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Previously, in the service unit type we ran all control processes in a special subcgroup /control of the unit's main cgroup. Remove that, and run the control program in the main cgroup instead. The concept conflicts with cgroupv2's logic of "no processes in inner nodes": if a unit has a main daemon process running in the main cgroup, and a reload control process would be started in the /control subcgroup, then this would necessarily fail, as the main daemon process would become an inner node process that way. We could in theory continue to support this in cgroupv1, but in the interest in keeping behaviour similar in both hierarchies, let's drop this altogether. Philosophically maybe it wasn't the greatest idea anyway to just go berserk and SIGKILL all those processes — loud warning logging might have sufficed, too.
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