linux-kernel - Re: [-mm][PATCH 2/4] Enhance cgroup mm_owner_changed callback to add task information

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Date:	Mon, 5 May 2008 16:00:11 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, "Sudhir Kumar" <skumar@...ux.vnet.ibm.com>,
	"YAMAMOTO Takashi" <yamamoto@...inux.co.jp>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org,
	"David Rientjes" <rientjes@...gle.com>,
	"Pavel Emelianov" <xemul@...nvz.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [-mm][PATCH 2/4] Enhance cgroup mm_owner_changed callback to add task information

As Andrew suggested, can you improve the documentation? Ideally, there
should be a paragraph in Documentation/cgroups.txt that describes the
circumstances (including locking state) in which the callback is
called.

Paul

On Sat, May 3, 2008 at 2:38 PM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>
>
>  This patch adds an additional field to the mm_owner callbacks. This field
>  is required to get to the mm that changed.
>
>  Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
>  ---
>
>   include/linux/cgroup.h |    3 ++-
>   kernel/cgroup.c        |    2 +-
>   2 files changed, 3 insertions(+), 2 deletions(-)
>
>  diff -puN kernel/cgroup.c~cgroup-add-task-to-mm--owner-callbacks kernel/cgroup.c
>  --- linux-2.6.25/kernel/cgroup.c~cgroup-add-task-to-mm--owner-callbacks 2008-05-04 02:53:05.000000000 +0530
>  +++ linux-2.6.25-balbir/kernel/cgroup.c 2008-05-04 02:53:05.000000000 +0530
>  @@ -2772,7 +2772,7 @@ void cgroup_mm_owner_callbacks(struct ta
>                         if (oldcgrp == newcgrp)
>                                 continue;
>                         if (ss->mm_owner_changed)
>  -                               ss->mm_owner_changed(ss, oldcgrp, newcgrp);
>  +                               ss->mm_owner_changed(ss, oldcgrp, newcgrp, new);
>                 }
>         }
>   }
>  diff -puN include/linux/cgroup.h~cgroup-add-task-to-mm--owner-callbacks include/linux/cgroup.h
>  --- linux-2.6.25/include/linux/cgroup.h~cgroup-add-task-to-mm--owner-callbacks  2008-05-04 02:53:05.000000000 +0530
>  +++ linux-2.6.25-balbir/include/linux/cgroup.h  2008-05-04 02:53:05.000000000 +0530
>  @@ -310,7 +310,8 @@ struct cgroup_subsys {
>          */
>         void (*mm_owner_changed)(struct cgroup_subsys *ss,
>                                         struct cgroup *old,
>  -                                       struct cgroup *new);
>  +                                       struct cgroup *new,
>  +                                       struct task_struct *p);
>         int subsys_id;
>         int active;
>         int disabled;
>  _
>
>  --
>         Warm Regards,
>         Balbir Singh
>         Linux Technology Center
>         IBM, ISTL
>
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