linux-kernel - Re: [PATCH 1/5] ftrace perf: Check sample types only for sampling events

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Date:	Fri, 18 Mar 2016 10:27:47 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH 1/5] ftrace perf: Check sample types only for sampling
 events

On Wed, 16 Mar 2016 15:34:29 +0100
Jiri Olsa <jolsa@...nel.org> wrote:

> Currently we check sample type for ftrace:function event
> even if it's not created as sampling event. That prevents
> creating ftrace_function event in counting mode.
> 
> Making sure we check sample types only for sampling events.
> 
> Before:
>   $ sudo perf stat -e ftrace:function ls
>   ...
> 
>    Performance counter stats for 'ls':
> 
>      <not supported>      ftrace:function
> 
>          0.001983662 seconds time elapsed
> 
> After:
>   $ sudo perf stat -e ftrace:function ls
>   ...
> 
>    Performance counter stats for 'ls':
> 
>               44,498      ftrace:function
> 
>          0.037534722 seconds time elapsed
> 
> Suggested-by: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve