How Debian managed the systemd transition

Note, though, that if the overhead could be entirely eliminated (context switches included) there *are* things I'd love to see moved out of the kernel. The vast majority of filesystems, for instance: a giant pile of C code, running at the highest possible security level, used to parse what should be arbitrary untrusted data, that we're increasingly exposing to arbitrary unprivileged userspace. There's no good reason for, for instance, isofs, freevxfs, or hfs to live in the kernel.