top맨페이지 에 따르면 :
16. PR -- Priority
The scheduling priority of the task. If you see `rt' in this
field, it means the task is running under real time scheduling priority.
Under linux, real time priority is somewhat misleading since
traditionally the operating itself was not preemptible. And while the 2.6
kernel can be made mostly preemptible, it is not always so.
실시간 우선순위를 갖도록 실행 중인 프로세스를 변경해 보았습니다.
$ sudo chrt -f -p 1 2179
$ chrt -m
SCHED_OTHER min/max priority : 0/0
SCHED_FIFO min/max priority : 1/99
SCHED_RR min/max priority : 1/99
SCHED_BATCH min/max priority : 0/0
SCHED_IDLE min/max priority : 0/0
SCHED_DEADLINE min/max priority : 0/0
$ chrt -p 2179
pid 2179's current scheduling policy: SCHED_FIFO
pid 2179's current scheduling priority: 1
$
하지만 top보여줘
Tasks: 255 total, 3 running, 252 sleeping, 0 stopped, 0 zombie
%Cpu(s): 4.4 us, 0.3 sy, 0.0 ni, 95.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 19658969+total, 19371019+free, 2405528 used, 473984 buff/cache
KiB Swap: 4194300 total, 4194300 free, 0 used. 19352804+avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2179 myuser -2 0 25552 2892 2648 R 100.0 0.0 67:16.22 my_application
-2가 우선순위로 표시됩니다. 그래야만 하는가 rt?
migration/0나는 우선 순위 와 같은 흐름을 봅니다 rt.