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