linux-kernel - Re: race with page_referenced_one->ptep_test_and_clear

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Date:	Fri, 5 Oct 2007 10:03:44 +0200
From:	Andi Kleen <ak@...e.de>
To:	Keir Fraser <keir@...source.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickens <hugh@...itas.com>,
	David Rientjes <rientjes@...gle.com>,
	Zachary Amsden <zach@...are.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: race with page_referenced_one->ptep_test_and_clear_young and pagetable setup/pulldown


> Fortuitously, Jan Beulich has a patch to fix this. It's not going to be
> directly applicable to 2.6.23-rc series, but should be easily ported:
> <http://lists.xensource.com/archives/html/xen-devel/2007-03/msg01200.html>.

Do I misread that patch or does it really walk the complete address
space and try to take all possible locks? Isn't that very slow?

-Andi
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