> @@ -39,6 +39,18 @@ struct res_counter {
>  	 */
>  	unsigned long long failcnt;
>  	/*
> +	 * the amount of resource comes from parenet cgroup. Should be
> +	 * returned to the parent at destroying/resizing this res_counter.
> +	 */
> +	unsigned long long borrow;

why do you need this in addition to the limit?
ie. aren't their values always equal except the root cgroup?

YAMAMOTO Takashi
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