The following rules apply to each cpuset:
* Its CPUs and memory nodes must be a (possibly equal) subset of
its parent's.
* It can be marked cpu_exclusive only if its parent is.
* It can be marked mem_exclusive only if its parent is.
* If it is cpu_exclusive, its CPUs may not overlap any sibling.
* If it is memory_exclusive, its memory nodes may not overlap
any sibling.
