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Two new calls on the Unit interface (Ref() and Unref()), plus the matching calls on the Manager interface (RefUnit() and UnrefUnit()) permit influencing the GC logic of systemd units, and make sure that units are not GC'ed right-away after they exited. A new pseudo-property AddRef is also added that may be specified when a transient unit is created, so that a Ref() and a StartTransientUnit() call may be combined atomically.\r\n\r\nThis is ref counting concept deals with a long-standing problem of the GC logic: a service that exited cleanly would likely be cleaned up immediately, thus losing all runtime information, such as CPU times and suchlike. With the new GC logic a client may now pin a unit into memory, thus ensuring the that exit status information can still be read before the unit is cleaned up.\r\n\r\nNote that ref counting is only opened up to privileged clients, so that unprivileged clients cannot pin units into memory unbounded.\r\n\r\nThis PR includes a patch that extends \"systemd-run\" with a new \"--wait\" switch that makes use of this. When specified, systemd-run will wait for the created service to finish and show terse information about its runtime. This is particularly useful to see the consumed CPU time and such. 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