litmus-rt.git/tools/vm, branch master

tools/vm: fix page-flags build

2015-05-15T00:55:51+00:00

libabikfs.a doesn't exist anymore, so we now need to link with libapi.a.

Signed-off-by: Andi Kleen 
Cc: Naoya Horiguchi 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm:add KPF_ZERO_PAGE flag for /proc/kpageflags

2015-02-12T01:06:00+00:00

Add KPF_ZERO_PAGE flag for zero_page, so that userspace processes can
detect zero_page in /proc/kpageflags, and then do memory analysis more
accurately.

Signed-off-by: Yalin Wang 
Acked-by: Kirill A. Shutemov 
Cc: Konstantin Khlebnikov 
Cc: Naoya Horiguchi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/page_owner: keep track of page owners

2014-12-13T20:42:48+00:00

This is the page owner tracking code which is introduced so far ago.  It
is resident on Andrew's tree, though, nobody tried to upstream so it
remain as is.  Our company uses this feature actively to debug memory leak
or to find a memory hogger so I decide to upstream this feature.

This functionality help us to know who allocates the page.  When
allocating a page, we store some information about allocation in extra
memory.  Later, if we need to know status of all pages, we can get and
analyze it from this stored information.

In previous version of this feature, extra memory is statically defined in
struct page, but, in this version, extra memory is allocated outside of
struct page.  It enables us to turn on/off this feature at boottime
without considerable memory waste.

Although we already have tracepoint for tracing page allocation/free,
using it to analyze page owner is rather complex.  We need to enlarge the
trace buffer for preventing overlapping until userspace program launched.
And, launched program continually dump out the trace buffer for later
analysis and it would change system behaviour with more possibility rather
than just keeping it in memory, so bad for debug.

Moreover, we can use page_owner feature further for various purposes.  For
example, we can use it for fragmentation statistics implemented in this
patch.  And, I also plan to implement some CMA failure debugging feature
using this interface.

I'd like to give the credit for all developers contributed this feature,
but, it's not easy because I don't know exact history.  Sorry about that.
Below is people who has "Signed-off-by" in the patches in Andrew's tree.

Contributor:
Alexander Nyberg 
Mel Gorman 
Dave Hansen 
Minchan Kim 
Michal Nazarewicz 
Andrew Morton 
Jungsoo Son 

Signed-off-by: Joonsoo Kim 
Cc: Mel Gorman 
Cc: Johannes Weiner 
Cc: Minchan Kim 
Cc: Dave Hansen 
Cc: Michal Nazarewicz 
Cc: Jungsoo Son 
Cc: Ingo Molnar 
Cc: Joonsoo Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/balloon_compaction: add vmstat counters and kpageflags bit

2014-10-10T02:26:01+00:00

Always mark pages with PageBalloon even if balloon compaction is disabled
and expose this mark in /proc/kpageflags as KPF_BALLOON.

Also this patch adds three counters into /proc/vmstat: "balloon_inflate",
"balloon_deflate" and "balloon_migrate".  They accumulate balloon
activity.  Current size of balloon is (balloon_inflate - balloon_deflate)
pages.

All generic balloon code now gathered under option CONFIG_MEMORY_BALLOON.
It should be selected by ballooning driver which wants use this feature.
Currently virtio-balloon is the only user.

Signed-off-by: Konstantin Khlebnikov 
Cc: Rafael Aquini 
Cc: Andrey Ryabinin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

tools/vm/page-types.c: catch sigbus if raced with truncate

2014-06-04T23:53:51+00:00

Recently added page-cache dumping is known to be a little bit racy.
But after race with truncate it just dies due to unhandled SIGBUS
when it tries to poke pages beyond the new end of file.
This patch adds handler for SIGBUS which skips the rest of the file.

Signed-off-by: Konstantin Khlebnikov 
Cc: Naoya Horiguchi 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

tools/vm/page-types.c: page-cache sniffing feature

2014-04-07T23:35:52+00:00

After this patch 'page-types' can walk over a file's mappings and
analyze populated page cache pages mostly without disturbing its state.

It maps chunk of file, marks VMA as MADV_RANDOM to turn off readahead,
pokes VMA via mincore() to determine cached pages, triggers page-fault
only for them, and finally gathers information via pagemap/kpageflags.
Before unmap it marks VMA as MADV_SEQUENTIAL for ignoring reference
bits.

usage: page-types -f 

If  is directory it will analyse all files in all subdirectories.

Symlinks are not followed as well as mount points.  Hardlinks aren't
handled, they'll be dumped as many times as they are found.  Recursive
walk brings all dentries into dcache and populates page cache of
block-devices aka 'Buffers'.

Probably it's worth to add ioctl for dumping file page cache as array of
PFNs as a replacement for this hackish juggling with
mmap/madvise/mincore/pagemap.  Also recursive walk could be replaced
with dumping cached inodes via some ioctl or debugfs interface followed
by openning them via open_by_handle_at, this would fix hardlinks
handling and unneeded population of dcache and buffers.  This interface
might be used as data source for constructing readahead plans and for
background optimizations of actively used files.

collateral changes:
+ fix 64-bit LFS: define _FILE_OFFSET_BITS instead of _LARGEFILE64_SOURCE
+ replace lseek + read with single pread
+ make show_page_range() reusable after flush

usage example:

