From 6981ec31146cf19454c55c130625f6cee89aab95 Mon Sep 17 00:00:00 2001 From: Tang Chen Date: Fri, 22 Feb 2013 16:33:39 -0800 Subject: [PATCH] page_alloc: introduce zone_movable_limit[] to keep movable limit for nodes Introduce a new array zone_movable_limit[] to store the ZONE_MOVABLE limit from movablemem_map boot option for all nodes. The function sanitize_zone_movable_limit() will find out to which node the ranges in movable_map.map[] belongs, and calculates the low boundary of ZONE_MOVABLE for each node. Signed-off-by: Tang Chen Signed-off-by: Liu Jiang Reviewed-by: Wen Congyang Cc: Wu Jianguo Reviewed-by: Lai Jiangshan Tested-by: Lin Feng Cc: Mel Gorman Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 74 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index aa1cc5f..0f267d9 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -210,6 +210,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; static unsigned long __initdata required_kernelcore; static unsigned long __initdata required_movablecore; static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; +static unsigned long __meminitdata zone_movable_limit[MAX_NUMNODES]; /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ int movable_zone; @@ -4375,6 +4376,77 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid, return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); } +/** + * sanitize_zone_movable_limit - Sanitize the zone_movable_limit array. + * + * zone_movable_limit is initialized as 0. This function will try to get + * the first ZONE_MOVABLE pfn of each node from movablemem_map, and + * assigne them to zone_movable_limit. + * zone_movable_limit[nid] == 0 means no limit for the node. + * + * Note: Each range is represented as [start_pfn, end_pfn) + */ +static void __meminit sanitize_zone_movable_limit(void) +{ + int map_pos = 0, i, nid; + unsigned long start_pfn, end_pfn; + + if (!movablemem_map.nr_map) + return; + + /* Iterate all ranges from minimum to maximum */ + for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { + /* + * If we have found lowest pfn of ZONE_MOVABLE of the node + * specified by user, just go on to check next range. + */ + if (zone_movable_limit[nid]) + continue; + +#ifdef CONFIG_ZONE_DMA + /* Skip DMA memory. */ + if (start_pfn < arch_zone_highest_possible_pfn[ZONE_DMA]) + start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA]; +#endif + +#ifdef CONFIG_ZONE_DMA32 + /* Skip DMA32 memory. */ + if (start_pfn < arch_zone_highest_possible_pfn[ZONE_DMA32]) + start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA32]; +#endif + +#ifdef CONFIG_HIGHMEM + /* Skip lowmem if ZONE_MOVABLE is highmem. */ + if (zone_movable_is_highmem() && + start_pfn < arch_zone_lowest_possible_pfn[ZONE_HIGHMEM]) + start_pfn = arch_zone_lowest_possible_pfn[ZONE_HIGHMEM]; +#endif + + if (start_pfn >= end_pfn) + continue; + + while (map_pos < movablemem_map.nr_map) { + if (end_pfn <= movablemem_map.map[map_pos].start_pfn) + break; + + if (start_pfn >= movablemem_map.map[map_pos].end_pfn) { + map_pos++; + continue; + } + + /* + * The start_pfn of ZONE_MOVABLE is either the minimum + * pfn specified by movablemem_map, or 0, which means + * the node has no ZONE_MOVABLE. + */ + zone_movable_limit[nid] = max(start_pfn, + movablemem_map.map[map_pos].start_pfn); + + break; + } + } +} + #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, unsigned long zone_type, @@ -4392,7 +4464,6 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid, return zholes_size[zone_type]; } - #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, @@ -4839,7 +4910,6 @@ static void __init find_zone_movable_pfns_for_nodes(void) goto out; /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ - find_usable_zone_for_movable(); usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; restart: @@ -4998,6 +5068,8 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn) /* Find the PFNs that ZONE_MOVABLE begins at in each node */ memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); + find_usable_zone_for_movable(); + sanitize_zone_movable_limit(); find_zone_movable_pfns_for_nodes(); /* Print out the zone ranges */ -- 2.7.4