Elliott Hughes | 2faa5f1 | 2012-01-30 14:42:07 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 16 | |
Brian Carlstrom | 578bbdc | 2011-07-21 14:07:47 -0700 | [diff] [blame] | 17 | #include "mark_sweep.h" |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 18 | |
Yabin Cui | c7df66e | 2015-04-15 15:40:18 -0700 | [diff] [blame] | 19 | #include <atomic> |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 20 | #include <functional> |
| 21 | #include <numeric> |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 22 | #include <climits> |
| 23 | #include <vector> |
| 24 | |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 25 | #include "base/bounded_fifo.h" |
Andreas Gampe | 542451c | 2016-07-26 09:02:02 -0700 | [diff] [blame] | 26 | #include "base/enums.h" |
Elliott Hughes | 07ed66b | 2012-12-12 18:34:25 -0800 | [diff] [blame] | 27 | #include "base/logging.h" |
Elliott Hughes | 7616005 | 2012-12-12 16:31:20 -0800 | [diff] [blame] | 28 | #include "base/macros.h" |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame] | 29 | #include "base/mutex-inl.h" |
Mathieu Chartier | 32ce2ad | 2016-03-04 14:58:03 -0800 | [diff] [blame] | 30 | #include "base/systrace.h" |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 31 | #include "base/time_utils.h" |
Sameer Abu Asal | a843954 | 2013-02-14 16:06:42 -0800 | [diff] [blame] | 32 | #include "base/timing_logger.h" |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 33 | #include "gc/accounting/card_table-inl.h" |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 34 | #include "gc/accounting/heap_bitmap-inl.h" |
Mathieu Chartier | 11409ae | 2013-09-23 11:49:36 -0700 | [diff] [blame] | 35 | #include "gc/accounting/mod_union_table.h" |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 36 | #include "gc/accounting/space_bitmap-inl.h" |
| 37 | #include "gc/heap.h" |
Mathieu Chartier | 78f7b4c | 2014-05-06 10:57:27 -0700 | [diff] [blame] | 38 | #include "gc/reference_processor.h" |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 39 | #include "gc/space/large_object_space.h" |
| 40 | #include "gc/space/space-inl.h" |
Ian Rogers | 2dd0e2c | 2013-01-24 12:42:14 -0800 | [diff] [blame] | 41 | #include "mark_sweep-inl.h" |
Ian Rogers | 2dd0e2c | 2013-01-24 12:42:14 -0800 | [diff] [blame] | 42 | #include "mirror/object-inl.h" |
Brian Carlstrom | 1f87008 | 2011-08-23 16:02:11 -0700 | [diff] [blame] | 43 | #include "runtime.h" |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 44 | #include "scoped_thread_state_change.h" |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 45 | #include "thread-inl.h" |
Mathieu Chartier | 6f1c949 | 2012-10-15 12:08:41 -0700 | [diff] [blame] | 46 | #include "thread_list.h" |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 47 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 48 | namespace art { |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 49 | namespace gc { |
| 50 | namespace collector { |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 51 | |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 52 | // Performance options. |
Mathieu Chartier | eb7bbad | 2014-02-25 15:52:46 -0800 | [diff] [blame] | 53 | static constexpr bool kUseRecursiveMark = false; |
| 54 | static constexpr bool kUseMarkStackPrefetch = true; |
| 55 | static constexpr size_t kSweepArrayChunkFreeSize = 1024; |
| 56 | static constexpr bool kPreCleanCards = true; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 57 | |
| 58 | // Parallelism options. |
Mathieu Chartier | eb7bbad | 2014-02-25 15:52:46 -0800 | [diff] [blame] | 59 | static constexpr bool kParallelCardScan = true; |
| 60 | static constexpr bool kParallelRecursiveMark = true; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 61 | // Don't attempt to parallelize mark stack processing unless the mark stack is at least n |
| 62 | // elements. This is temporary until we reduce the overhead caused by allocating tasks, etc.. Not |
| 63 | // having this can add overhead in ProcessReferences since we may end up doing many calls of |
| 64 | // ProcessMarkStack with very small mark stacks. |
Mathieu Chartier | eb7bbad | 2014-02-25 15:52:46 -0800 | [diff] [blame] | 65 | static constexpr size_t kMinimumParallelMarkStackSize = 128; |
| 66 | static constexpr bool kParallelProcessMarkStack = true; |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 67 | |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 68 | // Profiling and information flags. |
Mathieu Chartier | eb7bbad | 2014-02-25 15:52:46 -0800 | [diff] [blame] | 69 | static constexpr bool kProfileLargeObjects = false; |
| 70 | static constexpr bool kMeasureOverhead = false; |
| 71 | static constexpr bool kCountTasks = false; |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 72 | static constexpr bool kCountMarkedObjects = false; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 73 | |
| 74 | // Turn off kCheckLocks when profiling the GC since it slows the GC down by up to 40%. |
Mathieu Chartier | eb7bbad | 2014-02-25 15:52:46 -0800 | [diff] [blame] | 75 | static constexpr bool kCheckLocks = kDebugLocking; |
Mathieu Chartier | 7bf9f19 | 2014-04-04 11:09:41 -0700 | [diff] [blame] | 76 | static constexpr bool kVerifyRootsMarked = kIsDebugBuild; |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 77 | |
Hiroshi Yamauchi | c93c530 | 2014-03-20 16:15:37 -0700 | [diff] [blame] | 78 | // If true, revoke the rosalloc thread-local buffers at the |
| 79 | // checkpoint, as opposed to during the pause. |
| 80 | static constexpr bool kRevokeRosAllocThreadLocalBuffersAtCheckpoint = true; |
| 81 | |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 82 | void MarkSweep::BindBitmaps() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 83 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 84 | WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 85 | // Mark all of the spaces we never collect as immune. |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 86 | for (const auto& space : GetHeap()->GetContinuousSpaces()) { |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 87 | if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyNeverCollect) { |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 88 | immune_spaces_.AddSpace(space); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 89 | } |
| 90 | } |
| 91 | } |
| 92 | |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 93 | MarkSweep::MarkSweep(Heap* heap, bool is_concurrent, const std::string& name_prefix) |
| 94 | : GarbageCollector(heap, |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 95 | name_prefix + |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 96 | (is_concurrent ? "concurrent mark sweep": "mark sweep")), |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 97 | current_space_bitmap_(nullptr), |
| 98 | mark_bitmap_(nullptr), |
| 99 | mark_stack_(nullptr), |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 100 | gc_barrier_(new Barrier(0)), |
Mathieu Chartier | 958291c | 2013-08-27 18:14:55 -0700 | [diff] [blame] | 101 | mark_stack_lock_("mark sweep mark stack lock", kMarkSweepMarkStackLock), |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 102 | is_concurrent_(is_concurrent), |
| 103 | live_stack_freeze_size_(0) { |
Hiroshi Yamauchi | bbdc5bc | 2014-05-28 14:04:59 -0700 | [diff] [blame] | 104 | std::string error_msg; |
| 105 | MemMap* mem_map = MemMap::MapAnonymous( |
| 106 | "mark sweep sweep array free buffer", nullptr, |
| 107 | RoundUp(kSweepArrayChunkFreeSize * sizeof(mirror::Object*), kPageSize), |
Vladimir Marko | 5c42c29 | 2015-02-25 12:02:49 +0000 | [diff] [blame] | 108 | PROT_READ | PROT_WRITE, false, false, &error_msg); |
Hiroshi Yamauchi | bbdc5bc | 2014-05-28 14:04:59 -0700 | [diff] [blame] | 109 | CHECK(mem_map != nullptr) << "Couldn't allocate sweep array free buffer: " << error_msg; |
| 110 | sweep_array_free_buffer_mem_map_.reset(mem_map); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | void MarkSweep::InitializePhase() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 114 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | eb8167a | 2014-05-07 15:43:14 -0700 | [diff] [blame] | 115 | mark_stack_ = heap_->GetMarkStack(); |
Mathieu Chartier | e53225c | 2013-08-19 10:59:11 -0700 | [diff] [blame] | 116 | DCHECK(mark_stack_ != nullptr); |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 117 | immune_spaces_.Reset(); |
Mathieu Chartier | 52a7f5c | 2015-08-18 18:35:52 -0700 | [diff] [blame] | 118 | no_reference_class_count_.StoreRelaxed(0); |
| 119 | normal_count_.StoreRelaxed(0); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 120 | class_count_.StoreRelaxed(0); |
Mathieu Chartier | 52a7f5c | 2015-08-18 18:35:52 -0700 | [diff] [blame] | 121 | object_array_count_.StoreRelaxed(0); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 122 | other_count_.StoreRelaxed(0); |
Mathieu Chartier | 52a7f5c | 2015-08-18 18:35:52 -0700 | [diff] [blame] | 123 | reference_count_.StoreRelaxed(0); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 124 | large_object_test_.StoreRelaxed(0); |
| 125 | large_object_mark_.StoreRelaxed(0); |
| 126 | overhead_time_ .StoreRelaxed(0); |
| 127 | work_chunks_created_.StoreRelaxed(0); |
| 128 | work_chunks_deleted_.StoreRelaxed(0); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 129 | mark_null_count_.StoreRelaxed(0); |
| 130 | mark_immune_count_.StoreRelaxed(0); |
| 131 | mark_fastpath_count_.StoreRelaxed(0); |
| 132 | mark_slowpath_count_.StoreRelaxed(0); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 133 | { |
Mathieu Chartier | eb8167a | 2014-05-07 15:43:14 -0700 | [diff] [blame] | 134 | // TODO: I don't think we should need heap bitmap lock to Get the mark bitmap. |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 135 | ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| 136 | mark_bitmap_ = heap_->GetMarkBitmap(); |
| 137 | } |
Mathieu Chartier | 10fb83a | 2014-06-15 15:15:43 -0700 | [diff] [blame] | 138 | if (!GetCurrentIteration()->GetClearSoftReferences()) { |
Hiroshi Yamauchi | df386c5 | 2014-04-08 16:21:52 -0700 | [diff] [blame] | 139 | // Always clear soft references if a non-sticky collection. |
Mathieu Chartier | 10fb83a | 2014-06-15 15:15:43 -0700 | [diff] [blame] | 140 | GetCurrentIteration()->SetClearSoftReferences(GetGcType() != collector::kGcTypeSticky); |
Hiroshi Yamauchi | df386c5 | 2014-04-08 16:21:52 -0700 | [diff] [blame] | 141 | } |
Mathieu Chartier | 6f365cc | 2014-04-23 12:42:27 -0700 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | void MarkSweep::RunPhases() { |
| 145 | Thread* self = Thread::Current(); |
| 146 | InitializePhase(); |
| 147 | Locks::mutator_lock_->AssertNotHeld(self); |
| 148 | if (IsConcurrent()) { |
| 149 | GetHeap()->PreGcVerification(this); |
| 150 | { |
| 151 | ReaderMutexLock mu(self, *Locks::mutator_lock_); |
| 152 | MarkingPhase(); |
| 153 | } |
| 154 | ScopedPause pause(this); |
| 155 | GetHeap()->PrePauseRosAllocVerification(this); |
| 156 | PausePhase(); |
| 157 | RevokeAllThreadLocalBuffers(); |
| 158 | } else { |
| 159 | ScopedPause pause(this); |
| 160 | GetHeap()->PreGcVerificationPaused(this); |
| 161 | MarkingPhase(); |
| 162 | GetHeap()->PrePauseRosAllocVerification(this); |
| 163 | PausePhase(); |
| 164 | RevokeAllThreadLocalBuffers(); |
| 165 | } |
| 166 | { |
| 167 | // Sweeping always done concurrently, even for non concurrent mark sweep. |
| 168 | ReaderMutexLock mu(self, *Locks::mutator_lock_); |
| 169 | ReclaimPhase(); |
| 170 | } |
| 171 | GetHeap()->PostGcVerification(this); |
| 172 | FinishPhase(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 173 | } |
| 174 | |
| 175 | void MarkSweep::ProcessReferences(Thread* self) { |
Mathieu Chartier | 8e56c7e | 2012-11-20 13:25:50 -0800 | [diff] [blame] | 176 | WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
Mathieu Chartier | 78f7b4c | 2014-05-06 10:57:27 -0700 | [diff] [blame] | 177 | GetHeap()->GetReferenceProcessor()->ProcessReferences( |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 178 | true, |
| 179 | GetTimings(), |
| 180 | GetCurrentIteration()->GetClearSoftReferences(), |
| 181 | this); |
Mathieu Chartier | 1ad2784 | 2014-03-19 17:08:17 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 184 | void MarkSweep::PausePhase() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 185 | TimingLogger::ScopedTiming t("(Paused)PausePhase", GetTimings()); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 186 | Thread* self = Thread::Current(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 187 | Locks::mutator_lock_->AssertExclusiveHeld(self); |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 188 | if (IsConcurrent()) { |
