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

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Message-ID: <20140812152953.GA9820@kernel.org>
Date:	Tue, 12 Aug 2014 12:29:53 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...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

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.

Thanks,

- Arnaldo
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