mark_sweep.cc revision 1ac1c2bba3ff0835cbae4753621f38dc935ebd91
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 25cf7f19135f0e273f7b0136315633c2abfc715343Ian Rogers#define ATRACE_TAG ATRACE_TAG_DALVIK 26cf7f19135f0e273f7b0136315633c2abfc715343Ian Rogers#include "cutils/trace.h" 27cf7f19135f0e273f7b0136315633c2abfc715343Ian Rogers 2894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier#include "base/bounded_fifo.h" 2907ed66b5ae659c452cbe1ab20c3dbf1d6f546461Elliott Hughes#include "base/logging.h" 30761600567d73b23324ae0251e871c15d6849ffd8Elliott Hughes#include "base/macros.h" 31693ff61274cd2c9b8eb7e68c370f84a911b8ca52Ian Rogers#include "base/mutex-inl.h" 3280afd02024d20e60b197d3adfbb43cc303cf29e0Vladimir Marko#include "base/time_utils.h" 33a84395489098e4531619b1cffd1afc282b14510eSameer Abu Asal#include "base/timing_logger.h" 341d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/accounting/card_table-inl.h" 354aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier#include "gc/accounting/heap_bitmap-inl.h" 3611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier#include "gc/accounting/mod_union_table.h" 371d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/accounting/space_bitmap-inl.h" 381d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/heap.h" 3978f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier#include "gc/reference_processor.h" 401d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/large_object_space.h" 411d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/space-inl.h" 422dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mark_sweep-inl.h" 432dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object-inl.h" 441f87008b165d26541d832ff805250afdc89c253dBrian Carlstrom#include "runtime.h" 454aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier#include "scoped_thread_state_change.h" 461d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "thread-inl.h" 476f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier#include "thread_list.h" 4869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 4969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapironamespace art { 501d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace gc { 511d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace collector { 5269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 5302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Performance options. 54eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseRecursiveMark = false; 55eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseMarkStackPrefetch = true; 56eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kSweepArrayChunkFreeSize = 1024; 57eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kPreCleanCards = true; 5894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 5994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Parallelism options. 60eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelCardScan = true; 61eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelRecursiveMark = true; 6294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Don't attempt to parallelize mark stack processing unless the mark stack is at least n 6394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// elements. This is temporary until we reduce the overhead caused by allocating tasks, etc.. Not 6494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// having this can add overhead in ProcessReferences since we may end up doing many calls of 6594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// ProcessMarkStack with very small mark stacks. 66eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kMinimumParallelMarkStackSize = 128; 67eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelProcessMarkStack = true; 68858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 6902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Profiling and information flags. 70eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kProfileLargeObjects = false; 71eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kMeasureOverhead = false; 72eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCountTasks = false; 730e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierstatic constexpr bool kCountMarkedObjects = false; 7494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 7594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Turn off kCheckLocks when profiling the GC since it slows the GC down by up to 40%. 76eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCheckLocks = kDebugLocking; 777bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartierstatic constexpr bool kVerifyRootsMarked = kIsDebugBuild; 7802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 79c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// If true, revoke the rosalloc thread-local buffers at the 80c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// checkpoint, as opposed to during the pause. 81c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchistatic constexpr bool kRevokeRosAllocThreadLocalBuffersAtCheckpoint = true; 82c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::BindBitmaps() { 84f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 862b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Mark all of the spaces we never collect as immune. 8794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 881d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyNeverCollect) { 898d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier CHECK(immune_region_.AddContinuousSpace(space)) << "Failed to add space " << *space; 902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 922b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 941d54e73444e017d3a65234e0f193846f3e27472bIan RogersMarkSweep::MarkSweep(Heap* heap, bool is_concurrent, const std::string& name_prefix) 951d54e73444e017d3a65234e0f193846f3e27472bIan Rogers : GarbageCollector(heap, 96590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier name_prefix + 971d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (is_concurrent ? "concurrent mark sweep": "mark sweep")), 981ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier current_space_bitmap_(nullptr), 991ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_bitmap_(nullptr), 1001ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_stack_(nullptr), 10135883cc623fdf475a4ead1dafcba9e9becc1ed11Mathieu Chartier gc_barrier_(new Barrier(0)), 102958291c7afe723d846a39539fd00410c102485f3Mathieu Chartier mark_stack_lock_("mark sweep mark stack lock", kMarkSweepMarkStackLock), 1031ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier is_concurrent_(is_concurrent), 1041ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier live_stack_freeze_size_(0) { 105bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi std::string error_msg; 106bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi MemMap* mem_map = MemMap::MapAnonymous( 107bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi "mark sweep sweep array free buffer", nullptr, 108bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi RoundUp(kSweepArrayChunkFreeSize * sizeof(mirror::Object*), kPageSize), 1095c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko PROT_READ | PROT_WRITE, false, false, &error_msg); 110bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi CHECK(mem_map != nullptr) << "Couldn't allocate sweep array free buffer: " << error_msg; 111bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi sweep_array_free_buffer_mem_map_.reset(mem_map); 1125301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier} 113b3bd5f07884f5a1f2b84224363b1372d7c28d447Elliott Hughes 1142b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::InitializePhase() { 115f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 116eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier mark_stack_ = heap_->GetMarkStack(); 