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Message-ID: <6599ad830803312348u3ee4d815i2e24c130978f8e04@mail.gmail.com>
Date: Mon, 31 Mar 2008 23:48:00 -0700
From: "Paul Menage" <menage@google.com>
To: balbir@linux.vnet.ibm.com
Subject: Re: [RFC][-mm] Add an owner to the mm_struct (v3)
Cc: "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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On Mon, Mar 31, 2008 at 11:23 PM, Balbir Singh
<balbir@linux.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