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zone 空闲页管理：
/* Free memory management - zoned buddy allocator. */#ifndef CONFIG_FORCE_MAX_ZONEORDER#define MAX_ORDER 11#else#define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER#endif#define MAX_ORDER_NR_PAGES (1 << (MAX_ORDER - 1))
/* free areas of different sizes */ struct free_area free_area[MAX_ORDER];
Order MIGRATE_TYPES--------------- ----> ------------------|free_area：0 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------- ----> ------------------|free_area：1 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------ ----> ------------------|free_area：2 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------- ----> ------------------|free_area：3 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------ ----> ------------------|free_area：4 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------- ----> ------------------|free_area：5 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------ ----> ------------------|free_area：6 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------- ----> ------------------|free_area：7 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------ ----> ------------------|free_area：8 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------- ----> ------------------|free_area：9 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ------------------------------------ ----> ------------------|free_area：10 | |MIGRATE_UNMOVABLE |--------------- |MIGRATE_MOVABLE | |MIGRATE_RECLAIMABLE| |MIGRATE_PCPTYPES | |MIGRATE_CMA | |MIGRATE_ISOLATE | | nr_free | ---------------------
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