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-17@gated-at.bofh.it> (permalink)
References	(1 earlier) <qQ5jc-cc-27@gated-at.bofh.it> <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>
Organization	linux.* mail to news gateway

Show all headers | View raw

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...

- 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

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

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

csiph-web