yangguo@chromium.org | 5f0b8ea | 2012-05-16 12:37:04 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "v8.h" |
| 29 | |
| 30 | #include "incremental-marking.h" |
| 31 | |
| 32 | #include "code-stubs.h" |
| 33 | #include "compilation-cache.h" |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 34 | #include "objects-visiting.h" |
| 35 | #include "objects-visiting-inl.h" |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 36 | #include "v8conversions.h" |
| 37 | |
| 38 | namespace v8 { |
| 39 | namespace internal { |
| 40 | |
| 41 | |
| 42 | IncrementalMarking::IncrementalMarking(Heap* heap) |
| 43 | : heap_(heap), |
| 44 | state_(STOPPED), |
| 45 | marking_deque_memory_(NULL), |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 46 | marking_deque_memory_committed_(false), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 47 | steps_count_(0), |
| 48 | steps_took_(0), |
| 49 | longest_step_(0.0), |
| 50 | old_generation_space_available_at_start_of_incremental_(0), |
| 51 | old_generation_space_used_at_start_of_incremental_(0), |
| 52 | steps_count_since_last_gc_(0), |
| 53 | steps_took_since_last_gc_(0), |
| 54 | should_hurry_(false), |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 55 | marking_speed_(0), |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 56 | allocated_(0), |
rossberg@chromium.org | b99c754 | 2013-05-31 11:40:45 +0000 | [diff] [blame] | 57 | no_marking_scope_depth_(0), |
| 58 | unscanned_bytes_of_large_object_(0) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | |
| 62 | void IncrementalMarking::TearDown() { |
| 63 | delete marking_deque_memory_; |
| 64 | } |
| 65 | |
| 66 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 67 | void IncrementalMarking::RecordWriteSlow(HeapObject* obj, |
| 68 | Object** slot, |
| 69 | Object* value) { |
ulan@chromium.org | 56c14af | 2012-09-20 12:51:09 +0000 | [diff] [blame] | 70 | if (BaseRecordWrite(obj, slot, value) && slot != NULL) { |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 71 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 72 | if (Marking::IsBlack(obj_bit)) { |
| 73 | // Object is not going to be rescanned we need to record the slot. |
| 74 | heap_->mark_compact_collector()->RecordSlot( |
| 75 | HeapObject::RawField(obj, 0), slot, value); |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 81 | void IncrementalMarking::RecordWriteFromCode(HeapObject* obj, |
ulan@chromium.org | 8e8d882 | 2012-11-23 14:36:46 +0000 | [diff] [blame] | 82 | Object** slot, |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 83 | Isolate* isolate) { |
| 84 | ASSERT(obj->IsHeapObject()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 85 | IncrementalMarking* marking = isolate->heap()->incremental_marking(); |
| 86 | ASSERT(!marking->is_compacting_); |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 87 | |
| 88 | MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address()); |
| 89 | int counter = chunk->write_barrier_counter(); |
| 90 | if (counter < (MemoryChunk::kWriteBarrierCounterGranularity / 2)) { |
| 91 | marking->write_barriers_invoked_since_last_step_ += |
| 92 | MemoryChunk::kWriteBarrierCounterGranularity - |
| 93 | chunk->write_barrier_counter(); |
| 94 | chunk->set_write_barrier_counter( |
| 95 | MemoryChunk::kWriteBarrierCounterGranularity); |
| 96 | } |
| 97 | |
ulan@chromium.org | 8e8d882 | 2012-11-23 14:36:46 +0000 | [diff] [blame] | 98 | marking->RecordWrite(obj, slot, *slot); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | |
| 102 | void IncrementalMarking::RecordWriteForEvacuationFromCode(HeapObject* obj, |
| 103 | Object** slot, |
| 104 | Isolate* isolate) { |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 105 | ASSERT(obj->IsHeapObject()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 106 | IncrementalMarking* marking = isolate->heap()->incremental_marking(); |
| 107 | ASSERT(marking->is_compacting_); |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 108 | |
| 109 | MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address()); |
| 110 | int counter = chunk->write_barrier_counter(); |
| 111 | if (counter < (MemoryChunk::kWriteBarrierCounterGranularity / 2)) { |
| 112 | marking->write_barriers_invoked_since_last_step_ += |
| 113 | MemoryChunk::kWriteBarrierCounterGranularity - |
| 114 | chunk->write_barrier_counter(); |
| 115 | chunk->set_write_barrier_counter( |
| 116 | MemoryChunk::kWriteBarrierCounterGranularity); |
| 117 | } |
| 118 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 119 | marking->RecordWrite(obj, slot, *slot); |
| 120 | } |
| 121 | |
| 122 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 123 | void IncrementalMarking::RecordCodeTargetPatch(Code* host, |
| 124 | Address pc, |
| 125 | HeapObject* value) { |
| 126 | if (IsMarking()) { |
| 127 | RelocInfo rinfo(pc, RelocInfo::CODE_TARGET, 0, host); |
| 128 | RecordWriteIntoCode(host, &rinfo, value); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 133 | void IncrementalMarking::RecordCodeTargetPatch(Address pc, HeapObject* value) { |
| 134 | if (IsMarking()) { |
| 135 | Code* host = heap_->isolate()->inner_pointer_to_code_cache()-> |
| 136 | GcSafeFindCodeForInnerPointer(pc); |
| 137 | RelocInfo rinfo(pc, RelocInfo::CODE_TARGET, 0, host); |
| 138 | RecordWriteIntoCode(host, &rinfo, value); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 143 | void IncrementalMarking::RecordWriteOfCodeEntrySlow(JSFunction* host, |
ulan@chromium.org | 56c14af | 2012-09-20 12:51:09 +0000 | [diff] [blame] | 144 | Object** slot, |
| 145 | Code* value) { |
| 146 | if (BaseRecordWrite(host, slot, value)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 147 | ASSERT(slot != NULL); |
| 148 | heap_->mark_compact_collector()-> |
| 149 | RecordCodeEntrySlot(reinterpret_cast<Address>(slot), value); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 154 | void IncrementalMarking::RecordWriteIntoCodeSlow(HeapObject* obj, |
| 155 | RelocInfo* rinfo, |
| 156 | Object* value) { |
| 157 | MarkBit value_bit = Marking::MarkBitFrom(HeapObject::cast(value)); |
| 158 | if (Marking::IsWhite(value_bit)) { |
| 159 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 160 | if (Marking::IsBlack(obj_bit)) { |
| 161 | BlackToGreyAndUnshift(obj, obj_bit); |
| 162 | RestartIfNotMarking(); |
| 163 | } |
| 164 | // Object is either grey or white. It will be scanned if survives. |
| 165 | return; |
| 166 | } |
| 167 | |
