linux-kernel - Re: [PATCH -tip v2 0/9]ftrace,kprobes: Ftrace-based kprobe optimization

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Message-ID: <1338896927.13348.536.camel@gandalf.stny.rr.com>
Date:	Tue, 05 Jun 2012 07:48:47 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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: [PATCH -tip v2 0/9]ftrace,kprobes: Ftrace-based kprobe
 optimization

On Tue, 2012-06-05 at 19:27 +0900, Masami Hiramatsu wrote:
> Hi Steven,
> 
> Here is the version 2 patches for kprobe-ftrace. Since I didn't
> touch ftrace part in this version, old gcc bug still be there.
> So, if you have another implementation, prease replace former 3
> patches in this series with your patch.
> 

Thanks Masami,

I'll be incorporating these patches into my own set, and see how they
fit. I would have had more done yesterday, but I'm also testing against
PPC and discovered a bug in the PPC function tracing and was side
tracked in fixing it (ended up being a new function that had to be
tagged with 'notrace').


> ftrace_ops.regs_func is still under discussion because older
> gcc doesn't support initalizing unnamed union member.

Right, I working on adding the ops and regs parameters for all users,
and working on making sure this work for other archs. I'll be testing
against i386, x86_64, PPC64, PPC32, and ARM (snowball board, and this is
the perfect excuse for me to get my panda board running too :-)

Thanks!

-- Steve

> 
> In this version, I've removed notrace dependency from __kprobes.
> Instead, it just set filter correctly before adding ftrace_ops
> not to trace all functions.
> 
> Changes in v2:
>  - Fix ftrace_ops registering right after setting its filter.
>  - Unregister ftrace_ops if there is no kprobe useing.
>  - Remove notrace dependency from __kprobes macro.
> 


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