linux-kernel - Re: [PATCH 15/19] perf tools: Add document for perf-ftrace command

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Message-ID: <87y59dwluq.fsf@sejong.aot.lge.com>
Date:	Thu, 11 Jul 2013 17:18:37 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 15/19] perf tools: Add document for perf-ftrace command

On Wed, 10 Jul 2013 16:22:19 +0200, Jiri Olsa wrote:
> On Wed, Jun 26, 2013 at 04:14:18PM +0900, Namhyung Kim wrote:
>> From: Namhyung Kim <namhyung.kim@....com>
>> 
>> Cc: Steven Rostedt <rostedt@...dmis.org>
>> Cc: Frederic Weisbecker <fweisbec@...il.com>
>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>> ---
>
> SNIP
>
>> +OPTIONS
>> +-------
>> +<command>...::
>> +	Any command you can specify in a shell.
>> +
>> +-t::
>> +--tracer=::
>> +        The ftrace tracer to be used (default: function_graph).
>> +	Currently only 'function' and 'function_graph' are supported.
>> +        Used by 'live' and 'record' subcommands only.
>
> hum, 'live' subcommand  supports whatever is available in
> 'available_tracers' file, right?
>
> and displays whatever gets into 'trace' .. which I think
> is useful and should stay like that

Agreed.  How about this?

	The ftrace tracer to be used (default: function_graph).
	Currently, only 'function' and 'function_graph' are
	supported by 'record' command. 'live' command accepts
	any available tracer in system and outputs trace result
	directly from the ftrace's trace_pipe.


Thanks,
Namhyung
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