tracing: Remove kmemtrace ftrace plugin

We have been resisting new ftrace plugins and removing existing
ones, and kmemtrace has been superseded by kmem trace events
and perf-kmem, so we remove it.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
[ remove kmemtrace from the makefile, handle slob too ]
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

2 files changed, 0 insertions, 197 deletions

diff --git a/Documentation/ABI/testing/debugfs-kmemtrace b/Documentation/ABI/testing/debugfs-kmemtrace
deleted file mode 100644
index 5e6a92a02d85..000000000000
--- a/Documentation/ABI/testing/debugfs-kmemtrace
+++ /dev/null
@@ -1,71 +0,0 @@
-What:           /sys/kernel/debug/kmemtrace/
-Date:           July 2008
-Contact:        Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
-Description:
-
-In kmemtrace-enabled kernels, the following files are created:
-
-/sys/kernel/debug/kmemtrace/
-        cpu<n>          (0400)  Per-CPU tracing data, see below. (binary)
-        total_overruns  (0400)  Total number of bytes which were dropped from
-                                cpu<n> files because of full buffer condition,
-                                non-binary. (text)
-        abi_version     (0400)  Kernel's kmemtrace ABI version. (text)
-
-Each per-CPU file should be read according to the relay interface. That is,
-the reader should set affinity to that specific CPU and, as currently done by
-the userspace application (though there are other methods), use poll() with
-an infinite timeout before every read(). Otherwise, erroneous data may be
-read. The binary data has the following _core_ format:
-
-        Event ID        (1 byte)        Unsigned integer, one of:
-                0 - represents an allocation (KMEMTRACE_EVENT_ALLOC)
-                1 - represents a freeing of previously allocated memory
-                    (KMEMTRACE_EVENT_FREE)
-        Type ID         (1 byte)        Unsigned integer, one of:
-                0 - this is a kmalloc() / kfree()
-                1 - this is a kmem_cache_alloc() / kmem_cache_free()
-                2 - this is a __get_free_pages() et al.
-        Event size      (2 bytes)       Unsigned integer representing the
-                                        size of this event. Used to extend
-                                        kmemtrace. Discard the bytes you
-                                        don't know about.
-        Sequence number (4 bytes)       Signed integer used to reorder data
-                                        logged on SMP machines. Wraparound
-                                        must be taken into account, although
-                                        it is unlikely.
-        Caller address  (8 bytes)       Return address to the caller.
-        Pointer to mem  (8 bytes)       Pointer to target memory area. Can be
-                                        NULL, but not all such calls might be
-                                        recorded.
-
-In case of KMEMTRACE_EVENT_ALLOC events, the next fields follow:
-
-        Requested bytes (8 bytes)       Total number of requested bytes,
-                                        unsigned, must not be zero.
-        Allocated bytes (8 bytes)       Total number of actually allocated
-                                        bytes, unsigned, must not be lower
-                                        than requested bytes.
-        Requested flags (4 bytes)       GFP flags supplied by the caller.
-        Target CPU      (4 bytes)       Signed integer, valid for event id 1.
-                                        If equal to -1, target CPU is the same
-                                        as origin CPU, but the reverse might
-                                        not be true.
-
-The data is made available in the same endianness the machine has.
-
-Other event ids and type ids may be defined and added. Other fields may be
-added by increasing event size, but see below for details.
-Every modification to the ABI, including new id definitions, are followed
-by bumping the ABI version by one.
-
-Adding new data to the packet (features) is done at the end of the mandatory
-data:
-        Feature size    (2 byte)
-        Feature ID      (1 byte)
-        Feature data    (Feature size - 3 bytes)
-
-
-Users:
-        kmemtrace-user - git://repo.or.cz/kmemtrace-user.git
-
diff --git a/Documentation/trace/kmemtrace.txt b/Documentation/trace/kmemtrace.txt
deleted file mode 100644
index 6308735e58ca..000000000000
--- a/Documentation/trace/kmemtrace.txt
+++ /dev/null
@@ -1,126 +0,0 @@
-                        kmemtrace - Kernel Memory Tracer
-
-                          by Eduard - Gabriel Munteanu
-                             <eduard.munteanu@linux360.ro>
-
-I. Introduction
-===============
-
-kmemtrace helps kernel developers figure out two things:
