From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id 5723F6B004D for ; Mon, 27 Jul 2009 21:13:56 -0400 (EDT) Received: from m4.gw.fujitsu.co.jp ([10.0.50.74]) by fgwmail5.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id n6S1Du35009644 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Tue, 28 Jul 2009 10:13:56 +0900 Received: from smail (m4 [127.0.0.1]) by outgoing.m4.gw.fujitsu.co.jp (Postfix) with ESMTP id 0838B45DE60 for ; Tue, 28 Jul 2009 10:13:56 +0900 (JST) Received: from s4.gw.fujitsu.co.jp (s4.gw.fujitsu.co.jp [10.0.50.94]) by m4.gw.fujitsu.co.jp (Postfix) with ESMTP id D728145DE4D for ; Tue, 28 Jul 2009 10:13:55 +0900 (JST) Received: from s4.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s4.gw.fujitsu.co.jp (Postfix) with ESMTP id BC71F1DB8037 for ; Tue, 28 Jul 2009 10:13:55 +0900 (JST) Received: from m108.s.css.fujitsu.com (m108.s.css.fujitsu.com [10.249.87.108]) by s4.gw.fujitsu.co.jp (Postfix) with ESMTP id 656111DB8043 for ; Tue, 28 Jul 2009 10:13:52 +0900 (JST) Date: Tue, 28 Jul 2009 10:11:57 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [BUG] set_mempolicy(MPOL_INTERLEAV) cause kernel panic Message-Id: <20090728101157.9465b2e5.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: References: <20090715182320.39B5.A69D9226@jp.fujitsu.com> <1247679064.4089.26.camel@useless.americas.hpqcorp.net> <20090724160936.a3b8ad29.akpm@linux-foundation.org> <337c5d83954b38b14a17f0adf4d357d8.squirrel@webmail-b.css.fujitsu.com> <5bb65c0e4c6828b1331d33745f34d9ee.squirrel@webmail-b.css.fujitsu.com> <9443f91bd4648e6214b32acff4512b97.squirrel@webmail-b.css.fujitsu.com> <20090728085810.f7ae678a.kamezawa.hiroyu@jp.fujitsu.com> <20090728092529.bb0d7e9c.kamezawa.hiroyu@jp.fujitsu.com> <20090728095453.1fe79de1.kamezawa.hiroyu@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: David Rientjes Cc: Andrew Morton , Lee Schermerhorn , KOSAKI Motohiro , miaox@cn.fujitsu.com, Ingo Molnar , Peter Zijlstra , Christoph Lameter , Paul Menage , Nick Piggin , y-goto@jp.fujitsu.com, Pekka Enberg , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Mon, 27 Jul 2009 18:02:50 -0700 (PDT) David Rientjes wrote: > On Tue, 28 Jul 2009, KAMEZAWA Hiroyuki wrote: > > > > The problem originally reported here doesn't appear to have anything to do > > > with hotplug, it looks like it is the result of Lee's observation that > > > ia64 defaults top_cpuset's mems to N_POSSIBLE, which _should_ have been > > > updated by cpuset_init_smp(). > > cpuset_init_smp() just updates cpuset's mask. > > init's task->mems_allowed is intizialized independently from cpuset's mask. > > > > Presumably the bug is that N_HIGH_MEMORY is not a subset of N_ONLINE at > this point on ia64. > N_HIGH_MEMORY is must be subset of N_ONLINE, at the any moment. Hmm, I'll look into what happens in ia64 world. > > Could you teach me a pointer for Lee's observation ? > > > > http://marc.info/?l=linux-kernel&m=124767909310293 > Aha, my patch is very similar to Lee's one. And he said "hotplug is issue", yes. it is. Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org