lkml.org 
[lkml]   [2013]   [Jun]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 05/19] perf tools: Introduce new 'ftrace' tool
From
Date
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-06-27 21:21    [W:0.071 / U:1.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site