Ubuntu Swapper如何测试

?Ubuntu???,swapper??????CPU??????????????????????swapper??????,????systemtap??????????????????????:

????

1. ??????:???????Ubuntu??,??Ubuntu 16.04.4 LTS?
2. SystemTap:?????????????,???????????????????SystemTap?

??SystemTap

????SystemTap???????SystemTap????????:

sudo apt-get update
sudo apt-get install systemtap

?????SystemTap??

1. ????:??probe::scheduler.cpu_off???CPU??????????????:

probe scheduler.cpu_off {
    printf(" s (]) %5s  s (]) , is idle:%d \n ",
           task_execname(task_prev), task_pid(task_prev), "==>",
           task_execname(task_next), task_pid(task_next), idle)
}

2. ????:????????swapper_test.stp,????SystemTap???:

sudo stap swapper_test.stp

??????

?????CPU?????????,???idle?????idle?1,??CPU??????,????swapper???

????

swapper/0 ( 0) ==> stapio (29159) , is idle:1
stapio (29159) ==> swapper/0 ( 0) , is idle:0
swapper/0 ( 0) ==> rcu_sched ( 7) , is idle:1
rcu_sched ( 7) ==> swapper/0 ( 0) , is idle:0
...

????????,?????swapper????????????

????

• ??????:??SystemTap????????????????,???????????
• ???????:??????SystemTap????????????

??????,???????????Ubuntu????swapper??,??????????????????