, &st) || /* stat, not lstat */
+            !S_ISREG(st.st_mode))
+                return 0;
+
+#ifdef __MINGW32__
+        /* cannot trust the executable bit, peek into the file instead */
+        char buf[3] = { 0 };
+        int n;
+        int fd = open(name, O_RDONLY);
+        st.st_mode &= ~S_IXUSR;
+        if (fd >= 0) {
+                n = read(fd, buf, 2);
+                if (n == 2)
+                        /* DOS executables start with "MZ" */
+                        if (!strcmp(buf, "#!") || !strcmp(buf, "MZ"))
+                                st.st_mode |= S_IXUSR;
+                close(fd);
+        }
+#endif
+        return st.st_mode & S_IXUSR;
+}
+
+static void list_commands_in_dir(struct cmdnames *cmds,
+                                         const char *path,
+                                         const char *prefix)
+{
+        int prefix_len;
+        DIR *dir = opendir(path);
+        struct dirent *de;
+        struct strbuf buf = STRBUF_INIT;
+        int len;
+
+        if (!dir)
+                return;
+        if (!prefix)
+                prefix = "perf-";
+        prefix_len = strlen(prefix);
+
+        strbuf_addf(&buf, "%s/", path);
+        len = buf.len;
+
+        while ((de = readdir(dir)) != NULL) {
+                int entlen;
+
+                if (prefixcmp(de->d_name, prefix))
+                        continue;
+
+                strbuf_setlen(&buf, len);
+                strbuf_addstr(&buf, de->d_name);
+                if (!is_executable(buf.buf))
+                        continue;
+
+                entlen = strlen(de->d_name) - prefix_len;
+                if (has_extension(de->d_name, ".exe"))
+                        entlen -= 4;
+
+                add_cmdname(cmds, de->d_name + prefix_len, entlen);
+        }
+        closedir(dir);
+        strbuf_release(&buf);
+}
+
+void load_command_list(const char *prefix,
+                struct cmdnames *main_cmds,
+                struct cmdnames *other_cmds)
+{
+        const char *env_path = getenv("PATH");
+        const char *exec_path = perf_exec_path();
+
+        if (exec_path) {
+                list_commands_in_dir(main_cmds, exec_path, prefix);
+                qsort(main_cmds->names, main_cmds->cnt,
+                      sizeof(*main_cmds->names), cmdname_compare);
+                uniq(main_cmds);
+        }
+
+        if (env_path) {
+                char *paths, *path, *colon;
+                path = paths = strdup(env_path);
+                while (1) {
+                        if ((colon = strchr(path, PATH_SEP)))
+                                *colon = 0;
+                        if (!exec_path || strcmp(path, exec_path))
+                                list_commands_in_dir(other_cmds, path, prefix);
+
+                        if (!colon)
+                                break;
+                        path = colon + 1;
+                }
+                free(paths);
+
+                qsort(other_cmds->names, other_cmds->cnt,
+                      sizeof(*other_cmds->names), cmdname_compare);
+                uniq(other_cmds);
+        }
+        exclude_cmds(other_cmds, main_cmds);
+}
+
+void list_commands(const char *title, struct cmdnames *main_cmds,
+                   struct cmdnames *other_cmds)
+{
+        int i, longest = 0;
+
+        for (i = 0; i < main_cmds->cnt; i++)
+                if (longest < main_cmds->names[i]->len)
+                        longest = main_cmds->names[i]->len;
+        for (i = 0; i < other_cmds->cnt; i++)
+                if (longest < other_cmds->names[i]->len)
+                        longest = other_cmds->names[i]->len;
+
+        if (main_cmds->cnt) {
+                const char *exec_path = perf_exec_path();
+                printf("available %s in '%s'\n", title, exec_path);
+                printf("----------------");
+                mput_char('-', strlen(title) + strlen(exec_path));
+                putchar('\n');
+                pretty_print_string_list(main_cmds, longest);
+                putchar('\n');
+        }
+
+        if (other_cmds->cnt) {
+                printf("%s available from elsewhere on your $PATH\n", title);
+                printf("---------------------------------------");
+                mput_char('-', strlen(title));
+                putchar('\n');
+                pretty_print_string_list(other_cmds, longest);
+                putchar('\n');
+        }
+}
+
+int is_in_cmdlist(struct cmdnames *c, const char *s)
+{
+        int i;
+        for (i = 0; i < c->cnt; i++)
+                if (!strcmp(s, c->names[i]->name))
+                        return 1;
+        return 0;
+}
+
+static int autocorrect;
+static struct cmdnames aliases;
+
+static int perf_unknown_cmd_config(const char *var, const char *value, void *cb)
+{
+        if (!strcmp(var, "help.autocorrect"))
+                autocorrect = perf_config_int(var,value);
+        /* Also use aliases for command lookup */
+        if (!prefixcmp(var, "alias."))
+                add_cmdname(&aliases, var + 6, strlen(var + 6));
+
+        return perf_default_config(var, value, cb);
+}
+
+static int levenshtein_compare(const void *p1, const void *p2)
+{
+        const struct cmdname *const *c1 = p1, *const *c2 = p2;
+        const char *s1 = (*c1)->name, *s2 = (*c2)->name;
+        int l1 = (*c1)->len;
+        int l2 = (*c2)->len;
+        return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
+}
+
+static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
+{
+        int i;
+        ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
+
+        for (i = 0; i < old->cnt; i++)
+                cmds->names[cmds->cnt++] = old->names[i];
+        free(old->names);
+        old->cnt = 0;
+        old->names = NULL;
+}
+
+const char *help_unknown_cmd(const char *cmd)
+{
+        int i, n, best_similarity = 0;
+        struct cmdnames main_cmds, other_cmds;
+
+        memset(&main_cmds, 0, sizeof(main_cmds));
+        memset(&other_cmds, 0, sizeof(main_cmds));
+        memset(&aliases, 0, sizeof(aliases));
+
+        perf_config(perf_unknown_cmd_config, NULL);
+
+        load_command_list("perf-", &main_cmds, &other_cmds);
+
+        add_cmd_list(&main_cmds, &aliases);
+        add_cmd_list(&main_cmds, &other_cmds);
+        qsort(main_cmds.names, main_cmds.cnt,
+              sizeof(main_cmds.names), cmdname_compare);
+        uniq(&main_cmds);
+
+        /* This reuses cmdname->len for similarity index */
+        for (i = 0; i < main_cmds.cnt; ++i)
+                main_cmds.names[i]->len =
+                        levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
+
+        qsort(main_cmds.names, main_cmds.cnt,
+              sizeof(*main_cmds.names), levenshtein_compare);
+
+        if (!main_cmds.cnt)
+                die ("Uh oh. Your system reports no Git commands at all.");
+
+        best_similarity = main_cmds.names[0]->len;
+        n = 1;
+        while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
+                ++n;
+        if (autocorrect && n == 1) {
+                const char *assumed = main_cmds.names[0]->name;
+                main_cmds.names[0] = NULL;
+                clean_cmdnames(&main_cmds);
+                fprintf(stderr, "WARNING: You called a Git program named '%s', "
+                        "which does not exist.\n"
+                        "Continuing under the assumption that you meant '%s'\n",
+                        cmd, assumed);
+                if (autocorrect > 0) {
+                        fprintf(stderr, "in %0.1f seconds automatically...\n",
+                                (float)autocorrect/10.0);
+                        poll(NULL, 0, autocorrect * 100);
+                }
+                return assumed;
+        }
+
+        fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd);
+
+        if (best_similarity < 6) {
+                fprintf(stderr, "\nDid you mean %s?\n",
+                        n < 2 ? "this": "one of these");
+
+                for (i = 0; i < n; i++)
+                        fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
+        }
+
+        exit(1);
+}
+
+int cmd_version(int argc, const char **argv, const char *prefix)
+{
+        printf("perf version %s\n", perf_version_string);
+        return 0;
+}
diff --git a/Documentation/perf_counter/help.h b/Documentation/perf_counter/help.h
new file mode 100644
index 000000000000..56bc15406ffc
--- /dev/null
+++ b/Documentation/perf_counter/help.h
@@ -0,0 +1,29 @@
+#ifndef HELP_H
+#define HELP_H
+
+struct cmdnames {
+        int alloc;
+        int cnt;
+        struct cmdname {
+                size_t len; /* also used for similarity index in help.c */
+                char name[FLEX_ARRAY];
+        } **names;
+};
+
+static inline void mput_char(char c, unsigned int num)
+{
+        while(num--)
+                putchar(c);
+}
+
+void load_command_list(const char *prefix,
+                struct cmdnames *main_cmds,
+                struct cmdnames *other_cmds);
+void add_cmdname(struct cmdnames *cmds, const char *name, int len);
+/* Here we require that excludes is a sorted list. */
+void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes);
+int is_in_cmdlist(struct cmdnames *c, const char *s);
+void list_commands(const char *title, struct cmdnames *main_cmds,
+                   struct cmdnames *other_cmds);
+
+#endif /* HELP_H */
diff --git a/Documentation/perf_counter/levenshtein.c b/Documentation/perf_counter/levenshtein.c
new file mode 100644
index 000000000000..e521d1516df6
--- /dev/null
+++ b/Documentation/perf_counter/levenshtein.c
@@ -0,0 +1,84 @@
+#include "cache.h"
+#include "levenshtein.h"
+
+/*
+ * This function implements the Damerau-Levenshtein algorithm to
+ * calculate a distance between strings.
+ *
+ * Basically, it says how many letters need to be swapped, substituted,
+ * deleted from, or added to string1, at least, to get string2.
+ *
+ * The idea is to build a distance matrix for the substrings of both
+ * strings.  To avoid a large space complexity, only the last three rows
+ * are kept in memory (if swaps had the same or higher cost as one deletion
+ * plus one insertion, only two rows would be needed).
+ *
+ * At any stage, "i + 1" denotes the length of the current substring of
+ * string1 that the distance is calculated for.
+ *
+ * row2 holds the current row, row1 the previous row (i.e. for the substring
+ * of string1 of length "i"), and row0 the row before that.
+ *
+ * In other words, at the start of the big loop, row2[j + 1] contains the
+ * Damerau-Levenshtein distance between the substring of string1 of length
+ * "i" and the substring of string2 of length "j + 1".
+ *
+ * All the big loop does is determine the partial minimum-cost paths.
+ *
+ * It does so by calculating the costs of the path ending in characters
+ * i (in string1) and j (in string2), respectively, given that the last
+ * operation is a substition, a swap, a deletion, or an insertion.
+ *
+ * This implementation allows the costs to be weighted:
+ *
+ * - w (as in "sWap")
+ * - s (as in "Substitution")
+ * - a (for insertion, AKA "Add")
+ * - d (as in "Deletion")
+ *
+ * Note that this algorithm calculates a distance _iff_ d == a.
+ */
+int levenshtein(const char *string1, const char *string2,
+                int w, int s, int a, int d)
+{
+        int len1 = strlen(string1), len2 = strlen(string2);
+        int *row0 = malloc(sizeof(int) * (len2 + 1));
+        int *row1 = malloc(sizeof(int) * (len2 + 1));
+        int *row2 = malloc(sizeof(int) * (len2 + 1));
+        int i, j;
+
+        for (j = 0; j <= len2; j++)
+                row1[j] = j * a;
+        for (i = 0; i < len1; i++) {
+                int *dummy;
+
+                row2[0] = (i + 1) * d;
+                for (j = 0; j < len2; j++) {
+                        /* substitution */
+                        row2[j + 1] = row1[j] + s * (string1[i] != string2[j]);
+                        /* swap */
+                        if (i > 0 && j > 0 && string1[i - 1] == string2[j] &&
+                                        string1[i] == string2[j - 1] &&
+                                        row2[j + 1] > row0[j - 1] + w)
+                                row2[j + 1] = row0[j - 1] + w;
+                        /* deletion */
+                        if (row2[j + 1] > row1[j + 1] + d)
+                                row2[j + 1] = row1[j + 1] + d;
+                        /* insertion */
+                        if (row2[j + 1] > row2[j] + a)
+                                row2[j + 1] = row2[j] + a;
+                }
+
+                dummy = row0;
+                row0 = row1;
+                row1 = row2;
+                row2 = dummy;
+        }
+
+        i = row1[len2];
+        free(row0);
+        free(row1);
+        free(row2);
+
+        return i;
+}
diff --git a/Documentation/perf_counter/levenshtein.h b/Documentation/perf_counter/levenshtein.h
new file mode 100644
index 000000000000..0173abeef52c
--- /dev/null
+++ b/Documentation/perf_counter/levenshtein.h
@@ -0,0 +1,8 @@
+#ifndef LEVENSHTEIN_H
+#define LEVENSHTEIN_H
+
+int levenshtein(const char *string1, const char *string2,
+        int swap_penalty, int substition_penalty,
+        int insertion_penalty, int deletion_penalty);
+
+#endif
diff --git a/Documentation/perf_counter/parse-options.c b/Documentation/perf_counter/parse-options.c
new file mode 100644
index 000000000000..7464f34e5407
--- /dev/null
+++ b/Documentation/perf_counter/parse-options.c
@@ -0,0 +1,495 @@
+#include "util.h"
+#include "parse-options.h"
+#include "cache.h"
+
+#define OPT_SHORT 1
+#define OPT_UNSET 2
+
+static int opterror(const struct option *opt, const char *reason, int flags)
+{
+        if (flags & OPT_SHORT)
+                return error("switch `%c' %s", opt->short_name, reason);
+        if (flags & OPT_UNSET)
+                return error("option `no-%s' %s", opt->long_name, reason);
+        return error("option `%s' %s", opt->long_name, reason);
+}
+
+static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
+                   int flags, const char **arg)
+{
+        if (p->opt) {
+                *arg = p->opt;
+                p->opt = NULL;
+        } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
+                *arg = (const char *)opt->defval;
+        } else if (p->argc > 1) {
+                p->argc--;
+                *arg = *++p->argv;
+        } else
+                return opterror(opt, "requires a value", flags);
+        return 0;
+}
+
+static int get_value(struct parse_opt_ctx_t *p,
+                     const struct option *opt, int flags)
+{
+        const char *s, *arg;
+        const int unset = flags & OPT_UNSET;
+
+        if (unset && p->opt)
+                return opterror(opt, "takes no value", flags);
+        if (unset && (opt->flags & PARSE_OPT_NONEG))
+                return opterror(opt, "isn't available", flags);
+
+        if (!(flags & OPT_SHORT) && p->opt) {
+                switch (opt->type) {
+                case OPTION_CALLBACK:
+                        if (!(opt->flags & PARSE_OPT_NOARG))
+                                break;
+                        /* FALLTHROUGH */
+                case OPTION_BOOLEAN:
+                case OPTION_BIT:
+                case OPTION_SET_INT:
+                case OPTION_SET_PTR:
+                        return opterror(opt, "takes no value", flags);
+                default:
+                        break;
+                }
+        }
+
+        switch (opt->type) {
+        case OPTION_BIT:
+                if (unset)
+                        *(int *)opt->value &= ~opt->defval;
+                else
+                        *(int *)opt->value |= opt->defval;
+                return 0;
+
+        case OPTION_BOOLEAN:
+                *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
+                return 0;
+
+        case OPTION_SET_INT:
+                *(int *)opt->value = unset ? 0 : opt->defval;
+                return 0;
+
+        case OPTION_SET_PTR:
+                *(void **)opt->value = unset ? NULL : (void *)opt->defval;
+                return 0;
+
+        case OPTION_STRING:
+                if (unset)
+                        *(const char **)opt->value = NULL;
+                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
+                        *(const char **)opt->value = (const char *)opt->defval;
+                else
+                        return get_arg(p, opt, flags, (const char **)opt->value);
+                return 0;
+
+        case OPTION_CALLBACK:
+                if (unset)
+                        return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
+                if (opt->flags & PARSE_OPT_NOARG)
+                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
+                if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
+                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
+                if (get_arg(p, opt, flags, &arg))
+                        return -1;
+                return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
+
+        case OPTION_INTEGER:
+                if (unset) {
+                        *(int *)opt->value = 0;
+                        return 0;
+                }
+                if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
+                        *(int *)opt->value = opt->defval;
+                        return 0;
+                }
+                if (get_arg(p, opt, flags, &arg))
+                        return -1;
+                *(int *)opt->value = strtol(arg, (char **)&s, 10);
+                if (*s)
+                        return opterror(opt, "expects a numerical value", flags);
+                return 0;
+
+        default:
+                die("should not happen, someone must be hit on the forehead");
+        }
+}
+
+static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
+{
+        for (; options->type != OPTION_END; options++) {
+                if (options->short_name == *p->opt) {
+                        p->opt = p->opt[1] ? p->opt + 1 : NULL;
+                        return get_value(p, options, OPT_SHORT);
+                }
+        }
+        return -2;
+}
+
+static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
+                          const struct option *options)
+{
+        const char *arg_end = strchr(arg, '=');
+        const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
+        int abbrev_flags = 0, ambiguous_flags = 0;
+
+        if (!arg_end)
+                arg_end = arg + strlen(arg);
+
+        for (; options->type != OPTION_END; options++) {
+                const char *rest;
+                int flags = 0;
+
+                if (!options->long_name)
+                        continue;
+
+                rest = skip_prefix(arg, options->long_name);
+                if (options->type == OPTION_ARGUMENT) {
+                        if (!rest)
+                                continue;
+                        if (*rest == '=')
+                                return opterror(options, "takes no value", flags);
+                        if (*rest)
+                                continue;
+                        p->out[p->cpidx++] = arg - 2;
+                        return 0;
+                }
+                if (!rest) {
+                        /* abbreviated? */
+                        if (!strncmp(options->long_name, arg, arg_end - arg)) {
+is_abbreviated:
+                                if (abbrev_option) {
+                                        /*
+                                         * If this is abbreviated, it is
+                                         * ambiguous. So when there is no
+                                         * exact match later, we need to
+                                         * error out.