| 189 | // Handle the dirty objects if we are a concurrent GC. |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 190 | WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 191 | // Re-mark root set. |
| 192 | ReMarkRoots(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 193 | // Scan dirty objects, this is only required if we are not doing concurrent GC. |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 194 | RecursiveMarkDirtyObjects(true, accounting::CardTable::kCardDirty); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 195 | } |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 196 | { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 197 | TimingLogger::ScopedTiming t2("SwapStacks", GetTimings()); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 198 | WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
Mathieu Chartier | a4f6af9 | 2015-08-11 17:35:25 -0700 | [diff] [blame] | 199 | heap_->SwapStacks(); |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 200 | live_stack_freeze_size_ = heap_->GetLiveStack()->Size(); |
| 201 | // Need to revoke all the thread local allocation stacks since we just swapped the allocation |
| 202 | // stacks and don't want anybody to allocate into the live stack. |
Mathieu Chartier | c22c59e | 2014-02-24 15:16:06 -0800 | [diff] [blame] | 203 | RevokeAllThreadLocalAllocationStacks(self); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 204 | } |
Mathieu Chartier | 0f72e41 | 2013-09-06 16:40:01 -0700 | [diff] [blame] | 205 | heap_->PreSweepingGcVerification(this); |
Mathieu Chartier | 6f365cc | 2014-04-23 12:42:27 -0700 | [diff] [blame] | 206 | // Disallow new system weaks to prevent a race which occurs when someone adds a new system |
| 207 | // weak before we sweep them. Since this new system weak may not be marked, the GC may |
| 208 | // incorrectly sweep it. This also fixes a race where interning may attempt to return a strong |
| 209 | // reference to a string that is about to be swept. |
| 210 | Runtime::Current()->DisallowNewSystemWeaks(); |
Mathieu Chartier | 78f7b4c | 2014-05-06 10:57:27 -0700 | [diff] [blame] | 211 | // Enable the reference processing slow path, needs to be done with mutators paused since there |
| 212 | // is no lock in the GetReferent fast path. |
| 213 | GetHeap()->GetReferenceProcessor()->EnableSlowPath(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 214 | } |
| 215 | |
Mathieu Chartier | dda54f5 | 2014-02-24 09:58:40 -0800 | [diff] [blame] | 216 | void MarkSweep::PreCleanCards() { |
| 217 | // Don't do this for non concurrent GCs since they don't have any dirty cards. |
| 218 | if (kPreCleanCards && IsConcurrent()) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 219 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | dda54f5 | 2014-02-24 09:58:40 -0800 | [diff] [blame] | 220 | Thread* self = Thread::Current(); |
| 221 | CHECK(!Locks::mutator_lock_->IsExclusiveHeld(self)); |
| 222 | // Process dirty cards and add dirty cards to mod union tables, also ages cards. |
Lei Li | 4add3b4 | 2015-01-15 11:55:26 +0800 | [diff] [blame] | 223 | heap_->ProcessCards(GetTimings(), false, true, false); |
Mathieu Chartier | eb7bbad | 2014-02-25 15:52:46 -0800 | [diff] [blame] | 224 | // The checkpoint root marking is required to avoid a race condition which occurs if the |
| 225 | // following happens during a reference write: |
| 226 | // 1. mutator dirties the card (write barrier) |
| 227 | // 2. GC ages the card (the above ProcessCards call) |
| 228 | // 3. GC scans the object (the RecursiveMarkDirtyObjects call below) |
| 229 | // 4. mutator writes the value (corresponding to the write barrier in 1.) |
| 230 | // This causes the GC to age the card but not necessarily mark the reference which the mutator |
| 231 | // wrote into the object stored in the card. |
| 232 | // Having the checkpoint fixes this issue since it ensures that the card mark and the |
| 233 | // reference write are visible to the GC before the card is scanned (this is due to locks being |
| 234 | // acquired / released in the checkpoint code). |
| 235 | // The other roots are also marked to help reduce the pause. |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 236 | MarkRootsCheckpoint(self, false); |
Mathieu Chartier | dda54f5 | 2014-02-24 09:58:40 -0800 | [diff] [blame] | 237 | MarkNonThreadRoots(); |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 238 | MarkConcurrentRoots( |
| 239 | static_cast<VisitRootFlags>(kVisitRootFlagClearRootLog | kVisitRootFlagNewRoots)); |
Mathieu Chartier | dda54f5 | 2014-02-24 09:58:40 -0800 | [diff] [blame] | 240 | // Process the newly aged cards. |
| 241 | RecursiveMarkDirtyObjects(false, accounting::CardTable::kCardDirty - 1); |
| 242 | // TODO: Empty allocation stack to reduce the number of objects we need to test / mark as live |
| 243 | // in the next GC. |
| 244 | } |
| 245 | } |
| 246 | |
Mathieu Chartier | c22c59e | 2014-02-24 15:16:06 -0800 | [diff] [blame] | 247 | void MarkSweep::RevokeAllThreadLocalAllocationStacks(Thread* self) { |
| 248 | if (kUseThreadLocalAllocationStack) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 249 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | c22c59e | 2014-02-24 15:16:06 -0800 | [diff] [blame] | 250 | Locks::mutator_lock_->AssertExclusiveHeld(self); |
| 251 | heap_->RevokeAllThreadLocalAllocationStacks(self); |
| 252 | } |
| 253 | } |
| 254 | |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 255 | void MarkSweep::MarkingPhase() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 256 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 257 | Thread* self = Thread::Current(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 258 | BindBitmaps(); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 259 | FindDefaultSpaceBitmap(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 260 | // Process dirty cards and add dirty cards to mod union tables. |
Lei Li | 4add3b4 | 2015-01-15 11:55:26 +0800 | [diff] [blame] | 261 | // If the GC type is non sticky, then we just clear the cards instead of ageing them. |
| 262 | heap_->ProcessCards(GetTimings(), false, true, GetGcType() != kGcTypeSticky); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 263 | WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 264 | MarkRoots(self); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 265 | MarkReachableObjects(); |
Mathieu Chartier | dda54f5 | 2014-02-24 09:58:40 -0800 | [diff] [blame] | 266 | // Pre-clean dirtied cards to reduce pauses. |
| 267 | PreCleanCards(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 268 | } |
| 269 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 270 | class MarkSweep::ScanObjectVisitor { |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 271 | public: |
| 272 | explicit ScanObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE |
| 273 | : mark_sweep_(mark_sweep) {} |
| 274 | |
| 275 | void operator()(mirror::Object* obj) const |
| 276 | ALWAYS_INLINE |
| 277 | REQUIRES(Locks::heap_bitmap_lock_) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 278 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 279 | if (kCheckLocks) { |
| 280 | Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); |
| 281 | Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); |
| 282 | } |
| 283 | mark_sweep_->ScanObject(obj); |
| 284 | } |
| 285 | |
| 286 | private: |
| 287 | MarkSweep* const mark_sweep_; |
| 288 | }; |
| 289 | |
Mathieu Chartier | 11409ae | 2013-09-23 11:49:36 -0700 | [diff] [blame] | 290 | void MarkSweep::UpdateAndMarkModUnion() { |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 291 | for (const auto& space : immune_spaces_.GetSpaces()) { |
| 292 | const char* name = space->IsZygoteSpace() |
| 293 | ? "UpdateAndMarkZygoteModUnionTable" |
| 294 | : "UpdateAndMarkImageModUnionTable"; |
| 295 | DCHECK(space->IsZygoteSpace() || space->IsImageSpace()) << *space; |
| 296 | TimingLogger::ScopedTiming t(name, GetTimings()); |
| 297 | accounting::ModUnionTable* mod_union_table = heap_->FindModUnionTableFromSpace(space); |
| 298 | if (mod_union_table != nullptr) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 299 | mod_union_table->UpdateAndMarkReferences(this); |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 300 | } else { |
| 301 | // No mod-union table, scan all the live bits. This can only occur for app images. |
| 302 | space->GetLiveBitmap()->VisitMarkedRange(reinterpret_cast<uintptr_t>(space->Begin()), |
| 303 | reinterpret_cast<uintptr_t>(space->End()), |
| 304 | ScanObjectVisitor(this)); |
Mathieu Chartier | 11409ae | 2013-09-23 11:49:36 -0700 | [diff] [blame] | 305 | } |
| 306 | } |
| 307 | } |
| 308 | |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 309 | void MarkSweep::MarkReachableObjects() { |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 310 | UpdateAndMarkModUnion(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 311 | // Recursively mark all the non-image bits set in the mark bitmap. |
| 312 | RecursiveMark(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | void MarkSweep::ReclaimPhase() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 316 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 951ec2c | 2015-09-22 08:50:05 -0700 | [diff] [blame] | 317 | Thread* const self = Thread::Current(); |
Mathieu Chartier | 78f7b4c | 2014-05-06 10:57:27 -0700 | [diff] [blame] | 318 | // Process the references concurrently. |
| 319 | ProcessReferences(self); |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 320 | SweepSystemWeaks(self); |
Mathieu Chartier | 951ec2c | 2015-09-22 08:50:05 -0700 | [diff] [blame] | 321 | Runtime* const runtime = Runtime::Current(); |
| 322 | runtime->AllowNewSystemWeaks(); |
| 323 | // Clean up class loaders after system weaks are swept since that is how we know if class |
| 324 | // unloading occurred. |
| 325 | runtime->GetClassLinker()->CleanupClassLoaders(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 326 | { |
| 327 | WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
Hiroshi Yamauchi | 4460a84 | 2015-03-09 11:57:48 -0700 | [diff] [blame] | 328 | GetHeap()->RecordFreeRevoke(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 329 | // Reclaim unmarked objects. |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 330 | Sweep(false); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 331 | // Swap the live and mark bitmaps for each space which we modified space. This is an |
| 332 | // optimization that enables us to not clear live bits inside of the sweep. Only swaps unbound |
| 333 | // bitmaps. |
| 334 | SwapBitmaps(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 335 | // Unbind the live and mark bitmaps. |
Mathieu Chartier | a1602f2 | 2014-01-13 17:19:19 -0800 | [diff] [blame] | 336 | GetHeap()->UnBindBitmaps(); |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 337 | } |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 338 | } |
| 339 | |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 340 | void MarkSweep::FindDefaultSpaceBitmap() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 341 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 02e2511 | 2013-08-14 16:14:24 -0700 | [diff] [blame] | 342 | for (const auto& space : GetHeap()->GetContinuousSpaces()) { |
Mathieu Chartier | a8e8f9c | 2014-04-09 14:51:05 -0700 | [diff] [blame] | 343 | accounting::ContinuousSpaceBitmap* bitmap = space->GetMarkBitmap(); |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 344 | // We want to have the main space instead of non moving if possible. |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 345 | if (bitmap != nullptr && |
| 346 | space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) { |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 347 | current_space_bitmap_ = bitmap; |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 348 | // If we are not the non moving space exit the loop early since this will be good enough. |
| 349 | if (space != heap_->GetNonMovingSpace()) { |
| 350 | break; |
| 351 | } |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 352 | } |
| 353 | } |
Mathieu Chartier | 4c13a3f | 2014-07-14 14:57:16 -0700 | [diff] [blame] | 354 | CHECK(current_space_bitmap_ != nullptr) << "Could not find a default mark bitmap\n" |
| 355 | << heap_->DumpSpaces(); |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Mathieu Chartier | ac86a7c | 2012-11-12 15:03:16 -0800 | [diff] [blame] | 358 | void MarkSweep::ExpandMarkStack() { |
Mathieu Chartier | ba311b4 | 2013-08-27 13:02:30 -0700 | [diff] [blame] | 359 | ResizeMarkStack(mark_stack_->Capacity() * 2); |
| 360 | } |
| 361 | |
| 362 | void MarkSweep::ResizeMarkStack(size_t new_size) { |
