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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ones, and kmemtrace has been superseded by kmem trace events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>
This commit is contained in:
Li Zefan 2010-05-26 17:22:17 +08:00 committed by Frederic Weisbecker
parent 30dbb20e68
commit 039ca4e74a
15 changed files with 7 additions and 833 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
Documentation/ABI/testing/debugfs-kmemtrace
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@ -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

126
Documentation/trace/kmemtrace.txt
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@ -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

7
MAINTAINERS
View File

@ -3361,13 +3361,6 @@ F: include/linux/kmemleak.h
F: mm/kmemleak.c F: mm/kmemleak.c
F: mm/kmemleak-test.c F: mm/kmemleak-test.c
KMEMTRACE
M: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
S: Maintained
F: Documentation/trace/kmemtrace.txt
F: include/linux/kmemtrace.h
F: kernel/trace/kmemtrace.c
KPROBES KPROBES
M: Ananth N Mavinakayanahalli <ananth@in.ibm.com> M: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
M: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> M: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>

25
include/linux/kmemtrace.h
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@ -1,25 +0,0 @@
/*
* Copyright (C) 2008 Eduard - Gabriel Munteanu
*
* This file is released under GPL version 2.
*/
#ifndef _LINUX_KMEMTRACE_H
#define _LINUX_KMEMTRACE_H
#ifdef __KERNEL__
#include <trace/events/kmem.h>
#ifdef CONFIG_KMEMTRACE
extern void kmemtrace_init(void);
#else
static inline void kmemtrace_init(void)
{
}
#endif
#endif /* __KERNEL__ */
#endif /* _LINUX_KMEMTRACE_H */

3
include/linux/slab_def.h
View File

@ -14,7 +14,8 @@
#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */ #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */ #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
#include <linux/compiler.h> #include <linux/compiler.h>
#include <linux/kmemtrace.h>
#include <trace/events/kmem.h>
#ifndef ARCH_KMALLOC_MINALIGN #ifndef ARCH_KMALLOC_MINALIGN
/* /*

3
include/linux/slub_def.h
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@ -10,9 +10,10 @@
#include <linux/gfp.h> #include <linux/gfp.h>
#include <linux/workqueue.h> #include <linux/workqueue.h>
#include <linux/kobject.h> #include <linux/kobject.h>
#include <linux/kmemtrace.h>
#include <linux/kmemleak.h> #include <linux/kmemleak.h>
#include <trace/events/kmem.h>
enum stat_item { enum stat_item {
ALLOC_FASTPATH, /* Allocation from cpu slab */ ALLOC_FASTPATH, /* Allocation from cpu slab */
ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */ ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */

2
init/main.c
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@ -66,7 +66,6 @@
#include <linux/ftrace.h> #include <linux/ftrace.h>
#include <linux/async.h> #include <linux/async.h>
#include <linux/kmemcheck.h> #include <linux/kmemcheck.h>
#include <linux/kmemtrace.h>
#include <linux/sfi.h> #include <linux/sfi.h>
#include <linux/shmem_fs.h> #include <linux/shmem_fs.h>
#include <linux/slab.h> #include <linux/slab.h>
@ -652,7 +651,6 @@ asmlinkage void __init start_kernel(void)
#endif #endif
page_cgroup_init(); page_cgroup_init();
enable_debug_pagealloc(); enable_debug_pagealloc();
kmemtrace_init();
kmemleak_init(); kmemleak_init();
debug_objects_mem_init(); debug_objects_mem_init();
idr_init_cache(); idr_init_cache();

20
kernel/trace/Kconfig
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@ -354,26 +354,6 @@ config STACK_TRACER
Say N if unsure. Say N if unsure.
config KMEMTRACE
bool "Trace SLAB allocations"
select GENERIC_TRACER
help
kmemtrace provides tracing for slab allocator functions, such as
kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
data is then fed to the userspace application in order to analyse
allocation hotspots, internal fragmentation and so on, making it
possible to see how well an allocator performs, as well as debug
and profile kernel code.
This requires an userspace application to use. See
Documentation/trace/kmemtrace.txt for more information.
Saying Y will make the kernel somewhat larger and slower. However,
if you disable kmemtrace at run-time or boot-time, the performance
impact is minimal (depending on the arch the kernel is built for).
If unsure, say N.
config WORKQUEUE_TRACER config WORKQUEUE_TRACER
bool "Trace workqueues" bool "Trace workqueues"
select GENERIC_TRACER select GENERIC_TRACER

