12faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes/* 22faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * Copyright (C) 2011 The Android Open Source Project 32faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * 42faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * Licensed under the Apache License, Version 2.0 (the "License"); 52faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * you may not use this file except in compliance with the License. 62faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * You may obtain a copy of the License at 72faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * 82faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * http://www.apache.org/licenses/LICENSE-2.0 92faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * 102faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * Unless required by applicable law or agreed to in writing, software 112faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * distributed under the License is distributed on an "AS IS" BASIS, 122faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 132faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * See the License for the specific language governing permissions and 142faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes * limitations under the License. 152faa5f1271587cda765f26bcf2951065300a01ffElliott Hughes */ 1669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 17578bbdc684db8ed68e9fedbc678669d27fa68b6eBrian Carlstrom#include "mark_sweep.h" 1869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 19c7df66e2cb124d261cf3b0691a09a3b6e357b6f1Yabin Cui#include <atomic> 202b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier#include <functional> 212b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier#include <numeric> 2258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro#include <climits> 2358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro#include <vector> 2458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 2594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier#include "base/bounded_fifo.h" 2607ed66b5ae659c452cbe1ab20c3dbf1d6f546461Elliott Hughes#include "base/logging.h" 27761600567d73b23324ae0251e871c15d6849ffd8Elliott Hughes#include "base/macros.h" 28693ff61274cd2c9b8eb7e68c370f84a911b8ca52Ian Rogers#include "base/mutex-inl.h" 29dabdc0fe183d4684f3cf4d70cb09d318cff81b42Mathieu Chartier#include "base/systrace.h" 3080afd02024d20e60b197d3adfbb43cc303cf29e0Vladimir Marko#include "base/time_utils.h" 31a84395489098e4531619b1cffd1afc282b14510eSameer Abu Asal#include "base/timing_logger.h" 321d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/accounting/card_table-inl.h" 334aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier#include "gc/accounting/heap_bitmap-inl.h" 3411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier#include "gc/accounting/mod_union_table.h" 351d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/accounting/space_bitmap-inl.h" 361d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/heap.h" 3778f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier#include "gc/reference_processor.h" 381d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/large_object_space.h" 391d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/space-inl.h" 402dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mark_sweep-inl.h" 412dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object-inl.h" 421f87008b165d26541d832ff805250afdc89c253dBrian Carlstrom#include "runtime.h" 434aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier#include "scoped_thread_state_change.h" 441d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "thread-inl.h" 456f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier#include "thread_list.h" 4669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 4769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapironamespace art { 481d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace gc { 491d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace collector { 5069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 5102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Performance options. 52eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseRecursiveMark = false; 53eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseMarkStackPrefetch = true; 54eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kSweepArrayChunkFreeSize = 1024; 55eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kPreCleanCards = true; 5694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 5794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Parallelism options. 58eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelCardScan = true; 59eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelRecursiveMark = true; 6094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Don't attempt to parallelize mark stack processing unless the mark stack is at least n 6194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// elements. This is temporary until we reduce the overhead caused by allocating tasks, etc.. Not 6294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// having this can add overhead in ProcessReferences since we may end up doing many calls of 6394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// ProcessMarkStack with very small mark stacks. 64eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kMinimumParallelMarkStackSize = 128; 65eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelProcessMarkStack = true; 66858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 6702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Profiling and information flags. 68eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kProfileLargeObjects = false; 69eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kMeasureOverhead = false; 70eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCountTasks = false; 710e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierstatic constexpr bool kCountMarkedObjects = false; 7294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 7394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Turn off kCheckLocks when profiling the GC since it slows the GC down by up to 40%. 74eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCheckLocks = kDebugLocking; 757bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartierstatic constexpr bool kVerifyRootsMarked = kIsDebugBuild; 7602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 77c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// If true, revoke the rosalloc thread-local buffers at the 78c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// checkpoint, as opposed to during the pause. 79c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchistatic constexpr bool kRevokeRosAllocThreadLocalBuffersAtCheckpoint = true; 80c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::BindBitmaps() { 82f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 842b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Mark all of the spaces we never collect as immune. 8594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 861d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyNeverCollect) { 87763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier immune_spaces_.AddSpace(space); 882b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 921d54e73444e017d3a65234e0f193846f3e27472bIan RogersMarkSweep::MarkSweep(Heap* heap, bool is_concurrent, const std::string& name_prefix) 931d54e73444e017d3a65234e0f193846f3e27472bIan Rogers : GarbageCollector(heap, 94590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier name_prefix + 951d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (is_concurrent ? "concurrent mark sweep": "mark sweep")), 961ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier current_space_bitmap_(nullptr), 971ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_bitmap_(nullptr), 981ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_stack_(nullptr), 9935883cc623fdf475a4ead1dafcba9e9becc1ed11Mathieu Chartier gc_barrier_(new Barrier(0)), 100958291c7afe723d846a39539fd00410c102485f3Mathieu Chartier mark_stack_lock_("mark sweep mark stack lock", kMarkSweepMarkStackLock), 1011ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier is_concurrent_(is_concurrent), 1021ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier live_stack_freeze_size_(0) { 103bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi std::string error_msg; 104bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi MemMap* mem_map = MemMap::MapAnonymous( 105bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi "mark sweep sweep array free buffer", nullptr, 106bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi RoundUp(kSweepArrayChunkFreeSize * sizeof(mirror::Object*), kPageSize), 1075c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko PROT_READ | PROT_WRITE, false, false, &error_msg); 108bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi CHECK(mem_map != nullptr) << "Couldn't allocate sweep array free buffer: " << error_msg; 109bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi sweep_array_free_buffer_mem_map_.reset(mem_map); 1105301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier} 111b3bd5f07884f5a1f2b84224363b1372d7c28d447Elliott Hughes 1122b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::InitializePhase() { 113f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 114eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier mark_stack_ = heap_->GetMarkStack(); 115e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier DCHECK(mark_stack_ != nullptr); 116763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier immune_spaces_.Reset(); 11752a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier no_reference_class_count_.StoreRelaxed(0); 11852a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier normal_count_.StoreRelaxed(0); 1193e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers class_count_.StoreRelaxed(0); 12052a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier object_array_count_.StoreRelaxed(0); 1213e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers other_count_.StoreRelaxed(0); 12252a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier reference_count_.StoreRelaxed(0); 1233e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers large_object_test_.StoreRelaxed(0); 1243e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers large_object_mark_.StoreRelaxed(0); 1253e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers overhead_time_ .StoreRelaxed(0); 1263e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_created_.StoreRelaxed(0); 1273e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_deleted_.StoreRelaxed(0); 1283e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_null_count_.StoreRelaxed(0); 1293e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_immune_count_.StoreRelaxed(0); 1303e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_fastpath_count_.StoreRelaxed(0); 1313e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_slowpath_count_.StoreRelaxed(0); 1320e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier { 133eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier // TODO: I don't think we should need heap bitmap lock to Get the mark bitmap. 1340e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 1350e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_bitmap_ = heap_->GetMarkBitmap(); 1360e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 13710fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier if (!GetCurrentIteration()->GetClearSoftReferences()) { 138df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi // Always clear soft references if a non-sticky collection. 13910fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier GetCurrentIteration()->SetClearSoftReferences(GetGcType() != collector::kGcTypeSticky); 140df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi } 1416f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier} 1426f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier 1436f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartiervoid MarkSweep::RunPhases() { 1446f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Thread* self = Thread::Current(); 1456f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier InitializePhase(); 1466f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Locks::mutator_lock_->AssertNotHeld(self); 1476f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier if (IsConcurrent()) { 1486f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerification(this); 1496f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1506f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1516f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1526f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1536f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1546f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1556f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1566f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1576f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } else { 1586f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1596f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerificationPaused(this); 1606f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1616f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1626f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1636f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1646f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1656f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1666f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Sweeping always done concurrently, even for non concurrent mark sweep. 1676f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1686f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReclaimPhase(); 1696f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1706f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PostGcVerification(this); 1716f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier FinishPhase(); 1722b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1732b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1742b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ProcessReferences(Thread* self) { 1758e56c7e41cb37e2eaf553503968a01ff893b135bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 17678f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->ProcessReferences( 1771ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier true, 1781ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier GetTimings(), 1791ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier GetCurrentIteration()->GetClearSoftReferences(), 1801ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier this); 1811ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier} 1821ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier 1830f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::PausePhase() { 184f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t("(Paused)PausePhase", GetTimings()); 1852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 1862b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 1870f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (IsConcurrent()) { 1880f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Handle the dirty objects if we are a concurrent GC. 1892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Re-mark root set. 1912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ReMarkRoots(); 1922b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Scan dirty objects, this is only required if we are not doing concurrent GC. 19394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkDirtyObjects(true, accounting::CardTable::kCardDirty); 1942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1950f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier { 196f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t2("SwapStacks", GetTimings()); 1972b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 198a4f6af9b1e6380b31674d7ac645b1732c846ac06Mathieu Chartier heap_->SwapStacks(); 1990f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier live_stack_freeze_size_ = heap_->GetLiveStack()->Size(); 2000f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Need to revoke all the thread local allocation stacks since we just swapped the allocation 2010f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // stacks and don't want anybody to allocate into the live stack. 