1 /* 2 * Copyright 2010 The Android Open Source Project 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * * Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "config.h" 27 #include "MemoryUsage.h" 28 29 #include <malloc.h> 30 #include <wtf/CurrentTime.h> 31 32 #include <v8.h> 33 34 using namespace WTF; 35 36 class MemoryUsageCache { 37 public: 38 MemoryUsageCache() 39 : m_cachedMemoryUsage(0) 40 , m_cacheTime(0) 41 { 42 } 43 44 int getCachedMemoryUsage(bool forceFresh); 45 46 private: 47 unsigned m_cachedMemoryUsage; 48 double m_cacheTime; 49 static const int CACHE_VALIDITY_MS = 2000; 50 }; 51 52 int MemoryUsageCache::getCachedMemoryUsage(bool forceFresh) 53 { 54 if (!forceFresh && currentTimeMS() <= m_cacheTime + CACHE_VALIDITY_MS) 55 return m_cachedMemoryUsage; 56 57 struct mallinfo minfo = mallinfo(); 58 m_cachedMemoryUsage = (minfo.hblkhd + minfo.arena) >> 20; 59 60 v8::HeapStatistics stat; 61 v8::V8::GetHeapStatistics(&stat); 62 unsigned v8Usage = stat.total_heap_size() >> 20; 63 m_cachedMemoryUsage += v8Usage; 64 65 m_cacheTime = currentTimeMS(); 66 return m_cachedMemoryUsage; 67 } 68 69 int MemoryUsage::memoryUsageMb(bool forceFresh) 70 { 71 static MemoryUsageCache cache; 72 return cache.getCachedMemoryUsage(forceFresh); 73 } 74 75 int MemoryUsage::m_lowMemoryUsageMb = 0; 76 int MemoryUsage::m_highMemoryUsageMb = 0; 77 int MemoryUsage::m_highUsageDeltaMb = 0; 78
