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authorYing Xue <ying.xue@windriver.com>2012-08-16 16:09:12 +0400
committerDavid S. Miller <davem@davemloft.net>2012-08-20 13:26:31 +0400
commit61cdd4d80b29cfdee45920238eea2d1fbb51f922 (patch)
tree44df7d9694b581afae71955030ffbad25a4aee15 /net/tipc
parentf046e7d9be1cbb3335694c7f9a31d18e1f998ff5 (diff)
downloadlinux-61cdd4d80b29cfdee45920238eea2d1fbb51f922.tar.xz
tipc: add __read_mostly annotations to several global variables
Added to the following: - tipc_random - tipc_own_addr - tipc_max_ports - tipc_net_id - tipc_remote_management - handler_enabled The above global variables are read often, but written rarely. Use __read_mostly to prevent them being on the same cacheline as another variable which is written to often, which would cause cacheline bouncing. Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/core.c10
-rw-r--r--net/tipc/core.h10
-rw-r--r--net/tipc/handler.c2
3 files changed, 11 insertions, 11 deletions
diff --git a/net/tipc/core.c b/net/tipc/core.c
index daae7f74d418..b858f2003523 100644
--- a/net/tipc/core.c
+++ b/net/tipc/core.c
@@ -48,15 +48,15 @@
/* global variables used by multiple sub-systems within TIPC */
-int tipc_random;
+int tipc_random __read_mostly;
/* configurable TIPC parameters */
-u32 tipc_own_addr;
-int tipc_max_ports;
+u32 tipc_own_addr __read_mostly;
+int tipc_max_ports __read_mostly;
int tipc_max_subscriptions;
int tipc_max_publications;
-int tipc_net_id;
-int tipc_remote_management;
+int tipc_net_id __read_mostly;
+int tipc_remote_management __read_mostly;
/**
diff --git a/net/tipc/core.h b/net/tipc/core.h
index e4e46cd2d0e6..4c5705ac8a5a 100644
--- a/net/tipc/core.h
+++ b/net/tipc/core.h
@@ -74,17 +74,17 @@ int tipc_snprintf(char *buf, int len, const char *fmt, ...);
/*
* Global configuration variables
*/
-extern u32 tipc_own_addr;
-extern int tipc_max_ports;
+extern u32 tipc_own_addr __read_mostly;
+extern int tipc_max_ports __read_mostly;
extern int tipc_max_subscriptions;
extern int tipc_max_publications;
-extern int tipc_net_id;
-extern int tipc_remote_management;
+extern int tipc_net_id __read_mostly;
+extern int tipc_remote_management __read_mostly;
/*
* Other global variables
*/
-extern int tipc_random;
+extern int tipc_random __read_mostly;
/*
* Routines available to privileged subsystems
diff --git a/net/tipc/handler.c b/net/tipc/handler.c
index 7a52d3922f3c..111ff8300ae5 100644
--- a/net/tipc/handler.c
+++ b/net/tipc/handler.c
@@ -45,7 +45,7 @@ struct queue_item {
static struct kmem_cache *tipc_queue_item_cache;
static struct list_head signal_queue_head;
static DEFINE_SPINLOCK(qitem_lock);
-static int handler_enabled;
+static int handler_enabled __read_mostly;
static void process_signal_queue(unsigned long dummy);