K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2016-01-21T01:04:03.049252Z
K 7
svn:log
V 435
cache: use counter(9) API to maintain statistics

Previously the code would just increment statistics while only holding a
shared lock, in effect losing updates.

Separate tracking for nchstats is removed as values can be obtained from
existing counters. Note that some fields are updated by external
consumers and are left unfixed. This should not be a serious issue as
this structure looks quite obsolete.

No strong objections: kib

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