Re: [PATCH] Export shmem_file_setup and shmem_getpage for DRM-GEM

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To: John Stoffel <john@...>
Cc: <keithp@...>, Hugh Dickins <hugh@...>, Nick Piggin <nickpiggin@...>, Christoph Hellwig <hch@...>, Eric Anholt <eric@...>, <linux-kernel@...>
Date: Tuesday, August 5, 2008 - 12:28 am

On Mon, 2008-08-04 at 22:25 -0400, John Stoffel wrote:


Right now, I'm working only on Intel integrated graphics, which doesn't
have any on-board memory. My thinking is that we'd best solve the
easiest case first before attempting the harder discrete graphics
driver. Plus, Intel pays me do do integrated graphics, so I have an
incentive.

Not that we haven't been thinking about how this plays with a discrete
card; we'll need to allocate backing store for any objects which are
placed in on-card memory in case we run out of on-card memory, and also
as a place to store objects when the system suspends. From the
perspective of shmem, it should be precisely the same; allocating
anonymous pages and handing them to the DRM driver to store video card
data.


Yup, I think you understand the situation fairly well. I've got a big
pile of pages sitting idle in the GTT which could be pulled out and
given back to the system. I like to keep a bunch around as the cost of
getting pages out of the CPU cache and bound to the GTT is non-trivial,
but if there's any memory pressure, the cost to free them is quite low.

--=20
keith.packard@intel.com
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Messages in current thread:
[PATCH] PCI: Add pci_read_base() API, Eric Anholt, (Fri Aug 1, 2:58 am)
Re: [PATCH] Export shmem_file_setup and shmem_getpage for DR..., Christoph Hellwig, (Sun Aug 10, 9:30 pm)
Re: [PATCH] Export shmem_file_setup and shmem_getpage for DR..., Keith Packard, (Tue Aug 5, 12:28 am)
Re: [PATCH] Export shmem_file_setup and shmem_getpage for DR..., Stephane Marchesin, (Wed Aug 6, 12:20 pm)
Re: [PATCH] Export shmem_file_setup and shmem_getpage for DR..., Christoph Hellwig, (Sun Aug 10, 9:34 pm)
Re: [PATCH] Export shmem_file_setup and shmem_getpage for DR..., Stephane Marchesin, (Wed Aug 6, 10:16 pm)
Re: [PATCH] Export shmem_file_setup and shmem_getpage for DR..., Stephane Marchesin, (Wed Aug 6, 1:32 pm)
Re: [PATCH] Export shmem_file_setup and shmem_getpage for DR..., Stephane Marchesin, (Wed Aug 6, 2:09 pm)
Re: [PATCH] Export shmem_file_setup and shmem_getpage for DR..., Christoph Hellwig, (Sun Aug 10, 9:23 pm)
Re: [PATCH] Export shmem_file_setup for DRM-GEM, Keith Packard, (Sun Aug 10, 11:03 pm)