| 168 | if (is_compacting_) { |
| 169 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 170 | if (Marking::IsBlack(obj_bit)) { |
| 171 | // Object is not going to be rescanned. We need to record the slot. |
| 172 | heap_->mark_compact_collector()->RecordRelocSlot(rinfo, |
| 173 | Code::cast(value)); |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 178 | |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 179 | static void MarkObjectGreyDoNotEnqueue(Object* obj) { |
| 180 | if (obj->IsHeapObject()) { |
| 181 | HeapObject* heap_obj = HeapObject::cast(obj); |
| 182 | MarkBit mark_bit = Marking::MarkBitFrom(HeapObject::cast(obj)); |
| 183 | if (Marking::IsBlack(mark_bit)) { |
| 184 | MemoryChunk::IncrementLiveBytesFromGC(heap_obj->address(), |
| 185 | -heap_obj->Size()); |
| 186 | } |
| 187 | Marking::AnyToGrey(mark_bit); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 192 | static inline void MarkBlackOrKeepGrey(HeapObject* heap_object, |
| 193 | MarkBit mark_bit, |
| 194 | int size) { |
| 195 | ASSERT(!Marking::IsImpossible(mark_bit)); |
| 196 | if (mark_bit.Get()) return; |
| 197 | mark_bit.Set(); |
| 198 | MemoryChunk::IncrementLiveBytesFromGC(heap_object->address(), size); |
| 199 | ASSERT(Marking::IsBlack(mark_bit)); |
| 200 | } |
| 201 | |
| 202 | |
| 203 | static inline void MarkBlackOrKeepBlack(HeapObject* heap_object, |
| 204 | MarkBit mark_bit, |
| 205 | int size) { |
| 206 | ASSERT(!Marking::IsImpossible(mark_bit)); |
| 207 | if (Marking::IsBlack(mark_bit)) return; |
| 208 | Marking::MarkBlack(mark_bit); |
| 209 | MemoryChunk::IncrementLiveBytesFromGC(heap_object->address(), size); |
| 210 | ASSERT(Marking::IsBlack(mark_bit)); |
| 211 | } |
| 212 | |
| 213 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 214 | class IncrementalMarkingMarkingVisitor |
| 215 | : public StaticMarkingVisitor<IncrementalMarkingMarkingVisitor> { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 216 | public: |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 217 | static void Initialize() { |
| 218 | StaticMarkingVisitor<IncrementalMarkingMarkingVisitor>::Initialize(); |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 219 | table_.Register(kVisitFixedArray, &VisitFixedArrayIncremental); |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 220 | table_.Register(kVisitNativeContext, &VisitNativeContextIncremental); |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 221 | table_.Register(kVisitJSRegExp, &VisitJSRegExp); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 222 | } |
| 223 | |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 224 | static const int kProgressBarScanningChunk = 32 * 1024; |
| 225 | |
| 226 | static void VisitFixedArrayIncremental(Map* map, HeapObject* object) { |
| 227 | MemoryChunk* chunk = MemoryChunk::FromAddress(object->address()); |
| 228 | // TODO(mstarzinger): Move setting of the flag to the allocation site of |
| 229 | // the array. The visitor should just check the flag. |
| 230 | if (FLAG_use_marking_progress_bar && |
| 231 | chunk->owner()->identity() == LO_SPACE) { |
| 232 | chunk->SetFlag(MemoryChunk::HAS_PROGRESS_BAR); |
| 233 | } |
| 234 | if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) { |
| 235 | Heap* heap = map->GetHeap(); |
| 236 | // When using a progress bar for large fixed arrays, scan only a chunk of |
| 237 | // the array and try to push it onto the marking deque again until it is |
| 238 | // fully scanned. Fall back to scanning it through to the end in case this |
| 239 | // fails because of a full deque. |
| 240 | int object_size = FixedArray::BodyDescriptor::SizeOf(map, object); |
| 241 | int start_offset = Max(FixedArray::BodyDescriptor::kStartOffset, |
| 242 | chunk->progress_bar()); |
| 243 | int end_offset = Min(object_size, |
| 244 | start_offset + kProgressBarScanningChunk); |
rossberg@chromium.org | b99c754 | 2013-05-31 11:40:45 +0000 | [diff] [blame] | 245 | int already_scanned_offset = start_offset; |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 246 | bool scan_until_end = false; |
| 247 | do { |
| 248 | VisitPointersWithAnchor(heap, |
| 249 | HeapObject::RawField(object, 0), |
| 250 | HeapObject::RawField(object, start_offset), |
| 251 | HeapObject::RawField(object, end_offset)); |
| 252 | start_offset = end_offset; |
| 253 | end_offset = Min(object_size, end_offset + kProgressBarScanningChunk); |
| 254 | scan_until_end = heap->incremental_marking()->marking_deque()->IsFull(); |
| 255 | } while (scan_until_end && start_offset < object_size); |
| 256 | chunk->set_progress_bar(start_offset); |
| 257 | if (start_offset < object_size) { |
| 258 | heap->incremental_marking()->marking_deque()->UnshiftGrey(object); |
rossberg@chromium.org | b99c754 | 2013-05-31 11:40:45 +0000 | [diff] [blame] | 259 | heap->incremental_marking()->NotifyIncompleteScanOfObject( |
| 260 | object_size - (start_offset - already_scanned_offset)); |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 261 | } |
| 262 | } else { |
| 263 | FixedArrayVisitor::Visit(map, object); |
| 264 | } |
| 265 | } |
| 266 | |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 267 | static void VisitNativeContextIncremental(Map* map, HeapObject* object) { |
| 268 | Context* context = Context::cast(object); |
| 269 | |
| 270 | // We will mark cache black with a separate pass |
| 271 | // when we finish marking. |
| 272 | MarkObjectGreyDoNotEnqueue(context->normalized_map_cache()); |
| 273 | VisitNativeContext(map, context); |
| 274 | } |
| 275 | |
jkummerow@chromium.org | ba72ec8 | 2013-07-22 09:21:20 +0000 | [diff] [blame] | 276 | static void VisitWeakCollection(Map* map, HeapObject* object) { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 277 | Heap* heap = map->GetHeap(); |
| 278 | VisitPointers(heap, |
jkummerow@chromium.org | ba72ec8 | 2013-07-22 09:21:20 +0000 | [diff] [blame] | 279 | HeapObject::RawField(object, |
| 280 | JSWeakCollection::kPropertiesOffset), |
| 281 | HeapObject::RawField(object, JSWeakCollection::kSize)); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 282 | } |
| 283 | |
svenpanne@chromium.org | c859c4f | 2012-10-15 11:51:39 +0000 | [diff] [blame] | 284 | static void BeforeVisitingSharedFunctionInfo(HeapObject* object) {} |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 285 | |
| 286 | INLINE(static void VisitPointer(Heap* heap, Object** p)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 287 | Object* obj = *p; |
