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

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Message-ID: <87txti81i2.fsf@sejong.aot.lge.com>
Date:	Fri, 26 Oct 2012 10:29:09 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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

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}'.

Thanks,
Namhyung
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