What: /sys/class/powercap/ Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: The powercap/ class sub directory belongs to the power cap subsystem. Refer to Documentation/power/powercap/powercap.rst for details. What: /sys/class/powercap/ Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: A is a unique name under /sys/class/powercap. Here determines how the power is going to be controlled. A can contain multiple power zones. What: /sys/class/powercap//enabled Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: This allows to enable/disable power capping for a "control type". This status affects every power zone using this "control_type. What: /sys/class/powercap// Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: A power zone is a single or a collection of devices, which can be independently monitored and controlled. A power zone sysfs entry is qualified with the name of the . E.g. intel-rapl:0:1:1. What: /sys/class/powercap/// Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Power zones may be organized in a hierarchy in which child power zones provide monitoring and control for a subset of devices under the parent. For example, if there is a parent power zone for a whole CPU package, each CPU core in it can be a child power zone. What: /sys/class/powercap/...//name Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Specifies the name of this power zone. What: /sys/class/powercap/...//energy_uj Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Current energy counter in micro-joules. Write "0" to reset. If the counter can not be reset, then this attribute is read-only. What: /sys/class/powercap/...//max_energy_range_uj Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Range of the above energy counter in micro-joules. What: /sys/class/powercap/...//power_uw Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Current power in micro-watts. What: /sys/class/powercap/...//max_power_range_uw Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Range of the above power value in micro-watts. What: /sys/class/powercap/...//constraint_X_name Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Each power zone can define one or more constraints. Each constraint can have an optional name. Here "X" can have values from 0 to max integer. What: /sys/class/powercap/...//constraint_X_power_limit_uw Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Power limit in micro-watts should be applicable for the time window specified by "constraint_X_time_window_us". Here "X" can have values from 0 to max integer. What: /sys/class/powercap/...//constraint_X_time_window_us Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Time window in micro seconds. This is used along with constraint_X_power_limit_uw to define a power constraint. Here "X" can have values from 0 to max integer. What: /sys/class/powercap//.../constraint_X_max_power_uw Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Maximum allowed power in micro watts for this constraint. Here "X" can have values from 0 to max integer. What: /sys/class/powercap//.../constraint_X_min_power_uw Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Minimum allowed power in micro watts for this constraint. Here "X" can have values from 0 to max integer. What: /sys/class/powercap/...//constraint_X_max_time_window_us Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Maximum allowed time window in micro seconds for this constraint. Here "X" can have values from 0 to max integer. What: /sys/class/powercap/...//constraint_X_min_time_window_us Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: Minimum allowed time window in micro seconds for this constraint. Here "X" can have values from 0 to max integer. What: /sys/class/powercap/...//enabled Date: September 2013 KernelVersion: 3.13 Contact: linux-pm@vger.kernel.org Description: This allows to enable/disable power capping at power zone level. This applies to current power zone and its children.