| 288 | if (obj->NonFailureIsHeapObject()) { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 289 | heap->mark_compact_collector()->RecordSlot(p, p, obj); |
| 290 | MarkObject(heap, obj); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 291 | } |
| 292 | } |
| 293 | |
danno@chromium.org | 2ab0c3b | 2012-10-05 08:50:56 +0000 | [diff] [blame] | 294 | INLINE(static void VisitPointers(Heap* heap, Object** start, Object** end)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 295 | for (Object** p = start; p < end; p++) { |
| 296 | Object* obj = *p; |
| 297 | if (obj->NonFailureIsHeapObject()) { |
danno@chromium.org | 2ab0c3b | 2012-10-05 08:50:56 +0000 | [diff] [blame] | 298 | heap->mark_compact_collector()->RecordSlot(start, p, obj); |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 299 | MarkObject(heap, obj); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 300 | } |
| 301 | } |
| 302 | } |
| 303 | |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 304 | INLINE(static void VisitPointersWithAnchor(Heap* heap, |
| 305 | Object** anchor, |
| 306 | Object** start, |
| 307 | Object** end)) { |
| 308 | for (Object** p = start; p < end; p++) { |
| 309 | Object* obj = *p; |
| 310 | if (obj->NonFailureIsHeapObject()) { |
| 311 | heap->mark_compact_collector()->RecordSlot(anchor, p, obj); |
| 312 | MarkObject(heap, obj); |
| 313 | } |
| 314 | } |
| 315 | } |
| 316 | |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 317 | // Marks the object grey and pushes it on the marking stack. |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 318 | INLINE(static void MarkObject(Heap* heap, Object* obj)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 319 | HeapObject* heap_object = HeapObject::cast(obj); |
| 320 | MarkBit mark_bit = Marking::MarkBitFrom(heap_object); |
| 321 | if (mark_bit.data_only()) { |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 322 | MarkBlackOrKeepGrey(heap_object, mark_bit, heap_object->Size()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 323 | } else if (Marking::IsWhite(mark_bit)) { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 324 | heap->incremental_marking()->WhiteToGreyAndPush(heap_object, mark_bit); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 325 | } |
| 326 | } |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 327 | |
| 328 | // Marks the object black without pushing it on the marking stack. |
| 329 | // Returns true if object needed marking and false otherwise. |
| 330 | INLINE(static bool MarkObjectWithoutPush(Heap* heap, Object* obj)) { |
| 331 | HeapObject* heap_object = HeapObject::cast(obj); |
| 332 | MarkBit mark_bit = Marking::MarkBitFrom(heap_object); |
| 333 | if (Marking::IsWhite(mark_bit)) { |
| 334 | mark_bit.Set(); |
| 335 | MemoryChunk::IncrementLiveBytesFromGC(heap_object->address(), |
| 336 | heap_object->Size()); |
| 337 | return true; |
| 338 | } |
| 339 | return false; |
| 340 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 341 | }; |
| 342 | |
| 343 | |
| 344 | class IncrementalMarkingRootMarkingVisitor : public ObjectVisitor { |
| 345 | public: |
svenpanne@chromium.org | 83130cf | 2012-11-30 10:13:25 +0000 | [diff] [blame] | 346 | explicit IncrementalMarkingRootMarkingVisitor( |
| 347 | IncrementalMarking* incremental_marking) |
| 348 | : incremental_marking_(incremental_marking) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | void VisitPointer(Object** p) { |
| 352 | MarkObjectByPointer(p); |
| 353 | } |
| 354 | |
| 355 | void VisitPointers(Object** start, Object** end) { |
| 356 | for (Object** p = start; p < end; p++) MarkObjectByPointer(p); |
| 357 | } |
| 358 | |
| 359 | private: |
| 360 | void MarkObjectByPointer(Object** p) { |
| 361 | Object* obj = *p; |
| 362 | if (!obj->IsHeapObject()) return; |
| 363 | |
| 364 | HeapObject* heap_object = HeapObject::cast(obj); |
| 365 | MarkBit mark_bit = Marking::MarkBitFrom(heap_object); |
| 366 | if (mark_bit.data_only()) { |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 367 | MarkBlackOrKeepGrey(heap_object, mark_bit, heap_object->Size()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 368 | } else { |
| 369 | if (Marking::IsWhite(mark_bit)) { |
| 370 | incremental_marking_->WhiteToGreyAndPush(heap_object, mark_bit); |
| 371 | } |
| 372 | } |
| 373 | } |
| 374 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 375 | IncrementalMarking* incremental_marking_; |
| 376 | }; |
| 377 | |
| 378 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame] | 379 | void IncrementalMarking::Initialize() { |
| 380 | IncrementalMarkingMarkingVisitor::Initialize(); |
| 381 | } |
| 382 | |
| 383 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 384 | void IncrementalMarking::SetOldSpacePageFlags(MemoryChunk* chunk, |
| 385 | bool is_marking, |
| 386 | bool is_compacting) { |
| 387 | if (is_marking) { |
| 388 | chunk->SetFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING); |
| 389 | chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 390 | |
| 391 | // It's difficult to filter out slots recorded for large objects. |
| 392 | if (chunk->owner()->identity() == LO_SPACE && |
| 393 | chunk->size() > static_cast<size_t>(Page::kPageSize) && |
| 394 | is_compacting) { |
| 395 | chunk->SetFlag(MemoryChunk::RESCAN_ON_EVACUATION); |
| 396 | } |
| 397 | } else if (chunk->owner()->identity() == CELL_SPACE || |
danno@chromium.org | 4172848 | 2013-06-12 22:31:22 +0000 | [diff] [blame] | 398 | chunk->owner()->identity() == PROPERTY_CELL_SPACE || |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 399 | chunk->scan_on_scavenge()) { |
| 400 | chunk->ClearFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING); |
| 401 | chunk->ClearFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 402 | } else { |
| 403 | chunk->ClearFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING); |
| 404 | chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | |
| 409 | void IncrementalMarking::SetNewSpacePageFlags(NewSpacePage* chunk, |
| 410 | bool is_marking) { |
| 411 | chunk->SetFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING); |
| 412 | if (is_marking) { |
| 413 | chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 414 | } else { |
| 415 | chunk->ClearFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 416 | } |
| 417 | chunk->SetFlag(MemoryChunk::SCAN_ON_SCAVENGE); |
| 418 | } |
| 419 | |
| 420 | |
| 421 | void IncrementalMarking::DeactivateIncrementalWriteBarrierForSpace( |
