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Date: Fri, 01 Jun 2007 12:18:10 +0530
From: Balbir Singh <balbir@linux.vnet.ibm.com>
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To: Andrew Morton <akpm@linux-foundation.org>
CC: Pavel Emelianov <xemul@openvz.org>, Paul Menage <menage@google.com>,
       Balbir Singh <balbir@in.ibm.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       devel@openvz.org, Kirill Korotaev <dev@openvz.org>
Subject: Re: [PATCH 5/8] RSS accounting hooks over the code
References: <465D9739.8070209@openvz.org> <465D997A.3030706@openvz.org> <20070530144629.09dad0df.akpm@linux-foundation.org>
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Andrew Morton wrote:
> On Wed, 30 May 2007 19:34:18 +0400
> Pavel Emelianov <xemul@openvz.org> wrote:
> 
>> As described above, pages are charged to their first touchers.
>> The first toucher is determined using pages' _mapcount 
>> manipulations in rmap calls.
>>
>> Page is charged in two stages:
>> 1. preparation, in which the resource availability is checked.
>>    This stage may lead to page reclamation, thus it is performed
>>    in a "might-sleep" places;
>> 2. the container assignment to page. This is done in an atomic
>>    code that handles races between multiple touchers.
> 
> I suppose we need to think about what to do about higher-order pages, and
> compound pages, and hugetlb memory.

Yes, that needs to be done eventually. I feel that support can be added
incrementally once we have a stable controller.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL