From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: + mm-remove-alignment-padding-from-anon_vma-on-some-64-bit-builds.patch added to -mm tree Date: Thu, 23 Sep 2010 16:24:39 -0700 Message-ID: <201009232324.o8NNOdaM025506@imap1.linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:48926 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753413Ab0IWX0C (ORCPT ); Thu, 23 Sep 2010 19:26:02 -0400 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: mm-commits@vger.kernel.org Cc: richard@rsk.demon.co.uk, riel@redhat.com 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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: mm: remove alignment padding from anon_vma on (some) 64 bit builds From: Richard Kennedy 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 Reviewed-by: Rik van Riel Signed-off-by: Andrew Morton --- 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@rsk.demon.co.uk 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