From: Rik van Riel <riel@redhat.com>
To: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: remove alignment padding from anon_vma on (some) 64 bit builds
Date: Sat, 28 Aug 2010 11:57:02 -0400 [thread overview]
Message-ID: <4C7931CE.4050506@redhat.com> (raw)
In-Reply-To: <1283004586.1912.10.camel@castor.rsk>
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@rsk.demon.co.uk>
Reviewed-by: Rik van Riel <riel@redhat.com>
--
All rights reversed
WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: remove alignment padding from anon_vma on (some) 64 bit builds
Date: Sat, 28 Aug 2010 11:57:02 -0400 [thread overview]
Message-ID: <4C7931CE.4050506@redhat.com> (raw)
In-Reply-To: <1283004586.1912.10.camel@castor.rsk>
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@rsk.demon.co.uk>
Reviewed-by: Rik van Riel <riel@redhat.com>
--
All rights reversed
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next prev parent reply other threads:[~2010-08-28 15:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-28 14:09 [PATCH] mm: remove alignment padding from anon_vma on (some) 64 bit builds Richard Kennedy
2010-08-28 14:09 ` Richard Kennedy
2010-08-28 15:57 ` Rik van Riel [this message]
2010-08-28 15:57 ` Rik van Riel
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