RCA:
  As per current code in script it moves the thread of any gluster process those have gluster keyword 
  as a substring and as of now all gluster threads has glfs prefix so script is not able to move all
  gluster threads to new created cgroup and cgroup restriction are not working

  if ps -T -p ${daemon_pid} | grep gluster > /dev/null; then
  for thid in `ps -T -p ${daemon_pid} | grep gluster | awk -F " " '{print $2}'`;
    do
      echo ${thid} > ${LOC}/${cgroup_name}/tasks ;
    done
  if cat /proc/${daemon_pid}/cgroup | grep -w ${cgroup_name} > /dev/null; then
    echo "Tasks are attached successfully specific to ${daemon_pid} to ${cgroup_name}."
  else
    echo "Tasks are not attached successfully."
  fi
fi
 
To avoid the same need to change the script for loop condition like below

if ps -T -p ${daemon_pid} | grep gluster > /dev/null; then
  for thid in `ps -T -p ${daemon_pid} | grep -v SPID | awk -F " " '{print $2}'`;
    do
      echo ${thid} > ${LOC}/${cgroup_name}/tasks ;
    done
  if cat /proc/${daemon_pid}/cgroup | grep -w ${cgroup_name} > /dev/null; then
    echo "Tasks are attached successfully specific to ${daemon_pid} to ${cgroup_name}."
  else
    echo "Tasks are not attached successfully."
  fi
fi

REVIEW: https://review.gluster.org/23635 (extras: Cgroup(CPU/Mem) restriction are not working on gluster process) posted (#1) for review on release-6 by MOHIT AGRAWAL

REVIEW: https://review.gluster.org/23635 (extras: Cgroup(CPU/Mem) restriction are not working on gluster process) merged (#2) on release-6 by hari gowtham