The use of CPU ops here avoids the offset calculations that we used to have to do with per cpu operations. The result of this patch is that event counters are coded with a single instruction the following way: incq %gs:offset(%rip) Without these patches this was: mov %gs:0x8,%rdx mov %eax,0x38(%rsp) mov xxx(%rip),%eax mov %eax,0x48(%rsp) mov varoffset,%rax incq 0x110(%rax,%rdx,1) Signed-off-by: Christoph Lameter --- include/linux/vmstat.h | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) Index: linux-2.6/include/linux/vmstat.h =================================================================== --- linux-2.6.orig/include/linux/vmstat.h 2008-10-23 15:21:52.000000000 -0500 +++ linux-2.6/include/linux/vmstat.h 2008-10-23 15:34:02.000000000 -0500 @@ -75,24 +75,22 @@ static inline void __count_vm_event(enum vm_event_item item) { - __get_cpu_var(vm_event_states).event[item]++; + __CPU_INC(per_cpu_var(vm_event_states).event[item]); } static inline void count_vm_event(enum vm_event_item item) { - get_cpu_var(vm_event_states).event[item]++; - put_cpu(); + _CPU_INC(per_cpu_var(vm_event_states).event[item]); } static inline void __count_vm_events(enum vm_event_item item, long delta) { - __get_cpu_var(vm_event_states).event[item] += delta; + __CPU_ADD(per_cpu_var(vm_event_states).event[item], delta); } static inline void count_vm_events(enum vm_event_item item, long delta) { - get_cpu_var(vm_event_states).event[item] += delta; - put_cpu(); + _CPU_ADD(per_cpu_var(vm_event_states).event[item], delta); } extern void all_vm_events(unsigned long *); -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/