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

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Message-ID: <84144f020804010900s5335988ai58546874a6a2f8bd@mail.gmail.com>
Date:	Tue, 1 Apr 2008 19:00:03 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
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)

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.
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