117e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier DCHECK(mark_stack_ != nullptr); 1188d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier immune_region_.Reset(); 11952a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier no_reference_class_count_.StoreRelaxed(0); 12052a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier normal_count_.StoreRelaxed(0); 1213e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers class_count_.StoreRelaxed(0); 12252a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier object_array_count_.StoreRelaxed(0); 1233e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers other_count_.StoreRelaxed(0); 12452a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier reference_count_.StoreRelaxed(0); 1253e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers large_object_test_.StoreRelaxed(0); 1263e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers large_object_mark_.StoreRelaxed(0); 1273e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers overhead_time_ .StoreRelaxed(0); 1283e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_created_.StoreRelaxed(0); 1293e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_deleted_.StoreRelaxed(0); 1303e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_null_count_.StoreRelaxed(0); 1313e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_immune_count_.StoreRelaxed(0); 1323e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_fastpath_count_.StoreRelaxed(0); 1333e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_slowpath_count_.StoreRelaxed(0); 1340e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier { 135eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier // TODO: I don't think we should need heap bitmap lock to Get the mark bitmap. 1360e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 1370e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_bitmap_ = heap_->GetMarkBitmap(); 1380e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 13910fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier if (!GetCurrentIteration()->GetClearSoftReferences()) { 140df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi // Always clear soft references if a non-sticky collection. 14110fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier GetCurrentIteration()->SetClearSoftReferences(GetGcType() != collector::kGcTypeSticky); 142df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi } 1436f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier} 1446f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier 1456f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartiervoid MarkSweep::RunPhases() { 1466f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Thread* self = Thread::Current(); 1476f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier InitializePhase(); 1486f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Locks::mutator_lock_->AssertNotHeld(self); 1496f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier if (IsConcurrent()) { 1506f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerification(this); 1516f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1526f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1536f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1546f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1556f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1566f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1576f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1586f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1596f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } else { 1606f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1616f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerificationPaused(this); 1626f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1636f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1646f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1656f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1666f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1676f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1686f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Sweeping always done concurrently, even for non concurrent mark sweep. 1696f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1706f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReclaimPhase(); 1716f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1726f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PostGcVerification(this); 1736f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier FinishPhase(); 1742b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1752b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1762b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ProcessReferences(Thread* self) { 1778e56c7e41cb37e2eaf553503968a01ff893b135bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 17878f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->ProcessReferences( 1791ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier true, 1801ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier GetTimings(), 1811ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier GetCurrentIteration()->GetClearSoftReferences(), 1821ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier this); 1831ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier} 1841ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier 1850f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::PausePhase() { 186f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t("(Paused)PausePhase", GetTimings()); 1872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 1882b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 1890f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (IsConcurrent()) { 1900f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Handle the dirty objects if we are a concurrent GC. 1912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1922b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Re-mark root set. 1932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ReMarkRoots(); 1942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Scan dirty objects, this is only required if we are not doing concurrent GC. 19594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkDirtyObjects(true, accounting::CardTable::kCardDirty); 1962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1970f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier { 198f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t2("SwapStacks", GetTimings()); 1992b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 200a4f6af9b1e6380b31674d7ac645b1732c846ac06Mathieu Chartier heap_->SwapStacks(); 2010f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier live_stack_freeze_size_ = heap_->GetLiveStack()->Size(); 2020f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Need to revoke all the thread local allocation stacks since we just swapped the allocation 2030f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // stacks and don't want anybody to allocate into the live stack. 204c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 2052b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 2060f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier heap_->PreSweepingGcVerification(this); 2076f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Disallow new system weaks to prevent a race which occurs when someone adds a new system 2086f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // weak before we sweep them. Since this new system weak may not be marked, the GC may 2096f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // incorrectly sweep it. This also fixes a race where interning may attempt to return a strong 2106f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // reference to a string that is about to be swept. 