>  - changed from u64 to s64

why?

> +/*
> + * For batching....mem_cgroup_charge_statistics()(see below).
> + */
> +static inline void mem_cgroup_stat_add(struct mem_cgroup_stat *stat,
> +                enum mem_cgroup_stat_index idx, int val)
> +{
> +     int cpu = smp_processor_id();
> +     stat->cpustat[cpu].count[idx] += val;
> +}

i think the function name should be something which implies batching.

> @@ -207,8 +299,23 @@ clear_page_cgroup(struct page *page, str
>  }
>  
>  
> -static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
> +static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active,
> +                                 struct mem_cgroup *mem)
>  {

can mem be different from pc->mem_cgroup here?

YAMAMOTO Takashi
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