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

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Message-Id: <20080328194839.fe6ffa52.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 28 Mar 2008 19:48:39 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Paul Menage <menage@...gle.com>,
	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>
Subject: Re: [-mm] Add an owner to the mm_struct (v2)

On Fri, 28 Mar 2008 13:53:16 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> 
> 
> 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.
> 
> The code initially assigns mm->owner to the task and then after the
> thread group leader is identified. The mm->owner is changed to the thread
> group leader of the task later at the end of copy_process.
> 
Hmm, I like this approach. 

-a bit off topic-
BTW, could you move mem_cgroup_from_task() to include/linux/memcontrol.h ?

Then, I'll add an interface like
mem_cgroup_charge_xxx(struct page *page, struct mem_cgroup *mem, gfp_mask mask)

This can be called in following way:
mem_cgroup_charge_xxx(page, mem_cgroup_from_task(current), GFP_XXX);
and I don't have to access mm_struct's member in this case.

Thanks,
-Kame

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