K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2019-10-29T20:58:46.673491Z
K 7
svn:log
V 397
Use atomics and a shared object lock to protect the object reference count.

Certain consumers still need to guarantee a stable reference so we can not
switch entirely to atomics yet.  Exclusive lock holders can still modify
and examine the refcount without using the ref api.

Reviewed by:	kib
Tested by:	pho
Sponsored by:	Netflix, Intel
Differential Revision:	https://reviews.freebsd.org/D21598

END