| /* |
| * 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 { |
| |
| FullGCActivityCallback::FullGCActivityCallback(Heap* heap) |
| : GCActivityCallback(heap) |
| { |
| } |
| |
| void FullGCActivityCallback::doCollection(VM& vm) |
| { |
| Heap& heap = vm.heap; |
| m_didGCRecently = false; |
| |
| #if !PLATFORM(IOS_FAMILY) || PLATFORM(MACCATALYST) |
| MonotonicTime startTime = MonotonicTime::now(); |
| if (heap.isPagedOut()) { |
| cancel(); |
| heap.increaseLastFullGCLength(MonotonicTime::now() - startTime); |
| 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 |