+                                         */
+                                        ambiguous_option = abbrev_option;
+                                        ambiguous_flags = abbrev_flags;
+                                }
+                                if (!(flags & OPT_UNSET) && *arg_end)
+                                        p->opt = arg_end + 1;
+                                abbrev_option = options;
+                                abbrev_flags = flags;
+                                continue;
+                        }
+                        /* negated and abbreviated very much? */
+                        if (!prefixcmp("no-", arg)) {
+                                flags |= OPT_UNSET;
+                                goto is_abbreviated;
+                        }
+                        /* negated? */
+                        if (strncmp(arg, "no-", 3))
+                                continue;
+                        flags |= OPT_UNSET;
+                        rest = skip_prefix(arg + 3, options->long_name);
+                        /* abbreviated and negated? */
+                        if (!rest && !prefixcmp(options->long_name, arg + 3))
+                                goto is_abbreviated;
+                        if (!rest)
+                                continue;
+                }
+                if (*rest) {
+                        if (*rest != '=')
+                                continue;
+                        p->opt = rest + 1;
+                }
+                return get_value(p, options, flags);
+        }
+
+        if (ambiguous_option)
+                return error("Ambiguous option: %s "
+                        "(could be --%s%s or --%s%s)",
+                        arg,
+                        (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
+                        ambiguous_option->long_name,
+                        (abbrev_flags & OPT_UNSET) ?  "no-" : "",
+                        abbrev_option->long_name);
+        if (abbrev_option)
+                return get_value(p, abbrev_option, abbrev_flags);
+        return -2;
+}
+
+static void check_typos(const char *arg, const struct option *options)
+{
+        if (strlen(arg) < 3)
+                return;
+
+        if (!prefixcmp(arg, "no-")) {
+                error ("did you mean `--%s` (with two dashes ?)", arg);
+                exit(129);
+        }
+
+        for (; options->type != OPTION_END; options++) {
+                if (!options->long_name)
+                        continue;
+                if (!prefixcmp(options->long_name, arg)) {
+                        error ("did you mean `--%s` (with two dashes ?)", arg);
+                        exit(129);
+                }
+        }
+}
+
+void parse_options_start(struct parse_opt_ctx_t *ctx,
+                         int argc, const char **argv, int flags)
+{
+        memset(ctx, 0, sizeof(*ctx));
+        ctx->argc = argc - 1;
+        ctx->argv = argv + 1;
+        ctx->out  = argv;
+        ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
+        ctx->flags = flags;
+        if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
+            (flags & PARSE_OPT_STOP_AT_NON_OPTION))
+                die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
+}
+
+static int usage_with_options_internal(const char * const *,
+                                       const struct option *, int);
+
+int parse_options_step(struct parse_opt_ctx_t *ctx,
+                       const struct option *options,
+                       const char * const usagestr[])
+{
+        int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
+
+        /* we must reset ->opt, unknown short option leave it dangling */
+        ctx->opt = NULL;
+
+        for (; ctx->argc; ctx->argc--, ctx->argv++) {
+                const char *arg = ctx->argv[0];
+
+                if (*arg != '-' || !arg[1]) {
+                        if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
+                                break;
+                        ctx->out[ctx->cpidx++] = ctx->argv[0];
+                        continue;
+                }
+
+                if (arg[1] != '-') {
+                        ctx->opt = arg + 1;
+                        if (internal_help && *ctx->opt == 'h')
+                                return parse_options_usage(usagestr, options);
+                        switch (parse_short_opt(ctx, options)) {
+                        case -1:
+                                return parse_options_usage(usagestr, options);
+                        case -2:
+                                goto unknown;
+                        }
+                        if (ctx->opt)
+                                check_typos(arg + 1, options);
+                        while (ctx->opt) {
+                                if (internal_help && *ctx->opt == 'h')
+                                        return parse_options_usage(usagestr, options);
+                                switch (parse_short_opt(ctx, options)) {
+                                case -1:
+                                        return parse_options_usage(usagestr, options);
+                                case -2:
+                                        /* fake a short option thing to hide the fact that we may have
+                                         * started to parse aggregated stuff
+                                         *
+                                         * This is leaky, too bad.
+                                         */
+                                        ctx->argv[0] = strdup(ctx->opt - 1);
+                                        *(char *)ctx->argv[0] = '-';
+                                        goto unknown;
+                                }
+                        }
+                        continue;
+                }
+
+                if (!arg[2]) { /* "--" */
+                        if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
+                                ctx->argc--;
+                                ctx->argv++;
+                        }
+                        break;
+                }
+
+                if (internal_help && !strcmp(arg + 2, "help-all"))
+                        return usage_with_options_internal(usagestr, options, 1);
+                if (internal_help && !strcmp(arg + 2, "help"))
+                        return parse_options_usage(usagestr, options);
+                switch (parse_long_opt(ctx, arg + 2, options)) {
+                case -1:
+                        return parse_options_usage(usagestr, options);
+                case -2:
+                        goto unknown;
+                }
+                continue;
+unknown:
+                if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
+                        return PARSE_OPT_UNKNOWN;
+                ctx->out[ctx->cpidx++] = ctx->argv[0];
+                ctx->opt = NULL;
+        }
+        return PARSE_OPT_DONE;
+}
+
+int parse_options_end(struct parse_opt_ctx_t *ctx)
+{
+        memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
+        ctx->out[ctx->cpidx + ctx->argc] = NULL;
+        return ctx->cpidx + ctx->argc;
+}
+
+int parse_options(int argc, const char **argv, const struct option *options,
+                  const char * const usagestr[], int flags)
+{
+        struct parse_opt_ctx_t ctx;
+
+        parse_options_start(&ctx, argc, argv, flags);
+        switch (parse_options_step(&ctx, options, usagestr)) {
+        case PARSE_OPT_HELP:
+                exit(129);
+        case PARSE_OPT_DONE:
+                break;
+        default: /* PARSE_OPT_UNKNOWN */
+                if (ctx.argv[0][1] == '-') {
+                        error("unknown option `%s'", ctx.argv[0] + 2);
+                } else {
+                        error("unknown switch `%c'", *ctx.opt);
+                }
+                usage_with_options(usagestr, options);
+        }
+
+        return parse_options_end(&ctx);
+}
+
+#define USAGE_OPTS_WIDTH 24
+#define USAGE_GAP         2
+
+int usage_with_options_internal(const char * const *usagestr,
+                                const struct option *opts, int full)
+{
+        if (!usagestr)
+                return PARSE_OPT_HELP;
+
+        fprintf(stderr, "usage: %s\n", *usagestr++);
+        while (*usagestr && **usagestr)
+                fprintf(stderr, "   or: %s\n", *usagestr++);
+        while (*usagestr) {
+                fprintf(stderr, "%s%s\n",
+                                **usagestr ? "    " : "",
+                                *usagestr);
+                usagestr++;
+        }
+
+        if (opts->type != OPTION_GROUP)
+                fputc('\n', stderr);
+
+        for (; opts->type != OPTION_END; opts++) {
+                size_t pos;
+                int pad;
+
+                if (opts->type == OPTION_GROUP) {
+                        fputc('\n', stderr);
+                        if (*opts->help)
+                                fprintf(stderr, "%s\n", opts->help);
+                        continue;
+                }
+                if (!full && (opts->flags & PARSE_OPT_HIDDEN))
+                        continue;
+
+                pos = fprintf(stderr, "    ");
+                if (opts->short_name)
+                        pos += fprintf(stderr, "-%c", opts->short_name);
+                if (opts->long_name && opts->short_name)
+                        pos += fprintf(stderr, ", ");
+                if (opts->long_name)
+                        pos += fprintf(stderr, "--%s", opts->long_name);
+
+                switch (opts->type) {
+                case OPTION_ARGUMENT:
+                        break;
+                case OPTION_INTEGER:
+                        if (opts->flags & PARSE_OPT_OPTARG)
+                                if (opts->long_name)
+                                        pos += fprintf(stderr, "[=<n>]");
+                                else
+                                        pos += fprintf(stderr, "[<n>]");
+                        else
+                                pos += fprintf(stderr, " <n>");
+                        break;
+                case OPTION_CALLBACK:
+                        if (opts->flags & PARSE_OPT_NOARG)
+                                break;
+                        /* FALLTHROUGH */
+                case OPTION_STRING:
+                        if (opts->argh) {
+                                if (opts->flags & PARSE_OPT_OPTARG)
+                                        if (opts->long_name)
+                                                pos += fprintf(stderr, "[=<%s>]", opts->argh);
+                                        else
+                                                pos += fprintf(stderr, "[<%s>]", opts->argh);
+                                else
+                                        pos += fprintf(stderr, " <%s>", opts->argh);
+                        } else {
+                                if (opts->flags & PARSE_OPT_OPTARG)
+                                        if (opts->long_name)
+                                                pos += fprintf(stderr, "[=...]");
+                                        else
+                                                pos += fprintf(stderr, "[...]");
+                                else
+                                        pos += fprintf(stderr, " ...");
+                        }
+                        break;
+                default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
+                        break;
+                }
+
+                if (pos <= USAGE_OPTS_WIDTH)
+                        pad = USAGE_OPTS_WIDTH - pos;
+                else {
+                        fputc('\n', stderr);
+                        pad = USAGE_OPTS_WIDTH;
+                }
+                fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
+        }
+        fputc('\n', stderr);
+
+        return PARSE_OPT_HELP;
+}
+
+void usage_with_options(const char * const *usagestr,
+                        const struct option *opts)
+{
+        usage_with_options_internal(usagestr, opts, 0);
+        exit(129);
+}
+
+int parse_options_usage(const char * const *usagestr,
+                        const struct option *opts)
+{
+        return usage_with_options_internal(usagestr, opts, 0);
+}
+
+
+/*----- some often used options -----*/
+#include "cache.h"
+
+int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
+                           int unset)
+{
+        int *target = opt->value;
+
+        if (unset)
+                /* --no-quiet, --no-verbose */
+                *target = 0;
+        else if (opt->short_name == 'v') {
+                if (*target >= 0)
+                        (*target)++;
+                else
+                        *target = 1;
+        } else {
+                if (*target <= 0)
+                        (*target)--;
+                else
+                        *target = -1;
+        }
+        return 0;
+}
diff --git a/Documentation/perf_counter/parse-options.h b/Documentation/perf_counter/parse-options.h
new file mode 100644
index 000000000000..a81c7faff68e
--- /dev/null
+++ b/Documentation/perf_counter/parse-options.h
@@ -0,0 +1,172 @@
+#ifndef PARSE_OPTIONS_H
+#define PARSE_OPTIONS_H
+
+enum parse_opt_type {
+        /* special types */
+        OPTION_END,
+        OPTION_ARGUMENT,
+        OPTION_GROUP,
+        /* options with no arguments */
+        OPTION_BIT,
+        OPTION_BOOLEAN, /* _INCR would have been a better name */
+        OPTION_SET_INT,
+        OPTION_SET_PTR,
+        /* options with arguments (usually) */
+        OPTION_STRING,
+        OPTION_INTEGER,
+        OPTION_CALLBACK,
+};
+
+enum parse_opt_flags {
+        PARSE_OPT_KEEP_DASHDASH = 1,
+        PARSE_OPT_STOP_AT_NON_OPTION = 2,
+        PARSE_OPT_KEEP_ARGV0 = 4,
+        PARSE_OPT_KEEP_UNKNOWN = 8,
+        PARSE_OPT_NO_INTERNAL_HELP = 16,
+};
+
+enum parse_opt_option_flags {
+        PARSE_OPT_OPTARG  = 1,
+        PARSE_OPT_NOARG   = 2,
+        PARSE_OPT_NONEG   = 4,
+        PARSE_OPT_HIDDEN  = 8,
+        PARSE_OPT_LASTARG_DEFAULT = 16,
+};
+
+struct option;
+typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
+
+/*
+ * `type`::
+ *   holds the type of the option, you must have an OPTION_END last in your
+ *   array.
+ *
+ * `short_name`::
+ *   the character to use as a short option name, '\0' if none.
+ *
+ * `long_name`::
+ *   the long option name, without the leading dashes, NULL if none.
+ *
+ * `value`::
+ *   stores pointers to the values to be filled.
+ *
+ * `argh`::
+ *   token to explain the kind of argument this option wants. Keep it
+ *   homogenous across the repository.
+ *
+ * `help`::
+ *   the short help associated to what the option does.
+ *   Must never be NULL (except for OPTION_END).
+ *   OPTION_GROUP uses this pointer to store the group header.
+ *
+ * `flags`::
+ *   mask of parse_opt_option_flags.
+ *   PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
+ *   PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
+ *   PARSE_OPT_NONEG: says that this option cannot be negated
+ *   PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in
+ *                    the long one.
+ *
+ * `callback`::
+ *   pointer to the callback to use for OPTION_CALLBACK.
+ *
+ * `defval`::
+ *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
+ *   OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
+ *   the value when met.
