From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965089AbVKVSHw (ORCPT ); Tue, 22 Nov 2005 13:07:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965087AbVKVSHv (ORCPT ); Tue, 22 Nov 2005 13:07:51 -0500 Received: from 81-179-232-225.dsl.pipex.com ([81.179.232.225]:11973 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S965085AbVKVSHu (ORCPT ); Tue, 22 Nov 2005 13:07:50 -0500 Date: Tue, 22 Nov 2005 18:07:24 +0000 To: Andrew Morton Cc: Andy Whitcroft , kravetz@us.ibm.com, anton@samba.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 0/2] SPARSEMEM: pfn_to_nid implementation v2 Message-ID: References: <20051119233151.01ce6c50.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline InReply-To: <20051119233151.01ce6c50.akpm@osdl.org> User-Agent: Mutt/1.5.9i From: Andy Whitcroft Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org There are three places we define pfn_to_nid(). Two in linux/mmzone.h and one in asm/mmzone.h. These in essence represent the three memory models. The definition in linux/mmzone.h under !NEED_MULTIPLE_NODES is both the FLATMEM definition and the optimisation for single NUMA nodes; the one under SPARSEMEM is the NUMA sparsemem one; the one in asm/mmzone.h under DISCONTIGMEM is the discontigmem one. This is not in the least bit obvious, particularly the connection between the non-NUMA optimisations and the memory models. Following in the email are two patches: flatmem-split-out-memory-model: simplifies the selection of pfn_to_nid() implementations. The selection is based primarily off the memory model selected. Optimisations for non-NUMA are applied where needed. sparse-provide-pfn_to_nid: implement pfn_to_nid() for SPARSEMEM Boot tested on for both SPARSEMEM and DISCONTIGMEM on all my test boxes. Also compile tested for FLATMEM and SPARSEMEM without NUMA. Against 2.6.15-rc2. Next I'll review the configuration options to see if we can simplify them any. -apw