It’s a method to put processes into groups by allowing the Following:
Resource limitation: groups can be set to not exceed a configured memory limit, which also includes the file system cache.
Prioritization: some groups may get a larger share of CPU utilization or disk I/O throughput.
Accounting: measures how much resources certain systems use, which may be used, for example, for billing purposes.
Control: freezing the groups of processes, their checkpointing and restarting
Each cgroup is represented by a directory in the cgroup file system containing the following files describing that cgroup:
Tasks: list of tasks (by PID) attached to that cgroup.
Cgroup.procs: list of thread group IDs in the cgroup.
Notify_on_release flag: run the release agent on exit?
- Release_agent: the path to use for release notifications (this file exists in the top cgroup only).