+* transient units: allow creating auxiliary units with the same call
+
+* make BlockIODeviceWeight=, BlockIODeviceBandwidth= runtime settable
+
+* split up BlockIOWeight= and BlockIODeviceWeight=
+
+* how to reset dynamically changed attributes sanely?
+
+* when reloading configuration, apply new cgroup configuration
+
+* implement system-wide DefaultCPUAccounting=1 switch (and similar for blockio, memory?)
+
+* implement per-slice CPUFairScheduling=1 switch
+
+* handle jointly mounted controllers correctly
+
+* split out CreateMachine into systemd-machined
+
+* introduce new Scope unit type then make logind's session and machine
+ registration use this to set up cgroups
+
+* should Slice= be part of [Unit] or of [Service]?
+
+* journald: make sure ratelimit is actually really per-service with the new cgroup changes
+