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Commit 61cdd4d8 authored by Ying Xue's avatar Ying Xue Committed by David S. Miller
Browse files

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: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f046e7d9

net/tipc/core.c

+5 −5
Original line number Diff line number Diff line
@@ -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;





/**

net/tipc/core.h

+5 −5
Original line number Diff line number Diff line
@@ -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

net/tipc/handler.c

+1 −1
Original line number Diff line number Diff line
@@ -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);