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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>
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@ -25,8 +25,8 @@
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* pointing to this anon_vma once its vma list is empty.
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* pointing to this anon_vma once its vma list is empty.
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*/
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*/
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struct anon_vma {
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struct anon_vma {
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spinlock_t lock; /* Serialize access to vma list */
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struct anon_vma *root; /* Root of this anon_vma tree */
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struct anon_vma *root; /* Root of this anon_vma tree */
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spinlock_t lock; /* Serialize access to vma list */
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#if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
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#if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
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/*
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/*
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