tweak solaris memory usage

[Pierre-Philipp Braun]

Hello again,

for linux cpu usage, there are two values in the graph:
  - cpu user
  - cpu wait

for linux memory usage, there is only one value, which is the currently 
used memory, without the buffers nor cache, right ?

for solaris, also only one value, but there, it's the overall used 
memory, not deducing the ZFS cache nor the Page cache.  So the chart is 
quite useless, as it shows up always almost full.  Where to change that 
in the code (either using multiples values or deducing zfs & page cache 
from it)?

Thanks