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tracing: add lockdep tracepoints for lock acquire/release 

Augment the traces with lock names when lockdep is available:

 1)               |  down_read_trylock() {
 1)               |    _spin_lock_irqsave() {
 1)               |      /* lock_acquire: &sem->wait_lock */
 1)   4.201 us    |    }
 1)               |    _spin_unlock_irqrestore() {
 1)               |      /* lock_release: &sem->wait_lock */
 1)   3.523 us    |    }
 1)               |  /* lock_acquire: try read &mm->mmap_sem */
 1) + 13.386 us   |  }
 1)   1.635 us    |  find_vma();
 1)               |  handle_mm_fault() {
 1)               |    __do_fault() {
 1)               |      filemap_fault() {
 1)               |        find_lock_page() {
 1)               |          find_get_page() {
 1)               |            /* lock_acquire: read rcu_read_lock */
 1)               |            /* lock_release: rcu_read_lock */
 1)   5.697 us    |          }
 1)   8.158 us    |        }
 1) + 11.079 us   |      }
 1)               |      _spin_lock() {
 1)               |        /* lock_acquire: __pte_lockptr(page) */
 1)   3.949 us    |      }
 1)   1.460 us    |      page_add_file_rmap();
 1)               |      _spin_unlock() {
 1)               |        /* lock_release: __pte_lockptr(page) */
 1)   3.115 us    |      }
 1)               |      unlock_page() {
 1)   1.421 us    |        page_waitqueue();
 1)   1.220 us    |        __wake_up_bit();
 1)   6.519 us    |      }
 1) + 34.328 us   |    }
 1) + 37.452 us   |  }
 1)               |  up_read() {
 1)               |  /* lock_release: &mm->mmap_sem */
 1)               |    _spin_lock_irqsave() {
 1)               |      /* lock_acquire: &sem->wait_lock */
 1)   3.865 us    |    }
 1)               |    _spin_unlock_irqrestore() {
 1)               |      /* lock_release: &sem->wait_lock */
 1)   8.562 us    |    }
 1) + 17.370 us   |  }

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: =?ISO-8859-1?Q?T=F6r=F6k?= Edwin <edwintorok@gmail.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1236166375.5330.7209.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-03-04 12:32:55 +01:00 committed by Ingo Molnar
parent 28b1bd1cbc
commit efed792d67
7 changed files with 82 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/trace/lockdep.h Normal file
View File

@ -0,0 +1,9 @@
#ifndef _TRACE_LOCKDEP_H
#define _TRACE_LOCKDEP_H
#include <linux/lockdep.h>
#include <linux/tracepoint.h>
#include <trace/lockdep_event_types.h>
#endif

44
include/trace/lockdep_event_types.h Normal file
View File

@ -0,0 +1,44 @@
#ifndef TRACE_EVENT_FORMAT
# error Do not include this file directly.
# error Unless you know what you are doing.
#endif
#undef TRACE_SYSTEM
#define TRACE_SYSTEM lock
#ifdef CONFIG_LOCKDEP
TRACE_FORMAT(lock_acquire,
TPPROTO(struct lockdep_map *lock, unsigned int subclass,
int trylock, int read, int check,
struct lockdep_map *next_lock, unsigned long ip),
TPARGS(lock, subclass, trylock, read, check, next_lock, ip),
TPFMT("%s%s%s", trylock ? "try " : "",
read ? "read " : "", lock->name)
);
TRACE_FORMAT(lock_release,
TPPROTO(struct lockdep_map *lock, int nested, unsigned long ip),
TPARGS(lock, nested, ip),
TPFMT("%s", lock->name)
);
#ifdef CONFIG_LOCK_STAT
TRACE_FORMAT(lock_contended,
TPPROTO(struct lockdep_map *lock, unsigned long ip),
TPARGS(lock, ip),
TPFMT("%s", lock->name)
);
TRACE_FORMAT(lock_acquired,
TPPROTO(struct lockdep_map *lock, unsigned long ip),
TPARGS(lock, ip),
TPFMT("%s", lock->name)
);
#endif
#endif
#undef TRACE_SYSTEM

1
include/trace/trace_event_types.h
View File

@ -2,3 +2,4 @@
#include <trace/sched_event_types.h>
#include <trace/irq_event_types.h>
#include <trace/lockdep_event_types.h>

1
include/trace/trace_events.h
View File

@ -2,3 +2,4 @@
#include <trace/sched.h>
#include <trace/irq.h>
#include <trace/lockdep.h>

