Linux kernel内存管理之free_area
2017-03-15 08:15
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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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