1
kernel/trace/Makefile
View File

@ -40,7 +40,6 @@ obj-$(CONFIG_STACK_TRACER) += trace_stack.o
obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
ifeq ($(CONFIG_BLOCK),y) ifeq ($(CONFIG_BLOCK),y)

529
kernel/trace/kmemtrace.c
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@ -1,529 +0,0 @@
/*
* Memory allocator tracing
*
* Copyright (C) 2008 Eduard - Gabriel Munteanu
* Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
* Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
*/
#include <linux/tracepoint.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/dcache.h>
#include <linux/fs.h>
#include <linux/kmemtrace.h>
#include "trace_output.h"
#include "trace.h"
/* Select an alternative, minimalistic output than the original one */
#define TRACE_KMEM_OPT_MINIMAL 0x1
static struct tracer_opt kmem_opts[] = {
/* Default disable the minimalistic output */
{ TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
{ }
};
static struct tracer_flags kmem_tracer_flags = {
.val = 0,
.opts = kmem_opts
};
static struct trace_array *kmemtrace_array;
/* Trace allocations */
static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
unsigned long call_site,
const void *ptr,
size_t bytes_req,
size_t bytes_alloc,
gfp_t gfp_flags,
int node)
{
struct ftrace_event_call *call = &event_kmem_alloc;
struct trace_array *tr = kmemtrace_array;
struct kmemtrace_alloc_entry *entry;
struct ring_buffer_event *event;
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
if (!event)
return;
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, 0);
entry->ent.type = TRACE_KMEM_ALLOC;
entry->type_id = type_id;
entry->call_site = call_site;
entry->ptr = ptr;
entry->bytes_req = bytes_req;
entry->bytes_alloc = bytes_alloc;
entry->gfp_flags = gfp_flags;
entry->node = node;
if (!filter_check_discard(call, entry, tr->buffer, event))
ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
unsigned long call_site,
const void *ptr)
{
struct ftrace_event_call *call = &event_kmem_free;
struct trace_array *tr = kmemtrace_array;
struct kmemtrace_free_entry *entry;
struct ring_buffer_event *event;
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
if (!event)
return;
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, 0);
entry->ent.type = TRACE_KMEM_FREE;
entry->type_id = type_id;
entry->call_site = call_site;
entry->ptr = ptr;
if (!filter_check_discard(call, entry, tr->buffer, event))
ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
static void kmemtrace_kmalloc(void *ignore,
unsigned long call_site,
const void *ptr,
size_t bytes_req,
size_t bytes_alloc,
gfp_t gfp_flags)
{
kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
bytes_req, bytes_alloc, gfp_flags, -1);
}
static void kmemtrace_kmem_cache_alloc(void *ignore,
unsigned long call_site,
const void *ptr,
size_t bytes_req,
size_t bytes_alloc,
gfp_t gfp_flags)
{
kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
bytes_req, bytes_alloc, gfp_flags, -1);
}
static void kmemtrace_kmalloc_node(void *ignore,
unsigned long call_site,
const void *ptr,
size_t bytes_req,
size_t bytes_alloc,
gfp_t gfp_flags,
int node)
{
kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
bytes_req, bytes_alloc, gfp_flags, node);
}
static void kmemtrace_kmem_cache_alloc_node(void *ignore,
unsigned long call_site,
const void *ptr,
size_t bytes_req,
size_t bytes_alloc,
gfp_t gfp_flags,
int node)
{
kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
bytes_req, bytes_alloc, gfp_flags, node);
}
static void
kmemtrace_kfree(void *ignore, unsigned long call_site, const void *ptr)
{
kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
}
static void kmemtrace_kmem_cache_free(void *ignore,
unsigned long call_site, const void *ptr)
{
kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr);
}
static int kmemtrace_start_probes(void)
{
int err;
err = register_trace_kmalloc(kmemtrace_kmalloc, NULL);
if (err)
return err;
err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
if (err)
return err;
