Date: Wed, 22 Apr 2009 11:16:45 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Tim Abbott <tabbott@MIT.EDU>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
       Steven Rostedt <rostedt@goodmis.org>, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       Anders Kaseorg <andersk@MIT.EDU>, Jeffrey B Arnold <jbarnold@MIT.EDU>
Subject: Re: [PATCH 1/5] ftrace: use module notifier for function tracer
Message-ID: <20090422091645.GB18226@elte.hu>
References: <20090416021830.556671772@goodmis.org> <20090416021928.040177084@goodmis.org> <200904192055.04213.rusty@rustcorp.com.au> <alpine.DEB.1.10.0904191437250.31802@vinegar-pot.mit.edu>
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* Tim Abbott <tabbott@MIT.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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