linux-kernel - Re: [RFC][mm] [PATCH 4/4] Memory cgroup hierarchy feature selector (v3)

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Date:	Thu, 13 Nov 2008 09:39:09 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
CC:	linux-mm@...ck.org, YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][mm] [PATCH 4/4] Memory cgroup hierarchy feature selector
 (v3)

> @@ -137,6 +137,11 @@ struct mem_cgroup {
>  	 * reclaimed from. Protected by cgroup_lock()
>  	 */
>  	struct mem_cgroup *last_scanned_child;
> +	/*
> +	 * Should the accounting and control be hierarchical, per subtree?
> +	 */
> +	unsigned long use_hierarchy;
> +

A minor comment, 'unsigned int' is sufficient, then we save 4 bytes
per mem_cgroup on 64 bits machines.

>  };

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