Re: [RFC][mm] [PATCH 4/4] Memory cgroup hierarchy feature selector(v3)

[Li Zefan]

> @@ -137,6 +137,11 @@ struct mem_cgroup {
>  	 * reclaimed from. Protected by cgroup_lock()
>  	 */
>  	struct mem_cgroup *last_scanned_child;
> +	/*
> +	 * Should the accounting and control be hierarchical, per subtree?
> +	 */
> +	unsigned long use_hierarchy;
> +

A minor comment, 'unsigned int' is sufficient, then we save 4 bytes
per mem_cgroup on 64 bits machines.

>  };

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