"Aggressive" processes that for one reason or another escape well-mannered foreground supervision; for example, often those that daemonize themselves incorrectl

"Aggressive" processes that for one reason or another escape well-mannered foreground supervision; for example, often those that daemonize themselves incorrectly. Either they don't generate PID files correctly, or they don't cleanup after old PID files leaving them dangling, or they have useless PID files that point to the incorrect child processes that can't do useful work when they receive signals to reload/shutdown themselves safely. Handling those daemons by jailing them with Linux-centric cgroups is the one thing systemd allows you to "get away with".