Re: [PATCH] mm: Work around Intel SNB GTT bug with some physicalpages.
From: Daniel Vetter
Date: Tue May 08 2012 - 13:22:43 EST
On Tue, May 08, 2012 at 08:25:38AM -0700, Linus Torvalds wrote:
> On Mon, May 7, 2012 at 4:13 PM, Stéphane Marchesin <marcheu@xxxxxxxxxxxx> wrote:
> > In the end, I came up with the ugly workaround of just leaking the
> > offending pages in shmem.c.
> Don't leak it.
> Instead, add it to some RCU list, and free it using RCU. Or some
> one-second timer or something.
> That kind of approach should guarantee that it
> (a) gets returned to the system
> (b) the returning to the system gets delayed sufficiently that if the
> i915 driver is doing lots of allocations it will be getting other
The problem is also that this only affects Sandybdrige gpus, so we'd need
to funnel this down to shmfs somehow ... Rob Clarke from Linaro will be
working on a gemfs to make backing storage allocation more flexible - they
need that to support some arm gpus. That way round we wouldn't need to put
some ugly drm/i915 stuff into core shmfs. Rob?
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