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/*
SPDX-FileCopyrightText: 2020 David Redondo <kde@david-redondo.de>
SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#include "linuxbackend.h"
#include <systemstats/SensorObject.h>
#include <systemstats/SensorProperty.h>
#include <QFile>
LinuxMemoryBackend::LinuxMemoryBackend(KSysGuard::SensorContainer *container)
: MemoryBackend(container)
{
}
void LinuxMemoryBackend::update()
{
if (!m_physicalObject->isSubscribed() && !m_swapObject->isSubscribed()) {
return;
}
QFile meminfo(QStringLiteral("/proc/meminfo"));
meminfo.open(QIODevice::ReadOnly);
// The format of the file is as follows:
// Fieldname:[whitespace]value kB
// A description of the fields can be found at
// https://www.kernel.org/doc/html/latest/filesystems/proc.html#meminfo
unsigned long long total, free, available, buffer, cache, slab, swapTotal, swapFree;
for (QByteArray line = meminfo.readLine(); !line.isEmpty(); line = meminfo.readLine()) {
int colonIndex = line.indexOf(':');
const auto fields = line.simplified().split(' ');
const QByteArray name = line.left(colonIndex);
const unsigned long long value = std::strtoull(line.mid(colonIndex + 1), nullptr, 10) * 1024;
if (name == "MemTotal") {
total = value;
} else if (name == "MemFree") {
free = value;
} else if (name == "MemAvailable") {
available = value;
} else if (name == "Buffers") {
buffer = value;
} else if (name == "Cached") {
cache = value;
} else if (name == "Slab") {
slab = value;
} else if (name == "SwapTotal") {
swapTotal = value;
} else if (name == "SwapFree") {
swapFree = value;
}
}
m_total->setValue(total);
m_used->setValue(total - available);
m_free->setValue(available);
m_application->setValue(total - free - cache - buffer - slab);
m_cache->setValue(cache + slab);
m_buffer->setValue(buffer);
m_swapTotal->setValue(swapTotal);
m_swapUsed->setValue(swapTotal - swapFree);
m_swapFree->setValue(swapFree);
}
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