Re: [PATCH] mm: remove alignment padding from anon_vma on (some)64 bit builds

[Rik van Riel]

On 08/28/2010 10:09 AM, Richard Kennedy wrote:
> 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.)
>
> compiled&  tested on x86_64 using SLUB
>
> Signed-off-by: Richard Kennedy<richard@xxxxxxxxxxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>

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