See:

• https://github.com/illumos/illumos-gate/blob/79492562b32b5e6bc03e14ad2b51f986335f3709/usr/src/uts/intel/io/vmm/vmm_reservoir.c#L16-L78
• https://github.com/oxidecomputer/illumos-gate/blob/stlouis/usr/src/cmd/rsrvrctl/rsrvrctl.c
  • I found this in the ramdisk image in /usr/lib/rsrvrctl

This will probably be a blocker for accurate accounting in #2648