K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2020-02-27T19:05:26.232297Z
K 7
svn:log
V 324
Simplify lazy advance with a 64bit atomic cmpset.

This provides the potential to force a lazy (tick based) SMR to advance
when there are blocking waiters by decoupling the wr_seq value from the
ticks value.

Add some missing compiler barriers.

Reviewed by:	rlibby
Differential Revision:	https://reviews.freebsd.org/D23825

END