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

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Message-ID: <20160126080822.GA7970@gmail.com>
Date:	Tue, 26 Jan 2016 09:08:22 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: 'perf stat --repeat N' oddity/regression


* Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> 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.

Hm, are all of those changes fixes? If not then mind splitting them into a 
perf/urgent portion as well?

Thanks!

	Ingo