From: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
commit 289de35984815576793f579ec27248609e75976e upstream.
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: 57abff067a08 ("sched/fair: Rework find_idlest_group()")
Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200218144534.4564-1-vincent.guittot@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/fair.c | 2 ++
1 file changed, 2 insertions(+)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8315,6 +8315,8 @@ static inline void update_sg_wakeup_stat
sgs->group_capacity = group->sgc->capacity;
+ sgs->group_weight = group->group_weight;
+
sgs->group_type = group_classify(sd->imbalance_pct, group, sgs);
/*
