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Commit 89363381 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: Change the ttwu() success details 



try_to_wake_up() would only return a success when it would have to
place a task on a rq, change that to every time we change p->state to
TASK_RUNNING, because that's the real measure of wakeups.

This results in that success is always true for the tracepoints.

Reviewed-by: default avatarFrank Rowand <frank.rowand@am.sony.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110405152728.866866929@chello.nl
parent c2f7115e

kernel/sched.c

+7 −9
Original line number Diff line number Diff line
@@ -2427,10 +2427,10 @@ static inline void ttwu_activate(struct task_struct *p, struct rq *rq, 
		wq_worker_waking_up(p, cpu_of(rq));

}



static inline void ttwu_post_activation(struct task_struct *p, struct rq *rq,

					int wake_flags, bool success)

static void

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

{

	trace_sched_wakeup(p, success);

	trace_sched_wakeup(p, true);

	check_preempt_curr(rq, p, wake_flags);



	p->state = TASK_RUNNING;
@@ -2546,9 +2546,9 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, 
#endif /* CONFIG_SMP */

	ttwu_activate(p, rq, wake_flags & WF_SYNC, orig_cpu != cpu,

		      cpu == this_cpu, en_flags);

	success = 1;

out_running:

	ttwu_post_activation(p, rq, wake_flags, success);

	ttwu_post_activation(p, rq, wake_flags);

	success = 1;

out:

	task_rq_unlock(rq, &flags);

	put_cpu();
@@ -2567,7 +2567,6 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, 
static void try_to_wake_up_local(struct task_struct *p)

{

	struct rq *rq = task_rq(p);

	bool success = false;



	BUG_ON(rq != this_rq());

	BUG_ON(p == current);
@@ -2582,9 +2581,8 @@ static void try_to_wake_up_local(struct task_struct *p) 
			schedstat_inc(rq, ttwu_local);

		}

		ttwu_activate(p, rq, false, false, true, ENQUEUE_WAKEUP);

		success = true;

	}

	ttwu_post_activation(p, rq, 0, success);

	ttwu_post_activation(p, rq, 0);

}



/**
@@ -2747,7 +2745,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags) 


	rq = task_rq_lock(p, &flags);

	activate_task(rq, p, 0);

	trace_sched_wakeup_new(p, 1);

	trace_sched_wakeup_new(p, true);

	check_preempt_curr(rq, p, WF_FORK);

#ifdef CONFIG_SMP

	if (p->sched_class->task_woken)