systemd cgroup delegation and control processes
summary
A simple patch adds a new unit directive that explicitly places control processes into a chosen delegated cgroup and lets the unit specify where its payload lives, so reload/exec commands stop creating sidecar wrapper cgroups; it flips the delegated subtree into threaded mode when needed to satisfy the internal-node constraint, handles mixed threaded/non-threaded controllers (CPUs vs memory), and lands as a systemd pull request that tests clean creation of the requested hierarchy.
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chapters (10)
- 0:00Introduction to cgroups
- 1:48Delegation concept explained
- 2:54Service processes hierarchy
- 6:36Internal node constraint issue
- 8:26Threaded vs non-threaded controllers
- 10:55Control process placement problems
- 12:00Proposed solution for delegation
- 14:05Example of user instance service
- 15:30Alternative approaches discussed
- 16:13Discussion and questions
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