linux-kernel - Re: [PATCH 0/8] dynamic debug

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Message-ID: <20080618160223.GA9453@kroah.com>
Date:	Wed, 18 Jun 2008 09:02:23 -0700
From:	Greg KH <greg@...ah.com>
To:	Takashi Nishiie <t-nishiie@...css.fujitsu.com>
Cc:	'Jason Baron' <jbaron@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, joe@...ches.com,
	nick@...k-andrew.net, randy.dunlap@...cle.com
Subject: Re: [PATCH 0/8] dynamic debug

On Mon, Jun 16, 2008 at 11:26:12AM +0900, Takashi Nishiie wrote:
> Hi.
> 
> Jason Baron wrote:
> >Each kernel sub-system seems to have its own way of dealing with 
> >debugging statements. Some of these methods include 'dprintk', 
> >'pr_debug', 'dev_debug', 'DEBUGP'. There are also a myriad of 
> >ways of enabling these statements. 
> 
>  I propose to replace 'Pr_debug', 'Dev_debug', and 'DEBUGP' with 
> kernel markers. SystemTap is used for the output of the log.  

That would be a nice goal, but how are you going to handle dynamic
strings?

>  I propose to make it to the function to output only specified 
> kernel markers as a log and the function in a word like LTTng of
> a simple version by using the framework and kernel markers of 
> ftrace if the log is output by using debugfs. 

It might be a nice long term goal, but this patchset is a much simpler
approach for this time, not requiring systemtap or any external tool-set
to be installed and set up properly.

thanks,

greg k-h
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