> > @@ -245,6 +261,11 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
> > struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset);
> > s8 *p = pcp->vm_stat_diff + item;
> >
> > + if (unlikely(!vm_stat_drift_take(zone, item))) {
> > + zone_page_state_add(-1, zone, item);
> > + return;
> > + }
> > +
> > (*p)--;
> >
> > if (unlikely(*p < - pcp->stat_threshold)) {
>
> Increased overhead for basic VM counter management.
>
> Instead of all of this why not simply set the stat_threshold to 0 for
> select cpus?
hmm... difficult. but I will think this way a while ;)
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