On Sun, Dec 05, 2021 at 01:32:14PM -0500, Waiman Long wrote: > In validate_change(), there is a check since v2.6.12 to make sure that > each of the child cpusets must be a subset of a parent cpuset. IOW, it > allows child cpusets to restrict what changes can be made to a parent's > "cpuset.cpus". This actually violates one of the core principles of the > default hierarchy where a cgroup higher up in the hierarchy should be > able to change configuration however it sees fit as deligation breaks > down otherwise. > > To address this issue, the check is now removed for the default hierarchy > to free parent cpusets from being restricted by child cpusets. The > check will still apply for legacy hierarchy. > > Suggested-by: Tejun Heo <tj@xxxxxxxxxx> > Signed-off-by: Waiman Long <longman@xxxxxxxxxx> Applied to cgroup/for-5.17. Thanks. -- tejun
