Main-Memory Management 主存管理 Memory is a large array of words or bytes, each with its own address. It is a repository of quickly accessible data shared by the CPU and l/o devices 存储器是字或字节的一个大数组,每一字或字节有自己的地址。它是一个可被 cPU和O共享、可快速存取数据的存放地 Main memory is a volatile storage device. It loses its contents in the case of system failure主存储器是一个易失性存储设备。系统失败时,会丢失其内容 The operating system is responsible for the following activities in connections with memory management 在同存储管理有关的活动中,操作系统负责下列事务: whep track of which parts of memory are currently being used and by 保持记录存储器的哪一部分当前被使用以及被谁使用 Decide which processes to load when memory space becomes available当有可用存储空间时,决定调入哪个进程 Allocate and deallocate memory space as needed 需要时分配和收回存储空间 Applied Operating System Concepts 3.4Applied Operating System Concepts 3.4 Main-Memory Management 主存管理 • Memory is a large array of words or bytes, each with its own address. It is a repository of quickly accessible data shared by the CPU and I/O devices. 存储器是字或字节的一个大数组，每一字或字节有自己的地址。它是一个可被 CPU和I/O 共享、可快速存取数据的存放地 • Main memory is a volatile storage device. It loses its contents in the case of system failure.主存储器是一个易失性存储设备。系统失败时，会丢失其内容 • The operating system is responsible for the following activities in connections with memory management: 在同存储管理有关的活动中，操作系统负责下列事务： – Keep track of which parts of memory are currently being used and by whom. 保持记录存储器的哪一部分当前被使用以及被谁使用 – Decide which processes to load when memory space becomes available.当有可用存储空间时，决定调入哪个进程 – Allocate and deallocate memory space as needed. 需要时分配和收回存储空间