linux-kernel - Re: [RFC] [PATCH 8/9] memcg: remove page

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Date:	Fri, 12 Sep 2008 09:23:13 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	"hugh@...itas.com" <hugh@...itas.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, menage@...gle.com,
	Dave Hansen <haveblue@...ibm.com>
Subject: Re: [RFC] [PATCH 8/9] memcg: remove page_cgroup pointer from memmap

On Fri, 2008-09-12 at 09:19 -0700, Dave Hansen wrote:
> On Fri, 2008-09-12 at 09:12 -0700, Balbir Singh wrote:
> > 3. Integrate with sparsemem (last resort for performance), Dave Hansen suggested
> > adding a mem_section member and using that.
> 
> I also suggested using the sparsemem *structure* without necessarily
> using it for pfn_to_page() lookups.  That'll take some rework to
> separate out SPARSEMEM_FOR_MEMMAP vs. CONFIG_SPARSE_STRUCTURE_FUN, but
> it should be able to be prototyped pretty fast.

Heh, now that I think about it, you could also use vmemmap to do the
same thing.

-- Dave

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