K 10
svn:author
V 6
rlibby
K 8
svn:date
V 27
2019-05-16T05:29:54.907584Z
K 7
svn:log
V 359
db show thread: avoid overflow in tick conversion

The previous calculations for displaying the time since last switch
easily overflowed, after less than 36 min for hz=1000.  Now overflow
takes 2000 times longer (as long as ticks takes to wrap).

Reviewed by:	cem, markj
Sponsored by:	Dell EMC Isilon
Differential revision:	https://reviews.freebsd.org/D20273

END