On a related note, when I came in to work today my workstation had been slowed to a crawl. Turns out Clementine (music player) had decided to allocate a ridiculous amount of memory, something it
sometimes does for reason's I don't know ... so I had systemd put it in a cgroup and limit its memory. Which fairly quickly swapped it out, making everything fast again. So systemd dramatically increased my swap usage... and I'm happy about it.