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

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Message-ID: <1351268730.1619.21.camel@leonhard>
Date:	Sat, 27 Oct 2012 01:25:30 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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

2012-10-26 (금), 10:14 -0600, David Ahern:
> On 10/26/12 9:39 AM, Namhyung Kim wrote:
> >> 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.
> 
> perf does not support multiple sample_types -- all events in the session 
> need to use the same one.

Can I ask why? :)

Thanks,
Namhyung


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