In a round-robin scheduler, adding a process multiple times to the process list is a cheap way to give it higher priority.
I wonder how practical an approach this might be. What benefit does it have over other techniques such as giving the process a longer time slice (benefit: less switching time) or maintaining a separate list of high-priority processes. In particular, how does listing a process multiple times influence fairness and reactivity?
(From exercise 2.16 in Andrew Tanenbaum's Operating Systems: Design and Implementation 1st ed.)