Q: changing real time process priority in Linux ..? My query is regarding engineering the priority value of a process. In my system, process A is running in RR at priority 83. Now I have another process B in RR, I want B's priority to be higher than A (i.e. I want B to be scheduled always compared to A). 
To do this, what value should I choose for B. I have read in code that there is a penalty/bonus of 5 depending upon process's history. 
Also, If I choose value 84 Or 85, is there any chance in some situations that my process is ignored.
Please help in engineering this value.

A: Now I got it. Real time tasks(FF/RR) are not governed by penalty/bonus rules. With O(1) scheduler, task with higher priority will be chosen. In my case process B will be scheduled if its priority is greater than process A.
Penalty/bonus is for SCHED_OTHER/SCHED_NORMAL. 
