commit ba89966c1984513f4f2cc0a6c182266be44ddd03
author Eric Dumazet <dada1@cosmosbay.com> Fri Aug 26 12:05:31 2005 -0700
committer David S. Miller <davem@sunset.davemloft.net> Mon Aug 29 16:11:18 2005 -0700
tree 6e5766fc5c287708c03e0a162531dfd4785b0703
parent 29cb9f9c5502f6218cd3ea574efe46a5e55522d2

[NET]: use __read_mostly on kmem_cache_t , DEFINE_SNMP_STAT pointers

This patch puts mostly read only data in the right section
(read_mostly), to help sharing of these data between CPUS without
memory ping pongs.

On one of my production machine, tcp_statistics was sitting in a
heavily modified cache line, so *every* SNMP update had to force a
reload.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/fib_hash.c

diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index b10d6bb..2a8c9af 100644
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -45,8 +45,8 @@
 
 #include "fib_lookup.h"
 
-static kmem_cache_t *fn_hash_kmem;
-static kmem_cache_t *fn_alias_kmem;
+static kmem_cache_t *fn_hash_kmem __read_mostly;
+static kmem_cache_t *fn_alias_kmem __read_mostly;
 
 struct fib_node {
 	struct hlist_node	fn_hash;