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

[Maarten Maathuis]

Acked-by: Maarten Maathuis <madman2003 at gmail.com>

2009/12/28 Michel Dänzer <michel at daenzer.net>:
> 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
>