mm/numa.c

   1 /*
   2  * Written by Kanoj Sarcar, SGI, Aug 1999
   3  */
   4 #include <linux/config.h>
   5 #include <linux/kernel.h>
   6 #include <linux/mm.h>
   7 #include <linux/init.h>
   8 #include <linux/bootmem.h>
   9 #include <linux/mmzone.h>
  10 #include <linux/spinlock.h>
  11
  12 int numnodes = 1;       /* Initialized for UMA platforms */
  13
  14 #ifndef CONFIG_DISCONTIGMEM
  15
  16 static bootmem_data_t contig_bootmem_data;
  17 pg_data_t contig_page_data = { bdata: &contig_bootmem_data };
  18
  19 /*
  20  * This is meant to be invoked by platforms whose physical memory starts
  21  * at a considerably higher value than 0. Examples are Super-H, ARM, m68k.
  22  * Should be invoked with paramters (0, 0, unsigned long *[], start_paddr).
  23  */
  24 void __init free_area_init_node(int nid, pg_data_t *pgdat,
  25         unsigned long *zones_size, unsigned long zone_start_paddr,
  26         unsigned long *zholes_size)
  27 {
  28         free_area_init_core(0, NODE_DATA(0), &mem_map, zones_size,
  29                                                 zone_start_paddr, zholes_size);
  30 }
  31
  32 #endif /* !CONFIG_DISCONTIGMEM */
  33
  34 struct page * alloc_pages_node(int nid, int gfp_mask, unsigned long order)
  35 {
  36         return __alloc_pages(NODE_DATA(nid)->node_zonelists + gfp_mask, order);
  37 }
  38
  39 #ifdef CONFIG_DISCONTIGMEM
  40
  41 #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
  42
  43 static spinlock_t node_lock = SPIN_LOCK_UNLOCKED;
  44
  45 void show_free_areas_node(int nid)
  46 {
  47         unsigned long flags;
  48
  49         spin_lock_irqsave(&node_lock, flags);
  50         printk("Memory information for node %d:\n", nid);
  51         show_free_areas_core(nid);
  52         spin_unlock_irqrestore(&node_lock, flags);
  53 }
  54
  55 /*
  56  * Nodes can be initialized parallely, in no particular order.
  57  */
  58 void __init free_area_init_node(int nid, pg_data_t *pgdat,
  59         unsigned long *zones_size, unsigned long zone_start_paddr,
  60         unsigned long *zholes_size)
  61 {
  62         int i, size = 0;
  63         struct page *discard;
  64
  65         if (mem_map == (mem_map_t *)NULL)
  66                 mem_map = (mem_map_t *)PAGE_OFFSET;
  67
  68         free_area_init_core(nid, pgdat, &discard, zones_size, zone_start_paddr,
  69                                                 zholes_size);
  70         pgdat->node_id = nid;
  71
  72         /*
  73          * Get space for the valid bitmap.
  74          */
  75         for (i = 0; i < MAX_NR_ZONES; i++)
  76                 size += zones_size[i];
  77         size = LONG_ALIGN((size + 7) >> 3);
  78         pgdat->valid_addr_bitmap = (unsigned long *)alloc_bootmem_node(nid, size);
  79         memset(pgdat->valid_addr_bitmap, 0, size);
  80 }
  81
  82 /*
  83  * This can be refined. Currently, tries to do round robin, instead
  84  * should do concentratic circle search, starting from current node.
  85  */
  86 struct page * alloc_pages(int gfp_mask, unsigned long order)
  87 {
  88         struct page *ret = 0;
  89         int startnode, tnode;
  90 #ifndef CONFIG_NUMA
  91         unsigned long flags;
  92         static int nextnid = 0;
  93 #endif
  94
  95         if (order >= MAX_ORDER)
  96                 return NULL;
  97 #ifdef CONFIG_NUMA
  98         tnode = numa_node_id();
  99 #else
 100         spin_lock_irqsave(&node_lock, flags);
 101         tnode = nextnid;
 102         nextnid++;
 103         if (nextnid == numnodes)
 104                 nextnid = 0;
 105         spin_unlock_irqrestore(&node_lock, flags);
 106 #endif
 107         startnode = tnode;
 108         while (tnode < numnodes) {
 109                 if ((ret = alloc_pages_node(tnode++, gfp_mask, order)))
 110                         return(ret);
 111         }
 112         tnode = 0;
 113         while (tnode != startnode) {
 114                 if ((ret = alloc_pages_node(tnode++, gfp_mask, order)))
 115                         return(ret);
 116         }
 117         return(0);
 118 }
 119
 120 #endif /* CONFIG_DISCONTIGMEM */