On Saturday, September 1, 2018, Steve Mynott <steve.mynott@gmail.com> wrote:

>
>
> On Wed, 29 Aug 2018 at 15:53, Larry McVoy <lm@mcvoy.com> wrote:
>
> The BSDs have a less than optimal VM system.  Having SunOS opened up
>> would at least let people see what they are missing.  Maybe I have
>> rose colored glasses on but it was the only kernel that came into
>> focus for me and you could see the architecture from the code.
>> Everything else seems like a mess to me.
>>
>
> That may have been true in the late 80s and even early 90s but I'd have
> thought FreeBSD, NetBSD and OpenBSD would have useable VMs by now.
>
> I've vague recollections that these all originally used the VM from Mach
> which did have problems at first.
>
> I recall a more knowledgeable friend complaining about FreeBSD VM in 1994
> or so.
>
> I think the latter two use UVM and FreeBSD improved their Mach one (which
> has a SunOS kvmish API anyway). I've not seen complaints about modern BSD.
>
>

Wasn't the whole FreeBSD VM rewritten by John Dyson and David Greenman in
the mid-late 90's?  And then further improved by Matthew Dillon.

Unfortunately they are not affiliated with the project anymore.  All three
had exceptional coding skills.

--Andy