253d0d591b
For a user, information which cgroup controllers are enabled based on the unit configuration is rather important. Not only because it determines what resource control is peformed by the kernel, but also because controllers have a non-negligible cost, especially for deep nesting, and users may want to *not* have controllers enabled. Our documentation did its best to avoid the topic so far. This was partially caused by the support for cgroup v1, which meant that any discussion of controllers had to be conditional and messy. But v1 is deprecated on its way out, so it should be fine to just describe what happens with v2. The text is extended with a discussion of how controllers are enabled and disabled, and an example, and for various settings that enable controllers the relevant controller is now mentioned.
System and Service Manager
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