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

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Date:	Mon, 12 Dec 2011 09:34:48 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.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 Fri, 9 Dec 2011 12:37:23 -0200
Glauber Costa <glommer@...allels.com> wrote:

> 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;
> 
seems good to me.

Thanks,
-Kame

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