From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qa0-f51.google.com (mail-qa0-f51.google.com [209.85.216.51]) by kanga.kvack.org (Postfix) with ESMTP id 601FE6B0031 for ; Tue, 18 Feb 2014 11:57:13 -0500 (EST) Received: by mail-qa0-f51.google.com with SMTP id f11so23470054qae.38 for ; Tue, 18 Feb 2014 08:57:13 -0800 (PST) Received: from qmta13.emeryville.ca.mail.comcast.net (qmta13.emeryville.ca.mail.comcast.net. [2001:558:fe2d:44:76:96:27:243]) by mx.google.com with ESMTP id a8si10661930qak.80.2014.02.18.08.57.12 for ; Tue, 18 Feb 2014 08:57:12 -0800 (PST) Date: Tue, 18 Feb 2014 10:57:09 -0600 (CST) From: Christoph Lameter Subject: Re: [RFC PATCH 2/3] topology: support node_numa_mem() for determining the fallback node In-Reply-To: <20140217070051.GE3468@lge.com> Message-ID: References: <1391674026-20092-2-git-send-email-iamjoonsoo.kim@lge.com> <20140207054819.GC28952@lge.com> <20140210191321.GD1558@linux.vnet.ibm.com> <20140211074159.GB27870@lge.com> <20140213065137.GA10860@linux.vnet.ibm.com> <20140217070051.GE3468@lge.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Joonsoo Kim Cc: Nishanth Aravamudan , David Rientjes , Han Pingtian , Pekka Enberg , Linux Memory Management List , Paul Mackerras , Anton Blanchard , Matt Mackall , linuxppc-dev@lists.ozlabs.org, Wanpeng Li On Mon, 17 Feb 2014, Joonsoo Kim wrote: > On Wed, Feb 12, 2014 at 10:51:37PM -0800, Nishanth Aravamudan wrote: > > Hi Joonsoo, > > Also, given that only ia64 and (hopefuly soon) ppc64 can set > > CONFIG_HAVE_MEMORYLESS_NODES, does that mean x86_64 can't have > > memoryless nodes present? Even with fakenuma? Just curious. x86_64 currently does not support memoryless nodes otherwise it would have set CONFIG_HAVE_MEMORYLESS_NODES in the kconfig. Memoryless nodes are a bit strange given that the NUMA paradigm is to have NUMA nodes (meaning memory) with processors. MEMORYLESS nodes means that we have a fake NUMA node without memory but just processors. Not very efficient. Not sure why people use these configurations. > I don't know, because I'm not expert on NUMA system :) > At first glance, fakenuma can't be used for testing > CONFIG_HAVE_MEMORYLESS_NODES. Maybe some modification is needed. Well yeah. You'd have to do some mods to enable that testing. -- 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