DevinLeamy opened a new pull request, #562:
URL: https://github.com/apache/mesos/pull/562

   The control 'cgroup.type' contains the type of a cgroup. Cgroups are either 
'threaded' or 'domain'. Threaded cgroups can contain threads in internal 
cgroups but can only enable the "cpu", "cpuset", "perf_event", and "pids" 
controllers. Domain cgroups cannot contain internal processes but can enable 
any controller.
   
   In cgroups v2, container pids are to be placed exclusively in "leaf" cgroups 
in the cgroup hierarchy. Controllers should not be enabled in "leaf" cgroups 
and they should not have any child cgroups. To help enforce these constraints, 
we will make "leaf cgroups" threaded, hence this commit which extends our 
library to allow us to make a cgroup threaded.


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