Re: [External] Re: [PATCH] cgroup/cpuset: Add a new isolated mems.policy type.

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Back to the previous question.
The question is how to implement that with a sensible semantic.

Thanks for your analysis and suggestions.It is really difficult to add
policy directly to cgroup for the hierarchical enforcement. It would be a good idea to add pidfd_set_mempolicy.

Are you going to pursue that path?

Hi Michal, thanks for your suggestion and reply.

 > Are you going to pursue that path?

Yes,I'll give it a try as it makes sense to modify the policy dynamically.

Thanks.

Hi Michal, i have a question about pidfd_set_mempolicy, it would be better if you have some suggestions.

The task_struct of processes and threads are independent. If we change the mempolicy of the process through pidfd_set_mempolicy, the mempolicy of its thread will not change. Of course users can set the mempolicy of all threads by iterating through /proc/tgid/task.

The question is whether we should override the thread's mempolicy when setting the process's mempolicy.

There are two options:
A:Change the process's mempolicy and set that mempolicy to all it's threads.
B:Only change the process's mempolicy in kernel. The mempolicy of the thread needs to be modified by the user through pidfd_set_mempolicy in
userspace, if necessary.

Thanks.




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