CP_IDLE
cpu_states[CP_IDLE] += cputime_percpu[cpu].cp_idle;
cpu_states[CP_IDLE] = cputime_percpu[cpu].cp_idle;
cpu_states[CP_IDLE] += cputime_percpu[n].cp_idle;
(cpu_states[CP_IDLE] + lsb) * 10000 / acc);