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 07:44:37 -0700
From:	David Ahern <dsahern@...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>,
	Frederic Weisbecker <fweisbec@...il.com>,
	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 11/11/13, 5:19 AM, Ingo Molnar wrote:
>
> In what way is call-graph profiling utilized typically?
>
> Is it system-wide, i.e. something like:
>
> 	perf record -a -g sleep 10
>
> ? If yes then that would explain why scalability problems rarely surfaced,
> it takes a longer user-space profile to get to the event counts where
> scalability started hurting.

Both. But not time periods long enough to generate GB sized files 
(limitations in the product). I get various reports of hung commands 
(usually perf-not terminated properly (now fixed) or the file is 
corrupted on transfer), but noone has complained to me about perf-report 
appearing to hang or for 20-30 minutes to generate a result.

David
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