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

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Message-Id: <20070530144629.09dad0df.akpm@linux-foundation.org>
Date:	Wed, 30 May 2007 14:46:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pavel Emelianov <xemul@...nvz.org>
Cc:	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

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.
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