Question

‘Aging registers’ are _______

(a) Counters which indicate how long ago their associated pages have been Referenced

(b) Registers which keep track of when the program was last accessed

(c) Counters to keep track of last accessed instruction

(d) Counters to keep track of the latest data structures referred

I had been asked this question in examination.

This intriguing question comes from Runtime Storage Location topic in chapter Symbol Table of Compiler

Answer 1

The correct choice is (a) Counters which indicate how long ago their associated pages have been Referenced

The explanation is: This is known as aging.