invokes systemd-mount and exits. This is then useful to use in
ENV{SYSTEMD_WANTS} in udev rules, and a bit prettier than using RUN+=
+* udevd: extend memory pressure logic: also kill any idle worker processes
+
+* SIGRTMIN+18 and memory pressure handling should still be added to: hostnamed,
+ localed, oomd, timedated.
+
* sd-journal puts a limit on parallel journal files to view at once. journald
should probably honour that same limit (JOURNAL_FILES_MAX) when vacuuming to
ensure we never generate more files than we can actually view.