linux-kernel - Re: [PATCH 5/8] RSS accounting hooks over the code

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Message-ID: <465FC12A.5040708@linux.vnet.ibm.com>
Date:	Fri, 01 Jun 2007 12:18:10 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Pavel Emelianov <xemul@...nvz.org>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org, Kirill Korotaev <dev@...nvz.org>
Subject: Re: [PATCH 5/8] RSS accounting hooks over the code

Andrew Morton wrote:
> On Wed, 30 May 2007 19:34:18 +0400
> Pavel Emelianov <xemul@...nvz.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
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