Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755251AbXJHCYj (ORCPT ); Sun, 7 Oct 2007 22:24:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753070AbXJHCYc (ORCPT ); Sun, 7 Oct 2007 22:24:32 -0400 Received: from smtp109.mail.mud.yahoo.com ([209.191.85.219]:27245 "HELO smtp109.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753002AbXJHCYb (ORCPT ); Sun, 7 Oct 2007 22:24:31 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:X-YMail-OSG:From:To:Subject:Date:User-Agent:Cc:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id; b=0krbWlX4F8672mrSN6UJrtEGhDL7kN2iHFGNVZOQ6tueZPkUoS2Dqy1lWA17GDqIjphWFkyHW+7ab3kz+nG0Ypq8eqxuXMzGmiCn86yCJgvaHWaK2YyLlkU2Zk+TowVbTECO6gWbX9iKTlu6YTCjzvIPTY2/WyeQuD6lN1jWMSI= ; X-YMail-OSG: TK5rW9gVM1nRQbuVOvTukScGgTBTSSAx2yf0d6Eaubc0nWNVaa2p.eoWCSLf5v.904gHx8Iyhg-- From: Nick Piggin To: Andrew Morton Subject: Re: race with page_referenced_one->ptep_test_and_clear_young and pagetable setup/pulldown Date: Sun, 7 Oct 2007 19:52:29 +1000 User-Agent: KMail/1.9.5 Cc: Jeremy Fitzhardinge , Hugh Dickens , David Rientjes , Zachary Amsden , Linus Torvalds , Rusty Russell , Andi Kleen , Keir Fraser , Linux Kernel Mailing List References: <470596C4.8060804@goop.org> <20071004194432.9b3353c2.akpm@linux-foundation.org> In-Reply-To: <20071004194432.9b3353c2.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200710071952.30192.nickpiggin@yahoo.com.au> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 958 Lines: 20 On Friday 05 October 2007 12:44, Andrew Morton wrote: > On Thu, 04 Oct 2007 18:43:32 -0700 Jeremy Fitzhardinge 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... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/