+ *   CALLBACKS can use it like they want.
+ */
+struct option {
+        enum parse_opt_type type;
+        int short_name;
+        const char *long_name;
+        void *value;
+        const char *argh;
+        const char *help;
+
+        int flags;
+        parse_opt_cb *callback;
+        intptr_t defval;
+};
+
+#define OPT_END()                   { OPTION_END }
+#define OPT_ARGUMENT(l, h)          { OPTION_ARGUMENT, 0, (l), NULL, NULL, (h) }
+#define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
+#define OPT_BIT(s, l, v, h, b)      { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) }
+#define OPT_BOOLEAN(s, l, v, h)     { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
+#define OPT_SET_INT(s, l, v, h, i)  { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) }
+#define OPT_SET_PTR(s, l, v, h, p)  { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) }
+#define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v), NULL, (h) }
+#define OPT_STRING(s, l, v, a, h)   { OPTION_STRING,  (s), (l), (v), (a), (h) }
+#define OPT_DATE(s, l, v, h) \
+        { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \
+          parse_opt_approxidate_cb }
+#define OPT_CALLBACK(s, l, v, a, h, f) \
+        { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
+
+/* parse_options() will filter out the processed options and leave the
+ * non-option argments in argv[].
+ * Returns the number of arguments left in argv[].
+ */
+extern int parse_options(int argc, const char **argv,
+                         const struct option *options,
+                         const char * const usagestr[], int flags);
+
+extern NORETURN void usage_with_options(const char * const *usagestr,
+                                        const struct option *options);
+
+/*----- incremantal advanced APIs -----*/
+
+enum {
+        PARSE_OPT_HELP = -1,
+        PARSE_OPT_DONE,
+        PARSE_OPT_UNKNOWN,
+};
+
+/*
+ * It's okay for the caller to consume argv/argc in the usual way.
+ * Other fields of that structure are private to parse-options and should not
+ * be modified in any way.
+ */
+struct parse_opt_ctx_t {
+        const char **argv;
+        const char **out;
+        int argc, cpidx;
+        const char *opt;
+        int flags;
+};
+
+extern int parse_options_usage(const char * const *usagestr,
+                               const struct option *opts);
+
+extern void parse_options_start(struct parse_opt_ctx_t *ctx,
+                                int argc, const char **argv, int flags);
+
+extern int parse_options_step(struct parse_opt_ctx_t *ctx,
+                              const struct option *options,
+                              const char * const usagestr[]);
+
+extern int parse_options_end(struct parse_opt_ctx_t *ctx);
+
+
+/*----- some often used options -----*/
+extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
+extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
+extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
+
+#define OPT__VERBOSE(var)  OPT_BOOLEAN('v', "verbose", (var), "be verbose")
+#define OPT__QUIET(var)    OPT_BOOLEAN('q', "quiet",   (var), "be quiet")
+#define OPT__VERBOSITY(var) \
+        { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \
+          PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
+        { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \
+          PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
+#define OPT__DRY_RUN(var)  OPT_BOOLEAN('n', "dry-run", (var), "dry run")
+#define OPT__ABBREV(var)  \
+        { OPTION_CALLBACK, 0, "abbrev", (var), "n", \
+          "use <n> digits to display SHA-1s", \
+          PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
+
+extern const char *parse_options_fix_filename(const char *prefix, const char *file);
+
+#endif
diff --git a/Documentation/perf_counter/path.c b/Documentation/perf_counter/path.c
new file mode 100644
index 000000000000..891b612ec1a9
--- /dev/null
+++ b/Documentation/perf_counter/path.c
@@ -0,0 +1,392 @@
+/*
+ * I'm tired of doing "vsnprintf()" etc just to open a
+ * file, so here's a "return static buffer with printf"
+ * interface for paths.
+ *
+ * It's obviously not thread-safe. Sue me. But it's quite
+ * useful for doing things like
+ *
+ *   f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
+ *
+ * which is what it's designed for.
+ */
+#include "cache.h"
+
+static char bad_path[] = "/bad-path/";
+/*
+ * Two hacks:
+ */
+
+static char *get_perf_dir(void)
+{
+        return ".";
+}
+
+size_t strlcpy(char *dest, const char *src, size_t size)
+{
+        size_t ret = strlen(src);
+
+        if (size) {
+                size_t len = (ret >= size) ? size - 1 : ret;
+                memcpy(dest, src, len);
+                dest[len] = '\0';
+        }
+        return ret;
+}
+
+
+static char *get_pathname(void)
+{
+        static char pathname_array[4][PATH_MAX];
+        static int index;
+        return pathname_array[3 & ++index];
+}
+
+static char *cleanup_path(char *path)
+{
+        /* Clean it up */
+        if (!memcmp(path, "./", 2)) {
+                path += 2;
+                while (*path == '/')
+                        path++;
+        }
+        return path;
+}
+
+char *mksnpath(char *buf, size_t n, const char *fmt, ...)
+{
+        va_list args;
+        unsigned len;
+
+        va_start(args, fmt);
+        len = vsnprintf(buf, n, fmt, args);
+        va_end(args);
+        if (len >= n) {
+                strlcpy(buf, bad_path, n);
+                return buf;
+        }
+        return cleanup_path(buf);
+}
+
+static char *perf_vsnpath(char *buf, size_t n, const char *fmt, va_list args)
+{
+        const char *perf_dir = get_perf_dir();
+        size_t len;
+
+        len = strlen(perf_dir);
+        if (n < len + 1)
+                goto bad;
+        memcpy(buf, perf_dir, len);
+        if (len && !is_dir_sep(perf_dir[len-1]))
+                buf[len++] = '/';
+        len += vsnprintf(buf + len, n - len, fmt, args);
+        if (len >= n)
+                goto bad;
+        return cleanup_path(buf);
+bad:
+        strlcpy(buf, bad_path, n);
+        return buf;
+}
+
+char *perf_snpath(char *buf, size_t n, const char *fmt, ...)
+{
+        va_list args;
+        va_start(args, fmt);
+        (void)perf_vsnpath(buf, n, fmt, args);
+        va_end(args);
+        return buf;
+}
+
+char *perf_pathdup(const char *fmt, ...)
+{
+        char path[PATH_MAX];
+        va_list args;
+        va_start(args, fmt);
+        (void)perf_vsnpath(path, sizeof(path), fmt, args);
+        va_end(args);
+        return xstrdup(path);
+}
+
+char *mkpath(const char *fmt, ...)
+{
+        va_list args;
+        unsigned len;
+        char *pathname = get_pathname();
+
+        va_start(args, fmt);
+        len = vsnprintf(pathname, PATH_MAX, fmt, args);
+        va_end(args);
+        if (len >= PATH_MAX)
+                return bad_path;
+        return cleanup_path(pathname);
+}
+
+char *perf_path(const char *fmt, ...)
+{
+        const char *perf_dir = get_perf_dir();
+        char *pathname = get_pathname();
+        va_list args;
+        unsigned len;
+
+        len = strlen(perf_dir);
+        if (len > PATH_MAX-100)
+                return bad_path;
+        memcpy(pathname, perf_dir, len);
+        if (len && perf_dir[len-1] != '/')
+                pathname[len++] = '/';
+        va_start(args, fmt);
+        len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
+        va_end(args);
+        if (len >= PATH_MAX)
+                return bad_path;
+        return cleanup_path(pathname);
+}
+
+
+/* perf_mkstemp() - create tmp file honoring TMPDIR variable */
+int perf_mkstemp(char *path, size_t len, const char *template)
+{
+        const char *tmp;
+        size_t n;
+
+        tmp = getenv("TMPDIR");
+        if (!tmp)
+                tmp = "/tmp";
+        n = snprintf(path, len, "%s/%s", tmp, template);
+        if (len <= n) {
+                errno = ENAMETOOLONG;
+                return -1;
+        }
+        return mkstemp(path);
+}
+
+
+static char *user_path(char *buf, char *path, int sz)
+{
+        struct passwd *pw;
+        char *slash;
+        int len, baselen;
+
+        if (!path || path[0] != '~')
+                return NULL;
+        path++;
+        slash = strchr(path, '/');
+        if (path[0] == '/' || !path[0]) {
+                pw = getpwuid(getuid());
+        }
+        else {
+                if (slash) {
+                        *slash = 0;
+                        pw = getpwnam(path);
+                        *slash = '/';
+                }
+                else
+                        pw = getpwnam(path);
+        }
+        if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir))
+                return NULL;
+        baselen = strlen(pw->pw_dir);
+        memcpy(buf, pw->pw_dir, baselen);
+        while ((1 < baselen) && (buf[baselen-1] == '/')) {
+                buf[baselen-1] = 0;
+                baselen--;
+        }
+        if (slash && slash[1]) {
+                len = strlen(slash);
+                if (sz <= baselen + len)
+                        return NULL;
+                memcpy(buf + baselen, slash, len + 1);
+        }
+        return buf;
+}
+
+const char *make_relative_path(const char *abs, const char *base)
+{
+        static char buf[PATH_MAX + 1];
+        int baselen;
+        if (!base)
+                return abs;
+        baselen = strlen(base);
+        if (prefixcmp(abs, base))
+                return abs;
+        if (abs[baselen] == '/')
+                baselen++;
+        else if (base[baselen - 1] != '/')
+                return abs;
+        strcpy(buf, abs + baselen);
+        return buf;
+}
+
+/*
+ * It is okay if dst == src, but they should not overlap otherwise.
+ *
+ * Performs the following normalizations on src, storing the result in dst:
+ * - Ensures that components are separated by '/' (Windows only)
+ * - Squashes sequences of '/'.
+ * - Removes "." components.
+ * - Removes ".." components, and the components the precede them.
+ * Returns failure (non-zero) if a ".." component appears as first path
+ * component anytime during the normalization. Otherwise, returns success (0).
+ *
+ * Note that this function is purely textual.  It does not follow symlinks,
+ * verify the existence of the path, or make any system calls.
+ */
+int normalize_path_copy(char *dst, const char *src)
+{
+        char *dst0;
+
+        if (has_dos_drive_prefix(src)) {
+                *dst++ = *src++;
+                *dst++ = *src++;
+        }
+        dst0 = dst;
+
+        if (is_dir_sep(*src)) {
+                *dst++ = '/';
+                while (is_dir_sep(*src))
+                        src++;
+        }
+
+        for (;;) {
+                char c = *src;
+
+                /*
+                 * A path component that begins with . could be
+                 * special:
+                 * (1) "." and ends   -- ignore and terminate.
+                 * (2) "./"           -- ignore them, eat slash and continue.
+                 * (3) ".." and ends  -- strip one and terminate.
+                 * (4) "../"          -- strip one, eat slash and continue.
+                 */
+                if (c == '.') {
+                        if (!src[1]) {
+                                /* (1) */
+                                src++;
+                        } else if (is_dir_sep(src[1])) {
+                                /* (2) */
+                                src += 2;
+                                while (is_dir_sep(*src))
+                                        src++;
+                                continue;
+                        } else if (src[1] == '.') {
+                                if (!src[2]) {
+                                        /* (3) */
+                                        src += 2;
+                                        goto up_one;
+                                } else if (is_dir_sep(src[2])) {
+                                        /* (4) */
+                                        src += 3;
+                                        while (is_dir_sep(*src))
+                                                src++;
+                                        goto up_one;
+                                }
+                        }
+                }
+
+                /* copy up to the next '/', and eat all '/' */
+                while ((c = *src++) != '\0' && !is_dir_sep(c))
+                        *dst++ = c;
+                if (is_dir_sep(c)) {
+                        *dst++ = '/';
+                        while (is_dir_sep(c))
+                                c = *src++;
+                        src--;
+                } else if (!c)
+                        break;
+                continue;
+
+        up_one:
+                /*
+                 * dst0..dst is prefix portion, and dst[-1] is '/';
+                 * go up one level.
+                 */
+                dst--;  /* go to trailing '/' */
+                if (dst <= dst0)
+                        return -1;
+                /* Windows: dst[-1] cannot be backslash anymore */
+                while (dst0 < dst && dst[-1] != '/')
+                        dst--;
+        }
+        *dst = '\0';
+        return 0;
+}
+
+/*
+ * path = Canonical absolute path
+ * prefix_list = Colon-separated list of absolute paths
+ *
+ * Determines, for each path in prefix_list, whether the "prefix" really
+ * is an ancestor directory of path.  Returns the length of the longest
+ * ancestor directory, excluding any trailing slashes, or -1 if no prefix
+ * is an ancestor.  (Note that this means 0 is returned if prefix_list is
+ * "/".) "/foo" is not considered an ancestor of "/foobar".  Directories
+ * are not considered to be their own ancestors.  path must be in a
+ * canonical form: empty components, or "." or ".." components are not
+ * allowed.  prefix_list may be null, which is like "".
+ */
+int longest_ancestor_length(const char *path, const char *prefix_list)
+{
+        char buf[PATH_MAX+1];
+        const char *ceil, *colon;
+        int len, max_len = -1;
+
+        if (prefix_list == NULL || !strcmp(path, "/"))
+                return -1;
+
+        for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
+                for (colon = ceil; *colon && *colon != PATH_SEP; colon++);
+                len = colon - ceil;
+                if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
+                        continue;
+                strlcpy(buf, ceil, len+1);
+                if (normalize_path_copy(buf, buf) < 0)
+                        continue;
+                len = strlen(buf);
+                if (len > 0 && buf[len-1] == '/')
+                        buf[--len] = '\0';
+
+                if (!strncmp(path, buf, len) &&
+                    path[len] == '/' &&
+                    len > max_len) {
+                        max_len = len;
+                }
+        }
+
+        return max_len;
+}
+
+/* strip arbitrary amount of directory separators at end of path */
+static inline int chomp_trailing_dir_sep(const char *path, int len)
+{
+        while (len && is_dir_sep(path[len - 1]))
+                len--;
+        return len;
+}
+
+/*
+ * If path ends with suffix (complete path components), returns the
+ * part before suffix (sans trailing directory separators).
+ * Otherwise returns NULL.
+ */
+char *strip_path_suffix(const char *path, const char *suffix)
+{
+        int path_len = strlen(path), suffix_len = strlen(suffix);
+
+        while (suffix_len) {
+                if (!path_len)
+                        return NULL;
+
+                if (is_dir_sep(path[path_len - 1])) {
+                        if (!is_dir_sep(suffix[suffix_len - 1]))
+                                return NULL;
+                        path_len = chomp_trailing_dir_sep(path, path_len);
+                        suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
+                }
+                else if (path[--path_len] != suffix[--suffix_len])
+                        return NULL;
+        }
+
+        if (path_len && !is_dir_sep(path[path_len - 1]))
+                return NULL;
+        return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
+}
diff --git a/Documentation/perf_counter/perf.c b/Documentation/perf_counter/perf.c
new file mode 100644
index 000000000000..9256f6a16446
--- /dev/null
+++ b/Documentation/perf_counter/perf.c
@@ -0,0 +1,411 @@
+#include "builtin.h"
+#include "exec_cmd.h"
+#include "cache.h"
+//#include "quote.h"
+#include "run-command.h"
+
+const char perf_usage_string[] =
+        "perf [--version] [--exec-path[=PERF_EXEC_PATH]] [--html-path] [-p|--paginate|--no-pager] [--bare] [--perf-dir=PERF_DIR] [--work-tree=PERF_WORK_TREE] [--help] COMMAND [ARGS]";
+
+const char perf_more_info_string[] =
+        "See 'perf help COMMAND' for more information on a specific command.";
+
+static int use_pager = -1;
+struct pager_config {
+        const char *cmd;
+        int val;
+};
+
+static int pager_command_config(const char *var, const char *value, void *data)
+{
+        struct pager_config *c = data;
+        if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
+                c->val = perf_config_bool(var, value);
+        return 0;
+}
+
+/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
+int check_pager_config(const char *cmd)
+{
+        struct pager_config c;
+        c.cmd = cmd;
+        c.val = -1;
+        perf_config(pager_command_config, &c);
+        return c.val;
+}
+
+static void commit_pager_choice(void) {
+        switch (use_pager) {
+        case 0:
+                setenv("PERF_PAGER", "cat", 1);
+                break;
+        case 1:
+                /* setup_pager(); */
+                break;
+        default:
+                break;
+        }
+}
+
+static int handle_options(const char*** argv, int* argc, int* envchanged)
+{
+        int handled = 0;
+
+        while (*argc > 0) {
+                const char *cmd = (*argv)[0];
+                if (cmd[0] != '-')
+                        break;
+
+                /*
+                 * For legacy reasons, the "version" and "help"
+                 * commands can be written with "--" prepended
+                 * to make them look like flags.
