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

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Date:	Tue, 19 Jun 2012 11:13:59 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Jim Cromie <jim.cromie@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	<stable@...r.kernel.org>, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf stat: Fix default logfd to use stderr

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

Thanks,
Namhyung
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