Re: [PATCH][mmotm] Help Root Memory Cgroup Resource Counters Scale Better (v5)

[Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>]

> @@ -1855,9 +1883,14 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
>  		break;
>  	}
>  
> -	res_counter_uncharge(&mem->res, PAGE_SIZE, &soft_limit_excess);
> -	if (do_swap_account && (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT))
> -		res_counter_uncharge(&mem->memsw, PAGE_SIZE, NULL);
> +	if (!mem_cgroup_is_root(mem)) {
> +		res_counter_uncharge(&mem->res, PAGE_SIZE, &soft_limit_excess);
> +		if (do_swap_account &&
> +				(ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT))
> +			res_counter_uncharge(&mem->memsw, PAGE_SIZE, NULL);
> +	}
> +	if (ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT && mem_cgroup_is_root(mem))
> +		mem_cgroup_swap_statistics(mem, true);
Hmm, if we don't count MEM_CGROUP_STAT_SWAPOUT properly about other groups than the root,
memsw.usage_in_bytes of the root would be incorrect in use_hierarchy==1 case, right?

>  	mem_cgroup_charge_statistics(mem, pc, false);
>  
>  	ClearPageCgroupUsed(pc);

Thanks,
Daisuke Nishimura.

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