linux-kernel - Re: [RFC][PATCH] mm: fix page

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Message-Id: <E1HPH6v-0003CT-00@dorka.pomaz.szeredi.hu>
Date:	Thu, 08 Mar 2007 12:48:41 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	a.p.zijlstra@...llo.nl
CC:	npiggin@...e.de, akpm@...ux-foundation.org, mingo@...e.hu,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org, jdike@...toit.com, hugh@...itas.com,
	torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH] mm: fix page_mkclean() vs non-linear vmas

> However this still leaves the non-linear reclaim (Nick pointed it out as
> a potential DoS and other people have corroborated this). I have no idea
> on that to do about that.

OK, but that is a completely different problem, not affecting
page_mkclean() or msync().

And it doesn't sound too hard to solve: when current algorithm doesn't
seem to be making progress, then it will have to be done the hard way,
searching for for all nonlinear ptes of a page to unmap.

Miklos
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