struct per_cpu_pageset

　　1 struct per_cpu_pageset

struct per_cpu_pageset {
        struct per_cpu_pages pcp;
#ifdef CONFIG_NUMA            //NUMA系统专用
        s8 expire;
#endif
#ifdef CONFIG_SMP
        s8 stat_threshold;
        s8 vm_stat_diff[NR_VM_ZONE_STAT_ITEMS];
#endif
};

　　2 struct per_cpu_pages

struct per_cpu_pages {
        int count;              /* number of pages in the list */
        int high;               /* high watermark, emptying needed */
        int batch;              /* chunk size for buddy add/remove */

        /* Lists of pages, one per migrate type stored on the pcp-lists */
        struct list_head lists[MIGRATE_PCPTYPES];
};