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

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Date:	Sun, 7 Oct 2007 19:52:29 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.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>, Andi Kleen <ak@...e.de>,
	Keir Fraser <keir@...source.com>,
	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

On Friday 05 October 2007 12:44, Andrew Morton wrote:
> On Thu, 04 Oct 2007 18:43:32 -0700 Jeremy Fitzhardinge <jeremy@...p.org> 
wrote:
> > David's change 10a8d6ae4b3182d6588a5809a8366343bc295c20, "i386: add
> > ptep_test_and_clear_{dirty,young}" has introduced an SMP race which
> > affects the Xen pv-ops backend.
>
> y'know, I think I think it's been several years since I saw a report of an
> honest to goodness, genuine SMP race in core kernel.  We used to be
> infested by them, but the term has fallen into disuse.  Interesting, but
> OT.

Does that include data races on weakly ordered systems, or UP races
(ie. with sleeping locks rather than spinning ones)? ;) Because we had
and have a few of those...
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