linux-kernel - Re: [PATCH 10/19] perf ftrace: Add 'show' sub-command

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Message-ID: <877ggxy17f.fsf@sejong.aot.lge.com>
Date:	Thu, 11 Jul 2013 17:01:40 +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 10/19] perf ftrace: Add 'show' sub-command

On Wed, 10 Jul 2013 16:41:48 +0200, Jiri Olsa wrote:
> On Wed, Jun 26, 2013 at 04:14:13PM +0900, Namhyung Kim wrote:
>> From: Namhyung Kim <namhyung.kim@....com>
>> 
>> The ftrace show subcommand is for viewing recorded ftrace files.  It
>> enters perf.data.dir directory and open perf.header file to find out
>> necessary information.  And then read out per-cpu trace records using
>> kbuffer helper and print them to stdout in time order.
>> 
>> It only shows its basic form so function graph doesn't show duration/
>> overhead and no leaf entry handling is provided yet.  Maybe it can be
>> handled by a proper plugin in the libtraceevent.
>> 
>
> [jolsa@...va perf]$ sudo ./perf ftrace show -i perf.data.dir/
> failed to open perf.data.dir/.dir/perf.header: No such file or directory
>
> I'd expect any directory name is possible

Oops, right!  I should handle the case.

Thanks,
Namhyung
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