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Linux/mm/mmzone.c

  1 /*
  2  * linux/mm/mmzone.c
  3  *
  4  * management codes for pgdats, zones and page flags
  5  */
  6 
  7 
  8 #include <linux/stddef.h>
  9 #include <linux/mm.h>
 10 #include <linux/mmzone.h>
 11 
 12 struct pglist_data *first_online_pgdat(void)
 13 {
 14         return NODE_DATA(first_online_node);
 15 }
 16 
 17 struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
 18 {
 19         int nid = next_online_node(pgdat->node_id);
 20 
 21         if (nid == MAX_NUMNODES)
 22                 return NULL;
 23         return NODE_DATA(nid);
 24 }
 25 
 26 /*
 27  * next_zone - helper magic for for_each_zone()
 28  */
 29 struct zone *next_zone(struct zone *zone)
 30 {
 31         pg_data_t *pgdat = zone->zone_pgdat;
 32 
 33         if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
 34                 zone++;
 35         else {
 36                 pgdat = next_online_pgdat(pgdat);
 37                 if (pgdat)
 38                         zone = pgdat->node_zones;
 39                 else
 40                         zone = NULL;
 41         }
 42         return zone;
 43 }
 44 
 45 static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
 46 {
 47 #ifdef CONFIG_NUMA
 48         return node_isset(zonelist_node_idx(zref), *nodes);
 49 #else
 50         return 1;
 51 #endif /* CONFIG_NUMA */
 52 }
 53 
 54 /* Returns the next zone at or below highest_zoneidx in a zonelist */
 55 struct zoneref *__next_zones_zonelist(struct zoneref *z,
 56                                         enum zone_type highest_zoneidx,
 57                                         nodemask_t *nodes)
 58 {
 59         /*
 60          * Find the next suitable zone to use for the allocation.
 61          * Only filter based on nodemask if it's set
 62          */
 63         if (likely(nodes == NULL))
 64                 while (zonelist_zone_idx(z) > highest_zoneidx)
 65                         z++;
 66         else
 67                 while (zonelist_zone_idx(z) > highest_zoneidx ||
 68                                 (z->zone && !zref_in_nodemask(z, nodes)))
 69                         z++;
 70 
 71         return z;
 72 }
 73 
 74 #ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
 75 bool memmap_valid_within(unsigned long pfn,
 76                                         struct page *page, struct zone *zone)
 77 {
 78         if (page_to_pfn(page) != pfn)
 79                 return false;
 80 
 81         if (page_zone(page) != zone)
 82                 return false;
 83 
 84         return true;
 85 }
 86 #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
 87 
 88 void lruvec_init(struct lruvec *lruvec)
 89 {
 90         enum lru_list lru;
 91 
 92         memset(lruvec, 0, sizeof(struct lruvec));
 93 
 94         for_each_lru(lru)
 95                 INIT_LIST_HEAD(&lruvec->lists[lru]);
 96 }
 97 
 98 #if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)
 99 int page_cpupid_xchg_last(struct page *page, int cpupid)
100 {
101         unsigned long old_flags, flags;
102         int last_cpupid;
103 
104         do {
105                 old_flags = flags = page->flags;
106                 last_cpupid = page_cpupid_last(page);
107 
108                 flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
109                 flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
110         } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags));
111 
112         return last_cpupid;
113 }
114 #endif
115 

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