CPUFreq_Interface Class Reference

#include <cpufreq_interface.h>

Inheritance diagram for CPUFreq_Interface:

List of all members.

Public Member Functions
	CPUFreq_Interface (std::list< int > cpu_list)
	constructor
virtual	~CPUFreq_Interface ()
	destructor
virtual bool	init ()=0
	checks if current cpu_id has a cpufreq directory and that it is no symlink
virtual int	adjustSpeed ()=0
	adjusts speeds
virtual void	reinitSpeed ()=0
	reinits speeds
virtual void	setConfig ()=0
	set configuration in initialize values
void	setConfigs (int high_cpu, int max_limit, int hysters, int consider_nice)
	Update configs and apply them.
int	setGovernor (const std::string &new_governor)
	set a ne cpufreq governor
int	setMode (CPUFREQ_MODE mode)
	set the current cpufreq policy
virtual bool	readFrequencies ()=0
	reads out frequencies
CPUFREQ_MODE	getMode ()
	get current cpufreq policy
Static Public Member Functions
static bool	read_line (const char *filename, char *line, unsigned len)
	read a line from a file
static bool	write_line (const char *filename, const char *fmt,...)
	write a line to a file
Static Protected Member Functions
static unsigned	read_value (const char *filename)
	read an integer value from a file
Protected Attributes
string	GOVERNOR_FILE
	file where active governor is in
string	MIN_SPEED_FILE
	file containing the minimum freq
string	MAX_SPEED_FILE
	file containing the maximum freq
string	AVAILABLE_FREQS_FILE
	file containing available frequencies
int	_cpu_max
	value specifying when to switch up
int	_cpu_hysteresis
	value avoiding constant up/down switching
int	_high_cpu_limit
	if the load difference is higher than this go directly for full speed
int	_consider_nice
	if niced processes should also count
CPUFREQ_MODE	_mode
	stores the current cpufreq policy
std::list< int >	_cpu_cores
	list holding all cores which are affected by this interface

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Constructor & Destructor Documentation

CPUFreq_Interface::CPUFreq_Interface (  std::list< int >  cpu_list  )

constructor Parameters: cpu_list  stl list containing all cores the object has to care about

CPUFreq_Interface::~CPUFreq_Interface (   )  [virtual]

destructor

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Member Function Documentation

virtual int CPUFreq_Interface::adjustSpeed (   )  [pure virtual]

adjusts speeds Returns: -1 if speed has been decreased 1 if speed has been increased 0 if speed has not been modified Implemented in CPUFreq_Userspace, and CPUFreq_Kernel.

CPUFREQ_MODE CPUFreq_Interface::getMode (   )

get current cpufreq policy Returns: CPUFREQ_MODE

virtual bool CPUFreq_Interface::init (   )  [pure virtual]

checks if current cpu_id has a cpufreq directory and that it is no symlink Returns: true on success, false on error Implemented in CPUFreq_Userspace, and CPUFreq_Kernel.

bool CPUFreq_Interface::read_line (  const char *  filename, char *  line, unsigned  len )  [static]

read a line from a file Parameters: filename  the filename to read from line  char pointer to store the read line len  chars to read Returns: false on error

unsigned CPUFreq_Interface::read_value (  const char *  filename  )  [static, protected]

read an integer value from a file Parameters: filename  filename to read from Returns: the value read or 0 on error

virtual bool CPUFreq_Interface::readFrequencies (   )  [pure virtual]

reads out frequencies Returns: false on error Implemented in CPUFreq_Userspace, and CPUFreq_Kernel.

virtual void CPUFreq_Interface::reinitSpeed (   )  [pure 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 Implemented in CPUFreq_Userspace, and CPUFreq_Kernel.

virtual void CPUFreq_Interface::setConfig (   )  [pure virtual]

set configuration in initialize values Implemented in CPUFreq_Userspace, and CPUFreq_Kernel.

void CPUFreq_Interface::setConfigs (  int  high_cpu, int  max_limit, int  hysters, int  consider_nice )

Update configs and apply them. Parameters: high_cpu  increase frequency if CPU load exceeds this value max_limit  directly jump to the highest available frequency if the difference between CPU Load and last measured CPU load exceeds this value (only valid for userspace governor hysters  hysteresis value to not oscillate between two frequencies if CPU Load does not change createHysteresisArray() consider_nice  consider niced processes values as CPU load or not

int CPUFreq_Interface::setGovernor (  const std::string &  new_governor  )

set a ne cpufreq governor

int CPUFreq_Interface::setMode (  CPUFREQ_MODE  mode  )

set the current cpufreq policy _PERFORMANCE, _DYNAMIC, _POWERSAVE Parameters: mode  CPUFREQ_MODE Returns: 0 on success -1 on failure Always test the return value as the kernel class might loose the powersave or performance governor If the call fails the cpufreq classes are destroyed, isSupported will return false and you must not call any CPUFreq functions any more (in fact these calls should be just ignored, but better be careful)

bool CPUFreq_Interface::write_line (  const char *  filename, const char *  fmt,   ... )  [static]

write a line to a file Parameters: filename  the filename to read from fmt  format to write ...  variable argument list to write Returns: false on error

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Member Data Documentation

int CPUFreq_Interface::_consider_nice [protected]

if niced processes should also count not all of those work with "kernel" methods.

std::list< int > CPUFreq_Interface::_cpu_cores [protected]

list holding all cores which are affected by this interface

int CPUFreq_Interface::_cpu_hysteresis [protected]

value avoiding constant up/down switching

int CPUFreq_Interface::_cpu_max [protected]

value specifying when to switch up

int CPUFreq_Interface::_high_cpu_limit [protected]

if the load difference is higher than this go directly for full speed

CPUFREQ_MODE CPUFreq_Interface::_mode [protected]

stores the current cpufreq policy (powersave, performance, dynamic)

string CPUFreq_Interface::AVAILABLE_FREQS_FILE [protected]

file containing available frequencies

string CPUFreq_Interface::GOVERNOR_FILE [protected]

file where active governor is in

string CPUFreq_Interface::MAX_SPEED_FILE [protected]

file containing the maximum freq

string CPUFreq_Interface::MIN_SPEED_FILE [protected]

file containing the minimum freq

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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_interface.cpp

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