upstart is used by the current release of RHEL, but it's true that Red Hat has signaled that systemd will come to RHEL as well (Fedora now comes with systemd as

upstart is used by the current release of RHEL, but it's true that Red Hat has signaled that systemd will come to RHEL as well (Fedora now comes with systemd as far as I know). I don't see the problem with then using whatever they want, if it provides a good solution, when upstart was developed systemd wasn't even a viable alternative, for me it still is not if stability is what you want and run on a non-desktop system. Exploring Android internals I much SurfaceFlinger than X in my understanding of its architecture.