linux-kernel - Re: [PATCH 06/10] ksm: identify PageKsm pages

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Message-ID: <4A64B820.3090009@redhat.com>
Date:	Mon, 20 Jul 2009 14:32:00 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Izik Eidus <ieidus@...hat.com>
CC:	akpm@...ux-foundation.org, hugh.dickins@...cali.co.uk,
	aarcange@...hat.com, chrisw@...hat.com, avi@...hat.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	nickpiggin@...oo.com.au, Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH 06/10] ksm: identify PageKsm pages

Izik Eidus wrote:
> From: Hugh Dickins <hugh.dickins@...cali.co.uk>
> 
> KSM will need to identify its kernel merged pages unambiguously,
> and /proc/kpageflags will probably like to do so too.
> 
> Since KSM will only be substituting anonymous pages, statistics are
> best preserved by making a PageKsm page a special PageAnon page:
> one with no anon_vma.
> 
> But KSM then needs its own page_add_ksm_rmap() - keep it in ksm.h near
> PageKsm; and do_wp_page() must COW them, unlike singly mapped PageAnons.

Acked-by: Rik van Riel <riel@...hat.com>

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