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authorAndi Kleen <ak@suse.de>2006-01-11 22:44:57 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:04:56 -0800
commit4cef0c61380888af99b054937ed391fb28757836 (patch)
treedd385a0dc1ab143285f77e0f5c1923490eddc26f
parentfd78f11790c37e2165733699f50450500e63a7b3 (diff)
[PATCH] x86_64: Make the cpu_*_maps in kernel/sched.c read mostly
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>
-rw-r--r--kernel/sched.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index d129e560cc0..c0c60c926d5 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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)