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 "EdenGCActivityCallback.h"
28
29#include "VM.h"
30
31namespace JSC {
32
33#if USE(CF) || USE(GLIB) || PLATFORM(QT)
34
35EdenGCActivityCallback::EdenGCActivityCallback(Heap* heap)
36 : GCActivityCallback(heap)
37{
38}
39
40void EdenGCActivityCallback::doCollection()
41{
42 m_vm->heap.collect(EdenCollection);
43}
44
45double EdenGCActivityCallback::lastGCLength()
46{
47 return m_vm->heap.lastEdenGCLength();
48}
49
50double EdenGCActivityCallback::deathRate()
51{
52 Heap* heap = &m_vm->heap;
53 size_t sizeBefore = heap->sizeBeforeLastEdenCollection();
54 size_t sizeAfter = heap->sizeAfterLastEdenCollection();
55 if (!sizeBefore)
56 return 1.0;
57 if (sizeAfter > sizeBefore) {
58 // GC caused the heap to grow(!)
59 // This could happen if the we visited more extra memory than was reported allocated.
60 // We don't return a negative death rate, since that would schedule the next GC in the past.
61 return 0;
62 }
63 return static_cast<double>(sizeBefore - sizeAfter) / static_cast<double>(sizeBefore);
64}
65
66double EdenGCActivityCallback::gcTimeSlice(size_t bytes)
67{
68 return std::min((static_cast<double>(bytes) / MB) * Options::percentCPUPerMBForEdenTimer(), Options::collectionTimerMaxPercentCPU());
69}
70
71#else
72
73EdenGCActivityCallback::EdenGCActivityCallback(Heap* heap)
74 : GCActivityCallback(heap->vm())
75{
76}
77
78void EdenGCActivityCallback::doCollection()
79{
80}
81
82double EdenGCActivityCallback::lastGCLength()
83{
84 return 0;
85}
86
87double EdenGCActivityCallback::deathRate()
88{
89 return 0;
90}
91
92double EdenGCActivityCallback::gcTimeSlice(size_t)
93{
94 return 0;
95}
96
97#endif // USE(CF) || PLATFORM(EFL)
98
99} // namespace JSC
100