Mathieu Chartier | ac86a7c | 2012-11-12 15:03:16 -0800 | [diff] [blame] | 363 | // Rare case, no need to have Thread::Current be a parameter. |
Mathieu Chartier | ac86a7c | 2012-11-12 15:03:16 -0800 | [diff] [blame] | 364 | if (UNLIKELY(mark_stack_->Size() < mark_stack_->Capacity())) { |
| 365 | // Someone else acquired the lock and expanded the mark stack before us. |
| 366 | return; |
| 367 | } |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 368 | std::vector<StackReference<mirror::Object>> temp(mark_stack_->Begin(), mark_stack_->End()); |
Mathieu Chartier | ba311b4 | 2013-08-27 13:02:30 -0700 | [diff] [blame] | 369 | CHECK_LE(mark_stack_->Size(), new_size); |
| 370 | mark_stack_->Resize(new_size); |
Mathieu Chartier | cb535da | 2015-01-23 13:50:03 -0800 | [diff] [blame] | 371 | for (auto& obj : temp) { |
| 372 | mark_stack_->PushBack(obj.AsMirrorPtr()); |
Mathieu Chartier | ac86a7c | 2012-11-12 15:03:16 -0800 | [diff] [blame] | 373 | } |
| 374 | } |
| 375 | |
Mathieu Chartier | e48a169 | 2015-07-15 19:58:45 -0700 | [diff] [blame] | 376 | mirror::Object* MarkSweep::MarkObject(mirror::Object* obj) { |
| 377 | MarkObject(obj, nullptr, MemberOffset(0)); |
| 378 | return obj; |
| 379 | } |
| 380 | |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 381 | inline void MarkSweep::MarkObjectNonNullParallel(mirror::Object* obj) { |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 382 | DCHECK(obj != nullptr); |
Mathieu Chartier | ac86a7c | 2012-11-12 15:03:16 -0800 | [diff] [blame] | 383 | if (MarkObjectParallel(obj)) { |
Mathieu Chartier | ba311b4 | 2013-08-27 13:02:30 -0700 | [diff] [blame] | 384 | MutexLock mu(Thread::Current(), mark_stack_lock_); |
| 385 | if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { |
Mathieu Chartier | 184e322 | 2013-08-03 14:02:57 -0700 | [diff] [blame] | 386 | ExpandMarkStack(); |
Mathieu Chartier | ac86a7c | 2012-11-12 15:03:16 -0800 | [diff] [blame] | 387 | } |
Mathieu Chartier | ba311b4 | 2013-08-27 13:02:30 -0700 | [diff] [blame] | 388 | // The object must be pushed on to the mark stack. |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 389 | mark_stack_->PushBack(obj); |
Mathieu Chartier | ac86a7c | 2012-11-12 15:03:16 -0800 | [diff] [blame] | 390 | } |
| 391 | } |
| 392 | |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 393 | bool MarkSweep::IsMarkedHeapReference(mirror::HeapReference<mirror::Object>* ref) { |
| 394 | return IsMarked(ref->AsMirrorPtr()); |
Mathieu Chartier | 308351a | 2014-06-15 12:39:02 -0700 | [diff] [blame] | 395 | } |
| 396 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 397 | class MarkSweep::MarkObjectSlowPath { |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 398 | public: |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 399 | explicit MarkObjectSlowPath(MarkSweep* mark_sweep, |
| 400 | mirror::Object* holder = nullptr, |
| 401 | MemberOffset offset = MemberOffset(0)) |
| 402 | : mark_sweep_(mark_sweep), |
| 403 | holder_(holder), |
| 404 | offset_(offset) {} |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 405 | |
Mathieu Chartier | da7c650 | 2015-07-23 16:01:26 -0700 | [diff] [blame] | 406 | void operator()(const mirror::Object* obj) const NO_THREAD_SAFETY_ANALYSIS { |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 407 | if (kProfileLargeObjects) { |
| 408 | // TODO: Differentiate between marking and testing somehow. |
| 409 | ++mark_sweep_->large_object_test_; |
| 410 | ++mark_sweep_->large_object_mark_; |
| 411 | } |
| 412 | space::LargeObjectSpace* large_object_space = mark_sweep_->GetHeap()->GetLargeObjectsSpace(); |
Mathieu Chartier | a17288e | 2014-05-08 17:53:19 -0700 | [diff] [blame] | 413 | if (UNLIKELY(obj == nullptr || !IsAligned<kPageSize>(obj) || |
Mathieu Chartier | 2dbe627 | 2014-09-16 10:43:23 -0700 | [diff] [blame] | 414 | (kIsDebugBuild && large_object_space != nullptr && |
| 415 | !large_object_space->Contains(obj)))) { |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 416 | LOG(FATAL_WITHOUT_ABORT) << "Tried to mark " << obj << " not contained by any spaces"; |
Hiroshi Yamauchi | eb2baaf | 2015-05-13 21:14:22 -0700 | [diff] [blame] | 417 | if (holder_ != nullptr) { |
Hiroshi Yamauchi | d0c8412 | 2015-05-15 15:23:30 -0700 | [diff] [blame] | 418 | size_t holder_size = holder_->SizeOf(); |
Hiroshi Yamauchi | eb2baaf | 2015-05-13 21:14:22 -0700 | [diff] [blame] | 419 | ArtField* field = holder_->FindFieldByOffset(offset_); |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 420 | LOG(FATAL_WITHOUT_ABORT) << "Field info: " |
Hiroshi Yamauchi | d0c8412 | 2015-05-15 15:23:30 -0700 | [diff] [blame] | 421 | << " holder=" << holder_ |
Hiroshi Yamauchi | 679b1cf | 2015-05-21 12:05:27 -0700 | [diff] [blame] | 422 | << " holder is " |
| 423 | << (mark_sweep_->GetHeap()->IsLiveObjectLocked(holder_) |
| 424 | ? "alive" : "dead") |
Hiroshi Yamauchi | d0c8412 | 2015-05-15 15:23:30 -0700 | [diff] [blame] | 425 | << " holder_size=" << holder_size |
Hiroshi Yamauchi | eb2baaf | 2015-05-13 21:14:22 -0700 | [diff] [blame] | 426 | << " holder_type=" << PrettyTypeOf(holder_) |
| 427 | << " offset=" << offset_.Uint32Value() |
Hiroshi Yamauchi | d0c8412 | 2015-05-15 15:23:30 -0700 | [diff] [blame] | 428 | << " field=" << (field != nullptr ? field->GetName() : "nullptr") |
| 429 | << " field_type=" |
| 430 | << (field != nullptr ? field->GetTypeDescriptor() : "") |
| 431 | << " first_ref_field_offset=" |
| 432 | << (holder_->IsClass() |
Mathieu Chartier | e401d14 | 2015-04-22 13:56:20 -0700 | [diff] [blame] | 433 | ? holder_->AsClass()->GetFirstReferenceStaticFieldOffset( |
Andreas Gampe | 542451c | 2016-07-26 09:02:02 -0700 | [diff] [blame] | 434 | kRuntimePointerSize) |
Hiroshi Yamauchi | d0c8412 | 2015-05-15 15:23:30 -0700 | [diff] [blame] | 435 | : holder_->GetClass()->GetFirstReferenceInstanceFieldOffset()) |
| 436 | << " num_of_ref_fields=" |
| 437 | << (holder_->IsClass() |
| 438 | ? holder_->AsClass()->NumReferenceStaticFields() |
Mathieu Chartier | 9826c3e | 2016-08-17 10:28:48 -0700 | [diff] [blame] | 439 | : holder_->GetClass()->NumReferenceInstanceFields()); |
Hiroshi Yamauchi | 679b1cf | 2015-05-21 12:05:27 -0700 | [diff] [blame] | 440 | // Print the memory content of the holder. |
| 441 | for (size_t i = 0; i < holder_size / sizeof(uint32_t); ++i) { |
| 442 | uint32_t* p = reinterpret_cast<uint32_t*>(holder_); |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 443 | LOG(FATAL_WITHOUT_ABORT) << &p[i] << ": " << "holder+" << (i * sizeof(uint32_t)) << " = " |
Mathieu Chartier | 5bb4b0b | 2016-08-17 22:43:52 +0000 | [diff] [blame] | 444 | << std::hex << p[i]; |
Hiroshi Yamauchi | 679b1cf | 2015-05-21 12:05:27 -0700 | [diff] [blame] | 445 | } |
Hiroshi Yamauchi | eb2baaf | 2015-05-13 21:14:22 -0700 | [diff] [blame] | 446 | } |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 447 | PrintFileToLog("/proc/self/maps", LogSeverity::FATAL_WITHOUT_ABORT); |
| 448 | MemMap::DumpMaps(LOG_STREAM(FATAL_WITHOUT_ABORT), true); |
| 449 | LOG(FATAL_WITHOUT_ABORT) << "Attempting see if it's a bad thread root"; |
Mathieu Chartier | f8a86b9 | 2016-06-14 17:08:47 -0700 | [diff] [blame] | 450 | mark_sweep_->VerifySuspendedThreadRoots(); |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 451 | LOG(FATAL) << "Can't mark invalid object"; |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | private: |
| 456 | MarkSweep* const mark_sweep_; |
Hiroshi Yamauchi | eb2baaf | 2015-05-13 21:14:22 -0700 | [diff] [blame] | 457 | mirror::Object* const holder_; |
| 458 | MemberOffset offset_; |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 459 | }; |
| 460 | |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 461 | inline void MarkSweep::MarkObjectNonNull(mirror::Object* obj, |
| 462 | mirror::Object* holder, |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 463 | MemberOffset offset) { |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 464 | DCHECK(obj != nullptr); |
Hiroshi Yamauchi | 624468c | 2014-03-31 15:14:47 -0700 | [diff] [blame] | 465 | if (kUseBakerOrBrooksReadBarrier) { |
| 466 | // Verify all the objects have the correct pointer installed. |
| 467 | obj->AssertReadBarrierPointer(); |
Hiroshi Yamauchi | 9d04a20 | 2014-01-31 13:35:49 -0800 | [diff] [blame] | 468 | } |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 469 | if (immune_spaces_.IsInImmuneRegion(obj)) { |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 470 | if (kCountMarkedObjects) { |
| 471 | ++mark_immune_count_; |
| 472 | } |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 473 | DCHECK(mark_bitmap_->Test(obj)); |
| 474 | } else if (LIKELY(current_space_bitmap_->HasAddress(obj))) { |
| 475 | if (kCountMarkedObjects) { |
| 476 | ++mark_fastpath_count_; |
| 477 | } |
| 478 | if (UNLIKELY(!current_space_bitmap_->Set(obj))) { |
| 479 | PushOnMarkStack(obj); // This object was not previously marked. |
| 480 | } |
| 481 | } else { |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 482 | if (kCountMarkedObjects) { |
| 483 | ++mark_slowpath_count_; |
| 484 | } |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 485 | MarkObjectSlowPath visitor(this, holder, offset); |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 486 | // TODO: We already know that the object is not in the current_space_bitmap_ but MarkBitmap::Set |
| 487 | // will check again. |
| 488 | if (!mark_bitmap_->Set(obj, visitor)) { |
| 489 | PushOnMarkStack(obj); // Was not already marked, push. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 490 | } |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 491 | } |
| 492 | } |
| 493 | |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 494 | inline void MarkSweep::PushOnMarkStack(mirror::Object* obj) { |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 495 | if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { |
| 496 | // Lock is not needed but is here anyways to please annotalysis. |
| 497 | MutexLock mu(Thread::Current(), mark_stack_lock_); |
| 498 | ExpandMarkStack(); |
| 499 | } |
| 500 | // The object must be pushed on to the mark stack. |
| 501 | mark_stack_->PushBack(obj); |
| 502 | } |
| 503 | |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 504 | inline bool MarkSweep::MarkObjectParallel(mirror::Object* obj) { |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 505 | DCHECK(obj != nullptr); |
Hiroshi Yamauchi | 624468c | 2014-03-31 15:14:47 -0700 | [diff] [blame] | 506 | if (kUseBakerOrBrooksReadBarrier) { |
| 507 | // Verify all the objects have the correct pointer installed. |
| 508 | obj->AssertReadBarrierPointer(); |
Hiroshi Yamauchi | 9d04a20 | 2014-01-31 13:35:49 -0800 | [diff] [blame] | 509 | } |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 510 | if (immune_spaces_.IsInImmuneRegion(obj)) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 511 | DCHECK(IsMarked(obj) != nullptr); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 512 | return false; |
| 513 | } |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 514 | // Try to take advantage of locality of references within a space, failing this find the space |
| 515 | // the hard way. |
Mathieu Chartier | a8e8f9c | 2014-04-09 14:51:05 -0700 | [diff] [blame] | 516 | accounting::ContinuousSpaceBitmap* object_bitmap = current_space_bitmap_; |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 517 | if (LIKELY(object_bitmap->HasAddress(obj))) { |
| 518 | return !object_bitmap->AtomicTestAndSet(obj); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 519 | } |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 520 | MarkObjectSlowPath visitor(this); |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 521 | return !mark_bitmap_->AtomicTestAndSet(obj, visitor); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 522 | } |
| 523 | |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 524 | void MarkSweep::MarkHeapReference(mirror::HeapReference<mirror::Object>* ref) { |
| 525 | MarkObject(ref->AsMirrorPtr(), nullptr, MemberOffset(0)); |
| 526 | } |
| 527 | |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 528 | // Used to mark objects when processing the mark stack. If an object is null, it is not marked. |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 529 | inline void MarkSweep::MarkObject(mirror::Object* obj, |
| 530 | mirror::Object* holder, |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 531 | MemberOffset offset) { |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 532 | if (obj != nullptr) { |
Hiroshi Yamauchi | eb2baaf | 2015-05-13 21:14:22 -0700 | [diff] [blame] | 533 | MarkObjectNonNull(obj, holder, offset); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 534 | } else if (kCountMarkedObjects) { |
| 535 | ++mark_null_count_; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 536 | } |
