mirror of
https://github.com/torvalds/linux.git
synced 2024-11-12 07:01:57 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
189 lines
3.1 KiB
C
189 lines
3.1 KiB
C
/**
|
|
* @file oprof.c
|
|
*
|
|
* @remark Copyright 2002 OProfile authors
|
|
* @remark Read the file COPYING
|
|
*
|
|
* @author John Levon <levon@movementarian.org>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/oprofile.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <asm/semaphore.h>
|
|
|
|
#include "oprof.h"
|
|
#include "event_buffer.h"
|
|
#include "cpu_buffer.h"
|
|
#include "buffer_sync.h"
|
|
#include "oprofile_stats.h"
|
|
|
|
struct oprofile_operations oprofile_ops;
|
|
|
|
unsigned long oprofile_started;
|
|
unsigned long backtrace_depth;
|
|
static unsigned long is_setup;
|
|
static DECLARE_MUTEX(start_sem);
|
|
|
|
/* timer
|
|
0 - use performance monitoring hardware if available
|
|
1 - use the timer int mechanism regardless
|
|
*/
|
|
static int timer = 0;
|
|
|
|
int oprofile_setup(void)
|
|
{
|
|
int err;
|
|
|
|
down(&start_sem);
|
|
|
|
if ((err = alloc_cpu_buffers()))
|
|
goto out;
|
|
|
|
if ((err = alloc_event_buffer()))
|
|
goto out1;
|
|
|
|
if (oprofile_ops.setup && (err = oprofile_ops.setup()))
|
|
goto out2;
|
|
|
|
/* Note even though this starts part of the
|
|
* profiling overhead, it's necessary to prevent
|
|
* us missing task deaths and eventually oopsing
|
|
* when trying to process the event buffer.
|
|
*/
|
|
if ((err = sync_start()))
|
|
goto out3;
|
|
|
|
is_setup = 1;
|
|
up(&start_sem);
|
|
return 0;
|
|
|
|
out3:
|
|
if (oprofile_ops.shutdown)
|
|
oprofile_ops.shutdown();
|
|
out2:
|
|
free_event_buffer();
|
|
out1:
|
|
free_cpu_buffers();
|
|
out:
|
|
up(&start_sem);
|
|
return err;
|
|
}
|
|
|
|
|
|
/* Actually start profiling (echo 1>/dev/oprofile/enable) */
|
|
int oprofile_start(void)
|
|
{
|
|
int err = -EINVAL;
|
|
|
|
down(&start_sem);
|
|
|
|
if (!is_setup)
|
|
goto out;
|
|
|
|
err = 0;
|
|
|
|
if (oprofile_started)
|
|
goto out;
|
|
|
|
oprofile_reset_stats();
|
|
|
|
if ((err = oprofile_ops.start()))
|
|
goto out;
|
|
|
|
oprofile_started = 1;
|
|
out:
|
|
up(&start_sem);
|
|
return err;
|
|
}
|
|
|
|
|
|
/* echo 0>/dev/oprofile/enable */
|
|
void oprofile_stop(void)
|
|
{
|
|
down(&start_sem);
|
|
if (!oprofile_started)
|
|
goto out;
|
|
oprofile_ops.stop();
|
|
oprofile_started = 0;
|
|
/* wake up the daemon to read what remains */
|
|
wake_up_buffer_waiter();
|
|
out:
|
|
up(&start_sem);
|
|
}
|
|
|
|
|
|
void oprofile_shutdown(void)
|
|
{
|
|
down(&start_sem);
|
|
sync_stop();
|
|
if (oprofile_ops.shutdown)
|
|
oprofile_ops.shutdown();
|
|
is_setup = 0;
|
|
free_event_buffer();
|
|
free_cpu_buffers();
|
|
up(&start_sem);
|
|
}
|
|
|
|
|
|
int oprofile_set_backtrace(unsigned long val)
|
|
{
|
|
int err = 0;
|
|
|
|
down(&start_sem);
|
|
|
|
if (oprofile_started) {
|
|
err = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (!oprofile_ops.backtrace) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
backtrace_depth = val;
|
|
|
|
out:
|
|
up(&start_sem);
|
|
return err;
|
|
}
|
|
|
|
static int __init oprofile_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = oprofile_arch_init(&oprofile_ops);
|
|
|
|
if (err < 0 || timer) {
|
|
printk(KERN_INFO "oprofile: using timer interrupt.\n");
|
|
oprofile_timer_init(&oprofile_ops);
|
|
}
|
|
|
|
err = oprofilefs_register();
|
|
if (err)
|
|
oprofile_arch_exit();
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
static void __exit oprofile_exit(void)
|
|
{
|
|
oprofilefs_unregister();
|
|
oprofile_arch_exit();
|
|
}
|
|
|
|
|
|
module_init(oprofile_init);
|
|
module_exit(oprofile_exit);
|
|
|
|
module_param_named(timer, timer, int, 0644);
|
|
MODULE_PARM_DESC(timer, "force use of timer interrupt");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("John Levon <levon@movementarian.org>");
|
|
MODULE_DESCRIPTION("OProfile system profiler");
|