Re: 'perf stat --repeat N' oddity/regression

From	Arnaldo Carvalho de Melo <acme@kernel.org>
Newsgroups	linux.kernel
Subject	Re: 'perf stat --repeat N' oddity/regression
Date	2016-01-25 20:50 +0100
Message-ID	<qUVjd-pt-15@gated-at.bofh.it> (permalink)
References	(2 earlier) <qQ8h3-2fU-5@gated-at.bofh.it> <qQra2-6Tj-19@gated-at.bofh.it> <qUU3N-830-33@gated-at.bofh.it> <qUUdu-88K-59@gated-at.bofh.it> <qUVjd-pt-17@gated-at.bofh.it>
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Em Mon, Jan 25, 2016 at 04:43:33PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu:
> > 
> > So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 install 
> > displays:
> > 
> >     16,244,802,268      instructions               ( +- 23.01% )
> > 
> >        2.108676769 seconds time elapsed                                          ( +-  0.86% )
> > 
> > 
> > [a few minutes later]
> > 
> > Bisected it down to:
> 
> Mel Gorman reported this and Jiri provided a patch that Mel tested and
> verified that it fixed, checking where it is sitting now...

I already sent it your way, its:

    198 N C 01/21 Arnaldo Carvalh (1.4K) ├─>[PATCH 06/16] perf stat: Do not clean event's private stats

Please pull my perf-core-for-mingo tag and you should get it, its an one
liner.

- Arnaldo
 
> - Arnaldo
>  
> >  106a94a0f8c207ef4113ce7e32f34a00b3b174e7 is the first bad commit
> >  commit 106a94a0f8c207ef4113ce7e32f34a00b3b174e7
> >  Author: Jiri Olsa <jolsa@kernel.org>
> >  Date:   Fri Jun 26 11:29:19 2015 +0200
> > 
> >      perf stat: Introduce read_counters function
> > 
> > So this look like to be a regression.
> > 
> > Thanks,
> > 
> > 	Ingo

Thread

'perf stat --repeat N' oddity/regression Ingo Molnar <mingo@kernel.org> - 2016-01-25 19:30 +0100
  Re: 'perf stat --repeat N' oddity/regression Ingo Molnar <mingo@kernel.org> - 2016-01-25 19:40 +0100
    Re: 'perf stat --repeat N' oddity/regression Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-25 20:50 +0100
      Re: 'perf stat --repeat N' oddity/regression Ingo Molnar <mingo@kernel.org> - 2016-01-26 09:10 +0100
        Re: 'perf stat --repeat N' oddity/regression Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-26 15:20 +0100
    Re: 'perf stat --repeat N' oddity/regression Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-25 20:50 +0100

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