linux-kernel - Re: [PATCH RFC] mm/memcg: calculate max hierarchy limit number instead of min

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Date:	Thu, 19 Jul 2012 15:07:20 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Wanpeng Li <liwp.linux@...il.com>
CC:	linux-mm@...ck.org, Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] mm/memcg: calculate max hierarchy limit number instead
 of min

(2012/07/11 22:24), Wanpeng Li wrote:
> From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
> 
> Since hierachical_memory_limit shows "of bytes of memory limit with
> regard to hierarchy under which the memory cgroup is", the count should
> calculate max hierarchy limit when use_hierarchy in order to show hierarchy
> subtree limit. hierachical_memsw_limit is the same case.
> 
> Signed-off-by: Wanpeng Li <liwp.linux@...il.com>

Hm ? What is the hierarchical limit for 'C' in following tree ?

A  ---  limit=1G 
 \
  B --  limit=500M
   \
    C - unlimtied

Thanks,
-Kame


> ---
>   mm/memcontrol.c |   14 +++++++-------
>   1 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 69a7d45..6392c0a 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3929,10 +3929,10 @@ static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
>   		unsigned long long *mem_limit, unsigned long long *memsw_limit)
>   {
>   	struct cgroup *cgroup;
> -	unsigned long long min_limit, min_memsw_limit, tmp;
> +	unsigned long long max_limit, max_memsw_limit, tmp;
>   
> -	min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
> -	min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
> +	max_limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
> +	max_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
>   	cgroup = memcg->css.cgroup;
>   	if (!memcg->use_hierarchy)
>   		goto out;
> @@ -3943,13 +3943,13 @@ static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
>   		if (!memcg->use_hierarchy)
>   			break;
>   		tmp = res_counter_read_u64(&memcg->res, RES_LIMIT);
> -		min_limit = min(min_limit, tmp);
> +		max_limit = max(max_limit, tmp);
>   		tmp = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
> -		min_memsw_limit = min(min_memsw_limit, tmp);
> +		max_memsw_limit = max(max_memsw_limit, tmp);
>   	}
>   out:
> -	*mem_limit = min_limit;
> -	*memsw_limit = min_memsw_limit;
> +	*mem_limit = max_limit;
> +	*memsw_limit = max_memsw_limit;
>   }
>   
>   static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
> 



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