From ba89966c1984513f4f2cc0a6c182266be44ddd03 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <dada1@cosmosbay.com>
Date: Fri, 26 Aug 2005 12:05:31 -0700
Subject: [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/dccp/ccids/ccid3.c | 2 +-
 net/dccp/proto.c       | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

(limited to 'net/dccp')

diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index fe4cc85..cf93b01 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -85,7 +85,7 @@ static int ccid3_debug;
 static struct dccp_tx_hist *ccid3_tx_hist;
 static struct dccp_rx_hist *ccid3_rx_hist;
 
-static kmem_cache_t *ccid3_loss_interval_hist_slab;
+static kmem_cache_t *ccid3_loss_interval_hist_slab __read_mostly;
 
 static inline struct ccid3_loss_interval_hist_entry *
 	ccid3_loss_interval_hist_entry_new(const unsigned int __nocast prio)
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 600dda5..f97e92e 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -39,7 +39,7 @@
 #include "ccid.h"
 #include "dccp.h"
 
-DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics);
+DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
 
 atomic_t dccp_orphan_count = ATOMIC_INIT(0);
 
-- 
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