| 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.txt for details. | |
| What: /sys/class/powercap/<control type> | |
| Date: September 2013 | |
| KernelVersion: 3.13 | |
| Contact: linux-pm@vger.kernel.org | |
| Description: | |
| A <control type> is a unique name under /sys/class/powercap. | |
| Here <control type> determines how the power is going to be | |
| controlled. A <control type> can contain multiple power zones. | |
| What: /sys/class/powercap/<control type>/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/<control type>/<power zone> | |
| 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 <control type>. | |
| E.g. intel-rapl:0:1:1. | |
| What: /sys/class/powercap/<control type>/<power zone>/<child power zone> | |
| 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/.../<power zone>/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/.../<power zone>/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/.../<power zone>/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 zone>/power_uw | |
| Date: September 2013 | |
| KernelVersion: 3.13 | |
| Contact: linux-pm@vger.kernel.org | |
| Description: | |
| Current power in micro-watts. | |
| What: /sys/class/powercap/.../<power zone>/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/.../<power zone>/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/.../<power zone>/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/.../<power zone>/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/<control type>/.../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/<control type>/.../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/.../<power zone>/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/.../<power zone>/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/.../<power zone>/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. |