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SubjectWriting "+pids" to cgroup.subtree_control flie yields EINVAL
Hello Tejun,

I was trying to do some simple testing ot the CPU controller
that is merged into 4.15, and ran immediately into some confusion.
In the root cgroup on a freshly booted 4.150-rc1, I try the following:

# pwd
# echo '+cpu' > cgroup.subtree_control
sh: echo: write error: Invalid argument

What am I missing> I presume I'm missing something obvious, although
nothing jumped out at me as I read the cgroups-v2.txt file.



Michael Kerrisk
Linux man-pages maintainer;
Linux/UNIX System Programming Training:

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