Now we have no any hotplug dynamic mechanism on Hikey960 (such like hotplug governor); the system keeps to run 8 cores simultaneously. So I don’t know clearly what’s your question meaning.
For what it worth, you could use command to hotplug off any specific CPU and hotplug in it again:
echo 0 > /sys/devices/system/cpu/cpuX/online
echo 1 > /sys/devices/system/cpu/cpuX/online
You could adjust the “sustainable_power” to a bigger value so can loose thermal throttling for CPU frequency; if you set “99999999” to sustainable power, this can let thermal framework doesn’t impose limitation on CPU frequency:
echo 99999999 > /sys/class/thermal/thermal_zone0/sustainable_power