Re: accel handling

James Simmons
1999-08-31T17:10:46Z

> Hi,
>
> On Tue, 31 Aug 1999 12:55:26 +0200, Marcus Sundberg
> <erammsu@kieraypc01.p.y.ki.era.ericsson.se> said:
>
> > But by only re-mapping the framebuffer on demand as Stephen said you
> > can avoid repeatedly un-mapping the framebuffer for processes/threads
> > that doesn't use it.
>
> 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.