Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_HEAP_INCREMENTAL_MARKING_H_ |
| 6 | #define V8_HEAP_INCREMENTAL_MARKING_H_ |
| 7 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 8 | #include "src/cancelable-task.h" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 9 | #include "src/execution.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 10 | #include "src/heap/incremental-marking-job.h" |
| 11 | #include "src/heap/spaces.h" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 12 | #include "src/objects.h" |
| 13 | |
| 14 | namespace v8 { |
| 15 | namespace internal { |
| 16 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 17 | // Forward declarations. |
| 18 | class MarkBit; |
| 19 | class PagedSpace; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 20 | |
| 21 | class IncrementalMarking { |
| 22 | public: |
| 23 | enum State { STOPPED, SWEEPING, MARKING, COMPLETE }; |
| 24 | |
| 25 | enum CompletionAction { GC_VIA_STACK_GUARD, NO_GC_VIA_STACK_GUARD }; |
| 26 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 27 | enum ForceMarkingAction { FORCE_MARKING, DO_NOT_FORCE_MARKING }; |
| 28 | |
| 29 | enum ForceCompletionAction { FORCE_COMPLETION, DO_NOT_FORCE_COMPLETION }; |
| 30 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 31 | enum GCRequestType { COMPLETE_MARKING, FINALIZATION }; |
| 32 | |
| 33 | struct StepActions { |
| 34 | StepActions(CompletionAction complete_action_, |
| 35 | ForceMarkingAction force_marking_, |
| 36 | ForceCompletionAction force_completion_) |
| 37 | : completion_action(complete_action_), |
| 38 | force_marking(force_marking_), |
| 39 | force_completion(force_completion_) {} |
| 40 | |
| 41 | CompletionAction completion_action; |
| 42 | ForceMarkingAction force_marking; |
| 43 | ForceCompletionAction force_completion; |
| 44 | }; |
| 45 | |
| 46 | static StepActions IdleStepActions(); |
| 47 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 48 | explicit IncrementalMarking(Heap* heap); |
| 49 | |
| 50 | static void Initialize(); |
| 51 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 52 | State state() { |
| 53 | DCHECK(state_ == STOPPED || FLAG_incremental_marking); |
| 54 | return state_; |
| 55 | } |
| 56 | |
| 57 | bool should_hurry() { return should_hurry_; } |
| 58 | void set_should_hurry(bool val) { should_hurry_ = val; } |
| 59 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 60 | bool finalize_marking_completed() const { |
| 61 | return finalize_marking_completed_; |
| 62 | } |
| 63 | |
| 64 | void SetWeakClosureWasOverApproximatedForTesting(bool val) { |
| 65 | finalize_marking_completed_ = val; |
| 66 | } |
| 67 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 68 | inline bool IsStopped() { return state() == STOPPED; } |
| 69 | |
| 70 | INLINE(bool IsMarking()) { return state() >= MARKING; } |
| 71 | |
| 72 | inline bool IsMarkingIncomplete() { return state() == MARKING; } |
| 73 | |
| 74 | inline bool IsComplete() { return state() == COMPLETE; } |
| 75 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 76 | inline bool IsReadyToOverApproximateWeakClosure() const { |
| 77 | return request_type_ == FINALIZATION && !finalize_marking_completed_; |
| 78 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 79 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 80 | GCRequestType request_type() const { return request_type_; } |
| 81 | |
| 82 | bool CanBeActivated(); |
| 83 | |
| 84 | bool ShouldActivateEvenWithoutIdleNotification(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 85 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 86 | bool WasActivated(); |
| 87 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 88 | void Start(const char* reason = nullptr); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 89 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 90 | void FinalizeIncrementally(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 91 | |
| 92 | void UpdateMarkingDequeAfterScavenge(); |
| 93 | |
| 94 | void Hurry(); |
| 95 | |
| 96 | void Finalize(); |
| 97 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 98 | void Stop(); |
| 99 | |
| 100 | void FinalizeMarking(CompletionAction action); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 101 | |
| 102 | void MarkingComplete(CompletionAction action); |
| 103 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 104 | void Epilogue(); |
| 105 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 106 | // Performs incremental marking steps of step_size_in_bytes as long as |
| 107 | // deadline_ins_ms is not reached. step_size_in_bytes can be 0 to compute |
| 108 | // an estimate increment. Returns the remaining time that cannot be used |
| 109 | // for incremental marking anymore because a single step would exceed the |
| 110 | // deadline. |
| 111 | double AdvanceIncrementalMarking(intptr_t step_size_in_bytes, |
| 112 | double deadline_in_ms, |
| 113 | StepActions step_actions); |
