linux-kernel - Re: [PATCH 1/1] Sched/fair: Improve the accuracy of sched_stat

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Message-ID: <20201015110239.GD2611@hirez.programming.kicks-ass.net>
Date:   Thu, 15 Oct 2020 13:02:39 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     qianjun.kernel@...il.com
Cc:     mingo@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH 1/1] Sched/fair: Improve the accuracy of sched_stat_wait
 statistics

On Thu, Oct 15, 2020 at 02:48:46PM +0800, qianjun.kernel@...il.com wrote:
> From: jun qian <qianjun.kernel@...il.com>
> 
> 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@...il.com>
> Reviewed-by: Yafang Shao <laoar.shao@...il.com>

Thanks!