c groups

https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt

https://developer.ibm.com/hadoop/2017/06/30/deep-dive-yarn-cgroups/

https://www.linuxjournal.com/content/everything-you-need-know-about-linux-containers-part-i-linux-control-groups-and-process

https://sysadmincasts.com/episodes/14-introduction-to-linux-control-groups-cgroups

https://lwn.net/Articles/679786/