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

I'm not an expert for scheduling schemes, but have a look at

man sched_setscheduler

it details what the difference between the different scheduling algorithms are, and provide links to other scheduling functions. SCHED_FIFO actually sounds pretty dangerous, but is described as the most aggressive scheduling:

A SCHED_FIFO process runs until either it is blocked by an I/O request, it is preempted by a higher priority process, or it calls sched_yield(2).

Beware not to lock up your system. I would personally do some empirical tests to see what priority fits the best and how they behave exactly.