https://news.ycombinator.com/item?id=29993772
https://utcc.utoronto.ca/~cks/space/blog/linux/SystemdDynamicUserLimits
https://archive.is/wip/u6v9s
https://utcc.utoronto.ca/~cks/space/blog/linux/SystemdFairshareScheduling
https://unix.stackexchange.com/questions/289629/systemd-restart-always-is-not-honored