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

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Message-ID: <6599ad830803312348u3ee4d815i2e24c130978f8e04@mail.gmail.com>
Date:	Mon, 31 Mar 2008 23:48:00 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"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 (v3)

On Mon, Mar 31, 2008 at 11:23 PM, Balbir Singh
<balbir@...ux.vnet.ibm.com> wrote:
>  > Here we'll want to call vm_cgroup_update_mm_owner(), to adjust the
>  > accounting. (Or if in future we end up with more than a couple of
>  > subsystems that want notification at this time, we'll want to call
>  > cgroup_update_mm_owner() and have it call any interested subsystems.
>  >
>
>  I don't think we need to adjust accounting, since only mm->owner is changing and
>  not the cgroup to which the task/mm belongs. Do we really need to notify? I
>  don't want to do any notifications under task_lock().

It's possible but unlikely that the new owner is in a different cgroup.

Paul
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