linux-kernel - Re: [RFC] [PATCH] DRM TTM Memory Manager patch

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Date:	Tue, 1 May 2007 20:59:43 -0700
From:	Greg KH <greg@...ah.com>
To:	Ingo Oeser <ioe-lkml@...eria.de>
Cc:	Dave Airlie <airlied@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Thomas Hellstr?m <thomas@...gstengraphics.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Eric Anholt <eric@...olt.net>
Subject: Re: [RFC] [PATCH] DRM TTM Memory Manager patch

On Wed, May 02, 2007 at 12:36:36AM +0200, Ingo Oeser wrote:
> On Tuesday 01 May 2007, Dave Airlie wrote:
> > >   - what's with the /proc interface?  Don't add new proc code for
> > >     non-process related things.  This should all go into sysfs
> > >     somewhere.  And yes, I know /proc/dri/ is there today, but don't add
> > >     new stuff please.
> > 
> > Well we should move all that stuff to sysfs, but we have all the
> > infrastructure for publishing this stuff under /proc/dri and adding
> > new files doesn't take a major amount, as much as I appreciate sysfs,
> > it isn't suitable for this sort of information dump, the whole one
> > value per file is quite useless to provide this sort of information
> > which is uni-directional for users to send to us for debugging without
> > have to install some special tool to join all the values into one
> > place.. and I don't think drmfs is the answer either... or maybe it
> > is....
> 
> Ok, what about debugfs then? If it is just for debugging blobs -> debugfs,
> if it is crucial for operation -> sysfs and representation of one value 
> per file.

You beat me too it :)

Yes, this is _exactly_ what debugfs is for, in fact, it will probably
make your code a bit smaller to use it instead of /proc.

thanks,

greg k-h
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