linux-kernel - Re: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller

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Message-ID: <4EE21D23.4000309@parallels.com>
Date:	Fri, 9 Dec 2011 12:37:23 -0200
From:	Glauber Costa <glommer@...allels.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	<linux-kernel@...r.kernel.org>, <lizf@...fujitsu.com>,
	<ebiederm@...ssion.com>, <davem@...emloft.net>,
	<gthelen@...gle.com>, <netdev@...r.kernel.org>,
	<linux-mm@...ck.org>, <kirill@...temov.name>,
	<avagin@...allels.com>, <devel@...nvz.org>,
	<eric.dumazet@...il.com>, <cgroups@...r.kernel.org>,
	<hannes@...xchg.org>, <mhocko@...e.cz>,
	Paul Menage <paul@...lmenage.org>
Subject: Re: [PATCH v8 1/9] Basic kernel memory functionality for the Memory
 Controller

On 12/08/2011 11:21 PM, KAMEZAWA Hiroyuki wrote:
> Hm, why you check val != parent->kmem_independent_accounting ?
>
> 	if (parent&&  parent->use_hierarchy)
> 		return -EINVAL;
> ?
>
> BTW, you didn't check this cgroup has children or not.
> I think
>
> 	if (this_cgroup->use_hierarchy&&
>               !list_empty(this_cgroup->childlen))
> 		return -EINVAL;

How about this?

         val = !!val;

         /*
          * This follows the same hierarchy restrictions than
          * mem_cgroup_hierarchy_write()
          */
         if (!parent || !parent->use_hierarchy) {
                 if (list_empty(&cgroup->children))
                         memcg->kmem_independent_accounting = val;
                 else
                         return -EBUSY;
         }
         else
                 return -EINVAL;

         return 0;

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