File indexing completed on 2024-05-12 17:00:15

 
 /*
     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);
 }