linux-kernel - Re: a room for blkio-cgroup in struct page

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Message-ID: <661de9470909021302ge86d01s5d107dc2b5cffbc5@mail.gmail.com>
Date:	Thu, 3 Sep 2009 01:32:24 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Ryo Tsuruta <ryov@...inux.co.jp>, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com, linux-mm@...ck.org
Subject: Re: a room for blkio-cgroup in struct page_cgroup

2009/9/2 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>:
> Ryo Tsuruta wrote:
>> Hi Kamezawa-san,
>>
>> As you wrote before (http://lkml.org/lkml/2009/7/22/65)
>>> To be honest, what I expected in these days for people of blockio
>>> cgroup is like following for getting room for themselves.
>> <<snip>>
>>> --- mmotm-2.6.31-Jul16.orig/include/linux/page_cgroup.h
>>> +++ mmotm-2.6.31-Jul16/include/linux/page_cgroup.h
>>> @@ -13,7 +13,7 @@
>>>  struct page_cgroup {
>>>       unsigned long flags;
>>>       struct mem_cgroup *mem_cgroup;
>>> -     struct page *page;
>>> +     /* block io tracking will use extra unsigned long bytes */
>>>       struct list_head lru;       /* per cgroup LRU list */
>>> };
>>
>> Have you already added a room for blkio_cgroup in struct page_cgroup?
> No.
>

The diff above is unclear, are you removing struct page from page_cgroup?

Balbir Singh
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