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We allocated the names set for each unit, but in the majority of cases, we'd put only one name in the set: $ systemctl show --value -p Names '*'|grep .|grep -v ' '|wc -l 564 $ systemctl show --value -p Names '*'|grep .|grep ' '|wc -l 16 So let's add a separate .id field, and only store aliases in the set, and only create the set if there's at least one alias. This requires a bit of gymnastics in the code, but I think this optimization is worth the trouble, because we save one object for many loaded units. In particular set_complete_move() wasn't very useful because the target unit would always have at least one name defined, i.e. the optimization to move the whole set over would never fire.
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