[PATCH] drm: reorder drm_open_hash to remove padding on 64 bit builds

Richard Kennedy richard at rsk.demon.co.uk
Tue Mar 1 06:09:16 PST 2011

Remove 8 bytes of padding on 64 bit builds to reduce the size of
drm_open_hash to 24 bytes, which also shrinks drm_object_file by 24
bytes (136 -> 112) allowing it to fit in one fewer cache lines and a
smaller slab.

Signed-off-by: Richard Kennedy <richard at rsk.demon.co.uk>
patch against v2.6.38-rc6
compiled & tested on x86_64 with nouveau.


diff --git a/include/drm/drm_hashtab.h b/include/drm/drm_hashtab.h
index 0af087a..ff2ab48 100644
--- a/include/drm/drm_hashtab.h
+++ b/include/drm/drm_hashtab.h
@@ -48,8 +48,8 @@ struct drm_open_hash {
 	unsigned int size;
 	unsigned int order;
 	unsigned int fill;
-	struct hlist_head *table;
 	int use_vmalloc;
+	struct hlist_head *table;

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