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Include the current pid in the classid cgroup path. This way, different testers relying on classid-based configurations will have distinct classid cgroup directories, enabling them to run concurrently. Additionally, we leverage the current pid as the classid, ensuring unique identification. Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Link: https://lore.kernel.org/r/20231111090034.4248-4-laoar.shao@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>