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

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Message-ID: <20141226135945.GA20929@krava.redhat.com>
Date:	Fri, 26 Dec 2014 14:59:45 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
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

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

jirka
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