[PATCH 0/2] cpufreq: ondemand: add AMD specific powersave bias

From: Jacob Shin
Date: Wed Mar 27 2013 - 18:37:59 EST

This patchset adds AMD specific powersave bias function to the ondemand
governor; which can be used to help ondemand governor make more power conscious
frequency change decisions based on feedback from hardware (availble on AMD
Family 16h and above).

Hardware feedback tells software how "sensitive" to frequency changes the
workloads are. CPU-bound workloads will be more sensitive -- they will
perform better as frequency increases. Memory/IO-bound workloads will be less
sensitive -- they will not necessarily perform better as frequnecy increases.

This patchset was compared against ondemand governor without powersave bias
and did not show any performance degradation on CPU-bound workloads such as
kernbench and unixbench. While saving power on Memory-bound workloads such as

This applies to linux-pm's linux-next branch, on top of Viresh's 'Implement
per policy instance of governor' V4 patchset:


Jacob Shin (2):
cpufreq: ondemand: allow custom od_ops to be registered
cpufreq: AMD "frequency sensitivity feedback" powersave bias for
ondemand governor

arch/x86/include/uapi/asm/msr-index.h | 1 +
drivers/cpufreq/Kconfig.x86 | 10 ++++++++++
drivers/cpufreq/Makefile | 1 +
drivers/cpufreq/cpufreq_governor.h | 2 ++
drivers/cpufreq/cpufreq_ondemand.c | 32 +++++++++++++++++++++++++++-----
5 files changed, 41 insertions(+), 5 deletions(-)


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