Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161141AbXBGKiD (ORCPT ); Wed, 7 Feb 2007 05:38:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161164AbXBGKiC (ORCPT ); Wed, 7 Feb 2007 05:38:02 -0500 Received: from fgwmail7.fujitsu.co.jp ([192.51.44.37]:32775 "EHLO fgwmail7.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161141AbXBGKiA (ORCPT ); Wed, 7 Feb 2007 05:38:00 -0500 Date: Wed, 7 Feb 2007 19:37:49 +0900 From: KAMEZAWA Hiroyuki To: Andi Kleen Cc: linux-kernel@vger.kernel.org, y-goto@jp.fujitsu.com, clameter@engr.sgi.com, akpm@osdl.org Subject: Re: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node Message-Id: <20070207193749.fa58632e.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <200702071119.03125.ak@suse.de> References: <20070206202312.4f979bcf.kamezawa.hiroyu@jp.fujitsu.com> <20070207190738.30f1d419.kamezawa.hiroyu@jp.fujitsu.com> <200702071119.03125.ak@suse.de> 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: 1248 Lines: 31 On Wed, 7 Feb 2007 11:19:02 +0100 Andi Kleen wrote: > > > AFAIK, ia64 creates nodes just depends on SRAT's possible resource information. > > Then, ia64 can create cpu-memory-less-node(node with no available resource.). > > (*)I don't like this. > > > > If we don't allow memory-less-node, we may have to add several codes for cpu-hot-add. > > cpus should be moved to nearby node at hotadd . > > And node-hot-add have to care that cpus mustn't be added before memory, cpu-driven > > node-hot-add will never occur. (ACPI's 'container' device spec can't guaranntee this.) > > You can also alias node numbers to solve this: just point multiple node numbers > to the same pgdat. For a memory less node this would be a nearby one. > Hmm, interesting...the 'alias' means follwing ? == NODE_DATA(A) = pgdat_for_A NODE_DATA(B) = pgdat_for_A // B is memory-less. - NODE_DATA(B) is valid but B is not online. == looks complicated..and we have to care /sys/devices/system/node handling. -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/