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

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Message-ID: <47F3D62E.4070808@linux.vnet.ibm.com>
Date:	Thu, 03 Apr 2008 00:23:34 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Menage <menage@...gle.com>, Pavel Emelianov <xemul@...nvz.org>
CC:	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)

Balbir Singh wrote:
> Changelog v3
> ------------
> 
> 1. Add mm->owner change callbacks using cgroups
> 
> This patch removes the mem_cgroup member from mm_struct and instead adds
> an owner. This approach was suggested by Paul Menage. The advantage of
> this approach is that, once the mm->owner is known, using the subsystem
> id, the cgroup can be determined. It also allows several control groups
> that are virtually grouped by mm_struct, to exist independent of the memory
> controller i.e., without adding mem_cgroup's for each controller,
> to mm_struct.
> 
> A new config option CONFIG_MM_OWNER is added and the memory resource
> controller selects this config option.
> 
> NOTE: This patch was developed on top of 2.6.25-rc5-mm1 and is applied on top
> of the memory-controller-move-to-own-slab patch (which is already present
> in the Andrew's patchset).
> 
> This patch also adds cgroup callbacks to notify subsystems when mm->owner
> changes. The mm_cgroup_changed callback is called with the task_lock()
> of the new task held and is called just prior to changing the mm->owner.
> 
> I am indebted to Paul Menage for the several reviews of this patchset
> and helping me make it lighter and simpler.
> 
> This patch was tested on a powerpc box.
> 
> Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>

Hi,

So far I've heard no objections or seen any review suggestions. Paul if you are
OK with this patch, I'll ask Andrew to include it in -mm.

People waiting on this patch

1. Pekka Enberg for revoke* syscalls
2. Serge Hallyn for swap namespaces
3. Myself to implement the rlimit controller for cgroups

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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