17
kernel/lockdep.c
View File

@ -42,6 +42,7 @@
#include <linux/hash.h>
#include <linux/ftrace.h>
#include <linux/stringify.h>
#include <trace/lockdep.h>
#include <asm/sections.h>
@ -2913,6 +2914,8 @@ void lock_set_class(struct lockdep_map *lock, const char *name,
}
EXPORT_SYMBOL_GPL(lock_set_class);
DEFINE_TRACE(lock_acquire);
/*
* We are not always called with irqs disabled - do that here,
* and also avoid lockdep recursion:
@ -2923,6 +2926,8 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
{
unsigned long flags;
trace_lock_acquire(lock, subclass, trylock, read, check, nest_lock, ip);
if (unlikely(current->lockdep_recursion))
return;
@ -2937,11 +2942,15 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
}
EXPORT_SYMBOL_GPL(lock_acquire);
DEFINE_TRACE(lock_release);
void lock_release(struct lockdep_map *lock, int nested,
unsigned long ip)
{
unsigned long flags;
trace_lock_release(lock, nested, ip);
if (unlikely(current->lockdep_recursion))
return;
@ -3090,10 +3099,14 @@ found_it:
lock->ip = ip;
}
DEFINE_TRACE(lock_contended);
void lock_contended(struct lockdep_map *lock, unsigned long ip)
{
unsigned long flags;
trace_lock_contended(lock, ip);
if (unlikely(!lock_stat))
return;
@ -3109,10 +3122,14 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
}
EXPORT_SYMBOL_GPL(lock_contended);
DEFINE_TRACE(lock_acquired);
void lock_acquired(struct lockdep_map *lock, unsigned long ip)
{
unsigned long flags;
trace_lock_acquired(lock, ip);
if (unlikely(!lock_stat))
return;

14
kernel/trace/trace.c
View File

@ -623,7 +623,7 @@ static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
static unsigned map_cmdline_to_pid[SAVED_CMDLINES];
static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN];
static int cmdline_idx;
static DEFINE_SPINLOCK(trace_cmdline_lock);
static raw_spinlock_t trace_cmdline_lock = __RAW_SPIN_LOCK_UNLOCKED;
/* temporary disable recording */
static atomic_t trace_record_cmdline_disabled __read_mostly;
@ -735,7 +735,7 @@ static void trace_save_cmdline(struct task_struct *tsk)
* nor do we want to disable interrupts,
* so if we miss here, then better luck next time.
*/
if (!spin_trylock(&trace_cmdline_lock))
if (!__raw_spin_trylock(&trace_cmdline_lock))
return;
idx = map_pid_to_cmdline[tsk->pid];
@ -753,7 +753,7 @@ static void trace_save_cmdline(struct task_struct *tsk)
memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN);
spin_unlock(&trace_cmdline_lock);
__raw_spin_unlock(&trace_cmdline_lock);
}
char *trace_find_cmdline(int pid)
@ -3751,7 +3751,7 @@ static __init int tracer_init_debugfs(void)
int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
{
static DEFINE_SPINLOCK(trace_buf_lock);
static raw_spinlock_t trace_buf_lock = __RAW_SPIN_LOCK_UNLOCKED;
static char trace_buf[TRACE_BUF_SIZE];
struct ring_buffer_event *event;
@ -3773,7 +3773,8 @@ int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
goto out;
pause_graph_tracing();
spin_lock_irqsave(&trace_buf_lock, irq_flags);
raw_local_irq_save(irq_flags);
__raw_spin_lock(&trace_buf_lock);
len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
len = min(len, TRACE_BUF_SIZE-1);
@ -3792,7 +3793,8 @@ int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
ring_buffer_unlock_commit(tr->buffer, event);
out_unlock:
spin_unlock_irqrestore(&trace_buf_lock, irq_flags);
__raw_spin_unlock(&trace_buf_lock);
raw_local_irq_restore(irq_flags);
unpause_graph_tracing();
out:
preempt_enable_notrace();

4
kernel/trace/trace_events_stage_3.h
View File

@ -5,7 +5,7 @@
*
* static void ftrace_event_<call>(proto)
* {
* event_trace_printk(_RET_IP_, "(<call>) " <fmt>);
* event_trace_printk(_RET_IP_, "<call>: " <fmt>);
* }
*
* static int ftrace_reg_event_<call>(void)
@ -112,7 +112,7 @@
#define _TRACE_FORMAT(call, proto, args, fmt) \
static void ftrace_event_##call(proto) \
{ \
event_trace_printk(_RET_IP_, "(" #call ") " fmt); \
event_trace_printk(_RET_IP_, #call ": " fmt); \
} \
\
static int ftrace_reg_event_##call(void) \