UMA:
- r340405: UMA bucket cache working set size estimator
  - Used to make uma_reclaim() less aggressive unless there is a severe shortage
  - See also r351673
- r343026: Infrastructural changes
  - Many of these changes were rewritten by Jeff in 2019/2020
- r343030: Use UMA to allocate paging bufs
- r350659: Add a cross-domain free bucket, add UMA_FIRSTTOUCH

vm_page:
- r349840: Add a per-CPU cache for VM_FREEPOOL_DIRECT
  - See also PG_PCPU_CACHE, which is used to reduce fragmentation caused by the
    caches.
- r349846:
  - Merge wire_count and hold_count
- r351198:
  - Allocate vm_page_array from domain-local memory (modulo 2MB)
  - See also r351742
- r352110
  - Generalize wire_count into a refcount, make it atomic
- r353535, r353537, 353538, 353539, r353540
  - Make the page busy lock a standalone lock that does not require the object
    lock to interlock
- r356155: Implement page queue state updates using cmpset loops instead of
  synchronizing using the page lock

vm_object:
- r351241: Make object PIP counter atomic, instead of synchronizing on the
  object lock
- r355122: Use atomics for object reference counter