202c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 2032b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 2040f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier heap_->PreSweepingGcVerification(this); 2056f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Disallow new system weaks to prevent a race which occurs when someone adds a new system 2066f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // weak before we sweep them. Since this new system weak may not be marked, the GC may 2076f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // incorrectly sweep it. This also fixes a race where interning may attempt to return a strong 2086f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // reference to a string that is about to be swept. 2096f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Runtime::Current()->DisallowNewSystemWeaks(); 21078f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Enable the reference processing slow path, needs to be done with mutators paused since there 21178f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // is no lock in the GetReferent fast path. 21278f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->EnableSlowPath(); 2132b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2142b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 215dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartiervoid MarkSweep::PreCleanCards() { 216dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Don't do this for non concurrent GCs since they don't have any dirty cards. 217dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier if (kPreCleanCards && IsConcurrent()) { 218f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 219dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier Thread* self = Thread::Current(); 220dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier CHECK(!Locks::mutator_lock_->IsExclusiveHeld(self)); 221dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process dirty cards and add dirty cards to mod union tables, also ages cards. 2224add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li heap_->ProcessCards(GetTimings(), false, true, false); 223eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The checkpoint root marking is required to avoid a race condition which occurs if the 224eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // following happens during a reference write: 225eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 1. mutator dirties the card (write barrier) 226eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 2. GC ages the card (the above ProcessCards call) 227eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 3. GC scans the object (the RecursiveMarkDirtyObjects call below) 228eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 4. mutator writes the value (corresponding to the write barrier in 1.) 229eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // This causes the GC to age the card but not necessarily mark the reference which the mutator 230eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // wrote into the object stored in the card. 231eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // Having the checkpoint fixes this issue since it ensures that the card mark and the 232eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // reference write are visible to the GC before the card is scanned (this is due to locks being 233eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // acquired / released in the checkpoint code). 234eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The other roots are also marked to help reduce the pause. 2350f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, false); 236dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier MarkNonThreadRoots(); 237893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 238893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagClearRootLog | kVisitRootFlagNewRoots)); 239dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process the newly aged cards. 240dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier RecursiveMarkDirtyObjects(false, accounting::CardTable::kCardDirty - 1); 241dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // TODO: Empty allocation stack to reduce the number of objects we need to test / mark as live 242dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // in the next GC. 243dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier } 244dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier} 245dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier 246c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartiervoid MarkSweep::RevokeAllThreadLocalAllocationStacks(Thread* self) { 247c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier if (kUseThreadLocalAllocationStack) { 248f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 249c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 250c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier heap_->RevokeAllThreadLocalAllocationStacks(self); 251c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier } 252c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier} 253c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier 2542b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkingPhase() { 255f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 2562b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 2572b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier BindBitmaps(); 2580e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier FindDefaultSpaceBitmap(); 2592b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Process dirty cards and add dirty cards to mod union tables. 2604add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li // If the GC type is non sticky, then we just clear the cards instead of ageing them. 2614add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li heap_->ProcessCards(GetTimings(), false, true, GetGcType() != kGcTypeSticky); 2622b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 263893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkRoots(self); 2642b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkReachableObjects(); 265dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Pre-clean dirtied cards to reduce pauses. 266dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier PreCleanCards(); 2672b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2682b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 269763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartierclass ScanObjectVisitor { 270763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier public: 271763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier explicit ScanObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE 272763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier : mark_sweep_(mark_sweep) {} 273763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier 274763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier void operator()(mirror::Object* obj) const 275763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier ALWAYS_INLINE 276763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 277763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 278763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier if (kCheckLocks) { 279763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 280763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 281763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier } 282763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier mark_sweep_->ScanObject(obj); 283763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier } 284763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier 285763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier private: 286763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier MarkSweep* const mark_sweep_; 287763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier}; 288763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier 28911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartiervoid MarkSweep::UpdateAndMarkModUnion() { 290763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier for (const auto& space : immune_spaces_.GetSpaces()) { 291763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier const char* name = space->IsZygoteSpace() 292763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier ? "UpdateAndMarkZygoteModUnionTable" 293763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier : "UpdateAndMarkImageModUnionTable"; 294763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier DCHECK(space->IsZygoteSpace() || space->IsImageSpace()) << *space; 295763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier TimingLogger::ScopedTiming t(name, GetTimings()); 296763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier accounting::ModUnionTable* mod_union_table = heap_->FindModUnionTableFromSpace(space); 297763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier if (mod_union_table != nullptr) { 29897509954404d031594b2ecbda607314d169d512eMathieu Chartier mod_union_table->UpdateAndMarkReferences(this); 299763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier } else { 300763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier // No mod-union table, scan all the live bits. This can only occur for app images. 301763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier space->GetLiveBitmap()->VisitMarkedRange(reinterpret_cast<uintptr_t>(space->Begin()), 302763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier reinterpret_cast<uintptr_t>(space->End()), 303763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier ScanObjectVisitor(this)); 30411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 30511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 30611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier} 30711409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier 3082b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkReachableObjects() { 3094aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier UpdateAndMarkModUnion(); 3102b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Recursively mark all the non-image bits set in the mark bitmap. 3112b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier RecursiveMark(); 3122b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 3132b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3142b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ReclaimPhase() { 315f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 316951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier Thread* const self = Thread::Current(); 31778f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Process the references concurrently. 31878f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier ProcessReferences(self); 3190f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier SweepSystemWeaks(self); 320951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier Runtime* const runtime = Runtime::Current(); 321951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier runtime->AllowNewSystemWeaks(); 322951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier // Clean up class loaders after system weaks are swept since that is how we know if class 323951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier // unloading occurred. 324951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier runtime->GetClassLinker()->CleanupClassLoaders(); 3252b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier { 3262b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 3274460a84be92b5a94ecfb5c650aef4945ab849c93Hiroshi Yamauchi GetHeap()->RecordFreeRevoke(); 3282b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Reclaim unmarked objects. 3291d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Sweep(false); 3302b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Swap the live and mark bitmaps for each space which we modified space. This is an 3312b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // optimization that enables us to not clear live bits inside of the sweep. Only swaps unbound 3322b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // bitmaps. 3332b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SwapBitmaps(); 3342b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Unbind the live and mark bitmaps. 335a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier GetHeap()->UnBindBitmaps(); 3362b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 3372b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 3382b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3390e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartiervoid MarkSweep::FindDefaultSpaceBitmap() { 340f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 34102e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 342a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap = space->GetMarkBitmap(); 343bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // We want to have the main space instead of non moving if possible. 344590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (bitmap != nullptr && 345590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) { 3460e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = bitmap; 347bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // If we are not the non moving space exit the loop early since this will be good enough. 348bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (space != heap_->GetNonMovingSpace()) { 349bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier break; 350bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 351b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 352b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 3534c13a3ff475f206c4d0a86ee2595c45392fd942fMathieu Chartier CHECK(current_space_bitmap_ != nullptr) << "Could not find a default mark bitmap\n" 3544c13a3ff475f206c4d0a86ee2595c45392fd942fMathieu Chartier << heap_->DumpSpaces(); 35558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 35658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 357ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartiervoid MarkSweep::ExpandMarkStack() { 358ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier ResizeMarkStack(mark_stack_->Capacity() * 2); 359ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier} 360ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier 361ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartiervoid MarkSweep::ResizeMarkStack(size_t new_size) { 362ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Rare case, no need to have Thread::Current be a parameter. 363ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (UNLIKELY(mark_stack_->Size() < mark_stack_->Capacity())) { 364ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Someone else acquired the lock and expanded the mark stack before us. 365ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier return; 366ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 36797509954404d031594b2ecbda607314d169d512eMathieu Chartier std::vector<StackReference<mirror::Object>> temp(mark_stack_->Begin(), mark_stack_->End()); 368ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier CHECK_LE(mark_stack_->Size(), new_size); 369ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier mark_stack_->Resize(new_size); 370cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier for (auto& obj : temp) { 371cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier mark_stack_->PushBack(obj.AsMirrorPtr()); 372ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 373ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 374ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 375e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartiermirror::Object* MarkSweep::MarkObject(mirror::Object* obj) { 376e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier MarkObject(obj, nullptr, MemberOffset(0)); 377e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier return obj; 378e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier} 379e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier 38097509954404d031594b2ecbda607314d169d512eMathieu Chartierinline void MarkSweep::MarkObjectNonNullParallel(mirror::Object* obj) { 381bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(obj != nullptr); 382ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (MarkObjectParallel(obj)) { 383ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 384ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 385184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier ExpandMarkStack(); 386ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 387ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier // The object must be pushed on to the mark stack. 3880e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 389ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 390ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 391ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 39297509954404d031594b2ecbda607314d169d512eMathieu Chartierbool MarkSweep::IsMarkedHeapReference(mirror::HeapReference<mirror::Object>* ref) { 39397509954404d031594b2ecbda607314d169d512eMathieu Chartier return IsMarked(ref->AsMirrorPtr()); 394308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier} 395308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier 396bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartierclass MarkSweepMarkObjectSlowPath { 397bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier public: 3981ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier explicit MarkSweepMarkObjectSlowPath(MarkSweep* mark_sweep, 3991ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mirror::Object* holder = nullptr, 400eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MemberOffset offset = MemberOffset(0)) 4011ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier : mark_sweep_(mark_sweep), holder_(holder), offset_(offset) {} 402bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 403da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void operator()(const mirror::Object* obj) const NO_THREAD_SAFETY_ANALYSIS { 404bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kProfileLargeObjects) { 405bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: Differentiate between marking and testing somehow. 406bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_test_; 407bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_mark_; 408bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 409bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier space::LargeObjectSpace* large_object_space = mark_sweep_->GetHeap()->GetLargeObjectsSpace(); 410a17288e3b9dd6751005fed3386251d2d0949be74Mathieu Chartier if (UNLIKELY(obj == nullptr || !IsAligned<kPageSize>(obj) || 4112dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier (kIsDebugBuild && large_object_space != nullptr && 4122dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier !large_object_space->Contains(obj)))) { 413175746ac9039e9b741d3521420dcaa9c59341738Mathieu Chartier LOG(INTERNAL_FATAL) << "Tried to mark " << obj << " not contained by any spaces"; 414eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi if (holder_ != nullptr) { 415d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi size_t holder_size = holder_->SizeOf(); 416eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi ArtField* field = holder_->FindFieldByOffset(offset_); 417d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi LOG(INTERNAL_FATAL) << "Field info: " 418d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " holder=" << holder_ 419679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << " holder is " 420679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << (mark_sweep_->GetHeap()->IsLiveObjectLocked(holder_) 421679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi ? "alive" : "dead") 422d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " holder_size=" << holder_size 423eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi << " holder_type=" << PrettyTypeOf(holder_) 424eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi << " offset=" << offset_.Uint32Value() 425d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " field=" << (field != nullptr ? field->GetName() : "nullptr") 426d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " field_type=" 427d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (field != nullptr ? field->GetTypeDescriptor() : "") 428d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " first_ref_field_offset=" 429d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (holder_->IsClass() 430e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier ? holder_->AsClass()->GetFirstReferenceStaticFieldOffset( 431e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier sizeof(void*)) 432d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi : holder_->GetClass()->GetFirstReferenceInstanceFieldOffset()) 433d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " num_of_ref_fields=" 434d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (holder_->IsClass() 435d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi ? holder_->AsClass()->NumReferenceStaticFields() 436d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi : holder_->GetClass()->NumReferenceInstanceFields()) 437d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << "\n"; 438679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi // Print the memory content of the holder. 439679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi for (size_t i = 0; i < holder_size / sizeof(uint32_t); ++i) { 440679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi uint32_t* p = reinterpret_cast<uint32_t*>(holder_); 441679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi LOG(INTERNAL_FATAL) << &p[i] << ": " << "holder+" << (i * sizeof(uint32_t)) << " = " 442679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << std::hex << p[i]; 443679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi } 444eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi } 445d38ec80b163af1639fbaae382a319c73be67c560Hiroshi Yamauchi PrintFileToLog("/proc/self/maps", LogSeverity::INTERNAL_FATAL); 44617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko MemMap::DumpMaps(LOG(INTERNAL_FATAL), true); 447d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi { 448d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi LOG(INTERNAL_FATAL) << "Attempting see if it's a bad root"; 449d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Thread* self = Thread::Current(); 450d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 451d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi mark_sweep_->VerifyRoots(); 452d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } else { 453d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi const bool heap_bitmap_exclusive_locked = 454d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->IsExclusiveHeld(self); 455d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (heap_bitmap_exclusive_locked) { 456d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 457d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 4584f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier { 4594f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier ScopedThreadSuspension(self, kSuspended); 4604f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier ScopedSuspendAll ssa(__FUNCTION__); 4614f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier mark_sweep_->VerifyRoots(); 4624f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier } 463d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (heap_bitmap_exclusive_locked) { 464d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->ExclusiveLock(self); 465d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 466d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 467d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 468bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(FATAL) << "Can't mark invalid object"; 469bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 470bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 471bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 472bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier private: 473bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweep* const mark_sweep_; 474eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi mirror::Object* const holder_; 475eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MemberOffset offset_; 476bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier}; 477bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 4781ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartierinline void MarkSweep::MarkObjectNonNull(mirror::Object* obj, 4791ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mirror::Object* holder, 48097509954404d031594b2ecbda607314d169d512eMathieu Chartier MemberOffset offset) { 4810e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 482624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 483624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 484624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 4859d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 486763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier if (immune_spaces_.IsInImmuneRegion(obj)) { 4870e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4880e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_immune_count_; 4890e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 490bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(mark_bitmap_->Test(obj)); 491bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else if (LIKELY(current_space_bitmap_->HasAddress(obj))) { 492bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kCountMarkedObjects) { 493bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_fastpath_count_; 494bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 495bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (UNLIKELY(!current_space_bitmap_->Set(obj))) { 496bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // This object was not previously marked. 497bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 498bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else { 4990e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 5000e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_slowpath_count_; 5010e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 502eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MarkSweepMarkObjectSlowPath visitor(this, holder, offset); 503bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: We already know that the object is not in the current_space_bitmap_ but MarkBitmap::Set 504bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // will check again. 505bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (!mark_bitmap_->Set(obj, visitor)) { 506bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // Was not already marked, push. 507357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 5080e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 5090e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier} 5100e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier 51197509954404d031594b2ecbda607314d169d512eMathieu Chartierinline void MarkSweep::PushOnMarkStack(mirror::Object* obj) { 5120e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 5130e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // Lock is not needed but is here anyways to please annotalysis. 5140e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 5150e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ExpandMarkStack(); 51669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 5170e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // The object must be pushed on to the mark stack. 5180e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 51969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 52069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 52197509954404d031594b2ecbda607314d169d512eMathieu Chartierinline bool MarkSweep::MarkObjectParallel(mirror::Object* obj) { 5220e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 523624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 524624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 525624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 5269d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 527763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier if (immune_spaces_.IsInImmuneRegion(obj)) { 52897509954404d031594b2ecbda607314d169d512eMathieu Chartier DCHECK(IsMarked(obj) != nullptr); 52902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 53002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 53102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 53202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // the hard way. 533a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* object_bitmap = current_space_bitmap_; 534bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (LIKELY(object_bitmap->HasAddress(obj))) { 535bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !object_bitmap->AtomicTestAndSet(obj); 53602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 537bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweepMarkObjectSlowPath visitor(this); 538bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !mark_bitmap_->AtomicTestAndSet(obj, visitor); 53902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 54002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 54197509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::MarkHeapReference(mirror::HeapReference<mirror::Object>* ref) { 54297509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkObject(ref->AsMirrorPtr(), nullptr, MemberOffset(0)); 54397509954404d031594b2ecbda607314d169d512eMathieu Chartier} 54497509954404d031594b2ecbda607314d169d512eMathieu Chartier 5450e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier// Used to mark objects when processing the mark stack. If an object is null, it is not marked. 