err = register_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
if (err)
return err;
err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
if (err)
return err;
err = register_trace_kfree(kmemtrace_kfree, NULL);
if (err)
return err;
err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
return err;
}
static void kmemtrace_stop_probes(void)
{
unregister_trace_kmalloc(kmemtrace_kmalloc, NULL);
unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
unregister_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
unregister_trace_kfree(kmemtrace_kfree, NULL);
unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
}
static int kmem_trace_init(struct trace_array *tr)
{
kmemtrace_array = tr;
tracing_reset_online_cpus(tr);
kmemtrace_start_probes();
return 0;
}
static void kmem_trace_reset(struct trace_array *tr)
{
kmemtrace_stop_probes();
}
static void kmemtrace_headers(struct seq_file *s)
{
/* Don't need headers for the original kmemtrace output */
if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
return;
seq_printf(s, "#\n");
seq_printf(s, "# ALLOC TYPE REQ GIVEN FLAGS "
" POINTER NODE CALLER\n");
seq_printf(s, "# FREE | | | | "
" | | | |\n");
seq_printf(s, "# |\n\n");
}
/*
* The following functions give the original output from kmemtrace,
* plus the origin CPU, since reordering occurs in-kernel now.
*/
#define KMEMTRACE_USER_ALLOC 0
#define KMEMTRACE_USER_FREE 1
struct kmemtrace_user_event {
u8 event_id;
u8 type_id;
u16 event_size;
u32 cpu;
u64 timestamp;
unsigned long call_site;
unsigned long ptr;
};
struct kmemtrace_user_event_alloc {
size_t bytes_req;
size_t bytes_alloc;
unsigned gfp_flags;
int node;
};
static enum print_line_t
kmemtrace_print_alloc(struct trace_iterator *iter, int flags,
struct trace_event *event)
{
struct trace_seq *s = &iter->seq;
struct kmemtrace_alloc_entry *entry;
int ret;
trace_assign_type(entry, iter->ent);
ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu "
"bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
entry->type_id, (void *)entry->call_site, (unsigned long)entry->ptr,
(unsigned long)entry->bytes_req, (unsigned long)entry->bytes_alloc,
(unsigned long)entry->gfp_flags, entry->node);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
static enum print_line_t
kmemtrace_print_free(struct trace_iterator *iter, int flags,
struct trace_event *event)
{
struct trace_seq *s = &iter->seq;
struct kmemtrace_free_entry *entry;
int ret;
trace_assign_type(entry, iter->ent);
ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu\n",
entry->type_id, (void *)entry->call_site,
(unsigned long)entry->ptr);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
static enum print_line_t
kmemtrace_print_alloc_user(struct trace_iterator *iter, int flags,
struct trace_event *event)
{
struct trace_seq *s = &iter->seq;
struct kmemtrace_alloc_entry *entry;
struct kmemtrace_user_event *ev;
struct kmemtrace_user_event_alloc *ev_alloc;
trace_assign_type(entry, iter->ent);
ev = trace_seq_reserve(s, sizeof(*ev));
if (!ev)
return TRACE_TYPE_PARTIAL_LINE;
ev->event_id = KMEMTRACE_USER_ALLOC;
ev->type_id = entry->type_id;
ev->event_size = sizeof(*ev) + sizeof(*ev_alloc);
ev->cpu = iter->cpu;
ev->timestamp = iter->ts;
ev->call_site = entry->call_site;
ev->ptr = (unsigned long)entry->ptr;
ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
if (!ev_alloc)
return TRACE_TYPE_PARTIAL_LINE;
ev_alloc->bytes_req = entry->bytes_req;
ev_alloc->bytes_alloc = entry->bytes_alloc;
ev_alloc->gfp_flags = entry->gfp_flags;
ev_alloc->node = entry->node;
return TRACE_TYPE_HANDLED;
}
static enum print_line_t
kmemtrace_print_free_user(struct trace_iterator *iter, int flags,
struct trace_event *event)
{
struct trace_seq *s = &iter->seq;
struct kmemtrace_free_entry *entry;
struct kmemtrace_user_event *ev;
trace_assign_type(entry, iter->ent);
ev = trace_seq_reserve(s, sizeof(*ev));
if (!ev)
return TRACE_TYPE_PARTIAL_LINE;
ev->event_id = KMEMTRACE_USER_FREE;
ev->type_id = entry->type_id;
ev->event_size = sizeof(*ev);
ev->cpu = iter->cpu;
ev->timestamp = iter->ts;
