From: Eric Dumazet <dada1@cosmosbay.com>
Date: Thu, 7 Dec 2006 04:38:53 +0000 (-0800)
Subject: [PATCH] fs: reorder some 'struct inode' fields to speedup i_size manipulations
X-Git-Tag: v2.6.20-rc1~145^2^2~107
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=83b7b44e1c1e9e493ccd4146558481ab5af0116a;p=pandora-kernel.git

[PATCH] fs: reorder some 'struct inode' fields to speedup i_size manipulations

On 32bits SMP platforms, 64bits i_size is protected by a seqcount
(i_size_seqcount).

When i_size is read or written, i_size_seqcount is read/written as well, so
it make sense to group these two fields together in the same cache line.

This patch moves i_size_seqcount next to i_size, and also moves i_version
to let offsetof(struct inode, i_size) being 0x40 instead of 0x3c (for
32bits platforms).

For 64 bits platforms, i_size_seqcount doesnt exist, and the move of a
'long i_version' should not introduce a new hole because of padding.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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