sched/fair: Improve the accuracy of sched_stat_wait statistics

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When the sched_schedstat changes from 0 to 1, some sched se maybe
already in the runqueue, the se->statistics.wait_start will be 0.
So it will let the (rq_of(cfs_rq)) - se->statistics.wait_start)
wrong. We need to avoid this scenario.

Signed-off-by: jun qian <qianjun.kernel@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lkml.kernel.org/r/20201015064846.19809-1-qianjun.kernel@gmail.com

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jun qian 2020-10-15 14:48:46 +08:00 • committed by Peter Zijlstra

parent 23859ae444

commit b9c88f7522

1 changed files with 9 additions and 0 deletions

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kernel/sched/fair.c

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