diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2015-09-11 16:10:59 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-09-13 09:52:48 +0200 |
| commit | a9280514bf1e54775b8d7cd93d87c05c2b5273e6 (patch) | |
| tree | e435547eb7fba7d5b235e04eb0105c71718b4c22 | |
| parent | 6efdb105d392da3ad5cb4ef951aed373cd049813 (diff) | |
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>
| -rw-r--r-- | kernel/sched/fair.c | 4 | ||||
| -rw-r--r-- | kernel/sched/features.h | 2 |
2 files changed, 6 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 5143ea0cb55b..5cd7054aac85 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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) { + if (!sched_feat(ATTACH_AGE_LOAD)) + goto skip_aging; + /* * If we got migrated (either between CPUs or between cgroups) we'll * 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; cfs_rq->avg.load_avg += se->avg.load_avg; cfs_rq->avg.load_sum += se->avg.load_sum; diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 83a50e7ca533..e6fd23b7459b 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -73,6 +73,8 @@ SCHED_FEAT(FORCE_SD_OVERLAP, false) SCHED_FEAT(RT_RUNTIME_SHARE, true) SCHED_FEAT(LB_MIN, false) +SCHED_FEAT(ATTACH_AGE_LOAD, true) + /* * Apply the automatic NUMA scheduling policy. Enabled automatically * at runtime if running on a NUMA machine. Can be controlled via |