Commit-ID: a9280514bf1e54775b8d7cd93d87c05c2b5273e6
Gitweb: http://git.kernel.org/tip/a9280514bf1e54775b8d7cd93d87c05c2b5273e6
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Fri, 11 Sep 2015 16:10:59 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Sun, 13 Sep 2015 09:52:48 +0200
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@xxxxxxxxxxxxx>
Cc: Byungchul Park <byungchul.park@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: yuyang.du@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/fair.c | 4 ++++
kernel/sched/features.h | 2 ++
2 files changed, 6 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5143ea0..5cd7054 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 83a50e7..e6fd23b 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
--
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