linux-kernel - Re: [PATCH 00/11] perf tool: Add PERF_SAMPLE

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Date:	Fri, 26 Oct 2012 10:00:34 -0700
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 00/11] perf tool: Add PERF_SAMPLE_READ sample read support

Em Sat, Oct 27, 2012 at 12:39:06AM +0900, Namhyung Kim escreveu:
> 2012-10-26 (금), 12:23 +0200, Jiri Olsa:
> >   $ ./perf record -e '{cycles,cache-misses}:S,instructions' ls
> >   $ ./perf record -e '{cycles:S,cache-misses},instructions' ls
> >   $ ./perf record -e 'cycles:S,instructions' ls
> >   - non matching sample_type
> > 
> > hm, thats the unique sample_type issue again ;) Once we set
> > PERF_SAMPLE_READ for event or group, we need to set it for
> > all other events in session, otherwise the report fails
> 
> Sorry, I don't understand why we need to set it for all events.  Just
> setting it for a group is not sufficient?  Please shed some light on
> this.

Artificial limitation on having multiple sample_type's on a single
perf.data?

My plan is to experiment with multiple evlists in 'trace' to get, say,
callchains on some events but not in the others.

- Arnaldo
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