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Commit a8d7ad52 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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sched/tracing: Allow tracing the preemption decision on wakeup 



Thomas noted that we do the wakeup preemption check after the
wakeup trace point, this means the tracepoint cannot test/report
this decision; which is rather important for latency sensitive
workloads. Therefore move the tracepoint after doing the
preemption check.

Suggested-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Acked-by: default avatarPaul Turner <pjt@google.com>
Cc: Mike Galbraith <efault@gmx.de>
Link: http://lkml.kernel.org/r/1363254519.26965.9.camel@laptop


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent e75c8b47

kernel/sched/core.c

+1 −1
Original line number Diff line number Diff line
@@ -1288,8 +1288,8 @@ static void ttwu_activate(struct rq *rq, struct task_struct *p, int en_flags) 
static void

ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags)

{

	trace_sched_wakeup(p, true);

	check_preempt_curr(rq, p, wake_flags);

	trace_sched_wakeup(p, true);



	p->state = TASK_RUNNING;

#ifdef CONFIG_SMP