  ~/src/linux/tools/vm$ sudo ./page-types -L -f page-types
  foffset offset    flags
  page-types       Inode: 2229277       Size: 89065 (22 pages)
  Modify: Tue Feb 25 12:00:59 2014 (162 seconds ago)
  Access: Tue Feb 25 12:01:00 2014 (161 seconds ago)
  0       3cbf3b     __RU_lA____M________________________
  1       38946a     __RU_lA____M________________________
  2       1a3cec     __RU_lA____M________________________
  3       1a8321     __RU_lA____M________________________
  4       3af7cc     __RU_lA____M________________________
  5       1ed532     __RU_lA_____________________________
  6       2e436a     __RU_lA_____________________________
  7       29a35e     ___U_lA_____________________________
  8       2de86e     ___U_lA_____________________________
  9       3bdfb4     ___U_lA_____________________________
  10      3cd8a3     ___U_lA_____________________________
  11      2afa50     ___U_lA_____________________________
  12      2534c2     ___U_lA_____________________________
  13      1b7a40     ___U_lA_____________________________
  14      17b0be     ___U_lA_____________________________
  15      392b0c     ___U_lA_____________________________
  16      3ba46a     __RU_lA_____________________________
  17      397dc8     ___U_lA_____________________________
  18      1f2a36     ___U_lA_____________________________
  19      21fd30     __RU_lA_____________________________
  20      2c35ba     __RU_l______________________________
  21      20f181     __RU_l______________________________

               flags page-count   MB  symbolic-flags                        long-symbolic-flags
  0x000000000000002c          2    0  __RU_l______________________________  referenced,uptodate,lru
  0x0000000000000068         11    0  ___U_lA_____________________________  uptodate,lru,active
  0x000000000000006c          4    0  __RU_lA_____________________________  referenced,uptodate,lru,active
  0x000000000000086c          5    0  __RU_lA____M________________________  referenced,uptodate,lru,active,mmap
               total         22    0

  ~/src/linux/tools/vm$ sudo ./page-types -f /
               flags page-count     MB  symbolic-flags                        long-symbolic-flags
  0x0000000000000028      21761     85  ___U_l______________________________  uptodate,lru
  0x000000000000002c     127279    497  __RU_l______________________________  referenced,uptodate,lru
  0x0000000000000068      74160    289  ___U_lA_____________________________  uptodate,lru,active
  0x000000000000006c      84469    329  __RU_lA_____________________________  referenced,uptodate,lru,active
  0x000000000000007c          1      0  __RUDlA_____________________________  referenced,uptodate,dirty,lru,active
  0x0000000000000228        370      1  ___U_l___I__________________________  uptodate,lru,reclaim
  0x0000000000000828         49      0  ___U_l_____M________________________  uptodate,lru,mmap
  0x000000000000082c        126      0  __RU_l_____M________________________  referenced,uptodate,lru,mmap
  0x0000000000000868        137      0  ___U_lA____M________________________  uptodate,lru,active,mmap
  0x000000000000086c      12890     50  __RU_lA____M________________________  referenced,uptodate,lru,active,mmap
               total     321242   1254

Signed-off-by: Konstantin Khlebnikov 
Cc: Arnaldo Carvalho de Melo 
Cc: Fengguang Wu 
Cc: Borislav Petkov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

tools/: Convert to new topic libraries

2013-12-16T19:03:27+00:00

Move debugfs.* to api/fs/. We have a common tools/lib/api/ place where
the Makefile lives and then we place the headers in subdirs.

For example, all the fs-related stuff goes to tools/lib/api/fs/ from
which we get libapikfs.a (acme got almost the naming he wanted :-)) and
we link it into the tools which need it - in this case perf and
tools/vm/page-types.

acme:

"Looking at the implementation, I think some tools can even link
directly to the .o files, avoiding the .a file altogether.

But that is just an optimization/finer granularity tools/lib/
cherrypicking that toolers can make use of."

Fixup documentation cleaning target while at it.

Signed-off-by: Borislav Petkov 
Acked-by: Ingo Molnar 
Cc: Adrian Hunter 
Cc: Andi Kleen 
Cc: Arjan van de Ven 
Cc: David Ahern 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Mike Galbraith 
Cc: Namhyung Kim 
Cc: Paul Mackerras 
Cc: Pekka Enberg 
Cc: Peter Zijlstra 
Cc: Robert Richter 
Cc: Stanislav Fomichev 
Cc: Stephane Eranian 
Cc: Steven Rostedt 
Link: http://lkml.kernel.org/r/1386605664-24041-2-git-send-email-bp@alien8.de
Signed-off-by: Arnaldo Carvalho de Melo

tools/vm/page-types.c: support KPF_SOFTDIRTY bit

2013-11-13T03:09:07+00:00

Soft dirty bit allows us to track which pages are written since the last
clear_ref (by "echo 4 > /proc/pid/clear_refs".) This is useful for
userspace applications to know their memory footprints.

Note that the kernel exposes this flag via bit[55] of /proc/pid/pagemap,
and the semantics is not a default one (scheduled to be the default in the
near future.) However, it shifts to the new semantics at the first
clear_ref, and the users of soft dirty bit always do it before utilizing
the bit, so that's not a big deal.  Users must avoid relying on the bit in
page-types before the first clear_ref.

Signed-off-by: Naoya Horiguchi 
Cc: Wu Fengguang 
Cc: Pavel Emelyanov 
Cc: Cyrill Gorcunov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

tools/vm: Switch to liblk library

2013-03-15T16:06:01+00:00

page-flags.c had some older version of debugfs_mount copied from perf so
convert it to using the version in the tools library.

Signed-off-by: Borislav Petkov 
Cc: Ingo Molnar 
Cc: Steven Rostedt 
Cc: Wu Fengguang 
Link: http://lkml.kernel.org/r/1361374353-30385-8-git-send-email-bp@alien8.de
Signed-off-by: Arnaldo Carvalho de Melo

tools/vm: add .gitignore to ignore built binaries

2013-02-05T09:38:46+00:00

There is no .gitignore in tools/vm, so 'git status' always show built
binaries.  To ignore this, add .gitignore.

Signed-off-by: Joonsoo Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds