linux-kernel - Re: [RFC/PATCHSET 00/14] perf report: Add support to accumulate hist periods (v2)

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Date:	Mon, 11 Nov 2013 14:08:45 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Pekka Enberg <penberg@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Rodrigo Campos <rodrigo@...g.com.ar>,
	Arun Sharma <asharma@...com>
Subject: Re: [RFC/PATCHSET 00/14] perf report: Add support to accumulate hist
 periods (v2)

On Mon, Nov 11, 2013 at 01:13:52PM +0100, Ingo Molnar wrote:
> 
> It's not an irrelevant feature at all! :-)
> 
> It's just that for any sort of longer profile it was pretty 
> difficult/frustrating to use, which I think held back adoption.
> 
> That performance problem got fixed now by you and Namhyung, so I think 
> we'll see even wider adoption of call-graph profiling...

Ah I see now. At the time Linus reported his issue, I had the feeling his
usecase was a bit "extreme", but I actually have no idea how far perf can be
used given that I'm mostly used to short benchmarks, typically hackbench,
perf bench sched messaging et al. Thing is I don't use it enough for my
real usecases :)
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