The patch titled
mm: remove alignment padding from anon_vma on (some) 64 bit builds
has been added to the -mm tree. Its filename is
mm-remove-alignment-padding-from-anon_vma-on-some-64-bit-builds.patch
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------------------------------------------------------
Subject: mm: remove alignment padding from anon_vma on (some) 64 bit builds
From: Richard Kennedy <richard@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/rmap.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/rmap.h~mm-remove-alignment-padding-from-anon_vma-on-some-64-bit-builds include/linux/rmap.h
--- a/include/linux/rmap.h~mm-remove-alignment-padding-from-anon_vma-on-some-64-bit-builds
+++ a/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)
/*
_
Patches currently in -mm which might be from richard@xxxxxxxxxxxxxxx are
linux-next.patch
timer_list-remove-alignment-padding-on-64-bit-when-config_timer_stats.patch
mm-remove-alignment-padding-from-anon_vma-on-some-64-bit-builds.patch
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