ev->call_site = entry->call_site;
ev->ptr = (unsigned long)entry->ptr;
return TRACE_TYPE_HANDLED;
}
/* The two other following provide a more minimalistic output */
static enum print_line_t
kmemtrace_print_alloc_compress(struct trace_iterator *iter)
{
struct kmemtrace_alloc_entry *entry;
struct trace_seq *s = &iter->seq;
int ret;
trace_assign_type(entry, iter->ent);
/* Alloc entry */
ret = trace_seq_printf(s, " + ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Type */
switch (entry->type_id) {
case KMEMTRACE_TYPE_KMALLOC:
ret = trace_seq_printf(s, "K ");
break;
case KMEMTRACE_TYPE_CACHE:
ret = trace_seq_printf(s, "C ");
break;
case KMEMTRACE_TYPE_PAGES:
ret = trace_seq_printf(s, "P ");
break;
default:
ret = trace_seq_printf(s, "? ");
}
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Requested */
ret = trace_seq_printf(s, "%4zu ", entry->bytes_req);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Allocated */
ret = trace_seq_printf(s, "%4zu ", entry->bytes_alloc);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Flags
* TODO: would be better to see the name of the GFP flag names
*/
ret = trace_seq_printf(s, "%08x ", entry->gfp_flags);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Pointer to allocated */
ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Node and call site*/
ret = trace_seq_printf(s, "%4d %pf\n", entry->node,
(void *)entry->call_site);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
static enum print_line_t
kmemtrace_print_free_compress(struct trace_iterator *iter)
{
struct kmemtrace_free_entry *entry;
struct trace_seq *s = &iter->seq;
int ret;
trace_assign_type(entry, iter->ent);
/* Free entry */
ret = trace_seq_printf(s, " - ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Type */
switch (entry->type_id) {
case KMEMTRACE_TYPE_KMALLOC:
ret = trace_seq_printf(s, "K ");
break;
case KMEMTRACE_TYPE_CACHE:
ret = trace_seq_printf(s, "C ");
break;
case KMEMTRACE_TYPE_PAGES:
ret = trace_seq_printf(s, "P ");
break;
default:
ret = trace_seq_printf(s, "? ");
}
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Skip requested/allocated/flags */
ret = trace_seq_printf(s, " ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Pointer to allocated */
ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Skip node and print call site*/
ret = trace_seq_printf(s, " %pf\n", (void *)entry->call_site);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
{
struct trace_entry *entry = iter->ent;
if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
return TRACE_TYPE_UNHANDLED;
switch (entry->type) {
case TRACE_KMEM_ALLOC:
return kmemtrace_print_alloc_compress(iter);
case TRACE_KMEM_FREE:
return kmemtrace_print_free_compress(iter);
default:
return TRACE_TYPE_UNHANDLED;
}
}
static struct trace_event_functions kmem_trace_alloc_funcs = {
.trace = kmemtrace_print_alloc,
.binary = kmemtrace_print_alloc_user,
};
static struct trace_event kmem_trace_alloc = {
.type = TRACE_KMEM_ALLOC,
.funcs = &kmem_trace_alloc_funcs,
};
static struct trace_event_functions kmem_trace_free_funcs = {
.trace = kmemtrace_print_free,
.binary = kmemtrace_print_free_user,
};
static struct trace_event kmem_trace_free = {
.type = TRACE_KMEM_FREE,
.funcs = &kmem_trace_free_funcs,
};
static struct tracer kmem_tracer __read_mostly = {
.name = "kmemtrace",
.init = kmem_trace_init,
.reset = kmem_trace_reset,
.print_line = kmemtrace_print_line,
.print_header = kmemtrace_headers,
.flags = &kmem_tracer_flags
};
void kmemtrace_init(void)
{
/* earliest opportunity to start kmem tracing */
}
static int __init init_kmem_tracer(void)
{
if (!register_ftrace_event(&kmem_trace_alloc)) {
pr_warning("Warning: could not register kmem events\n");
return 1;
}
if (!register_ftrace_event(&kmem_trace_free)) {
pr_warning("Warning: could not register kmem events\n");
return 1;
}
if (register_tracer(&kmem_tracer) != 0) {
pr_warning("Warning: could not register the kmem tracer\n");
return 1;
}
return 0;
}
device_initcall(init_kmem_tracer);

