numa.c
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上传日期:2013-02-24
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文件大小:3k
- /*
- * Written by Kanoj Sarcar, SGI, Aug 1999
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/init.h>
- #include <linux/bootmem.h>
- #include <linux/mmzone.h>
- #include <linux/spinlock.h>
- int numnodes = 1; /* Initialized for UMA platforms */
- static bootmem_data_t contig_bootmem_data;
- pg_data_t contig_page_data = { bdata: &contig_bootmem_data };
- #ifndef CONFIG_DISCONTIGMEM
- /*
- * This is meant to be invoked by platforms whose physical memory starts
- * at a considerably higher value than 0. Examples are Super-H, ARM, m68k.
- * Should be invoked with paramters (0, 0, unsigned long *[], start_paddr).
- */
- void __init free_area_init_node(int nid, pg_data_t *pgdat, struct page *pmap,
- unsigned long *zones_size, unsigned long zone_start_paddr,
- unsigned long *zholes_size)
- {
- free_area_init_core(0, &contig_page_data, &mem_map, zones_size,
- zone_start_paddr, zholes_size, pmap);
- }
- #endif /* !CONFIG_DISCONTIGMEM */
- struct page * alloc_pages_node(int nid, unsigned int gfp_mask, unsigned int order)
- {
- #ifdef CONFIG_NUMA
- return __alloc_pages(gfp_mask, order, NODE_DATA(nid)->node_zonelists + (gfp_mask & GFP_ZONEMASK));
- #else
- return alloc_pages(gfp_mask, order);
- #endif
- }
- #ifdef CONFIG_DISCONTIGMEM
- #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
- static spinlock_t node_lock = SPIN_LOCK_UNLOCKED;
- void show_free_areas_node(pg_data_t *pgdat)
- {
- unsigned long flags;
- spin_lock_irqsave(&node_lock, flags);
- show_free_areas_core(pgdat);
- spin_unlock_irqrestore(&node_lock, flags);
- }
- /*
- * Nodes can be initialized parallely, in no particular order.
- */
- void __init free_area_init_node(int nid, pg_data_t *pgdat, struct page *pmap,
- unsigned long *zones_size, unsigned long zone_start_paddr,
- unsigned long *zholes_size)
- {
- int i, size = 0;
- struct page *discard;
- if (mem_map == (mem_map_t *)NULL)
- mem_map = (mem_map_t *)PAGE_OFFSET;
- free_area_init_core(nid, pgdat, &discard, zones_size, zone_start_paddr,
- zholes_size, pmap);
- pgdat->node_id = nid;
- /*
- * Get space for the valid bitmap.
- */
- for (i = 0; i < MAX_NR_ZONES; i++)
- size += zones_size[i];
- size = LONG_ALIGN((size + 7) >> 3);
- pgdat->valid_addr_bitmap = (unsigned long *)alloc_bootmem_node(pgdat, size);
- memset(pgdat->valid_addr_bitmap, 0, size);
- }
- static struct page * alloc_pages_pgdat(pg_data_t *pgdat, unsigned int gfp_mask,
- unsigned int order)
- {
- return __alloc_pages(gfp_mask, order, pgdat->node_zonelists + (gfp_mask & GFP_ZONEMASK));
- }
- /*
- * This can be refined. Currently, tries to do round robin, instead
- * should do concentratic circle search, starting from current node.
- */
- struct page * _alloc_pages(unsigned int gfp_mask, unsigned int order)
- {
- struct page *ret = 0;
- pg_data_t *start, *temp;
- #ifndef CONFIG_NUMA
- unsigned long flags;
- static pg_data_t *next = 0;
- #endif
- if (order >= MAX_ORDER)
- return NULL;
- #ifdef CONFIG_NUMA
- temp = NODE_DATA(numa_node_id());
- #else
- spin_lock_irqsave(&node_lock, flags);
- if (!next) next = pgdat_list;
- temp = next;
- next = next->node_next;
- spin_unlock_irqrestore(&node_lock, flags);
- #endif
- start = temp;
- while (temp) {
- if ((ret = alloc_pages_pgdat(temp, gfp_mask, order)))
- return(ret);
- temp = temp->node_next;
- }
- temp = pgdat_list;
- while (temp != start) {
- if ((ret = alloc_pages_pgdat(temp, gfp_mask, order)))
- return(ret);
- temp = temp->node_next;
- }
- return(0);
- }
- #endif /* CONFIG_DISCONTIGMEM */