K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2018-04-27T05:37:35.625013Z
K 7
svn:log
V 240
uma: whack main zone counter update in the slow path

Cached counters are typically zero at this point so it performs
avoidable atomics. Everything reading them also reads the cached
ones, thus there is really no point.

Reviewed by:		jeff

END