linux-kernel - Re: [PATCH] perf: fix symbol processing bug and greatly improve performance

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Date:	Tue, 07 May 2013 10:52:28 -0400
From:	Waiman Long <Waiman.Long@...com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] perf: fix symbol processing bug and greatly improve performance

On 05/07/2013 10:19 AM, Waiman Long wrote:
> The slowdown that I was trying to fix was in the "perf record" part of 
> the profiling process, not the "perf report" part. I didn't try 
> perf-record on perf-record as the performance counters are limited 
> resources and I don't want resource conflicts to affect the results. 
> As the slow-down was entirely in the user space, I decided to use 
> gprof to do the profiling.

Just to clarify that the post-processing time that I referred to in the 
patch is the time spent after the workload finishes in the perf-record 
session and the perf command itself quits. I could take a really long 
time for perf to quit without the patch.

Regards,
Longman

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