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Date: Tue, 1 Apr 2008 19:00:03 +0300
From: "Pekka Enberg" <penberg@cs.helsinki.fi>
To: "Balbir Singh" <balbir@linux.vnet.ibm.com>
Subject: Re: [RFC][-mm] Add an owner to the mm_struct (v4)
Cc: "Paul Menage" <menage@google.com>, "Pavel Emelianov" <xemul@openvz.org>,
       "Hugh Dickins" <hugh@veritas.com>,
       "Sudhir Kumar" <skumar@linux.vnet.ibm.com>,
       "YAMAMOTO Takashi" <yamamoto@valinux.co.jp>, lizf@cn.fujitsu.com,
       linux-kernel@vger.kernel.org, taka@valinux.co.jp, linux-mm@kvack.org,
       "David Rientjes" <rientjes@google.com>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>
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Hi,

On Tue, Apr 1, 2008 at 3:43 PM, Balbir Singh <balbir@linux.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.