| 422 | PagedSpace* space) { |
| 423 | PageIterator it(space); |
| 424 | while (it.has_next()) { |
| 425 | Page* p = it.next(); |
| 426 | SetOldSpacePageFlags(p, false, false); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | |
| 431 | void IncrementalMarking::DeactivateIncrementalWriteBarrierForSpace( |
| 432 | NewSpace* space) { |
| 433 | NewSpacePageIterator it(space); |
| 434 | while (it.has_next()) { |
| 435 | NewSpacePage* p = it.next(); |
| 436 | SetNewSpacePageFlags(p, false); |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | |
| 441 | void IncrementalMarking::DeactivateIncrementalWriteBarrier() { |
| 442 | DeactivateIncrementalWriteBarrierForSpace(heap_->old_pointer_space()); |
| 443 | DeactivateIncrementalWriteBarrierForSpace(heap_->old_data_space()); |
| 444 | DeactivateIncrementalWriteBarrierForSpace(heap_->cell_space()); |
danno@chromium.org | 4172848 | 2013-06-12 22:31:22 +0000 | [diff] [blame] | 445 | DeactivateIncrementalWriteBarrierForSpace(heap_->property_cell_space()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 446 | DeactivateIncrementalWriteBarrierForSpace(heap_->map_space()); |
| 447 | DeactivateIncrementalWriteBarrierForSpace(heap_->code_space()); |
| 448 | DeactivateIncrementalWriteBarrierForSpace(heap_->new_space()); |
| 449 | |
| 450 | LargePage* lop = heap_->lo_space()->first_page(); |
| 451 | while (lop->is_valid()) { |
| 452 | SetOldSpacePageFlags(lop, false, false); |
| 453 | lop = lop->next_page(); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | |
| 458 | void IncrementalMarking::ActivateIncrementalWriteBarrier(PagedSpace* space) { |
| 459 | PageIterator it(space); |
| 460 | while (it.has_next()) { |
| 461 | Page* p = it.next(); |
| 462 | SetOldSpacePageFlags(p, true, is_compacting_); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | |
| 467 | void IncrementalMarking::ActivateIncrementalWriteBarrier(NewSpace* space) { |
| 468 | NewSpacePageIterator it(space->ToSpaceStart(), space->ToSpaceEnd()); |
| 469 | while (it.has_next()) { |
| 470 | NewSpacePage* p = it.next(); |
| 471 | SetNewSpacePageFlags(p, true); |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | |
| 476 | void IncrementalMarking::ActivateIncrementalWriteBarrier() { |
| 477 | ActivateIncrementalWriteBarrier(heap_->old_pointer_space()); |
| 478 | ActivateIncrementalWriteBarrier(heap_->old_data_space()); |
| 479 | ActivateIncrementalWriteBarrier(heap_->cell_space()); |
danno@chromium.org | 4172848 | 2013-06-12 22:31:22 +0000 | [diff] [blame] | 480 | ActivateIncrementalWriteBarrier(heap_->property_cell_space()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 481 | ActivateIncrementalWriteBarrier(heap_->map_space()); |
| 482 | ActivateIncrementalWriteBarrier(heap_->code_space()); |
| 483 | ActivateIncrementalWriteBarrier(heap_->new_space()); |
| 484 | |
| 485 | LargePage* lop = heap_->lo_space()->first_page(); |
| 486 | while (lop->is_valid()) { |
| 487 | SetOldSpacePageFlags(lop, true, is_compacting_); |
| 488 | lop = lop->next_page(); |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | |
| 493 | bool IncrementalMarking::WorthActivating() { |
| 494 | #ifndef DEBUG |
| 495 | static const intptr_t kActivationThreshold = 8 * MB; |
| 496 | #else |
| 497 | // TODO(gc) consider setting this to some low level so that some |
| 498 | // debug tests run with incremental marking and some without. |
| 499 | static const intptr_t kActivationThreshold = 0; |
| 500 | #endif |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 501 | // Only start incremental marking in a safe state: 1) when expose GC is |
| 502 | // deactivated, 2) when incremental marking is turned on, 3) when we are |
| 503 | // currently not in a GC, and 4) when we are currently not serializing |
| 504 | // or deserializing the heap. |
svenpanne@chromium.org | 83130cf | 2012-11-30 10:13:25 +0000 | [diff] [blame] | 505 | return !FLAG_expose_gc && |
| 506 | FLAG_incremental_marking && |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 507 | FLAG_incremental_marking_steps && |
| 508 | heap_->gc_state() == Heap::NOT_IN_GC && |
rossberg@chromium.org | b4b2aa6 | 2011-10-13 09:49:59 +0000 | [diff] [blame] | 509 | !Serializer::enabled() && |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 510 | heap_->isolate()->IsInitialized() && |
yangguo@chromium.org | 154ff99 | 2012-03-13 08:09:54 +0000 | [diff] [blame] | 511 | heap_->PromotedSpaceSizeOfObjects() > kActivationThreshold; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | |
| 515 | void IncrementalMarking::ActivateGeneratedStub(Code* stub) { |
| 516 | ASSERT(RecordWriteStub::GetMode(stub) == |
| 517 | RecordWriteStub::STORE_BUFFER_ONLY); |
| 518 | |
| 519 | if (!IsMarking()) { |
| 520 | // Initially stub is generated in STORE_BUFFER_ONLY mode thus |
| 521 | // we don't need to do anything if incremental marking is |
| 522 | // not active. |
| 523 | } else if (IsCompacting()) { |
| 524 | RecordWriteStub::Patch(stub, RecordWriteStub::INCREMENTAL_COMPACTION); |
| 525 | } else { |
| 526 | RecordWriteStub::Patch(stub, RecordWriteStub::INCREMENTAL); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | |
| 531 | static void PatchIncrementalMarkingRecordWriteStubs( |
| 532 | Heap* heap, RecordWriteStub::Mode mode) { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 533 | UnseededNumberDictionary* stubs = heap->code_stubs(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 534 | |
| 535 | int capacity = stubs->Capacity(); |
| 536 | for (int i = 0; i < capacity; i++) { |
| 537 | Object* k = stubs->KeyAt(i); |
| 538 | if (stubs->IsKey(k)) { |
| 539 | uint32_t key = NumberToUint32(k); |
| 540 | |
| 541 | if (CodeStub::MajorKeyFromKey(key) == |
| 542 | CodeStub::RecordWrite) { |
| 543 | Object* e = stubs->ValueAt(i); |
| 544 | if (e->IsCode()) { |
| 545 | RecordWriteStub::Patch(Code::cast(e), mode); |
| 546 | } |
| 547 | } |
| 548 | } |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | |
| 553 | void IncrementalMarking::EnsureMarkingDequeIsCommitted() { |
| 554 | if (marking_deque_memory_ == NULL) { |
| 555 | marking_deque_memory_ = new VirtualMemory(4 * MB); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 556 | } |
| 557 | if (!marking_deque_memory_committed_) { |
| 558 | bool success = marking_deque_memory_->Commit( |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 559 | reinterpret_cast<Address>(marking_deque_memory_->address()), |