2116f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Runtime::Current()->DisallowNewSystemWeaks(); 21278f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Enable the reference processing slow path, needs to be done with mutators paused since there 21378f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // is no lock in the GetReferent fast path. 21478f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->EnableSlowPath(); 2152b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2162b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 217dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartiervoid MarkSweep::PreCleanCards() { 218dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Don't do this for non concurrent GCs since they don't have any dirty cards. 219dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier if (kPreCleanCards && IsConcurrent()) { 220f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 221dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier Thread* self = Thread::Current(); 222dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier CHECK(!Locks::mutator_lock_->IsExclusiveHeld(self)); 223dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process dirty cards and add dirty cards to mod union tables, also ages cards. 2244add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li heap_->ProcessCards(GetTimings(), false, true, false); 225eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The checkpoint root marking is required to avoid a race condition which occurs if the 226eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // following happens during a reference write: 227eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 1. mutator dirties the card (write barrier) 228eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 2. GC ages the card (the above ProcessCards call) 229eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 3. GC scans the object (the RecursiveMarkDirtyObjects call below) 230eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 4. mutator writes the value (corresponding to the write barrier in 1.) 231eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // This causes the GC to age the card but not necessarily mark the reference which the mutator 232eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // wrote into the object stored in the card. 233eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // Having the checkpoint fixes this issue since it ensures that the card mark and the 234eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // reference write are visible to the GC before the card is scanned (this is due to locks being 235eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // acquired / released in the checkpoint code). 236eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The other roots are also marked to help reduce the pause. 2370f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, false); 238dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier MarkNonThreadRoots(); 239893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 240893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagClearRootLog | kVisitRootFlagNewRoots)); 241dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process the newly aged cards. 242dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier RecursiveMarkDirtyObjects(false, accounting::CardTable::kCardDirty - 1); 243dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // TODO: Empty allocation stack to reduce the number of objects we need to test / mark as live 244dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // in the next GC. 245dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier } 246dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier} 247dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier 248c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartiervoid MarkSweep::RevokeAllThreadLocalAllocationStacks(Thread* self) { 249c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier if (kUseThreadLocalAllocationStack) { 250f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 251c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 252c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier heap_->RevokeAllThreadLocalAllocationStacks(self); 253c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier } 254c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier} 255c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier 2562b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkingPhase() { 257f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 2582b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 2592b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier BindBitmaps(); 2600e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier FindDefaultSpaceBitmap(); 2612b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Process dirty cards and add dirty cards to mod union tables. 2624add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li // If the GC type is non sticky, then we just clear the cards instead of ageing them. 2634add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li heap_->ProcessCards(GetTimings(), false, true, GetGcType() != kGcTypeSticky); 2642b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 265893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkRoots(self); 2662b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkReachableObjects(); 267dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Pre-clean dirtied cards to reduce pauses. 268dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier PreCleanCards(); 2692b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2702b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 27111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartiervoid MarkSweep::UpdateAndMarkModUnion() { 27211409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier for (const auto& space : heap_->GetContinuousSpaces()) { 2738d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsSpace(space)) { 2741ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier const char* name = space->IsZygoteSpace() 2751ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ? "UpdateAndMarkZygoteModUnionTable" 2761ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier : "UpdateAndMarkImageModUnionTable"; 277f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(name, GetTimings()); 27811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier accounting::ModUnionTable* mod_union_table = heap_->FindModUnionTableFromSpace(space); 27911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier CHECK(mod_union_table != nullptr); 28097509954404d031594b2ecbda607314d169d512eMathieu Chartier mod_union_table->UpdateAndMarkReferences(this); 28111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 28211409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 28311409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier} 28411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier 2852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkReachableObjects() { 2864aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier UpdateAndMarkModUnion(); 2872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Recursively mark all the non-image bits set in the mark bitmap. 2882b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier RecursiveMark(); 2892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ReclaimPhase() { 292f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 293951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier Thread* const self = Thread::Current(); 29478f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Process the references concurrently. 