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Subject[PATCH] sched/fair: fix runnable_avg for throttled cfs
Date
When a cfs_rq is throttled, its group entity is dequeued and its running
tasks are removed. We must update runnable_avg with current h_nr_running
and update group_se->runnable_weight with new h_nr_running at each level
of the hierarchy.

Fixes: 9f68395333ad ("sched/pelt: Add a new runnable average signal")
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
This patch applies on top of tip/sched/core

kernel/sched/fair.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index fcc968669aea..6d46974e9be7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4703,6 +4703,11 @@ static void throttle_cfs_rq(struct cfs_rq *cfs_rq)

if (dequeue)
dequeue_entity(qcfs_rq, se, DEQUEUE_SLEEP);
+ else {
+ update_load_avg(qcfs_rq, se, 0);
+ se_update_runnable(se);
+ }
+
qcfs_rq->h_nr_running -= task_delta;
qcfs_rq->idle_h_nr_running -= idle_task_delta;

@@ -4772,6 +4777,11 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
cfs_rq = cfs_rq_of(se);
if (enqueue)
enqueue_entity(cfs_rq, se, ENQUEUE_WAKEUP);
+ else {
+ update_load_avg(cfs_rq, se, 0);
+ se_update_runnable(se);
+ }
+
cfs_rq->h_nr_running += task_delta;
cfs_rq->idle_h_nr_running += idle_task_delta;

--
2.17.1
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