linux-kernel - Re: [PATCH 2/2] perf sched timehist: Fix invalid runtime in the idle hist

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Date:   Tue, 13 Dec 2016 10:12:11 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <andi@...stfloor.org>,
        Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH 2/2] perf sched timehist: Fix invalid runtime in the idle
 hist

Em Tue, Dec 13, 2016 at 07:54:42PM +0900, Namhyung Kim escreveu:
> On Tue, Dec 13, 2016 at 07:32:36AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Dec 13, 2016 at 05:06:32PM +0900, Namhyung Kim escreveu:
> > > When --idle-hist option is used, run/wait time and sched delay value
> > > should be shown for idle task only.  But due to internal accounting, a
> > > last thread has same value of next idle task's and it was shown.
> > > 
> > > In the below example, firefox after idle task has same run time of
> > > idle task's.
> > 
> > Same as last message, is this something I can fold into a patch yet in
> > my perf/core branch?
> 
> Yep,
> 
> Fixes: 78de3657008b ("perf sched timehist: Add -I/--idle-hist option")
> 
> I guess it makes a conflict on the callchain code.  In case it doesn't
> look obvious to resolve, please let me know..

Ok, fixed up, after building it, before 'rebase --continue', we get:

           time    cpu  task name             wait time  sch delay   run time
                        [tid/pid]                (msec)     (msec)     (msec)
--------------- ------  --------------------  ---------  ---------  ---------
   47548.582141 [0000]  perf[17869]               0.000      0.000      0.000 
   47548.583814 [0003]  rcu_sched[7]              0.000      0.000      0.000 
   47548.583825 [0003]  <idle>                    0.005      0.000      0.010 
   47548.583826 [0002]  rcuos/0[9]                0.000      0.000      0.000 
   47548.583828 [0003]  rcu_sched[7]              0.000      0.000      0.000 
   47548.587797 [0003]  <idle>                    0.002      0.000      3.969 
   47548.587799 [0003]  rcu_sched[7]              0.000      0.000      0.000 
   47548.587799 [0002]  <idle>                    0.011      0.000      3.973 
   47548.587808 [0002]  rcuos/0[9]                0.000      0.000      0.000 
   47548.594979 [0002]  <idle>                    0.008      0.000      7.171 
   47548.595014 [0002]  Timer[4869/4832]          0.000      0.000      0.000 
   47548.595064 [0001]  firefox[4832]             0.000      0.000      0.000 
   47548.603831 [0002]  <idle>                    0.034      0.000      8.817 
   47548.603874 [0001]  <idle>                    0.054      0.000      8.809

Which matches what you state as being the fix (task runtime after idle task).

git rebase --continue next...

- Arnaldo