| 560 | marking_deque_memory_->size(), |
| 561 | false); // Not executable. |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 562 | CHECK(success); |
| 563 | marking_deque_memory_committed_ = true; |
| 564 | } |
| 565 | } |
| 566 | |
mstarzinger@chromium.org | e0e1b0d | 2013-07-08 08:38:06 +0000 | [diff] [blame] | 567 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 568 | void IncrementalMarking::UncommitMarkingDeque() { |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 569 | if (state_ == STOPPED && marking_deque_memory_committed_) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 570 | bool success = marking_deque_memory_->Uncommit( |
| 571 | reinterpret_cast<Address>(marking_deque_memory_->address()), |
| 572 | marking_deque_memory_->size()); |
| 573 | CHECK(success); |
| 574 | marking_deque_memory_committed_ = false; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 575 | } |
| 576 | } |
| 577 | |
| 578 | |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 579 | void IncrementalMarking::Start(CompactionFlag flag) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 580 | if (FLAG_trace_incremental_marking) { |
| 581 | PrintF("[IncrementalMarking] Start\n"); |
| 582 | } |
| 583 | ASSERT(FLAG_incremental_marking); |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 584 | ASSERT(FLAG_incremental_marking_steps); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 585 | ASSERT(state_ == STOPPED); |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 586 | ASSERT(heap_->gc_state() == Heap::NOT_IN_GC); |
| 587 | ASSERT(!Serializer::enabled()); |
| 588 | ASSERT(heap_->isolate()->IsInitialized()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 589 | |
| 590 | ResetStepCounters(); |
| 591 | |
mmassi@chromium.org | 2f0efde | 2013-02-06 14:12:58 +0000 | [diff] [blame] | 592 | if (heap_->IsSweepingComplete()) { |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 593 | StartMarking(flag); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 594 | } else { |
| 595 | if (FLAG_trace_incremental_marking) { |
| 596 | PrintF("[IncrementalMarking] Start sweeping.\n"); |
| 597 | } |
| 598 | state_ = SWEEPING; |
| 599 | } |
| 600 | |
| 601 | heap_->new_space()->LowerInlineAllocationLimit(kAllocatedThreshold); |
| 602 | } |
| 603 | |
| 604 | |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 605 | void IncrementalMarking::StartMarking(CompactionFlag flag) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 606 | if (FLAG_trace_incremental_marking) { |
| 607 | PrintF("[IncrementalMarking] Start marking\n"); |
| 608 | } |
| 609 | |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 610 | is_compacting_ = !FLAG_never_compact && (flag == ALLOW_COMPACTION) && |
jkummerow@chromium.org | ab7dad4 | 2012-02-07 12:07:34 +0000 | [diff] [blame] | 611 | heap_->mark_compact_collector()->StartCompaction( |
| 612 | MarkCompactCollector::INCREMENTAL_COMPACTION); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 613 | |
| 614 | state_ = MARKING; |
| 615 | |
| 616 | RecordWriteStub::Mode mode = is_compacting_ ? |
| 617 | RecordWriteStub::INCREMENTAL_COMPACTION : RecordWriteStub::INCREMENTAL; |
| 618 | |
| 619 | PatchIncrementalMarkingRecordWriteStubs(heap_, mode); |
| 620 | |
| 621 | EnsureMarkingDequeIsCommitted(); |
| 622 | |
| 623 | // Initialize marking stack. |
| 624 | Address addr = static_cast<Address>(marking_deque_memory_->address()); |
| 625 | size_t size = marking_deque_memory_->size(); |
| 626 | if (FLAG_force_marking_deque_overflows) size = 64 * kPointerSize; |
| 627 | marking_deque_.Initialize(addr, addr + size); |
| 628 | |
| 629 | ActivateIncrementalWriteBarrier(); |
| 630 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 631 | // Marking bits are cleared by the sweeper. |
svenpanne@chromium.org | c859c4f | 2012-10-15 11:51:39 +0000 | [diff] [blame] | 632 | #ifdef VERIFY_HEAP |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 633 | if (FLAG_verify_heap) { |
| 634 | heap_->mark_compact_collector()->VerifyMarkbitsAreClean(); |
| 635 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 636 | #endif |
| 637 | |
| 638 | heap_->CompletelyClearInstanceofCache(); |
| 639 | heap_->isolate()->compilation_cache()->MarkCompactPrologue(); |
| 640 | |
| 641 | if (FLAG_cleanup_code_caches_at_gc) { |
| 642 | // We will mark cache black with a separate pass |
| 643 | // when we finish marking. |
| 644 | MarkObjectGreyDoNotEnqueue(heap_->polymorphic_code_cache()); |
| 645 | } |
| 646 | |
| 647 | // Mark strong roots grey. |
svenpanne@chromium.org | 83130cf | 2012-11-30 10:13:25 +0000 | [diff] [blame] | 648 | IncrementalMarkingRootMarkingVisitor visitor(this); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 649 | heap_->IterateStrongRoots(&visitor, VISIT_ONLY_STRONG); |
| 650 | |
jkummerow@chromium.org | 25b0e21 | 2013-10-04 15:38:52 +0000 | [diff] [blame] | 651 | heap_->mark_compact_collector()->MarkWeakObjectToCodeTable(); |
| 652 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 653 | // Ready to start incremental marking. |
| 654 | if (FLAG_trace_incremental_marking) { |
| 655 | PrintF("[IncrementalMarking] Running\n"); |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | |
| 660 | void IncrementalMarking::PrepareForScavenge() { |
| 661 | if (!IsMarking()) return; |
| 662 | NewSpacePageIterator it(heap_->new_space()->FromSpaceStart(), |
| 663 | heap_->new_space()->FromSpaceEnd()); |
| 664 | while (it.has_next()) { |
| 665 | Bitmap::Clear(it.next()); |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | |
| 670 | void IncrementalMarking::UpdateMarkingDequeAfterScavenge() { |
| 671 | if (!IsMarking()) return; |
| 672 | |
| 673 | int current = marking_deque_.bottom(); |
| 674 | int mask = marking_deque_.mask(); |
| 675 | int limit = marking_deque_.top(); |
| 676 | HeapObject** array = marking_deque_.array(); |
| 677 | int new_top = current; |
| 678 | |
| 679 | Map* filler_map = heap_->one_pointer_filler_map(); |
| 680 | |
| 681 | while (current != limit) { |
| 682 | HeapObject* obj = array[current]; |
| 683 | ASSERT(obj->IsHeapObject()); |
| 684 | current = ((current + 1) & mask); |
| 685 | if (heap_->InNewSpace(obj)) { |
| 686 | MapWord map_word = obj->map_word(); |
| 687 | if (map_word.IsForwardingAddress()) { |
| 688 | HeapObject* dest = map_word.ToForwardingAddress(); |
| 689 | array[new_top] = dest; |
| 690 | new_top = ((new_top + 1) & mask); |
