linux-kernel - Re: [RFC PATCH v2] trace: Move trace event enable from fs_initcall to early

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Date:	Wed, 05 Sep 2012 22:46:17 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ezequiel Garcia <elezegarcia@...il.com>
Cc:	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, tim.bird@...sony.com,
	lizefan@...wei.com
Subject: Re: [RFC PATCH v2] trace: Move trace event enable from fs_initcall
 to early_initcall

On Wed, 2012-09-05 at 13:53 -0400, Steven Rostedt wrote:
> On Tue, 2012-09-04 at 22:18 -0300, Ezequiel Garcia wrote:
> > Hi Steven,
> > 
> > On 8/17/12, Steven Rostedt <rostedt@...dmis.org> wrote:
> > > On Fri, 2012-08-17 at 09:03 -0300, Ezequiel Garcia wrote:
> > >> This patch splits trace event initialization in two stages:
> > >>  * ftrace enable
> > >>  * sysfs event entry creation
> > >>
> > >> This allows to capture trace events from an earlier point
> > >> by using 'trace_event' kernel parameter and is important
> > >> to trace boot-up allocations.
> > >>
> > >
> > > This is much better, I'll give it some tests and add it to my 3.7 queue.
> > >
> > 
> > Ping? Will you add this to your tree?
> 
> Yeah, I haven't been able to test it yet. I've been stuck trying to
> figure out bugs on other patches I have queued. I'll let you know when I
> do apply it though.

Just tested it and it failed :-/

Enable CONFIG_FTRACE_SELFTEST and CONFIG_FTRACE_STARTUP_TEST, along with
events and syscall events. The syscall event self test fails with this
patch applied.

-- Steve


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