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sched/fair: Align PELT windows between cfs_rq and its se

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The PELT _sum values are a saw-tooth function, dropping on the decay
edge and then growing back up again during the window.

When these window-edges are not aligned between cfs_rq and se, we can
have the situation where, for example, on dequeue, the se decays
first.

Its _sum values will be small(er), while the cfs_rq _sum values will
still be on their way up. Because of this, the subtraction:
cfs_rq->avg._sum -= se->avg._sum will result in a positive value. This
will then, once the cfs_rq reaches an edge, translate into its _avg
value jumping up.

This is especially visible with the runnable_load bits, since they get
added/subtracted a lot.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2017-05-12 14:16:30 +02:00 committed by Ingo Molnar
parent 144d8487bc
commit f207934fb7
1 changed files with 31 additions and 14 deletions
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45
kernel/sched/fair.c
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@ -716,13 +716,8 @@ void init_entity_runnable_average(struct sched_entity *se)
{
struct sched_avg *sa = &se->avg;
sa->last_update_time = 0;
/*
* sched_avg's period_contrib should be strictly less then 1024, so
* we give it 1023 to make sure it is almost a period (1024us), and
* will definitely be update (after enqueue).
*/
sa->period_contrib = 1023;
memset(sa, 0, sizeof(*sa));
/*
* Tasks are intialized with full load to be seen as heavy tasks until
* they get a chance to stabilize to their real load level.
@ -731,13 +726,9 @@ void init_entity_runnable_average(struct sched_entity *se)
*/
if (entity_is_task(se))
sa->runnable_load_avg = sa->load_avg = scale_load_down(se->load.weight);
sa->runnable_load_sum = sa->load_sum = LOAD_AVG_MAX;
/*
* At this point, util_avg won't be used in select_task_rq_fair anyway
*/
sa->util_avg = 0;
sa->util_sum = 0;
se->runnable_weight = se->load.weight;
/* when this task enqueue'ed, it will contribute to its cfs_rq's load_avg */
}
@ -785,7 +776,6 @@ void post_init_entity_util_avg(struct sched_entity *se)
} else {
sa->util_avg = cap;
}
sa->util_sum = sa->util_avg * LOAD_AVG_MAX;
}
if (entity_is_task(se)) {
@ -3632,7 +3622,34 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
*/
static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
u32 divider = LOAD_AVG_MAX - 1024 + cfs_rq->avg.period_contrib;
/*
* When we attach the @se to the @cfs_rq, we must align the decay
* window because without that, really weird and wonderful things can
* happen.
*
* XXX illustrate
*/
se->avg.last_update_time = cfs_rq->avg.last_update_time;
se->avg.period_contrib = cfs_rq->avg.period_contrib;
/*
* Hell(o) Nasty stuff.. we need to recompute _sum based on the new
* period_contrib. This isn't strictly correct, but since we're
* entirely outside of the PELT hierarchy, nobody cares if we truncate
* _sum a little.
*/
se->avg.util_sum = se->avg.util_avg * divider;
se->avg.load_sum = divider;
if (se_weight(se)) {
se->avg.load_sum =
div_u64(se->avg.load_avg * se->avg.load_sum, se_weight(se));
}
se->avg.runnable_load_sum = se->avg.load_sum;
enqueue_load_avg(cfs_rq, se);
cfs_rq->avg.util_avg += se->avg.util_avg;
cfs_rq->avg.util_sum += se->avg.util_sum;