code: boolean isProcessTreeOverLimit(ProcfsBasedProcessTree pTree, 
                                      String tId, long limit) {
      long currentMemUsage = pTree.getCumulativeVmem();
      // as processes begin with an age 1, we want to see if there are processes
      // more than 1 iteration old.
      long curMemUsageOfAgedProcesses = pTree.getCumulativeVmem(1);
      return isProcessTreeOverLimit(tId, currentMemUsage, 
                                    curMemUsageOfAgedProcesses, limit);
    }
docs: method provided just for easy testing purposes