linux-kernel - Re: [PATCH 05/19] perf tools: Introduce new 'ftrace' tool

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Date:	Thu, 27 Jun 2013 23:22:50 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	David Ahern <dsahern@...il.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>,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 05/19] perf tools: Introduce new 'ftrace' tool

2013-06-27 (목), 07:51 -0600, David Ahern:
> On 6/26/13 11:04 PM, Namhyung Kim wrote:
> > Hi David,
> >
> > On Wed, 26 Jun 2013 11:10:34 -0600, David Ahern wrote:
> >> On 6/26/13 1:14 AM, Namhyung Kim wrote:
> >>> +	const char * const ftrace_usage[] = {
> >>> +		"perf ftrace [<options>] [<command>]",
> >>> +		"perf ftrace [<options>] -- <command> [<options>]",
> >>> +		NULL
> >>> +	};
> >>> +	const struct option ftrace_options[] = {
> >>> +	OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
> >>> +		   "tracer to use"),
> >>
> >> How does a user know what is a valid tracer string?
> >
> > The helpline should look like (at least):
> >
> >    "tracer to use: function_graph or function"
> 
> exactly. I would suggest making that OPT_CALLBACK as well to validate 
> the string content when options are parsed.

Did you mean it by checking /sys/kernel/debug/tracing/available_tracers?

Yes, I can do that.  But current code does not support other tracers and
it'd anyway emit warning on an invalid tracer argument.

Thanks,
Namhyung

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