linux-kernel - Re: [-mm][PATCH 3/4] cgroup mm owner callback changes to add task info (v5)

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Date:	Wed, 21 May 2008 21:19:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, Pavel Emelianov <xemul@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [-mm][PATCH 3/4] cgroup mm owner callback changes to add task
 info (v5)

On Wed, 21 May 2008 20:59:59 +0530 Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> 
> This patch adds an additional field to the mm_owner callbacks. This field
> is required to get to the mm that changed. Hold mmap_sem in write mode
> before calling the mm_owner_changed callback
>
> ...
>
> + * The callbacks are invoked with mmap_sem held in read mode.

Is that true?

> +	down_write(&mm->mmap_sem);
> ...
>  	cgroup_mm_owner_callbacks(mm->owner, c);

Looks like write-mode to me?
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