107 lines
3 KiB
C
107 lines
3 KiB
C
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/*
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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-License-Identifier: LGPL-2.0-or-later
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*/
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#pragma once
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#include <QFile>
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#include <QMutex>
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#include <QMutexLocker>
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#include <QObject>
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#include <QTextStream>
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#include <kwinglobals.h>
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namespace KWin
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{
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/**
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* FTraceLogger is a singleton utility for writing log messages using ftrace
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*
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* Usage: Either:
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* Set the KWIN_PERF_FTRACE environment variable before starting the application
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* Calling on DBus /FTrace org.kde.kwin.FTrace.setEnabled true
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* After having created the ftrace mount
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*/
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class KWIN_EXPORT FTraceLogger : public QObject
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{
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Q_OBJECT
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Q_CLASSINFO("D-Bus Interface", "org.kde.kwin.FTrace");
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Q_PROPERTY(bool isEnabled READ isEnabled NOTIFY enabledChanged)
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public:
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~FTraceLogger() = default;
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/**
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* Enabled through DBus and logging has started
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*/
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bool isEnabled();
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/**
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* Main log function
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* Takes any number of arguments that can be written into QTextStream
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*/
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template<typename... Args> void trace(Args... args)
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{
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Q_ASSERT(isEnabled());
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QMutexLocker lock(&m_mutex);
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if (!m_file.isOpen()) {
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return;
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}
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QTextStream stream(&m_file);
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(stream << ... << args) << Qt::endl;
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}
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Q_SIGNALS:
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void enabledChanged();
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public Q_SLOTS:
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Q_SCRIPTABLE void setEnabled(bool enabled);
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private:
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static QString filePath();
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bool open();
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QFile m_file;
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QMutex m_mutex;
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KWIN_SINGLETON(FTraceLogger)
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};
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class KWIN_EXPORT FTraceDuration
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{
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public:
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template<typename... Args> FTraceDuration(Args... args)
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{
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static QAtomicInteger<qulonglong> s_context = 0;
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QTextStream stream(&m_message);
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(stream << ... << args);
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stream.flush();
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m_context = ++s_context;
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FTraceLogger::self()->trace(m_message, " begin_ctx=", m_context);
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}
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~FTraceDuration();
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private:
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QByteArray m_message;
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qulonglong m_context;
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};
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} // namespace KWin
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/**
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* Optimised macro, arguments are only copied if tracing is enabled
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*/
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#define fTrace(...) \
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if (KWin::FTraceLogger::self()->isEnabled()) \
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KWin::FTraceLogger::self()->trace(__VA_ARGS__);
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/**
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* Will insert two markers into the log. Once when called, and the second at the end of the relevant block
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* In GPUVis this will appear as a timed block with begin_ctx and end_ctx markers
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*/
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#define fTraceDuration(...) \
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QScopedPointer<KWin::FTraceDuration> _duration(KWin::FTraceLogger::self()->isEnabled() ? new KWin::FTraceDuration(__VA_ARGS__) : nullptr);
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