Unaccounted memory usage when running Red Hat Enterprise Linux as a Hyper-V guest

Issue

• Unable to account for memory usage on a RHEL Hyper-V guest :

#free
             total       used       free     shared    buffers     cached
Mem:       8050848    7863516     187332          0     142464     190664
-/+ buffers/cache:    7530388     520460
Swap:      8191992      86680    8105312

• System shows high memory usage even though applications are not allocating that much memory :

#cat /proc/[0-9]*/smaps | grep -i Pss | awk 'BEGIN{sum=0}{sum+=$2} END {print sum}'
1874861