[Bug 207068] hwpmc wrap around/sign extension

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207068

--- Comment #8 from joss.upton at yahoo.com ---
(In reply to Konstantin Belousov from comment #7)
Not sure why you can't reproduce, but I'm doing the equivalent of the shell
script below.  Note the ",usr" and the lowercase p.

  On a 4 core machine:
   while true; do
    for a in 1 2 3 4 5 6 7 8; do
    pmcstat -p CPU_CLK_UNHALTED_CORE,usr perl loop.pl &
    done
    sleep 10
    killall perl
   done

This ensures that the PMCs are csw in/out very often (every hz).

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