linux-kernel - Re: [PATCH 05/33] perf record: Allow the user to disable time stamps

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Message-ID: <20140813050812.GA19464@gmail.com>
Date:	Wed, 13 Aug 2014 07:08:12 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 05/33] perf record: Allow the user to disable time stamps


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

> Em Tue, Aug 12, 2014 at 04:58:19PM +0200, Ingo Molnar escreveu:
> > * Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> > > Em Tue, Aug 05, 2014 at 08:08:56AM +0200, Ingo Molnar escreveu:
> > > > This patch looks dangerous and misleading to me.
> 
> > > I took it more from the angle: hey, it fixes a regression, i.e. 
> > > -T/--time somehow became a noop, and also it doesn't change any 
> > > default.
> 
> > > It also states that you will get misaccounting, why that would 
> > > happen, althought wording could've been better, as mmaps won't be 
> > > "missing", i.e. they will be there as this governs just 
> > > PERF_SAMPLE_TIME, not perf_event_attr.mmap, so it MMAPs may come 
> > > after samples for its maps.
> 
> > > So, I took it.
> 
> > > How should we proceed?
> 
> > I'd be fine with applying the patch and fixing the misleading 
> > changelog.
> 
> Done:
> 
> https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/core&id=8affc2b8c27bfc2d6e70827b746f490b62c44eaa
> 
> Consider now pulling the perf-core-for-mingo tag there, I updated it
> after updating the changelog for this specific commit, all the
> rest is the same as in the previous pull req.

Pulled into tip:perf/core, thanks a lot Arnaldo!

	Ingo
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