serf: adds new, stateful memory-pressure thresholds #546
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pkova
approved these changes
Nov 8, 2023
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This PR adjusts the serf's memory-pressure thresholds, adds state to track threshold events and avoid thrashing ("schmitt trigger"), and refactors post-event operation to use a bitmap and track operations more granularly.
These changes are useful on there own, and necessary for adding memory-pressure-based trimming to #508.