linux-kernel - Re: [PATCH 1/5] ftrace: use module notifier for function tracer

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Message-ID: <20090422091645.GB18226@elte.hu>
Date:	Wed, 22 Apr 2009 11:16:45 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tim Abbott <tabbott@....EDU>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Anders Kaseorg <andersk@....edu>,
	Jeffrey B Arnold <jbarnold@....edu>
Subject: Re: [PATCH 1/5] ftrace: use module notifier for function tracer


* Tim Abbott <tabbott@....EDU> wrote:

> On Sun, 19 Apr 2009, Rusty Russell wrote:
> 
> > I think you need to do something else in general.  Share the module_mutex for
> > the ftrace code?  The ksplice guys have a similar issue, so maybe we should
> > generalize this into a "kernel_text" mutex?
> 
> Yes, a kernel_text mutex is on my list of things to propose once 
> Ksplice gets merged.

too late :-) These bits were written 1.5 months ago and are already 
upstream:

3945dab: tracing, Text Edit Lock - SMP alternatives support
4460fda: tracing, Text Edit Lock - kprobes architecture independent support
0e39ac4: tracing, Text Edit Lock - Architecture Independent Code

I suspect ksplice could make use of text_mutex?

	Ingo
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