121 lines
3 KiB
C++
121 lines
3 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2021 David Edmundson <davidedmundson@kde.org>
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SPDX-FileCopyrightText: 2020 Roman Gilg <subdiff@gmail.com>
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SPDX-License-Identifier: LGPL-2.0-or-later
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*/
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#include "ftrace.h"
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#include <QDBusConnection>
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#include <QDebug>
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#include <QDir>
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#include <QFile>
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#include <QFileInfo>
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#include <QScopeGuard>
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#include <QTextStream>
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namespace KWin
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{
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KWIN_SINGLETON_FACTORY(KWin::FTraceLogger)
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FTraceLogger::FTraceLogger(QObject *parent)
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: QObject(parent)
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{
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if (qEnvironmentVariableIsSet("KWIN_PERF_FTRACE")) {
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setEnabled(true);
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} else {
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QDBusConnection::sessionBus().registerObject(QStringLiteral("/FTrace"), this, QDBusConnection::ExportScriptableContents);
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}
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}
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bool FTraceLogger::isEnabled() const
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{
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return m_file.isOpen();
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}
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void FTraceLogger::setEnabled(bool enabled)
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{
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QMutexLocker lock(&m_mutex);
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if (enabled == isEnabled()) {
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return;
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}
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if (enabled) {
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open();
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} else {
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m_file.close();
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}
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emit enabledChanged();
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}
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bool FTraceLogger::open()
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{
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const QString path = filePath();
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if (path.isEmpty()) {
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return false;
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}
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m_file.setFileName(path);
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if (!m_file.open(QIODevice::WriteOnly)) {
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qWarning() << "No access to trace marker file at:" << path;
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}
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return true;
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}
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QString FTraceLogger::filePath()
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{
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if (qEnvironmentVariableIsSet("KWIN_PERF_FTRACE_FILE")) {
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return qgetenv("KWIN_PERF_FTRACE_FILE");
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}
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QFile mountsFile("/proc/mounts");
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if (!mountsFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
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qWarning() << "No access to mounts file. Can not determine trace marker file location.";
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return QString();
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}
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auto lineInfo = [](const QString &line) {
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const int start = line.indexOf(' ') + 1;
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const int end = line.indexOf(' ', start);
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const QString dirPath(line.mid(start, end - start));
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if (dirPath.isEmpty() || !QFileInfo(dirPath).exists()) {
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return QFileInfo();
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}
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return QFileInfo(QDir(dirPath), QStringLiteral("trace_marker"));
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};
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QFileInfo markerFileInfo;
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QTextStream mountsIn(&mountsFile);
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QString mountsLine = mountsIn.readLine();
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while (!mountsLine.isNull()) {
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if (mountsLine.startsWith("tracefs")) {
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const auto info = lineInfo(mountsLine);
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if (info.exists()) {
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markerFileInfo = info;
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break;
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}
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}
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if (mountsLine.startsWith("debugfs")) {
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markerFileInfo = lineInfo(mountsLine);
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}
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mountsLine = mountsIn.readLine();
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}
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mountsFile.close();
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if (!markerFileInfo.exists()) {
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qWarning() << "Could not determine trace marker file location from mounts.";
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return QString();
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}
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return markerFileInfo.absoluteFilePath();
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}
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FTraceDuration::~FTraceDuration()
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{
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FTraceLogger::self()->trace(m_message, " end_ctx=", m_context);
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}
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}
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