Linux物理内存相关数据结构

typedef struct pglist_data {
zone_t node_zones[MAX_NR_ZONES];
zonelist_t node_zonelists[NR_GFPINDEX];
struct page *node_mem_map;
unsigned long *valid_addr_bitmap;
struct bootmem_data *bdata;
unsigned long node_start_paddr;
unsigned long node_start_mapnr;
unsigned long node_size;
int node_id;
struct pglist_data *node_next;
} pg_data_t;

typedef struct zone_struct {
/*
* Commonly accessed fields:
*/
spinlock_t        lock;
unsigned long        offset;
unsigned long        free_pages;
unsigned long        inactive_clean_pages;
unsigned long        inactive_dirty_pages;
unsigned long        pages_min, pages_low, pages_high;

/*
* free areas of different sizes
*/
struct list_head    inactive_clean_list;
free_area_t        free_area[MAX_ORDER];

/*
* rarely used fields:
*/
char            *name;
unsigned long        size;
/*
* Discontig memory support fields.
*/
struct pglist_data    *zone_pgdat;
unsigned long        zone_start_paddr;
unsigned long        zone_start_mapnr;
struct page        *zone_mem_map;
} zone_t;

typedef struct page {
struct list_head list;
struct address_space *mapping;
unsigned long index;
struct page *next_hash;
atomic_t count;
unsigned long flags;    /* atomic flags, some possibly updated asynchronously */
struct list_head lru;
unsigned long age;
wait_queue_head_t wait;
struct page **pprev_hash;
struct buffer_head * buffers;
void *virtual; /* non-NULL if kmapped */
struct zone_struct *zone;
} mem_map_t;