linux-kernel - Re: [RFC][PATCH] Remove cgroup member from struct page (v3)

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Message-Id: <20080918.151326.98179387.taka@valinux.co.jp>
Date:	Thu, 18 Sep 2008 15:13:26 +0900 (JST)
From:	Hirokazu Takahashi <taka@...inux.co.jp>
To:	kamezawa.hiroyu@...fujitsu.com
Cc:	akpm@...ux-foundation.org, balbir@...ux.vnet.ibm.com,
	dave@...ux.vnet.ibm.com, nickpiggin@...oo.com.au, hugh@...itas.com,
	menage@...gle.com, xemul@...nvz.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC][PATCH] Remove cgroup member from struct page (v3)

Hello,

> > But I think each memory model type should have its own way of managing
> > its page_cgroup arrays as doing for its struct page arrays.
> > It would be better rather than the sparsemem approach he said.
> > 
> My patch adds an interface. Then...
> FLATMEM support will be very easy.

Yes, that is true, it is really easy.

> I'll ignore DISCONTIGMEM and SPARSEMEM (they will use my 'hash')

What part of this do you think is the problem to implement it in the
straight way for this model?
I think it won't be difficult to implement it since each pgdat can have
its page_cgroup array, which can care about holes in the node as well as
doing it for its struct page array.

> SPARSEMEM_VMEMMAP support will took some amount of time. It will need
> per-arch patches.

Yes, each of ia64, powerpc and x86_64 use this memory model.

We should also care about the regular SPARSEMEM case as you mentioned.

> Thanks,
> -Kame

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