linux-kernel - Re: [PATCH] perf stat: Fix default logfd to use stderr

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Date:	Tue, 19 Jun 2012 08:09:31 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Robert Richter <robert.richter@....com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jim Cromie <jim.cromie@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH] perf stat: Fix default logfd to use stderr

On Tue, Jun 19, 2012 at 4:13 AM, Namhyung Kim <namhyung@...nel.org> wrote:
> Hi, Robert
>
> On Mon, 18 Jun 2012 16:51:08 +0200, Robert Richter wrote:
>> On 29.09.11 18:48:01, Arnaldo Carvalho de Melo wrote:
>>> From: Jim Cromie <jim.cromie@...il.com>
>>>
>>> This perf stat option emulates valgrind's --log-fd option, allowing the
>>> user to send perf results elsewhere, and leaving stderr for use by the
>>> program under test.  This complements --output file option, and is
>>> mutually exclusive with it.
>>>
>>>    3>results  perf stat --log-fd 3          -- $cmd
>>>    3>>results perf stat --log-fd 3 --append -- $cmd
>>>
>>> The perl distro's make test.valgrind target uses valgrind's --log-fd
>>> option, I've adapted it to invoke perf also, and tested this patch
>>> there.
>>>
>>> Link: http://lkml.kernel.org/r/1315437244-3788-2-git-send-email-jim.cromie@gmail.com
>>> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>>> Signed-off-by: Jim Cromie <jim.cromie@...il.com>
>>> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>>
>> With certain shell redirections this (56f3bae) fails with a log fd
>> setup failure. Fix below.
>>
>
> It looks somewhat related to Stephane's patch. Can you we check it too?
>
> http://lkml.indiana.edu/hypermail/linux/kernel/1205.1/04232.html
>
Yes, my patch is needed and it was posted over a month ago now.....
Arnaldo, please apply my patch.

> Thanks,
> Namhyung
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