GATE | Gate IT 2008 | Question 54

Match the following flag bits used in the context of virtual memory management on the left side with the different purposes on the right side of the table below.
(A) I-d, II-a, III-b, IV-c
(B) I-b, II-c, III-a, IV-d
(C) I-c, II-d, III-a, IV-b
(D) I-b, II-c, III-d, IV-a

Answer: (D)

Explanation: Dirty:- Dirty bit is used for whenever a page has been modify and we try to replace it and then this has to be written back so it write-back or leave it. Therefore dirty bit is used for write-back policy.
R/W:- R/W is used for page protection.
Reference:- It says which page has not referred recently. Hence it is used for page replacement policy.
Valid:- It says wether the page page you are looking for it present in MM or not. If not present in MM then load into the SM i.e. called page intiallisation.

Option (d) is correct.

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