r8 # chrt -r 40 sleep 5000 &  # example sleep process running in real time
r8 # ps axo pid,cls,cmd | awk '$2 ~ /(FF|RR)/' | grep -v '[[]'
 1831  RR sleep 5000

r8 # echo +cpu > cgroup.subtree_control 
-bash: echo: write error: Invalid argument