英文:
What is the difference between cgroups freeze and linux command "Kill - STOP pid" in golang?
问题
我使用这个cgroups包。
我对type Cgroup中的两个接口感兴趣。一个是Freeze() error，另一个是Thaw() error。它们的描述如下：
...
// Freeze冻结或暂停cgroup中的所有进程
Freeze() error
// Thaw解冻或恢复cgroup中的所有进程
Thaw() error
...
还有两个Linux命令可以暂停和恢复进程，分别是kill -STOP pid和kill -CONT pid。
我想知道如果一个cgroup中只有一个进程，使用这两种方式来暂停和恢复进程是否有任何区别？谢谢。
英文:
I use this cgroups package.
There are two interfaces I am interested in for type Cgroup. The one is Freeze() error and the other is Thaw() error.The description of them is as follows:
...
// Freeze freezes or pauses all processes inside the cgroup
Freeze() error
// Thaw thaw or resumes all processes inside the cgroup
Thaw() error
...
And there are two linux command that can pause and resume a process, which is kill -STOP pid and kill -CONT pid.
I wonder that if there is only one process in a cgroup, does it has any difference between these two ways to pause and resume the process? Thanks.
答案1
得分: 0
这两个状态是在2016年10月引入的，containerd/cgroups提交b3f3344中提到，并且与cgroup v1 self-state相关。
> cgroup冻结是分层的。
>
> 冻结一个cgroup会冻结属于该cgroup及其子cgroup的所有任务。
每个cgroup都有自己的状态（self-state）和从父级继承的状态（parent-state）。
当且仅当这两个状态都是THAWED时，cgroup才是THAWED。
CGroup Freezer 状态：
> freezer.state 只在非根cgroup中可用，有三个可能的值：
> - FROZEN — cgroup中的任务被挂起。
>- FREEZING — 系统正在挂起cgroup中的任务。
>- THAWED — cgroup中的任务已恢复。
含义（这里）：
> 冻结子系统用于挂起和恢复cgroup中的进程。
>
> 冻结器有一个控制文件：freezer.state，将FROZEN写入该文件，可以挂起cgroup中的进程，将THAWED写入该文件，可以恢复挂起的进程。
英文:
Both states were introduced in oct. 2016 in containerd/cgroups commit b3f3344 and refer to cgroup v1 self-state
> The cgroup freezer is hierarchical.
>
> Freezing a cgroup freezes all tasks beloning to the cgroup and all its descendant cgroups.
Each cgroup has its own state (self-state) and the state inherited from the parent (parent-state).
Iff both states are THAWED, the cgroup is THAWED.
CGroup Freezer states:
> freezer.state is only available in non-root cgroups and has three possible values:
> - FROZEN — tasks in the cgroup are suspended.
>- FREEZING — the system is in the process of suspending tasks in the cgroup.
>- THAWED — tasks in the cgroup have resumed.
Meaning (here):
> The freezer subsystem is used to suspend and resume processes in the cgroup.
>
>Freezer has a control file: freezer.state, write FROZEN to this file, you can suspend the process in the cgroup, and write THAWED to this file, you can resume the suspended process.
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