From: "Stephen C. Tweedie" <sct@redhat.com>
To: James Simmons <jsimmons@edgeglobal.com>
Cc: "Stephen C. Tweedie" <sct@redhat.com>,
Marcus Sundberg <erammsu@kieraypc01.p.y.ki.era.ericsson.se>,
Vladimir Dergachev <vdergach@sas.upenn.edu>,
linux-mm@kvack.org
Subject: Re: accel handling
Date: Tue, 31 Aug 1999 19:44:35 +0100 (BST) [thread overview]
Message-ID: <14284.8851.865175.995828@dukat.scot.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.10.9908311307451.14957-100000@imperial.edgeglobal.com>
Hi,
On Tue, 31 Aug 1999 13:10:46 -0400 (EDT), James Simmons
<jsimmons@edgeglobal.com> said:
>> Yes. The biggest problem is that the VM currently has no support for
>> demand-paging of an entire framebuffer region, and taking a separate
>> page fault to fault back the mapping of every page in the framebuffer
>> would be too slow. As long as we can switch the entire framebuffer in
>> and out of the mapping rapidly, things aren't too bad.
>>
> So if this is the problem could we write a special routine that optimizes
> this. What if we gave the VM support for demand paging of an entire
> framebuffer region.
You cut out the most important part of my email, which was that such
support would be prohibitively expensive for any graphics-intensive
applications. It is only feasible if there is a very low rate of
switching between accel and framebuffer access.
--Stephen
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next prev parent reply other threads:[~1999-08-31 18:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-08-29 14:52 James Simmons
1999-08-29 16:14 ` Stephen C. Tweedie
1999-08-30 1:14 ` James Simmons
1999-08-30 10:44 ` Stephen C. Tweedie
1999-08-30 12:06 ` Marcus Sundberg
1999-08-30 14:18 ` Stephen C. Tweedie
1999-08-30 14:50 ` James Simmons
1999-08-30 15:52 ` Stephen C. Tweedie
1999-08-30 17:51 ` James Simmons
1999-08-30 20:27 ` Stephen C. Tweedie
1999-08-31 0:28 ` Vladimir Dergachev
1999-08-31 10:55 ` Marcus Sundberg
1999-08-31 12:49 ` Stephen C. Tweedie
1999-08-31 17:10 ` James Simmons
1999-08-31 18:44 ` Stephen C. Tweedie [this message]
1999-08-30 14:31 ` James Simmons
1999-08-30 18:51 ` Eric W. Biederman
1999-08-30 19:18 ` James Simmons
1999-08-30 21:39 ` Andreas Beck
1999-08-30 20:36 ` Stephen C. Tweedie
1999-08-29 14:57 James Simmons
1999-08-31 3:39 Jens Owen
1999-08-31 12:51 ` Stephen C. Tweedie
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