sysctl_cpu_idle_cnt
0, CPU_IDLE_STAT_HALT, sysctl_cpu_idle_cnt, "Q", "Idle loop entry halts");
0, CPU_IDLE_STAT_SPIN, sysctl_cpu_idle_cnt, "Q", "Idle loop entry spins");
i, sysctl_cpu_idle_cnt, "Q", "# of times entered");