The freezer subsystem suspends or resumes tasks in a cgroup.
freezer.state
freezer.state has three possible values:
FROZEN — tasks in the cgroup are suspended.
FREEZING — the system is in the process of suspending tasks in the cgroup.
1. Move that process to a cgroup in a hierarchy which has the freezer subsystem attached to it.
将这个任务 attack 进 test :
观察cpu 使用率,可见迅速递减。
freezer.state
freezer.state has three possible values:
FROZEN — tasks in the cgroup are suspended.
FREEZING — the system is in the process of suspending tasks in the cgroup.
T HAWED — tasks in the cgroup have resumed.
1. Move that process to a cgroup in a hierarchy which has the freezer subsystem attached to it.
2. Freeze that particular cgroup to suspend the process contained in it.
It is not possible to move a process into a suspended (frozen) cgroup.
Note that while the FROZEN and T HAWED values can be written to freezer.state,
FREEZING cannot be written, only read.
创建一个任务
sina@ubuntu:~$ ./a.out &
[1] 9343
将这个任务 attack 进 test :
root@ubuntu:/sys/fs/cgroup/freezer/test# echo 9343 > tasks
把任务的状态设置为 FROZEN
root@ubuntu:/sys/fs/cgroup/freezer/test# echo FROZEN > freezer.state
观察cpu 使用率,可见迅速递减。