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Date: Wed, 12 Aug 2009 17:27:16 -0400
From: Masami Hiramatsu <mhiramat@redhat.com>
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To: Peter Zijlstra <peterz@infradead.org>
CC: Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>,
       Lai Jiangshan <laijs@cn.fujitsu.com>,
       Steven Rostedt <rostedt@goodmis.org>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       Jiaying Zhang <jiayingz@google.com>, Martin Bligh <mbligh@google.com>,
       Li Zefan <lizf@cn.fujitsu.com>, Jason Baron <jbaron@redhat.com>
Subject: Re: [RFD] Kprobes/Kretprobes perf support
References: <1250016545-6601-1-git-send-email-fweisbec@gmail.com>	 <4A82EEC5.8000603@redhat.com> <4A82F5A0.2090603@redhat.com>	 <20090812191305.GB5974@nowhere> <1250111397.7035.1.camel@laptop>
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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@redhat.com