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sched/fair: Make the entity load aging on attaching tunable 

In case there are problems with the aging on attach, provide a debug
knob to turn it off.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: yuyang.du@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2015-09-11 16:10:59 +02:00 committed by Ingo Molnar
parent 6efdb105d3
commit a9280514bf
2 changed files with 6 additions and 0 deletions
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4
kernel/sched/fair.c
View File

@ -2712,6 +2712,9 @@ static inline void update_load_avg(struct sched_entity *se, int update_tg)
static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{ {
if (!sched_feat(ATTACH_AGE_LOAD))
goto skip_aging;
/* /*
* If we got migrated (either between CPUs or between cgroups) we'll * If we got migrated (either between CPUs or between cgroups) we'll
* have aged the average right before clearing @last_update_time. * have aged the average right before clearing @last_update_time.
@ -2726,6 +2729,7 @@ static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
*/ */
} }
skip_aging:
se->avg.last_update_time = cfs_rq->avg.last_update_time; se->avg.last_update_time = cfs_rq->avg.last_update_time;
cfs_rq->avg.load_avg += se->avg.load_avg; cfs_rq->avg.load_avg += se->avg.load_avg;
cfs_rq->avg.load_sum += se->avg.load_sum; cfs_rq->avg.load_sum += se->avg.load_sum;

2
kernel/sched/features.h
View File

@ -73,6 +73,8 @@ SCHED_FEAT(FORCE_SD_OVERLAP, false)
SCHED_FEAT(RT_RUNTIME_SHARE, true) SCHED_FEAT(RT_RUNTIME_SHARE, true)
SCHED_FEAT(LB_MIN, false) SCHED_FEAT(LB_MIN, false)
SCHED_FEAT(ATTACH_AGE_LOAD, true)
/* /*
* Apply the automatic NUMA scheduling policy. Enabled automatically * Apply the automatic NUMA scheduling policy. Enabled automatically
* at runtime if running on a NUMA machine. Can be controlled via * at runtime if running on a NUMA machine. Can be controlled via