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#define MAX_ORDER 10
typedef struct free_area_struct {
struct list_head free_list;
unsigned int *map;
} free_area_t;
struct pglist_data;//此處是什么意思。為什么在下面才定義。。為什么不直接在這個(gè)地方定義這個(gè)結(jié)構(gòu)>？
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;
#define ZONE_DMA 0
#define ZONE_NORMAL 1
#define ZONE_HIGHMEM 2
#define MAX_NR_ZONES 3
/*
* One allocation request operates on a zonelist. A zonelist
* is a list of zones, the first one is the 'goal' of the
* allocation, the other zones are fallback zones, in decreasing
* priority.
*
* Right now a zonelist takes up less than a cacheline. We never
* modify it apart from boot-up, and only a few indices are used,
* so despite the zonelist table being relatively big, the cache
* footprint of this construct is very small.
*/
typedef struct zonelist_struct {
zone_t * zones [MAX_NR_ZONES+1]; // NULL delimited
int gfp_mask;
} zonelist_t;
#define NR_GFPINDEX 0x100
struct bootmem_data; //此處又出現(xiàn)了同樣的問(wèn)題。但是在下面也沒(méi)有定義。。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;
有知道的告訴我下。。謝謝了。
[ 本帖最后由 ianglm 于 2006-3-15 14:11 編輯 ] |
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發(fā)表于 2006-03-15 09:48
