[$] Multi-generational LRU: the next generation

The multi-generational LRU patch set is a significant reworking of the
kernel's memory-management subsystem that promises better performance for a
number of workloads; it was covered here in
April. Since then, two new versions of that work have been released by
developer Yu Zhao, with
version 3
being posted on May 20. Some significant changes have been made since
the original post, so another look is in order.