CPUs can be isolated via cgroup settings and turbostat should avoid migrating to these CPUs, just like it does for the '-c' cpus. Introduce cpu_effective_set to save the cgroup cpu limitation info from /sys/fs/cgroup/cpuset.cpus.effective. And use cpu_allowed_set as the intersection of cpu_present_set, cpu_effective_set and cpu_subset. Signed-off-by: Zhang Rui <rui.zhang@intel.com>