> From: VaX#n8 <vax@ccwf.cc.utexas.edu>
> Subject: VM trace tool
> To: tech-kern@netbsd.org
> Date: Sat, 17 Jun 1995 02:40:37 -0500 (CDT)
> ...
> Also, I've heard:
> > It's mostly the Mach 2.5 VM system, with some changes from Mach 3.0
> 
> However, it appears to still use a (pagedaemon) process, which makes me
> think it's a little older.  Does it support external pagers?  I was told
> this would be a good way to support CVM, and would require less hacking
> to the kernel.
>
Mach 2.5 and 3.0 still have a pageout daemon.  In 3.0 and maybe 2.5 it
is not a separate task (process) but it is still a dedicated thread.
But you are right, it is derived from Mach 2.0 with changes from both
2.5 and 3.0.  It does not support external pagers.