linux-kernel - Re: [PATCH 1/7] dynamic debug v2

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Message-ID: <20080717225611.GA27481@isilmar.linta.de>
Date:	Fri, 18 Jul 2008 00:56:11 +0200
From:	Dominik Brodowski <linux@...inikbrodowski.net>
To:	Greg KH <greg@...ah.com>
Cc:	Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, joe@...ches.com, nick@...k-andrew.net,
	randy.dunlap@...cle.com
Subject: Re: [PATCH 1/7] dynamic debug v2 - infrastructure

Hi,

On Thu, Jul 17, 2008 at 03:32:22PM -0700, Greg KH wrote:
> > that is correct. any callers of dev_dbg() don't have to do anything. its really
> > only the more complex debugging, where there are flags or levels that need to
> > make adjustments to work with the new infrastructure.
> 
> For this reason alone, I see no reason why your patch should not be
> merged today.  You don't need the other subsystems at this point in time
> in my opinion, it's benifit is huge already.

not to object to this statement, but:

what about the user-visible interface? currently, it's based around one big
debugfs file. What about doing

	<debugfs>/dynamic_printk/<module_name>/{enabled[,level][,flag][,modules]}

instead, or even

	<sysfs>/module/<module_name>/debug/{enabled[,level][,flag]}

For "shared" modules like cpufreq (only user so far, AFAICS), things might
get a bit more interesting, but we found that out already in the other
thread ;)

Best wishes,
	Dominik
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