linux-kernel - Re: [patch 0/6] fault vs truncate/invalidate race fix

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Date:	Tue, 27 Feb 2007 17:26:28 +1100
From:	"Dave Airlie" <airlied@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	npiggin@...e.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: [patch 0/6] fault vs truncate/invalidate race fix

On 2/27/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > On Tue, 27 Feb 2007 15:36:03 +1100 "Dave Airlie" <airlied@...il.com> wrote:
> > >
> > > I've also got rid of the horrible populate API, and integrated nonlinear pages
> > > properly with the page fault path.
> > >
> > > Downside is that this adds one more vector through which the buffered write
> > > deadlock can occur. However this is just a very tiny one (pte being unmapped
> > > for reclaim), compared to all the other ways that deadlock can occur (unmap,
> > > reclaim, truncate, invalidate). I doubt it will be noticable. At any rate, it
> > > is better than data corruption.
> > >
> > > I hope these can get merged (at least into -mm) soon.
> >
> > Have these been put into mm?
>
> Not yet - I need to get back on the correct continent, review the code,
> stuff like that.  It still hurts that this work makes the write() deadlock
> harder to hit, and we haven't worked out how to fix that.
>
> > can I expect them in the next -mm so I
> > can start merging up the drm memory manager code to my -mm tree..
>
> What is the linkage between these patches and DRM?
>

the new fault hander made the memory manager code a lot cleaner and
very less hacky in a lot of cases. so I'd rather merge the clean code
than have to fight with the current code...

Dave.
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