MFC r285282

  The intention of r254304 was to scan the active queue continuously.
  However, I've observed the active queue scan stopping when there are
  frequent free page shortages and the inactive queue is steadily refilled
  by other mechanisms, such as the sequential access heuristic in vm_fault()
  or madvise(2).  To remedy this problem, record the time of the last active
  queue scan, and always scan a number of pages proportional to the time
  since the last scan, regardless of whether that last scan was a
  timeout-triggered ("pass == 0") or free-page-shortage-triggered ("pass >
  0") scan.

  Also, on a timeout-triggered scan, allow a full scan of the active queue
  when the system is short of inactive pages.

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