请教vmstat中avm含义

liaosnet

Memory: information about the usage of virtual and real memory. Virtual pages are considered active if they have been\r\n       accessed. A page is 4096 bytes.\r\n       avm\r\n            Active virtual pages.\r\n       fre\r\n            Size of the free list. Note: A large portion of real memory is utilized as a cache for file system data. It is not\r\n            unusual for the size of the free list to remain small.