linux-kernel - Re: [RFC PATCH -tip 0/9]ftrace, kprobes: Ftrace-based kprobe optimization

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Message-ID: <4FCCA8E7.5070407@hitachi.com>
Date:	Mon, 04 Jun 2012 21:24:07 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [RFC PATCH -tip  0/9]ftrace, kprobes: Ftrace-based kprobe optimization

(2012/06/04 21:07), Steven Rostedt wrote:
> On Mon, 2012-06-04 at 20:45 +0900, Masami Hiramatsu wrote:
>> I think if I just register kprobe's ftrace_ops without start
>> tracing, I think we can just do tracing without "notrace".
> 
> You should be able to register the filter first, and then register
> function tracer. If you register without setting the filter, you will
> start tracing all functions.
> 
> I think that may be the problem you are seeing. You want to register the
> filter first and then the ftrace_ops.

Ah, that's all what I need to know! :)
OK, I'll do that for avoiding recursion problem.

Thanks!


-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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