linux-kernel - Re: [PATCH -tip v10 0/9] kprobes: Kprobes jump optimization support

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Message-ID: <4B845668.5090803@redhat.com>
Date:	Tue, 23 Feb 2010 17:27:52 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	rostedt@...dmis.org
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.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 <compudj@...stal.dyndns.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: Re: [PATCH -tip v10 0/9] kprobes: Kprobes jump optimization support

Steven Rostedt wrote:
> On Thu, 2010-02-18 at 17:12 -0500, Masami Hiramatsu wrote:
> 
>> This version of patch series uses text_poke_smp() which
>> update kernel text by stop_machine(). That is 'officially'
>> supported on Intel's processors. text_poke_smp() can't
>> be used for modifying NMI code,
> 
> But it can be made to use with NMI code. If you look at what I did to
> allow ftrace to modify NMI code, it may be able to do the same thing.

Yeah, I know. But basically, kprobes doesn't support probing NMI.
Maybe, it's possibly the next step. :)

Thank you,

-- 
Masami Hiramatsu
e-mail: mhiramat@...hat.com
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