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

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Message-ID: <20160126141830.GC4361@kernel.org>
Date:	Tue, 26 Jan 2016 11:18:30 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...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

Em Tue, Jan 26, 2016 at 09:08:22AM +0100, Ingo Molnar escreveu:
> 
> * 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?

Ok, doing that...

- Arnaldo