Messages in this thread Patch in this message | | | Date | Wed, 19 Oct 2016 17:52:19 +0200 | From | Ingo Molnar <> | Subject | [GIT PULL] scheduler fix |
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Linus,
Please pull the latest sched-urgent-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-for-linus
# HEAD: b5a9b340789b2b24c6896bcf7a065c31a4db671c sched/fair: Fix incorrect task group ->load_avg
This fixes a group scheduling related performance/interactivity regression introduced in v4.8, which affects certain hardware environments where cpu_possible_mask != cpu_present_mask.
Thanks,
Ingo
------------------> Vincent Guittot (1): sched/fair: Fix incorrect task group ->load_avg
kernel/sched/fair.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 76ee7de1859d..d941c97dfbc3 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -690,7 +690,14 @@ void init_entity_runnable_average(struct sched_entity *se) * will definitely be update (after enqueue). */ sa->period_contrib = 1023; - sa->load_avg = scale_load_down(se->load.weight); + /* + * Tasks are intialized with full load to be seen as heavy tasks until + * they get a chance to stabilize to their real load level. + * Group entities are intialized with zero load to reflect the fact that + * nothing has been attached to the task group yet. + */ + if (entity_is_task(se)) + sa->load_avg = scale_load_down(se->load.weight); sa->load_sum = sa->load_avg * LOAD_AVG_MAX; /* * At this point, util_avg won't be used in select_task_rq_fair anyway
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