[PATCH] x86_64: Make the cpu_*_maps in kernel/sched.c read mostly
authorAndi Kleen <ak@suse.de>
Wed, 11 Jan 2006 21:44:57 +0000 (22:44 +0100)
committerLinus Torvalds <torvalds@g5.osdl.org>
Thu, 12 Jan 2006 03:04:56 +0000 (19:04 -0800)
They are referred to often so avoid potential false sharing for them.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
kernel/sched.c

index d129e560cc0db55108b31a8e43c000d045ecf8be..c0c60c926d5eafe1ebd57a0f298324933cb46507 100644 (file)
@@ -3980,12 +3980,12 @@ asmlinkage long sys_sched_setaffinity(pid_t pid, unsigned int len,
  * method, such as ACPI for e.g.
  */
 
-cpumask_t cpu_present_map;
+cpumask_t cpu_present_map __read_mostly;
 EXPORT_SYMBOL(cpu_present_map);
 
 #ifndef CONFIG_SMP
-cpumask_t cpu_online_map = CPU_MASK_ALL;
-cpumask_t cpu_possible_map = CPU_MASK_ALL;
+cpumask_t cpu_online_map __read_mostly = CPU_MASK_ALL;
+cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL;
 #endif
 
 long sched_getaffinity(pid_t pid, cpumask_t *mask)