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

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Message-ID: <1351242885.16863.0.camel@twins>
Date:	Fri, 26 Oct 2012 11:14:45 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	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

On Fri, 2012-10-26 at 10:29 +0900, Namhyung Kim wrote:
> Hi Jiri,
> 
> On Sat, 20 Oct 2012 16:33:08 +0200, Jiri Olsa wrote:
> > hi,
> > adding support to read sample values through the PERF_SAMPLE_READ
> > sample type. It's now possible to specify 'S' modifier for an event
> > and get its sample value by PERF_SAMPLE_READ.
> 
> I have a question.  What's an actual impact of specifying 'S' modifiere
> to a non-group event or even only a (non-leader) member of a group?  For
> instance, 'cycles:S' or '{branches,branch-misses:S}'.

I would hope a syntax error from the parser ;-)

I haven't actually looked at the implementation, but I understood it to
be a group modifier, not an event modifier.
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