CPUFreq_Kernel Class Reference

Class to control one CPU's frequency by a kernel governor. More...

#include <cpufreq_interface.h>

Inheritance diagram for CPUFreq_Kernel:

List of all members.

Public Member Functions
	CPUFreq_Kernel (std::list< int > cpu_list, unsigned long sampling_rate=333000)
	constructor
	~CPUFreq_Kernel ()
	destructor
bool	init ()
	init cpufreq interface and set kernel governor
Private Member Functions
bool	readFrequencies ()
	reads out frequencies
int	adjustSpeed ()
	adjusts speeds
void	reinitSpeed ()
	reinits speeds
void	setConfig ()
	set configuration in initialize values
int	writeOndemand (const string &name, int value)
	write a value to an ondemand file
Private Attributes
unsigned long	_sampling_rate
	the sampling rate to use
int	_down_threshold
	down threshold
int	_sampling_down_factor
	_sampling down factor
string	ON_DEMAND_STRING
	name of ondemand governor to write to governor file
string	POWERSAVE_STRING
	name of powersave governor to write to governor file
string	PERFORMANCE_STRING
	name of performance governor to write to governor file

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Detailed Description

Class to control one CPU's frequency by a kernel governor.

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Constructor & Destructor Documentation

CPUFreq_Kernel::CPUFreq_Kernel (  std::list< int >  cpu_list, unsigned long  sampling_rate = 333000 )

constructor Parameters: cpu_list  stl list containing all cores the object has to care about sampling_rate  the sampling rate to use

CPUFreq_Kernel::~CPUFreq_Kernel (   )

destructor

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Member Function Documentation

int CPUFreq_Kernel::adjustSpeed (   )  [private, virtual]

adjusts speeds Returns: -1 if speed has been decreased 1 if speed has been increased 0 if speed has not been modified Implements CPUFreq_Interface.

bool CPUFreq_Kernel::init (   )  [virtual]

init cpufreq interface and set kernel governor Returns: true on success, false otherwise Implements CPUFreq_Interface.

bool CPUFreq_Kernel::readFrequencies (   )  [private, virtual]

reads out frequencies Returns: false on error Implements CPUFreq_Interface.

void CPUFreq_Kernel::reinitSpeed (   )  [private, virtual]

reinits speeds function for suspend workaround. after resuming the frequency might have changed and we haven't recognized. This could possibly break old PowerNow! machines, but as far as I know jumping more than one frequency at once is fixed in kernel module for that machines Implements CPUFreq_Interface.

void CPUFreq_Kernel::setConfig (   )  [private, virtual]

set configuration in initialize values Implements CPUFreq_Interface.

int CPUFreq_Kernel::writeOndemand (  const string &  name, int  value )  [private]

write a value to an ondemand file write value to a file in /sys/.../cpufreq/ondemand/ Parameters: name  the name of the file to write to value  the value to write Returns: 0 on success Return values: -1  if file does not exist 1  if writing failed 0  on success

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Member Data Documentation

int CPUFreq_Kernel::_down_threshold [private]

down threshold

int CPUFreq_Kernel::_sampling_down_factor [private]

_sampling down factor

unsigned long CPUFreq_Kernel::_sampling_rate [private]

the sampling rate to use

string CPUFreq_Kernel::ON_DEMAND_STRING [private]

name of ondemand governor to write to governor file

string CPUFreq_Kernel::PERFORMANCE_STRING [private]

name of performance governor to write to governor file

string CPUFreq_Kernel::POWERSAVE_STRING [private]

name of powersave governor to write to governor file

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The documentation for this class was generated from the following files:

• /home/hmacht/devel/powersave/daemon/cpufreq_interface.h
• /home/hmacht/devel/powersave/daemon/cpufreq_kernel.cpp

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