- When running out of swzone, instead of spewing an error message every   tick until the situation is resolved (if ever), just print a single   message when running out and another when space becomes available.
- When running out of swzone, instead of spewing an error message every
  tick until the situation is resolved (if ever), just print a single
  message when running out and another when space becomes available.

- When adding more swap, warn if the total amount exceeds half the
  theoretical maximum we can handle.

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