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drm/nouveau: Never evict VRAM buffers to system. 

VRAM->system is a synchronous operation: it involves scheduling a
VRAM->TT DMA transfer and stalling the CPU until it's finished so that
we can unbind the new memory from the translation tables. VRAM->TT can
always be performed asynchronously, even if TT is already full and we
have to move something out of it.

Additionally, allowing VRAM->system behaves badly under heavy memory
pressure because once we run out of TT, stuff starts to be moved back
and forth between VRAM and system, and the TT contents are hardly
renewed.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Francisco Jerez 2010-03-06 13:42:45 +01:00 committed by Ben Skeggs
parent d544d623c5
commit 965cf68e87
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/nouveau/nouveau_bo.c
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@ -439,8 +439,7 @@ nouveau_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
switch (bo->mem.mem_type) {
case TTM_PL_VRAM:
nouveau_bo_placement_set(nvbo, TTM_PL_FLAG_TT |
TTM_PL_FLAG_SYSTEM);
nouveau_bo_placement_set(nvbo, TTM_PL_FLAG_TT);
break;
default:
nouveau_bo_placement_set(nvbo, TTM_PL_FLAG_SYSTEM);