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Syscall name_to_handle_at() can be used to get cgroup id for a particular cgroup path in user space. The selftest got cgroup id from both user and kernel, and compare to ensure they are equal to each other. Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>