[Bug 195460] New: [patch] systat to display zfs arc cache status/info

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195460

            Bug ID: 195460
           Summary: [patch] systat to display zfs arc cache status/info
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ota at j.email.ne.jp

Created attachment 149947
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149947&action=edit
systat -zarc

Added "zarc" command to display arc cache usage and hit/miss statistics.  It is
similar to zfs-mon but light weight as unlike zfs-mon, systat directly calls
sysctl.

% systat -zarc
                       Total     MFU     MRU    Anon     Hdr   L2Hdr   Other
     ZFS ARC            206M     63M    136M    826K   1102K      0K   5251K

                                rate    hits  misses   total hits total misses
     arcstats                  : 75%    1183     388        23721         4202
     arcstats.demand_data      :  0%       0       0          528            0
     arcstats.demand_metadata  : 76%    1007     308        21441         2757
     arcstats.prefetch_data    :  0%       0       0            0            0
     arcstats.prefetch_metadata: 68%     176      80         1752         1445
     zfetchstats               : 44%     954    1204        26410        25482
     arcstats.l2               :  0%       0       0            0            0
     vdev_cache_stats          :  0%       0       0            0            0

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