linux-kernel - Re: [RFC][mm] [PATCH 3/4] Memory cgroup hierarchical reclaim (v3)

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Message-Id: <20081112125204.a92816cc.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 12 Nov 2008 12:52:04 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...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>, lizf@...fujitsu.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>
Subject: Re: [RFC][mm] [PATCH 3/4] Memory cgroup hierarchical reclaim (v3)

On Tue, 11 Nov 2008 18:04:17 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> +
> +		/*
> +		 * We need to give up the cgroup lock if it is held, since
> +		 * it creates the potential for deadlock. cgroup_mutex should
> +		 * be acquired after cpu_hotplug lock. In this path, we
> +		 * acquire the cpu_hotplug lock after acquiring the cgroup_mutex
> +		 * Giving it up should be OK
> +		 */
> +		if (cgroup_locked)
> +			cgroup_unlock();

nice catch. I'll post a fix to this as its own patch. 

Thanks,
-Kame


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