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These operations might require slow I/O, and thus might block PID1's main loop for an undeterminated amount of time. Instead of performing them inline, fork a worker process and stash away the D-Bus message, and reply once we get a SIGCHILD indicating they have completed. That way we don't break compatibility and callers can continue to rely on the fact that when they get the method reply the operation either succeeded or failed. To keep backward compatibility, unlike reload control processes, these are ran inside init.scope and not the target cgroup. Unlike ExecReload, this is under our control and is not defined by the unit. This is necessary because previously the operation also wasn't ran from the target cgroup, so suddenly forking a copy-on-write copy of pid1 into the target cgroup will make memory usage spike, and if there is a MemoryMax= or MemoryHigh= set and the cgroup is already close to the limit, it will cause an OOM kill, where previously it would have worked fine.
System and Service Manager
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