From: Vincent Guittot <vincent.guittot@linaro.org>
To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de, bristot@redhat.com,
linux-kernel@vger.kernel.org, odin@uged.al,
cgroups@vger.kernel.org
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH 0/2] schd/fair: fix stalled cfs_rq->tg_load_avg_contrib
Date: Thu, 27 May 2021 14:29:14 +0200 [thread overview]
Message-ID: <20210527122916.27683-1-vincent.guittot@linaro.org> (raw)
Odin reported some fairness problem between cgroup because of stalled
value in cfs_rq->tg_load_avg_contrib:
https://lkml.org/lkml/2021/5/18/566
2 problems generated this situation:
-1st: After propagating load in the hierarchy, load_sum can be null
whereas load_avg isn't so the cfs_rq is removed whereas it still
contribute to th tg's load
-2nd: cfs_rq->tg_load_avg_contrib was not always updated after
significant changes like becoming null because cfs_rq had already
been updated when propagating a child load.
Vincent Guittot (2):
sched/fair: keep load_avg and load_sum synced
sched/fair: make sure to update tg contrib for blocked load
kernel/sched/fair.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--
2.17.1
next reply other threads:[~2021-05-27 12:29 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-27 12:29 Vincent Guittot [this message]
2021-05-27 12:29 ` [PATCH 1/2] sched/fair: keep load_avg and load_sum synced Vincent Guittot
2021-05-27 13:05 ` Peter Zijlstra
2021-05-27 13:18 ` Vincent Guittot
2021-05-27 13:37 ` Peter Zijlstra
2021-05-27 13:40 ` kernel test robot
2021-05-31 10:40 ` [tip: sched/urgent] sched/fair: Keep " tip-bot2 for Vincent Guittot
2021-05-27 12:29 ` [PATCH 2/2] sched/fair: make sure to update tg contrib for blocked load Vincent Guittot
2021-05-31 10:40 ` [tip: sched/urgent] sched/fair: Make " tip-bot2 for Vincent Guittot
2021-05-27 14:19 ` [PATCH 0/2] schd/fair: fix stalled cfs_rq->tg_load_avg_contrib Vincent Guittot
2021-05-27 14:24 ` Odin Ugedal
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