Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754741Ab1E0McI (ORCPT ); Fri, 27 May 2011 08:32:08 -0400 Received: from e28smtp09.in.ibm.com ([122.248.162.9]:35140 "EHLO e28smtp09.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750886Ab1E0McB (ORCPT ); Fri, 27 May 2011 08:32:01 -0400 From: Ankita Garg 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 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> X-Mailer: git-send-email 1.7.4 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: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2971 Lines: 90 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 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/