linux-kernel - Re: [PATCH 2/4] ftrace - add function

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Message-ID: <4B217586.5070700@am.sony.com>
Date:	Thu, 10 Dec 2009 14:26:14 -0800
From:	Tim Bird <tim.bird@...sony.com>
To:	"rostedt@...dmis.org" <rostedt@...dmis.org>
CC:	"Bird, Tim" <Timothy.Bird@...sony.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 2/4] ftrace - add function_duration tracer

Steven Rostedt wrote:
> On Thu, 2009-12-10 at 13:13 -0800, Tim Bird wrote:
>> I have some patches ...
>>  to make it possible to use arbitrary ftrace plugins
>> at boot time.  (There are issues with the current code for
>> anything other than the bootgraph plugin).
> 
> We already have a way to enable arbitrary ftrace plugins at boot time:
> 
> Try ftrace=function on the command line.

That's what I'm using, but my function_duration tracer didn't
work, because of an issue initializing the trace-option files.
The problem was that the debugfs wasn't initialized yet.
I worked up a simple fix to defer initializing the
trace-option files in debugfs until later in the boot
sequence.

Maybe you've already fixed this.  I'll check out the
latest code and see if I still have problems with it.
If so, I'll send the patches (which are quite small)
for consideration.
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================

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