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sched: Clean up ttwu() stats

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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: Frank 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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110405152728.908177058@chello.nl
This commit is contained in:
Peter Zijlstra 2011-04-05 17:23:43 +02:00 committed by Ingo Molnar
parent 893633817f
commit d7c01d27ab
1 changed files with 43 additions and 38 deletions
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81
kernel/sched.c
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@ -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)
{
schedstat_inc(p, se.statistics.nr_wakeups);
if (is_sync)
schedstat_inc(p, se.statistics.nr_wakeups_sync);
if (is_migrate)
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);
#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 (wake_flags & WF_SYNC)
schedstat_inc(p, se.statistics.nr_wakeups_sync);
if (cpu != task_cpu(p))
schedstat_inc(p, se.statistics.nr_wakeups_migrate);
#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);
}
/**