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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: Pekka Enberg <penberg@kernel.org> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -227,9 +227,7 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
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s8 __percpu *p = pcp->vm_stat_diff + item;
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s8 v, t;
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__this_cpu_inc(*p);
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v = __this_cpu_read(*p);
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v = __this_cpu_inc_return(*p);
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t = __this_cpu_read(pcp->stat_threshold);
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if (unlikely(v > t)) {
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s8 overstep = t >> 1;
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@ -251,9 +249,7 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
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s8 __percpu *p = pcp->vm_stat_diff + item;
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s8 v, t;
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__this_cpu_dec(*p);
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v = __this_cpu_read(*p);
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v = __this_cpu_dec_return(*p);
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t = __this_cpu_read(pcp->stat_threshold);
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if (unlikely(v < - t)) {
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s8 overstep = t >> 1;
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