Basic performance monitor for tiles

Change-Id: Ic67a5093a7c09b870ec34160ae0c999162dddcfc

1 files changed, 81 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/android/PerformanceMonitor.cpp b/Source/WebCore/platform/graphics/android/PerformanceMonitor.cpp
new file mode 100644
index 0000000..20d1299
--- /dev/null
+++ b/Source/WebCore/platform/graphics/android/PerformanceMonitor.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2011, The Android Open Source Project
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "PerformanceMonitor.h"
+
+#include <wtf/text/CString.h>
+
+namespace WebCore {
+
+PerformanceMonitor::PerformanceMonitor()
+{
+}
+
+PerformanceMonitor::~PerformanceMonitor()
+{
+}
+
+void PerformanceMonitor::start(const String &tag)
+{
+    if (tag.isEmpty())
+        return;
+    PerfItem *item;
+    if (m_tags.contains(tag))
+        item = m_tags.get(tag);
+    else {
+        item = new PerfItem();
+        m_tags.set(tag, item);
+    }
+    gettimeofday(&(item->start_time), NULL);
+}
+
+void PerformanceMonitor::stop(const String &tag)
+{
+    if (!m_tags.contains(tag))
+        return;
+    PerfItem *item = m_tags.get(tag);
+    struct timeval end;
+    gettimeofday(&end, NULL);
+    long seconds, useconds;
+    seconds  = end.tv_sec  - item->start_time.tv_sec;
+    useconds = end.tv_usec - item->start_time.tv_usec;
+
+    float mtime = (seconds * 1000.0) + (useconds/1000.0);
+
+    float avg = 0;
+    if (item->average_ms) {
+        item->average_ms = (item->average_ms + mtime) / 2;
+    } else
+        item->average_ms = mtime;
+}
+
+float PerformanceMonitor::getAverageDuration(const String &tag)
+{
+    if (tag.isEmpty() || !m_tags.contains(tag))
+        return 0;
+    return m_tags.get(tag)->average_ms;
+}
+
+} // namespace WebCore