--- Documentation/cpu-freq/governors.txt

+++ Documentation/cpu-freq/governors.txt

@@ -28,6 +28,7 @@ Contents:

2.3 Userspace

2.4 Ondemand

2.5 Conservative

+2.6 SmartassV2

3. The Governor Interface in the CPUfreq Core

@@ -193,6 +194,38 @@ governor but for the opposite direction.

default value of '20' it means that if the CPU usage needs to be below

20% between samples to have the frequency decreased.

+2.6 SmartassV2

+---------------

+

+The CPUfreq governor "smartassV2", like other governors, aims to balance

+performance vs battery life by using low frequencies when load is low and

+ramping the frequency when necessary, fast enough to ensure responsiveness.

+

+The implementation of the governor is roughtly based on the idea of interactive.

+The idle loop is used to track when the CPU has idle cycles. The idle loop will

+set a relatively high rate timer to sample the load when appropriate, the timer

+will measure the load since it was set and schedule a work queue task to do the

+actual frequency change when necessary.

+

+The most important tunable is the "ideal" frequency: this governor will aim

+for this frequency, in the sense that it will ramp towards this frequency much

+more aggresively than beyond it - both when ramping up from below this frequency

+and when ramping down from above this frequency. Still, note, that when load is

+low enough the governor should choose the lowest available frequency regardless

+of the ideal frequency and similarly when load is consistently high enough the

+highest available frequency will be used.

+

+Smartass also tracks the state of the screen, and when screen is off (a.k.a

+sleep or suspended in the terms of this governor) a different ideal frequency

+is used. This is the only difference between the screen on and screen off

+states. Proper tuning of the awake_ideal_freq and sleep_ideal_freq should

+allow both high responsiveness when screen is on and utilizing the low

+frequency range when load is low, especially when screen is off.

+

+Finally, smartass is a highly customizable governor with almost everything

+tweakable through the sysfs. For a detailed explaination of each tunable,

+please see the inline comments at the begging of the code (smartass2.c).

+

3. The Governor Interface in the CPUfreq Core

=============================================