+                 */
+                if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
+                        break;
+
+                /*
+                 * Check remaining flags.
+                 */
+                if (!prefixcmp(cmd, "--exec-path")) {
+                        cmd += 11;
+                        if (*cmd == '=')
+                                perf_set_argv_exec_path(cmd + 1);
+                        else {
+                                puts(perf_exec_path());
+                                exit(0);
+                        }
+                } else if (!strcmp(cmd, "--html-path")) {
+                        puts(system_path(PERF_HTML_PATH));
+                        exit(0);
+                } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
+                        use_pager = 1;
+                } else if (!strcmp(cmd, "--no-pager")) {
+                        use_pager = 0;
+                        if (envchanged)
+                                *envchanged = 1;
+                } else if (!strcmp(cmd, "--perf-dir")) {
+                        if (*argc < 2) {
+                                fprintf(stderr, "No directory given for --perf-dir.\n" );
+                                usage(perf_usage_string);
+                        }
+                        setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
+                        if (envchanged)
+                                *envchanged = 1;
+                        (*argv)++;
+                        (*argc)--;
+                        handled++;
+                } else if (!prefixcmp(cmd, "--perf-dir=")) {
+                        setenv(PERF_DIR_ENVIRONMENT, cmd + 10, 1);
+                        if (envchanged)
+                                *envchanged = 1;
+                } else if (!strcmp(cmd, "--work-tree")) {
+                        if (*argc < 2) {
+                                fprintf(stderr, "No directory given for --work-tree.\n" );
+                                usage(perf_usage_string);
+                        }
+                        setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
+                        if (envchanged)
+                                *envchanged = 1;
+                        (*argv)++;
+                        (*argc)--;
+                } else if (!prefixcmp(cmd, "--work-tree=")) {
+                        setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
+                        if (envchanged)
+                                *envchanged = 1;
+                } else {
+                        fprintf(stderr, "Unknown option: %s\n", cmd);
+                        usage(perf_usage_string);
+                }
+
+                (*argv)++;
+                (*argc)--;
+                handled++;
+        }
+        return handled;
+}
+
+static int handle_alias(int *argcp, const char ***argv)
+{
+        int envchanged = 0, ret = 0, saved_errno = errno;
+        int count, option_count;
+        const char** new_argv;
+        const char *alias_command;
+        char *alias_string;
+        int unused_nonperf;
+
+        alias_command = (*argv)[0];
+        alias_string = alias_lookup(alias_command);
+        if (alias_string) {
+                if (alias_string[0] == '!') {
+                        if (*argcp > 1) {
+                                struct strbuf buf;
+
+                                strbuf_init(&buf, PATH_MAX);
+                                strbuf_addstr(&buf, alias_string);
+                                sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
+                                free(alias_string);
+                                alias_string = buf.buf;
+                        }
+                        ret = system(alias_string + 1);
+                        if (ret >= 0 && WIFEXITED(ret) &&
+                            WEXITSTATUS(ret) != 127)
+                                exit(WEXITSTATUS(ret));
+                        die("Failed to run '%s' when expanding alias '%s'",
+                            alias_string + 1, alias_command);
+                }
+                count = split_cmdline(alias_string, &new_argv);
+                if (count < 0)
+                        die("Bad alias.%s string", alias_command);
+                option_count = handle_options(&new_argv, &count, &envchanged);
+                if (envchanged)
+                        die("alias '%s' changes environment variables\n"
+                                 "You can use '!perf' in the alias to do this.",
+                                 alias_command);
+                memmove(new_argv - option_count, new_argv,
+                                count * sizeof(char *));
+                new_argv -= option_count;
+
+                if (count < 1)
+                        die("empty alias for %s", alias_command);
+
+                if (!strcmp(alias_command, new_argv[0]))
+                        die("recursive alias: %s", alias_command);
+
+                new_argv = realloc(new_argv, sizeof(char*) *
+                                    (count + *argcp + 1));
+                /* insert after command name */
+                memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
+                new_argv[count+*argcp] = NULL;
+
+                *argv = new_argv;
+                *argcp += count - 1;
+
+                ret = 1;
+        }
+
+        errno = saved_errno;
+
+        return ret;
+}
+
+const char perf_version_string[] = PERF_VERSION;
+
+#define RUN_SETUP       (1<<0)
+#define USE_PAGER       (1<<1)
+/*
+ * require working tree to be present -- anything uses this needs
+ * RUN_SETUP for reading from the configuration file.
+ */
+#define NEED_WORK_TREE  (1<<2)
+
+struct cmd_struct {
+        const char *cmd;
+        int (*fn)(int, const char **, const char *);
+        int option;
+};
+
+static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
+{
+        int status;
+        struct stat st;
+        const char *prefix;
+
+        prefix = NULL;
+        if (p->option & RUN_SETUP)
+                prefix = NULL; /* setup_perf_directory(); */
+
+        if (use_pager == -1 && p->option & RUN_SETUP)
+                use_pager = check_pager_config(p->cmd);
+        if (use_pager == -1 && p->option & USE_PAGER)
+                use_pager = 1;
+        commit_pager_choice();
+
+        if (p->option & NEED_WORK_TREE)
+                /* setup_work_tree() */;
+
+        status = p->fn(argc, argv, prefix);
+        if (status)
+                return status & 0xff;
+
+        /* Somebody closed stdout? */
+        if (fstat(fileno(stdout), &st))
+                return 0;
+        /* Ignore write errors for pipes and sockets.. */
+        if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
+                return 0;
+
+        /* Check for ENOSPC and EIO errors.. */
+        if (fflush(stdout))
+                die("write failure on standard output: %s", strerror(errno));
+        if (ferror(stdout))
+                die("unknown write failure on standard output");
+        if (fclose(stdout))
+                die("close failed on standard output: %s", strerror(errno));
+        return 0;
+}
+
+static void handle_internal_command(int argc, const char **argv)
+{
+        const char *cmd = argv[0];
+        static struct cmd_struct commands[] = {
+                { "top", cmd_top, 0 },
+        };
+        int i;
+        static const char ext[] = STRIP_EXTENSION;
+
+        if (sizeof(ext) > 1) {
+                i = strlen(argv[0]) - strlen(ext);
+                if (i > 0 && !strcmp(argv[0] + i, ext)) {
+                        char *argv0 = strdup(argv[0]);
+                        argv[0] = cmd = argv0;
+                        argv0[i] = '\0';
+                }
+        }
+
+        /* Turn "perf cmd --help" into "perf help cmd" */
+        if (argc > 1 && !strcmp(argv[1], "--help")) {
+                argv[1] = argv[0];
+                argv[0] = cmd = "help";
+        }
+
+        for (i = 0; i < ARRAY_SIZE(commands); i++) {
+                struct cmd_struct *p = commands+i;
+                if (strcmp(p->cmd, cmd))
+                        continue;
+                exit(run_builtin(p, argc, argv));
+        }
+}
+
+static void execv_dashed_external(const char **argv)
+{
+        struct strbuf cmd = STRBUF_INIT;
+        const char *tmp;
+        int status;
+
+        strbuf_addf(&cmd, "perf-%s", argv[0]);
+
+        /*
+         * argv[0] must be the perf command, but the argv array
+         * belongs to the caller, and may be reused in
+         * subsequent loop iterations. Save argv[0] and
+         * restore it on error.
+         */
+        tmp = argv[0];
+        argv[0] = cmd.buf;
+
+        /*
+         * if we fail because the command is not found, it is
+         * OK to return. Otherwise, we just pass along the status code.
+         */
+        status = run_command_v_opt(argv, 0);
+        if (status != -ERR_RUN_COMMAND_EXEC) {
+                if (IS_RUN_COMMAND_ERR(status))
+                        die("unable to run '%s'", argv[0]);
+                exit(-status);
+        }
+        errno = ENOENT; /* as if we called execvp */
+
+        argv[0] = tmp;
+
+        strbuf_release(&cmd);
+}
+
+static int run_argv(int *argcp, const char ***argv)
+{
+        int done_alias = 0;
+
+        while (1) {
+                /* See if it's an internal command */
+                handle_internal_command(*argcp, *argv);
+
+                /* .. then try the external ones */
+                execv_dashed_external(*argv);
+
+                /* It could be an alias -- this works around the insanity
+                 * of overriding "perf log" with "perf show" by having
+                 * alias.log = show
+                 */
+                if (done_alias || !handle_alias(argcp, argv))
+                        break;
+                done_alias = 1;
+        }
+
+        return done_alias;
+}
+
+
+int main(int argc, const char **argv)
+{
+        const char *cmd;
+
+        cmd = perf_extract_argv0_path(argv[0]);
+        if (!cmd)
+                cmd = "perf-help";
+
+        /*
+         * "perf-xxxx" is the same as "perf xxxx", but we obviously:
+         *
+         *  - cannot take flags in between the "perf" and the "xxxx".
+         *  - cannot execute it externally (since it would just do
+         *    the same thing over again)
+         *
+         * So we just directly call the internal command handler, and
+         * die if that one cannot handle it.
+         */
+        if (!prefixcmp(cmd, "perf-")) {
+                cmd += 4;
+                argv[0] = cmd;
+                handle_internal_command(argc, argv);
+                die("cannot handle %s internally", cmd);
+        }
+
+        /* Look for flags.. */
+        argv++;
+        argc--;
+        handle_options(&argv, &argc, NULL);
+        commit_pager_choice();
+        if (argc > 0) {
+                if (!prefixcmp(argv[0], "--"))
+                        argv[0] += 2;
+        } else {
+                /* The user didn't specify a command; give them help */
+                printf("usage: %s\n\n", perf_usage_string);
+                list_common_cmds_help();
+                printf("\n%s\n", perf_more_info_string);
+                exit(1);
+        }
+        cmd = argv[0];
+
+        /*
+         * We use PATH to find perf commands, but we prepend some higher
+         * precidence paths: the "--exec-path" option, the PERF_EXEC_PATH
+         * environment, and the $(perfexecdir) from the Makefile at build
+         * time.
+         */
+        setup_path();
+
+        while (1) {
+                static int done_help = 0;
+                static int was_alias = 0;
+                was_alias = run_argv(&argc, &argv);
+                if (errno != ENOENT)
+                        break;
+                if (was_alias) {
+                        fprintf(stderr, "Expansion of alias '%s' failed; "
+                                "'%s' is not a perf-command\n",
+                                cmd, argv[0]);
+                        exit(1);
+                }
+                if (!done_help) {
+                        cmd = argv[0] = help_unknown_cmd(cmd);
+                        done_help = 1;
+                } else
+                        break;
+        }
+
+        fprintf(stderr, "Failed to run command '%s': %s\n",
+                cmd, strerror(errno));
+
+        return 1;
+}
diff --git a/Documentation/perf_counter/quote.c b/Documentation/perf_counter/quote.c
new file mode 100644
index 000000000000..7a49fcf69671
--- /dev/null
+++ b/Documentation/perf_counter/quote.c
@@ -0,0 +1,478 @@
+#include "cache.h"
+#include "quote.h"
+
+int quote_path_fully = 1;
+
+/* Help to copy the thing properly quoted for the shell safety.
+ * any single quote is replaced with '\'', any exclamation point
+ * is replaced with '\!', and the whole thing is enclosed in a
+ *
+ * E.g.
+ *  original     sq_quote     result
+ *  name     ==> name      ==> 'name'
+ *  a b      ==> a b       ==> 'a b'
+ *  a'b      ==> a'\''b    ==> 'a'\''b'
+ *  a!b      ==> a'\!'b    ==> 'a'\!'b'
+ */
+static inline int need_bs_quote(char c)
+{
+        return (c == '\'' || c == '!');
+}
+
+void sq_quote_buf(struct strbuf *dst, const char *src)
+{
+        char *to_free = NULL;
+
+        if (dst->buf == src)
+                to_free = strbuf_detach(dst, NULL);
+
+        strbuf_addch(dst, '\'');
+        while (*src) {
+                size_t len = strcspn(src, "'!");
+                strbuf_add(dst, src, len);
+                src += len;
+                while (need_bs_quote(*src)) {
+                        strbuf_addstr(dst, "'\\");
+                        strbuf_addch(dst, *src++);
+                        strbuf_addch(dst, '\'');
+                }
+        }
+        strbuf_addch(dst, '\'');
+        free(to_free);
+}
+
+void sq_quote_print(FILE *stream, const char *src)
+{
+        char c;
+
+        fputc('\'', stream);
+        while ((c = *src++)) {
+                if (need_bs_quote(c)) {
+                        fputs("'\\", stream);
+                        fputc(c, stream);
+                        fputc('\'', stream);
+                } else {
+                        fputc(c, stream);
+                }
+        }
+        fputc('\'', stream);
+}
+
+void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
+{
+        int i;
+
+        /* Copy into destination buffer. */
+        strbuf_grow(dst, 255);
+        for (i = 0; argv[i]; ++i) {
+                strbuf_addch(dst, ' ');
+                sq_quote_buf(dst, argv[i]);
+                if (maxlen && dst->len > maxlen)
+                        die("Too many or long arguments");
+        }
+}
+
+char *sq_dequote_step(char *arg, char **next)
+{
+        char *dst = arg;
+        char *src = arg;
+        char c;
+
+        if (*src != '\'')
+                return NULL;
+        for (;;) {
+                c = *++src;
+                if (!c)
+                        return NULL;
+                if (c != '\'') {
+                        *dst++ = c;
+                        continue;
+                }
+                /* We stepped out of sq */
+                switch (*++src) {
+                case '\0':
+                        *dst = 0;
+                        if (next)
+                                *next = NULL;
+                        return arg;
+                case '\\':
+                        c = *++src;
+                        if (need_bs_quote(c) && *++src == '\'') {
+                                *dst++ = c;
+                                continue;
+                        }
+                /* Fallthrough */
+                default:
+                        if (!next || !isspace(*src))
+                                return NULL;
+                        do {
+                                c = *++src;
+                        } while (isspace(c));
+                        *dst = 0;
+                        *next = src;
+                        return arg;
+                }
+        }
+}
+
+char *sq_dequote(char *arg)
+{
+        return sq_dequote_step(arg, NULL);
+}
+
+int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc)
+{
+        char *next = arg;
+
+        if (!*arg)
+                return 0;
+        do {
+                char *dequoted = sq_dequote_step(next, &next);
+                if (!dequoted)
+                        return -1;
+                ALLOC_GROW(*argv, *nr + 1, *alloc);
+                (*argv)[(*nr)++] = dequoted;
+        } while (next);
+
+        return 0;
+}
+
+/* 1 means: quote as octal
+ * 0 means: quote as octal if (quote_path_fully)
+ * -1 means: never quote
+ * c: quote as "\\c"
+ */
+#define X8(x)   x, x, x, x, x, x, x, x
+#define X16(x)  X8(x), X8(x)
+static signed char const sq_lookup[256] = {
+        /*           0    1    2    3    4    5    6    7 */
+        /* 0x00 */   1,   1,   1,   1,   1,   1,   1, 'a',
+        /* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r',   1,   1,
+        /* 0x10 */ X16(1),
+        /* 0x20 */  -1,  -1, '"',  -1,  -1,  -1,  -1,  -1,
+        /* 0x28 */ X16(-1), X16(-1), X16(-1),
+        /* 0x58 */  -1,  -1,  -1,  -1,'\\',  -1,  -1,  -1,
+        /* 0x60 */ X16(-1), X8(-1),
+        /* 0x78 */  -1,  -1,  -1,  -1,  -1,  -1,  -1,   1,
+        /* 0x80 */ /* set to 0 */
+};
+
+static inline int sq_must_quote(char c)
+{
+        return sq_lookup[(unsigned char)c] + quote_path_fully > 0;
+}
+
+/* returns the longest prefix not needing a quote up to maxlen if positive.
