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Merge branch 'kmemtrace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'kmemtrace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  kmemtrace: trace kfree() calls with NULL or zero-length objects
  kmemtrace: small cleanups
  kmemtrace: restore original tracing data binary format, improve ABI
  kmemtrace: kmemtrace_alloc() must fill type_id
  kmemtrace: use tracepoints
  kmemtrace, rcu: don't include unnecessary headers, allow kmemtrace w/ tracepoints
  kmemtrace, rcu: fix rcupreempt.c data structure dependencies
  kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies
  kmemtrace, rcu: fix linux/rcutree.h and linux/rcuclassic.h dependencies
  kmemtrace, mm: fix slab.h dependency problem in mm/failslab.c
  kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_unlzma.c
  kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_bunzip2.c
  kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_inflate.c
  kmemtrace, squashfs: fix slab.h dependency problem in squasfs
  kmemtrace, befs: fix slab.h dependency problem
  kmemtrace, security: fix linux/key.h header file dependencies
  kmemtrace, fs: fix linux/fdtable.h header file dependencies
  kmemtrace, fs: uninline simple_transaction_set()
  kmemtrace, fs, security: move alloc_secdata() and free_secdata() to linux/security.h
This commit is contained in:
Linus Torvalds
2009-04-06 13:30:00 -07:00
parent a63856252d 2121db74ba
commit 12fe32e4f9
29 changed files with 494 additions and 337 deletions
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323
kernel/trace/kmemtrace.c
View File

