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Commit d7c01d27 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: Clean up ttwu() stats 



Collect all ttwu() stat code into a single function and ensure its
always called for an actual wakeup (changing p->state to
TASK_RUNNING).

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/20110405152728.908177058@chello.nl
parent 89363381

kernel/sched.c

+40 −35
Original line number Diff line number Diff line
@@ -2406,20 +2406,43 @@ static void update_avg(u64 *avg, u64 sample) 
}

#endif



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

				 bool is_sync, bool is_migrate, bool is_local,

				 unsigned long en_flags)

static void

ttwu_stat(struct rq *rq, struct task_struct *p, int cpu, int wake_flags)

{

#ifdef CONFIG_SCHEDSTATS

#ifdef CONFIG_SMP

	int this_cpu = smp_processor_id();



	if (cpu == this_cpu) {

		schedstat_inc(rq, ttwu_local);

		schedstat_inc(p, se.statistics.nr_wakeups_local);

	} else {

		struct sched_domain *sd;



		schedstat_inc(p, se.statistics.nr_wakeups_remote);

		for_each_domain(this_cpu, sd) {

			if (cpumask_test_cpu(cpu, sched_domain_span(sd))) {

				schedstat_inc(sd, ttwu_wake_remote);

				break;

			}

		}

	}

#endif /* CONFIG_SMP */



	schedstat_inc(rq, ttwu_count);

	schedstat_inc(p, se.statistics.nr_wakeups);

	if (is_sync)



	if (wake_flags & WF_SYNC)

		schedstat_inc(p, se.statistics.nr_wakeups_sync);

	if (is_migrate)



	if (cpu != task_cpu(p))

		schedstat_inc(p, se.statistics.nr_wakeups_migrate);

	if (is_local)

		schedstat_inc(p, se.statistics.nr_wakeups_local);

	else

		schedstat_inc(p, se.statistics.nr_wakeups_remote);



#endif /* CONFIG_SCHEDSTATS */

}



static void ttwu_activate(struct rq *rq, struct task_struct *p, int en_flags)

{

	activate_task(rq, p, en_flags);



	/* if a worker is waking up, notify workqueue */
@@ -2481,12 +2504,12 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, 
	if (!(p->state & state))

		goto out;



	cpu = task_cpu(p);



	if (p->se.on_rq)

		goto out_running;



	cpu = task_cpu(p);

	orig_cpu = cpu;



#ifdef CONFIG_SMP

	if (unlikely(task_running(rq, p)))

		goto out_activate;
@@ -2527,27 +2550,12 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, 
	WARN_ON(task_cpu(p) != cpu);

	WARN_ON(p->state != TASK_WAKING);



#ifdef CONFIG_SCHEDSTATS

	schedstat_inc(rq, ttwu_count);

	if (cpu == this_cpu)

		schedstat_inc(rq, ttwu_local);

	else {

		struct sched_domain *sd;

		for_each_domain(this_cpu, sd) {

			if (cpumask_test_cpu(cpu, sched_domain_span(sd))) {

				schedstat_inc(sd, ttwu_wake_remote);

				break;

			}

		}

	}

#endif /* CONFIG_SCHEDSTATS */



out_activate:

#endif /* CONFIG_SMP */

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

		      cpu == this_cpu, en_flags);

	ttwu_activate(rq, p, en_flags);

out_running:

	ttwu_post_activation(p, rq, wake_flags);

	ttwu_stat(rq, p, cpu, wake_flags);

	success = 1;

out:

	task_rq_unlock(rq, &flags);
@@ -2575,14 +2583,11 @@ static void try_to_wake_up_local(struct task_struct *p) 
	if (!(p->state & TASK_NORMAL))

		return;



	if (!p->se.on_rq) {

		if (likely(!task_running(rq, p))) {

			schedstat_inc(rq, ttwu_count);

			schedstat_inc(rq, ttwu_local);

		}

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

	}

	if (!p->se.on_rq)

		ttwu_activate(rq, p, ENQUEUE_WAKEUP);



	ttwu_post_activation(p, rq, 0);

	ttwu_stat(rq, p, smp_processor_id(), 0);

}



/**