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Commit a9280514 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

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: default avatarPeter 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: default avatarIngo Molnar <mingo@kernel.org>
parent 6efdb105

kernel/sched/fair.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

kernel/sched/features.h

+2 −0
Original line number Diff line number Diff line
@@ -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