Consider the following page fault handler algorithm. Replace the * in the algorithm with ____.
1 If there is no free page frame
Then
Select page to be swapped out using page removal algorithm
Update job's Page Map Table
If content of page had been changed then
*
End if
End if
2 Use page number from step 3 from the Hardware Instruction Processing Algorithm to get disk address where the requested page is stored
3 Read page into memory
4 Update job's Page Map Table
5 Update Memory Map Table
6 Restart interrupted instruction
A) save page to main memory
B) write page to disk
C) mark page as being changed in PMT
D) choose another page

Question

Consider the following page fault handler algorithm. Replace the * in the algorithm with ____. 
1 If there is no free page frame
Then
Select page to be swapped out using page removal algorithm
Update job's Page Map Table
If content of page had been changed then
*
End if
End if
2 Use page number from step 3 from the Hardware Instruction Processing Algorithm to get disk address where the requested page is stored
3 Read page into memory
4 Update job's Page Map Table
5 Update Memory Map Table
6 Restart interrupted instruction
A) save page to main memory
B) write page to disk
C) mark page as being changed in PMT
D) choose another page

Quizplus · Accepted Answer

When a page fault occurs and there is no free page frame, the algorithm selects a page to be swapped out and updates the job's Page Map Table. If the content of the page being swapped out has been modified, it needs to be written back to disk before being swapped out. This is indicated by the * in the algorithm, which should be replaced by "write page to disk". Therefore, the best choice is B.

Consider the Following Page Fault Handler Algorithm