linux-kernel - Re: [PATCH 9/13] memcg: lookup page cgroup (and remove pointer from struct page)

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Message-Id: <1222098469.16700.38.camel@lappy.programming.kicks-ass.net>
Date:	Mon, 22 Sep 2008 17:47:49 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 9/13] memcg: lookup page cgroup (and remove pointer
	from struct page)

On Mon, 2008-09-22 at 20:12 +0900, KAMEZAWA Hiroyuki wrote:

>   - all page_cgroup struct is maintained by hash. 
>     I think we have 2 ways to handle sparse index in general
>     ...radix-tree and hash. This uses hash because radix-tree's layout is
>     affected by memory map's layout.

Could you provide further detail? That is, is this solely because our
radix tree implementation is sucky for large indexes?

If so, I did most of the work of fixing that, just need to spend a
little more time to stabalize the code.

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