Explain about memory-management scheme, Operating System

Q. In the IBM/370 memory protection is offered through the use of keys. A key is a 4-bit quantity every 2K block of memory has a key (the storage key) associated with it. The CPU as well has a key (the protection key) associated with it. A store operation is permitted only if both keys are equal or if either is zero. Which of the subsequent memory-management schemes could be used successfully with this hardware?

a. Bare machine

b. Single-user system

c. A Multiprogramming with a fixed number of processes

d. A Multiprogramming with a variable number of processes

e. Paging

f. Segmentation

Answer:

a. Protection not necessary set system key to 0.

b. Set system key to 0 when in supervisor mode.

c. Region sizes should be fixed in increments of 2k bytes allocate key with memory blocks.

d. Same as above.

e. Frame sizes should be in increments of 2k bytes, allocate key with pages.

f. Segment sizes should be in increments of 2k bytes, allocate key with segments.

Posted Date: 7/27/2013 5:15:41 AM | Location : United States







Related Discussions:- Explain about memory-management scheme, Assignment Help, Ask Question on Explain about memory-management scheme, Get Answer, Expert's Help, Explain about memory-management scheme Discussions

Write discussion on Explain about memory-management scheme
Your posts are moderated
Related Questions
Consider a particular system that does not have an interrupting clock.  The only way a thread can lose the processor is to voluntarily surrender it.  Additionally, the operating sy

Question : (a) The dynamic allocation problem is how to satisfy a request of size n from a list of free holes into memory. The best-fit, first-fit and worst-fit strategies are

What is the kernel? A more common explanation is that the OS is the one program running at all times on the computer  usually known as the kernel, with all else being applicati

How can a user program disturb the normal operation of the system? a) Issuing illegal I/O operation. b) By accessing memory locations within the OS itself. c) Refusing to

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Q. Is the Internet a LAN or else a WAN? Answer: The Internet is a WAN as the a variety of computers are located at geographically different places and are connected by long-dis



Question 1 What is a message passing system? Discuss the desirable features of a message passing system Question 2 Discuss the implementation of RPC Mechanism in detail Q

What does the last four digits '0010' of the above dump represent? What action will the Destination node takes when it receives this packet? The last four digits '0010' denotes