sched: add latency tracer callbacks to the scheduler
add 3 lightweight callbacks to the tracer backend.
zero impact if tracing is turned off.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/sched.c b/kernel/sched.c
index cfa222a..463dcdb 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2467,6 +2467,7 @@
out_activate:
#endif /* CONFIG_SMP */
+ ftrace_wake_up_task(p, rq->curr);
schedstat_inc(p, se.nr_wakeups);
if (sync)
schedstat_inc(p, se.nr_wakeups_sync);
@@ -2611,6 +2612,7 @@
p->sched_class->task_new(rq, p);
inc_nr_running(rq);
}
+ ftrace_wake_up_new_task(p, rq->curr);
check_preempt_curr(rq, p);
#ifdef CONFIG_SMP
if (p->sched_class->task_wake_up)
@@ -2783,6 +2785,7 @@
struct mm_struct *mm, *oldmm;
prepare_task_switch(rq, prev, next);
+ ftrace_ctx_switch(prev, next);
mm = next->mm;
oldmm = prev->active_mm;
/*