| 691 | ASSERT(new_top != marking_deque_.bottom()); |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 692 | #ifdef DEBUG |
| 693 | MarkBit mark_bit = Marking::MarkBitFrom(obj); |
| 694 | ASSERT(Marking::IsGrey(mark_bit) || |
| 695 | (obj->IsFiller() && Marking::IsWhite(mark_bit))); |
| 696 | #endif |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 697 | } |
| 698 | } else if (obj->map() != filler_map) { |
| 699 | // Skip one word filler objects that appear on the |
| 700 | // stack when we perform in place array shift. |
| 701 | array[new_top] = obj; |
| 702 | new_top = ((new_top + 1) & mask); |
| 703 | ASSERT(new_top != marking_deque_.bottom()); |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 704 | #ifdef DEBUG |
| 705 | MarkBit mark_bit = Marking::MarkBitFrom(obj); |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 706 | MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address()); |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 707 | ASSERT(Marking::IsGrey(mark_bit) || |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 708 | (obj->IsFiller() && Marking::IsWhite(mark_bit)) || |
| 709 | (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR) && |
| 710 | Marking::IsBlack(mark_bit))); |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 711 | #endif |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 712 | } |
| 713 | } |
| 714 | marking_deque_.set_top(new_top); |
| 715 | |
| 716 | steps_took_since_last_gc_ = 0; |
| 717 | steps_count_since_last_gc_ = 0; |
| 718 | longest_step_ = 0.0; |
| 719 | } |
| 720 | |
| 721 | |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 722 | void IncrementalMarking::VisitObject(Map* map, HeapObject* obj, int size) { |
| 723 | MarkBit map_mark_bit = Marking::MarkBitFrom(map); |
| 724 | if (Marking::IsWhite(map_mark_bit)) { |
| 725 | WhiteToGreyAndPush(map, map_mark_bit); |
| 726 | } |
| 727 | |
| 728 | IncrementalMarkingMarkingVisitor::IterateBody(map, obj); |
| 729 | |
yangguo@chromium.org | fb37721 | 2012-11-16 14:43:43 +0000 | [diff] [blame] | 730 | MarkBit mark_bit = Marking::MarkBitFrom(obj); |
| 731 | #ifdef DEBUG |
| 732 | MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address()); |
| 733 | SLOW_ASSERT(Marking::IsGrey(mark_bit) || |
| 734 | (obj->IsFiller() && Marking::IsWhite(mark_bit)) || |
| 735 | (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR) && |
| 736 | Marking::IsBlack(mark_bit))); |
| 737 | #endif |
| 738 | MarkBlackOrKeepBlack(obj, mark_bit, size); |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 739 | } |
| 740 | |
| 741 | |
| 742 | void IncrementalMarking::ProcessMarkingDeque(intptr_t bytes_to_process) { |
| 743 | Map* filler_map = heap_->one_pointer_filler_map(); |
| 744 | while (!marking_deque_.IsEmpty() && bytes_to_process > 0) { |
| 745 | HeapObject* obj = marking_deque_.Pop(); |
| 746 | |
| 747 | // Explicitly skip one word fillers. Incremental markbit patterns are |
| 748 | // correct only for objects that occupy at least two words. |
| 749 | Map* map = obj->map(); |
| 750 | if (map == filler_map) continue; |
| 751 | |
| 752 | int size = obj->SizeFromMap(map); |
rossberg@chromium.org | b99c754 | 2013-05-31 11:40:45 +0000 | [diff] [blame] | 753 | unscanned_bytes_of_large_object_ = 0; |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 754 | VisitObject(map, obj, size); |
rossberg@chromium.org | b99c754 | 2013-05-31 11:40:45 +0000 | [diff] [blame] | 755 | bytes_to_process -= (size - unscanned_bytes_of_large_object_); |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 756 | } |
| 757 | } |
| 758 | |
| 759 | |
| 760 | void IncrementalMarking::ProcessMarkingDeque() { |
| 761 | Map* filler_map = heap_->one_pointer_filler_map(); |
| 762 | while (!marking_deque_.IsEmpty()) { |
| 763 | HeapObject* obj = marking_deque_.Pop(); |
| 764 | |
| 765 | // Explicitly skip one word fillers. Incremental markbit patterns are |
| 766 | // correct only for objects that occupy at least two words. |
| 767 | Map* map = obj->map(); |
| 768 | if (map == filler_map) continue; |
| 769 | |
| 770 | VisitObject(map, obj, obj->SizeFromMap(map)); |
| 771 | } |
| 772 | } |
| 773 | |
| 774 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 775 | void IncrementalMarking::Hurry() { |
| 776 | if (state() == MARKING) { |
| 777 | double start = 0.0; |
mstarzinger@chromium.org | e3b8d0f | 2013-02-01 09:06:41 +0000 | [diff] [blame] | 778 | if (FLAG_trace_incremental_marking || FLAG_print_cumulative_gc_stat) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 779 | start = OS::TimeCurrentMillis(); |
mstarzinger@chromium.org | e3b8d0f | 2013-02-01 09:06:41 +0000 | [diff] [blame] | 780 | if (FLAG_trace_incremental_marking) { |
| 781 | PrintF("[IncrementalMarking] Hurry\n"); |
| 782 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 783 | } |
| 784 | // TODO(gc) hurry can mark objects it encounters black as mutator |
| 785 | // was stopped. |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 786 | ProcessMarkingDeque(); |
danno@chromium.org | 2ab0c3b | 2012-10-05 08:50:56 +0000 | [diff] [blame] | 787 | state_ = COMPLETE; |
mstarzinger@chromium.org | e3b8d0f | 2013-02-01 09:06:41 +0000 | [diff] [blame] | 788 | if (FLAG_trace_incremental_marking || FLAG_print_cumulative_gc_stat) { |
danno@chromium.org | 2ab0c3b | 2012-10-05 08:50:56 +0000 | [diff] [blame] | 789 | double end = OS::TimeCurrentMillis(); |
mstarzinger@chromium.org | e3b8d0f | 2013-02-01 09:06:41 +0000 | [diff] [blame] | 790 | double delta = end - start; |
| 791 | heap_->AddMarkingTime(delta); |
| 792 | if (FLAG_trace_incremental_marking) { |
| 793 | PrintF("[IncrementalMarking] Complete (hurry), spent %d ms.\n", |
| 794 | static_cast<int>(delta)); |
| 795 | } |
danno@chromium.org | 2ab0c3b | 2012-10-05 08:50:56 +0000 | [diff] [blame] | 796 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 797 | } |
| 798 | |
| 799 | if (FLAG_cleanup_code_caches_at_gc) { |
| 800 | PolymorphicCodeCache* poly_cache = heap_->polymorphic_code_cache(); |
| 801 | Marking::GreyToBlack(Marking::MarkBitFrom(poly_cache)); |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 802 | MemoryChunk::IncrementLiveBytesFromGC(poly_cache->address(), |
| 803 | PolymorphicCodeCache::kSize); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 804 | } |
| 805 | |
yangguo@chromium.org | 46839fb | 2012-08-28 09:06:19 +0000 | [diff] [blame] | 806 | Object* context = heap_->native_contexts_list(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 807 | while (!context->IsUndefined()) { |
