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sync: optimize fence merges

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If the two fences being merged contain sync_pts from the same timeline,
those two pts will be collapsed into a single pt representing the latter
of the two.

Change-Id: Iced7ebb7e5a17a0c8b1a2969ba3388a4edb9ecaf
Signed-off-by: Erik Gilling <konkers@android.com>
Signed-off-by: Ajay Dudani <adudani@codeaurora.org>
This commit is contained in:
Ajay Dudani
2012-07-11 17:13:50 -07:00
committed by Iliyan Malchev
parent c7f11c39a8
commit a67bfd0627
1 changed files with 50 additions and 1 deletions
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51
drivers/base/sync.c
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@@ -314,6 +314,55 @@ static int sync_fence_copy_pts(struct sync_fence *dst, struct sync_fence *src)
return 0;
}
static int sync_fence_merge_pts(struct sync_fence *dst, struct sync_fence *src)
{
struct list_head *src_pos, *dst_pos, *n;
list_for_each(src_pos, &src->pt_list_head) {
struct sync_pt *src_pt =
container_of(src_pos, struct sync_pt, pt_list);
bool collapsed = false;
list_for_each_safe(dst_pos, n, &dst->pt_list_head) {
struct sync_pt *dst_pt =
container_of(dst_pos, struct sync_pt, pt_list);
/* collapse two sync_pts on the same timeline
* to a single sync_pt that will signal at
* the later of the two
*/
if (dst_pt->parent == src_pt->parent) {
if (dst_pt->parent->ops->compare(dst_pt, src_pt) == -1) {
struct sync_pt *new_pt =
sync_pt_dup(src_pt);
if (new_pt == NULL)
return -ENOMEM;
new_pt->fence = dst;
list_replace(&dst_pt->pt_list,
&new_pt->pt_list);
sync_pt_activate(new_pt);
sync_pt_free(dst_pt);
}
collapsed = true;
break;
}
}
if (!collapsed) {
struct sync_pt *new_pt = sync_pt_dup(src_pt);
if (new_pt == NULL)
return -ENOMEM;
new_pt->fence = dst;
list_add(&new_pt->pt_list, &dst->pt_list_head);
sync_pt_activate(new_pt);
}
}
return 0;
}
static void sync_fence_free_pts(struct sync_fence *fence)
{
struct list_head *pos, *n;
@@ -388,7 +437,7 @@ struct sync_fence *sync_fence_merge(const char *name,
if (err < 0)
goto err;
err = sync_fence_copy_pts(fence, b);
err = sync_fence_merge_pts(fence, b);
if (err < 0)
goto err;