Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1162128AbWKPA4X (ORCPT ); Wed, 15 Nov 2006 19:56:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1162136AbWKPA4X (ORCPT ); Wed, 15 Nov 2006 19:56:23 -0500 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:17577 "EHLO fgwmail5.fujitsu.co.jp") by vger.kernel.org with ESMTP id S1162128AbWKPA4W (ORCPT ); Wed, 15 Nov 2006 19:56:22 -0500 Date: Thu, 16 Nov 2006 09:59:45 +0900 From: KAMEZAWA Hiroyuki To: Christoph Lameter Cc: mbligh@mbligh.org, krafft@de.ibm.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [patch 2/2] enables booting a NUMA system where some nodes have no memory Message-Id: <20061116095945.e6ad4440.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: References: <20061115193049.3457b44c@localhost> <20061115193437.25cdc371@localhost> <455B8F3A.6030503@mbligh.org> <455B98AA.3040904@mbligh.org> Organization: Fujitsu X-Mailer: Sylpheed version 2.2.0 (GTK+ 2.6.10; i686-pc-mingw32) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1047 Lines: 35 On Wed, 15 Nov 2006 14:51:26 -0800 (PST) Christoph Lameter wrote: > On Wed, 15 Nov 2006, Martin Bligh wrote: > > > Supposing we hot-unplugged all the memory in a node? Or seems to have > > happened in this instance is boot with mem=, cutting out memory on that > > node. > > So a node with no memory has a pgdat_list structure but no zones? Or empty > zones? > The node has just empty-zone. pgdat/per-cpu-area is allocated on an other (nearest) node. I hear some vender's machine has this configuration. (ia64, maybe SGI or HP) Node0: CPUx0 + XXXGb memory Node1: CPUx2 + 16MB memory Node2: CPUx2 + 16MB memory memory of Node1 and Node2 is tirmmed at boot by GRANULE alignment. Then, final view is Node0 : memory-only-node Node1 : cpu-only-node Node2 : cpu-only-node. -Kame - 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/