| 537 | } |
| 538 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 539 | class MarkSweep::VerifyRootMarkedVisitor : public SingleRootVisitor { |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 540 | public: |
| 541 | explicit VerifyRootMarkedVisitor(MarkSweep* collector) : collector_(collector) { } |
| 542 | |
| 543 | void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 544 | REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 545 | CHECK(collector_->IsMarked(root) != nullptr) << info.ToString(); |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | private: |
| 549 | MarkSweep* const collector_; |
| 550 | }; |
| 551 | |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 552 | void MarkSweep::VisitRoots(mirror::Object*** roots, |
| 553 | size_t count, |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 554 | const RootInfo& info ATTRIBUTE_UNUSED) { |
| 555 | for (size_t i = 0; i < count; ++i) { |
| 556 | MarkObjectNonNull(*roots[i]); |
| 557 | } |
Mathieu Chartier | ac86a7c | 2012-11-12 15:03:16 -0800 | [diff] [blame] | 558 | } |
| 559 | |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 560 | void MarkSweep::VisitRoots(mirror::CompressedReference<mirror::Object>** roots, |
| 561 | size_t count, |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 562 | const RootInfo& info ATTRIBUTE_UNUSED) { |
| 563 | for (size_t i = 0; i < count; ++i) { |
| 564 | MarkObjectNonNull(roots[i]->AsMirrorPtr()); |
| 565 | } |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 566 | } |
| 567 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 568 | class MarkSweep::VerifyRootVisitor : public SingleRootVisitor { |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 569 | public: |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 570 | void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 571 | REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
Mathieu Chartier | 9086b65 | 2015-04-14 09:35:18 -0700 | [diff] [blame] | 572 | // See if the root is on any space bitmap. |
| 573 | auto* heap = Runtime::Current()->GetHeap(); |
| 574 | if (heap->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == nullptr) { |
| 575 | space::LargeObjectSpace* large_object_space = heap->GetLargeObjectsSpace(); |
| 576 | if (large_object_space != nullptr && !large_object_space->Contains(root)) { |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 577 | LOG(FATAL_WITHOUT_ABORT) << "Found invalid root: " << root << " " << info; |
Mathieu Chartier | 9086b65 | 2015-04-14 09:35:18 -0700 | [diff] [blame] | 578 | } |
Mathieu Chartier | 6f1c949 | 2012-10-15 12:08:41 -0700 | [diff] [blame] | 579 | } |
| 580 | } |
Mathieu Chartier | 9086b65 | 2015-04-14 09:35:18 -0700 | [diff] [blame] | 581 | }; |
Mathieu Chartier | 6f1c949 | 2012-10-15 12:08:41 -0700 | [diff] [blame] | 582 | |
Mathieu Chartier | f8a86b9 | 2016-06-14 17:08:47 -0700 | [diff] [blame] | 583 | void MarkSweep::VerifySuspendedThreadRoots() { |
Mathieu Chartier | 9086b65 | 2015-04-14 09:35:18 -0700 | [diff] [blame] | 584 | VerifyRootVisitor visitor; |
Mathieu Chartier | f8a86b9 | 2016-06-14 17:08:47 -0700 | [diff] [blame] | 585 | Runtime::Current()->GetThreadList()->VisitRootsForSuspendedThreads(&visitor); |
Mathieu Chartier | 6f1c949 | 2012-10-15 12:08:41 -0700 | [diff] [blame] | 586 | } |
| 587 | |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 588 | void MarkSweep::MarkRoots(Thread* self) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 589 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 590 | if (Locks::mutator_lock_->IsExclusiveHeld(self)) { |
| 591 | // If we exclusively hold the mutator lock, all threads must be suspended. |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 592 | Runtime::Current()->VisitRoots(this); |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 593 | RevokeAllThreadLocalAllocationStacks(self); |
| 594 | } else { |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 595 | MarkRootsCheckpoint(self, kRevokeRosAllocThreadLocalBuffersAtCheckpoint); |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 596 | // At this point the live stack should no longer have any mutators which push into it. |
| 597 | MarkNonThreadRoots(); |
| 598 | MarkConcurrentRoots( |
| 599 | static_cast<VisitRootFlags>(kVisitRootFlagAllRoots | kVisitRootFlagStartLoggingNewRoots)); |
| 600 | } |
Mathieu Chartier | 9ebae1f | 2012-10-15 17:38:16 -0700 | [diff] [blame] | 601 | } |
| 602 | |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 603 | void MarkSweep::MarkNonThreadRoots() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 604 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 605 | Runtime::Current()->VisitNonThreadRoots(this); |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 606 | } |
| 607 | |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 608 | void MarkSweep::MarkConcurrentRoots(VisitRootFlags flags) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 609 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 610 | // Visit all runtime roots and clear dirty flags. |
Mathieu Chartier | 4edd847 | 2015-06-01 10:47:36 -0700 | [diff] [blame] | 611 | Runtime::Current()->VisitConcurrentRoots( |
| 612 | this, static_cast<VisitRootFlags>(flags | kVisitRootFlagNonMoving)); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 613 | } |
| 614 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 615 | class MarkSweep::DelayReferenceReferentVisitor { |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 616 | public: |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 617 | explicit DelayReferenceReferentVisitor(MarkSweep* collector) : collector_(collector) {} |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 618 | |
| 619 | void operator()(mirror::Class* klass, mirror::Reference* ref) const |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 620 | REQUIRES(Locks::heap_bitmap_lock_) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 621 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 622 | collector_->DelayReferenceReferent(klass, ref); |
| 623 | } |
| 624 | |
| 625 | private: |
| 626 | MarkSweep* const collector_; |
| 627 | }; |
| 628 | |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 629 | template <bool kUseFinger = false> |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 630 | class MarkSweep::MarkStackTask : public Task { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 631 | public: |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 632 | MarkStackTask(ThreadPool* thread_pool, |
| 633 | MarkSweep* mark_sweep, |
| 634 | size_t mark_stack_size, |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 635 | StackReference<mirror::Object>* mark_stack) |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 636 | : mark_sweep_(mark_sweep), |
| 637 | thread_pool_(thread_pool), |
| 638 | mark_stack_pos_(mark_stack_size) { |
| 639 | // We may have to copy part of an existing mark stack when another mark stack overflows. |
| 640 | if (mark_stack_size != 0) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 641 | DCHECK(mark_stack != nullptr); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 642 | // TODO: Check performance? |
| 643 | std::copy(mark_stack, mark_stack + mark_stack_size, mark_stack_); |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 644 | } |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 645 | if (kCountTasks) { |
| 646 | ++mark_sweep_->work_chunks_created_; |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | static const size_t kMaxSize = 1 * KB; |
| 651 | |
| 652 | protected: |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 653 | class MarkObjectParallelVisitor { |
| 654 | public: |
Roland Levillain | 3887c46 | 2015-08-12 18:15:42 +0100 | [diff] [blame] | 655 | ALWAYS_INLINE MarkObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task, |
| 656 | MarkSweep* mark_sweep) |
Mathieu Chartier | da7c650 | 2015-07-23 16:01:26 -0700 | [diff] [blame] | 657 | : chunk_task_(chunk_task), mark_sweep_(mark_sweep) {} |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 658 | |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 659 | ALWAYS_INLINE void operator()(mirror::Object* obj, |
| 660 | MemberOffset offset, |
| 661 | bool is_static ATTRIBUTE_UNUSED) const |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 662 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | da7c650 | 2015-07-23 16:01:26 -0700 | [diff] [blame] | 663 | Mark(obj->GetFieldObject<mirror::Object>(offset)); |
| 664 | } |
| 665 | |
| 666 | void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 667 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | da7c650 | 2015-07-23 16:01:26 -0700 | [diff] [blame] | 668 | if (!root->IsNull()) { |
| 669 | VisitRoot(root); |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 674 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | da7c650 | 2015-07-23 16:01:26 -0700 | [diff] [blame] | 675 | if (kCheckLocks) { |
| 676 | Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); |
| 677 | Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); |
| 678 | } |
| 679 | Mark(root->AsMirrorPtr()); |
| 680 | } |
| 681 | |
| 682 | private: |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 683 | ALWAYS_INLINE void Mark(mirror::Object* ref) const REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 684 | if (ref != nullptr && mark_sweep_->MarkObjectParallel(ref)) { |
| 685 | if (kUseFinger) { |
Yabin Cui | c7df66e | 2015-04-15 15:40:18 -0700 | [diff] [blame] | 686 | std::atomic_thread_fence(std::memory_order_seq_cst); |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 687 | if (reinterpret_cast<uintptr_t>(ref) >= |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 688 | static_cast<uintptr_t>(mark_sweep_->atomic_finger_.LoadRelaxed())) { |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 689 | return; |
| 690 | } |
| 691 | } |
| 692 | chunk_task_->MarkStackPush(ref); |
| 693 | } |
| 694 | } |
| 695 | |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 696 | MarkStackTask<kUseFinger>* const chunk_task_; |
| 697 | MarkSweep* const mark_sweep_; |
| 698 | }; |
| 699 | |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 700 | class ScanObjectParallelVisitor { |
| 701 | public: |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 702 | ALWAYS_INLINE explicit ScanObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task) |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 703 | : chunk_task_(chunk_task) {} |
| 704 | |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 705 | // No thread safety analysis since multiple threads will use this visitor. |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 706 | void operator()(mirror::Object* obj) const |
| 707 | REQUIRES(Locks::heap_bitmap_lock_) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 708 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 709 | MarkSweep* const mark_sweep = chunk_task_->mark_sweep_; |
| 710 | MarkObjectParallelVisitor mark_visitor(chunk_task_, mark_sweep); |
| 711 | DelayReferenceReferentVisitor ref_visitor(mark_sweep); |
| 712 | mark_sweep->ScanObjectVisit(obj, mark_visitor, ref_visitor); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | private: |
| 716 | MarkStackTask<kUseFinger>* const chunk_task_; |
| 717 | }; |
| 718 | |
| 719 | virtual ~MarkStackTask() { |
| 720 | // Make sure that we have cleared our mark stack. |
| 721 | DCHECK_EQ(mark_stack_pos_, 0U); |
| 722 | if (kCountTasks) { |
| 723 | ++mark_sweep_->work_chunks_deleted_; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | MarkSweep* const mark_sweep_; |
| 728 | ThreadPool* const thread_pool_; |
| 729 | // Thread local mark stack for this task. |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 730 | StackReference<mirror::Object> mark_stack_[kMaxSize]; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 731 | // Mark stack position. |
| 732 | size_t mark_stack_pos_; |
| 733 | |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 734 | ALWAYS_INLINE void MarkStackPush(mirror::Object* obj) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 735 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 736 | if (UNLIKELY(mark_stack_pos_ == kMaxSize)) { |
| 737 | // Mark stack overflow, give 1/2 the stack to the thread pool as a new work task. |
| 738 | mark_stack_pos_ /= 2; |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 739 | auto* task = new MarkStackTask(thread_pool_, |
| 740 | mark_sweep_, |
| 741 | kMaxSize - mark_stack_pos_, |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 742 | mark_stack_ + mark_stack_pos_); |
| 743 | thread_pool_->AddTask(Thread::Current(), task); |
| 744 | } |