5461ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartierinline void MarkSweep::MarkObject(mirror::Object* obj, 5471ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mirror::Object* holder, 54897509954404d031594b2ecbda607314d169d512eMathieu Chartier MemberOffset offset) { 5490e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (obj != nullptr) { 550eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MarkObjectNonNull(obj, holder, offset); 5510e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } else if (kCountMarkedObjects) { 5520e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_null_count_; 55369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 55469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 55569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 556bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass VerifyRootMarkedVisitor : public SingleRootVisitor { 557bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier public: 558bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier explicit VerifyRootMarkedVisitor(MarkSweep* collector) : collector_(collector) { } 559ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 560bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE 56190443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 56297509954404d031594b2ecbda607314d169d512eMathieu Chartier CHECK(collector_->IsMarked(root) != nullptr) << info.ToString(); 563bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 564bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 565bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier private: 566bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkSweep* const collector_; 567bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier}; 568893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier 5691ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartiervoid MarkSweep::VisitRoots(mirror::Object*** roots, 5701ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t count, 571bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) { 572bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 573bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkObjectNonNull(*roots[i]); 574bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 575815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier} 576815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier 5771ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartiervoid MarkSweep::VisitRoots(mirror::CompressedReference<mirror::Object>** roots, 5781ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t count, 579bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) { 580bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 581bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkObjectNonNull(roots[i]->AsMirrorPtr()); 582bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 5836f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5846f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 585bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass VerifyRootVisitor : public SingleRootVisitor { 586bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier public: 587bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE 58890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 5899086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier // See if the root is on any space bitmap. 5909086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier auto* heap = Runtime::Current()->GetHeap(); 5919086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier if (heap->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == nullptr) { 5929086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier space::LargeObjectSpace* large_object_space = heap->GetLargeObjectsSpace(); 5939086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier if (large_object_space != nullptr && !large_object_space->Contains(root)) { 594175746ac9039e9b741d3521420dcaa9c59341738Mathieu Chartier LOG(INTERNAL_FATAL) << "Found invalid root: " << root << " " << info; 5959086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier } 5966f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5976f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5989086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier}; 5996f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 6006f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRoots() { 6019086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier VerifyRootVisitor visitor; 602bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->GetThreadList()->VisitRoots(&visitor); 6036f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 6046f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 605893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkRoots(Thread* self) { 606f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 607893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 608893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // If we exclusively hold the mutator lock, all threads must be suspended. 609bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(this); 610893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 611893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } else { 6120f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, kRevokeRosAllocThreadLocalBuffersAtCheckpoint); 613893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // At this point the live stack should no longer have any mutators which push into it. 614893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkNonThreadRoots(); 615893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 616893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagAllRoots | kVisitRootFlagStartLoggingNewRoots)); 617893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 6189ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier} 6199ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier 620858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartiervoid MarkSweep::MarkNonThreadRoots() { 621f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 622bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitNonThreadRoots(this); 623858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 624858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 625893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkConcurrentRoots(VisitRootFlags flags) { 626f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 6271d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Visit all runtime roots and clear dirty flags. 6284edd8476339fd93ba8ff384ad107f1fc662e64a3Mathieu Chartier Runtime::Current()->VisitConcurrentRoots( 6294edd8476339fd93ba8ff384ad107f1fc662e64a3Mathieu Chartier this, static_cast<VisitRootFlags>(flags | kVisitRootFlagNonMoving)); 63069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 63169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 632407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartierclass DelayReferenceReferentVisitor { 633407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 6341ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier explicit DelayReferenceReferentVisitor(MarkSweep* collector) : collector_(collector) {} 635407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 636407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(mirror::Class* klass, mirror::Reference* ref) const 6371ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 6381ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 639407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier collector_->DelayReferenceReferent(klass, ref); 640407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 641407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 642407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 643407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const collector_; 644407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier}; 645407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 64694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiertemplate <bool kUseFinger = false> 64794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass MarkStackTask : public Task { 64894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 6491ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MarkStackTask(ThreadPool* thread_pool, 6501ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MarkSweep* mark_sweep, 6511ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t mark_stack_size, 65297509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack) 65394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep), 65494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_(thread_pool), 65594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_(mark_stack_size) { 65694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We may have to copy part of an existing mark stack when another mark stack overflows. 65794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_size != 0) { 6582cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier DCHECK(mark_stack != nullptr); 65994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Check performance? 66094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier std::copy(mark_stack, mark_stack + mark_stack_size, mark_stack_); 66194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 66294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 66394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_created_; 6641d54e73444e017d3a65234e0f193846f3e27472bIan Rogers } 665262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier } 666262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 66794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kMaxSize = 1 * KB; 668cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 66994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 670407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier class MarkObjectParallelVisitor { 671407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 6723887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain ALWAYS_INLINE MarkObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task, 6733887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain MarkSweep* mark_sweep) 674da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier : chunk_task_(chunk_task), mark_sweep_(mark_sweep) {} 675da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 6761ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE void operator()(mirror::Object* obj, 6771ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MemberOffset offset, 6781ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier bool is_static ATTRIBUTE_UNUSED) const 6791ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 680da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Mark(obj->GetFieldObject<mirror::Object>(offset)); 681da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 682407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 683da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const 68490443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 685da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (!root->IsNull()) { 686da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier VisitRoot(root); 687da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 688da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 689da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 690da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const 691da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 692da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (kCheckLocks) { 693da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 694da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 695da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 696da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Mark(root->AsMirrorPtr()); 697da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 698da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 699da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier private: 7001ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE void Mark(mirror::Object* ref) const SHARED_REQUIRES(Locks::mutator_lock_) { 701407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (ref != nullptr && mark_sweep_->MarkObjectParallel(ref)) { 702407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (kUseFinger) { 703c7df66e2cb124d261cf3b0691a09a3b6e357b6f1Yabin Cui std::atomic_thread_fence(std::memory_order_seq_cst); 704407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (reinterpret_cast<uintptr_t>(ref) >= 7053e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers static_cast<uintptr_t>(mark_sweep_->atomic_finger_.LoadRelaxed())) { 706407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier return; 707407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 708407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 709407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier chunk_task_->MarkStackPush(ref); 710407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 711407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 712407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 713407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 714407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep_; 715407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier }; 716407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 71794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier class ScanObjectParallelVisitor { 71894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 7191ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE explicit ScanObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task) 72094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : chunk_task_(chunk_task) {} 72194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 722407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier // No thread safety analysis since multiple threads will use this visitor. 7231ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier void operator()(mirror::Object* obj) const 7241ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 7251ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 726407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep = chunk_task_->mark_sweep_; 727407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectParallelVisitor mark_visitor(chunk_task_, mark_sweep); 728407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(mark_sweep); 729407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mark_sweep->ScanObjectVisit(obj, mark_visitor, ref_visitor); 73094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 73194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 73294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier private: 73394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 73494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier }; 73594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 73694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual ~MarkStackTask() { 73794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Make sure that we have cleared our mark stack. 