[Bug 213310] [patch] systat -zarc to display disk activities like -vm

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213310

            Bug ID: 213310
           Summary: [patch] systat -zarc to display disk activities like
                    -vm
           Product: Base System
           Version: CURRENT
          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 175531
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=175531&action=edit
patch to display dev activities on zarc screen

While watching ZFS and its memory usage activities, it is more useful to watch
disk activities at same time.  I took -vm disk activity display to devs.c and
made them reusable components to call from -vm and -zarc.

Below is a screen shot.


                       Total     MFU     MRU    Anon     Hdr   L2Hdr   Other
     ZFS ARC            185M     30M     64M     88M    380K      0K    909K

                                rate    hits  misses   total hits total misses
     arcstats                  :  0%       0       0         6150         2763
     arcstats.demand_data      :  0%       0       0          309            8
     arcstats.demand_metadata  :  0%       0       0         5828         1796
     arcstats.prefetch_data    :  0%       0       0            0          880
     arcstats.prefetch_metadata:  0%       0       0           13           79
     zfetchstats               :  0%       0       0          146         7806
     arcstats.l2               :  0%       0       0            0            0
     vdev_cache_stats          :  0%       0       0            0            0






Disks   md0  ada0   da0   da1   cd0 pass0 pass1 pass2 pass3
KB/t   0.00  0.00 54.87 43.92  0.00  0.00  0.00  0.00  0.00
tps       0     0   319   465     0     0     0     0     0
MB/s   0.00  0.00 17.10 19.92  0.00  0.00  0.00  0.00  0.00
%busy     0     0    86   100     0     0     0     0     0

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