Chapter 37

Question 1

What is demand paging

Answer 1

It is technique to implement virtual memory

Question 2

Does intel 386 machine allows global and local segments both

Answer 2

Yes

Question 3

How many segments can be entertained by intel CPU

Answer 3

16K segments

Question 4

What is role of linear address space

Answer 4

It tells how much is the size of offset in a segment

Question 5

How many segments can be access at a time by a processor in Intel processor

Answer 5

6 as it has 6 registers

Question 6

What is page directory

Answer 6

Linear address p1 part is called page directory.

Question 7

What are 2 techniques to implement virtual memory

Answer 7

1. Demand paging (move page in main memory which is in demand)
2. Demand segmentation (move segment in main memory which is in demand)

Question 8

What is vfork()

Answer 8

Virtual memory fork

Question 9

What is response time, overall response or first response

Answer 9

First response

Question 10

When a page is referenced valid and it is not in memory then what happens

Answer 10

Page fault

Question 11

What is page replacement

Answer 11

Swap in and swap out a page

Question 12

Which are 2 types of instructions which are not trivial to restart

Answer 12

1. Auto increment/decrements
2. String move
   Its solution is to copy them before hand

Question 13

What is EAT

Answer 13

Effective Access Time

Question 14

What happens in page fault and should we avoid page fault

Answer 14

Slow down system, Yes we should avoid it