Thanks for reply, this patch is mainly for performance reason. since TTM
is to clear page for all non-fixed memory (GTT and CPU domains), which
takes much more CPU overhead. The patch is to remove 'clear page' for
GTT domain.
btw: Micheal has rejected this patch.
Regards,
David Zhou (Chunming)
On 2016年01月05日 22:32, Lucas Stach wrote:
Hi David,
why is this patch 2/4 if it's just a single patch?
Am Dienstag, den 05.01.2016, 11:55 +0800 schrieb david1.zhou@xxxxxxx:
From: Chunming Zhou <David1.Zhou@xxxxxxx>
Change-Id: I653d61e32faaa11c39bb978bf90301513a0c35b8
This change-id is just pure noise when you submit something upstream.
Please add a proper change log on why the change below is
necessary/helpful.
Regards,
Lucas
Signed-off-by: Chunming Zhou <David1.Zhou@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
b/drivers/gpu/drm/ttm/ttm_bo.c
index 745e996..0633b65 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -301,6 +301,7 @@ static int ttm_bo_handle_move_mem(struct
ttm_buffer_object *bo,
if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
if (bo->ttm == NULL) {
bool zero = !(old_man->flags &
TTM_MEMTYPE_FLAG_FIXED);
+ zero = (mem->mem_type == TTM_PL_SYSTEM) ?
zero : false;
ret = ttm_bo_add_ttm(bo, zero);
if (ret)
goto out_err;
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