Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932202AbVIGSez (ORCPT ); Wed, 7 Sep 2005 14:34:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932204AbVIGSez (ORCPT ); Wed, 7 Sep 2005 14:34:55 -0400 Received: from dvhart.com ([64.146.134.43]:5514 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S932202AbVIGSey (ORCPT ); Wed, 7 Sep 2005 14:34:54 -0400 Date: Wed, 07 Sep 2005 11:34:51 -0700 From: "Martin J. Bligh" Reply-To: "Martin J. Bligh" To: Dave Hansen Cc: Magnus Damm , Linux Kernel Mailing List , linux-mm , "A. P. Whitcroft [imap]" Subject: Re: [PATCH] i386: single node SPARSEMEM fix Message-ID: <521510000.1126118091@flay> In-Reply-To: <1126117674.7329.27.camel@localhost> References: <20050906035531.31603.46449.sendpatchset@cherry.local> <1126114116.7329.16.camel@localhost> <512850000.1126117362@flay> <1126117674.7329.27.camel@localhost> X-Mailer: Mulberry/2.1.2 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1177 Lines: 29 --On Wednesday, September 07, 2005 11:27:54 -0700 Dave Hansen wrote: > On Wed, 2005-09-07 at 11:22 -0700, Martin J. Bligh wrote: >> CONFIG_NUMA was meant to (and did at one point) support both NUMA and flat >> machines. This is essential in order for the distros to support it - same >> will go for sparsemem. > > That's a different issue. The current code works if you boot a NUMA=y > SPARSEMEM=y machine with a single node. The current Kconfig options > also enforce that SPARSEMEM depends on NUMA on i386. > > Magnus would like to enable SPARSEMEM=y while CONFIG_NUMA=n. That > requires some Kconfig changes, as well as an extra memory present call. > I'm questioning why we need to do that when we could never do > DISCONTIG=y while NUMA=n on i386. Ah, OK - makes more sense. However, some machines do have large holes in e820 map setups - is not really critical, more of an efficiency thing. M. - 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/