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

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Date:	Fri, 9 Dec 2011 14:44:45 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Glauber Costa" <glommer@...allels.com>,
	"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

 
> 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;

Inverting the tests gives easier to read code:

	if (parent && parent->user_hierarchy)
		return -EINVAL;
	if (!list_empty(&cgroup->children))
		return -EBUSY;
	memcg->kmem_independent_accounting = val != 0;
	return 0;

NFI about the logic...
On the face of it the tests don't seem related to each other
or to the assignment!

	David

	


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