mmzone.c

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    1 /*
    2  * linux/mm/mmzone.c
    3  *
    4  * management codes for pgdats and zones.
    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                                         struct zone **zone)
   59 {
   60         /*
   61          * Find the next suitable zone to use for the allocation.
   62          * Only filter based on nodemask if it's set
   63          */
   64         if (likely(nodes == NULL))
   65                 while (zonelist_zone_idx(z) > highest_zoneidx)
   66                         z++;
   67         else
   68                 while (zonelist_zone_idx(z) > highest_zoneidx ||
   69                                 (z->zone && !zref_in_nodemask(z, nodes)))
   70                         z++;
   71 
   72         *zone = zonelist_zone(z);
   73         return z;
   74 }
   75 
   76 #ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
   77 int memmap_valid_within(unsigned long pfn,
   78                                         struct page *page, struct zone *zone)
   79 {
   80         if (page_to_pfn(page) != pfn)
   81                 return 0;
   82 
   83         if (page_zone(page) != zone)
   84                 return 0;
   85 
   86         return 1;
   87 }
   88 #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
   89 
   90 void lruvec_init(struct lruvec *lruvec)
   91 {
   92         enum lru_list lru;
   93 
   94         memset(lruvec, 0, sizeof(struct lruvec));
   95 
   96         for_each_lru(lru)
   97                 INIT_LIST_HEAD(&lruvec->lists[lru]);
   98 }

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FreeBSD/Linux Kernel Cross Reference sys/mm/mmzone.c

FreeBSD/Linux Kernel Cross Reference
sys/mm/mmzone.c