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Re: [PATCH -tip v5 0/7] tracing: kprobe-based event tracer and x86 instruction decoder
- From: Masami Hiramatsu <mhiramat at redhat dot com>
- To: Ingo Molnar <mingo at elte dot hu>
- Cc: Steven Rostedt <rostedt at goodmis dot org>, lkml <linux-kernel at vger dot kernel dot org>, Avi Kivity <avi at redhat dot com>, "H. Peter Anvin" <hpa at zytor dot com>, Frederic Weisbecker <fweisbec at gmail dot com>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Andrew Morton <akpm at linux-foundation dot org>, Andi Kleen <andi at firstfloor dot org>, Jim Keniston <jkenisto at us dot ibm dot com>, "K.Prasad" <prasad at linux dot vnet dot ibm dot com>, KOSAKI Motohiro <kosaki dot motohiro at jp dot fujitsu dot com>, systemtap <systemtap at sources dot redhat dot com>, kvm <kvm at vger dot kernel dot org>
- Date: Tue, 12 May 2009 18:03:02 -0400
- Subject: Re: [PATCH -tip v5 0/7] tracing: kprobe-based event tracer and x86 instruction decoder
- References: <20090509004829.5505.38720.stgit@localhost.localdomain> <20090509044302.GH8007@elte.hu>
Ingo Molnar wrote:
> * Masami Hiramatsu <mhiramat@redhat.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@redhat.com