memory management during boot process

时间：2010-10-15 来源：letmego163

/*
* node_bootmem_map is a map pointer - the bits represent all physical
* memory pages (including holes) on the node.
*/
typedef struct bootmem_data {
    unsigned long node_min_pfn;
    unsigned long node_low_pfn;
    void *node_bootmem_map;
    unsigned long last_end_off;
    unsigned long hint_idx;
    struct list_head list;
} bootmem_data_t;

node_low_pfn is the number of the last page of the physical address space that can be managed directly; in other words, it is the end of ZONE_NORMAL.

node_bootmem_map is a pointer to the memory area in which the allocation bitmap is stored. On IA-32 systems, the memory area immediately following the kernel image is used for this purpose. The corresponding address is held in the _end variable, which is automatically patched into the kernel image during linking.

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