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) || USE(GLIB) || PLATFORM(QT)
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 m_didSyncGCRecently = false;
48
49#if !PLATFORM(IOS)
50 double startTime = WTF::monotonicallyIncreasingTime();
51 if (heap.isPagedOut(startTime + pagingTimeOut)) {
52 cancel();
53 heap.increaseLastFullGCLength(pagingTimeOut);
54 return;
55 }
56#endif
57
58 heap.collect(FullCollection);
59}
60
61double FullGCActivityCallback::lastGCLength()
62{
63 return m_vm->heap.lastFullGCLength();
64}
65
66double FullGCActivityCallback::deathRate()
67{
68 Heap* heap = &m_vm->heap;
69 size_t sizeBefore = heap->sizeBeforeLastFullCollection();
70 size_t sizeAfter = heap->sizeAfterLastFullCollection();
71 if (!sizeBefore)
72 return 1.0;
73 if (sizeAfter > sizeBefore) {
74 // GC caused the heap to grow(!)
75 // This could happen if the we visited more extra memory than was reported allocated.
76 // We don't return a negative death rate, since that would schedule the next GC in the past.
77 return 0;
78 }
79 return static_cast<double>(sizeBefore - sizeAfter) / static_cast<double>(sizeBefore);
80}
81
82double FullGCActivityCallback::gcTimeSlice(size_t bytes)
83{
84 return std::min((static_cast<double>(bytes) / MB) * Options::percentCPUPerMBForFullTimer(), Options::collectionTimerMaxPercentCPU());
85}
86
87#else
88
89FullGCActivityCallback::FullGCActivityCallback(Heap* heap)
90 : GCActivityCallback(heap)
91{
92}
93
94void FullGCActivityCallback::doCollection()
95{
96}
97
98double FullGCActivityCallback::lastGCLength()
99{
100 return 0;
101}
102
103double FullGCActivityCallback::deathRate()
104{
105 return 0;
106}
107
108double FullGCActivityCallback::gcTimeSlice(size_t)
109{
110 return 0;
111}
112
113#endif // USE(CF) || PLATFORM(EFL)
114
115} // namespace JSC
116