Somebody convince me that tags for scheduling and process (or operating-system, or similar) wouldn't be just as good. Go on, let's hear it.
Process scheduling in the OS is a most special special case of general scheduling problems in that you can assume lots of nice things. I guess you could remove process-scheduling in favor of scheduling + operating-systems; I think that people looking for (general) scheduling problems would perceive such questions as noise, though. From what I remember of the scheduling theory lecture I took and what people ask under process-scheduling, these are two different and largely separate worlds. Therefore I created the tag, and vote for it to stay.