linux-kernel - Re: [RFC][-mm] Add an owner to the mm

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Message-ID: <47F25F8D.7080102@linux.vnet.ibm.com>
Date:	Tue, 01 Apr 2008 21:45:09 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	Paul Menage <menage@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	linux-mm@...ck.org, David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][-mm] Add an owner to the mm_struct (v4)

Pekka Enberg wrote:
> Hi,
> 
> On Tue, Apr 1, 2008 at 3:43 PM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>>  @@ -227,8 +227,9 @@ struct mm_struct {
>>         /* aio bits */
>>         rwlock_t                ioctx_list_lock;
>>         struct kioctx           *ioctx_list;
>>  -#ifdef CONFIG_CGROUP_MEM_RES_CTLR
>>  -       struct mem_cgroup *mem_cgroup;
>>  +#ifdef CONFIG_MM_OWNER
>>  +       struct task_struct *owner;      /* The thread group leader that */
>>  +                                       /* owns the mm_struct.          */
>>   #endif
> 
> Yes, please. This is useful for the revokeat() patches as well. I
> currently need a big ugly loop to scan each task so I can break COW of
> private pages.

Hi, Pekka,

It's good to know that this will be useful. I think understand your use case of
having to walk the entire tasklist to break COW of private pages, having the
owner information right in the mm_struct is definitely useful.


-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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