73894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_EQ(mark_stack_pos_, 0U); 73994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 74094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_deleted_; 7412b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 742cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 743cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 74494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkSweep* const mark_sweep_; 74594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* const thread_pool_; 74694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Thread local mark stack for this task. 74797509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object> mark_stack_[kMaxSize]; 74894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack position. 74994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_pos_; 75094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 75197509954404d031594b2ecbda607314d169d512eMathieu Chartier ALWAYS_INLINE void MarkStackPush(mirror::Object* obj) 75290443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 75394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == kMaxSize)) { 75494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack overflow, give 1/2 the stack to the thread pool as a new work task. 75594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_ /= 2; 7561ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier auto* task = new MarkStackTask(thread_pool_, 7571ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_sweep_, 7581ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier kMaxSize - mark_stack_pos_, 75994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_ + mark_stack_pos_); 76094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_->AddTask(Thread::Current(), task); 76194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 76294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != nullptr); 7630e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_LT(mark_stack_pos_, kMaxSize); 764cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier mark_stack_[mark_stack_pos_++].Assign(obj); 76594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 76694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 76794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 76894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 76994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 77094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 77194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 7721ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier virtual void Run(Thread* self ATTRIBUTE_UNUSED) 7731ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 7741ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 77594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 77694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 77794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 77897509954404d031594b2ecbda607314d169d512eMathieu Chartier BoundedFifoPowerOfTwo<mirror::Object*, kFifoSize> prefetch_fifo; 77994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (;;) { 78097509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* obj = nullptr; 78194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 78294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (mark_stack_pos_ != 0 && prefetch_fifo.size() < kFifoSize) { 78397509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const mark_stack_obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); 784277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe DCHECK(mark_stack_obj != nullptr); 785277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe __builtin_prefetch(mark_stack_obj); 786277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe prefetch_fifo.push_back(mark_stack_obj); 78794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 78894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(prefetch_fifo.empty())) { 78994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 79094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 79194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 79294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 79394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 79494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == 0)) { 79594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 79694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 797cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); 79894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 79911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 8000e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier visitor(obj); 80194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 80294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 80394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 80494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 80594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass CardScanTask : public MarkStackTask<false> { 80694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 8071ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier CardScanTask(ThreadPool* thread_pool, 8081ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MarkSweep* mark_sweep, 809a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, 8101ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uint8_t* begin, 8111ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uint8_t* end, 8121ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uint8_t minimum_age, 8131ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t mark_stack_size, 8141ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier StackReference<mirror::Object>* mark_stack_obj, 8151ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier bool clear_card) 81694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, mark_stack_size, mark_stack_obj), 81794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 81894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 81994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end), 8201ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier minimum_age_(minimum_age), 8211ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier clear_card_(clear_card) {} 82294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 82394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 824a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 82513735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const begin_; 82613735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const end_; 82713735955f39b3b304c37d2b2840663c131262c18Ian Rogers const uint8_t minimum_age_; 828727b294b4091cf3cc2f8137cd654552f477fe46aLei Li const bool clear_card_; 82994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 83094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 83194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 83294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 83394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 83494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 83594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 83694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = mark_sweep_->GetHeap()->GetCardTable(); 8371ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t cards_scanned = clear_card_ 8381ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ? card_table->Scan<true>(bitmap_, begin_, end_, visitor, minimum_age_) 8391ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier : card_table->Scan<false>(bitmap_, begin_, end_, visitor, minimum_age_); 8400f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier VLOG(heap) << "Parallel scanning cards " << reinterpret_cast<void*>(begin_) << " - " 8410f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier << reinterpret_cast<void*>(end_) << " = " << cards_scanned; 84294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 84394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 84494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 845cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 846cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 8472775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiersize_t MarkSweep::GetThreadCount(bool paused) const { 848f8484c8b55f4b423048f94dfabbe44110a039a9bMathieu Chartier // Use less threads if we are in a background state (non jank perceptible) since we want to leave 849f8484c8b55f4b423048f94dfabbe44110a039a9bMathieu Chartier // more CPU time for the foreground apps. 850f8484c8b55f4b423048f94dfabbe44110a039a9bMathieu Chartier if (heap_->GetThreadPool() == nullptr || !Runtime::Current()->InJankPerceptibleProcessState()) { 851bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return 1; 8522775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 85310d6886c9ce3ed87431cf10d376a69c23950fa61Mathieu Chartier return (paused ? heap_->GetParallelGCThreadCount() : heap_->GetConcGCThreadCount()) + 1; 8542775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier} 8552775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier 85613735955f39b3b304c37d2b2840663c131262c18Ian Rogersvoid MarkSweep::ScanGrayObjects(bool paused, uint8_t minimum_age) { 85794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = GetHeap()->GetCardTable(); 85894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 8592775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 8602775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier // The parallel version with only one thread is faster for card scanning, TODO: fix. 861bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kParallelCardScan && thread_count > 1) { 862720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 86394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Can't have a different split for each space since multiple spaces can have their cards being 86494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // scanned at the same time. 865f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(paused ? "(Paused)ScanGrayObjects" : __FUNCTION__, 866f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier GetTimings()); 86794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Try to take some of the mark stack since we can pass this off to the worker tasks. 86897509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack_begin = mark_stack_->Begin(); 86997509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack_end = mark_stack_->End(); 870720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier const size_t mark_stack_size = mark_stack_end - mark_stack_begin; 87194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Estimated number of work tasks we will create. 87294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_tasks = GetHeap()->GetContinuousSpaces().size() * thread_count; 87394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_NE(mark_stack_tasks, 0U); 87494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_delta = std::min(CardScanTask::kMaxSize / 2, 87594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_size / mark_stack_tasks + 1); 87694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 877590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() == nullptr) { 878590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 879590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 88013735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* card_begin = space->Begin(); 88113735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* card_end = space->End(); 8820941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Align up the end address. For example, the image space's end 8830941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // may not be card-size-aligned. 8840941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi card_end = AlignUp(card_end, accounting::CardTable::kCardSize); 88514d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(card_begin, accounting::CardTable::kCardSize); 88614d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(card_end, accounting::CardTable::kCardSize); 88794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how many bytes of heap we will scan, 88894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t address_range = card_end - card_begin; 88994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how much address range each task gets. 89094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t card_delta = RoundUp(address_range / thread_count + 1, 89194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable::kCardSize); 892727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // If paused and the space is neither zygote nor image space, we could clear the dirty 893727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // cards to avoid accumulating them to increase card scanning load in the following GC 894727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // cycles. We need to keep dirty cards of image space and zygote space in order to track 895727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // references to the other spaces. 896727b294b4091cf3cc2f8137cd654552f477fe46aLei Li bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); 89794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create the worker tasks for this space. 89894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (card_begin != card_end) { 89994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add a range of cards. 90094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t addr_remaining = card_end - card_begin; 90194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t card_increment = std::min(card_delta, addr_remaining); 90294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Take from the back of the mark stack. 90394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_remaining = mark_stack_end - mark_stack_begin; 90494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining); 90594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_end -= mark_stack_increment; 90694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment)); 9070e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_EQ(mark_stack_end, mark_stack_->End()); 90894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add the new task to the thread pool. 9091ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier auto* task = new CardScanTask(thread_pool, 9101ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier this, 9111ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->GetMarkBitmap(), 9121ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier card_begin, 9131ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier card_begin + card_increment, 9141ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier minimum_age, 9151ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_stack_increment, 9161ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_stack_end, 9171ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier clear_card); 91894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 91994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin += card_increment; 92094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 92194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 9220f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 9230941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Note: the card scan below may dirty new cards (and scan them) 9240941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // as a side effect when a Reference object is encountered and 9250941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // queued during the marking. See b/11465268. 