some description:
for RB tree traveler we don't need to travel to
the bottom level if already found the equal size node,
thus the search performance can get improved.
Tested-by: Rex Zhu <Rex.zhu@xxxxxxx>
Signed-off-by: Monk Liu <Monk.Liu@xxxxxxx>
---
drivers/gpu/drm/drm_mm.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 3cc5fbd..369fd9b 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -318,6 +318,8 @@ static struct drm_mm_node *best_hole(struct drm_mm *mm, u64 size)
if (size <= node->hole_size) {
best = node;
rb = rb->rb_right;
+ if (size == node->hole_size)
+ break;
} else {
rb = rb->rb_left;
}
--
2.7.4
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