mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
c73464b1c8
__trace_sched_switch_state() is the last remaining PREEMPT_ACTIVE user, move trace_sched_switch() from prepare_task_switch() to __schedule() and propagate the @preempt argument. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
/*
|
|
* trace context switch
|
|
*
|
|
* Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com>
|
|
*
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/ftrace.h>
|
|
#include <trace/events/sched.h>
|
|
|
|
#include "trace.h"
|
|
|
|
static int sched_ref;
|
|
static DEFINE_MUTEX(sched_register_mutex);
|
|
|
|
static void
|
|
probe_sched_switch(void *ignore, bool preempt,
|
|
struct task_struct *prev, struct task_struct *next)
|
|
{
|
|
if (unlikely(!sched_ref))
|
|
return;
|
|
|
|
tracing_record_cmdline(prev);
|
|
tracing_record_cmdline(next);
|
|
}
|
|
|
|
static void
|
|
probe_sched_wakeup(void *ignore, struct task_struct *wakee)
|
|
{
|
|
if (unlikely(!sched_ref))
|
|
return;
|
|
|
|
tracing_record_cmdline(current);
|
|
}
|
|
|
|
static int tracing_sched_register(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_trace_sched_wakeup(probe_sched_wakeup, NULL);
|
|
if (ret) {
|
|
pr_info("wakeup trace: Couldn't activate tracepoint"
|
|
" probe to kernel_sched_wakeup\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = register_trace_sched_wakeup_new(probe_sched_wakeup, NULL);
|
|
if (ret) {
|
|
pr_info("wakeup trace: Couldn't activate tracepoint"
|
|
" probe to kernel_sched_wakeup_new\n");
|
|
goto fail_deprobe;
|
|
}
|
|
|
|
ret = register_trace_sched_switch(probe_sched_switch, NULL);
|
|
if (ret) {
|
|
pr_info("sched trace: Couldn't activate tracepoint"
|
|
" probe to kernel_sched_switch\n");
|
|
goto fail_deprobe_wake_new;
|
|
}
|
|
|
|
return ret;
|
|
fail_deprobe_wake_new:
|
|
unregister_trace_sched_wakeup_new(probe_sched_wakeup, NULL);
|
|
fail_deprobe:
|
|
unregister_trace_sched_wakeup(probe_sched_wakeup, NULL);
|
|
return ret;
|
|
}
|
|
|
|
static void tracing_sched_unregister(void)
|
|
{
|
|
unregister_trace_sched_switch(probe_sched_switch, NULL);
|
|
unregister_trace_sched_wakeup_new(probe_sched_wakeup, NULL);
|
|
unregister_trace_sched_wakeup(probe_sched_wakeup, NULL);
|
|
}
|
|
|
|
static void tracing_start_sched_switch(void)
|
|
{
|
|
mutex_lock(&sched_register_mutex);
|
|
if (!(sched_ref++))
|
|
tracing_sched_register();
|
|
mutex_unlock(&sched_register_mutex);
|
|
}
|
|
|
|
static void tracing_stop_sched_switch(void)
|
|
{
|
|
mutex_lock(&sched_register_mutex);
|
|
if (!(--sched_ref))
|
|
tracing_sched_unregister();
|
|
mutex_unlock(&sched_register_mutex);
|
|
}
|
|
|
|
void tracing_start_cmdline_record(void)
|
|
{
|
|
tracing_start_sched_switch();
|
|
}
|
|
|
|
void tracing_stop_cmdline_record(void)
|
|
{
|
|
tracing_stop_sched_switch();
|
|
}
|