From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta7.messagelabs.com (mail6.bemta7.messagelabs.com [216.82.255.55]) by kanga.kvack.org (Postfix) with ESMTP id 55ACC6B0023 for ; Fri, 27 May 2011 08:32:05 -0400 (EDT) Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by e28smtp03.in.ibm.com (8.14.4/8.13.1) with ESMTP id p4RCVxKE009949 for ; Fri, 27 May 2011 18:01:59 +0530 Received: from d28av05.in.ibm.com (d28av05.in.ibm.com [9.184.220.67]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p4RCVtrM4259856 for ; Fri, 27 May 2011 18:01:59 +0530 Received: from d28av05.in.ibm.com (loopback [127.0.0.1]) by d28av05.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p4RCVrZY003742 for ; Fri, 27 May 2011 22:31:53 +1000 From: Ankita Garg Subject: [PATCH 10/10] mm: Create memory regions at boot-up Date: Fri, 27 May 2011 18:01:38 +0530 Message-Id: <1306499498-14263-11-git-send-email-ankita@in.ibm.com> In-Reply-To: <1306499498-14263-1-git-send-email-ankita@in.ibm.com> References: <1306499498-14263-1-git-send-email-ankita@in.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org Cc: ankita@in.ibm.com, svaidy@linux.vnet.ibm.com, thomas.abraham@linaro.org Memory regions are created at boot up time, from the information obtained from the firmware. This patchset was developed on ARM platform, on which at present u-boot bootloader does not export information about memory units that can be independently power managed. For the purpose of demonstration, 2 hard coded memory regions are created, of 256MB each on the Panda board with 512MB RAM. Signed-off-by: Ankita Garg --- include/linux/mmzone.h | 8 +++----- mm/page_alloc.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+), 5 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index bc3e3fd..5dbe1e1 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -627,14 +627,12 @@ typedef struct mem_region_list_data { */ struct bootmem_data; typedef struct pglist_data { -/* The linkage to node_zones is now removed. The new hierarchy introduced - * is pg_data_t -> mem_region -> zones - * struct zone node_zones[MAX_NR_ZONES]; - */ struct zonelist node_zonelists[MAX_ZONELISTS]; int nr_zones; #ifdef CONFIG_FLAT_NODE_MEM_MAP /* means !SPARSEMEM */ - struct page *node_mem_map; + strs pg_data_t -> mem_region -> zones + * struct zone node_zones[MAX_NR_ZONES]; + */uct page *node_mem_map; #ifdef CONFIG_CGROUP_MEM_RES_CTLR struct page_cgroup *node_page_cgroup; #endif diff --git a/mm/page_alloc.c b/mm/page_alloc.c index da8b045..3d994e8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4285,6 +4285,34 @@ static inline int pageblock_default_order(unsigned int order) #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ +#define REGIONS_SIZE (512 << 20) >> PAGE_SHIFT + +static void init_node_memory_regions(struct pglist_data *pgdat) +{ + int cnt = 0; + unsigned long i; + unsigned long start_pfn = pgdat->node_start_pfn; + unsigned long spanned_pages = pgdat->node_spanned_pages; + unsigned long total = 0; + + for (i = start_pfn; i < start_pfn + spanned_pages; i+= REGIONS_SIZE) { + mem_region_t *mem_region = &pgdat->mem_regions[cnt]; + + mem_region->start_pfn = i; + if ((spanned_pages - total) <= REGIONS_SIZE) { + mem_region->spanned_pages = spanned_pages - total; + } + else + mem_region->spanned_pages = REGIONS_SIZE; + + mem_region->node = pgdat->node_id; + mem_region->region = cnt; + pgdat->nr_mem_regions++; + total += mem_region->spanned_pages; + cnt++; + } +} + /* * Set up the zone data structures: * - mark all pages reserved @@ -4447,6 +4475,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size, (unsigned long)pgdat->node_mem_map); #endif + init_node_memory_regions(pgdat); free_area_init_core(pgdat, zones_size, zholes_size); } -- 1.7.4 -- 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