Commit 4cef0c61 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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[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: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent fd78f117

kernel/sched.c

+3 −3
Original line number Diff line number Diff line
@@ -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)