| 114 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 115 | // It's hard to know how much work the incremental marker should do to make |
| 116 | // progress in the face of the mutator creating new work for it. We start |
| 117 | // of at a moderate rate of work and gradually increase the speed of the |
| 118 | // incremental marker until it completes. |
| 119 | // Do some marking every time this much memory has been allocated or that many |
| 120 | // heavy (color-checking) write barriers have been invoked. |
| 121 | static const intptr_t kAllocatedThreshold = 65536; |
| 122 | static const intptr_t kWriteBarriersInvokedThreshold = 32768; |
| 123 | // Start off by marking this many times more memory than has been allocated. |
| 124 | static const intptr_t kInitialMarkingSpeed = 1; |
| 125 | // But if we are promoting a lot of data we need to mark faster to keep up |
| 126 | // with the data that is entering the old space through promotion. |
| 127 | static const intptr_t kFastMarking = 3; |
| 128 | // After this many steps we increase the marking/allocating factor. |
| 129 | static const intptr_t kMarkingSpeedAccellerationInterval = 1024; |
| 130 | // This is how much we increase the marking/allocating factor by. |
| 131 | static const intptr_t kMarkingSpeedAccelleration = 2; |
| 132 | static const intptr_t kMaxMarkingSpeed = 1000; |
| 133 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 134 | // This is the upper bound for how many times we allow finalization of |
| 135 | // incremental marking to be postponed. |
| 136 | static const size_t kMaxIdleMarkingDelayCounter = 3; |
| 137 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 138 | void OldSpaceStep(intptr_t allocated); |
| 139 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 140 | intptr_t Step(intptr_t allocated, CompletionAction action, |
| 141 | ForceMarkingAction marking = DO_NOT_FORCE_MARKING, |
| 142 | ForceCompletionAction completion = FORCE_COMPLETION); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 143 | |
| 144 | inline void RestartIfNotMarking() { |
| 145 | if (state_ == COMPLETE) { |
| 146 | state_ = MARKING; |
| 147 | if (FLAG_trace_incremental_marking) { |
| 148 | PrintF("[IncrementalMarking] Restarting (new grey objects)\n"); |
| 149 | } |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | static void RecordWriteFromCode(HeapObject* obj, Object** slot, |
| 154 | Isolate* isolate); |
| 155 | |
| 156 | // Record a slot for compaction. Returns false for objects that are |
| 157 | // guaranteed to be rescanned or not guaranteed to survive. |
| 158 | // |
| 159 | // No slots in white objects should be recorded, as some slots are typed and |
| 160 | // cannot be interpreted correctly if the underlying object does not survive |
| 161 | // the incremental cycle (stays white). |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 162 | INLINE(bool BaseRecordWrite(HeapObject* obj, Object* value)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 163 | INLINE(void RecordWrite(HeapObject* obj, Object** slot, Object* value)); |
| 164 | INLINE(void RecordWriteIntoCode(HeapObject* obj, RelocInfo* rinfo, |
| 165 | Object* value)); |
| 166 | INLINE(void RecordWriteOfCodeEntry(JSFunction* host, Object** slot, |
| 167 | Code* value)); |
| 168 | |
| 169 | |
| 170 | void RecordWriteSlow(HeapObject* obj, Object** slot, Object* value); |
| 171 | void RecordWriteIntoCodeSlow(HeapObject* obj, RelocInfo* rinfo, |
| 172 | Object* value); |
| 173 | void RecordWriteOfCodeEntrySlow(JSFunction* host, Object** slot, Code* value); |
| 174 | void RecordCodeTargetPatch(Code* host, Address pc, HeapObject* value); |
| 175 | void RecordCodeTargetPatch(Address pc, HeapObject* value); |
| 176 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 177 | void RecordWrites(HeapObject* obj); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 178 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 179 | void BlackToGreyAndUnshift(HeapObject* obj, MarkBit mark_bit); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 180 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 181 | void WhiteToGreyAndPush(HeapObject* obj, MarkBit mark_bit); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 182 | |
| 183 | inline void SetOldSpacePageFlags(MemoryChunk* chunk) { |
| 184 | SetOldSpacePageFlags(chunk, IsMarking(), IsCompacting()); |
| 185 | } |
| 186 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 187 | inline void SetNewSpacePageFlags(MemoryChunk* chunk) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 188 | SetNewSpacePageFlags(chunk, IsMarking()); |
| 189 | } |
| 190 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 191 | bool IsCompacting() { return IsMarking() && is_compacting_; } |
| 192 | |
| 193 | void ActivateGeneratedStub(Code* stub); |
| 194 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 195 | void NotifyOfHighPromotionRate(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 196 | |