+   This stops at the first \0 because it's marked as a character needing an
+   escape */
+static size_t next_quote_pos(const char *s, ssize_t maxlen)
+{
+        size_t len;
+        if (maxlen < 0) {
+                for (len = 0; !sq_must_quote(s[len]); len++);
+        } else {
+                for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++);
+        }
+        return len;
+}
+
+/*
+ * C-style name quoting.
+ *
+ * (1) if sb and fp are both NULL, inspect the input name and counts the
+ *     number of bytes that are needed to hold c_style quoted version of name,
+ *     counting the double quotes around it but not terminating NUL, and
+ *     returns it.
+ *     However, if name does not need c_style quoting, it returns 0.
+ *
+ * (2) if sb or fp are not NULL, it emits the c_style quoted version
+ *     of name, enclosed with double quotes if asked and needed only.
+ *     Return value is the same as in (1).
+ */
+static size_t quote_c_style_counted(const char *name, ssize_t maxlen,
+                                    struct strbuf *sb, FILE *fp, int no_dq)
+{
+#undef EMIT
+#define EMIT(c)                                 \
+        do {                                        \
+                if (sb) strbuf_addch(sb, (c));          \
+                if (fp) fputc((c), fp);                 \
+                count++;                                \
+        } while (0)
+#define EMITBUF(s, l)                           \
+        do {                                        \
+                if (sb) strbuf_add(sb, (s), (l));       \
+                if (fp) fwrite((s), (l), 1, fp);        \
+                count += (l);                           \
+        } while (0)
+
+        size_t len, count = 0;
+        const char *p = name;
+
+        for (;;) {
+                int ch;
+
+                len = next_quote_pos(p, maxlen);
+                if (len == maxlen || !p[len])
+                        break;
+
+                if (!no_dq && p == name)
+                        EMIT('"');
+
+                EMITBUF(p, len);
+                EMIT('\\');
+                p += len;
+                ch = (unsigned char)*p++;
+                if (sq_lookup[ch] >= ' ') {
+                        EMIT(sq_lookup[ch]);
+                } else {
+                        EMIT(((ch >> 6) & 03) + '0');
+                        EMIT(((ch >> 3) & 07) + '0');
+                        EMIT(((ch >> 0) & 07) + '0');
+                }
+        }
+
+        EMITBUF(p, len);
+        if (p == name)   /* no ending quote needed */
+                return 0;
+
+        if (!no_dq)
+                EMIT('"');
+        return count;
+}
+
+size_t quote_c_style(const char *name, struct strbuf *sb, FILE *fp, int nodq)
+{
+        return quote_c_style_counted(name, -1, sb, fp, nodq);
+}
+
+void quote_two_c_style(struct strbuf *sb, const char *prefix, const char *path, int nodq)
+{
+        if (quote_c_style(prefix, NULL, NULL, 0) ||
+            quote_c_style(path, NULL, NULL, 0)) {
+                if (!nodq)
+                        strbuf_addch(sb, '"');
+                quote_c_style(prefix, sb, NULL, 1);
+                quote_c_style(path, sb, NULL, 1);
+                if (!nodq)
+                        strbuf_addch(sb, '"');
+        } else {
+                strbuf_addstr(sb, prefix);
+                strbuf_addstr(sb, path);
+        }
+}
+
+void write_name_quoted(const char *name, FILE *fp, int terminator)
+{
+        if (terminator) {
+                quote_c_style(name, NULL, fp, 0);
+        } else {
+                fputs(name, fp);
+        }
+        fputc(terminator, fp);
+}
+
+extern void write_name_quotedpfx(const char *pfx, size_t pfxlen,
+                                 const char *name, FILE *fp, int terminator)
+{
+        int needquote = 0;
+
+        if (terminator) {
+                needquote = next_quote_pos(pfx, pfxlen) < pfxlen
+                        || name[next_quote_pos(name, -1)];
+        }
+        if (needquote) {
+                fputc('"', fp);
+                quote_c_style_counted(pfx, pfxlen, NULL, fp, 1);
+                quote_c_style(name, NULL, fp, 1);
+                fputc('"', fp);
+        } else {
+                fwrite(pfx, pfxlen, 1, fp);
+                fputs(name, fp);
+        }
+        fputc(terminator, fp);
+}
+
+/* quote path as relative to the given prefix */
+char *quote_path_relative(const char *in, int len,
+                          struct strbuf *out, const char *prefix)
+{
+        int needquote;
+
+        if (len < 0)
+                len = strlen(in);
+
+        /* "../" prefix itself does not need quoting, but "in" might. */
+        needquote = next_quote_pos(in, len) < len;
+        strbuf_setlen(out, 0);
+        strbuf_grow(out, len);
+
+        if (needquote)
+                strbuf_addch(out, '"');
+        if (prefix) {
+                int off = 0;
+                while (prefix[off] && off < len && prefix[off] == in[off])
+                        if (prefix[off] == '/') {
+                                prefix += off + 1;
+                                in += off + 1;
+                                len -= off + 1;
+                                off = 0;
+                        } else
+                                off++;
+
+                for (; *prefix; prefix++)
+                        if (*prefix == '/')
+                                strbuf_addstr(out, "../");
+        }
+
+        quote_c_style_counted (in, len, out, NULL, 1);
+
+        if (needquote)
+                strbuf_addch(out, '"');
+        if (!out->len)
+                strbuf_addstr(out, "./");
+
+        return out->buf;
+}
+
+/*
+ * C-style name unquoting.
+ *
+ * Quoted should point at the opening double quote.
+ * + Returns 0 if it was able to unquote the string properly, and appends the
+ *   result in the strbuf `sb'.
+ * + Returns -1 in case of error, and doesn't touch the strbuf. Though note
+ *   that this function will allocate memory in the strbuf, so calling
+ *   strbuf_release is mandatory whichever result unquote_c_style returns.
+ *
+ * Updates endp pointer to point at one past the ending double quote if given.
+ */
+int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp)
+{
+        size_t oldlen = sb->len, len;
+        int ch, ac;
+
+        if (*quoted++ != '"')
+                return -1;
+
+        for (;;) {
+                len = strcspn(quoted, "\"\\");
+                strbuf_add(sb, quoted, len);
+                quoted += len;
+
+                switch (*quoted++) {
+                  case '"':
+                        if (endp)
+                                *endp = quoted;
+                        return 0;
+                  case '\\':
+                        break;
+                  default:
+                        goto error;
+                }
+
+                switch ((ch = *quoted++)) {
+                case 'a': ch = '\a'; break;
+                case 'b': ch = '\b'; break;
+                case 'f': ch = '\f'; break;
+                case 'n': ch = '\n'; break;
+                case 'r': ch = '\r'; break;
+                case 't': ch = '\t'; break;
+                case 'v': ch = '\v'; break;
+
+                case '\\': case '"':
+                        break; /* verbatim */
+
+                /* octal values with first digit over 4 overflow */
+                case '0': case '1': case '2': case '3':
+                                        ac = ((ch - '0') << 6);
+                        if ((ch = *quoted++) < '0' || '7' < ch)
+                                goto error;
+                                        ac |= ((ch - '0') << 3);
+                        if ((ch = *quoted++) < '0' || '7' < ch)
+                                goto error;
+                                        ac |= (ch - '0');
+                                        ch = ac;
+                                        break;
+                                default:
+                        goto error;
+                        }
+                strbuf_addch(sb, ch);
+                }
+
+  error:
+        strbuf_setlen(sb, oldlen);
+        return -1;
+}
+
+/* quoting as a string literal for other languages */
+
+void perl_quote_print(FILE *stream, const char *src)
+{
+        const char sq = '\'';
+        const char bq = '\\';
+        char c;
+
+        fputc(sq, stream);
+        while ((c = *src++)) {
+                if (c == sq || c == bq)
+                        fputc(bq, stream);
+                fputc(c, stream);
+        }
+        fputc(sq, stream);
+}
+
+void python_quote_print(FILE *stream, const char *src)
+{
+        const char sq = '\'';
+        const char bq = '\\';
+        const char nl = '\n';
+        char c;
+
+        fputc(sq, stream);
+        while ((c = *src++)) {
+                if (c == nl) {
+                        fputc(bq, stream);
+                        fputc('n', stream);
+                        continue;
+                }
+                if (c == sq || c == bq)
+                        fputc(bq, stream);
+                fputc(c, stream);
+        }
+        fputc(sq, stream);
+}
+
+void tcl_quote_print(FILE *stream, const char *src)
+{
+        char c;
+
+        fputc('"', stream);
+        while ((c = *src++)) {
+                switch (c) {
+                case '[': case ']':
+                case '{': case '}':
+                case '$': case '\\': case '"':
+                        fputc('\\', stream);
+                default:
+                        fputc(c, stream);
+                        break;
+                case '\f':
+                        fputs("\\f", stream);
+                        break;
+                case '\r':
+                        fputs("\\r", stream);
+                        break;
+                case '\n':
+                        fputs("\\n", stream);
+                        break;
+                case '\t':
+                        fputs("\\t", stream);
+                        break;
+                case '\v':
+                        fputs("\\v", stream);
+                        break;
+                }
+        }
+        fputc('"', stream);
+}
diff --git a/Documentation/perf_counter/quote.h b/Documentation/perf_counter/quote.h
new file mode 100644
index 000000000000..66730f2bff3c
--- /dev/null
+++ b/Documentation/perf_counter/quote.h
@@ -0,0 +1,68 @@
+#ifndef QUOTE_H
+#define QUOTE_H
+
+#include <stddef.h>
+#include <stdio.h>
+
+/* Help to copy the thing properly quoted for the shell safety.
+ * any single quote is replaced with '\'', any exclamation point
+ * is replaced with '\!', and the whole thing is enclosed in a
+ * single quote pair.
+ *
+ * For example, if you are passing the result to system() as an
+ * argument:
+ *
+ * sprintf(cmd, "foobar %s %s", sq_quote(arg0), sq_quote(arg1))
+ *
+ * would be appropriate.  If the system() is going to call ssh to
+ * run the command on the other side:
+ *
+ * sprintf(cmd, "git-diff-tree %s %s", sq_quote(arg0), sq_quote(arg1));
+ * sprintf(rcmd, "ssh %s %s", sq_quote(host), sq_quote(cmd));
+ *
+ * Note that the above examples leak memory!  Remember to free result from
+ * sq_quote() in a real application.
+ *
+ * sq_quote_buf() writes to an existing buffer of specified size; it
+ * will return the number of characters that would have been written
+ * excluding the final null regardless of the buffer size.
+ */
+
+extern void sq_quote_print(FILE *stream, const char *src);
+
+extern void sq_quote_buf(struct strbuf *, const char *src);
+extern void sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
+
+/* This unwraps what sq_quote() produces in place, but returns
+ * NULL if the input does not look like what sq_quote would have
+ * produced.
+ */
+extern char *sq_dequote(char *);
+
+/*
+ * Same as the above, but can be used to unwrap many arguments in the
+ * same string separated by space. "next" is changed to point to the
+ * next argument that should be passed as first parameter. When there
+ * is no more argument to be dequoted, "next" is updated to point to NULL.
+ */
+extern char *sq_dequote_step(char *arg, char **next);
+extern int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc);
+
+extern int unquote_c_style(struct strbuf *, const char *quoted, const char **endp);
+extern size_t quote_c_style(const char *name, struct strbuf *, FILE *, int no_dq);
+extern void quote_two_c_style(struct strbuf *, const char *, const char *, int);
+
+extern void write_name_quoted(const char *name, FILE *, int terminator);
+extern void write_name_quotedpfx(const char *pfx, size_t pfxlen,
+                                 const char *name, FILE *, int terminator);
+
+/* quote path as relative to the given prefix */
+char *quote_path_relative(const char *in, int len,
+                          struct strbuf *out, const char *prefix);
+
+/* quoting as a string literal for other languages */
+extern void perl_quote_print(FILE *stream, const char *src);
+extern void python_quote_print(FILE *stream, const char *src);
+extern void tcl_quote_print(FILE *stream, const char *src);
+
+#endif
diff --git a/Documentation/perf_counter/run-command.c b/Documentation/perf_counter/run-command.c
new file mode 100644
index 000000000000..b2f5e854f40a
--- /dev/null
+++ b/Documentation/perf_counter/run-command.c
@@ -0,0 +1,395 @@
+#include "cache.h"
+#include "run-command.h"
+#include "exec_cmd.h"
+
+static inline void close_pair(int fd[2])
+{
+        close(fd[0]);
+        close(fd[1]);
+}
+
+static inline void dup_devnull(int to)
+{
+        int fd = open("/dev/null", O_RDWR);
+        dup2(fd, to);
+        close(fd);
+}
+
+int start_command(struct child_process *cmd)
+{
+        int need_in, need_out, need_err;
+        int fdin[2], fdout[2], fderr[2];
+
+        /*
+         * In case of errors we must keep the promise to close FDs
+         * that have been passed in via ->in and ->out.
