Be more verbose about aggregated memory allocations

The memory profiler aggregates allocations originating from the same
QML/JS constructs into one event. This change makes sure the origins
are really the same calls, not only the same functions and gives some
more details on hom much memory was allocated or deallocated in how
many steps.

Change-Id: I784c521855122f7b3b894417de0afb216766e2d4
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

plugins/qmlprofilerextension/memoryusagemodel.cpp

@@ -145,7 +145,7 @@ const QVariantList MemoryUsageModel::getEventDetails(int index) const
     const MemoryUsageModelPrivate::Range *ev = &d->range(index);
 
     QVariantMap res;
-    if (ev->delta > 0)
+    if (ev->allocated >= -ev->deallocated)
         res.insert(title, tr("Memory Allocated"));
     else
         res.insert(title, tr("Memory Freed"));
@@ -156,7 +156,14 @@ const QVariantList MemoryUsageModel::getEventDetails(int index) const
     result << res;
     res.clear();
 
-    res.insert(tr("Allocation"), QVariant(QString::fromLatin1("%1 bytes").arg(ev->delta)));
+    if (ev->allocations > 0) {
+        res.insert(tr("Allocated"), QString::fromLatin1("%1 bytes").arg(ev->allocated));
+        res.insert(tr("Allocations"), QString::number(ev->allocations));
+    }
+    if (ev->deallocations > 0) {
+        res.insert(tr("Deallocated"), QString::fromLatin1("%1 bytes").arg(-ev->deallocated));
+        res.insert(tr("Deallocations"), QString::number(ev->deallocations));
+    }
     res.insert(tr("Type"), QVariant(MemoryUsageModelPrivate::memoryTypeName(ev->type)));
     if (ev->originTypeIndex != -1) {
         res.insert(tr("Location"),
@@ -189,9 +196,7 @@ void MemoryUsageModel::loadData()
     int currentJSHeapIndex = -1;
 
     QStack<RangeStackFrame> rangeStack;
-    MemoryAllocation dummy = {
-        QmlDebug::MaximumMemoryType, -1, -1 , -1
-    };
+    MemoryAllocation dummy;
 
     const QVector<QmlProfilerDataModel::QmlEventTypeData> &types = simpleModel->getEventTypes();
     foreach (const QmlProfilerDataModel::QmlEventData &event, simpleModel->getEvents()) {
@@ -207,18 +212,18 @@ void MemoryUsageModel::loadData()
         }
 
         if (type.detailType == QmlDebug::SmallItem || type.detailType == QmlDebug::LargeItem) {
-            currentUsage += event.numericData1;
             MemoryAllocation &last = currentUsageIndex > -1 ? d->data(currentUsageIndex) : dummy;
-            if (!rangeStack.empty() && last.originTypeIndex == rangeStack.top().originTypeIndex) {
-                last.size = currentUsage;
-                last.delta += event.numericData1;
+            if (!rangeStack.empty() && type.detailType == last.type &&
+                    last.originTypeIndex == rangeStack.top().originTypeIndex &&
+                    rangeStack.top().startTime < d->range(currentUsageIndex).start) {
+                last.update(event.numericData1);
+                currentUsage = last.size;
             } else {
-                MemoryAllocation allocation = {
-                    QmlDebug::SmallItem,
-                    currentUsage,
-                    event.numericData1,
-                    rangeStack.empty() ? -1 : rangeStack.top().originTypeIndex
-                };
+                MemoryAllocation allocation(QmlDebug::SmallItem, currentUsage,
+                        rangeStack.empty() ? -1 : rangeStack.top().originTypeIndex);
+                allocation.update(event.numericData1);
+                currentUsage = allocation.size;
+
                 if (currentUsageIndex != -1) {
                     d->insertEnd(currentUsageIndex,
                                  event.startTime - d->range(currentUsageIndex).start - 1);
@@ -228,18 +233,17 @@ void MemoryUsageModel::loadData()
         }
 
         if (type.detailType == QmlDebug::HeapPage || type.detailType == QmlDebug::LargeItem) {
-            currentSize += event.numericData1;
             MemoryAllocation &last = currentJSHeapIndex > -1 ? d->data(currentJSHeapIndex) : dummy;
-            if (!rangeStack.empty() && last.originTypeIndex == rangeStack.top().originTypeIndex) {
-                last.size = currentSize;
-                last.delta += event.numericData1;
+            if (!rangeStack.empty() && type.detailType == last.type &&
+                    last.originTypeIndex == rangeStack.top().originTypeIndex &&
+                    rangeStack.top().startTime < d->range(currentJSHeapIndex).start) {
+                last.update(event.numericData1);
+                currentSize = last.size;
             } else {
-                MemoryAllocation allocation = {
-                    (QmlDebug::MemoryType)type.detailType,
-                    currentSize,
-                    event.numericData1,
-                    rangeStack.empty() ? -1 : rangeStack.top().originTypeIndex
-                };
+                MemoryAllocation allocation((QmlDebug::MemoryType)type.detailType, currentSize,
+                        rangeStack.empty() ? -1 : rangeStack.top().originTypeIndex);
+                allocation.update(event.numericData1);
+                currentSize = allocation.size;
 
                 if (currentSize > d->maxSize)
                     d->maxSize = currentSize;
@@ -286,6 +290,25 @@ QString MemoryUsageModel::MemoryUsageModelPrivate::memoryTypeName(int type)
     }
 }
 
+MemoryUsageModel::MemoryAllocation::MemoryAllocation(QmlDebug::MemoryType type, qint64 baseAmount,
+                                                     int originTypeIndex) :
+    type(type), size(baseAmount), allocated(0), deallocated(0), allocations(0), deallocations(0),
+    originTypeIndex(originTypeIndex)
+{
+}
+
+void MemoryUsageModel::MemoryAllocation::update(qint64 amount)
+{
+    size += amount;
+    if (amount < 0) {
+        deallocated += amount;
+        ++deallocations;
+    } else {
+        allocated += amount;
+        ++allocations;
+    }
+}
+
 
 } // namespace Internal
 } // namespace QmlProfilerExtension

plugins/qmlprofilerextension/memoryusagemodel.h

@@ -37,8 +37,15 @@ public:
     struct MemoryAllocation {
         QmlDebug::MemoryType type;
         qint64 size;
-        qint64 delta;
+        qint64 allocated;
+        qint64 deallocated;
+        int allocations;
+        int deallocations;
         int originTypeIndex;
+
+        MemoryAllocation(QmlDebug::MemoryType type = QmlDebug::MaximumMemoryType,
+                         qint64 baseAmount = 0, int originTypeIndex = -1);
+        void update(qint64 amount);
     };
 
     MemoryUsageModel(QObject *parent = 0);