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

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Date:	Thu, 3 Apr 2008 08:45:33 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Balbir Singh" <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: [-mm] Add an owner to the mm_struct (v6)

On Thu, Apr 3, 2008 at 12:30 AM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>  +         This option enables mm_struct's to have an owner. The advantage
>  +         of this approach is that it allows for several independent memory
>  +         based cgorup controllers to co-exist independently without too

cgorup -> cgroup

>  +       if (need_mm_owner_callback) {
>  +               int i;
>  +               for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
>  +                       struct cgroup_subsys *ss = subsys[i];
>  +                       oldcgrp = task_cgroup(old, ss->subsys_id);
>  +                       newcgrp = task_cgroup(new, ss->subsys_id);
>  +                       if (oldcgrp == newcgrp)
>  +                               continue;
>  +                       if (ss->mm_owner_changed)
>  +                               ss->mm_owner_changed(ss, oldcgrp, newcgrp);

Even better, maybe just pass in the relevant cgroup_subsys_state
objects here, rather than the cgroup objects?

>
>         css_get(&mem->css);
>  -       rcu_assign_pointer(mm->mem_cgroup, mem);
>         css_put(&old_mem->css);

These get/put calls are now unwanted?

Could you also add comments in mm_need_new_owner(), in particular the
reason for checking for delay_group_leader() ?

Paul
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