> We could possibly avoid this by swapping the pages back
>in after one minute of inactivity, then letting the
>disk spin down.
Why not also write pages out to swap before it's really necessary?
If they were left mapped but marked as having up-to-date copies
on swap, they could be discarded immediately if the system needed
memory. (Of course if they got written to they would have to be
paged out again.)
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