From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 22 Nov 2005 18:07:24 +0000 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 From: Andy Whitcroft Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Andy Whitcroft , kravetz@us.ibm.com, anton@samba.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: 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 -- 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