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

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Message-ID: <20130730155212.GB32226@laptop.programming.kicks-ass.net>
Date:	Tue, 30 Jul 2013 17:52:12 +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 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? ;-)

> Now, you will need to analyze
> the MMAP2 records. With my sample_type approach, you
> simply needed a cmdline option on perf record, and then
> you could dump the sample using perf report -D and feed
> them into a post-processing script. But now, the analysis
> needs to be integrated into perf or the tool needs to parse
> the full perf.data file.

So the disadvantage of the sample_type approach is that it generates
more data and bloats the fast path.

If its useful it shouldn't live in a script anyway ;-) Also if the
script muck can't deal with the side-band information its a worse broken
piece of crap than I thought it was.
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