CPU values get reset when CPU goes offline/online

[myllynen]

CPU values get reset when CPU first goes offline and then comes back online:

# pmrep -i cpu3 -r -s 1 kernel.percpu.cpu.idle
  k.p.c.idle
        cpu3
    millisec
     1180890
# echo 0 > /sys/devices/system/cpu/cpu3/online
# echo 1 > /sys/devices/system/cpu/cpu3/online
# pmrep -i cpu3 -r -s 1 kernel.percpu.cpu.idle
  k.p.c.idle
        cpu3
    millisec
        1400

Recent iostat(1) versions avoid these resets but perhaps both approaches have their pros and cons.