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authorRichard Kennedy <richard@rsk.demon.co.uk>2010-10-26 14:21:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 16:52:09 -0700
commit182fea8f48332de085c0ae936605cb72671db9f2 (patch)
tree6938047591e9077c416b972c176d4d1d716d95a7 /include
parentea05c8444e451f1cfbf78c68733e717ad7b8602b (diff)
mm: remove alignment padding from anon_vma on (some) 64 bit builds
Reorder structure anon_vma to remove alignment padding on 64 builds when (CONFIG_KSM || CONFIG_MIGRATION). This will shrink the size of the anon_vma structure from 40 to 32 bytes & allow more objects per slab in its kmem_cache. Under slub the objects in the anon_vma kmem_cache will then be 40 bytes with 102 objects per slab. (On v2.6.36 without this patch,the size is 48 bytes and 85 objects/slab.) Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Reviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/rmap.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 31b2fd75dcba..5c98df68a953 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -25,8 +25,8 @@
* pointing to this anon_vma once its vma list is empty.
*/
struct anon_vma {
- spinlock_t lock; /* Serialize access to vma list */
struct anon_vma *root; /* Root of this anon_vma tree */
+ spinlock_t lock; /* Serialize access to vma list */
#if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
/*

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