linux-kernel - Re: [PATCH 01/17] perf util: Save pid-cmdline mapping into tracing header

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Message-ID: <20130730132839.GA2607@ghostprotocols.net>
Date:	Tue, 30 Jul 2013 10:28:39 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Jeremy Eder <jeder@...hat.com>
Subject: Re: [PATCH 01/17] perf util: Save pid-cmdline mapping into tracing
 header

Em Tue, Jul 30, 2013 at 06:18:58PM +0900, Namhyung Kim escreveu:
> From: Namhyung Kim <namhyung.kim@....com>
> 
> Current trace info data lacks the saved cmdline mapping which is
> needed for pevent to find out the comm of a task.  Add this and bump
> up the version number so that perf can determine its presence when
> reading.

Can't we get this from the PERF_RECORD_COMM synthesized at the beginning
of the session + the kernel generated ones for new threads?

We would just call machine__find_thread() and use thread->comm, etc, no?

- Arnaldo
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