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- 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.
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