linux-kernel - Re: [PATCH] sched: fix incorrect wait time and wait count statistics

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Message-ID: <20151025100850.GO2508@worktop.programming.kicks-ass.net>
Date:	Sun, 25 Oct 2015 11:08:50 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Joonwoo Park <joonwoop@...eaurora.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] sched: fix incorrect wait time and wait count statistics

On Sat, Oct 24, 2015 at 10:23:14PM -0700, Joonwoo Park wrote:
> At present scheduler resets task's wait start timestamp when the task
> migrates to another rq.  This misleads scheduler itself into reporting
> less wait time than actual by omitting time spent for waiting prior to
> migration and also more wait count than actual by counting migration as
> wait end event which can be seen by trace or /proc/<pid>/sched with
> CONFIG_SCHEDSTATS=y.
> 

Have you seen:

  1de64443d755 ("sched/core: Fix task and run queue sched_info::run_delay inconsistencies")

?
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