linux-kernel - Re: [PATCH 00/11] perf tool: Add PERF_SAMPLE

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Message-ID: <87obfyrqap.fsf@sejong.aot.lge.com>
Date:	Wed, 06 Feb 2013 13:59:10 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 00/11] perf tool: Add PERF_SAMPLE_READ sample read support

On Mon,  4 Feb 2013 13:32:54 +0100, Jiri Olsa wrote:
> hi,
> adding support to read sample values through the PERF_SAMPLE_READ
> sample type. It's now possible to specify 'S' modifier for an event
> and get its sample value by PERF_SAMPLE_READ.
>
> For group the 'S' modifier will enable sampling only for the leader
> and read all the group member by PERF_SAMPLE_READ smple type with
> PERF_FORMAT_GROUP read format.
>
> This was first introduced in here:
> https://lkml.org/lkml/2012/10/20/75
>
> Example:
>
>   $ perf record -e '{cycles,cache-misses}:S' ls
>   ...
>   $ perf report --group --show-total-period --stdio
>   ...
>   # Samples: 36  of event 'anon group { cycles, cache-misses }'
>   # Event count (approx.): 12585593
>   #
>   #         Overhead                    Period  Command      Shared Object                      Symbol
>   # ................  ........................  .......  .................  ..........................
>   #
>       19.92%   1.20%       2505936          31       ls  [kernel.kallsyms]  [k] mark_held_locks
>       13.74%   0.47%       1729327          12       ls  [kernel.kallsyms]  [k] sched_clock_local
>       13.64%  23.72%       1716147         612       ls  ld-2.14.90.so      [.] check_match.10805
>       13.12%  23.22%       1650778         599       ls  libc-2.14.90.so    [.] _nl_intern_locale_data
>       11.24%  29.19%       1414554         753       ls  [kernel.kallsyms]  [k] sched_clock_cpu
>        8.50%   0.35%       1070150           9       ls  [kernel.kallsyms]  [k] check_chain_key
>   ...
>
>
> The patchset is based on following fix:
> http://lkml.org/lkml/2013/2/4/122
>
> and is available also at:
> git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/linux.git
> perf/group6

For the whole series:

  Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung
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