Message-ID: <4B0C0B50.6000907@zytor.com>
Date: Tue, 24 Nov 2009 08:35:28 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Masami Hiramatsu <mhiramat@redhat.com>
CC: Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@elte.hu>,
       Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
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       systemtap <systemtap@sources.redhat.com>,
       DLE <dle-develop@lists.sourceforge.net>,
       Jim Keniston <jkenisto@us.ibm.com>,
       Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
       Christoph Hellwig <hch@infradead.org>,
       Steven Rostedt <rostedt@goodmis.org>,
       Anders Kaseorg <andersk@ksplice.com>, Tim Abbott <tabbott@ksplice.com>,
       Andi Kleen <andi@firstfloor.org>, Jason Baron <jbaron@redhat.com>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Subject: Re: [PATCH -tip v5 07/10] kprobes/x86: Support kprobes jump optimization
 on x86
References: <20091123232115.22071.71558.stgit@dhcp-100-2-132.bos.redhat.com> <20091123232211.22071.58974.stgit@dhcp-100-2-132.bos.redhat.com>
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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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