+         */
+
+        need_in = !cmd->no_stdin && cmd->in < 0;
+        if (need_in) {
+                if (pipe(fdin) < 0) {
+                        if (cmd->out > 0)
+                                close(cmd->out);
+                        return -ERR_RUN_COMMAND_PIPE;
+                }
+                cmd->in = fdin[1];
+        }
+
+        need_out = !cmd->no_stdout
+                && !cmd->stdout_to_stderr
+                && cmd->out < 0;
+        if (need_out) {
+                if (pipe(fdout) < 0) {
+                        if (need_in)
+                                close_pair(fdin);
+                        else if (cmd->in)
+                                close(cmd->in);
+                        return -ERR_RUN_COMMAND_PIPE;
+                }
+                cmd->out = fdout[0];
+        }
+
+        need_err = !cmd->no_stderr && cmd->err < 0;
+        if (need_err) {
+                if (pipe(fderr) < 0) {
+                        if (need_in)
+                                close_pair(fdin);
+                        else if (cmd->in)
+                                close(cmd->in);
+                        if (need_out)
+                                close_pair(fdout);
+                        else if (cmd->out)
+                                close(cmd->out);
+                        return -ERR_RUN_COMMAND_PIPE;
+                }
+                cmd->err = fderr[0];
+        }
+
+#ifndef __MINGW32__
+        fflush(NULL);
+        cmd->pid = fork();
+        if (!cmd->pid) {
+                if (cmd->no_stdin)
+                        dup_devnull(0);
+                else if (need_in) {
+                        dup2(fdin[0], 0);
+                        close_pair(fdin);
+                } else if (cmd->in) {
+                        dup2(cmd->in, 0);
+                        close(cmd->in);
+                }
+
+                if (cmd->no_stderr)
+                        dup_devnull(2);
+                else if (need_err) {
+                        dup2(fderr[1], 2);
+                        close_pair(fderr);
+                }
+
+                if (cmd->no_stdout)
+                        dup_devnull(1);
+                else if (cmd->stdout_to_stderr)
+                        dup2(2, 1);
+                else if (need_out) {
+                        dup2(fdout[1], 1);
+                        close_pair(fdout);
+                } else if (cmd->out > 1) {
+                        dup2(cmd->out, 1);
+                        close(cmd->out);
+                }
+
+                if (cmd->dir && chdir(cmd->dir))
+                        die("exec %s: cd to %s failed (%s)", cmd->argv[0],
+                            cmd->dir, strerror(errno));
+                if (cmd->env) {
+                        for (; *cmd->env; cmd->env++) {
+                                if (strchr(*cmd->env, '='))
+                                        putenv((char*)*cmd->env);
+                                else
+                                        unsetenv(*cmd->env);
+                        }
+                }
+                if (cmd->preexec_cb)
+                        cmd->preexec_cb();
+                if (cmd->perf_cmd) {
+                        execv_perf_cmd(cmd->argv);
+                } else {
+                        execvp(cmd->argv[0], (char *const*) cmd->argv);
+                }
+                exit(127);
+        }
+#else
+        int s0 = -1, s1 = -1, s2 = -1;  /* backups of stdin, stdout, stderr */
+        const char **sargv = cmd->argv;
+        char **env = environ;
+
+        if (cmd->no_stdin) {
+                s0 = dup(0);
+                dup_devnull(0);
+        } else if (need_in) {
+                s0 = dup(0);
+                dup2(fdin[0], 0);
+        } else if (cmd->in) {
+                s0 = dup(0);
+                dup2(cmd->in, 0);
+        }
+
+        if (cmd->no_stderr) {
+                s2 = dup(2);
+                dup_devnull(2);
+        } else if (need_err) {
+                s2 = dup(2);
+                dup2(fderr[1], 2);
+        }
+
+        if (cmd->no_stdout) {
+                s1 = dup(1);
+                dup_devnull(1);
+        } else if (cmd->stdout_to_stderr) {
+                s1 = dup(1);
+                dup2(2, 1);
+        } else if (need_out) {
+                s1 = dup(1);
+                dup2(fdout[1], 1);
+        } else if (cmd->out > 1) {
+                s1 = dup(1);
+                dup2(cmd->out, 1);
+        }
+
+        if (cmd->dir)
+                die("chdir in start_command() not implemented");
+        if (cmd->env) {
+                env = copy_environ();
+                for (; *cmd->env; cmd->env++)
+                        env = env_setenv(env, *cmd->env);
+        }
+
+        if (cmd->perf_cmd) {
+                cmd->argv = prepare_perf_cmd(cmd->argv);
+        }
+
+        cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
+
+        if (cmd->env)
+                free_environ(env);
+        if (cmd->perf_cmd)
+                free(cmd->argv);
+
+        cmd->argv = sargv;
+        if (s0 >= 0)
+                dup2(s0, 0), close(s0);
+        if (s1 >= 0)
+                dup2(s1, 1), close(s1);
+        if (s2 >= 0)
+                dup2(s2, 2), close(s2);
+#endif
+
+        if (cmd->pid < 0) {
+                int err = errno;
+                if (need_in)
+                        close_pair(fdin);
+                else if (cmd->in)
+                        close(cmd->in);
+                if (need_out)
+                        close_pair(fdout);
+                else if (cmd->out)
+                        close(cmd->out);
+                if (need_err)
+                        close_pair(fderr);
+                return err == ENOENT ?
+                        -ERR_RUN_COMMAND_EXEC :
+                        -ERR_RUN_COMMAND_FORK;
+        }
+
+        if (need_in)
+                close(fdin[0]);
+        else if (cmd->in)
+                close(cmd->in);
+
+        if (need_out)
+                close(fdout[1]);
+        else if (cmd->out)
+                close(cmd->out);
+
+        if (need_err)
+                close(fderr[1]);
+
+        return 0;
+}
+
+static int wait_or_whine(pid_t pid)
+{
+        for (;;) {
+                int status, code;
+                pid_t waiting = waitpid(pid, &status, 0);
+
+                if (waiting < 0) {
+                        if (errno == EINTR)
+                                continue;
+                        error("waitpid failed (%s)", strerror(errno));
+                        return -ERR_RUN_COMMAND_WAITPID;
+                }
+                if (waiting != pid)
+                        return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
+                if (WIFSIGNALED(status))
+                        return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
+
+                if (!WIFEXITED(status))
+                        return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
+                code = WEXITSTATUS(status);
+                switch (code) {
+                case 127:
+                        return -ERR_RUN_COMMAND_EXEC;
+                case 0:
+                        return 0;
+                default:
+                        return -code;
+                }
+        }
+}
+
+int finish_command(struct child_process *cmd)
+{
+        return wait_or_whine(cmd->pid);
+}
+
+int run_command(struct child_process *cmd)
+{
+        int code = start_command(cmd);
+        if (code)
+                return code;
+        return finish_command(cmd);
+}
+
+static void prepare_run_command_v_opt(struct child_process *cmd,
+                                      const char **argv,
+                                      int opt)
+{
+        memset(cmd, 0, sizeof(*cmd));
+        cmd->argv = argv;
+        cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
+        cmd->perf_cmd = opt & RUN_PERF_CMD ? 1 : 0;
+        cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
+}
+
+int run_command_v_opt(const char **argv, int opt)
+{
+        struct child_process cmd;
+        prepare_run_command_v_opt(&cmd, argv, opt);
+        return run_command(&cmd);
+}
+
+int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
+{
+        struct child_process cmd;
+        prepare_run_command_v_opt(&cmd, argv, opt);
+        cmd.dir = dir;
+        cmd.env = env;
+        return run_command(&cmd);
+}
+
+#ifdef __MINGW32__
+static __stdcall unsigned run_thread(void *data)
+{
+        struct async *async = data;
+        return async->proc(async->fd_for_proc, async->data);
+}
+#endif
+
+int start_async(struct async *async)
+{
+        int pipe_out[2];
+
+        if (pipe(pipe_out) < 0)
+                return error("cannot create pipe: %s", strerror(errno));
+        async->out = pipe_out[0];
+
+#ifndef __MINGW32__
+        /* Flush stdio before fork() to avoid cloning buffers */
+        fflush(NULL);
+
+        async->pid = fork();
+        if (async->pid < 0) {
+                error("fork (async) failed: %s", strerror(errno));
+                close_pair(pipe_out);
+                return -1;
+        }
+        if (!async->pid) {
+                close(pipe_out[0]);
+                exit(!!async->proc(pipe_out[1], async->data));
+        }
+        close(pipe_out[1]);
+#else
+        async->fd_for_proc = pipe_out[1];
+        async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
+        if (!async->tid) {
+                error("cannot create thread: %s", strerror(errno));
+                close_pair(pipe_out);
+                return -1;
+        }
+#endif
+        return 0;
+}
+
+int finish_async(struct async *async)
+{
+#ifndef __MINGW32__
+        int ret = 0;
+
+        if (wait_or_whine(async->pid))
+                ret = error("waitpid (async) failed");
+#else
+        DWORD ret = 0;
+        if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
+                ret = error("waiting for thread failed: %lu", GetLastError());
+        else if (!GetExitCodeThread(async->tid, &ret))
+                ret = error("cannot get thread exit code: %lu", GetLastError());
+        CloseHandle(async->tid);
+#endif
+        return ret;
+}
+
+int run_hook(const char *index_file, const char *name, ...)
+{
+        struct child_process hook;
+        const char **argv = NULL, *env[2];
+        char index[PATH_MAX];
+        va_list args;
+        int ret;
+        size_t i = 0, alloc = 0;
+
+        if (access(perf_path("hooks/%s", name), X_OK) < 0)
+                return 0;
+
+        va_start(args, name);
+        ALLOC_GROW(argv, i + 1, alloc);
+        argv[i++] = perf_path("hooks/%s", name);
+        while (argv[i-1]) {
+                ALLOC_GROW(argv, i + 1, alloc);
+                argv[i++] = va_arg(args, const char *);
+        }
+        va_end(args);
+
+        memset(&hook, 0, sizeof(hook));
+        hook.argv = argv;
+        hook.no_stdin = 1;
+        hook.stdout_to_stderr = 1;
+        if (index_file) {
+                snprintf(index, sizeof(index), "PERF_INDEX_FILE=%s", index_file);
+                env[0] = index;
+                env[1] = NULL;
+                hook.env = env;
+        }
+
+        ret = start_command(&hook);
+        free(argv);
+        if (ret) {
+                warning("Could not spawn %s", argv[0]);
+                return ret;
+        }
+        ret = finish_command(&hook);
+        if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
+                warning("%s exited due to uncaught signal", argv[0]);
+
+        return ret;
+}
diff --git a/Documentation/perf_counter/run-command.h b/Documentation/perf_counter/run-command.h
new file mode 100644
index 000000000000..328289f23669
--- /dev/null
+++ b/Documentation/perf_counter/run-command.h
@@ -0,0 +1,93 @@
+#ifndef RUN_COMMAND_H
+#define RUN_COMMAND_H
+
+enum {
+        ERR_RUN_COMMAND_FORK = 10000,
+        ERR_RUN_COMMAND_EXEC,
+        ERR_RUN_COMMAND_PIPE,
+        ERR_RUN_COMMAND_WAITPID,
+        ERR_RUN_COMMAND_WAITPID_WRONG_PID,
+        ERR_RUN_COMMAND_WAITPID_SIGNAL,
+        ERR_RUN_COMMAND_WAITPID_NOEXIT,
+};
+#define IS_RUN_COMMAND_ERR(x) (-(x) >= ERR_RUN_COMMAND_FORK)
+
+struct child_process {
+        const char **argv;
+        pid_t pid;
+        /*
+         * Using .in, .out, .err:
+         * - Specify 0 for no redirections (child inherits stdin, stdout,
+         *   stderr from parent).
+         * - Specify -1 to have a pipe allocated as follows:
+         *     .in: returns the writable pipe end; parent writes to it,
+         *          the readable pipe end becomes child's stdin
+         *     .out, .err: returns the readable pipe end; parent reads from
+         *          it, the writable pipe end becomes child's stdout/stderr
+         *   The caller of start_command() must close the returned FDs
+         *   after it has completed reading from/writing to it!
+         * - Specify > 0 to set a channel to a particular FD as follows:
+         *     .in: a readable FD, becomes child's stdin
+         *     .out: a writable FD, becomes child's stdout/stderr
+         *     .err > 0 not supported
+         *   The specified FD is closed by start_command(), even in case
+         *   of errors!
+         */
+        int in;
+        int out;
+        int err;
+        const char *dir;
+        const char *const *env;
+        unsigned no_stdin:1;
+        unsigned no_stdout:1;
+        unsigned no_stderr:1;
+        unsigned perf_cmd:1; /* if this is to be perf sub-command */
+        unsigned stdout_to_stderr:1;
+        void (*preexec_cb)(void);
+};
+
+int start_command(struct child_process *);
+int finish_command(struct child_process *);
+int run_command(struct child_process *);
+
+extern int run_hook(const char *index_file, const char *name, ...);
+
+#define RUN_COMMAND_NO_STDIN 1
+#define RUN_PERF_CMD         2  /*If this is to be perf sub-command */
+#define RUN_COMMAND_STDOUT_TO_STDERR 4
+int run_command_v_opt(const char **argv, int opt);
+
+/*
+ * env (the environment) is to be formatted like environ: "VAR=VALUE".
+ * To unset an environment variable use just "VAR".
+ */
+int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
+
+/*
+ * The purpose of the following functions is to feed a pipe by running
+ * a function asynchronously and providing output that the caller reads.
+ *
+ * It is expected that no synchronization and mutual exclusion between
+ * the caller and the feed function is necessary so that the function
+ * can run in a thread without interfering with the caller.
+ */
+struct async {
+        /*
+         * proc writes to fd and closes it;
+         * returns 0 on success, non-zero on failure
+         */
+        int (*proc)(int fd, void *data);
+        void *data;
+        int out;        /* caller reads from here and closes it */
+#ifndef __MINGW32__
+        pid_t pid;
+#else
+        HANDLE tid;
+        int fd_for_proc;
+#endif
+};
+
+int start_async(struct async *async);
+int finish_async(struct async *async);
+
+#endif
diff --git a/Documentation/perf_counter/strbuf.c b/Documentation/perf_counter/strbuf.c
new file mode 100644
index 000000000000..eaba09306802
--- /dev/null
+++ b/Documentation/perf_counter/strbuf.c
@@ -0,0 +1,359 @@
+#include "cache.h"
+
+int prefixcmp(const char *str, const char *prefix)
+{
+        for (; ; str++, prefix++)
+                if (!*prefix)
+                        return 0;
+                else if (*str != *prefix)
+                        return (unsigned char)*prefix - (unsigned char)*str;
+}
+
+/*
+ * Used as the default ->buf value, so that people can always assume
+ * buf is non NULL and ->buf is NUL terminated even for a freshly
+ * initialized strbuf.
