linux-kernel - Re: [RFC] mlock/stack guard interaction fixup

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Message-ID: <1282586021.2605.2106.camel@laptop>
Date:	Mon, 23 Aug 2010 19:53:41 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ian Jackson <ijackson@...ark.greenend.org.uk>,
	Greg KH <gregkh@...e.de>, Ian Campbell <ijc@...lion.org.uk>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [RFC] mlock/stack guard interaction fixup

On Mon, 2010-08-23 at 10:34 -0700, Linus Torvalds wrote:
> It's also
> dubious as a way to pin particular pages in the page tables, because
> it's not necessarily something that the semantics guarantee
> (historically mlock just guarantees that they won't be swapped out,
> not that they will necessarily maintain some particular mapping). 

Quite so, and esp. now that page migration gets used more with all that
memory compaction stuff that got merged.
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