linux-kernel - Re: [PATCH -tip v5 07/10] kprobes/x86: Support kprobes jump optimization on x86

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Message-ID: <4B0C0B50.6000907@zytor.com>
Date:	Tue, 24 Nov 2009 08:35:28 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	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>,
	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 07/10] kprobes/x86: Support kprobes jump optimization
 on x86

On 11/23/2009 03:22 PM, Masami Hiramatsu wrote:
> 
> This uses stop_machine() for corss modifying code from int3 to jump.
> It doesn't allow us to modify code on NMI/SMI path. However, since
> kprobes itself doesn't support NMI/SMI code probing, it's not a
> problem.
> 

I'm a bit confused by the above statement... does that mean you're
poking int3 and *then* do stop_machine()?

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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