High memory usage on OpenShift 3.1 nodes

Issue

• We are seeing very high memory usage on the virtual machines running atomic-openshift-node:

  top - 17:05:06 up 21 days, 23:37,  1 user,  load average: 5.62, 5.24, 4.98
  Tasks: 290 total,  1 running, 289 sleeping,  0 stopped,  0 zombie
  %Cpu(s):  4.9 us, 22.6 sy,  0.0 ni, 60.6 id, 10.4 wa,  0.0 hi,  0.1 si,  1.5 st
  KiB Mem : 16268668 total,  1395984 free, 13664484 used,  1208200 buff/cache
  KiB Swap:  4194300 total,  795236 free,  3399064 used.  1689556 avail Mem
  Change delay from 3.0 to
    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM    TIME+ COMMAND
  23496 root      20  0 17.468g 9.836g  11612 S 172.2 63.4  11608:05 openshift