linux-kernel - Re: [mm] [PATCH 1/4] Memory cgroup hierarchy documentation (v4)

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Date:	Mon, 17 Nov 2008 09:06:29 +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: [mm] [PATCH 1/4] Memory cgroup hierarchy documentation (v4)

> +6.1 Enabling hierarchical accounting and reclaim
> +
> +The memory controller by default disables the hierarchy feature. Support
> +can be enabled by writing 1 to memory.use_hierarchy file of the root cgroup
> +
> +# echo 1 > memory.use_hierarchy
> +
> +The feature can be disabled by
> +
> +# echo 0 > memory.use_hierarchy
> +
> +NOTE1: Enabling/disabling will fail if the cgroup already has other
> +cgroups created below it.
> +

It's better to also document that it will fail if it's parent's use_hierarchy
is already enabled.

> +NOTE2: This feature can be enabled/disabled per subtree.
> +
> +7. TODO
>  
>  1. Add support for accounting huge pages (as a separate controller)
>  2. Make per-cgroup scanner reclaim not-shared pages first
> _
> 
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