What is the power consumption of Power Monitors while monitoring the power consumption of CPU or GPU?

What is the power consumption of Power Monitors while monitoring the power consumption of CPU or GPU? Does it use CPU power only?

hello mxh170530,

there’re several different rails,
for example,

# cat /sys/bus/i2c/drivers/ina3221x/0-0040/iio:device0/rail_name_0
VDD_SYS_GPU
# cat /sys/bus/i2c/drivers/ina3221x/0-0041/iio:device1/rail_name_1
VDD_SYS_CPU

for the more details,
please also check developer guide, Software-Based Power Consumption Modeling for reference.
you should also check the information from the INA3221 power monitor, which can be read using sysfs nodes.
thanks