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cpufreq: conservative: Fix sampling_down_factor functionality

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sampling_down_factor tunable is unused since commit
8e677ce83b (4 years ago).

This patch restores the original functionality and documents the
tunable.

Signed-off-by: Stratos Karafotis <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Stratos Karafotis 2013-03-05 22:06:29 +00:00 • committed by Rafael J. Wysocki
commit 7af1c0568d
2 changed files with 14 additions and 3 deletions
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6
Documentation/cpu-freq/governors.txt
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@ -191,6 +191,12 @@ governor but for the opposite direction. For example when set to its
default value of '20' it means that if the CPU usage needs to be below
20% between samples to have the frequency decreased.
sampling_down_factor: similar functionality as in "ondemand" governor.
But in "conservative", it controls the rate at which the kernel makes
a decision on when to decrease the frequency while running in any
speed. Load for frequency increase is still evaluated every
sampling rate.
3. The Governor Interface in the CPUfreq Core
=============================================