-1) how different allocators (SLAB, SLUB etc.) perform
-2) how kernel code allocates memory and how much
-
-To do this, we trace every allocation and export information to the userspace
-through the relay interface. We export things such as the number of requested
-bytes, the number of bytes actually allocated (i.e. including internal
-fragmentation), whether this is a slab allocation or a plain kmalloc() and so
-on.
-
-The actual analysis is performed by a userspace tool (see section III for
-details on where to get it from). It logs the data exported by the kernel,
-processes it and (as of writing this) can provide the following information:
-- the total amount of memory allocated and fragmentation per call-site
-- the amount of memory allocated and fragmentation per allocation
-- total memory allocated and fragmentation in the collected dataset
-- number of cross-CPU allocation and frees (makes sense in NUMA environments)
-
-Moreover, it can potentially find inconsistent and erroneous behavior in
-kernel code, such as using slab free functions on kmalloc'ed memory or
-allocating less memory than requested (but not truly failed allocations).
-
-kmemtrace also makes provisions for tracing on some arch and analysing the
-data on another.
-
-II. Design and goals
-====================
-
-kmemtrace was designed to handle rather large amounts of data. Thus, it uses
-the relay interface to export whatever is logged to userspace, which then
-stores it. Analysis and reporting is done asynchronously, that is, after the
-data is collected and stored. By design, it allows one to log and analyse
-on different machines and different arches.
-
-As of writing this, the ABI is not considered stable, though it might not
-change much. However, no guarantees are made about compatibility yet. When
-deemed stable, the ABI should still allow easy extension while maintaining
-backward compatibility. This is described further in Documentation/ABI.
-
-Summary of design goals:
-        - allow logging and analysis to be done across different machines
-        - be fast and anticipate usage in high-load environments (*)
-        - be reasonably extensible
-        - make it possible for GNU/Linux distributions to have kmemtrace
-        included in their repositories
-
-(*) - one of the reasons Pekka Enberg's original userspace data analysis
-    tool's code was rewritten from Perl to C (although this is more than a
-    simple conversion)
-
-
-III. Quick usage guide
-======================
-
-1) Get a kernel that supports kmemtrace and build it accordingly (i.e. enable
-CONFIG_KMEMTRACE).
-
-2) Get the userspace tool and build it:
-$ git clone git://repo.or.cz/kmemtrace-user.git         # current repository
-$ cd kmemtrace-user/
-$ ./autogen.sh
-$ ./configure
-$ make
-
-3) Boot the kmemtrace-enabled kernel if you haven't, preferably in the
-'single' runlevel (so that relay buffers don't fill up easily), and run
-kmemtrace:
-# '$' does not mean user, but root here.
-$ mount -t debugfs none /sys/kernel/debug
-$ mount -t proc none /proc
-$ cd path/to/kmemtrace-user/
-$ ./kmemtraced
-Wait a bit, then stop it with CTRL+C.
-$ cat /sys/kernel/debug/kmemtrace/total_overruns        # Check if we didn't
-                                                        # overrun, should
-                                                        # be zero.
-$ (Optionally) [Run kmemtrace_check separately on each cpu[0-9]*.out file to
-                check its correctness]
-$ ./kmemtrace-report
-
-Now you should have a nice and short summary of how the allocator performs.
-
-IV. FAQ and known issues
-========================
-
-Q: 'cat /sys/kernel/debug/kmemtrace/total_overruns' is non-zero, how do I fix
-this? Should I worry?
-A: If it's non-zero, this affects kmemtrace's accuracy, depending on how
-large the number is. You can fix it by supplying a higher
-'kmemtrace.subbufs=N' kernel parameter.
----
-
-Q: kmemtrace_check reports errors, how do I fix this? Should I worry?
-A: This is a bug and should be reported. It can occur for a variety of
-reasons:
-        - possible bugs in relay code
-        - possible misuse of relay by kmemtrace
-        - timestamps being collected unorderly
-Or you may fix it yourself and send us a patch.
----
-
-Q: kmemtrace_report shows many errors, how do I fix this? Should I worry?
-A: This is a known issue and I'm working on it. These might be true errors
-in kernel code, which may have inconsistent behavior (e.g. allocating memory
-with kmem_cache_alloc() and freeing it with kfree()). Pekka Enberg pointed
-out this behavior may work with SLAB, but may fail with other allocators.
-
-It may also be due to lack of tracing in some unusual allocator functions.
-
-We don't want bug reports regarding this issue yet.
----
-
-V. See also
-===========
-
-Documentation/kernel-parameters.txt
-Documentation/ABI/testing/debugfs-kmemtrace
-