sched/pelt: Ensure that *_sum is always synced with *_avg

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[ Upstream commit fcf6631f37 ]

Rounding in PELT calculation happening when entities are attached/detached
of a cfs_rq can result into situations where util/runnable_avg is not null
but util/runnable_sum is. This is normally not possible so we need to
ensure that util/runnable_sum stays synced with util/runnable_avg.

detach_entity_load_avg() is the last place where we don't sync
util/runnable_sum with util/runnbale_avg when moving some sched_entities

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210601085832.12626-1-vincent.guittot@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Vincent Guittot 2021-06-01 10:58:32 +02:00 • committed by Greg Kroah-Hartman

parent f6d28f0e36

commit 813ff24f1d

1 changed files with 8 additions and 2 deletions

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kernel/sched/fair.c

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