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

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH] sched: fix incorrect wait time and wait count statistics
Date 2015-10-25 11:10 +0100
Message-ID <qnqpr-1gk-1@gated-at.bofh.it> (permalink)
References <qnm2u-6ii-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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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Thread

[PATCH] sched: fix incorrect wait time and wait count statistics Joonwoo Park <joonwoop@codeaurora.org> - 2015-10-25 06:30 +0100
  Re: [PATCH] sched: fix incorrect wait time and wait count statistics Peter Zijlstra <peterz@infradead.org> - 2015-10-25 11:10 +0100
  Re: [PATCH] sched: fix incorrect wait time and wait count statistics Peter Zijlstra <peterz@infradead.org> - 2015-10-25 11:30 +0100
    Re: [PATCH] sched: fix incorrect wait time and wait count statistics Joonwoo Park <joonwoop@codeaurora.org> - 2015-10-27 02:50 +0100
      Re: [PATCH] sched: fix incorrect wait time and wait count statistics Peter Zijlstra <peterz@infradead.org> - 2015-10-28 01:20 +0100
        Re: [PATCH] sched: fix incorrect wait time and wait count statistics Joonwoo Park <joonwoop@codeaurora.org> - 2015-10-28 03:50 +0100
          [PATCH v4] sched: fix incorrect wait time and wait count statistics Joonwoo Park <joonwoop@codeaurora.org> - 2015-10-28 05:50 +0100
  [PATCH v3] sched: fix incorrect wait time and wait count statistics Joonwoo Park <joonwoop@codeaurora.org> - 2015-10-27 20:20 +0100

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