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/*
* Copyright 2023 KylinSoft Co., Ltd.
*
* 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 3 of the License, or (at your 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, see <https://www.gnu.org/licenses/>.
*/
#include "pressurewatcher.h"
#include <QMetaEnum>
#include <QDebug>
#include <sys/epoll.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "common.h"
PressureWatcher::PressureWatcher(QObject *parent)
: ResourceWatcher{parent}
, m_stop(false)
{
initTriggers();
}
void PressureWatcher::start()
{
if (m_triggers.isEmpty()) {
qWarning() << "PressureWatcher: pressure triggers is empty.";
return;
}
struct epoll_event events[1024];
int epfd = epoll_create(1);
if (epfd < 0) {
qWarning() << "epoll_create failed, " << strerror(errno);
return;
}
qDebug() << "m_triggers" << m_triggers.first().resource;
for (auto &trigger : m_triggers) {
int fd = open(trigger.fileInterface.toLocal8Bit().data(), O_RDWR | O_NONBLOCK);
if (fd < 0) {
qWarning() << "open file " << trigger.fileInterface << " failed, " << strerror(errno);
continue;
}
QByteArray ba = trigger.trigger.toLocal8Bit();
const char *trigger2write = ba.data();
if (write(fd, trigger2write, strlen(trigger2write) + 1) < 0) {
qWarning() << "write failed, " << strerror(errno);
continue;
}
epoll_event ev;
ev.data.fd = fd;
ev.events = EPOLLPRI;
ev.events |= EPOLLET;
int result = epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev);
if (result < 0) {
qWarning() << "epoll_ctl failed, " << strerror(errno);
continue;
}
trigger.fd = fd;
}
while (!m_stop) {
qDebug() << "epoll wait ";
int n = epoll_wait(epfd, events, 1024, -1);
qDebug() << "epoll wait " << n;
QMap<ConfManager::Resource, ConfManager::ResourceUrgency> triggersUrgency;
for (int i=0; i<n; ++i) {
if (events[i].events & EPOLLPRI) {
qDebug() << "fd " << events[i].data.fd;
PressureTrigger trig = trigger(events[i].data.fd);
if (triggersUrgency.contains(trig.resource)) {
if (triggersUrgency.value(trig.resource) < trig.urgency) {
triggersUrgency[trig.resource] = trig.urgency;
}
continue;
}
triggersUrgency[trig.resource] = trig.urgency;
}
}
handleWarningMessage(triggersUrgency);
sleep(1);
}
for (auto const &trigger : qAsConst(m_triggers)) {
close(trigger.fd);
}
}
void PressureWatcher::stop()
{
m_stop = true;
}
void PressureWatcher::initTriggers()
{
ConfManager &confMgr = common::Singleton<ConfManager>::GetInstance();
auto initTrigger = [this, &confMgr](ConfManager::Resource resouce) {
auto trigger = confMgr.pressureTriggers(resouce);
auto triIt = trigger.constBegin();
QMetaEnum meta = QMetaEnum::fromType<ConfManager::Resource>();
QString strResouce(meta.valueToKey(resouce));
QString fileInterface = QString("/proc/pressure/%1").arg(strResouce.toLower());
while (triIt != trigger.constEnd()) {
m_triggers.push_back({ resouce, triIt.key(), triIt.value(), fileInterface, -1 });
++ triIt;
}
};
auto pressureResources = confMgr.pressureResouces();
for (const auto &resource : pressureResources) {
initTrigger(resource);
}
}
PressureWatcher::PressureTrigger PressureWatcher::trigger(int fd)
{
for (const auto &trigger : qAsConst(m_triggers)) {
if (trigger.fd == fd) {
return trigger;
}
}
return PressureWatcher::PressureTrigger {};
}
void PressureWatcher::handleWarningMessage(QMap<ConfManager::Resource, ConfManager::ResourceUrgency> triggerUrgency)
{
ConfManager &confMgr = common::Singleton<ConfManager>::GetInstance();
QMetaEnum meta = QMetaEnum::fromType<ConfManager::ResourceUrgency>();
auto it = triggerUrgency.constBegin();
while (it != triggerUrgency.constEnd()) {
int level = confMgr.resourceUrgencyIndex(it.value());
if (level == -1) {
qWarning() << "Get urgency index error, urgency is" << it.value();
++ it;
continue;
}
++ level;
qDebug() << "level " << level << it.key();
switch (it.key())
{
case ConfManager::CPU:
Q_EMIT ResourceThresholdWarning("CPU", level);
break;
case ConfManager::IO:
Q_EMIT ResourceThresholdWarning("IO", level);
break;
case ConfManager::Memory:
Q_EMIT ResourceThresholdWarning("Memory", level);
break;
}
++ it;
}
}
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