Precisions about Enable_mem_cg variable

[mneveu-mx]

In the code, at job_resource_manager_cgroups.pl , the variable : $Enable_mem_cg is set to "NO". There is a commentary on the code that suggest some problems if it is set at "YES".
What is the problem suggested ?

I know there is limitations on cgroupsv1 with OOM-killer that can create a specific situation where all process on a cgroup can be killed and this situation don't stop the cgroup reservation.
Is it the problem suggested on the code ?