Javadoc
Returns a rough estimate on how much free mem is available for new vm
i.e. MemFree + Cached + Buffers + resident - memCommitted
resident set size of qemu processes may grow - up to memCommitted.
Thus, we deduct the growth potential of qemu processes, which is (memCommitted - resident)
Do not use. This value was computed using very naive algorithm without the
engine knowledge and does not reflect over-commit or Qemu overhead properly.
Please see the org.ovirt.engine.core.bll.utils.VmOverheadCalculatorImpl for much more
accurate algorithm and VDS#maxSchedulingMemory for a precomputed value.