9262775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 92794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 9282775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 92994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 93094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 93194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 932590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() != nullptr) { 933590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Image spaces are handled properly since live == marked for them. 934f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier const char* name = nullptr; 935590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier switch (space->GetGcRetentionPolicy()) { 936f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyNeverCollect: 937f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayImageSpaceObjects" : "ScanGrayImageSpaceObjects"; 938f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 939f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyFullCollect: 940f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayZygoteSpaceObjects" : "ScanGrayZygoteSpaceObjects"; 941f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 942f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyAlwaysCollect: 943f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayAllocSpaceObjects" : "ScanGrayAllocSpaceObjects"; 944f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 945f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier default: 946f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier LOG(FATAL) << "Unreachable"; 9472c4257be8191c5eefde744e8965fcefc80a0a97dIan Rogers UNREACHABLE(); 948f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 949f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(name, GetTimings()); 950590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier ScanObjectVisitor visitor(this); 951727b294b4091cf3cc2f8137cd654552f477fe46aLei Li bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); 952727b294b4091cf3cc2f8137cd654552f477fe46aLei Li if (clear_card) { 9531ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier card_table->Scan<true>(space->GetMarkBitmap(), 9541ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->Begin(), 9551ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->End(), 9561ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier visitor, 957727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age); 958727b294b4091cf3cc2f8137cd654552f477fe46aLei Li } else { 9591ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier card_table->Scan<false>(space->GetMarkBitmap(), 9601ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->Begin(), 9611ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->End(), 9621ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier visitor, 963727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age); 964727b294b4091cf3cc2f8137cd654552f477fe46aLei Li } 965590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 96694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 96794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 96894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier} 96994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 97094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass RecursiveMarkTask : public MarkStackTask<false> { 97194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 9721ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier RecursiveMarkTask(ThreadPool* thread_pool, 9731ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MarkSweep* mark_sweep, 9741ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, 9751ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uintptr_t begin, 9761ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uintptr_t end) 9771ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, 0, nullptr), 9781ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier bitmap_(bitmap), 9791ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier begin_(begin), 9801ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier end_(end) {} 98194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 98294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 983a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 98494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t begin_; 98594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t end_; 98694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 98794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 98894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 98994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 99094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 99194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 99294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 99394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 99494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_->VisitMarkedRange(begin_, end_, visitor); 99594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 99694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 99794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 99894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 99994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 100058551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// Populates the mark stack based on the set of marked objects and 100158551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// recursively marks until the mark stack is emptied. 10022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::RecursiveMark() { 1003f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1004a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // RecursiveMark will build the lists of known instances of the Reference classes. See 1005a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // DelayReferenceReferent for details. 100694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseRecursiveMark) { 100794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const bool partial = GetGcType() == kGcTypePartial; 100894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectVisitor scan_visitor(this); 100994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* self = Thread::Current(); 101094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = heap_->GetThreadPool(); 10112775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(false); 10122775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const bool parallel = kParallelRecursiveMark && thread_count > 1; 101394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->Reset(); 101402e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 10151d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if ((space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) || 10161d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (!partial && space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) { 10170e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = space->GetMarkBitmap(); 10180e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_ == nullptr) { 1019590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 10202b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 102194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (parallel) { 102294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We will use the mark stack the future. 102394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // CHECK(mark_stack_->IsEmpty()); 102494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 102594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 102694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 10273e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers atomic_finger_.StoreRelaxed(AtomicInteger::MaxValue()); 102894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 102994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create a few worker tasks. 10302775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t n = thread_count * 2; 103194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (begin != end) { 103294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t start = begin; 103394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t delta = (end - begin) / n; 103494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delta = RoundUp(delta, KB); 103594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (delta < 16 * KB) delta = end - begin; 103694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin += delta; 10371ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier auto* task = new RecursiveMarkTask(thread_pool, 10381ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier this, 10391ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier current_space_bitmap_, 10401ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier start, 104194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin); 104294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 104394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 10442775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 104594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 10462775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 104794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 104894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 104994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 105094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 105194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 10520e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_->VisitMarkedRange(begin, end, scan_visitor); 105394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 1054357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1055357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1056357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 105794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(false); 105858551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 105958551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 106013735955f39b3b304c37d2b2840663c131262c18Ian Rogersvoid MarkSweep::RecursiveMarkDirtyObjects(bool paused, uint8_t minimum_age) { 106194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanGrayObjects(paused, minimum_age); 106294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(paused); 1063262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier} 1064262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 106558551df3c2646ed507feec9e9eb3768085a76059Carl Shapirovoid MarkSweep::ReMarkRoots() { 1066f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1067893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(Thread::Current()); 1068bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(this, static_cast<VisitRootFlags>( 1069bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier kVisitRootFlagNewRoots | kVisitRootFlagStopLoggingNewRoots | kVisitRootFlagClearRootLog)); 10707bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier if (kVerifyRootsMarked) { 1071277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("(Paused)VerifyRoots", GetTimings()); 1072bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier VerifyRootMarkedVisitor visitor(this); 1073bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(&visitor); 1074893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 107558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 107658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 10770f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::SweepSystemWeaks(Thread* self) { 1078f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 107914c3bf91b2ec434295ec84d6446f495fb7de6d5cMathieu Chartier ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 108097509954404d031594b2ecbda607314d169d512eMathieu Chartier Runtime::Current()->SweepSystemWeaks(this); 108169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 108269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 108397509954404d031594b2ecbda607314d169d512eMathieu Chartierclass VerifySystemWeakVisitor : public IsMarkedVisitor { 108497509954404d031594b2ecbda607314d169d512eMathieu Chartier public: 108597509954404d031594b2ecbda607314d169d512eMathieu Chartier explicit VerifySystemWeakVisitor(MarkSweep* mark_sweep) : mark_sweep_(mark_sweep) {} 108697509954404d031594b2ecbda607314d169d512eMathieu Chartier 10871ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier virtual mirror::Object* IsMarked(mirror::Object* obj) 10881ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier OVERRIDE 108990443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 109097509954404d031594b2ecbda607314d169d512eMathieu Chartier mark_sweep_->VerifyIsLive(obj); 109197509954404d031594b2ecbda607314d169d512eMathieu Chartier return obj; 109297509954404d031594b2ecbda607314d169d512eMathieu Chartier } 109397509954404d031594b2ecbda607314d169d512eMathieu Chartier 109497509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkSweep* const mark_sweep_; 109597509954404d031594b2ecbda607314d169d512eMathieu Chartier}; 1096c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 109797509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::VerifyIsLive(const mirror::Object* obj) { 10984aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier if (!heap_->GetLiveBitmap()->Test(obj)) { 1099cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier // TODO: Consider live stack? Has this code bitrotted? 1100cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier CHECK(!heap_->allocation_stack_->Contains(obj)) 1101cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier << "Found dead object " << obj << "\n" << heap_->DumpSpaces(); 1102c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 1103c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1104c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1105c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifySystemWeaks() { 1106f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 11076aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier // Verify system weaks, uses a special object visitor which returns the input object. 110897509954404d031594b2ecbda607314d169d512eMathieu Chartier VerifySystemWeakVisitor visitor(this); 110997509954404d031594b2ecbda607314d169d512eMathieu Chartier Runtime::Current()->SweepSystemWeaks(&visitor); 1110c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1111c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1112bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass CheckpointMarkThreadRoots : public Closure, public RootVisitor { 1113858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier public: 11143887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain CheckpointMarkThreadRoots(MarkSweep* mark_sweep, 11153887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) 11160f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier : mark_sweep_(mark_sweep), 11170f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint_( 11180f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 11190f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier } 1120858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1121bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoots(mirror::Object*** roots, size_t count, const RootInfo& info ATTRIBUTE_UNUSED) 112290443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) 112390443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 1124bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 1125bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier mark_sweep_->MarkObjectNonNullParallel(*roots[i]); 1126bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1127bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1128bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 11291ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier void VisitRoots(mirror::CompressedReference<mirror::Object>** roots, 11301ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t count, 1131bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) 113290443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) 113390443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 1134bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 1135bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier mark_sweep_->MarkObjectNonNullParallel(roots[i]->AsMirrorPtr()); 1136bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1137bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1138bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 11394aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier virtual void Run(Thread* thread) OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 1140dabdc0fe183d4684f3cf4d70cb09d318cff81b42Mathieu Chartier ScopedTrace trace("Marking thread roots"); 1141858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier // Note: self is not necessarily equal to thread since thread may be suspended. 