diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-05-06 10:54:07 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-05-06 10:54:07 +0200 |
| commit | 4566e2dd4a12a0c0288e97a079dc4e1eed436800 (patch) | |
| tree | a50d4a1661f8fc1c20c1ea4ccfc3d133b5354c67 /Documentation/ABI/testing/sysfs-devices-system-cpu | |
| parent | 5a28654cc0e616e129ea23d353d8bed5babb8b31 (diff) | |
| parent | c208ac8f8f862dba7b01eb54557f4803b3c17296 (diff) | |
Merge branch 'pm-x86'
* pm-x86:
x86: tsc: Rework time_cpufreq_notifier()
admin-guide: pm: intel_epb: Add SPDX license tag and copyright notice
PM / arch: x86: MSR_IA32_ENERGY_PERF_BIAS sysfs interface
PM / arch: x86: Rework the MSR_IA32_ENERGY_PERF_BIAS handling
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-cpu')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 9605dbd4b5b5..7f4af7da3fbc 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -518,3 +518,21 @@ Description: Control Symetric Multi Threading (SMT) If control status is "forceoff" or "notsupported" writes are rejected. + +What: /sys/devices/system/cpu/cpu#/power/energy_perf_bias +Date: March 2019 +Contact: linux-pm@vger.kernel.org +Description: Intel Energy and Performance Bias Hint (EPB) + + EPB for the given CPU in a sliding scale 0 - 15, where a value + of 0 corresponds to a hint preference for highest performance + and a value of 15 corresponds to the maximum energy savings. + + In order to change the EPB value for the CPU, write either + a number in the 0 - 15 sliding scale above, or one of the + strings: "performance", "balance-performance", "normal", + "balance-power", "power" (that represent values reflected by + their meaning), to this attribute. + + This attribute is present for all online CPUs supporting the + Intel EPB feature. |