ricow@chromium.org | 7ad6522 | 2011-12-19 12:13:11 +0000 | [diff] [blame] | 808 | // GC can happen when the context is not fully initialized, |
| 809 | // so the cache can be undefined. |
| 810 | HeapObject* cache = HeapObject::cast( |
| 811 | Context::cast(context)->get(Context::NORMALIZED_MAP_CACHE_INDEX)); |
| 812 | if (!cache->IsUndefined()) { |
| 813 | MarkBit mark_bit = Marking::MarkBitFrom(cache); |
| 814 | if (Marking::IsGrey(mark_bit)) { |
| 815 | Marking::GreyToBlack(mark_bit); |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 816 | MemoryChunk::IncrementLiveBytesFromGC(cache->address(), cache->Size()); |
ricow@chromium.org | 7ad6522 | 2011-12-19 12:13:11 +0000 | [diff] [blame] | 817 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 818 | } |
| 819 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
| 820 | } |
| 821 | } |
| 822 | |
| 823 | |
| 824 | void IncrementalMarking::Abort() { |
| 825 | if (IsStopped()) return; |
| 826 | if (FLAG_trace_incremental_marking) { |
| 827 | PrintF("[IncrementalMarking] Aborting.\n"); |
| 828 | } |
| 829 | heap_->new_space()->LowerInlineAllocationLimit(0); |
| 830 | IncrementalMarking::set_should_hurry(false); |
| 831 | ResetStepCounters(); |
| 832 | if (IsMarking()) { |
| 833 | PatchIncrementalMarkingRecordWriteStubs(heap_, |
| 834 | RecordWriteStub::STORE_BUFFER_ONLY); |
| 835 | DeactivateIncrementalWriteBarrier(); |
| 836 | |
| 837 | if (is_compacting_) { |
| 838 | LargeObjectIterator it(heap_->lo_space()); |
| 839 | for (HeapObject* obj = it.Next(); obj != NULL; obj = it.Next()) { |
| 840 | Page* p = Page::FromAddress(obj->address()); |
| 841 | if (p->IsFlagSet(Page::RESCAN_ON_EVACUATION)) { |
| 842 | p->ClearFlag(Page::RESCAN_ON_EVACUATION); |
| 843 | } |
| 844 | } |
| 845 | } |
| 846 | } |
| 847 | heap_->isolate()->stack_guard()->Continue(GC_REQUEST); |
| 848 | state_ = STOPPED; |
| 849 | is_compacting_ = false; |
| 850 | } |
| 851 | |
| 852 | |
| 853 | void IncrementalMarking::Finalize() { |
| 854 | Hurry(); |
| 855 | state_ = STOPPED; |
| 856 | is_compacting_ = false; |
| 857 | heap_->new_space()->LowerInlineAllocationLimit(0); |
| 858 | IncrementalMarking::set_should_hurry(false); |
| 859 | ResetStepCounters(); |
| 860 | PatchIncrementalMarkingRecordWriteStubs(heap_, |
| 861 | RecordWriteStub::STORE_BUFFER_ONLY); |
| 862 | DeactivateIncrementalWriteBarrier(); |
| 863 | ASSERT(marking_deque_.IsEmpty()); |
| 864 | heap_->isolate()->stack_guard()->Continue(GC_REQUEST); |
| 865 | } |
| 866 | |
| 867 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 868 | void IncrementalMarking::MarkingComplete(CompletionAction action) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 869 | state_ = COMPLETE; |
| 870 | // We will set the stack guard to request a GC now. This will mean the rest |
| 871 | // of the GC gets performed as soon as possible (we can't do a GC here in a |
| 872 | // record-write context). If a few things get allocated between now and then |
| 873 | // that shouldn't make us do a scavenge and keep being incremental, so we set |
| 874 | // the should-hurry flag to indicate that there can't be much work left to do. |
| 875 | set_should_hurry(true); |
| 876 | if (FLAG_trace_incremental_marking) { |
| 877 | PrintF("[IncrementalMarking] Complete (normal).\n"); |
| 878 | } |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 879 | if (action == GC_VIA_STACK_GUARD) { |
svenpanne@chromium.org | ecb9dd6 | 2011-12-01 08:22:35 +0000 | [diff] [blame] | 880 | heap_->isolate()->stack_guard()->RequestGC(); |
| 881 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 882 | } |
| 883 | |
| 884 | |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 885 | void IncrementalMarking::OldSpaceStep(intptr_t allocated) { |
| 886 | if (IsStopped() && WorthActivating() && heap_->NextGCIsLikelyToBeFull()) { |
| 887 | // TODO(hpayer): Let's play safe for now, but compaction should be |
| 888 | // in principle possible. |
| 889 | Start(PREVENT_COMPACTION); |
| 890 | } else { |
| 891 | Step(allocated * kFastMarking / kInitialMarkingSpeed, GC_VIA_STACK_GUARD); |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 896 | void IncrementalMarking::Step(intptr_t allocated_bytes, |
| 897 | CompletionAction action) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 898 | if (heap_->gc_state() != Heap::NOT_IN_GC || |
| 899 | !FLAG_incremental_marking || |
| 900 | !FLAG_incremental_marking_steps || |
| 901 | (state_ != SWEEPING && state_ != MARKING)) { |
| 902 | return; |
| 903 | } |
| 904 | |
| 905 | allocated_ += allocated_bytes; |
| 906 | |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 907 | if (allocated_ < kAllocatedThreshold && |
| 908 | write_barriers_invoked_since_last_step_ < |
| 909 | kWriteBarriersInvokedThreshold) { |
| 910 | return; |
| 911 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 912 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 913 | if (state_ == MARKING && no_marking_scope_depth_ > 0) return; |
| 914 | |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 915 | // The marking speed is driven either by the allocation rate or by the rate |
| 916 | // at which we are having to check the color of objects in the write barrier. |
| 917 | // It is possible for a tight non-allocating loop to run a lot of write |
| 918 | // barriers before we get here and check them (marking can only take place on |
| 919 | // allocation), so to reduce the lumpiness we don't use the write barriers |
| 920 | // invoked since last step directly to determine the amount of work to do. |
| 921 | intptr_t bytes_to_process = |
jkummerow@chromium.org | 5323a9c | 2012-12-10 19:00:50 +0000 | [diff] [blame] | 922 | marking_speed_ * Max(allocated_, write_barriers_invoked_since_last_step_); |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 923 | allocated_ = 0; |
| 924 | write_barriers_invoked_since_last_step_ = 0; |
| 925 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 926 | bytes_scanned_ += bytes_to_process; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 927 | |
| 928 | double start = 0; |
| 929 | |
mstarzinger@chromium.org | e3b8d0f | 2013-02-01 09:06:41 +0000 | [diff] [blame] | 930 | if (FLAG_trace_incremental_marking || FLAG_trace_gc || |
| 931 | FLAG_print_cumulative_gc_stat) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 932 | start = OS::TimeCurrentMillis(); |
| 933 | } |
| 934 | |
| 935 | if (state_ == SWEEPING) { |
