linux-kernel - Re: [PATCH 0/8] perf: add ability to sample physical data addresses

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Date:	Tue, 30 Jul 2013 18:16:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 0/8] perf: add ability to sample physical data addresses

On Tue, Jul 30, 2013 at 06:09:15PM +0200, Stephane Eranian wrote:
> On Tue, Jul 30, 2013 at 5:52 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Tue, Jul 30, 2013 at 04:21:41PM +0200, Stephane Eranian wrote:
> >> Peter,
> >>
> >> One thing that bothers me with the MMAP2 approach is that
> >> it forces integration into perf.
> >
> > This is a good (TM) thing, yes? ;-)
> >
> 
> Well, that's one way to look at it. But I'd like the API to
> be able to support more than one tool easily. If the barrier
> for any advanced analysis is too high from the raw kernel
> API then we will only have one tool. I don't think that sane.

Sure, but any half-way usable profiling will need the existing sideband
data. So I don't think that relying on it for this particular feature is
too much.
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