1142bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Thread* const self = Thread::Current(); 1143d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier CHECK(thread == self || thread->IsSuspended() || thread->GetState() == kWaitingPerformingGc) 1144d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << thread->GetState() << " thread " << thread << " self " << self; 1145bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier thread->VisitRoots(this); 11460f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (revoke_ros_alloc_thread_local_buffers_at_checkpoint_) { 1147dabdc0fe183d4684f3cf4d70cb09d318cff81b42Mathieu Chartier ScopedTrace trace2("RevokeRosAllocThreadLocalBuffers"); 1148c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi mark_sweep_->GetHeap()->RevokeRosAllocThreadLocalBuffers(thread); 1149c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1150dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // If thread is a running mutator, then act on behalf of the garbage collector. 1151dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // See the code in ThreadList::RunCheckpoint. 115210d2508b105427ef1bcaf0c222873bae7acc66d3Mathieu Chartier mark_sweep_->GetBarrier().Pass(self); 1153858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier } 1154858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1155858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier private: 11564aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier MarkSweep* const mark_sweep_; 11570f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier const bool revoke_ros_alloc_thread_local_buffers_at_checkpoint_; 1158858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier}; 1159858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 11600f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::MarkRootsCheckpoint(Thread* self, 11610f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 1162f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 11630f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CheckpointMarkThreadRoots check_point(this, revoke_ros_alloc_thread_local_buffers_at_checkpoint); 1164858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 11651d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Request the check point is run on all threads returning a count of the threads that must 11661d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // run through the barrier including self. 11671d54e73444e017d3a65234e0f193846f3e27472bIan Rogers size_t barrier_count = thread_list->RunCheckpoint(&check_point); 11681d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Release locks then wait for all mutator threads to pass the barrier. 1169dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // If there are no threads to wait which implys that all the checkpoint functions are finished, 1170dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // then no need to release locks. 1171dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li if (barrier_count == 0) { 1172dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li return; 1173dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li } 11741d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 11751d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedUnlock(self); 11764aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier { 11774aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier ScopedThreadStateChange tsc(self, kWaitingForCheckPointsToRun); 11784aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier gc_barrier_->Increment(self, barrier_count); 11794aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier } 11801d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedLock(self); 11811d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveLock(self); 1182858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 1183858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 11841d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::SweepArray(accounting::ObjectStack* allocations, bool swap_bitmaps) { 1185f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1186e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Thread* self = Thread::Current(); 1187bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi mirror::Object** chunk_free_buffer = reinterpret_cast<mirror::Object**>( 1188bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi sweep_array_free_buffer_mem_map_->BaseBegin()); 1189e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t chunk_free_pos = 0; 119010fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier ObjectBytePair freed; 119110fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier ObjectBytePair freed_los; 1192e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // How many objects are left in the array, modified after each space is swept. 119397509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* objects = allocations->Begin(); 1194e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t count = allocations->Size(); 1195e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Change the order to ensure that the non-moving space last swept as an optimization. 1196e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::vector<space::ContinuousSpace*> sweep_spaces; 1197e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::ContinuousSpace* non_moving_space = nullptr; 1198e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : heap_->GetContinuousSpaces()) { 1199763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier if (space->IsAllocSpace() && 1200763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier !immune_spaces_.ContainsSpace(space) && 12018d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier space->GetLiveBitmap() != nullptr) { 1202e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space == heap_->GetNonMovingSpace()) { 1203e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier non_moving_space = space; 1204e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1205e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(space); 1206e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1207e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1208e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1209e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Unlikely to sweep a significant amount of non_movable objects, so we do these after the after 1210e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the other alloc spaces as an optimization. 1211e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (non_moving_space != nullptr) { 1212e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(non_moving_space); 1213e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1214e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Start by sweeping the continuous spaces. 1215e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : sweep_spaces) { 1216e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::AllocSpace* alloc_space = space->AsAllocSpace(); 1217a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* live_bitmap = space->GetLiveBitmap(); 1218a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); 1219e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (swap_bitmaps) { 1220e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::swap(live_bitmap, mark_bitmap); 1221e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 122297509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* out = objects; 1223e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (size_t i = 0; i < count; ++i) { 122497509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const obj = objects[i].AsMirrorPtr(); 1225f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1226f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1227f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1228e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space->HasAddress(obj)) { 1229e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // This object is in the space, remove it from the array and add it to the sweep buffer 1230e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // if needed. 1231e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!mark_bitmap->Test(obj)) { 1232e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos >= kSweepArrayChunkFreeSize) { 1233277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("FreeList", GetTimings()); 123410fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.objects += chunk_free_pos; 123510fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1236e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1237e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1238e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_buffer[chunk_free_pos++] = obj; 1239e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1240e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1241cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier (out++)->Assign(obj); 1242e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1243e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1244e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos > 0) { 1245277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("FreeList", GetTimings()); 124610fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.objects += chunk_free_pos; 124710fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1248e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1249e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1250e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // All of the references which space contained are no longer in the allocation stack, update 1251e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the count. 1252e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier count = out - objects; 1253e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1254e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle the large object space. 12551d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 12562dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (large_object_space != nullptr) { 12572dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier accounting::LargeObjectBitmap* large_live_objects = large_object_space->GetLiveBitmap(); 12582dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier accounting::LargeObjectBitmap* large_mark_objects = large_object_space->GetMarkBitmap(); 12592dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (swap_bitmaps) { 12602dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier std::swap(large_live_objects, large_mark_objects); 1261f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 12622dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier for (size_t i = 0; i < count; ++i) { 126397509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const obj = objects[i].AsMirrorPtr(); 12642dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier // Handle large objects. 12652dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (kUseThreadLocalAllocationStack && obj == nullptr) { 12662dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier continue; 12672dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 12682dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (!large_mark_objects->Test(obj)) { 12692dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier ++freed_los.objects; 12702dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier freed_los.bytes += large_object_space->Free(self, obj); 12712dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 1272357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1273357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1274f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier { 1275277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("RecordFree", GetTimings()); 1276f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier RecordFree(freed); 1277f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier RecordFreeLOS(freed_los); 1278277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe t2.NewTiming("ResetStack"); 1279f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier allocations->Reset(); 1280f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 1281c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers sweep_array_free_buffer_mem_map_->MadviseDontNeedAndZero(); 1282357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 1283357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 12841d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::Sweep(bool swap_bitmaps) { 1285f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 12860f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Ensure that nobody inserted items in the live stack after we swapped the stacks. 12870f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CHECK_GE(live_stack_freeze_size_, GetHeap()->GetLiveStack()->Size()); 1288f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier { 1289f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t2("MarkAllocStackAsLive", GetTimings()); 1290f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier // Mark everything allocated since the last as GC live so that we can sweep concurrently, 1291f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier // knowing that new allocations won't be marked as live. 1292f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier accounting::ObjectStack* live_stack = heap_->GetLiveStack(); 1293f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier heap_->MarkAllocStackAsLive(live_stack); 1294f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier live_stack->Reset(); 1295f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier DCHECK(mark_stack_->IsEmpty()); 1296f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 129702e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1298a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier if (space->IsContinuousMemMapAllocSpace()) { 1299a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); 1300f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming split( 13011ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier alloc_space->IsZygoteSpace() ? "SweepZygoteSpace" : "SweepMallocSpace", 13021ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier GetTimings()); 130310fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier RecordFree(alloc_space->Sweep(swap_bitmaps)); 130458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 130558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 13062b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SweepLargeObjects(swap_bitmaps); 130758551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 130858551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 1309e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartiervoid MarkSweep::SweepLargeObjects(bool swap_bitmaps) { 13102dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier space::LargeObjectSpace* los = heap_->GetLargeObjectsSpace(); 13112dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (los != nullptr) { 13122dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier TimingLogger::ScopedTiming split(__FUNCTION__, GetTimings()); 13132dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier RecordFreeLOS(los->Sweep(swap_bitmaps)); 13142dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 1315e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier} 1316e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier 1317407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// Process the "referent" field in a java.lang.ref.Reference. If the referent has not yet been 1318407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// marked, put it on the appropriate list in the heap for later processing. 