linux-kernel - Re: [PATCH 2/6] ksm: dont allow overlap memory addresses registrations.

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Message-ID: <Pine.LNX.4.64.0905061424480.19190@blonde.anvils>
Date:	Wed, 6 May 2009 14:28:33 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
cc:	Rik van Riel <riel@...hat.com>, Izik Eidus <ieidus@...hat.com>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	chrisw@...hat.com, alan@...rguk.ukuu.org.uk, device@...ana.org,
	linux-mm@...ck.org, nickpiggin@...oo.com.au
Subject: Re: [PATCH 2/6] ksm: dont allow overlap memory addresses registrations.

On Wed, 6 May 2009, Andrea Arcangeli wrote:
> 
> For example for the swapping of KSM pages we've been thinking of using
> external rmap hooks to avoid the VM to know anything specific to KSM
> pages but to still allow their unmapping and swap.

There may prove to be various reasons why it wouldn't work out in practice;
but when thinking of swapping them, it is worth considering if those KSM
pages can just be assigned to a tmpfs file, then leave the swapping to that.

Hugh
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