> +
> +/*
> + * Per-zone statistics.
> + * Please be carefull. The array can be very big on envrionments whic has
> + * very big MAX_NUMNODES . Adding new stat member to this will eat much memory.
> + * Only Active/Inactive may be sutiable.

s/whic/&h/
s/sutiable/suitable/

> +static inline void __mem_cgroup_zonesta_dec(struct mem_cgroup_zonestat *zstat,

s/zonesta/&t/

> @@ -293,6 +369,23 @@ clear_page_cgroup(struct page *page, str
>  
>  static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
>  {
> +	int direction = 0;
> +
> +	if (active && !(pc->flags & PAGE_CGROUP_FLAG_ACTIVE))
> +		direction = 1; /*from inactive to acvive */
> +	if (!active && (pc->flags & PAGE_CGROUP_FLAG_ACTIVE))
> +		direction = -1;
> +
> +	if (direction) {
> +		struct mem_cgroup_zonestat *zstat = &pc->mem_cgroup->zonestat;
> +		int index = page_cgroup_to_zonestat_index(pc);
> +		preempt_disable();
> +		__mem_cgroup_zonestat_add(zstat, MEM_CGROUP_ZONESTAT_ACTIVE,
> +			direction, index);
> +		__mem_cgroup_zonestat_add(zstat, MEM_CGROUP_ZONESTAT_INACTIVE,
> +			direction, index);

dec?

YAMAMOTO Takashi
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