linux-kernel - Re: [PATCH -tip 0/4 V3] tracing: kprobe-based event tracer

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Message-ID: <49D3D3B4.4060702@redhat.com>
Date:	Wed, 01 Apr 2009 16:51:00 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ibm.com>
Subject: Re: [PATCH -tip 0/4 V3] tracing: kprobe-based event tracer

Andi Kleen wrote:
> Masami Hiramatsu <mhiramat@...hat.com> writes:
>> I agreed. Fortunately, Jim Keniston and I wrote an x86 instruction
>> decoder :-) which has been made originally for uprobe andd kprobes
>> jump-optimizer.
>>
>> https://www.redhat.com/archives/utrace-devel/2009-March/msg00031.html
> 
> An alternative would be to adapt the x86 interpreter in KVM.
> I thought for some time that that one should be available in 
> a more generic form in a library.

As far as I can see, KVM's instruction emulator is incomplete
(it doesn't cover all instructions...) and aims to emulate
instructions, not to analyze (so I couldn't relay on it).

Anyway, I think making x86 interpreter in a library is a good idea.

Thank you,

> 
> -Andi
> 

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

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

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