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

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Date:	Tue, 23 Sep 2008 02:34:46 +0900 (JST)
From:	kamezawa.hiroyu@...fujitsu.com
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	kamezawa.hiroyu@...fujitsu.com, linux-mm@...ck.org,
	balbir@...ux.vnet.ibm.com, nishimura@....nes.nec.co.jp,
	xemul@...nvz.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Re: Re: Re: [PATCH 9/13] memcg: lookup page cgroup (and remove pointer from struct page)

>On Tue, 2008-09-23 at 00:57 +0900, kamezawa.hiroyu@...fujitsu.com wrote:
>> I'll add FLATMEM/SPARSEMEM support later. Could you wait for a while ?
>> Because we have lookup_page_cgroup() after this, we can do anything.
>
>OK, I'll stop harassing for the moment, and take a look at the cache. :)
>
Why I don't say "optimize this! now! more!" is where this is called is
limited now. only at charge/uncharge. This is not memmap.

 charge     ...the first page fault to the page
                  add to radix-tree
 uncharge   ...the last unmap aginst the page
                  remove from radix-tree.

I can make this faster by using charactoristics of FLATMEM and others.
(with more #ifdefs and codes.)
But would like to start from generic one because adding interface is
the first thing I have to do here.

BTW, to be honest, I don't like 2-level-table-lookup like
SPARSEMEM_EXTREME, here. A style like SPARSEMEM_VMEMMAP...using 
linear virtual address map will be goal of mine.

Thanks,
-Kame
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