From 53484b27fe6e64dde4b27016869ef4c6c5e8c27f Mon Sep 17 00:00:00 2001
From: Zack Rusin <zack@kde.org>
Date: Sat, 16 Apr 2011 11:56:19 -0400
Subject: [PATCH] Reduce the memory usage by ~2gb on a 2.7 million calls trace

delete the parsed data from blobs and delay the creation of the static
text until the item is actually shown (i.e. don't create glyph caches
for items that will never be displayed!)
---
 gui/apitracecall.cpp | 54 ++++++++++++++++++++++++++++++++------------
 gui/apitracecall.h   |  6 ++---
 2 files changed, 42 insertions(+), 18 deletions(-)

diff --git a/gui/apitracecall.cpp b/gui/apitracecall.cpp
index 32e78b5..4641807 100644
--- a/gui/apitracecall.cpp
+++ b/gui/apitracecall.cpp
@@ -242,10 +242,11 @@ void ApiArray::init(const Trace::Array *arr)
 
 QStaticText ApiTraceCall::staticText() const
 {
-    if (!m_staticText.text().isEmpty())
-        return m_staticText;
+    if (m_staticText && !m_staticText->text().isEmpty())
+        return *m_staticText;
 
-    QString richText = QString::fromLatin1("<span style=\"font-weight:bold\">%1</span>(").arg(m_name);
+    QString richText = QString::fromLatin1(
+        "<span style=\"font-weight:bold\">%1</span>(").arg(m_name);
     for (int i = 0; i < m_argNames.count(); ++i) {
         richText += QLatin1String("<span style=\"color:#0000ff\">");
         QString argText = apiVariantToString(m_argValues[i]);
@@ -275,13 +276,14 @@ QStaticText ApiTraceCall::staticText() const
         richText += QLatin1String("</span>");
     }
 
-    m_staticText.setText(richText);
+    if (!m_staticText)
+        m_staticText = new QStaticText(richText);
     QTextOption opt;
     opt.setWrapMode(QTextOption::NoWrap);
-    m_staticText.setTextOption(opt);
-    m_staticText.prepare();
+    m_staticText->setTextOption(opt);
+    m_staticText->prepare();
 
-    return m_staticText;
+    return *m_staticText;
 }
 
 QString ApiTraceCall::toHtml() const
@@ -352,19 +354,21 @@ QString ApiTraceCall::filterText() const
 
 QStaticText ApiTraceFrame::staticText() const
 {
-    if (!m_staticText.text().isEmpty())
-        return m_staticText;
+    if (m_staticText && !m_staticText->text().isEmpty())
+        return *m_staticText;
 
     QString richText =
         QString::fromLatin1("<span style=\"font-weight:bold\">Frame %1</span>").arg(number);
 
-    m_staticText.setText(richText);
+    if (!m_staticText)
+        m_staticText = new QStaticText(richText);
+
     QTextOption opt;
     opt.setWrapMode(QTextOption::NoWrap);
-    m_staticText.setTextOption(opt);
-    m_staticText.prepare();
+    m_staticText->setTextOption(opt);
+    m_staticText->prepare();
 
-    return m_staticText;
+    return *m_staticText;
 }
 
 int ApiTraceCall::numChildren() const
@@ -390,12 +394,14 @@ ApiTraceCall::ApiTraceCall()
 }
 
 ApiTraceEvent::ApiTraceEvent()
-    : m_type(ApiTraceEvent::None)
+    : m_type(ApiTraceEvent::None),
+      m_staticText(0)
 {
 }
 
 ApiTraceEvent::ApiTraceEvent(Type t)
-    : m_type(t)
+    : m_type(t),
+      m_staticText(0)
 {
 }
 
@@ -594,6 +600,19 @@ ApiTraceCall::ApiTraceCall(const Trace::Call *call)
         VariantVisitor argVisitor;
         call->args[i]->visit(argVisitor);
         m_argValues += argVisitor.variant();
+
+        //XXX
+        //FIXME: this is a nasty hack. Trace::Blob's can't
+        //   delete the contents in the destructor because
+        //   the data is being used by other calls. we should
+        //   use something like Boost's shared_ptr or
+        //   Qt's QSharedPointer to handle it.
+        Trace::Blob *b = dynamic_cast<Trace::Blob*>(call->args[i]);
+        if (b && b->blob()) {
+            char *buf = (char*)b->blob();
+            delete [] buf;
+        }
+
     }
 }
 
@@ -612,3 +631,8 @@ ApiTraceFrame * ApiTraceCall::parentFrame()const
     return m_parentFrame;
 }
 
+ApiTraceEvent::~ApiTraceEvent()
+{
+    delete m_staticText;
+}
+
diff --git a/gui/apitracecall.h b/gui/apitracecall.h
index 1cabcec..e399bc6 100644
--- a/gui/apitracecall.h
+++ b/gui/apitracecall.h
@@ -135,6 +135,7 @@ public:
 public:
     ApiTraceEvent();
     ApiTraceEvent(Type t);
+    virtual ~ApiTraceEvent();
 
     Type type() const { return m_type; }
 
@@ -148,6 +149,8 @@ public:
 protected:
     Type m_type;
     ApiTraceState m_state;
+
+    mutable QStaticText *m_staticText;
 };
 Q_DECLARE_METATYPE(ApiTraceEvent*);
 
@@ -185,7 +188,6 @@ private:
 
     mutable QString m_richText;
     mutable QString m_filterText;
-    mutable QStaticText m_staticText;
     mutable bool m_hasBinaryData;
     mutable int m_binaryDataIndex;
 };
@@ -200,8 +202,6 @@ public:
 
     int numChildren() const;
     QStaticText staticText() const;
-private:
-    mutable QStaticText m_staticText;
 };
 Q_DECLARE_METATYPE(ApiTraceFrame*);
 
-- 
2.43.0