linux-kernel - Re: [PATCH] [CFT] Code clarification patch to Kprobes arch code

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Message-ID: <20080102145908.GA6527@in.ibm.com>
Date:	Wed, 2 Jan 2008 20:29:08 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Quentin Barnes <qbarnes@...il.com>, linux-kernel@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH] [CFT] Code clarification patch to Kprobes arch code

On Wed, Jan 02, 2008 at 01:33:55PM +0100, Ingo Molnar wrote:
> 
> * Ananth N Mavinakayanahalli <ananth@...ibm.com> wrote:
> 
> > > Signed-off-by: Quentin Barnes <qbarnes@...il.com>
> > > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> > > Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > 
> > Tested on x86.
> > 
> > Acked-by: Ananth N Mavinakayahanalli <ananth@...ibm.com>
> 
> thanks Ananth, i've updated the patch.

Hi Ingo,

> btw., do you have some script that i could use to test kprobes 
> functionality? Right now the only time i notice kprobes regressions is 
> when randconfig picks up CONFIG_NET_TCPPROBE=y which activates kprobes.
> 
> It would be so much nicer if kprobes had some runs-during-bootup kind of 
> quick self-test, with all the important functionality unit-tested. Like 
> lib/locking-selftest.c, or CONFIG_RCU_TORTURE_TEST=y.

The simplest way to do a basic sanity check is build the kprobes samples/
and try them out. We have one sample each to test kprobes, kretprobes
and jprobes. This should serve the purpose.

I had posted patches for the same sometime back
(http://marc.info/?l=linux-kernel&m=119297044801420&w=2), but they needed
some rework to fix a build break on sparc64
(http://marc.info/?l=linux-kernel&m=119735423212298&w=2).

I will rebase the patchset against the latest mm and repost soon...

Ananth
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