| 745 | DCHECK(obj != nullptr); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 746 | DCHECK_LT(mark_stack_pos_, kMaxSize); |
Mathieu Chartier | cb535da | 2015-01-23 13:50:03 -0800 | [diff] [blame] | 747 | mark_stack_[mark_stack_pos_++].Assign(obj); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 748 | } |
| 749 | |
| 750 | virtual void Finalize() { |
| 751 | delete this; |
| 752 | } |
| 753 | |
| 754 | // Scans all of the objects |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 755 | virtual void Run(Thread* self ATTRIBUTE_UNUSED) |
| 756 | REQUIRES(Locks::heap_bitmap_lock_) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 757 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 758 | ScanObjectParallelVisitor visitor(this); |
| 759 | // TODO: Tune this. |
| 760 | static const size_t kFifoSize = 4; |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 761 | BoundedFifoPowerOfTwo<mirror::Object*, kFifoSize> prefetch_fifo; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 762 | for (;;) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 763 | mirror::Object* obj = nullptr; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 764 | if (kUseMarkStackPrefetch) { |
| 765 | while (mark_stack_pos_ != 0 && prefetch_fifo.size() < kFifoSize) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 766 | mirror::Object* const mark_stack_obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); |
Andreas Gampe | 277ccbd | 2014-11-03 21:36:10 -0800 | [diff] [blame] | 767 | DCHECK(mark_stack_obj != nullptr); |
| 768 | __builtin_prefetch(mark_stack_obj); |
| 769 | prefetch_fifo.push_back(mark_stack_obj); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 770 | } |
| 771 | if (UNLIKELY(prefetch_fifo.empty())) { |
| 772 | break; |
| 773 | } |
| 774 | obj = prefetch_fifo.front(); |
| 775 | prefetch_fifo.pop_front(); |
| 776 | } else { |
| 777 | if (UNLIKELY(mark_stack_pos_ == 0)) { |
| 778 | break; |
| 779 | } |
Mathieu Chartier | cb535da | 2015-01-23 13:50:03 -0800 | [diff] [blame] | 780 | obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 781 | } |
Mathieu Chartier | 11409ae | 2013-09-23 11:49:36 -0700 | [diff] [blame] | 782 | DCHECK(obj != nullptr); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 783 | visitor(obj); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 784 | } |
| 785 | } |
| 786 | }; |
| 787 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 788 | class MarkSweep::CardScanTask : public MarkStackTask<false> { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 789 | public: |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 790 | CardScanTask(ThreadPool* thread_pool, |
| 791 | MarkSweep* mark_sweep, |
Mathieu Chartier | a8e8f9c | 2014-04-09 14:51:05 -0700 | [diff] [blame] | 792 | accounting::ContinuousSpaceBitmap* bitmap, |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 793 | uint8_t* begin, |
| 794 | uint8_t* end, |
| 795 | uint8_t minimum_age, |
| 796 | size_t mark_stack_size, |
| 797 | StackReference<mirror::Object>* mark_stack_obj, |
| 798 | bool clear_card) |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 799 | : MarkStackTask<false>(thread_pool, mark_sweep, mark_stack_size, mark_stack_obj), |
| 800 | bitmap_(bitmap), |
| 801 | begin_(begin), |
| 802 | end_(end), |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 803 | minimum_age_(minimum_age), |
| 804 | clear_card_(clear_card) {} |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 805 | |
| 806 | protected: |
Mathieu Chartier | a8e8f9c | 2014-04-09 14:51:05 -0700 | [diff] [blame] | 807 | accounting::ContinuousSpaceBitmap* const bitmap_; |
Ian Rogers | 1373595 | 2014-10-08 12:43:28 -0700 | [diff] [blame] | 808 | uint8_t* const begin_; |
| 809 | uint8_t* const end_; |
| 810 | const uint8_t minimum_age_; |
Lei Li | 727b294 | 2015-01-15 11:26:34 +0800 | [diff] [blame] | 811 | const bool clear_card_; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 812 | |
| 813 | virtual void Finalize() { |
| 814 | delete this; |
| 815 | } |
| 816 | |
| 817 | virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { |
| 818 | ScanObjectParallelVisitor visitor(this); |
| 819 | accounting::CardTable* card_table = mark_sweep_->GetHeap()->GetCardTable(); |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 820 | size_t cards_scanned = clear_card_ |
| 821 | ? card_table->Scan<true>(bitmap_, begin_, end_, visitor, minimum_age_) |
| 822 | : card_table->Scan<false>(bitmap_, begin_, end_, visitor, minimum_age_); |
Mathieu Chartier | 0f72e41 | 2013-09-06 16:40:01 -0700 | [diff] [blame] | 823 | VLOG(heap) << "Parallel scanning cards " << reinterpret_cast<void*>(begin_) << " - " |
| 824 | << reinterpret_cast<void*>(end_) << " = " << cards_scanned; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 825 | // Finish by emptying our local mark stack. |
| 826 | MarkStackTask::Run(self); |
| 827 | } |
| 828 | }; |
| 829 | |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 830 | size_t MarkSweep::GetThreadCount(bool paused) const { |
Mathieu Chartier | f8cb178 | 2016-03-18 18:45:41 -0700 | [diff] [blame] | 831 | // Use less threads if we are in a background state (non jank perceptible) since we want to leave |
| 832 | // more CPU time for the foreground apps. |
| 833 | if (heap_->GetThreadPool() == nullptr || !Runtime::Current()->InJankPerceptibleProcessState()) { |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 834 | return 1; |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 835 | } |
Mathieu Chartier | 10d6886 | 2015-04-15 14:21:33 -0700 | [diff] [blame] | 836 | return (paused ? heap_->GetParallelGCThreadCount() : heap_->GetConcGCThreadCount()) + 1; |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 837 | } |
| 838 | |
Ian Rogers | 1373595 | 2014-10-08 12:43:28 -0700 | [diff] [blame] | 839 | void MarkSweep::ScanGrayObjects(bool paused, uint8_t minimum_age) { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 840 | accounting::CardTable* card_table = GetHeap()->GetCardTable(); |
| 841 | ThreadPool* thread_pool = GetHeap()->GetThreadPool(); |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 842 | size_t thread_count = GetThreadCount(paused); |
| 843 | // The parallel version with only one thread is faster for card scanning, TODO: fix. |
Mathieu Chartier | bbd695c | 2014-04-16 09:48:48 -0700 | [diff] [blame] | 844 | if (kParallelCardScan && thread_count > 1) { |
Mathieu Chartier | 720ef76 | 2013-08-17 14:46:54 -0700 | [diff] [blame] | 845 | Thread* self = Thread::Current(); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 846 | // Can't have a different split for each space since multiple spaces can have their cards being |
| 847 | // scanned at the same time. |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 848 | TimingLogger::ScopedTiming t(paused ? "(Paused)ScanGrayObjects" : __FUNCTION__, |
| 849 | GetTimings()); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 850 | // Try to take some of the mark stack since we can pass this off to the worker tasks. |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 851 | StackReference<mirror::Object>* mark_stack_begin = mark_stack_->Begin(); |
| 852 | StackReference<mirror::Object>* mark_stack_end = mark_stack_->End(); |
Mathieu Chartier | 720ef76 | 2013-08-17 14:46:54 -0700 | [diff] [blame] | 853 | const size_t mark_stack_size = mark_stack_end - mark_stack_begin; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 854 | // Estimated number of work tasks we will create. |
| 855 | const size_t mark_stack_tasks = GetHeap()->GetContinuousSpaces().size() * thread_count; |
| 856 | DCHECK_NE(mark_stack_tasks, 0U); |
| 857 | const size_t mark_stack_delta = std::min(CardScanTask::kMaxSize / 2, |
| 858 | mark_stack_size / mark_stack_tasks + 1); |
| 859 | for (const auto& space : GetHeap()->GetContinuousSpaces()) { |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 860 | if (space->GetMarkBitmap() == nullptr) { |
| 861 | continue; |
| 862 | } |
Ian Rogers | 1373595 | 2014-10-08 12:43:28 -0700 | [diff] [blame] | 863 | uint8_t* card_begin = space->Begin(); |
| 864 | uint8_t* card_end = space->End(); |
Hiroshi Yamauchi | 0941b04 | 2013-11-05 11:34:03 -0800 | [diff] [blame] | 865 | // Align up the end address. For example, the image space's end |
| 866 | // may not be card-size-aligned. |
| 867 | card_end = AlignUp(card_end, accounting::CardTable::kCardSize); |
Roland Levillain | 14d9057 | 2015-07-16 10:52:26 +0100 | [diff] [blame] | 868 | DCHECK_ALIGNED(card_begin, accounting::CardTable::kCardSize); |
| 869 | DCHECK_ALIGNED(card_end, accounting::CardTable::kCardSize); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 870 | // Calculate how many bytes of heap we will scan, |
| 871 | const size_t address_range = card_end - card_begin; |
| 872 | // Calculate how much address range each task gets. |
| 873 | const size_t card_delta = RoundUp(address_range / thread_count + 1, |
| 874 | accounting::CardTable::kCardSize); |
Lei Li | 727b294 | 2015-01-15 11:26:34 +0800 | [diff] [blame] | 875 | // If paused and the space is neither zygote nor image space, we could clear the dirty |
| 876 | // cards to avoid accumulating them to increase card scanning load in the following GC |
| 877 | // cycles. We need to keep dirty cards of image space and zygote space in order to track |
| 878 | // references to the other spaces. |
| 879 | bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 880 | // Create the worker tasks for this space. |
| 881 | while (card_begin != card_end) { |
| 882 | // Add a range of cards. |
| 883 | size_t addr_remaining = card_end - card_begin; |
| 884 | size_t card_increment = std::min(card_delta, addr_remaining); |
| 885 | // Take from the back of the mark stack. |
| 886 | size_t mark_stack_remaining = mark_stack_end - mark_stack_begin; |
| 887 | size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining); |
| 888 | mark_stack_end -= mark_stack_increment; |
| 889 | mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment)); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 890 | DCHECK_EQ(mark_stack_end, mark_stack_->End()); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 891 | // Add the new task to the thread pool. |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 892 | auto* task = new CardScanTask(thread_pool, |
| 893 | this, |
| 894 | space->GetMarkBitmap(), |
| 895 | card_begin, |
| 896 | card_begin + card_increment, |
| 897 | minimum_age, |
| 898 | mark_stack_increment, |
| 899 | mark_stack_end, |
| 900 | clear_card); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 901 | thread_pool->AddTask(self, task); |
| 902 | card_begin += card_increment; |
| 903 | } |
| 904 | } |
Mathieu Chartier | 0f72e41 | 2013-09-06 16:40:01 -0700 | [diff] [blame] | 905 | |
Hiroshi Yamauchi | 0941b04 | 2013-11-05 11:34:03 -0800 | [diff] [blame] | 906 | // Note: the card scan below may dirty new cards (and scan them) |
| 907 | // as a side effect when a Reference object is encountered and |
| 908 | // queued during the marking. See b/11465268. |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 909 | thread_pool->SetMaxActiveWorkers(thread_count - 1); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 910 | thread_pool->StartWorkers(self); |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 911 | thread_pool->Wait(self, true, true); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 912 | thread_pool->StopWorkers(self); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 913 | } else { |
| 914 | for (const auto& space : GetHeap()->GetContinuousSpaces()) { |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 915 | if (space->GetMarkBitmap() != nullptr) { |
| 916 | // Image spaces are handled properly since live == marked for them. |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 917 | const char* name = nullptr; |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 918 | switch (space->GetGcRetentionPolicy()) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 919 | case space::kGcRetentionPolicyNeverCollect: |
| 920 | name = paused ? "(Paused)ScanGrayImageSpaceObjects" : "ScanGrayImageSpaceObjects"; |
| 921 | break; |
| 922 | case space::kGcRetentionPolicyFullCollect: |
| 923 | name = paused ? "(Paused)ScanGrayZygoteSpaceObjects" : "ScanGrayZygoteSpaceObjects"; |
| 924 | break; |
| 925 | case space::kGcRetentionPolicyAlwaysCollect: |
| 926 | name = paused ? "(Paused)ScanGrayAllocSpaceObjects" : "ScanGrayAllocSpaceObjects"; |
| 927 | break; |
| 928 | default: |
| 929 | LOG(FATAL) << "Unreachable"; |
Ian Rogers | 2c4257b | 2014-10-24 14:20:06 -0700 | [diff] [blame] | 930 | UNREACHABLE(); |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 931 | } |
| 932 | TimingLogger::ScopedTiming t(name, GetTimings()); |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 933 | ScanObjectVisitor visitor(this); |
