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Re: [PATCH -tip v10 0/9] kprobes: Kprobes jump optimization support
- From: Masami Hiramatsu <mhiramat at redhat dot com>
- To: rostedt at goodmis dot org
- Cc: Frederic Weisbecker <fweisbec at gmail dot com>, Ingo Molnar <mingo at elte dot hu>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, lkml <linux-kernel at vger dot kernel dot org>, Jim Keniston <jkenisto at us dot ibm dot com>, Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>, Christoph Hellwig <hch at infradead dot org>, "H. Peter Anvin" <hpa at zytor dot com>, Anders Kaseorg <andersk at ksplice dot com>, Tim Abbott <tabbott at ksplice dot com>, Andi Kleen <andi at firstfloor dot org>, Jason Baron <jbaron at redhat dot com>, Mathieu Desnoyers <compudj at krystal dot dyndns dot org>, systemtap <systemtap at sources dot redhat dot com>, DLE <dle-develop at lists dot sourceforge dot net>
- Date: Tue, 23 Feb 2010 17:27:52 -0500
- Subject: Re: [PATCH -tip v10 0/9] kprobes: Kprobes jump optimization support
- References: <20100218221247.19637.80088.stgit@dhcp-100-2-132.bos.redhat.com> <1266944834.24271.6021.camel@gandalf.stny.rr.com>
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@redhat.com