linux - Low priority FIFO process running along with High priority FIFO process -


i'm working on linux kernel , required change process' scheduling policy fifo. changed processes' default scheduling policy fifo through source code. policy's actual behavior says higher priority (99) process won't preempt, lower priority (1) processes running along it. after research, i've changed sysctl_sched_rt_runtime -1, still high priority processes getting preempted. can tell me way run 1 fifo process @ time , disabling lower priority fifo process preempt higher priority fifo process. need increase cpu usage of user process manually ? or related cgroups or prevention in kernel need bypass? please !!

ubuntu version - 16.04 lts kernel- 4.9.y


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