linux-kernel - Re: [PATCH] Perf: bug fix: distinguish between rename and exec

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Message-ID: <4F3BEB9F.2090502@gmail.com>
Date:	Wed, 15 Feb 2012 10:30:07 -0700
From:	David Ahern <dsahern@...il.com>
To:	Luigi Semenzato <semenzato@...omium.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Stephen Wilson <wilsons@...rt.ca>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Robert Richter <robert.richter@....com>,
	linux-kernel@...r.kernel.org, sonnyrao@...omium.org,
	olofj@...omium.org, eranian@...gle.com
Subject: Re: [PATCH] Perf: bug fix: distinguish between rename and exec

On 2/15/12 10:22 AM, Luigi Semenzato wrote:
>
> Any process that makes a prctl(PR_SET_NAME) call loses its mappings,
> no matter when makes the call.  The perf records for that process look
> like this:
>
> COMM (for the initial exec)
> MMAP (the executable)
> MMAP (1st dll)
> MMAP (2nd dll)
> ...
> COMM (for the prctl)
>
> The second COMM flushes the old mappings, and all samples from then on
> cannot be classified.  This is easily reproducible with a small
> program, which I would be happy to send.

Ok, I see that now.

Thanks,
David

>
> I found this while trying to use perf with Chrome on Chrome OS.
> Chrome forks and execs all the time, and calls prctl() in the thread
> library.

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