1/*
2 * Copyright (C) 2014-2017 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 "EdenGCActivityCallback.h"
28#include "HeapInlines.h"
29
30#include "VM.h"
31
32namespace JSC {
33
34EdenGCActivityCallback::EdenGCActivityCallback(Heap* heap)
35 : GCActivityCallback(heap)
36{
37}
38
39void EdenGCActivityCallback::doCollection(VM& vm)
40{
41 vm.heap.collectAsync(CollectionScope::Eden);
42}
43
44Seconds EdenGCActivityCallback::lastGCLength(Heap& heap)
45{
46 return heap.lastEdenGCLength();
47}
48
49double EdenGCActivityCallback::deathRate(Heap& heap)
50{
51 size_t sizeBefore = heap.sizeBeforeLastEdenCollection();
52 size_t sizeAfter = heap.sizeAfterLastEdenCollection();
53 if (!sizeBefore)
54 return 1.0;
55 if (sizeAfter > sizeBefore) {
56 // GC caused the heap to grow(!)
57 // This could happen if the we visited more extra memory than was reported allocated.
58 // We don't return a negative death rate, since that would schedule the next GC in the past.
59 return 0;
60 }
61 return static_cast<double>(sizeBefore - sizeAfter) / static_cast<double>(sizeBefore);
62}
63
64double EdenGCActivityCallback::gcTimeSlice(size_t bytes)
65{
66 return std::min((static_cast<double>(bytes) / MB) * Options::percentCPUPerMBForEdenTimer(), Options::collectionTimerMaxPercentCPU());
67}
68
69} // namespace JSC
70