Commit a8d7ad52 authored Mar 14, 2013 by Peter Zijlstra Committed by Ingo Molnar Mar 18, 2013

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


Signed-off-by: Ingo 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

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