[PATCH 2/3] EXA: Fix migration avoidance for 1x1 pixmaps.

[Michel Dänzer]

On Mon, 2009-12-28 at 13:27 +0100, Maarten Maathuis wrote: 
> Why does it help to allocate the sys_ptr up front, why does that avoid
> migration (i would except sys_ptr to be allocated when needed)?

If the system copy is only allocated on a software fallback, the GPU
copy still needs to be read back at that point. The purpose of all this
code is to avoid that by keeping both copies in sync all the time.


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer