linux-kernel - Re: Replacement for page fault notifiers?

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Message-Id: <1199911268.11485.18.camel@dv>
Date:	Wed, 09 Jan 2008 15:41:08 -0500
From:	Pavel Roskin <proski@....org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	benh@...nel.crashing.org, Dave Airlie <airlied@...il.com>,
	Pekka Paalanen <pq@....fi>, linux-kernel@...r.kernel.org,
	jbeulich@...ell.com
Subject: Re: Replacement for page fault notifiers?


On Wed, 2008-01-09 at 20:26 +0000, Christoph Hellwig wrote:
> On Wed, Jan 09, 2008 at 03:24:16PM -0500, Pavel Roskin wrote:
> > I just assumed (wrongly, as it seems) that the API change didn't remove
> > any useful functionality.
> 
> No, this was exactly the correct assumption.  Out of tree modules simply
> don't count.
> 
> > The problem is that mmiotrace only makes sense in combination with
> > non-free drivers, and I'm not sure it would be welcome in the kernel
> > even if you say so.
> 
> It can trace every driver in theory although it's of course not
> really interesting for free drivers.  But it's not actually
> functionality used by the drivers but functionlity to trace the drivers
> so it's quite different anyway.

OK, that's reassuring.  Maybe it could be used for profiling or to find
bugs that are not obvious otherwise.

-- 
Regards,
Pavel Roskin
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