1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define ATRACE_TAG ATRACE_TAG_DALVIK
#include <stdio.h>
#include <cutils/trace.h>
#include "garbage_collector.h"
#include "base/logging.h"
#include "base/mutex-inl.h"
#include "gc/accounting/heap_bitmap.h"
#include "gc/space/large_object_space.h"
#include "gc/space/space-inl.h"
#include "thread.h"
#include "thread_list.h"
namespace art {
namespace gc {
namespace collector {
GarbageCollector::GarbageCollector(Heap* heap, const std::string& name)
: heap_(heap),
name_(name),
verbose_(VLOG_IS_ON(heap)),
duration_ns_(0),
timings_(name_.c_str(), true, verbose_),
cumulative_timings_(name) {
ResetCumulativeStatistics();
}
bool GarbageCollector::HandleDirtyObjectsPhase() {
DCHECK(IsConcurrent());
return true;
}
void GarbageCollector::RegisterPause(uint64_t nano_length) {
pause_times_.push_back(nano_length);
}
void GarbageCollector::ResetCumulativeStatistics() {
cumulative_timings_.Reset();
total_time_ns_ = 0;
total_paused_time_ns_ = 0;
total_freed_objects_ = 0;
total_freed_bytes_ = 0;
}
void GarbageCollector::Run() {
Thread* self = Thread::Current();
ThreadList* thread_list = Runtime::Current()->GetThreadList();
uint64_t start_time = NanoTime();
pause_times_.clear();
duration_ns_ = 0;
InitializePhase();
if (!IsConcurrent()) {
// Pause is the entire length of the GC.
uint64_t pause_start = NanoTime();
ATRACE_BEGIN("Application threads suspended");
thread_list->SuspendAll();
MarkingPhase();
ReclaimPhase();
thread_list->ResumeAll();
ATRACE_END();
uint64_t pause_end = NanoTime();
pause_times_.push_back(pause_end - pause_start);
} else {
{
ReaderMutexLock mu(self, *Locks::mutator_lock_);
MarkingPhase();
}
bool done = false;
while (!done) {
uint64_t pause_start = NanoTime();
ATRACE_BEGIN("Application threads suspended");
thread_list->SuspendAll();
done = HandleDirtyObjectsPhase();
thread_list->ResumeAll();
ATRACE_END();
uint64_t pause_end = NanoTime();
pause_times_.push_back(pause_end - pause_start);
}
{
ReaderMutexLock mu(self, *Locks::mutator_lock_);
ReclaimPhase();
}
}
uint64_t end_time = NanoTime();
duration_ns_ = end_time - start_time;
FinishPhase();
}
void GarbageCollector::SwapBitmaps() {
// Swap the live and mark bitmaps for each alloc space. This is needed since sweep re-swaps
// these bitmaps. The bitmap swapping is an optimization so that we do not need to clear the live
// bits of dead objects in the live bitmap.
const GcType gc_type = GetGcType();
const std::vector<space::ContinuousSpace*>& cont_spaces = GetHeap()->GetContinuousSpaces();
// TODO: C++0x
typedef std::vector<space::ContinuousSpace*>::const_iterator It;
for (It it = cont_spaces.begin(), end = cont_spaces.end(); it != end; ++it) {
space::ContinuousSpace* space = *it;
// We never allocate into zygote spaces.
if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect ||
(gc_type == kGcTypeFull &&
space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) {
accounting::SpaceBitmap* live_bitmap = space->GetLiveBitmap();
accounting::SpaceBitmap* mark_bitmap = space->GetMarkBitmap();
if (live_bitmap != mark_bitmap) {
heap_->GetLiveBitmap()->ReplaceBitmap(live_bitmap, mark_bitmap);
heap_->GetMarkBitmap()->ReplaceBitmap(mark_bitmap, live_bitmap);
space->AsDlMallocSpace()->SwapBitmaps();
}
}
}
const std::vector<space::DiscontinuousSpace*>& disc_spaces = GetHeap()->GetDiscontinuousSpaces();
// TODO: C++0x
typedef std::vector<space::DiscontinuousSpace*>::const_iterator It2;
for (It2 it = disc_spaces.begin(), end = disc_spaces.end(); it != end; ++it) {
space::LargeObjectSpace* space = down_cast<space::LargeObjectSpace*>(*it);
accounting::SpaceSetMap* live_set = space->GetLiveObjects();
accounting::SpaceSetMap* mark_set = space->GetMarkObjects();
heap_->GetLiveBitmap()->ReplaceObjectSet(live_set, mark_set);
heap_->GetMarkBitmap()->ReplaceObjectSet(mark_set, live_set);
space->SwapBitmaps();
}
}
} // namespace collector
} // namespace gc
} // namespace art
|
