From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <43E02945.2000508@jp.fujitsu.com> Date: Wed, 01 Feb 2006 12:21:41 +0900 From: KAMEZAWA Hiroyuki MIME-Version: 1.0 Subject: [RFC][PATCH] remove zone_mem_map [1/4] remove zone_mem_map. Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: linux-mm Cc: "Martin J. Bligh" List-ID: This patch removes zone->zone_mem_map. Againt 2.6.16-rc1. Because of SPARSEMEM's cleanup, there are no codes which touches zone->zone_mem_map directly. My purpose is: Reduce the assumptions of zones. Because of zone_mem_map, zone is considered to have contiguous mem_map. This patch removes that needless? assumption. I'll try to remove zone_start_pfn etc.. if I can go ahead. This patch affects many archs which has NUMA, so enough tests should be done. But I don't have test environments... Please notify me if the kernel cannot be compiled or perfomance goes down because of this patch. Sigh, binary modules which uses page_to_pfn() will not work either ;) Signed-Off-By: KAMEZAWA Hiroyuki Index: hogehoge/include/linux/mmzone.h =================================================================== --- hogehoge.orig/include/linux/mmzone.h +++ hogehoge/include/linux/mmzone.h @@ -212,7 +212,6 @@ struct zone { * Discontig memory support fields. */ struct pglist_data *zone_pgdat; - struct page *zone_mem_map; /* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */ unsigned long zone_start_pfn; Index: hogehoge/mm/page_alloc.c =================================================================== --- hogehoge.orig/mm/page_alloc.c +++ hogehoge/mm/page_alloc.c @@ -2009,7 +2009,6 @@ static __meminit void init_currently_emp zone_wait_table_init(zone, size); pgdat->nr_zones = zone_idx(zone) + 1; - zone->zone_mem_map = pfn_to_page(zone_start_pfn); zone->zone_start_pfn = zone_start_pfn; memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn); -- 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