This is a note to let you know that I've just added the patch titled
sched/fair: Removed useless update of p->recent_used_cpu
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sched-fair-removed-useless-update-of-p-recent_used_c.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 552c62e65a61a2e32463c17af4c303dfd669b560
Author: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Date: Tue Sep 28 12:35:44 2021 +0200
sched/fair: Removed useless update of p->recent_used_cpu
[ Upstream commit a7ba894821b6ade7bb420455f87020b2838d6180 ]
Since commit 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu"),
p->recent_used_cpu is unconditionnaly set with prev.
Fixes: 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu")
Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxx>
Link: https://lkml.kernel.org/r/20210928103544.27489-1-vincent.guittot@xxxxxxxxxx
Stable-dep-of: a2e7f03ed28f ("sched/uclamp: Make asym_fits_capacity() use util_fits_cpu()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9e2c6e38342c..d706c1a8453a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6595,11 +6595,6 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
(available_idle_cpu(recent_used_cpu) || sched_idle_cpu(recent_used_cpu)) &&
cpumask_test_cpu(p->recent_used_cpu, p->cpus_ptr) &&
asym_fits_capacity(task_util, recent_used_cpu)) {
- /*
- * Replace recent_used_cpu with prev as it is a potential
- * candidate for the next wake:
- */
- p->recent_used_cpu = prev;
return recent_used_cpu;
}