ulan@chromium.org | 750145a | 2013-03-07 15:14:13 +0000 | [diff] [blame] | 936 | if (heap_->EnsureSweepersProgressed(static_cast<int>(bytes_to_process))) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 937 | bytes_scanned_ = 0; |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 938 | StartMarking(PREVENT_COMPACTION); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 939 | } |
| 940 | } else if (state_ == MARKING) { |
mvstanton@chromium.org | e4ac3ef | 2012-11-12 14:53:34 +0000 | [diff] [blame] | 941 | ProcessMarkingDeque(bytes_to_process); |
danno@chromium.org | 2ab0c3b | 2012-10-05 08:50:56 +0000 | [diff] [blame] | 942 | if (marking_deque_.IsEmpty()) MarkingComplete(action); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 943 | } |
| 944 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 945 | steps_count_++; |
| 946 | steps_count_since_last_gc_++; |
| 947 | |
| 948 | bool speed_up = false; |
| 949 | |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 950 | if ((steps_count_ % kMarkingSpeedAccellerationInterval) == 0) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 951 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 952 | PrintPID("Speed up marking after %d steps\n", |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 953 | static_cast<int>(kMarkingSpeedAccellerationInterval)); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 954 | } |
| 955 | speed_up = true; |
| 956 | } |
| 957 | |
| 958 | bool space_left_is_very_small = |
| 959 | (old_generation_space_available_at_start_of_incremental_ < 10 * MB); |
| 960 | |
| 961 | bool only_1_nth_of_space_that_was_available_still_left = |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 962 | (SpaceLeftInOldSpace() * (marking_speed_ + 1) < |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 963 | old_generation_space_available_at_start_of_incremental_); |
| 964 | |
| 965 | if (space_left_is_very_small || |
| 966 | only_1_nth_of_space_that_was_available_still_left) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 967 | if (FLAG_trace_gc) PrintPID("Speed up marking because of low space left\n"); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 968 | speed_up = true; |
| 969 | } |
| 970 | |
| 971 | bool size_of_old_space_multiplied_by_n_during_marking = |
| 972 | (heap_->PromotedTotalSize() > |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 973 | (marking_speed_ + 1) * |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 974 | old_generation_space_used_at_start_of_incremental_); |
| 975 | if (size_of_old_space_multiplied_by_n_during_marking) { |
| 976 | speed_up = true; |
| 977 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 978 | PrintPID("Speed up marking because of heap size increase\n"); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 979 | } |
| 980 | } |
| 981 | |
| 982 | int64_t promoted_during_marking = heap_->PromotedTotalSize() |
| 983 | - old_generation_space_used_at_start_of_incremental_; |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 984 | intptr_t delay = marking_speed_ * MB; |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 985 | intptr_t scavenge_slack = heap_->MaxSemiSpaceSize(); |
| 986 | |
| 987 | // We try to scan at at least twice the speed that we are allocating. |
| 988 | if (promoted_during_marking > bytes_scanned_ / 2 + scavenge_slack + delay) { |
| 989 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 990 | PrintPID("Speed up marking because marker was not keeping up\n"); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 991 | } |
| 992 | speed_up = true; |
| 993 | } |
| 994 | |
| 995 | if (speed_up) { |
| 996 | if (state_ != MARKING) { |
| 997 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 998 | PrintPID("Postponing speeding up marking until marking starts\n"); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 999 | } |
| 1000 | } else { |
ulan@chromium.org | 57ff881 | 2013-05-10 08:16:55 +0000 | [diff] [blame] | 1001 | marking_speed_ += kMarkingSpeedAccelleration; |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 1002 | marking_speed_ = static_cast<int>( |
| 1003 | Min(kMaxMarkingSpeed, |
| 1004 | static_cast<intptr_t>(marking_speed_ * 1.3))); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 1005 | if (FLAG_trace_gc) { |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 1006 | PrintPID("Marking speed increased to %d\n", marking_speed_); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 1007 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1008 | } |
| 1009 | } |
| 1010 | |
mstarzinger@chromium.org | e3b8d0f | 2013-02-01 09:06:41 +0000 | [diff] [blame] | 1011 | if (FLAG_trace_incremental_marking || FLAG_trace_gc || |
| 1012 | FLAG_print_cumulative_gc_stat) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1013 | double end = OS::TimeCurrentMillis(); |
| 1014 | double delta = (end - start); |
| 1015 | longest_step_ = Max(longest_step_, delta); |
| 1016 | steps_took_ += delta; |
| 1017 | steps_took_since_last_gc_ += delta; |
mstarzinger@chromium.org | e3b8d0f | 2013-02-01 09:06:41 +0000 | [diff] [blame] | 1018 | heap_->AddMarkingTime(delta); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1019 | } |
| 1020 | } |
| 1021 | |
| 1022 | |
| 1023 | void IncrementalMarking::ResetStepCounters() { |
| 1024 | steps_count_ = 0; |
| 1025 | steps_took_ = 0; |
| 1026 | longest_step_ = 0.0; |
| 1027 | old_generation_space_available_at_start_of_incremental_ = |
| 1028 | SpaceLeftInOldSpace(); |
| 1029 | old_generation_space_used_at_start_of_incremental_ = |
| 1030 | heap_->PromotedTotalSize(); |
| 1031 | steps_count_since_last_gc_ = 0; |
| 1032 | steps_took_since_last_gc_ = 0; |
| 1033 | bytes_rescanned_ = 0; |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 1034 | marking_speed_ = kInitialMarkingSpeed; |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 1035 | bytes_scanned_ = 0; |
verwaest@chromium.org | 33e09c8 | 2012-10-10 17:07:22 +0000 | [diff] [blame] | 1036 | write_barriers_invoked_since_last_step_ = 0; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1037 | } |
| 1038 | |
| 1039 | |
| 1040 | int64_t IncrementalMarking::SpaceLeftInOldSpace() { |
jkummerow@chromium.org | 212d964 | 2012-05-11 15:02:09 +0000 | [diff] [blame] | 1041 | return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSizeOfObjects(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1042 | } |
| 1043 | |
| 1044 | } } // namespace v8::internal |