《操作系统教学资料》操作系统复习题-7.docVIP

Chapter 8 – Virtual Memory True / False Questions: T / F – In a system employing a memory management strategy that doesn’t require an entire process to be in main memory at one time, the portion of a process that is actually in main memory at any given time is defined to be the resident set of the process. 在一个使用一个不需要整个的程序以一个次是在主存中的存储器管理系统中, 程序的部分实际上是在任何的给定时间是在主记忆中定义当程序的居留组。 ANS: T T / F – The condition known as thrashing occurs when the majority of the processes in main memory require repetitive blocking on a single shared I/O device in the system.在一个系统中，当大量的主存中的进程要求重复阻断一个单独共享的I/O设备的情况称之为系统抖动 ANS: F (processor spends most of its time swapping rather than executing) 错。是处理器花费大量时间不断进行交换块，而不是去执行指令 T / F – The modify (M) bit is a control bit in a page table entry that indicates whether the contents of the corresponding page have been altered since the page was last loaded into memory.修改位（M）是一个控制位，他表示相应页的内容从上一次装入主存中到现在是否已经发生变化。 ANS: T对 T / F – A Page Fault occurs when the desired page table entry is not found in the Translation Lookaside Buffer (TLB).一个页错误的发生是在转移后备缓冲器中不存在所需要的页 ANS: F (when the desired page is not found in main memory)错误，是发生在主存中不存在所需页表 T / F – One of the advantages to the programmer of virtual memory using segmentation is that it simplifies the handling of growing data structures by allowing the segment to grow or shrink as necessary.对程序员而言，使用虚拟内存的一个优点是它简化了处理增加的数据结构，这是通过允许段进行必要的增加或者缩小的操作 ANS: T对 T / F – In a combined paging/segmentation system, a user’s address space is broken up into a number of fixed-size pages, which in turn are broken up into a number of segments.在一个段页复用的系统中，一个用户的地址空间被划分程序多固定大小的页，这些也有被划分成许多段 ANS: F (opposite – segments/pages)错误的，先分成段，在进行分页 T / F – To achieve sharing in a segmentation system, it is possible for a segment to be referenced in the segment tables of more than one process. 为了实现在一个段系统的共享，一个段有可能再多共和进程的段表中被使用 ANS: T T / F – Linux is an example of an operating system that does not provide virtual me