Merge tag 'pm-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

[tomoyo/tomoyo-test1.git] / Documentation / ABI / testing / sysfs-devices-system-cpu

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 5eea46f..4fb76c0 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -520,3 +520,21 @@ 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.