PerfProfiler: Support context switch events

Change-Id: I328b518cc3674ee26975edf26d40057ceb2c21a2
Reviewed-by: Milian Wolff <milian.wolff@kdab.com>

src/plugins/perfprofiler/perfevent.h

@@ -50,7 +50,8 @@ public:
         ThreadStartTypeId      = -2,
         ThreadEndTypeId        = -3,
         LostTypeId             = -4,
-        LastSpecialTypeId      = -5
+        ContextSwitchTypeId    = -5,
+        LastSpecialTypeId      = -256
     };
 
     const QVector<qint32> &origFrames() const { return m_origFrames; }
@@ -72,6 +73,9 @@ public:
 
     quint8 feature() const { return m_feature; }
 
+    quint8 extra() const { return m_extra; }
+    void setExtra(quint8 extra) { m_extra = extra; }
+
 private:
     friend QDataStream &operator>>(QDataStream &stream, PerfEvent &event);
     friend QDataStream &operator<<(QDataStream &stream, const PerfEvent &event);
@@ -86,6 +90,7 @@ private:
     quint8 m_origNumGuessedFrames = 0;
     quint8 m_numGuessedFrames = 0;
     quint8 m_feature = PerfEventType::InvalidFeature;
+    quint8 m_extra = 0;
 };
 
 inline QDataStream &operator>>(QDataStream &stream, PerfEvent &event)
@@ -109,6 +114,7 @@ inline QDataStream &operator>>(QDataStream &stream, PerfEvent &event)
     case PerfEventType::Sample43:
     case PerfEventType::Sample:
     case PerfEventType::TracePointSample:
+    case PerfEventType::ContextSwitchDefinition:
         break;
     case PerfEventType::InvalidFeature:
         QTC_ASSERT(false, return stream);
@@ -130,6 +136,12 @@ inline QDataStream &operator>>(QDataStream &stream, PerfEvent &event)
     case PerfEventType::LostDefinition:
         event.setTypeIndex(PerfEvent::LostTypeId);
         break;
+    case PerfEventType::ContextSwitchDefinition:
+        event.setTypeIndex(PerfEvent::ContextSwitchTypeId);
+        bool isSwitchOut;
+        stream >> isSwitchOut;
+        event.setExtra(isSwitchOut);
+        break;
     default: {
         qint32 typeIndex;
         stream >> event.m_origFrames >> event.m_origNumGuessedFrames >> typeIndex;
@@ -155,6 +167,9 @@ inline QDataStream &operator<<(QDataStream &stream, const PerfEvent &event)
     case PerfEventType::ThreadEnd:
     case PerfEventType::LostDefinition:
         break;
+    case PerfEventType::ContextSwitchDefinition:
+        stream << bool(event.extra());
+        break;
     case PerfEventType::Sample43:
     case PerfEventType::Sample:
     case PerfEventType::TracePointSample:

src/plugins/perfprofiler/perfeventtype.h

@@ -55,6 +55,7 @@ public:
         TracePointFormat,
         TracePointSample,
         AttributesDefinition,
+        ContextSwitchDefinition,
         InvalidFeature
     };
 
@@ -66,7 +67,8 @@ public:
 
     static quint64 metaFeatures()
     {
-        return (1ull << ThreadStart) | (1ull << ThreadEnd) | (1ull << LostDefinition);
+        return (1ull << ThreadStart) | (1ull << ThreadEnd) | (1ull << LostDefinition)
+               | (1ull << ContextSwitchDefinition);
     }
 
     static quint64 locationFeatures()
@@ -143,6 +145,7 @@ public:
         case ThreadStart:
         case ThreadEnd:
         case LostDefinition:
+        case ContextSwitchDefinition:
             return true;
         default:
             return false;

src/plugins/perfprofiler/perfprofilertracefile.cpp

@@ -237,6 +237,7 @@ void PerfProfilerTraceFile::readMessages(const QByteArray &buffer)
         case PerfEventType::ThreadStart:
         case PerfEventType::ThreadEnd:
         case PerfEventType::LostDefinition:
+        case PerfEventType::ContextSwitchDefinition:
             if (acceptsSamples())
                 traceManager->appendEvent(std::move(event));
             break;

src/plugins/perfprofiler/perfprofilertracemanager.cpp

@@ -217,6 +217,8 @@ void PerfProfilerTraceManager::resetAttributes()
                                                            tr("Thread ended")));
     setEventType(PerfEvent::LostTypeId, PerfEventType(PerfEventType::LostDefinition,
                                                       tr("Samples lost")));
+    setEventType(PerfEvent::ContextSwitchTypeId,
+                 PerfEventType(PerfEventType::ContextSwitchDefinition, tr("Context switch")));
 }
 
 void PerfProfilerTraceManager::finalize()

src/plugins/perfprofiler/perftimelinemodel.cpp

@@ -198,6 +198,10 @@ QVariantMap PerfTimelineModel::details(int index) const
         result.insert(tr("Details"), tr("lost sample"));
         result.insert(tr("Timestamp"), Timeline::formatTime(startTime(index),
                                                             manager->traceDuration()));
+    } else if (typeId == PerfEvent::ContextSwitchTypeId) {
+        result.insert(tr("Details"), tr("context switch"));
+        result.insert(tr("Timestamp"), Timeline::formatTime(startTime(index),
+                                                            manager->traceDuration()));
     } else {
         const PerfProfilerTraceManager::Symbol &symbol
                 = manager->symbol(manager->aggregateAddresses()
@@ -438,6 +442,11 @@ void PerfTimelineModel::loadEvent(const PerfEvent &event, int numConcurrentThrea
         addSample(guessed, 0, 0);
         break;
     }
+    case PerfEvent::ContextSwitchTypeId: {
+        const int id = TimelineModel::insert(event.timestamp(), 1, PerfEvent::ContextSwitchTypeId);
+        m_data.insert(id, StackFrame::sampleFrame());
+        break;
+    }
     case PerfEvent::ThreadStartTypeId: {
         if (m_threadStartTimestamp < 0 || event.timestamp() <= m_threadStartTimestamp)
             m_threadStartTimestamp = event.timestamp() - 1;