linux-kernel - Re: [PATCH] memcg: update documentation v5

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Message-ID: <20100413135718.GA4493@redhat.com>
Date:	Tue, 13 Apr 2010 09:57:19 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	KAMEZAWA Hiroyuki <amezawa.hiroyu@...fujitsu.com>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] memcg: update documentation v5

On Tue, Apr 13, 2010 at 01:45:53PM +0900, KAMEZAWA Hiroyuki wrote:

[..]
> -2. Locking
> +2.6 Locking
>  
> -The memory controller uses the following hierarchy
> +   lock_page_cgroup()/unlock_page_cgroup() should not be called under
> +   mapping->tree_lock.
>  

Because I never understood very well, I will ask. Why lock_page_cgroup()
should not be called under mapping->tree_lock?

Thanks
Vivek
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