Lei Li | 727b294 | 2015-01-15 11:26:34 +0800 | [diff] [blame] | 934 | bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); |
| 935 | if (clear_card) { |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 936 | card_table->Scan<true>(space->GetMarkBitmap(), |
| 937 | space->Begin(), |
| 938 | space->End(), |
| 939 | visitor, |
Lei Li | 727b294 | 2015-01-15 11:26:34 +0800 | [diff] [blame] | 940 | minimum_age); |
| 941 | } else { |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 942 | card_table->Scan<false>(space->GetMarkBitmap(), |
| 943 | space->Begin(), |
| 944 | space->End(), |
| 945 | visitor, |
Lei Li | 727b294 | 2015-01-15 11:26:34 +0800 | [diff] [blame] | 946 | minimum_age); |
| 947 | } |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 948 | } |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 949 | } |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 950 | } |
| 951 | } |
| 952 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 953 | class MarkSweep::RecursiveMarkTask : public MarkStackTask<false> { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 954 | public: |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 955 | RecursiveMarkTask(ThreadPool* thread_pool, |
| 956 | MarkSweep* mark_sweep, |
| 957 | accounting::ContinuousSpaceBitmap* bitmap, |
| 958 | uintptr_t begin, |
| 959 | uintptr_t end) |
| 960 | : MarkStackTask<false>(thread_pool, mark_sweep, 0, nullptr), |
| 961 | bitmap_(bitmap), |
| 962 | begin_(begin), |
| 963 | end_(end) {} |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 964 | |
| 965 | protected: |
Mathieu Chartier | a8e8f9c | 2014-04-09 14:51:05 -0700 | [diff] [blame] | 966 | accounting::ContinuousSpaceBitmap* const bitmap_; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 967 | const uintptr_t begin_; |
| 968 | const uintptr_t end_; |
| 969 | |
| 970 | virtual void Finalize() { |
| 971 | delete this; |
| 972 | } |
| 973 | |
| 974 | // Scans all of the objects |
| 975 | virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { |
| 976 | ScanObjectParallelVisitor visitor(this); |
| 977 | bitmap_->VisitMarkedRange(begin_, end_, visitor); |
| 978 | // Finish by emptying our local mark stack. |
| 979 | MarkStackTask::Run(self); |
| 980 | } |
| 981 | }; |
| 982 | |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 983 | // Populates the mark stack based on the set of marked objects and |
| 984 | // recursively marks until the mark stack is emptied. |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 985 | void MarkSweep::RecursiveMark() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 986 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | a1602f2 | 2014-01-13 17:19:19 -0800 | [diff] [blame] | 987 | // RecursiveMark will build the lists of known instances of the Reference classes. See |
| 988 | // DelayReferenceReferent for details. |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 989 | if (kUseRecursiveMark) { |
| 990 | const bool partial = GetGcType() == kGcTypePartial; |
| 991 | ScanObjectVisitor scan_visitor(this); |
| 992 | auto* self = Thread::Current(); |
| 993 | ThreadPool* thread_pool = heap_->GetThreadPool(); |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 994 | size_t thread_count = GetThreadCount(false); |
| 995 | const bool parallel = kParallelRecursiveMark && thread_count > 1; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 996 | mark_stack_->Reset(); |
Mathieu Chartier | 02e2511 | 2013-08-14 16:14:24 -0700 | [diff] [blame] | 997 | for (const auto& space : GetHeap()->GetContinuousSpaces()) { |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 998 | if ((space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) || |
| 999 | (!partial && space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) { |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 1000 | current_space_bitmap_ = space->GetMarkBitmap(); |
| 1001 | if (current_space_bitmap_ == nullptr) { |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 1002 | continue; |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 1003 | } |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1004 | if (parallel) { |
| 1005 | // We will use the mark stack the future. |
| 1006 | // CHECK(mark_stack_->IsEmpty()); |
| 1007 | // This function does not handle heap end increasing, so we must use the space end. |
| 1008 | uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); |
| 1009 | uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 1010 | atomic_finger_.StoreRelaxed(AtomicInteger::MaxValue()); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1011 | |
| 1012 | // Create a few worker tasks. |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 1013 | const size_t n = thread_count * 2; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1014 | while (begin != end) { |
| 1015 | uintptr_t start = begin; |
| 1016 | uintptr_t delta = (end - begin) / n; |
| 1017 | delta = RoundUp(delta, KB); |
| 1018 | if (delta < 16 * KB) delta = end - begin; |
| 1019 | begin += delta; |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 1020 | auto* task = new RecursiveMarkTask(thread_pool, |
| 1021 | this, |
| 1022 | current_space_bitmap_, |
| 1023 | start, |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1024 | begin); |
| 1025 | thread_pool->AddTask(self, task); |
| 1026 | } |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 1027 | thread_pool->SetMaxActiveWorkers(thread_count - 1); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1028 | thread_pool->StartWorkers(self); |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 1029 | thread_pool->Wait(self, true, true); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1030 | thread_pool->StopWorkers(self); |
| 1031 | } else { |
| 1032 | // This function does not handle heap end increasing, so we must use the space end. |
| 1033 | uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); |
| 1034 | uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 1035 | current_space_bitmap_->VisitMarkedRange(begin, end, scan_visitor); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1036 | } |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 1037 | } |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 1038 | } |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 1039 | } |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1040 | ProcessMarkStack(false); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 1041 | } |
| 1042 | |
Ian Rogers | 1373595 | 2014-10-08 12:43:28 -0700 | [diff] [blame] | 1043 | void MarkSweep::RecursiveMarkDirtyObjects(bool paused, uint8_t minimum_age) { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1044 | ScanGrayObjects(paused, minimum_age); |
| 1045 | ProcessMarkStack(paused); |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 1046 | } |
| 1047 | |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 1048 | void MarkSweep::ReMarkRoots() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1049 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 1050 | Locks::mutator_lock_->AssertExclusiveHeld(Thread::Current()); |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 1051 | Runtime::Current()->VisitRoots(this, static_cast<VisitRootFlags>( |
| 1052 | kVisitRootFlagNewRoots | kVisitRootFlagStopLoggingNewRoots | kVisitRootFlagClearRootLog)); |
Mathieu Chartier | 7bf9f19 | 2014-04-04 11:09:41 -0700 | [diff] [blame] | 1053 | if (kVerifyRootsMarked) { |
Andreas Gampe | 277ccbd | 2014-11-03 21:36:10 -0800 | [diff] [blame] | 1054 | TimingLogger::ScopedTiming t2("(Paused)VerifyRoots", GetTimings()); |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 1055 | VerifyRootMarkedVisitor visitor(this); |
| 1056 | Runtime::Current()->VisitRoots(&visitor); |
Mathieu Chartier | 893263b | 2014-03-04 11:07:42 -0800 | [diff] [blame] | 1057 | } |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 1058 | } |
| 1059 | |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 1060 | void MarkSweep::SweepSystemWeaks(Thread* self) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1061 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 14c3bf9 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1062 | ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1063 | Runtime::Current()->SweepSystemWeaks(this); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 1064 | } |
| 1065 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 1066 | class MarkSweep::VerifySystemWeakVisitor : public IsMarkedVisitor { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1067 | public: |
| 1068 | explicit VerifySystemWeakVisitor(MarkSweep* mark_sweep) : mark_sweep_(mark_sweep) {} |
Mathieu Chartier | c7b83a0 | 2012-09-11 18:07:39 -0700 | [diff] [blame] | 1069 | |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 1070 | virtual mirror::Object* IsMarked(mirror::Object* obj) |
| 1071 | OVERRIDE |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 1072 | REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1073 | mark_sweep_->VerifyIsLive(obj); |
| 1074 | return obj; |
| 1075 | } |
| 1076 | |
| 1077 | MarkSweep* const mark_sweep_; |
| 1078 | }; |
| 1079 | |
| 1080 | void MarkSweep::VerifyIsLive(const mirror::Object* obj) { |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 1081 | if (!heap_->GetLiveBitmap()->Test(obj)) { |
Mathieu Chartier | cb535da | 2015-01-23 13:50:03 -0800 | [diff] [blame] | 1082 | // TODO: Consider live stack? Has this code bitrotted? |
| 1083 | CHECK(!heap_->allocation_stack_->Contains(obj)) |
| 1084 | << "Found dead object " << obj << "\n" << heap_->DumpSpaces(); |
Mathieu Chartier | c7b83a0 | 2012-09-11 18:07:39 -0700 | [diff] [blame] | 1085 | } |
| 1086 | } |
| 1087 | |
| 1088 | void MarkSweep::VerifySystemWeaks() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1089 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 6aa3df9 | 2013-09-17 15:17:28 -0700 | [diff] [blame] | 1090 | // Verify system weaks, uses a special object visitor which returns the input object. |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1091 | VerifySystemWeakVisitor visitor(this); |
| 1092 | Runtime::Current()->SweepSystemWeaks(&visitor); |
Mathieu Chartier | c7b83a0 | 2012-09-11 18:07:39 -0700 | [diff] [blame] | 1093 | } |
| 1094 | |
Mathieu Chartier | a07f559 | 2016-06-16 11:44:28 -0700 | [diff] [blame] | 1095 | class MarkSweep::CheckpointMarkThreadRoots : public Closure, public RootVisitor { |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 1096 | public: |
Roland Levillain | 3887c46 | 2015-08-12 18:15:42 +0100 | [diff] [blame] | 1097 | CheckpointMarkThreadRoots(MarkSweep* mark_sweep, |
| 1098 | bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 1099 | : mark_sweep_(mark_sweep), |
| 1100 | revoke_ros_alloc_thread_local_buffers_at_checkpoint_( |
| 1101 | revoke_ros_alloc_thread_local_buffers_at_checkpoint) { |
| 1102 | } |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 1103 | |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 1104 | void VisitRoots(mirror::Object*** roots, size_t count, const RootInfo& info ATTRIBUTE_UNUSED) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 1105 | OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_) |
Mathieu Chartier | 9044347 | 2015-07-16 20:32:27 -0700 | [diff] [blame] | 1106 | REQUIRES(Locks::heap_bitmap_lock_) { |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 1107 | for (size_t i = 0; i < count; ++i) { |
| 1108 | mark_sweep_->MarkObjectNonNullParallel(*roots[i]); |
| 1109 | } |
| 1110 | } |
| 1111 | |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 1112 | void VisitRoots(mirror::CompressedReference<mirror::Object>** roots, |
| 1113 | size_t count, |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 1114 | const RootInfo& info ATTRIBUTE_UNUSED) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 1115 | OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_) |
Mathieu Chartier | 9044347 | 2015-07-16 20:32:27 -0700 | [diff] [blame] | 1116 | REQUIRES(Locks::heap_bitmap_lock_) { |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 1117 | for (size_t i = 0; i < count; ++i) { |
| 1118 | mark_sweep_->MarkObjectNonNullParallel(roots[i]->AsMirrorPtr()); |
| 1119 | } |
| 1120 | } |
| 1121 | |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 1122 | virtual void Run(Thread* thread) OVERRIDE NO_THREAD_SAFETY_ANALYSIS { |
Mathieu Chartier | 32ce2ad | 2016-03-04 14:58:03 -0800 | [diff] [blame] | 1123 | ScopedTrace trace("Marking thread roots"); |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 1124 | // Note: self is not necessarily equal to thread since thread may be suspended. |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 1125 | Thread* const self = Thread::Current(); |
