bin/49266: sysctl(8) can't print uvmexp

[dholland%eecs.harvard.edu@localhost]

>Number:         49266
>Category:       bin
>Synopsis:       sysctl(8) can't print uvmexp
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 09 20:20:00 +0000 2014
>Originator:     David A. Holland
>Release:        NetBSD 7.99.1 (20140819)
>Organization:
>Environment:
System: NetBSD macaran 7.99.1 NetBSD 7.99.1 (MACARAN) #21: Tue Aug 19 20:08:43 EDT 2014 dholland@macaran:/usr/src/sys/arch/amd64/compile/MACARAN amd64
Architecture: x86_64
Machine: amd64
>Description:

% sysctl vm.uvmexp
sysctl: vm.uvmexp: use 'vmstat' or 'systat' to view this information
% sysctl vm.uvmexp2
sysctl: vm.uvmexp2: use 'vmstat' or 'systat' to view this information
% 

This is lame.

Also, if trying to get stuff from scripts the (semi-)uniform output of
sysctl(8) is often preferable over other random tools.

>How-To-Repeat:
as above

>Fix:

add some printing code

It's possible that sysctl(8) should be able to handle individual
fields of uvmexp as three-level MIBs, e.g.

% sysctl vm.uvmexp2.active
vm.uvmexp2.active = 447806

If so (it seems like a good idea to me, anyway) there's a question as
to whether this should be an emulation inside sysctl(8) or done
kernel-side.