Ubuntu Swapper：如何诊断Swapper问题

??Ubuntu????Swapper????????????:

??Systemtap????

1. ??Systemtap:

• ????????Systemtap???????,????Systemtap?????????

2. ???????:

• ??Systemtap??????,????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)
}

• ??????????CPU?????,??idle?1,??CPU??????,???Swapper??????

??Swapper??

1. ??Swapper????:

• ????????Swapper?????:

sudo swapon --show

• ??????Swapper???????,??????????????????

2. ??Swapper????:

• ??Swapper????????????,Swapper?????????????????????????8GB,Swapper????????????

??ACPI????

1. ???????:

• ?????????ACPI??,???????????,??ACPI:

sudo systemctl isolate multi-user.target
sudo systemctl stop gdm
sudo reboot

• ?GRUB???????acpi=off,????GRUB???:

sudo vi /etc/default/grub
# ?GRUB_CMDLINE_LINUX_DEFAULT??? acpi=off
sudo update-grub
sudo reboot

????????

1. ???????:

• ????Ubuntu?????,???????????,?????????e?,??quiet splash???nomodeset,???f10?????????

2. GRUB????:

• ????GRUB????,??????GRUB????:

sudo vi /etc/default/grub
# ??GRUB_DEFAULT?,?????1
sudo update-grub
sudo reboot

??????,???????????Ubuntu????Swapper???????????,????????????????