1319407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::DelayReferenceReferent(mirror::Class* klass, mirror::Reference* ref) { 132097509954404d031594b2ecbda607314d169d512eMathieu Chartier heap_->GetReferenceProcessor()->DelayReferenceReferent(klass, ref, this); 132169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 132269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 132397509954404d031594b2ecbda607314d169d512eMathieu Chartierclass MarkVisitor { 132402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier public: 13251ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE explicit MarkVisitor(MarkSweep* const mark_sweep) : mark_sweep_(mark_sweep) {} 132602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 13271ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE void operator()(mirror::Object* obj, 13281ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MemberOffset offset, 13291ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier bool is_static ATTRIBUTE_UNUSED) const 13301ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 13311ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 133294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 13332b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 13342b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 13352b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1336eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi mark_sweep_->MarkObject(obj->GetFieldObject<mirror::Object>(offset), obj, offset); 133702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 133802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 1339da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const 13401ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 13411ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 1342da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (!root->IsNull()) { 1343da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier VisitRoot(root); 1344da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1345da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1346da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 1347da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const 13481ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 13491ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 1350da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (kCheckLocks) { 1351da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 1352da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 1353da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1354da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier mark_sweep_->MarkObject(root->AsMirrorPtr()); 1355da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1356da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 135702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier private: 135802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MarkSweep* const mark_sweep_; 135902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier}; 136002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 136169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Scans an object reference. Determines the type of the reference 136269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// and dispatches to a specialized scanning routine. 136397509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::ScanObject(mirror::Object* obj) { 136497509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkVisitor mark_visitor(this); 1365407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(this); 1366407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ScanObjectVisit(obj, mark_visitor, ref_visitor); 136702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 136802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 13692775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiervoid MarkSweep::ProcessMarkStackParallel(size_t thread_count) { 137002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier Thread* self = Thread::Current(); 137102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 13722775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t chunk_size = std::min(mark_stack_->Size() / thread_count + 1, 13732775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier static_cast<size_t>(MarkStackTask<false>::kMaxSize)); 137494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier CHECK_GT(chunk_size, 0U); 137594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Split the current mark stack up into work tasks. 1376cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier for (auto* it = mark_stack_->Begin(), *end = mark_stack_->End(); it < end; ) { 137794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t delta = std::min(static_cast<size_t>(end - it), chunk_size); 13780e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier thread_pool->AddTask(self, new MarkStackTask<false>(thread_pool, this, delta, it)); 137994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier it += delta; 138002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 13812775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 138202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier thread_pool->StartWorkers(self); 13832775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 138494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 138502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_stack_->Reset(); 13863e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers CHECK_EQ(work_chunks_created_.LoadSequentiallyConsistent(), 13873e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_deleted_.LoadSequentiallyConsistent()) 13883e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " some of the work chunks were leaked"; 138969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 139069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 13915d76c435082332ef79a22962386fa92a0870e378Ian Rogers// Scan anything that's on the mark stack. 139294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ProcessMarkStack(bool paused) { 1393f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(paused ? "(Paused)ProcessMarkStack" : __FUNCTION__, GetTimings()); 13942775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 13952775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelProcessMarkStack && thread_count > 1 && 13962775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier mark_stack_->Size() >= kMinimumParallelMarkStackSize) { 13972775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier ProcessMarkStackParallel(thread_count); 139894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 139994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 140094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 140197509954404d031594b2ecbda607314d169d512eMathieu Chartier BoundedFifoPowerOfTwo<mirror::Object*, kFifoSize> prefetch_fifo; 1402d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier for (;;) { 140397509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* obj = nullptr; 140494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 140594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (!mark_stack_->IsEmpty() && prefetch_fifo.size() < kFifoSize) { 140697509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* mark_stack_obj = mark_stack_->PopBack(); 14072cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier DCHECK(mark_stack_obj != nullptr); 1408277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe __builtin_prefetch(mark_stack_obj); 1409277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe prefetch_fifo.push_back(mark_stack_obj); 141094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 141194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (prefetch_fifo.empty()) { 141294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 141394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 141494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 141594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 141694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 141794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_->IsEmpty()) { 141894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 141994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 142094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_->PopBack(); 1421d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier } 14224aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier DCHECK(obj != nullptr); 1423d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier ScanObject(obj); 1424357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1425357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 142669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 142769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 142897509954404d031594b2ecbda607314d169d512eMathieu Chartierinline mirror::Object* MarkSweep::IsMarked(mirror::Object* object) { 1429763a31ed7a2bfad22a9cb07f5301a71c0f97ca49Mathieu Chartier if (immune_spaces_.IsInImmuneRegion(object)) { 143097509954404d031594b2ecbda607314d169d512eMathieu Chartier return object; 14317469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 14320e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_->HasAddress(object)) { 143397509954404d031594b2ecbda607314d169d512eMathieu Chartier return current_space_bitmap_->Test(object) ? object : nullptr; 14347469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 143597509954404d031594b2ecbda607314d169d512eMathieu Chartier return mark_bitmap_->Test(object) ? object : nullptr; 14367469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier} 14377469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier 14382b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::FinishPhase() { 1439f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1440d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountScannedTypes) { 144152a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier VLOG(gc) 144252a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << "MarkSweep scanned" 144352a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " no reference objects=" << no_reference_class_count_.LoadRelaxed() 144452a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " normal objects=" << normal_count_.LoadRelaxed() 144552a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " classes=" << class_count_.LoadRelaxed() 144652a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " object arrays=" << object_array_count_.LoadRelaxed() 144752a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " references=" << reference_count_.LoadRelaxed() 144852a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " other=" << other_count_.LoadRelaxed(); 144902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 145002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kCountTasks) { 14513e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Total number of work chunks allocated: " << work_chunks_created_.LoadRelaxed(); 145202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 145302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kMeasureOverhead) { 14543e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Overhead time " << PrettyDuration(overhead_time_.LoadRelaxed()); 145502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 145602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 14573e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Large objects tested " << large_object_test_.LoadRelaxed() 14583e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " marked " << large_object_mark_.LoadRelaxed(); 145902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 14600e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 14613e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Marked: null=" << mark_null_count_.LoadRelaxed() 14623e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " immune=" << mark_immune_count_.LoadRelaxed() 14633e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " fastpath=" << mark_fastpath_count_.LoadRelaxed() 14643e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " slowpath=" << mark_slowpath_count_.LoadRelaxed(); 14650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 14664aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier CHECK(mark_stack_->IsEmpty()); // Ensure that the mark stack is empty. 14675301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier mark_stack_->Reset(); 1468a9d82fe8bc6960b565245b920e99107a824ca515Mathieu Chartier Thread* const self = Thread::Current(); 1469a9d82fe8bc6960b565245b920e99107a824ca515Mathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1470a9d82fe8bc6960b565245b920e99107a824ca515Mathieu Chartier WriterMutexLock mu2(self, *Locks::heap_bitmap_lock_); 14714aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->ClearMarkedObjects(); 147269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 147369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 1474c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchivoid MarkSweep::RevokeAllThreadLocalBuffers() { 1475c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi if (kRevokeRosAllocThreadLocalBuffersAtCheckpoint && IsConcurrent()) { 1476c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // If concurrent, rosalloc thread-local buffers are revoked at the 1477c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // thread checkpoint. Bump pointer space thread-local buffers must 1478c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // not be in use. 1479c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->AssertAllBumpPointerSpaceThreadLocalBuffersAreRevoked(); 1480c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } else { 1481f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1482c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->RevokeAllThreadLocalBuffers(); 1483c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1484c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi} 1485c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 14861d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace collector 14871d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace gc 148869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} // namespace art 1489