On Linux SCHED_FIFO and SCHED_RR

Question

I\'m writing a a very small daemon that must remain responsive even when a system is under severe stress. I\'m looking at the differences between SCHED_FIFO and SCHED_RR in

Answer 1

SCHED_FIFO can't be preempted (context switched to another process) unless another process of higher priority shows up in the execution queue.

SCHED_RR can be preempted by a time quantum (delay given to a process to execute).

They are both "real-time" priorities of linux based schedulers.