linux-kernel - Re: [PATCH 34/49] gma500: the GEM and GTT code is device independant

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Date:	Mon, 17 Oct 2011 15:34:29 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Rob Clark <rob.clark@...aro.org>,
	Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>, greg@...ah.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 34/49] gma500: the GEM and GTT code is device
 independant

On Mon, 17 Oct 2011, Alan Cox wrote:
> > It feels to me like GEM is pulling shmem in an ever more alien direction:
> > these device constraints are so foreign to the nature of tmpfs; and
> > beyond my expertise, so that I'd be ever more likely to make the wrong
> > decisions (mixing swap and uncached pages? hmmm).
> 
> For the most part we fixed that. You can now have a GEM object that is
> backed by a private memory object rather than having to be tmpfs.
> GMA500 uses it to attach 'stolen' memory to GEM handles, and at least
> one other pending submission uses it with a private CMA style allocator.

Sounds good.
> 
> The gma500 report seems an odd one - no GMA500 box has >4GB memory so how
> did the test code get a page that was unsuitable - is the test buggy ?

This is the first I heard of some gma500 test seeing a problem with >4GB.

In this thread we have Patrik hitting the oops in read_cache_page_gfp()
because of some changes he is preparing, but I thought he and Rob were
just thinking ahead when they raise the 4GB issue.

Can you point us to another thread on a another list?

Hugh
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