1/* 2 * Copyright (C) 2014 Apple Inc. All rights reserved. 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 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. 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 APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "FullGCActivityCallback.h" 28 29#include "VM.h" 30 31namespace JSC { 32 33#if USE(CF) || PLATFORM(EFL) 34 35#if !PLATFORM(IOS) 36const double pagingTimeOut = 0.1; // Time in seconds to allow opportunistic timer to iterate over all blocks to see if the Heap is paged out. 37#endif 38 39FullGCActivityCallback::FullGCActivityCallback(Heap* heap) 40 : GCActivityCallback(heap) 41{ 42} 43 44void FullGCActivityCallback::doCollection() 45{ 46 Heap* heap = &m_vm->heap; 47 48#if !PLATFORM(IOS) 49 double startTime = WTF::monotonicallyIncreasingTime(); 50 if (heap->isPagedOut(startTime + pagingTimeOut)) { 51 cancel(); 52 heap->increaseLastFullGCLength(pagingTimeOut); 53 return; 54 } 55#endif 56 57 heap->collect(FullCollection); 58} 59 60double FullGCActivityCallback::lastGCLength() 61{ 62 return m_vm->heap.lastFullGCLength(); 63} 64 65double FullGCActivityCallback::deathRate() 66{ 67 Heap* heap = &m_vm->heap; 68 size_t sizeBefore = heap->sizeBeforeLastFullCollection(); 69 size_t sizeAfter = heap->sizeAfterLastFullCollection(); 70 if (!sizeBefore) 71 return 1.0; 72 return static_cast<double>(sizeBefore - sizeAfter) / static_cast<double>(sizeBefore); 73} 74 75double FullGCActivityCallback::gcTimeSlice(size_t bytes) 76{ 77 return std::min((static_cast<double>(bytes) / MB) * Options::percentCPUPerMBForFullTimer(), Options::collectionTimerMaxPercentCPU()); 78} 79 80#else 81 82FullGCActivityCallback::FullGCActivityCallback(Heap* heap) 83 : GCActivityCallback(heap) 84{ 85} 86 87void FullGCActivityCallback::doCollection() 88{ 89} 90 91double FullGCActivityCallback::lastGCLength() 92{ 93 return 0; 94} 95 96double FullGCActivityCallback::deathRate() 97{ 98 return 0; 99} 100 101double FullGCActivityCallback::gcTimeSlice(size_t) 102{ 103 return 0; 104} 105 106#endif // USE(CF) || PLATFORM(EFL) 107 108} // namespace JSC 109