GATE | GATE CS 1997 | Question 25

Dirty bit for a page in a page table
(A) helps avoid unnecessary writes on a paging device
(B) helps maintain LRU information
(C) allows only read on a page
(D) none of the above


Answer: (A)

Explanation: Dirty bit is used whenever a page has been modifying and we are trying to replace it and then this has to be written back so whether to do write-back or leave it dirty bit is required so dirty bit used for write-back. Hence, Dirty bit for a page in a page table helps avoid unnecessary writes on a paging device

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