linux-kernel - Re: [RFC 00/14] perf tools: Introduce new 'ftrace' command

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Message-ID: <87sj2f9n8o.fsf@sejong.aot.lge.com>
Date:	Thu, 25 Apr 2013 14:45:59 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	"zhangwei\(Jovi\)" <jovi.zhangwei@...wei.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	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>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC 00/14] perf tools: Introduce new 'ftrace' command

Hi Jovi,

On Wed, 24 Apr 2013 19:14:49 +0800, zhangwei wrote:
> On 2013/4/24 17:27, Namhyung Kim wrote:
>>> Also, have you given thought on how to execute both ftrace and the pmu
>>> counters? That is, to get a way to interleave the data?
>> 
>> I didn't think about it yet.  I just thought enabling event tracing in
>> ftrace and get the data along with the function tracing.  I'm not sure
>> how they interfere each other when enabled at the same time.
>> 
>> If that's not a valid concern, I think it's doable.
>
> There have ftrace:function event in tracing infrastructure, that event works in perf,
> but I'm not sure if it could enhance to showing function graph as this patchset did.
> 	perf record -e ftrace:function ls > /dev/null
> 	perf report

Yes, I know that.

When I asked to Steve that how I can use ftrace:funcgraph_{entry,exit}
as tracepoint events in perf tools, he said it'd be a non-trivial job
and need some amount of scary work. :)

Thanks,
Namhyung
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