more unfinished changes, process tab for dashboard

Plugins/ZShell/Services/memory.cpp

@@ -3,6 +3,8 @@
 #include <qfile.h>
 #include <qregularexpression.h>
 
+#include <unistd.h>
+
 namespace ZShell::services {
 
 Memory::Memory(QObject* parent) : TickingService(parent) {}
@@ -15,6 +17,18 @@ qreal Memory::total() const {
 	return m_total;
 }
 
+qreal Memory::cached() const {
+	return m_cached;
+}
+
+qreal Memory::readTotal() const {
+	return m_readTotal;
+}
+
+qreal Memory::writeTotal() const {
+	return m_writeTotal;
+}
+
 qreal Memory::percentage() const {
 	return m_total > 0.0 ? m_used / m_total : 0.0;
 }
@@ -31,6 +45,8 @@ void Memory::tick() {
 		QStringLiteral("MemTotal: *(\\d+)"));
 	static const QRegularExpression reAvail(
 		QStringLiteral("MemAvailable: *(\\d+)"));
+	static const QRegularExpression reCached(QStringLiteral(
+		"Cached: *(\\d+)"));
 	const QString text = QString::fromLatin1(data);
 
 	const auto totalMatch = reTotal.match(text);
@@ -45,14 +61,50 @@ void Memory::tick() {
 		return;
 	}
 	const quint64 usedKib = totalKib > availKib ? totalKib - availKib : 0;
+	const auto cachedMatch = reCached.match(text);
+	const quint64 cachedKib =
+		cachedMatch.hasMatch() ? cachedMatch.captured(1).toULongLong() : 0;
 
-	if (totalKib == m_lastTotal && usedKib == m_lastUsed) {
+	static const QRegularExpression rePgin(QStringLiteral("pgpgin (\\d+)"));
+	static const QRegularExpression rePgout(QStringLiteral("pgpgout (\\d+)"));
+	quint64 readKib = 0;
+	quint64 writeKib = 0;
+	{
+		QFile vf(QStringLiteral("/proc/vmstat"));
+		if (vf.open(QIODevice::ReadOnly | QIODevice::Text)) {
+			const QString vtext = QString::fromLatin1(vf.readAll());
+			vf.close();
+			const double pageKib = getpagesize() / 1024.0;
+			const auto pgin = rePgin.match(vtext);
+			const auto pgout = rePgout.match(vtext);
+			if (pgin.hasMatch()) {
+				readKib = static_cast<quint64>(static_cast<double>(
+							pgin.captured(1).toULongLong()) *
+						pageKib);
+			}
+			if (pgout.hasMatch()) {
+				writeKib = static_cast<quint64>(static_cast<double>(
+							pgout.captured(1).toULongLong()) *
+						pageKib);
+			}
+		}
+	}
+
+	if (totalKib == m_lastTotal && usedKib == m_lastUsed &&
+		cachedKib == m_lastCached && readKib == m_lastReadKib &&
+		writeKib == m_lastWriteKib) {
 		return;
 	}
 	m_lastTotal = totalKib;
 	m_lastUsed = usedKib;
+	m_lastCached = cachedKib;
+	m_lastReadKib = readKib;
+	m_lastWriteKib = writeKib;
 	m_total = static_cast<qreal>(totalKib);
 	m_used = static_cast<qreal>(usedKib);
+	m_cached = static_cast<qreal>(cachedKib);
+	m_readTotal = static_cast<qreal>(readKib);
+	m_writeTotal = static_cast<qreal>(writeKib);
 	Q_EMIT changed();
 }