From: Eric Dumazet <dada1@cosmosbay.com>
Date: Sun, 26 Mar 2006 09:37:24 +0000 (-0800)
Subject: [PATCH] Use __read_mostly on some hot fs variables
X-Git-Tag: v2.6.17-rc1~633
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fa3536cc144c1298f2ed9416c33f3b77fa2cd37a;p=pandora-kernel.git

[PATCH] Use __read_mostly on some hot fs variables

I discovered on oprofile hunting on a SMP platform that dentry lookups were
slowed down because d_hash_mask, d_hash_shift and dentry_hashtable were in
a cache line that contained inodes_stat.  So each time inodes_stats is
changed by a cpu, other cpus have to refill their cache line.

This patch moves some variables to the __read_mostly section, in order to
avoid false sharing.  RCU dentry lookups can go full speed.

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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