sched/fair: Fix typo in sync_throttle()

We should update cfs_rq->throttled_clock_task, not
pcfs_rq->throttle_clock_task.

The effects of this bug was probably occasionally erratic
group scheduling, particularly in cgroups-intense workloads.

Signed-off-by: Xunlei Pang <xlpang@redhat.com>
[ Added changelog. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 55e16d30bd99 ("sched/fair: Rework throttle_count sync")
Link: http://lkml.kernel.org/r/1468050862-18864-1-git-send-email-xlpang@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
(cherry picked from commit b8922125e4790fa237a8a4204562ecf457ef54bb)

Orabug: 27787518

Signed-off-by: Gayatri Vasudevan <gayatri.vasudevan@oracle.com>
Reviewed-by: Mridula Shastry <mridula.c.shastry@oracle.com>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1f9655822aec3b215fc18f4bc684acdef8e00c4f..05f38e104dacd44e0926d180f9a1ac0c78207371 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3860,7 +3860,7 @@ static void sync_throttle(struct task_group *tg, int cpu)
        pcfs_rq = tg->parent->cfs_rq[cpu];
 
        cfs_rq->throttle_count = pcfs_rq->throttle_count;
-       pcfs_rq->throttled_clock_task = rq_clock_task(cpu_rq(cpu));
+       cfs_rq->throttled_clock_task = rq_clock_task(cpu_rq(cpu));
 }
 
 /* conditionally throttle active cfs_rq's from put_prev_entity() */