Mathieu Chartier | d22d548 | 2012-11-06 17:14:12 -0800 | [diff] [blame] | 1126 | CHECK(thread == self || thread->IsSuspended() || thread->GetState() == kWaitingPerformingGc) |
| 1127 | << thread->GetState() << " thread " << thread << " self " << self; |
Mathieu Chartier | bb87e0f | 2015-04-03 11:21:55 -0700 | [diff] [blame] | 1128 | thread->VisitRoots(this); |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 1129 | if (revoke_ros_alloc_thread_local_buffers_at_checkpoint_) { |
Mathieu Chartier | 32ce2ad | 2016-03-04 14:58:03 -0800 | [diff] [blame] | 1130 | ScopedTrace trace2("RevokeRosAllocThreadLocalBuffers"); |
Hiroshi Yamauchi | c93c530 | 2014-03-20 16:15:37 -0700 | [diff] [blame] | 1131 | mark_sweep_->GetHeap()->RevokeRosAllocThreadLocalBuffers(thread); |
| 1132 | } |
Lei Li | dd9943d | 2015-02-02 14:24:44 +0800 | [diff] [blame] | 1133 | // If thread is a running mutator, then act on behalf of the garbage collector. |
| 1134 | // See the code in ThreadList::RunCheckpoint. |
Mathieu Chartier | 10d2508 | 2015-10-28 18:36:09 -0700 | [diff] [blame] | 1135 | mark_sweep_->GetBarrier().Pass(self); |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 1136 | } |
| 1137 | |
| 1138 | private: |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 1139 | MarkSweep* const mark_sweep_; |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 1140 | const bool revoke_ros_alloc_thread_local_buffers_at_checkpoint_; |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 1141 | }; |
| 1142 | |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 1143 | void MarkSweep::MarkRootsCheckpoint(Thread* self, |
| 1144 | bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1145 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 1146 | CheckpointMarkThreadRoots check_point(this, revoke_ros_alloc_thread_local_buffers_at_checkpoint); |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 1147 | ThreadList* thread_list = Runtime::Current()->GetThreadList(); |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 1148 | // Request the check point is run on all threads returning a count of the threads that must |
| 1149 | // run through the barrier including self. |
| 1150 | size_t barrier_count = thread_list->RunCheckpoint(&check_point); |
| 1151 | // Release locks then wait for all mutator threads to pass the barrier. |
Lei Li | dd9943d | 2015-02-02 14:24:44 +0800 | [diff] [blame] | 1152 | // If there are no threads to wait which implys that all the checkpoint functions are finished, |
| 1153 | // then no need to release locks. |
| 1154 | if (barrier_count == 0) { |
| 1155 | return; |
| 1156 | } |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 1157 | Locks::heap_bitmap_lock_->ExclusiveUnlock(self); |
| 1158 | Locks::mutator_lock_->SharedUnlock(self); |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 1159 | { |
| 1160 | ScopedThreadStateChange tsc(self, kWaitingForCheckPointsToRun); |
| 1161 | gc_barrier_->Increment(self, barrier_count); |
| 1162 | } |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 1163 | Locks::mutator_lock_->SharedLock(self); |
| 1164 | Locks::heap_bitmap_lock_->ExclusiveLock(self); |
Mathieu Chartier | 858f1c5 | 2012-10-17 17:45:55 -0700 | [diff] [blame] | 1165 | } |
| 1166 | |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 1167 | void MarkSweep::SweepArray(accounting::ObjectStack* allocations, bool swap_bitmaps) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1168 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1169 | Thread* self = Thread::Current(); |
Hiroshi Yamauchi | bbdc5bc | 2014-05-28 14:04:59 -0700 | [diff] [blame] | 1170 | mirror::Object** chunk_free_buffer = reinterpret_cast<mirror::Object**>( |
| 1171 | sweep_array_free_buffer_mem_map_->BaseBegin()); |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1172 | size_t chunk_free_pos = 0; |
Mathieu Chartier | 10fb83a | 2014-06-15 15:15:43 -0700 | [diff] [blame] | 1173 | ObjectBytePair freed; |
| 1174 | ObjectBytePair freed_los; |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1175 | // How many objects are left in the array, modified after each space is swept. |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1176 | StackReference<mirror::Object>* objects = allocations->Begin(); |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1177 | size_t count = allocations->Size(); |
| 1178 | // Change the order to ensure that the non-moving space last swept as an optimization. |
| 1179 | std::vector<space::ContinuousSpace*> sweep_spaces; |
| 1180 | space::ContinuousSpace* non_moving_space = nullptr; |
| 1181 | for (space::ContinuousSpace* space : heap_->GetContinuousSpaces()) { |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 1182 | if (space->IsAllocSpace() && |
| 1183 | !immune_spaces_.ContainsSpace(space) && |
Mathieu Chartier | 8d56210 | 2014-03-12 17:42:10 -0700 | [diff] [blame] | 1184 | space->GetLiveBitmap() != nullptr) { |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1185 | if (space == heap_->GetNonMovingSpace()) { |
| 1186 | non_moving_space = space; |
| 1187 | } else { |
| 1188 | sweep_spaces.push_back(space); |
| 1189 | } |
| 1190 | } |
| 1191 | } |
| 1192 | // Unlikely to sweep a significant amount of non_movable objects, so we do these after the after |
| 1193 | // the other alloc spaces as an optimization. |
| 1194 | if (non_moving_space != nullptr) { |
| 1195 | sweep_spaces.push_back(non_moving_space); |
| 1196 | } |
| 1197 | // Start by sweeping the continuous spaces. |
| 1198 | for (space::ContinuousSpace* space : sweep_spaces) { |
| 1199 | space::AllocSpace* alloc_space = space->AsAllocSpace(); |
Mathieu Chartier | a8e8f9c | 2014-04-09 14:51:05 -0700 | [diff] [blame] | 1200 | accounting::ContinuousSpaceBitmap* live_bitmap = space->GetLiveBitmap(); |
| 1201 | accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1202 | if (swap_bitmaps) { |
| 1203 | std::swap(live_bitmap, mark_bitmap); |
| 1204 | } |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1205 | StackReference<mirror::Object>* out = objects; |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1206 | for (size_t i = 0; i < count; ++i) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1207 | mirror::Object* const obj = objects[i].AsMirrorPtr(); |
Hiroshi Yamauchi | f5b0e20 | 2014-02-11 17:02:22 -0800 | [diff] [blame] | 1208 | if (kUseThreadLocalAllocationStack && obj == nullptr) { |
| 1209 | continue; |
| 1210 | } |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1211 | if (space->HasAddress(obj)) { |
| 1212 | // This object is in the space, remove it from the array and add it to the sweep buffer |
| 1213 | // if needed. |
| 1214 | if (!mark_bitmap->Test(obj)) { |
| 1215 | if (chunk_free_pos >= kSweepArrayChunkFreeSize) { |
Andreas Gampe | 277ccbd | 2014-11-03 21:36:10 -0800 | [diff] [blame] | 1216 | TimingLogger::ScopedTiming t2("FreeList", GetTimings()); |
Mathieu Chartier | 10fb83a | 2014-06-15 15:15:43 -0700 | [diff] [blame] | 1217 | freed.objects += chunk_free_pos; |
| 1218 | freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1219 | chunk_free_pos = 0; |
| 1220 | } |
| 1221 | chunk_free_buffer[chunk_free_pos++] = obj; |
| 1222 | } |
| 1223 | } else { |
Mathieu Chartier | cb535da | 2015-01-23 13:50:03 -0800 | [diff] [blame] | 1224 | (out++)->Assign(obj); |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1225 | } |
| 1226 | } |
| 1227 | if (chunk_free_pos > 0) { |
Andreas Gampe | 277ccbd | 2014-11-03 21:36:10 -0800 | [diff] [blame] | 1228 | TimingLogger::ScopedTiming t2("FreeList", GetTimings()); |
Mathieu Chartier | 10fb83a | 2014-06-15 15:15:43 -0700 | [diff] [blame] | 1229 | freed.objects += chunk_free_pos; |
| 1230 | freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); |
Mathieu Chartier | e6da9af | 2013-12-16 11:54:42 -0800 | [diff] [blame] | 1231 | chunk_free_pos = 0; |
| 1232 | } |
| 1233 | // All of the references which space contained are no longer in the allocation stack, update |
| 1234 | // the count. |
| 1235 | count = out - objects; |
| 1236 | } |
| 1237 | // Handle the large object space. |
| 1238 | space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); |
Mathieu Chartier | 2dbe627 | 2014-09-16 10:43:23 -0700 | [diff] [blame] | 1239 | if (large_object_space != nullptr) { |
| 1240 | accounting::LargeObjectBitmap* large_live_objects = large_object_space->GetLiveBitmap(); |
| 1241 | accounting::LargeObjectBitmap* large_mark_objects = large_object_space->GetMarkBitmap(); |
| 1242 | if (swap_bitmaps) { |
| 1243 | std::swap(large_live_objects, large_mark_objects); |
Hiroshi Yamauchi | f5b0e20 | 2014-02-11 17:02:22 -0800 | [diff] [blame] | 1244 | } |
Mathieu Chartier | 2dbe627 | 2014-09-16 10:43:23 -0700 | [diff] [blame] | 1245 | for (size_t i = 0; i < count; ++i) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1246 | mirror::Object* const obj = objects[i].AsMirrorPtr(); |
Mathieu Chartier | 2dbe627 | 2014-09-16 10:43:23 -0700 | [diff] [blame] | 1247 | // Handle large objects. |
| 1248 | if (kUseThreadLocalAllocationStack && obj == nullptr) { |
| 1249 | continue; |
| 1250 | } |
| 1251 | if (!large_mark_objects->Test(obj)) { |
| 1252 | ++freed_los.objects; |
| 1253 | freed_los.bytes += large_object_space->Free(self, obj); |
| 1254 | } |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 1255 | } |
| 1256 | } |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1257 | { |
Andreas Gampe | 277ccbd | 2014-11-03 21:36:10 -0800 | [diff] [blame] | 1258 | TimingLogger::ScopedTiming t2("RecordFree", GetTimings()); |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1259 | RecordFree(freed); |
| 1260 | RecordFreeLOS(freed_los); |
Andreas Gampe | 277ccbd | 2014-11-03 21:36:10 -0800 | [diff] [blame] | 1261 | t2.NewTiming("ResetStack"); |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1262 | allocations->Reset(); |
| 1263 | } |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 1264 | sweep_array_free_buffer_mem_map_->MadviseDontNeedAndZero(); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 1265 | } |
| 1266 | |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 1267 | void MarkSweep::Sweep(bool swap_bitmaps) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1268 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | 0f7bf6a | 2014-03-28 10:05:39 -0700 | [diff] [blame] | 1269 | // Ensure that nobody inserted items in the live stack after we swapped the stacks. |
| 1270 | CHECK_GE(live_stack_freeze_size_, GetHeap()->GetLiveStack()->Size()); |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1271 | { |
| 1272 | TimingLogger::ScopedTiming t2("MarkAllocStackAsLive", GetTimings()); |
| 1273 | // Mark everything allocated since the last as GC live so that we can sweep concurrently, |
| 1274 | // knowing that new allocations won't be marked as live. |
| 1275 | accounting::ObjectStack* live_stack = heap_->GetLiveStack(); |
| 1276 | heap_->MarkAllocStackAsLive(live_stack); |
| 1277 | live_stack->Reset(); |
| 1278 | DCHECK(mark_stack_->IsEmpty()); |
| 1279 | } |
Mathieu Chartier | 02e2511 | 2013-08-14 16:14:24 -0700 | [diff] [blame] | 1280 | for (const auto& space : GetHeap()->GetContinuousSpaces()) { |
Mathieu Chartier | a1602f2 | 2014-01-13 17:19:19 -0800 | [diff] [blame] | 1281 | if (space->IsContinuousMemMapAllocSpace()) { |
| 1282 | space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1283 | TimingLogger::ScopedTiming split( |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 1284 | alloc_space->IsZygoteSpace() ? "SweepZygoteSpace" : "SweepMallocSpace", |
| 1285 | GetTimings()); |
Mathieu Chartier | 10fb83a | 2014-06-15 15:15:43 -0700 | [diff] [blame] | 1286 | RecordFree(alloc_space->Sweep(swap_bitmaps)); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 1287 | } |
| 1288 | } |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 1289 | SweepLargeObjects(swap_bitmaps); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 1290 | } |
| 1291 | |
Mathieu Chartier | e0f0cb3 | 2012-08-28 11:26:00 -0700 | [diff] [blame] | 1292 | void MarkSweep::SweepLargeObjects(bool swap_bitmaps) { |
Mathieu Chartier | 2dbe627 | 2014-09-16 10:43:23 -0700 | [diff] [blame] | 1293 | space::LargeObjectSpace* los = heap_->GetLargeObjectsSpace(); |
| 1294 | if (los != nullptr) { |
| 1295 | TimingLogger::ScopedTiming split(__FUNCTION__, GetTimings()); |
| 1296 | RecordFreeLOS(los->Sweep(swap_bitmaps)); |
| 1297 | } |
Mathieu Chartier | e0f0cb3 | 2012-08-28 11:26:00 -0700 | [diff] [blame] | 1298 | } |
| 1299 | |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 1300 | // Process the "referent" field in a java.lang.ref.Reference. If the referent has not yet been |
| 1301 | // marked, put it on the appropriate list in the heap for later processing. |