12
kernel/trace/trace.h
View File

@ -9,7 +9,6 @@
#include <linux/mmiotrace.h> #include <linux/mmiotrace.h>
#include <linux/tracepoint.h> #include <linux/tracepoint.h>
#include <linux/ftrace.h> #include <linux/ftrace.h>
#include <linux/kmemtrace.h>
#include <linux/hw_breakpoint.h> #include <linux/hw_breakpoint.h>
#include <linux/trace_seq.h> #include <linux/trace_seq.h>
#include <linux/ftrace_event.h> #include <linux/ftrace_event.h>
@ -30,19 +29,12 @@ enum trace_type {
TRACE_GRAPH_RET, TRACE_GRAPH_RET,
TRACE_GRAPH_ENT, TRACE_GRAPH_ENT,
TRACE_USER_STACK, TRACE_USER_STACK,
TRACE_KMEM_ALLOC,
TRACE_KMEM_FREE,
TRACE_BLK, TRACE_BLK,
TRACE_KSYM, TRACE_KSYM,
__TRACE_LAST_TYPE, __TRACE_LAST_TYPE,
}; };
enum kmemtrace_type_id {
KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */
KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */
KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */
};
#undef __field #undef __field
#define __field(type, item) type item; #define __field(type, item) type item;
@ -208,10 +200,6 @@ extern void __ftrace_bad_type(void);
TRACE_GRAPH_ENT); \ TRACE_GRAPH_ENT); \
IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
TRACE_GRAPH_RET); \ TRACE_GRAPH_RET); \
IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
TRACE_KMEM_ALLOC); \
IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
TRACE_KMEM_FREE); \
IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\ IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
__ftrace_bad_type(); \ __ftrace_bad_type(); \
} while (0) } while (0)

35
kernel/trace/trace_entries.h
View File

@ -291,41 +291,6 @@ FTRACE_ENTRY(branch, trace_branch,
__entry->func, __entry->file, __entry->correct) __entry->func, __entry->file, __entry->correct)
); );
FTRACE_ENTRY(kmem_alloc, kmemtrace_alloc_entry,
TRACE_KMEM_ALLOC,
F_STRUCT(
__field( enum kmemtrace_type_id, type_id )
__field( unsigned long, call_site )
__field( const void *, ptr )
__field( size_t, bytes_req )
__field( size_t, bytes_alloc )
__field( gfp_t, gfp_flags )
__field( int, node )
),
F_printk("type:%u call_site:%lx ptr:%p req:%zi alloc:%zi"
" flags:%x node:%d",
__entry->type_id, __entry->call_site, __entry->ptr,
__entry->bytes_req, __entry->bytes_alloc,
__entry->gfp_flags, __entry->node)
);
FTRACE_ENTRY(kmem_free, kmemtrace_free_entry,
TRACE_KMEM_FREE,
F_STRUCT(
__field( enum kmemtrace_type_id, type_id )
__field( unsigned long, call_site )
__field( const void *, ptr )
),
F_printk("type:%u call_site:%lx ptr:%p",
__entry->type_id, __entry->call_site, __entry->ptr)
);
FTRACE_ENTRY(ksym_trace, ksym_trace_entry, FTRACE_ENTRY(ksym_trace, ksym_trace_entry,
TRACE_KSYM, TRACE_KSYM,

1
mm/slab.c
View File

@ -102,7 +102,6 @@
#include <linux/cpu.h> #include <linux/cpu.h>
#include <linux/sysctl.h> #include <linux/sysctl.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/kmemtrace.h>
#include <linux/rcupdate.h> #include <linux/rcupdate.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>

4
mm/slob.c
View File

@ -66,8 +66,10 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/rcupdate.h> #include <linux/rcupdate.h>
#include <linux/list.h> #include <linux/list.h>
#include <linux/kmemtrace.h>
#include <linux/kmemleak.h> #include <linux/kmemleak.h>
#include <trace/events/kmem.h>
#include <asm/atomic.h> #include <asm/atomic.h>
/* /*

1
mm/slub.c
View File

@ -17,7 +17,6 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/proc_fs.h> #include <linux/proc_fs.h>
#include <linux/seq_file.h> #include <linux/seq_file.h>
#include <linux/kmemtrace.h>
#include <linux/kmemcheck.h> #include <linux/kmemcheck.h>
#include <linux/cpu.h> #include <linux/cpu.h>
#include <linux/cpuset.h> #include <linux/cpuset.h>