Question

Order the following steps is response to a page fault: A trap switch to privilege mode and process is blocked OS update page table with frame number and set valid bit to 1 > A page is accessed and the valid bit in the page table is set to 0 < > OS find the requested frame in the back store OS put process back to ready queue and call scheduler < OS load requested page in an empty frame <

Answer 1

Page faults are handles with the following process:

If the page being referenced by the program is not found in the table, then the following process occurs in that order:

1.) A trap signal is raised to the OS and the process is blocked.

2.) The OS searched for page on the backing store.

3.) After the page is found, it brings in the page to a free frame in the physical memory

4.) Then, OS updates the page table with the frame number , and set valid bit to 1.

5.) THen, the OS put the process back to the ready queue to restart the application.

6.) After the page is accesed by the application, the valid bit is set to 0.

Answer:

option 1: answer: 1

option 2: answer: 4

option 3: answer: 6

option 4: answer: 2

option 5: answer: 5

option 6: answer: 3