K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2019-09-27T19:12:43.331728Z
K 7
svn:log
V 348
cache: make negative list shrinking a little bit concurrent

Continue protecting demotion from the hotlist and selection of the
target list with the ncneg_shrink_lock lock, but drop it before
relocking to zap the node.

While here count how many times we skipped shrinking due to the lock
being already taken.

Sponsored by:	The FreeBSD Foundation

END