| 1302 | void MarkSweep::DelayReferenceReferent(mirror::Class* klass, mirror::Reference* ref) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1303 | heap_->GetReferenceProcessor()->DelayReferenceReferent(klass, ref, this); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 1304 | } |
| 1305 | |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1306 | class MarkVisitor { |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1307 | public: |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 1308 | ALWAYS_INLINE explicit MarkVisitor(MarkSweep* const mark_sweep) : mark_sweep_(mark_sweep) {} |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1309 | |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 1310 | ALWAYS_INLINE void operator()(mirror::Object* obj, |
| 1311 | MemberOffset offset, |
| 1312 | bool is_static ATTRIBUTE_UNUSED) const |
| 1313 | REQUIRES(Locks::heap_bitmap_lock_) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 1314 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1315 | if (kCheckLocks) { |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 1316 | Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); |
| 1317 | Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); |
| 1318 | } |
Hiroshi Yamauchi | eb2baaf | 2015-05-13 21:14:22 -0700 | [diff] [blame] | 1319 | mark_sweep_->MarkObject(obj->GetFieldObject<mirror::Object>(offset), obj, offset); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1320 | } |
| 1321 | |
Mathieu Chartier | da7c650 | 2015-07-23 16:01:26 -0700 | [diff] [blame] | 1322 | void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 1323 | REQUIRES(Locks::heap_bitmap_lock_) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 1324 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | da7c650 | 2015-07-23 16:01:26 -0700 | [diff] [blame] | 1325 | if (!root->IsNull()) { |
| 1326 | VisitRoot(root); |
| 1327 | } |
| 1328 | } |
| 1329 | |
| 1330 | void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const |
Mathieu Chartier | 1ac1c2b | 2015-09-22 14:53:32 -0700 | [diff] [blame] | 1331 | REQUIRES(Locks::heap_bitmap_lock_) |
Andreas Gampe | bdf7f1c | 2016-08-30 16:38:47 -0700 | [diff] [blame] | 1332 | REQUIRES_SHARED(Locks::mutator_lock_) { |
Mathieu Chartier | da7c650 | 2015-07-23 16:01:26 -0700 | [diff] [blame] | 1333 | if (kCheckLocks) { |
| 1334 | Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); |
| 1335 | Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); |
| 1336 | } |
| 1337 | mark_sweep_->MarkObject(root->AsMirrorPtr()); |
| 1338 | } |
| 1339 | |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1340 | private: |
| 1341 | MarkSweep* const mark_sweep_; |
| 1342 | }; |
| 1343 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 1344 | // Scans an object reference. Determines the type of the reference |
| 1345 | // and dispatches to a specialized scanning routine. |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1346 | void MarkSweep::ScanObject(mirror::Object* obj) { |
| 1347 | MarkVisitor mark_visitor(this); |
Mathieu Chartier | 407f702 | 2014-02-18 14:37:05 -0800 | [diff] [blame] | 1348 | DelayReferenceReferentVisitor ref_visitor(this); |
| 1349 | ScanObjectVisit(obj, mark_visitor, ref_visitor); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1350 | } |
| 1351 | |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 1352 | void MarkSweep::ProcessMarkStackParallel(size_t thread_count) { |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1353 | Thread* self = Thread::Current(); |
| 1354 | ThreadPool* thread_pool = GetHeap()->GetThreadPool(); |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 1355 | const size_t chunk_size = std::min(mark_stack_->Size() / thread_count + 1, |
| 1356 | static_cast<size_t>(MarkStackTask<false>::kMaxSize)); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1357 | CHECK_GT(chunk_size, 0U); |
| 1358 | // Split the current mark stack up into work tasks. |
Mathieu Chartier | cb535da | 2015-01-23 13:50:03 -0800 | [diff] [blame] | 1359 | for (auto* it = mark_stack_->Begin(), *end = mark_stack_->End(); it < end; ) { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1360 | const size_t delta = std::min(static_cast<size_t>(end - it), chunk_size); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 1361 | thread_pool->AddTask(self, new MarkStackTask<false>(thread_pool, this, delta, it)); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1362 | it += delta; |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1363 | } |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 1364 | thread_pool->SetMaxActiveWorkers(thread_count - 1); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1365 | thread_pool->StartWorkers(self); |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 1366 | thread_pool->Wait(self, true, true); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1367 | thread_pool->StopWorkers(self); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1368 | mark_stack_->Reset(); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 1369 | CHECK_EQ(work_chunks_created_.LoadSequentiallyConsistent(), |
| 1370 | work_chunks_deleted_.LoadSequentiallyConsistent()) |
| 1371 | << " some of the work chunks were leaked"; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 1372 | } |
| 1373 | |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 1374 | // Scan anything that's on the mark stack. |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1375 | void MarkSweep::ProcessMarkStack(bool paused) { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1376 | TimingLogger::ScopedTiming t(paused ? "(Paused)ProcessMarkStack" : __FUNCTION__, GetTimings()); |
Mathieu Chartier | 2775ee4 | 2013-08-20 17:43:47 -0700 | [diff] [blame] | 1377 | size_t thread_count = GetThreadCount(paused); |
| 1378 | if (kParallelProcessMarkStack && thread_count > 1 && |
| 1379 | mark_stack_->Size() >= kMinimumParallelMarkStackSize) { |
| 1380 | ProcessMarkStackParallel(thread_count); |
Mathieu Chartier | d8195f1 | 2012-10-05 12:21:28 -0700 | [diff] [blame] | 1381 | } else { |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1382 | // TODO: Tune this. |
| 1383 | static const size_t kFifoSize = 4; |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1384 | BoundedFifoPowerOfTwo<mirror::Object*, kFifoSize> prefetch_fifo; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1385 | for (;;) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1386 | mirror::Object* obj = nullptr; |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1387 | if (kUseMarkStackPrefetch) { |
| 1388 | while (!mark_stack_->IsEmpty() && prefetch_fifo.size() < kFifoSize) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1389 | mirror::Object* mark_stack_obj = mark_stack_->PopBack(); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 1390 | DCHECK(mark_stack_obj != nullptr); |
Andreas Gampe | 277ccbd | 2014-11-03 21:36:10 -0800 | [diff] [blame] | 1391 | __builtin_prefetch(mark_stack_obj); |
| 1392 | prefetch_fifo.push_back(mark_stack_obj); |
Mathieu Chartier | 94c32c5 | 2013-08-09 11:14:04 -0700 | [diff] [blame] | 1393 | } |
| 1394 | if (prefetch_fifo.empty()) { |
| 1395 | break; |
| 1396 | } |
| 1397 | obj = prefetch_fifo.front(); |
| 1398 | prefetch_fifo.pop_front(); |
| 1399 | } else { |
| 1400 | if (mark_stack_->IsEmpty()) { |
| 1401 | break; |
| 1402 | } |
| 1403 | obj = mark_stack_->PopBack(); |
| 1404 | } |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 1405 | DCHECK(obj != nullptr); |
Mathieu Chartier | d8195f1 | 2012-10-05 12:21:28 -0700 | [diff] [blame] | 1406 | ScanObject(obj); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 1407 | } |
| 1408 | } |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 1409 | } |
| 1410 | |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1411 | inline mirror::Object* MarkSweep::IsMarked(mirror::Object* object) { |
Mathieu Chartier | 763a31e | 2015-11-16 16:05:55 -0800 | [diff] [blame] | 1412 | if (immune_spaces_.IsInImmuneRegion(object)) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1413 | return object; |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 1414 | } |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 1415 | if (current_space_bitmap_->HasAddress(object)) { |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1416 | return current_space_bitmap_->Test(object) ? object : nullptr; |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 1417 | } |
Mathieu Chartier | 9750995 | 2015-07-13 14:35:43 -0700 | [diff] [blame] | 1418 | return mark_bitmap_->Test(object) ? object : nullptr; |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 1419 | } |
| 1420 | |
Mathieu Chartier | 2b82db4 | 2012-11-14 17:29:05 -0800 | [diff] [blame] | 1421 | void MarkSweep::FinishPhase() { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1422 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Mathieu Chartier | d22d548 | 2012-11-06 17:14:12 -0800 | [diff] [blame] | 1423 | if (kCountScannedTypes) { |
Mathieu Chartier | 52a7f5c | 2015-08-18 18:35:52 -0700 | [diff] [blame] | 1424 | VLOG(gc) |
| 1425 | << "MarkSweep scanned" |
| 1426 | << " no reference objects=" << no_reference_class_count_.LoadRelaxed() |
| 1427 | << " normal objects=" << normal_count_.LoadRelaxed() |
| 1428 | << " classes=" << class_count_.LoadRelaxed() |
| 1429 | << " object arrays=" << object_array_count_.LoadRelaxed() |
| 1430 | << " references=" << reference_count_.LoadRelaxed() |
| 1431 | << " other=" << other_count_.LoadRelaxed(); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1432 | } |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1433 | if (kCountTasks) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 1434 | VLOG(gc) << "Total number of work chunks allocated: " << work_chunks_created_.LoadRelaxed(); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1435 | } |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1436 | if (kMeasureOverhead) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 1437 | VLOG(gc) << "Overhead time " << PrettyDuration(overhead_time_.LoadRelaxed()); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1438 | } |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1439 | if (kProfileLargeObjects) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 1440 | VLOG(gc) << "Large objects tested " << large_object_test_.LoadRelaxed() |
| 1441 | << " marked " << large_object_mark_.LoadRelaxed(); |
Mathieu Chartier | 02b6a78 | 2012-10-26 13:51:26 -0700 | [diff] [blame] | 1442 | } |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 1443 | if (kCountMarkedObjects) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 1444 | VLOG(gc) << "Marked: null=" << mark_null_count_.LoadRelaxed() |
| 1445 | << " immune=" << mark_immune_count_.LoadRelaxed() |
| 1446 | << " fastpath=" << mark_fastpath_count_.LoadRelaxed() |
| 1447 | << " slowpath=" << mark_slowpath_count_.LoadRelaxed(); |
Mathieu Chartier | 0e54cd0 | 2014-03-20 12:41:23 -0700 | [diff] [blame] | 1448 | } |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 1449 | CHECK(mark_stack_->IsEmpty()); // Ensure that the mark stack is empty. |
Mathieu Chartier | 5301cd2 | 2012-05-31 12:11:36 -0700 | [diff] [blame] | 1450 | mark_stack_->Reset(); |
Mathieu Chartier | a9d82fe | 2016-01-25 20:06:11 -0800 | [diff] [blame] | 1451 | Thread* const self = Thread::Current(); |
| 1452 | ReaderMutexLock mu(self, *Locks::mutator_lock_); |
| 1453 | WriterMutexLock mu2(self, *Locks::heap_bitmap_lock_); |
Mathieu Chartier | 4aeec17 | 2014-03-27 16:09:46 -0700 | [diff] [blame] | 1454 | heap_->ClearMarkedObjects(); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 1455 | } |
| 1456 | |
Hiroshi Yamauchi | c93c530 | 2014-03-20 16:15:37 -0700 | [diff] [blame] | 1457 | void MarkSweep::RevokeAllThreadLocalBuffers() { |
| 1458 | if (kRevokeRosAllocThreadLocalBuffersAtCheckpoint && IsConcurrent()) { |
| 1459 | // If concurrent, rosalloc thread-local buffers are revoked at the |
| 1460 | // thread checkpoint. Bump pointer space thread-local buffers must |
| 1461 | // not be in use. |
| 1462 | GetHeap()->AssertAllBumpPointerSpaceThreadLocalBuffersAreRevoked(); |
| 1463 | } else { |
Mathieu Chartier | f5997b4 | 2014-06-20 10:37:54 -0700 | [diff] [blame] | 1464 | TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); |
Hiroshi Yamauchi | c93c530 | 2014-03-20 16:15:37 -0700 | [diff] [blame] | 1465 | GetHeap()->RevokeAllThreadLocalBuffers(); |
Hiroshi Yamauchi | c93c530 | 2014-03-20 16:15:37 -0700 | [diff] [blame] | 1466 | } |
| 1467 | } |
| 1468 | |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 1469 | } // namespace collector |
| 1470 | } // namespace gc |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 1471 | } // namespace art |