@@ -6,14 +6,16 @@
* Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
*/
#include <linux/dcache.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/tracepoint.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/dcache.h>
#include <linux/fs.h>
#include <trace/kmemtrace.h>
#include "trace.h"
#include "trace_output.h"
#include "trace.h"
/* Select an alternative, minimalistic output than the original one */
#define TRACE_KMEM_OPT_MINIMAL 0x1
@@ -25,14 +27,156 @@ static struct tracer_opt kmem_opts[] = {
};
static struct tracer_flags kmem_tracer_flags = {
.val = 0,
.opts = kmem_opts
.val = 0,
.opts = kmem_opts
};
static bool kmem_tracing_enabled __read_mostly;
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 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;
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 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;
ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
static void kmemtrace_kmalloc(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(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(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(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(unsigned long call_site, const void *ptr)
{
kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
}
static void kmemtrace_kmem_cache_free(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);
if (err)
return err;
err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
if (err)
return err;
err = register_trace_kmalloc_node(kmemtrace_kmalloc_node);
if (err)
return err;
err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
if (err)
return err;
err = register_trace_kfree(kmemtrace_kfree);
if (err)
return err;
err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
return err;
}
static void kmemtrace_stop_probes(void)
{
unregister_trace_kmalloc(kmemtrace_kmalloc);
unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
unregister_trace_kmalloc_node(kmemtrace_kmalloc_node);
unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
unregister_trace_kfree(kmemtrace_kfree);
unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
}
static int kmem_trace_init(struct trace_array *tr)
{
int cpu;
@@ -41,14 +185,14 @@ static int kmem_trace_init(struct trace_array *tr)
for_each_cpu_mask(cpu, cpu_possible_map)
tracing_reset(tr, cpu);
kmem_tracing_enabled = true;
kmemtrace_start_probes();
return 0;
}
static void kmem_trace_reset(struct trace_array *tr)
{
kmem_tracing_enabled = false;
kmemtrace_stop_probes();
}
static void kmemtrace_headers(struct seq_file *s)
@@ -66,47 +210,84 @@ static void kmemtrace_headers(struct seq_file *s)
}
/*
* The two following functions give the original output from kmemtrace,
* or something close to....perhaps they need some missing things
* 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_original(struct trace_iterator *iter,
struct kmemtrace_alloc_entry *entry)
kmemtrace_print_alloc_user(struct trace_iterator *iter,
struct kmemtrace_alloc_entry *entry)
{
struct kmemtrace_user_event_alloc *ev_alloc;
struct trace_seq *s = &iter->seq;
int ret;
struct kmemtrace_user_event *ev;
/* Taken from the old linux/kmemtrace.h */
ret = trace_seq_printf(s, "type_id %d call_site %lu ptr %lu "
"bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
entry->type_id, 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)
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_original(struct trace_iterator *iter,
struct kmemtrace_free_entry *entry)
kmemtrace_print_free_user(struct trace_iterator *iter,
struct kmemtrace_free_entry *entry)
{
struct trace_seq *s = &iter->seq;
int ret;
struct kmemtrace_user_event *ev;
/* Taken from the old linux/kmemtrace.h */
ret = trace_seq_printf(s, "type_id %d call_site %lu ptr %lu\n",
entry->type_id, entry->call_site, (unsigned long) entry->ptr);
if (!ret)
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,
@@ -178,7 +359,7 @@ kmemtrace_print_alloc_compress(struct trace_iterator *iter,
static enum print_line_t
kmemtrace_print_free_compress(struct trace_iterator *iter,
struct kmemtrace_free_entry *entry)
struct kmemtrace_free_entry *entry)
{
struct trace_seq *s = &iter->seq;
int ret;
@@ -239,20 +420,22 @@ static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
switch (entry->type) {
case TRACE_KMEM_ALLOC: {
struct kmemtrace_alloc_entry *field;
trace_assign_type(field, entry);
if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
return kmemtrace_print_alloc_compress(iter, field);
else
return kmemtrace_print_alloc_original(iter, field);
return kmemtrace_print_alloc_user(iter, field);
}
case TRACE_KMEM_FREE: {
struct kmemtrace_free_entry *field;
trace_assign_type(field, entry);
if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
return kmemtrace_print_free_compress(iter, field);
else
return kmemtrace_print_free_original(iter, field);
return kmemtrace_print_free_user(iter, field);
}
default:
@@ -260,70 +443,13 @@ static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
}
}
/* Trace allocations */
void kmemtrace_mark_alloc_node(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 ring_buffer_event *event;
struct kmemtrace_alloc_entry *entry;
struct trace_array *tr = kmemtrace_array;
if (!kmem_tracing_enabled)
return;
event = trace_buffer_lock_reserve(tr, TRACE_KMEM_ALLOC,
sizeof(*entry), 0, 0);
if (!event)
return;
entry = ring_buffer_event_data(event);
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;
trace_buffer_unlock_commit(tr, event, 0, 0);
}
EXPORT_SYMBOL(kmemtrace_mark_alloc_node);
void kmemtrace_mark_free(enum kmemtrace_type_id type_id,
unsigned long call_site,
const void *ptr)
{
struct ring_buffer_event *event;
struct kmemtrace_free_entry *entry;
struct trace_array *tr = kmemtrace_array;
if (!kmem_tracing_enabled)
return;
event = trace_buffer_lock_reserve(tr, TRACE_KMEM_FREE,
sizeof(*entry), 0, 0);
if (!event)
return;
entry = ring_buffer_event_data(event);
entry->type_id = type_id;
entry->call_site = call_site;
entry->ptr = ptr;
trace_buffer_unlock_commit(tr, event, 0, 0);
}
EXPORT_SYMBOL(kmemtrace_mark_free);
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
.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)
@@ -335,5 +461,4 @@ static int __init init_kmem_tracer(void)
{
return register_tracer(&kmem_tracer);
}
device_initcall(init_kmem_tracer);

6
kernel/trace/trace.h
View File

@@ -182,6 +182,12 @@ struct trace_power {
struct power_trace state_data;
};
enum kmemtrace_type_id {
KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */
KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */
KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */
};
struct kmemtrace_alloc_entry {
struct trace_entry ent;
enum kmemtrace_type_id type_id;