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.
