Hmm, in function ttm_bo_mem_space:
for (i = 0; i <= placement->num_busy_placement; ++i) {
ret = ttm_mem_type_from_flags(placement->placement[i],
&mem_type);
Is the "placement->placement[i]" typo error or something else? I think it
should be "busy_placement"
2009/12/15 Jerome Glisse <gli...@freedesktop.org>
> On Tue, Dec 15, 2009 at 02:04:01PM +0800, Donnie Fang wrote:
> > Hi Jerome,
> > The field busy_placement in struct ttm_placement hasn't been used
> > yet. what is this field exact usage? Do you mean TTM core can reference
> this
> > field when do bo evict? But i can't find out any clue about this.
> >
>
> This field purpose was explain in a mail on dri-devel. It's used
> when we need to evict buffer to allow driver to choose alternates
> placements order in this case. For instance:
> placement= 1 vram, 2 gtt
> busy_placement=1 gtt, 2 vram
>
> If there is not enough place in vram or gtt, ttm will start evicting
> bo from gtt and put the bo their, if after evicting from gtt it still
> hasn't enough place it will evict from vram (2 in busy_placement) and
> try there.
>
> Cheers,
> Jerome
>
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