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sched/fair: Fix statistics for find_idlest_group() 

sgs->group_weight is not set while gathering statistics in
update_sg_wakeup_stats(). This means that a group can be classified as
fully busy with 0 running tasks if utilization is high enough.

This path is mainly used for fork and exec.

Fixes: 57abff067a ("sched/fair: Rework find_idlest_group()")
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Link: https://lore.kernel.org/r/20200218144534.4564-1-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2020-02-18 15:45:34 +01:00 committed by Ingo Molnar
parent c5f8689118
commit 289de35984
1 changed files with 2 additions and 0 deletions
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kernel/sched/fair.c
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@ -8337,6 +8337,8 @@ static inline void update_sg_wakeup_stats(struct sched_domain *sd,
sgs->group_capacity = group->sgc->capacity;
sgs->group_weight = group->group_weight;
sgs->group_type = group_classify(sd->imbalance_pct, group, sgs);
/*