Source/WebKit/android/WebCoreSupport/MemoryUsage.cpp

/*
 * 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 <v8.h>

// Workaround an issue where malloc_footprint is in malloc.h
// but is not actually implemented.
// See: http://code.google.com/p/android/issues/detail?id=34897
extern "C" size_t dlmalloc_footprint(void);

using namespace WTF;

int MemoryUsage::memoryUsageMb(bool /* forceFresh */)
{
    size_t footprint = dlmalloc_footprint() >> 20;
    v8::HeapStatistics stat;
    v8::V8::GetHeapStatistics(&stat);
    unsigned v8Usage = stat.total_heap_size() >> 20;
    return footprint + v8Usage;
}

int MemoryUsage::m_lowMemoryUsageMb = 0;
int MemoryUsage::m_highMemoryUsageMb = 0;
int MemoryUsage::m_highUsageDeltaMb = 0;