Question

What policies are used by linux to schedule a real time task?

Answer 1

Answer:

Linux provides two real-time scheduling policies, SCHED_FF and SCHED_RR. The normal, not real-time scheduling policy is SCHED_OTHER. SCHED_FIFO implements a simple first-in, first-out scheduling algorithm without timeslices. A runnable SCHED_FIFO task will always be scheduled over any SCHED_OTHER tasks. When a SCHED_FIFO task becomes runnable, it will continue to run until it blocks or explicitly yields the processor; it has no timeslice and can run indefinitely. Two or more SCHED_FIFO tasks at the same priority run round robin.