1 files changed, 81 insertions, 0 deletions
diff --git a/WebKit/android/WebCoreSupport/MemoryUsage.cpp b/WebKit/android/WebCoreSupport/MemoryUsage.cpp
new file mode 100644
index 0000000..f799a18
--- /dev/null
+++ b/WebKit/android/WebCoreSupport/MemoryUsage.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2010 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 "config.h"
+#include "MemoryUsage.h"
+
+#include <malloc.h>
+#include <wtf/CurrentTime.h>
+
+#if USE(V8)
+#include <v8.h>
+#endif // USE(V8)
+
+using namespace WTF;
+
+class MemoryUsageCache {
+public:
+    MemoryUsageCache()
+        : m_cachedMemoryUsage(0)
+        , m_cacheTime(0)
+    {
+    }
+
+    int getCachedMemoryUsage(bool forceFresh);
+
+private:
+    unsigned m_cachedMemoryUsage;
+    double m_cacheTime;
+    static const int CACHE_VALIDITY_MS = 2000;
+};
+
+int MemoryUsageCache::getCachedMemoryUsage(bool forceFresh)
+{
+    if (!forceFresh && currentTimeMS() <= m_cacheTime + CACHE_VALIDITY_MS)
+        return m_cachedMemoryUsage;
+
+    struct mallinfo minfo = mallinfo();
+    m_cachedMemoryUsage = (minfo.hblkhd + minfo.arena) >> 20;
+
+#if USE(V8)
+    v8::HeapStatistics stat;
+    v8::V8::GetHeapStatistics(&stat);
+    unsigned v8Usage = stat.total_heap_size() >> 20;
+    m_cachedMemoryUsage += v8Usage;
+#endif // USE(V8)
+
+    m_cacheTime = currentTimeMS();
+    return m_cachedMemoryUsage;
+}
+
+int MemoryUsage::memoryUsageMb(bool forceFresh)
+{
+    static MemoryUsageCache cache;
+    return cache.getCachedMemoryUsage(forceFresh);
+}
+
+int MemoryUsage::m_lowMemoryUsageMb = 0;
+int MemoryUsage::m_highMemoryUsageMb = 0;
+