linux-kernel - Re: [PATCH -tip v5 03/10] kprobes: Introduce kprobes jump optimization

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Message-ID: <20091124194524.GA5071@nowhere>
Date:	Tue, 24 Nov 2009 20:45:28 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Jim Keniston <jkenisto@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Anders Kaseorg <andersk@...lice.com>,
	Tim Abbott <tabbott@...lice.com>,
	Andi Kleen <andi@...stfloor.org>,
	Jason Baron <jbaron@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [PATCH -tip v5 03/10] kprobes: Introduce kprobes jump
	optimization

On Tue, Nov 24, 2009 at 10:34:08AM -0500, Masami Hiramatsu wrote:
> > And this comment doesn't tell us much what this brings us.
> > The changelog tells it stands to avoid a text_mutex deadlock.
> > I'm not sure why we would deadlock without it.
> 
> As Mathieu and I discussed on LKML (http://lkml.org/lkml/2009/11/21/187)
> text_mutex will be locked on the way of cpu-hotplug.
> Since kprobes locks text_mutex too and stop_machine() refers online_cpus,
> it will cause a dead-lock. So, I decided to use get_online_cpus() to
> locking hotplug while optimizing/unoptimizng.


Ah ok :)
Could you add a comment in the code that explains it?

Thanks.

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