Add support for per-cpu event counters, to be used for clock and IPI
counters where the event being counted occurs across all CPUs in the
system. Counter instances can be made per-cpu by calling evc

Add support for per-cpu event counters, to be used for clock and IPI
counters where the event being counted occurs across all CPUs in the
system. Counter instances can be made per-cpu by calling evcount_percpu()
after the counter is attached, and this can occur before or after all system
CPUs are attached. Per-cpu counter instances should be incremented using
evcount_inc().

ok kettenis@ jca@ cheloha@

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fix order in SEE ALSO

Adjust references for sysctl(3) to sysctl(2)

obvious cases of missing .An;
found with the new mandoc(1) MANDOCERR_AN_MISSING warning;
no text changes

Update evcount(9) documentation to reflect simplifications.

"yes, that's fine" jmc@

convert to new .Dd format;

tweaks;
ok jaredy@

add initial manpage for the evcount API