[Bug 198147] [hwpmc] running pmcstat -t (top mode) whilst a process is running doesn't resolve the symbols correctly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198147

            Bug ID: 198147
           Summary: [hwpmc] running pmcstat -t (top mode) whilst a process
                    is running doesn't resolve the symbols correctly
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: adrian at freebsd.org

When running hwpmc on -HEAD or -10 (and likely earlier), there's a difference
between running pmcstat in top mode /before/ and /after/ the process under
inspection.

If the order is:

* run pmcstat in top mode;
* start process under inspection;

Then symbol resolution looks fine.

If the order is:

* start process under inspection;
* run pmcstat in top mode;

.. then it sees events for the process, but the resolved symbols aren't always
correct or working at all.

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