Prevent ticks rollover from preventing vm_lowmem event
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Authored by rstone on Aug 20 2015, 3:07 PM.

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rS286970: Prevent ticks rollover from preventing vm_lowmem event

Summary

Currently vm_pageout_scan() uses a ticks-based scheme to rate-limit
the number of times that the vm_lowmem event will happen. However
if no events happen for long enough for ticks to roll over, this
leaves us in a long window in which vm_lowmem events will not
happen.

Replace the use of ticks with time_t to prevent rollover from ever
being an issue.