linux-kernel - Re: [RFD] Kprobes/Kretprobes perf support

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Message-ID: <4A8333B4.7020301@redhat.com>
Date:	Wed, 12 Aug 2009 17:27:16 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>, Jason Baron <jbaron@...hat.com>
Subject: Re: [RFD] Kprobes/Kretprobes perf support

Peter Zijlstra wrote:
> On Wed, 2009-08-12 at 21:13 +0200, Frederic Weisbecker wrote:
> 
>> Ingo, Peter do you have an idea on how we could do that?
> 
> Wouldn't it be easiest to use ftrace to create dynamic tracepoints in
> the ftrace way such that they become available in
> debugfs://tracing/events/kprobes/*/ and then have them interfaced the
> same way as all other tracepoints?

Yes, almost same. One big difference is that they are sharing
same event-id(TRACE_KPROBE and TRACE_KRETPROBE).
But I can make each kprobe events to have different ids, if you need.

Thank you,

-- 
Masami Hiramatsu

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

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

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