[Bug 223149] [patch] top displays total swap size exceeds the maximum system can handle

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223149

            Bug ID: 223149
           Summary: [patch] top displays total swap size exceeds the
                    maximum system can handle
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ota at j.email.ne.jp
          Keywords: patch

Created attachment 187351
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187351&action=edit
top displays Total up to swap_maxpages

Top's "Swap Total" is the sum of all swap spaces and not the maximum of a
system can handle.

Especially when gap is large, system starts killing tasks even if top displays
large swap space still available.  People use top to monitor system activities
and amount exceeding usable space is confusing.

The patch reduces to the system maximum when total swap space is more than the
system can handle.

In addition, the patch grabs pagesize() only once to reduce extra calls.

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