VGA arbiter: removing RAC

[Luc Verhaegen]

On Wed, Dec 19, 2007 at 10:43:58PM -0200, Tiago Vignatti wrote:
> Joerg Sonnenberger escreveu:
> > On Wed, Dec 19, 2007 at 08:45:53PM -0200, Tiago Vignatti wrote:
> >> The Resource Access Control inside Xorg is the guy responsible to take 
> >> care of the various resources of memory and to share them in a wise 
> >> manner when two or more graphics devices are active (think multi-head). 
> >> As an alternative from RAC we can rely on VGA arbiter.
> > 
> > How much work is the kernel part of the arbiter? You know, the Xserver
> > is not only used on Linux :-)
> 
> git-clone http://www.inf.ufpr.br/ribas/repos/vga-module.git
> 
> for more info about the code, please see
> http://lists.freedesktop.org/archives/xorg/2007-November/030420.html
> 
> And yes, unfortunately we will need to keep the RAC module together with 
> the VGA arbiter inside Xorg for some time due the portability of Xorg. 
> Probably let autoconf set if Xorg needs RAC or the arbiter depending the 
> OS would be fine and easy to do.
> 
> 
> Cheers,
> 
> -- 
> Tiago Vignatti

How compatible is this module? Against which kernels is it known to 
build and work?

How hard is it to switch between this and RAC when the X server is 
started? At least for the time being. This because i fear that going 
for build time only immediately is too big a leap. After most of the 
initial pain is over, buildtime seems like the way to go.

Luc Verhaegen.
SUSE/Novell X Driver Developer.