From: David Ahern <dsahern@gmail.com>
To: Luigi Semenzato <semenzato@chromium.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Andrew Morton <akpm@linux-foundation.org>,
Vasiliy Kulikov <segoon@openwall.com>,
Stephen Wilson <wilsons@start.ca>,
Oleg Nesterov <oleg@redhat.com>, Tejun Heo <tj@kernel.org>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Andi Kleen <ak@linux.intel.com>,
Lucas De Marchi <lucas.demarchi@profusion.mobi>,
Greg Kroah-Hartman <gregkh@suse.de>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Frederic Weisbecker <fweisbec@gmail.com>,
Namhyung Kim <namhyung@gmail.com>,
Robert Richter <robert.richter@amd.com>,
linux-kernel@vger.kernel.org, sonnyrao@chromium.org,
olofj@chromium.org, eranian@google.com
Subject: Re: [PATCH] Perf: bug fix: distinguish between rename and exec
Date: Wed, 15 Feb 2012 10:30:07 -0700 [thread overview]
Message-ID: <4F3BEB9F.2090502@gmail.com> (raw)
In-Reply-To: <CAA25o9QLbUiTWr6moqYxVkcvKrOCGO9qWyN6HVzo_RWXhqUq+Q@mail.gmail.com>
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.
next prev parent reply other threads:[~2012-02-15 17:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-14 4:56 [PATCH] Perf: bug fix: distinguish between rename and exec Luigi Semenzato
2012-02-15 12:48 ` Peter Zijlstra
2012-02-15 13:47 ` Arnaldo Carvalho de Melo
2012-02-15 17:07 ` Luigi Semenzato
2012-02-15 17:47 ` Arnaldo Carvalho de Melo
2012-03-02 13:44 ` Stephane Eranian
2012-03-02 14:47 ` Arnaldo Carvalho de Melo
2012-03-02 15:25 ` Stephane Eranian
2012-02-15 16:57 ` David Ahern
2012-02-15 17:22 ` Luigi Semenzato
2012-02-15 17:30 ` David Ahern [this message]
2012-02-15 17:30 ` Peter Zijlstra
2012-02-15 18:55 ` David Ahern
[not found] ` <CABPqkBTJHOsSfMBMW17reBObLW0bphWZo4AjVh_hTkv5tBHtDA@mail.gmail.com>
2012-02-15 18:07 ` Arnaldo Carvalho de Melo
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