Module cpufreq 

CPU Frequency Scaling via MSR for x86_64.

Controls CPU P-states (performance states) through the IA32_PERF_CTL and IA32_PERF_STATUS MSRs. Supports three governors:

• Performance: fixed at maximum frequency
• Powersave: fixed at minimum frequency
• Ondemand: dynamic scaling based on CPU utilization (integer math)

P-state ratios are read from MSR_PLATFORM_INFO (0xCE) which provides the minimum and maximum non-turbo frequency ratios. The bus clock frequency (typically 100 MHz) is used to convert ratios to kHz.

Enums

CpuGovernor

CPU frequency scaling governor.

Functions

cpufreq_available_governors

Get the list of available governor names.

cpufreq_get_available_frequencies

Get available CPU frequencies in kHz.

cpufreq_get_frequency

Get the current CPU frequency in kHz.

cpufreq_get_governor

Get the current governor.

cpufreq_get_max_frequency

Get the maximum frequency in kHz.

cpufreq_get_min_frequency

Get the minimum frequency in kHz.

cpufreq_init

Initialize the CPU frequency scaling subsystem.

cpufreq_ondemand_sample

Sample CPU load and adjust frequency (called periodically).

cpufreq_set_frequency

Set the target CPU frequency in kHz.

cpufreq_set_governor

Set the active CPU frequency governor.

is_initialized

Check if cpufreq is initialized.