K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2018-10-20T20:41:25.760984Z
K 7
svn:log
V 129
Add a dev_refthread.9 document.

Reviewed by:	kib
Sponsored by:	Dell EMC Isilon
Differential:	https://reviews.freebsd.org/D16897

END