Consider the following page reference string, for a process with 5 virtual pages, and three frames in memory, and fill in the tables for the LRU.
Homework Answers
When a page reference is not in the frames, we report a page fault with X, unless a frame is empty and the frame is filled with that page reference. When a page fault occurs, the page reference which was used least recently is replaced with the current page reference.
| Page Reference | Frame 1 | Frame 2 | Frame 3 | Page Fault | Reason |
| A | A | X | Since all frames are empty, We fill Frame 1 with A. | ||
| B | A | B | X | Since two frames are empty, We fill Frame 2 with B. | |
| C | A | B | C | X | Since one frame is empty, We fill Frame 3 with C. |
| B | A | B | C | B is present in Frame 2, so no page fault. | |
| D | D | B | C | X | Since A is referenced least recently compared to B and C, it is replaced with D. |
| E | D | B | E | X | Since C is referenced least recently compared to B and D, it is replaced with E. |
| A | D | A | E | X | Since B is referenced least recently compared to D and E, it is replaced with A. |
| B | B | A | E | X | Since D is referenced least recently compared to A and E, it is replaced with B. |
| C | B | A | C | X | Since E is referenced least recently compared to B and A, it is replaced with C. |
| D | B | D | C | X | Since A is referenced least recently compared to B and C, it is replaced with D. |
| A | A | D | C | X | Since B is referenced least recently compared to D and C, it is replaced with A. |
Total page faults is 10.
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