| 197 | void EnterNoMarkingScope() { no_marking_scope_depth_++; } |
| 198 | |
| 199 | void LeaveNoMarkingScope() { no_marking_scope_depth_--; } |
| 200 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 201 | void NotifyIncompleteScanOfObject(int unscanned_bytes) { |
| 202 | unscanned_bytes_of_large_object_ = unscanned_bytes; |
| 203 | } |
| 204 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 205 | void ClearIdleMarkingDelayCounter(); |
| 206 | |
| 207 | bool IsIdleMarkingDelayCounterLimitReached(); |
| 208 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 209 | INLINE(static void MarkObject(Heap* heap, HeapObject* object)); |
| 210 | |
| 211 | Heap* heap() const { return heap_; } |
| 212 | |
| 213 | IncrementalMarkingJob* incremental_marking_job() { |
| 214 | return &incremental_marking_job_; |
| 215 | } |
| 216 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 217 | private: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 218 | class Observer : public InlineAllocationObserver { |
| 219 | public: |
| 220 | Observer(IncrementalMarking& incremental_marking, intptr_t step_size) |
| 221 | : InlineAllocationObserver(step_size), |
| 222 | incremental_marking_(incremental_marking) {} |
| 223 | |
| 224 | void Step(int bytes_allocated, Address, size_t) override { |
| 225 | incremental_marking_.Step(bytes_allocated, |
| 226 | IncrementalMarking::GC_VIA_STACK_GUARD); |
| 227 | } |
| 228 | |
| 229 | private: |
| 230 | IncrementalMarking& incremental_marking_; |
| 231 | }; |
| 232 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 233 | int64_t SpaceLeftInOldSpace(); |
| 234 | |
| 235 | void SpeedUp(); |
| 236 | |
| 237 | void ResetStepCounters(); |
| 238 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 239 | void StartMarking(); |
| 240 | |
| 241 | void MarkRoots(); |
| 242 | void MarkObjectGroups(); |
| 243 | void ProcessWeakCells(); |
| 244 | // Retain dying maps for <FLAG_retain_maps_for_n_gc> garbage collections to |
| 245 | // increase chances of reusing of map transition tree in future. |
| 246 | void RetainMaps(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 247 | |
| 248 | void ActivateIncrementalWriteBarrier(PagedSpace* space); |
| 249 | static void ActivateIncrementalWriteBarrier(NewSpace* space); |
| 250 | void ActivateIncrementalWriteBarrier(); |
| 251 | |
| 252 | static void DeactivateIncrementalWriteBarrierForSpace(PagedSpace* space); |
| 253 | static void DeactivateIncrementalWriteBarrierForSpace(NewSpace* space); |
| 254 | void DeactivateIncrementalWriteBarrier(); |
| 255 | |
| 256 | static void SetOldSpacePageFlags(MemoryChunk* chunk, bool is_marking, |
| 257 | bool is_compacting); |
| 258 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 259 | static void SetNewSpacePageFlags(MemoryChunk* chunk, bool is_marking); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 260 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 261 | INLINE(void ProcessMarkingDeque()); |
| 262 | |
| 263 | INLINE(intptr_t ProcessMarkingDeque(intptr_t bytes_to_process)); |
| 264 | |
| 265 | INLINE(void VisitObject(Map* map, HeapObject* obj, int size)); |
| 266 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 267 | void IncrementIdleMarkingDelayCounter(); |
| 268 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 269 | Heap* heap_; |
| 270 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 271 | Observer observer_; |
| 272 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 273 | State state_; |
| 274 | bool is_compacting_; |
| 275 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 276 | int steps_count_; |
| 277 | int64_t old_generation_space_available_at_start_of_incremental_; |
| 278 | int64_t old_generation_space_used_at_start_of_incremental_; |
| 279 | int64_t bytes_rescanned_; |
| 280 | bool should_hurry_; |
| 281 | int marking_speed_; |
| 282 | intptr_t bytes_scanned_; |
| 283 | intptr_t allocated_; |
| 284 | intptr_t write_barriers_invoked_since_last_step_; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 285 | size_t idle_marking_delay_counter_; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 286 | |
| 287 | int no_marking_scope_depth_; |
| 288 | |
| 289 | int unscanned_bytes_of_large_object_; |
| 290 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 291 | bool was_activated_; |
| 292 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 293 | bool finalize_marking_completed_; |
| 294 | |
| 295 | int incremental_marking_finalization_rounds_; |
| 296 | |
| 297 | GCRequestType request_type_; |
| 298 | |
| 299 | IncrementalMarkingJob incremental_marking_job_; |
| 300 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 301 | DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking); |
| 302 | }; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 303 | } // namespace internal |
| 304 | } // namespace v8 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 305 | |
| 306 | #endif // V8_HEAP_INCREMENTAL_MARKING_H_ |