Ubuntu Swapper：如何诊断问题

?Ubuntu???,swapper??????CPU???????????????,????????swapper?????,?????????swap??????????????????????????:

??Swapper????

• ??SystemTap??Swapper??:

  • ??SystemTap:SystemTap????
  • ??????swapper??:

    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)
    }
    

    ?????????,???CPU??????????,?????swapper???????

??Swap????

• ?????Swappiness?:

  • ????swappiness?:

    cat /proc/sys/vm/swappiness
    

  • ????swappiness??10:

    sudo sysctl vm.swappiness=10
    

  • ???????,??/etc/sysctl.conf??,????????:

    vm.swappiness=10
    

• ??Swap?????????:

  • ??/etc/sysctl.conf??,????????:

    vm.min_free_kbytes=250000
    

    ???????RAM?????????swap???

????????

• ??top?htop?????????????
• ??systemd-analyze blame??????????,??????????

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