/* * Copyright (C) 2014-2017 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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 APPLE INC. AND ITS CONTRIBUTORS ``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 APPLE INC. OR ITS 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 "FullGCActivityCallback.h" #include "VM.h" namespace JSC { #if !PLATFORM(IOS_FAMILY) const constexpr Seconds pagingTimeOut { 100_ms }; // Time in seconds to allow opportunistic timer to iterate over all blocks to see if the Heap is paged out. #endif FullGCActivityCallback::FullGCActivityCallback(Heap* heap) : GCActivityCallback(heap) { } void FullGCActivityCallback::doCollection(VM& vm) { Heap& heap = vm.heap; m_didGCRecently = false; #if !PLATFORM(IOS_FAMILY) MonotonicTime startTime = MonotonicTime::now(); if (heap.isPagedOut(startTime + pagingTimeOut)) { cancel(); heap.increaseLastFullGCLength(pagingTimeOut); return; } #endif heap.collectAsync(CollectionScope::Full); } Seconds FullGCActivityCallback::lastGCLength(Heap& heap) { return heap.lastFullGCLength(); } double FullGCActivityCallback::deathRate(Heap& heap) { size_t sizeBefore = heap.sizeBeforeLastFullCollection(); size_t sizeAfter = heap.sizeAfterLastFullCollection(); if (!sizeBefore) return 1.0; if (sizeAfter > sizeBefore) { // GC caused the heap to grow(!) // This could happen if the we visited more extra memory than was reported allocated. // We don't return a negative death rate, since that would schedule the next GC in the past. return 0; } return static_cast<double>(sizeBefore - sizeAfter) / static_cast<double>(sizeBefore); } double FullGCActivityCallback::gcTimeSlice(size_t bytes) { return std::min((static_cast<double>(bytes) / MB) * Options::percentCPUPerMBForFullTimer(), Options::collectionTimerMaxPercentCPU()); } } // namespace JSC