+ */
+char strbuf_slopbuf[1];
+
+void strbuf_init(struct strbuf *sb, size_t hint)
+{
+        sb->alloc = sb->len = 0;
+        sb->buf = strbuf_slopbuf;
+        if (hint)
+                strbuf_grow(sb, hint);
+}
+
+void strbuf_release(struct strbuf *sb)
+{
+        if (sb->alloc) {
+                free(sb->buf);
+                strbuf_init(sb, 0);
+        }
+}
+
+char *strbuf_detach(struct strbuf *sb, size_t *sz)
+{
+        char *res = sb->alloc ? sb->buf : NULL;
+        if (sz)
+                *sz = sb->len;
+        strbuf_init(sb, 0);
+        return res;
+}
+
+void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
+{
+        strbuf_release(sb);
+        sb->buf   = buf;
+        sb->len   = len;
+        sb->alloc = alloc;
+        strbuf_grow(sb, 0);
+        sb->buf[sb->len] = '\0';
+}
+
+void strbuf_grow(struct strbuf *sb, size_t extra)
+{
+        if (sb->len + extra + 1 <= sb->len)
+                die("you want to use way too much memory");
+        if (!sb->alloc)
+                sb->buf = NULL;
+        ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
+}
+
+void strbuf_trim(struct strbuf *sb)
+{
+        char *b = sb->buf;
+        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
+                sb->len--;
+        while (sb->len > 0 && isspace(*b)) {
+                b++;
+                sb->len--;
+        }
+        memmove(sb->buf, b, sb->len);
+        sb->buf[sb->len] = '\0';
+}
+void strbuf_rtrim(struct strbuf *sb)
+{
+        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
+                sb->len--;
+        sb->buf[sb->len] = '\0';
+}
+
+void strbuf_ltrim(struct strbuf *sb)
+{
+        char *b = sb->buf;
+        while (sb->len > 0 && isspace(*b)) {
+                b++;
+                sb->len--;
+        }
+        memmove(sb->buf, b, sb->len);
+        sb->buf[sb->len] = '\0';
+}
+
+void strbuf_tolower(struct strbuf *sb)
+{
+        int i;
+        for (i = 0; i < sb->len; i++)
+                sb->buf[i] = tolower(sb->buf[i]);
+}
+
+struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
+{
+        int alloc = 2, pos = 0;
+        char *n, *p;
+        struct strbuf **ret;
+        struct strbuf *t;
+
+        ret = calloc(alloc, sizeof(struct strbuf *));
+        p = n = sb->buf;
+        while (n < sb->buf + sb->len) {
+                int len;
+                n = memchr(n, delim, sb->len - (n - sb->buf));
+                if (pos + 1 >= alloc) {
+                        alloc = alloc * 2;
+                        ret = realloc(ret, sizeof(struct strbuf *) * alloc);
+                }
+                if (!n)
+                        n = sb->buf + sb->len - 1;
+                len = n - p + 1;
+                t = malloc(sizeof(struct strbuf));
+                strbuf_init(t, len);
+                strbuf_add(t, p, len);
+                ret[pos] = t;
+                ret[++pos] = NULL;
+                p = ++n;
+        }
+        return ret;
+}
+
+void strbuf_list_free(struct strbuf **sbs)
+{
+        struct strbuf **s = sbs;
+
+        while (*s) {
+                strbuf_release(*s);
+                free(*s++);
+        }
+        free(sbs);
+}
+
+int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
+{
+        int len = a->len < b->len ? a->len: b->len;
+        int cmp = memcmp(a->buf, b->buf, len);
+        if (cmp)
+                return cmp;
+        return a->len < b->len ? -1: a->len != b->len;
+}
+
+void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
+                                   const void *data, size_t dlen)
+{
+        if (pos + len < pos)
+                die("you want to use way too much memory");
+        if (pos > sb->len)
+                die("`pos' is too far after the end of the buffer");
+        if (pos + len > sb->len)
+                die("`pos + len' is too far after the end of the buffer");
+
+        if (dlen >= len)
+                strbuf_grow(sb, dlen - len);
+        memmove(sb->buf + pos + dlen,
+                        sb->buf + pos + len,
+                        sb->len - pos - len);
+        memcpy(sb->buf + pos, data, dlen);
+        strbuf_setlen(sb, sb->len + dlen - len);
+}
+
+void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
+{
+        strbuf_splice(sb, pos, 0, data, len);
+}
+
+void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
+{
+        strbuf_splice(sb, pos, len, NULL, 0);
+}
+
+void strbuf_add(struct strbuf *sb, const void *data, size_t len)
+{
+        strbuf_grow(sb, len);
+        memcpy(sb->buf + sb->len, data, len);
+        strbuf_setlen(sb, sb->len + len);
+}
+
+void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
+{
+        strbuf_grow(sb, len);
+        memcpy(sb->buf + sb->len, sb->buf + pos, len);
+        strbuf_setlen(sb, sb->len + len);
+}
+
+void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
+{
+        int len;
+        va_list ap;
+
+        if (!strbuf_avail(sb))
+                strbuf_grow(sb, 64);
+        va_start(ap, fmt);
+        len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
+        va_end(ap);
+        if (len < 0)
+                die("your vsnprintf is broken");
+        if (len > strbuf_avail(sb)) {
+                strbuf_grow(sb, len);
+                va_start(ap, fmt);
+                len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
+                va_end(ap);
+                if (len > strbuf_avail(sb)) {
+                        die("this should not happen, your snprintf is broken");
+                }
+        }
+        strbuf_setlen(sb, sb->len + len);
+}
+
+void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
+                   void *context)
+{
+        for (;;) {
+                const char *percent;
+                size_t consumed;
+
+                percent = strchrnul(format, '%');
+                strbuf_add(sb, format, percent - format);
+                if (!*percent)
+                        break;
+                format = percent + 1;
+
+                consumed = fn(sb, format, context);
+                if (consumed)
+                        format += consumed;
+                else
+                        strbuf_addch(sb, '%');
+        }
+}
+
+size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
+                void *context)
+{
+        struct strbuf_expand_dict_entry *e = context;
+        size_t len;
+
+        for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
+                if (!strncmp(placeholder, e->placeholder, len)) {
+                        if (e->value)
+                                strbuf_addstr(sb, e->value);
+                        return len;
+                }
+        }
+        return 0;
+}
+
+size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
+{
+        size_t res;
+        size_t oldalloc = sb->alloc;
+
+        strbuf_grow(sb, size);
+        res = fread(sb->buf + sb->len, 1, size, f);
+        if (res > 0)
+                strbuf_setlen(sb, sb->len + res);
+        else if (res < 0 && oldalloc == 0)
+                strbuf_release(sb);
+        return res;
+}
+
+ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
+{
+        size_t oldlen = sb->len;
+        size_t oldalloc = sb->alloc;
+
+        strbuf_grow(sb, hint ? hint : 8192);
+        for (;;) {
+                ssize_t cnt;
+
+                cnt = read(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
+                if (cnt < 0) {
+                        if (oldalloc == 0)
+                                strbuf_release(sb);
+                        else
+                                strbuf_setlen(sb, oldlen);
+                        return -1;
+                }
+                if (!cnt)
+                        break;
+                sb->len += cnt;
+                strbuf_grow(sb, 8192);
+        }
+
+        sb->buf[sb->len] = '\0';
+        return sb->len - oldlen;
+}
+
+#define STRBUF_MAXLINK (2*PATH_MAX)
+
+int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
+{
+        size_t oldalloc = sb->alloc;
+
+        if (hint < 32)
+                hint = 32;
+
+        while (hint < STRBUF_MAXLINK) {
+                int len;
+
+                strbuf_grow(sb, hint);
+                len = readlink(path, sb->buf, hint);
+                if (len < 0) {
+                        if (errno != ERANGE)
+                                break;
+                } else if (len < hint) {
+                        strbuf_setlen(sb, len);
+                        return 0;
+                }
+
+                /* .. the buffer was too small - try again */
+                hint *= 2;
+        }
+        if (oldalloc == 0)
+                strbuf_release(sb);
+        return -1;
+}
+
+int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
+{
+        int ch;
+
+        strbuf_grow(sb, 0);
+        if (feof(fp))
+                return EOF;
+
+        strbuf_reset(sb);
+        while ((ch = fgetc(fp)) != EOF) {
+                if (ch == term)
+                        break;
+                strbuf_grow(sb, 1);
+                sb->buf[sb->len++] = ch;
+        }
+        if (ch == EOF && sb->len == 0)
+                return EOF;
+
+        sb->buf[sb->len] = '\0';
+        return 0;
+}
+
+int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
+{
+        int fd, len;
+
+        fd = open(path, O_RDONLY);
+        if (fd < 0)
+                return -1;
+        len = strbuf_read(sb, fd, hint);
+        close(fd);
+        if (len < 0)
+                return -1;
+
+        return len;
+}
diff --git a/Documentation/perf_counter/strbuf.h b/Documentation/perf_counter/strbuf.h
new file mode 100644
index 000000000000..9ee908a3ec5d
--- /dev/null
+++ b/Documentation/perf_counter/strbuf.h
@@ -0,0 +1,137 @@
+#ifndef STRBUF_H
+#define STRBUF_H
+
+/*
+ * Strbuf's can be use in many ways: as a byte array, or to store arbitrary
+ * long, overflow safe strings.
+ *
+ * Strbufs has some invariants that are very important to keep in mind:
+ *
+ * 1. the ->buf member is always malloc-ed, hence strbuf's can be used to
+ *    build complex strings/buffers whose final size isn't easily known.
+ *
+ *    It is NOT legal to copy the ->buf pointer away.
+ *    `strbuf_detach' is the operation that detachs a buffer from its shell
+ *    while keeping the shell valid wrt its invariants.
+ *
+ * 2. the ->buf member is a byte array that has at least ->len + 1 bytes
+ *    allocated. The extra byte is used to store a '\0', allowing the ->buf
+ *    member to be a valid C-string. Every strbuf function ensure this
+ *    invariant is preserved.
+ *
+ *    Note that it is OK to "play" with the buffer directly if you work it
+ *    that way:
+ *
+ *    strbuf_grow(sb, SOME_SIZE);
+ *       ... Here, the memory array starting at sb->buf, and of length
+ *       ... strbuf_avail(sb) is all yours, and you are sure that
+ *       ... strbuf_avail(sb) is at least SOME_SIZE.
+ *    strbuf_setlen(sb, sb->len + SOME_OTHER_SIZE);
+ *
+ *    Of course, SOME_OTHER_SIZE must be smaller or equal to strbuf_avail(sb).
+ *
+ *    Doing so is safe, though if it has to be done in many places, adding the
+ *    missing API to the strbuf module is the way to go.
+ *
+ *    XXX: do _not_ assume that the area that is yours is of size ->alloc - 1
+ *         even if it's true in the current implementation. Alloc is somehow a
+ *         "private" member that should not be messed with.
+ */
+
+#include <assert.h>
+
+extern char strbuf_slopbuf[];
+struct strbuf {
+        size_t alloc;
+        size_t len;
+        char *buf;
+};
+
+#define STRBUF_INIT  { 0, 0, strbuf_slopbuf }
+
+/*----- strbuf life cycle -----*/
+extern void strbuf_init(struct strbuf *, size_t);
+extern void strbuf_release(struct strbuf *);
+extern char *strbuf_detach(struct strbuf *, size_t *);
+extern void strbuf_attach(struct strbuf *, void *, size_t, size_t);
+static inline void strbuf_swap(struct strbuf *a, struct strbuf *b) {
+        struct strbuf tmp = *a;
+        *a = *b;
+        *b = tmp;
+}
+
+/*----- strbuf size related -----*/
+static inline size_t strbuf_avail(const struct strbuf *sb) {
+        return sb->alloc ? sb->alloc - sb->len - 1 : 0;
+}
+
+extern void strbuf_grow(struct strbuf *, size_t);
+
+static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
+        if (!sb->alloc)
+                strbuf_grow(sb, 0);
+        assert(len < sb->alloc);
+        sb->len = len;
+        sb->buf[len] = '\0';
+}
+#define strbuf_reset(sb)  strbuf_setlen(sb, 0)
+
+/*----- content related -----*/
+extern void strbuf_trim(struct strbuf *);
+extern void strbuf_rtrim(struct strbuf *);
+extern void strbuf_ltrim(struct strbuf *);
+extern int strbuf_cmp(const struct strbuf *, const struct strbuf *);
+extern void strbuf_tolower(struct strbuf *);
+
+extern struct strbuf **strbuf_split(const struct strbuf *, int delim);
+extern void strbuf_list_free(struct strbuf **);
+
+/*----- add data in your buffer -----*/
+static inline void strbuf_addch(struct strbuf *sb, int c) {
+        strbuf_grow(sb, 1);
+        sb->buf[sb->len++] = c;
+        sb->buf[sb->len] = '\0';
+}
+
+extern void strbuf_insert(struct strbuf *, size_t pos, const void *, size_t);
+extern void strbuf_remove(struct strbuf *, size_t pos, size_t len);
+
+/* splice pos..pos+len with given data */
+extern void strbuf_splice(struct strbuf *, size_t pos, size_t len,
+                          const void *, size_t);
+
+extern void strbuf_add(struct strbuf *, const void *, size_t);
+static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
+        strbuf_add(sb, s, strlen(s));
+}
+static inline void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2) {
+        strbuf_add(sb, sb2->buf, sb2->len);
+}
+extern void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len);
+
+typedef size_t (*expand_fn_t) (struct strbuf *sb, const char *placeholder, void *context);
+extern void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn, void *context);
+struct strbuf_expand_dict_entry {
+        const char *placeholder;
+        const char *value;
+};
+extern size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder, void *context);
+
+__attribute__((format(printf,2,3)))
+extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
+
+extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
+/* XXX: if read fails, any partial read is undone */
+extern ssize_t strbuf_read(struct strbuf *, int fd, size_t hint);
+extern int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint);
+extern int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint);
+
+extern int strbuf_getline(struct strbuf *, FILE *, int);
+
+extern void stripspace(struct strbuf *buf, int skip_comments);
+extern int launch_editor(const char *path, struct strbuf *buffer, const char *const *env);
+
+extern int strbuf_branchname(struct strbuf *sb, const char *name);
+extern int strbuf_check_branch_ref(struct strbuf *sb, const char *name);
+
+#endif /* STRBUF_H */
diff --git a/Documentation/perf_counter/usage.c b/Documentation/perf_counter/usage.c
new file mode 100644
index 000000000000..7a10421fe6b4
--- /dev/null
+++ b/Documentation/perf_counter/usage.c
@@ -0,0 +1,80 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+#include "util.h"
+
+static void report(const char *prefix, const char *err, va_list params)
+{
+        char msg[1024];
+        vsnprintf(msg, sizeof(msg), err, params);
+        fprintf(stderr, "%s%s\n", prefix, msg);
+}
+
+static NORETURN void usage_builtin(const char *err)
+{
+        fprintf(stderr, "usage: %s\n", err);
+        exit(129);
+}
+
+static NORETURN void die_builtin(const char *err, va_list params)
+{
+        report("fatal: ", err, params);
+        exit(128);
+}
+
+static void error_builtin(const char *err, va_list params)
+{
+        report("error: ", err, params);
+}
+
+static void warn_builtin(const char *warn, va_list params)
+{
+        report("warning: ", warn, params);
+}
+
+/* If we are in a dlopen()ed .so write to a global variable would segfault
+ * (ugh), so keep things static. */
+static void (*usage_routine)(const char *err) NORETURN = usage_builtin;
+static void (*die_routine)(const char *err, va_list params) NORETURN = die_builtin;
+static void (*error_routine)(const char *err, va_list params) = error_builtin;
+static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
+
+void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN)
+{
+        die_routine = routine;
+}
+
+void usage(const char *err)
+{
+        usage_routine(err);
+}
+
+void die(const char *err, ...)
+{
+        va_list params;
+
+        va_start(params, err);
+        die_routine(err, params);
+        va_end(params);
+}
+
+int error(const char *err, ...)
+{
+        va_list params;
+
+        va_start(params, err);
+        error_routine(err, params);
+        va_end(params);
+        return -1;
+}
+
+void warning(const char *warn, ...)
+{
+        va_list params;
+
+        va_start(params, warn);
+        warn_routine(warn, params);
+        va_end(params);
+}
diff --git a/Documentation/perf_counter/util.h b/Documentation/perf_counter/util.h
new file mode 100644
index 000000000000..13f8bdce7600
--- /dev/null
+++ b/Documentation/perf_counter/util.h
@@ -0,0 +1,394 @@
+#ifndef GIT_COMPAT_UTIL_H
+#define GIT_COMPAT_UTIL_H
+
+#define _FILE_OFFSET_BITS 64
+
+#ifndef FLEX_ARRAY
+/*
+ * See if our compiler is known to support flexible array members.
