linux-kernel - Re: [PATCH 37/37] perf data: Implement 'split' subcommand

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Date:	Sat, 27 Dec 2014 14:21:12 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 37/37] perf data: Implement 'split' subcommand

Hi Jiri,

On Fri, Dec 26, 2014 at 10:59 PM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Wed, Dec 24, 2014 at 04:15:33PM +0900, Namhyung Kim wrote:
>> The perf data split command is for splitting a (large) single data
>> file into multiple files under a directory (perf.data.dir by default)
>> so that it can be processed and reported using multiple threads.
>>
>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>> ---
>>  tools/perf/Documentation/perf-data.txt |  28 +++++
>>  tools/perf/builtin-data.c              | 223 +++++++++++++++++++++++++++++++++
>>  2 files changed, 251 insertions(+)
>>
>> diff --git a/tools/perf/Documentation/perf-data.txt b/tools/perf/Documentation/perf-data.txt
>> index b8c83947715c..42708702f10c 100644
>> --- a/tools/perf/Documentation/perf-data.txt
>> +++ b/tools/perf/Documentation/perf-data.txt
>> @@ -13,3 +13,31 @@ SYNOPSIS
>>  DESCRIPTION
>>  -----------
>>  Data file related processing.
>> +
>> +COMMANDS
>> +--------
>> +split::
>> +     Split single data file (perf.data) into multiple files under a directory
>> +     in order to be reported by multiple threads.
>> +
>> +OPTIONS for 'split'
>> +---------------------
>> +-i::
>> +--input::
>> +     Specify input perf data file path.
>> +
>> +-o::
>> +--output::
>> +     Specify output perf data directory path.
>
> should the -o have 'perf.data.dir' as default?
>
> [jolsa@...va perf]$ ./perf record ls > /dev/null
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.000 MB perf.data (~0 samples) ]
> [jolsa@...va perf]$ ./perf data split
> [jolsa@...va perf]$ ll perf.data*
> -rw------- 1 jolsa jolsa 16172 Dec 26 14:58 perf.data

You're right! :)

Thanks,
Namhyung
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