[comp.unix.internals] What does "missing" mean in 'pstat -s' output

duncan@comp.vuw.ac.nz (Duncan McEwan) (06/14/91)

We have a number of HP workstations running Mt Xinu's MOREbsd operating
system.  Doing a 'pstat -s' on many of these machines shows something
like the following...

	12120k used (3872k text), 6056k free, 2480k wasted, 3072k missing
	avail: 11*512k 1*256k 1*64k 3*16k 3*8k 8*4k 

I understand what the "wasted" field means, but would like to know the
significance of the "missing" field.  This number does not seem to change much
over time, although different workstations have different numbers (some have 0k
missing).

I have looked at the source to pstat and see how "missing" is calculated
(nswap - dmmax/2 - (used + free)), which seems reasonable, but that doesn't
tell me what it means to have "missing" swap space.  It also doesn't tell
me if there is anything I could be doing to avoid it, or what I can do to
find it again!

I'm not sure whether this is unique to MOREbsd.  Of the other machines we have
here, SunOS's pstat doesn't report a missing figure anymore, and HPUX doesn't
even have pstat.  I did try it on a microvax running 4.3 BSD Reno, and after
fixing some bugs in its pstat that were causing bogus results, it reported 0k
missing.  However, I don't know if that is always the case.

Thanks in advance to anyone who can explain...

Duncan