Discussion
Match each memory reclamation technique with what it does.
List I
A. Ballooning
B. Page sharing
C. Compression
D. Host swapping
List II
1. less used pages are compressed rather than swapped
2. a driver in the guest returns pages to the host
3. the last resort, with severe performance cost
4. identical pages across guests are stored once
Answer: A
The techniques are applied in that order of preference as pressure rises. Reaching host swapping means the overcommitment has gone too far. Each technique is tried before the next. Preference runs from cheapest to worst.
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