Two Writes Out Of Four
A machine has three physical frames and uses strict LRU replacement. All pages start out of memory. The access trace is:
| step | access | page | operation |
|---|---|---|---|
| 1 | read | A | load |
| 2 | read | B | load |
| 3 | write | C | store |
| 4 | read | A | load |
| 5 | write | D | store |
| 6 | read | C | load |
| 7 | read | E | load |
| 8 | write | B | store |
| 9 | read | A | load |
The OS writes an evicted page back to swap only when its dirty bit is set. How many disk writes does this trace cause?
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