[Bug 290207] [ZFS] lowering "vfs.zfs.arc.max" to a low value causes kernel threads of "arc_evict" to use 91% CPU and disks to wait. System gets unresponsive...

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290207

--- Comment #24 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #23)

Here is my quick hack for converting vmstat -z output to also
have total bytes (size*used) as an additional column --and to
avoid spaces inside fields and to always have at least a space
between fields. It should make for an easier before vs. after
differences or for sorting or such.

# vmstat -z \
| sed -E 's@^([^:]*) +@\1_@g' | sed -E 's@^([^:]*) +@\1_@g' \
| sed -E 's@(:|,)@\1 @g' \
| awk '
BEGIN { linecount=0; }
{ linecount++; if (linecount==1) { print $0, "Total_Bytes "; next; }
  print $0, " ", $2*$4;
}
'

The double sed of the same pattern is because one prefix string
(ending with ":") has two spaces in it to replace.

Something like "sort -nr -k10,10 -k1,1" of the output should
work.

I've not generalized it to also deal with size*free. But such
might be important.

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