In SKAS mode, /proc/mm makes UML kernel and UML user processes into different address spaces.
What I want to know /proc/mm asigns the address space for UML user processes or UML
kernel? Do many UML processes run on the /proc/mm?
   In TT mode ,why UML kernel and UML processes run in  the same space? and how to do to make TT mode
change to SKAS mode?  because of /proc/mm? how does /proc/mm work?