linux-kernel - Re: [PATCH -tip v5 0/7] tracing: kprobe-based event tracer and x86 instruction decoder

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Date:	Tue, 12 May 2009 18:03:02 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>, Avi Kivity <avi@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Jim Keniston <jkenisto@...ibm.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH -tip v5 0/7] tracing: kprobe-based event tracer and x86
 instruction decoder

Ingo Molnar wrote:
> * Masami Hiramatsu <mhiramat@...hat.com> wrote:
> 
>> Hi,
>>
>> Here are the patches of kprobe-based event tracer for x86, version 
>> 5, which allows you to probe various kernel events through ftrace 
>> interface.
>>
>> This version supports only x86(-32/-64) (but porting it on other 
>> arch just needs kprobes/kretprobes and register and stack access 
>> APIs).
>>
>> This patchset also includes x86(-64) instruction decoder which 
>> supports non-SSE/FP opcodes and includes x86 opcode map. I think 
>> it will be possible to share this opcode map with KVM's decoder.
>>
>> This series can be applied on the latest linux-2.6-tip tree.
>>
>> This patchset includes following changes:
>> - Add x86 instruction decoder [1/7]
>> - Check insertion point safety in kprobe [2/7]
>> - Cleanup fix_riprel() with insn decoder [3/7]
>> - Add kprobe-tracer plugin [4/7]
>> - Fix kernel_trap_sp() on x86 according to systemtap runtime. [5/7]
>> - Add arch-dep register and stack fetching functions [6/7]
>> - Support fetching various status (register/stack/memory/etc.) [7/7]
>>
>> Future items:
>> - .init function tracing support.
>> - Support primitive types(long, ulong, int, uint, etc) for args.
> 
> Ok, this looks pretty complete already.
> 
> Two high-level comments:
> 
>  - There's no self-test - would it be possible to add one? See 
>    trace_selftest* in kernel/trace/
> 
>  - No generic integration.

Hmm, Ingo, could you tell me what I can do for the integration?
Would you means that I should use filters?

Thank you,

-- 
Masami Hiramatsu

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

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

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