From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with ESMTP id B6DD68D003B for ; Wed, 20 Apr 2011 07:51:35 -0400 (EDT) Received: by gxk23 with SMTP id 23so234545gxk.14 for ; Wed, 20 Apr 2011 04:51:34 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20110420112020.GA31296@parisc-linux.org> References: <20110420102314.4604.A69D9226@jp.fujitsu.com> <20110420161615.462D.A69D9226@jp.fujitsu.com> <20110420112020.GA31296@parisc-linux.org> Date: Wed, 20 Apr 2011 14:28:26 +0300 Message-ID: Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards From: Pekka Enberg Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org List-ID: To: Matthew Wilcox Cc: KOSAKI Motohiro , Christoph Lameter , James Bottomley , Michal Hocko , Andrew Morton , Hugh Dickins , linux-mm@kvack.org, LKML , linux-parisc@vger.kernel.org, David Rientjes , Ingo Molnar , x86 maintainers Hi Matthew, On Wed, Apr 20, 2011 at 10:34:23AM +0300, Pekka Enberg wrote: >> That part makes me think the best option is to make parisc do >> CONFIG_NUMA as well regardless of the historical intent was. On Wed, Apr 20, 2011 at 2:20 PM, Matthew Wilcox wrote: > But it's not just parisc. =A0It's six other architectures as well, some > of which aren't even SMP. =A0Does !SMP && NUMA make any kind of sense? IIRC, we actually fixed SLAB or SLUB to work on such configs in the past. On Wed, Apr 20, 2011 at 2:20 PM, Matthew Wilcox wrote: > I think really, this is just a giant horrible misunderstanding on the par= t > of the MM people. =A0There's no reason why an ARM chip with 16MB of memor= y > at 0 and 16MB of memory at 1GB should be saddled with all the NUMA gunk. Right. My point was simply that since x86 doesn't support DISCONTIGMEM without NUMA, the misunderstanding is likely very wide-spread. Pekka -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org