Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751455AbXBMSSw (ORCPT ); Tue, 13 Feb 2007 13:18:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751454AbXBMSSv (ORCPT ); Tue, 13 Feb 2007 13:18:51 -0500 Received: from ns1.suse.de ([195.135.220.2]:35713 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751455AbXBMSSv (ORCPT ); Tue, 13 Feb 2007 13:18:51 -0500 From: Andi Kleen To: "Martin J. Bligh" Subject: Re: [RFC] [PATCH] more support for memory-less-node. Date: Tue, 13 Feb 2007 19:18:45 +0100 User-Agent: KMail/1.9.5 Cc: KAMEZAWA Hiroyuki , LKML , Andrew Morton , Christoph Lameter , bob.picco@hp.com References: <20070213155736.1131d46a.kamezawa.hiroyu@jp.fujitsu.com> <200702131845.05913.ak@suse.de> <45D1FF43.9050800@mbligh.org> In-Reply-To: <45D1FF43.9050800@mbligh.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200702131918.45885.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1060 Lines: 31 > I wasn't suggesting having NULL pointers for pgdats, if that's what you > mean. That is what started the original thread at least. Can happen on some ia64 platforms. > Just nodes with no memory in them, the pgdat would still be there. > pgdat = struct node, except everything's badly named. Ok those can happen even on x86-64, mostly because it's possible to fill up a node early during boot up with bootmem and then it's effectively empty. [there is even still a open bug when this happens on node 0] Handling out of memory here of course has to be always done. Just NULL pointers in core data structures are evil. But I'm glad we agree here. Now if it's better to set up a empty node or use a nearby node for a memory less cpu can be further discussed. I still think I lean towards the later. -Andi - 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/