definitely micro-kernel (something like L4 OS). Also we should be able to isolate process from each other as if they are running inside a true VM. For example:

definitely micro-kernel (something like L4 OS). Also we should be able to isolate process from each other as if they are running inside a true VM. For example: one process trying to use all the memory on the machine should evict its own memory page from memory and try to swap them to disk but not evict memory page of other process.