+ */
+#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
+# define FLEX_ARRAY /* empty */
+#elif defined(__GNUC__)
+# if (__GNUC__ >= 3)
+#  define FLEX_ARRAY /* empty */
+# else
+#  define FLEX_ARRAY 0 /* older GNU extension */
+# endif
+#endif
+
+/*
+ * Otherwise, default to safer but a bit wasteful traditional style
+ */
+#ifndef FLEX_ARRAY
+# define FLEX_ARRAY 1
+#endif
+#endif
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
+
+#ifdef __GNUC__
+#define TYPEOF(x) (__typeof__(x))
+#else
+#define TYPEOF(x)
+#endif
+
+#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
+#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
+
+/* Approximation of the length of the decimal representation of this type. */
+#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
+
+#if !defined(__APPLE__) && !defined(__FreeBSD__)  && !defined(__USLC__) && !defined(_M_UNIX)
+#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
+#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
+#endif
+#define _ALL_SOURCE 1
+#define _GNU_SOURCE 1
+#define _BSD_SOURCE 1
+
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <sys/time.h>
+#include <time.h>
+#include <signal.h>
+#include <fnmatch.h>
+#include <assert.h>
+#include <regex.h>
+#include <utime.h>
+#ifndef __MINGW32__
+#include <sys/wait.h>
+#include <sys/poll.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#ifndef NO_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <inttypes.h>
+#if defined(__CYGWIN__)
+#undef _XOPEN_SOURCE
+#include <grp.h>
+#define _XOPEN_SOURCE 600
+#include "compat/cygwin.h"
+#else
+#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
+#include <grp.h>
+#define _ALL_SOURCE 1
+#endif
+#else   /* __MINGW32__ */
+/* pull in Windows compatibility stuff */
+#include "compat/mingw.h"
+#endif  /* __MINGW32__ */
+
+#ifndef NO_ICONV
+#include <iconv.h>
+#endif
+
+#ifndef NO_OPENSSL
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#endif
+
+/* On most systems <limits.h> would have given us this, but
+ * not on some systems (e.g. GNU/Hurd).
+ */
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
+#ifndef PRIuMAX
+#define PRIuMAX "llu"
+#endif
+
+#ifndef PRIu32
+#define PRIu32 "u"
+#endif
+
+#ifndef PRIx32
+#define PRIx32 "x"
+#endif
+
+#ifndef PATH_SEP
+#define PATH_SEP ':'
+#endif
+
+#ifndef STRIP_EXTENSION
+#define STRIP_EXTENSION ""
+#endif
+
+#ifndef has_dos_drive_prefix
+#define has_dos_drive_prefix(path) 0
+#endif
+
+#ifndef is_dir_sep
+#define is_dir_sep(c) ((c) == '/')
+#endif
+
+#ifdef __GNUC__
+#define NORETURN __attribute__((__noreturn__))
+#else
+#define NORETURN
+#ifndef __attribute__
+#define __attribute__(x)
+#endif
+#endif
+
+/* General helper functions */
+extern void usage(const char *err) NORETURN;
+extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
+extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
+extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
+
+extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
+
+extern int prefixcmp(const char *str, const char *prefix);
+extern time_t tm_to_time_t(const struct tm *tm);
+
+static inline const char *skip_prefix(const char *str, const char *prefix)
+{
+        size_t len = strlen(prefix);
+        return strncmp(str, prefix, len) ? NULL : str + len;
+}
+
+#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
+
+#ifndef PROT_READ
+#define PROT_READ 1
+#define PROT_WRITE 2
+#define MAP_PRIVATE 1
+#define MAP_FAILED ((void*)-1)
+#endif
+
+#define mmap git_mmap
+#define munmap git_munmap
+extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
+extern int git_munmap(void *start, size_t length);
+
+#else /* NO_MMAP || USE_WIN32_MMAP */
+
+#include <sys/mman.h>
+
+#endif /* NO_MMAP || USE_WIN32_MMAP */
+
+#ifdef NO_MMAP
+
+/* This value must be multiple of (pagesize * 2) */
+#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
+
+#else /* NO_MMAP */
+
+/* This value must be multiple of (pagesize * 2) */
+#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
+        (sizeof(void*) >= 8 \
+                ?  1 * 1024 * 1024 * 1024 \
+                : 32 * 1024 * 1024)
+
+#endif /* NO_MMAP */
+
+#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
+#define on_disk_bytes(st) ((st).st_size)
+#else
+#define on_disk_bytes(st) ((st).st_blocks * 512)
+#endif
+
+#define DEFAULT_PACKED_GIT_LIMIT \
+        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
+
+#ifdef NO_PREAD
+#define pread git_pread
+extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
+#endif
+/*
+ * Forward decl that will remind us if its twin in cache.h changes.
+ * This function is used in compat/pread.c.  But we can't include
+ * cache.h there.
+ */
+extern ssize_t read_in_full(int fd, void *buf, size_t count);
+
+#ifdef NO_SETENV
+#define setenv gitsetenv
+extern int gitsetenv(const char *, const char *, int);
+#endif
+
+#ifdef NO_MKDTEMP
+#define mkdtemp gitmkdtemp
+extern char *gitmkdtemp(char *);
+#endif
+
+#ifdef NO_UNSETENV
+#define unsetenv gitunsetenv
+extern void gitunsetenv(const char *);
+#endif
+
+#ifdef NO_STRCASESTR
+#define strcasestr gitstrcasestr
+extern char *gitstrcasestr(const char *haystack, const char *needle);
+#endif
+
+#ifdef NO_STRLCPY
+#define strlcpy gitstrlcpy
+extern size_t gitstrlcpy(char *, const char *, size_t);
+#endif
+
+#ifdef NO_STRTOUMAX
+#define strtoumax gitstrtoumax
+extern uintmax_t gitstrtoumax(const char *, char **, int);
+#endif
+
+#ifdef NO_HSTRERROR
+#define hstrerror githstrerror
+extern const char *githstrerror(int herror);
+#endif
+
+#ifdef NO_MEMMEM
+#define memmem gitmemmem
+void *gitmemmem(const void *haystack, size_t haystacklen,
+                const void *needle, size_t needlelen);
+#endif
+
+#ifdef FREAD_READS_DIRECTORIES
+#ifdef fopen
+#undef fopen
+#endif
+#define fopen(a,b) git_fopen(a,b)
+extern FILE *git_fopen(const char*, const char*);
+#endif
+
+#ifdef SNPRINTF_RETURNS_BOGUS
+#define snprintf git_snprintf
+extern int git_snprintf(char *str, size_t maxsize,
+                        const char *format, ...);
+#define vsnprintf git_vsnprintf
+extern int git_vsnprintf(char *str, size_t maxsize,
+                         const char *format, va_list ap);
+#endif
+
+#ifdef __GLIBC_PREREQ
+#if __GLIBC_PREREQ(2, 1)
+#define HAVE_STRCHRNUL
+#endif
+#endif
+
+#ifndef HAVE_STRCHRNUL
+#define strchrnul gitstrchrnul
+static inline char *gitstrchrnul(const char *s, int c)
+{
+        while (*s && *s != c)
+                s++;
+        return (char *)s;
+}
+#endif
+
+static inline size_t xsize_t(off_t len)
+{
+        return (size_t)len;
+}
+
+static inline int has_extension(const char *filename, const char *ext)
+{
+        size_t len = strlen(filename);
+        size_t extlen = strlen(ext);
+        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
+}
+
+/* Sane ctype - no locale, and works with signed chars */
+#undef isascii
+#undef isspace
+#undef isdigit
+#undef isalpha
+#undef isalnum
+#undef tolower
+#undef toupper
+extern unsigned char sane_ctype[256];
+#define GIT_SPACE 0x01
+#define GIT_DIGIT 0x02
+#define GIT_ALPHA 0x04
+#define GIT_GLOB_SPECIAL 0x08
+#define GIT_REGEX_SPECIAL 0x10
+#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
+#define isascii(x) (((x) & ~0x7f) == 0)
+#define isspace(x) sane_istest(x,GIT_SPACE)
+#define isdigit(x) sane_istest(x,GIT_DIGIT)
+#define isalpha(x) sane_istest(x,GIT_ALPHA)
+#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
+#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
+#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
+#define tolower(x) sane_case((unsigned char)(x), 0x20)
+#define toupper(x) sane_case((unsigned char)(x), 0)
+
+static inline int sane_case(int x, int high)
+{
+        if (sane_istest(x, GIT_ALPHA))
+                x = (x & ~0x20) | high;
+        return x;
+}
+
+static inline int strtoul_ui(char const *s, int base, unsigned int *result)
+{
+        unsigned long ul;
+        char *p;
+
+        errno = 0;
+        ul = strtoul(s, &p, base);
+        if (errno || *p || p == s || (unsigned int) ul != ul)
+                return -1;
+        *result = ul;
+        return 0;
+}
+
+static inline int strtol_i(char const *s, int base, int *result)
+{
+        long ul;
+        char *p;
+
+        errno = 0;
+        ul = strtol(s, &p, base);
+        if (errno || *p || p == s || (int) ul != ul)
+                return -1;
+        *result = ul;
+        return 0;
+}
+
+#ifdef INTERNAL_QSORT
+void git_qsort(void *base, size_t nmemb, size_t size,
+               int(*compar)(const void *, const void *));
+#define qsort git_qsort
+#endif
+
+#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
+# define FORCE_DIR_SET_GID S_ISGID
+#else
+# define FORCE_DIR_SET_GID 0
+#endif
+
+#ifdef NO_NSEC
+#undef USE_NSEC
+#define ST_CTIME_NSEC(st) 0
+#define ST_MTIME_NSEC(st) 0
+#else
+#ifdef USE_ST_TIMESPEC
+#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
+#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
+#else
+#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
+#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
+#endif
+#endif
+
+#endif
diff --git a/Documentation/perf_counter/wrapper.c b/Documentation/perf_counter/wrapper.c
new file mode 100644
index 000000000000..6350d65f6d9e
--- /dev/null
+++ b/Documentation/perf_counter/wrapper.c
@@ -0,0 +1,206 @@
+/*
+ * Various trivial helper wrappers around standard functions
+ */
+#include "cache.h"
+
+/*
+ * There's no pack memory to release - but stay close to the Git
+ * version so wrap this away:
+ */
+static inline void release_pack_memory(size_t size, int flag)
+{
+}
+
+char *xstrdup(const char *str)
+{
+        char *ret = strdup(str);
+        if (!ret) {
+                release_pack_memory(strlen(str) + 1, -1);
+                ret = strdup(str);
+                if (!ret)
+                        die("Out of memory, strdup failed");
+        }
+        return ret;
+}
+
+void *xmalloc(size_t size)
+{
+        void *ret = malloc(size);
+        if (!ret && !size)
+                ret = malloc(1);
+        if (!ret) {
+                release_pack_memory(size, -1);
+                ret = malloc(size);
+                if (!ret && !size)
+                        ret = malloc(1);
+                if (!ret)
+                        die("Out of memory, malloc failed");
+        }
+#ifdef XMALLOC_POISON
+        memset(ret, 0xA5, size);
+#endif
+        return ret;
+}
+
+/*
+ * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
+ * "data" to the allocated memory, zero terminates the allocated memory,
+ * and returns a pointer to the allocated memory. If the allocation fails,
+ * the program dies.
+ */
+void *xmemdupz(const void *data, size_t len)
+{
+        char *p = xmalloc(len + 1);
+        memcpy(p, data, len);
+        p[len] = '\0';
+        return p;
+}
+
+char *xstrndup(const char *str, size_t len)
+{
+        char *p = memchr(str, '\0', len);
+        return xmemdupz(str, p ? p - str : len);
+}
+
+void *xrealloc(void *ptr, size_t size)
+{
+        void *ret = realloc(ptr, size);
+        if (!ret && !size)
+                ret = realloc(ptr, 1);
+        if (!ret) {
+                release_pack_memory(size, -1);
+                ret = realloc(ptr, size);
+                if (!ret && !size)
+                        ret = realloc(ptr, 1);
+                if (!ret)
+                        die("Out of memory, realloc failed");
+        }
+        return ret;
+}
+
+void *xcalloc(size_t nmemb, size_t size)
+{
+        void *ret = calloc(nmemb, size);
+        if (!ret && (!nmemb || !size))
+                ret = calloc(1, 1);
+        if (!ret) {
+                release_pack_memory(nmemb * size, -1);
+                ret = calloc(nmemb, size);
+                if (!ret && (!nmemb || !size))
+                        ret = calloc(1, 1);
+                if (!ret)
+                        die("Out of memory, calloc failed");
+        }
+        return ret;
+}
+
+void *xmmap(void *start, size_t length,
+        int prot, int flags, int fd, off_t offset)
+{
+        void *ret = mmap(start, length, prot, flags, fd, offset);
+        if (ret == MAP_FAILED) {
+                if (!length)
+                        return NULL;
+                release_pack_memory(length, fd);
+                ret = mmap(start, length, prot, flags, fd, offset);
+                if (ret == MAP_FAILED)
+                        die("Out of memory? mmap failed: %s", strerror(errno));
+        }
+        return ret;
+}
+
+/*
+ * xread() is the same a read(), but it automatically restarts read()
+ * operations with a recoverable error (EAGAIN and EINTR). xread()
+ * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
+ */
+ssize_t xread(int fd, void *buf, size_t len)
+{
+        ssize_t nr;
+        while (1) {
+                nr = read(fd, buf, len);
+                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
+                        continue;
+                return nr;
+        }
+}
+
+/*
+ * xwrite() is the same a write(), but it automatically restarts write()
+ * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
+ * GUARANTEE that "len" bytes is written even if the operation is successful.
+ */
+ssize_t xwrite(int fd, const void *buf, size_t len)
+{
+        ssize_t nr;
+        while (1) {
+                nr = write(fd, buf, len);
+                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
+                        continue;
+                return nr;
+        }
+}
+
+ssize_t read_in_full(int fd, void *buf, size_t count)
+{
+        char *p = buf;
+        ssize_t total = 0;
+
+        while (count > 0) {
+                ssize_t loaded = xread(fd, p, count);
+                if (loaded <= 0)
+                        return total ? total : loaded;
+                count -= loaded;
+                p += loaded;
+                total += loaded;
+        }
+
+        return total;
+}
+
+ssize_t write_in_full(int fd, const void *buf, size_t count)
+{
+        const char *p = buf;
+        ssize_t total = 0;
+
+        while (count > 0) {
+                ssize_t written = xwrite(fd, p, count);
+                if (written < 0)
+                        return -1;
+                if (!written) {
+                        errno = ENOSPC;
+                        return -1;
+                }
+                count -= written;
+                p += written;
+                total += written;
+        }
+
+        return total;
+}
+
+int xdup(int fd)
+{
+        int ret = dup(fd);
+        if (ret < 0)
+                die("dup failed: %s", strerror(errno));
+        return ret;
+}
+
+FILE *xfdopen(int fd, const char *mode)
+{
+        FILE *stream = fdopen(fd, mode);
+        if (stream == NULL)
+                die("Out of memory? fdopen failed: %s", strerror(errno));
+        return stream;
+}
+
+int xmkstemp(char *template)
+{
+        int fd;
+
+        fd = mkstemp(template);
+        if (fd < 0)
+                die("Unable to create temporary file: %s", strerror(errno));
+        return fd;
+}