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

[Namhyung Kim <namhyung@kernel.org>]

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@gmail.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@redhat.com>
>> Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
>> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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