Comment by bch

> Mach’s virtual memory (VM) system was influential beyond the project – it was adopted by 4.4BSD and later FreeBSD as their memory management subsystem.

…and NetBSD[0], OpenBSD[1], but apparently not DragonFly BSD[2].

[0] https://netbsd.org/docs/kernel/uvm.html

[1] https://man.openbsd.org/OpenBSD-3.0/uvm.9

[2] https://www.dragonflybsd.org/mailarchive/kernel/2011-04/msg0...