When I execute 'cat /proc/{pid}/status' what do the fields VmSize, VmLck, VmRSS, VmData, VmStk, VmExe, and VmLib mean?

The status fields mean the following:

• VmSize:
  Virtual memory size
  This is the virtual memory usage of the entire process. It is the sum of VmLib, VmExe, VmData, and VmStk.

• VmLck:
  Virtual memory locked
  This is the amount of virtual memory which is currently in use and locked by the p...