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Commit 908ee0f1 authored by Christoph Lameter's avatar Christoph Lameter Committed by Tejun Heo
Browse files

vmstat: Use this_cpu_inc_return for vm statistics 



this_cpu_inc_return() saves us a memory access there. Code
size does not change.

V1->V2:
	- Fixed the location of the __per_cpu pointer attributes
	- Sparse checked
V2->V3:
	- Move fixes to __percpu attribute usage to earlier patch

Reviewed-by: default avatarPekka Enberg <penberg@kernel.org>
Acked-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 275c8b93

mm/vmstat.c

+2 −6
Original line number Diff line number Diff line
@@ -227,9 +227,7 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item) 
	s8 __percpu *p = pcp->vm_stat_diff + item;

	s8 v, t;



	__this_cpu_inc(*p);



	v = __this_cpu_read(*p);

	v = __this_cpu_inc_return(*p);

	t = __this_cpu_read(pcp->stat_threshold);

	if (unlikely(v > t)) {

		s8 overstep = t >> 1;
@@ -251,9 +249,7 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item) 
	s8 __percpu *p = pcp->vm_stat_diff + item;

	s8 v, t;



	__this_cpu_dec(*p);



	v = __this_cpu_read(*p);

	v = __this_cpu_dec_return(*p);

	t = __this_cpu_read(pcp->stat_threshold);

	if (unlikely(v < - t)) {

		s8 overstep = t >> 1;