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/***************************************************************************
* *
* Powersave Daemon *
* *
* Copyright (C) 2004,2005 SUSE Linux Products GmbH *
* *
* Author(s): Holger Macht <hmacht@suse.de> *
* *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 2 of the License, or (at you *
* option) any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA *
* *
***************************************************************************/
#include "throttle_interface.h"
#include "config_pm.h"
#include "event_management.h"
#include "globals.h"
using namespace Powersave::Globals;
ThrottleInterface::ThrottleInterface()
{
_msecs_cpu_idle = 0;
_cpu_is_idle = false;
_event_state = NO_PROCESSOR_EVENT_THROWN;
_throttling_supported = true;
}
bool ThrottleInterface::updateCPUState(EventManagement *eM)
{
int cpu_load, ret;
/* build the array of cpu load values
ideally, this should be done elsewhere... */
ret = calcCPULoad(config_obj->current_scheme->CONSIDER_NICE);
if (ret) { // something went wrong
pDebug(DBG_WARN, "calcCPULoad failed: %d", ret);
return false;
}
// use all cpus. For determining if we want to throttle, this is sufficient
cpu_load = getCPULoad(-1);
/*******************************************/
/* this checks whether CPU should get throttled ... ****** */
/* CPUs get throttled if load of CPU stays below CPU_IDLE_LIMIT
longer than CPU_IDLE_TIMEOUT */
if (config_obj->current_scheme && config_obj->current_scheme->ALLOW_THROTTLING
&& config_obj->current_scheme->CPU_IDLE_TIMEOUT > 0) {
if (cpu_load < config_obj->current_scheme->CPU_IDLE_LIMIT) {
_cpu_is_idle = true;
_msecs_cpu_idle += config_obj->current_scheme->POLL_INTERVAL;
}
else {
_cpu_is_idle = false;
if (_event_state == PROCESSOR_BUSY_THROWN)
_msecs_cpu_idle = 0;
}
if (!_cpu_is_idle &&
(_event_state == NO_PROCESSOR_EVENT_THROWN || _event_state == PROCESSOR_IDLE_THROWN)) {
// dethrottle CPU immediately if CPU is above CPU_BELOW_DYNAMIC usage limit
// and a low or no processor event has been thrown
// be careful! Do not throw a processor.busy event immediately after a processor.idle
// event. The idle event may cause such high load (dbus signals, hal, clients)
// that a processor.busy event maybe thrown --> this would result in a idle time
// of only config_obj->current_scheme->POLL_INTERVAL
if (_msecs_cpu_idle != 0) {
eM->executeEvent("processor.busy");
_event_state = PROCESSOR_BUSY_THROWN;
}
} else if (_cpu_is_idle &&
(_event_state == NO_PROCESSOR_EVENT_THROWN || _event_state == PROCESSOR_BUSY_THROWN)) {
// count up idle time and send a throttle CPU when time limit
// (config_obj->current_scheme->CPU_IDLE_TIMEOUT variable) is reached
pDebug(DBG_DEBUG, "cpu_idle_time: %lu; timeout: %lu; low event already thrown : %d"
", poll_Intervall: %lu; _cpu_is_idle: %d",
_msecs_cpu_idle, config_obj->current_scheme->CPU_IDLE_TIMEOUT * 1000, _event_state,
config_obj->current_scheme->POLL_INTERVAL, _cpu_is_idle);
if (_msecs_cpu_idle > config_obj->current_scheme->CPU_IDLE_TIMEOUT * 1000) {
eM->executeEvent("processor.idle");
_msecs_cpu_idle = 0;
_event_state = PROCESSOR_IDLE_THROWN;
}
}
}
/*******************************************************/
return true;
}
void ThrottleInterface::restart()
{
_msecs_cpu_idle = 0;
_cpu_is_idle = false;
_event_state = NO_PROCESSOR_EVENT_THROWN;
}
bool ThrottleInterface::throttle(int percent)
{
if (!_throttling_supported || !config_obj->current_scheme->ALLOW_THROTTLING) {
return false;
}
if (percent == -1)
percent = config_obj->current_scheme->MAX_CPU_THROTTLING;
if (setThrottlingPercent(percent) <= 0)
_throttling_supported = false;
else {
pDebug(DBG_INFO, "CPU(s) throttled to %d percent", percent);
}
return _throttling_supported;
}
bool ThrottleInterface::dethrottle()
{
if (_throttling_supported) {
if (setThrottlingPercent(0) <= 0)
_throttling_supported = false;
else {
pDebug(DBG_INFO, "CPU(s) dethrottled");
}
}
return _throttling_supported;
}
void ThrottleInterface::disableThrottling() {
_throttling_supported = false;
}
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