29578f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier ProcessReferences(self); 2960f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier SweepSystemWeaks(self); 297951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier Runtime* const runtime = Runtime::Current(); 298951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier runtime->AllowNewSystemWeaks(); 299951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier // Clean up class loaders after system weaks are swept since that is how we know if class 300951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier // unloading occurred. 301951ec2c93c79c5539cbcc669566f0808d4460338Mathieu Chartier runtime->GetClassLinker()->CleanupClassLoaders(); 3022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier { 3032b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 3044460a84be92b5a94ecfb5c650aef4945ab849c93Hiroshi Yamauchi GetHeap()->RecordFreeRevoke(); 3052b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Reclaim unmarked objects. 3061d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Sweep(false); 3072b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Swap the live and mark bitmaps for each space which we modified space. This is an 3082b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // optimization that enables us to not clear live bits inside of the sweep. Only swaps unbound 3092b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // bitmaps. 3102b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SwapBitmaps(); 3112b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Unbind the live and mark bitmaps. 312a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier GetHeap()->UnBindBitmaps(); 3132b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 3142b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 3152b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3160e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartiervoid MarkSweep::FindDefaultSpaceBitmap() { 317f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 31802e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 319a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap = space->GetMarkBitmap(); 320bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // We want to have the main space instead of non moving if possible. 321590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (bitmap != nullptr && 322590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) { 3230e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = bitmap; 324bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // If we are not the non moving space exit the loop early since this will be good enough. 325bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (space != heap_->GetNonMovingSpace()) { 326bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier break; 327bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 328b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 329b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 3304c13a3ff475f206c4d0a86ee2595c45392fd942fMathieu Chartier CHECK(current_space_bitmap_ != nullptr) << "Could not find a default mark bitmap\n" 3314c13a3ff475f206c4d0a86ee2595c45392fd942fMathieu Chartier << heap_->DumpSpaces(); 33258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 33358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 334ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartiervoid MarkSweep::ExpandMarkStack() { 335ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier ResizeMarkStack(mark_stack_->Capacity() * 2); 336ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier} 337ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier 338ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartiervoid MarkSweep::ResizeMarkStack(size_t new_size) { 339ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Rare case, no need to have Thread::Current be a parameter. 340ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (UNLIKELY(mark_stack_->Size() < mark_stack_->Capacity())) { 341ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Someone else acquired the lock and expanded the mark stack before us. 342ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier return; 343ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 34497509954404d031594b2ecbda607314d169d512eMathieu Chartier std::vector<StackReference<mirror::Object>> temp(mark_stack_->Begin(), mark_stack_->End()); 345ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier CHECK_LE(mark_stack_->Size(), new_size); 346ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier mark_stack_->Resize(new_size); 347cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier for (auto& obj : temp) { 348cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier mark_stack_->PushBack(obj.AsMirrorPtr()); 349ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 350ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 351ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 352e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartiermirror::Object* MarkSweep::MarkObject(mirror::Object* obj) { 353e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier MarkObject(obj, nullptr, MemberOffset(0)); 354e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier return obj; 355e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier} 356e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier 35797509954404d031594b2ecbda607314d169d512eMathieu Chartierinline void MarkSweep::MarkObjectNonNullParallel(mirror::Object* obj) { 358bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(obj != nullptr); 359ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (MarkObjectParallel(obj)) { 360ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 361ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 362184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier ExpandMarkStack(); 363ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 364ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier // The object must be pushed on to the mark stack. 3650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 366ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 367ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 368ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 36997509954404d031594b2ecbda607314d169d512eMathieu Chartierbool MarkSweep::IsMarkedHeapReference(mirror::HeapReference<mirror::Object>* ref) { 37097509954404d031594b2ecbda607314d169d512eMathieu Chartier return IsMarked(ref->AsMirrorPtr()); 371308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier} 372308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier 373bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartierclass MarkSweepMarkObjectSlowPath { 374bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier public: 3751ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier explicit MarkSweepMarkObjectSlowPath(MarkSweep* mark_sweep, 3761ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mirror::Object* holder = nullptr, 377eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MemberOffset offset = MemberOffset(0)) 3781ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier : mark_sweep_(mark_sweep), holder_(holder), offset_(offset) {} 379bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 380da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void operator()(const mirror::Object* obj) const NO_THREAD_SAFETY_ANALYSIS { 381bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kProfileLargeObjects) { 382bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: Differentiate between marking and testing somehow. 383bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_test_; 384bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_mark_; 385bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 386bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier space::LargeObjectSpace* large_object_space = mark_sweep_->GetHeap()->GetLargeObjectsSpace(); 387a17288e3b9dd6751005fed3386251d2d0949be74Mathieu Chartier if (UNLIKELY(obj == nullptr || !IsAligned<kPageSize>(obj) || 3882dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier (kIsDebugBuild && large_object_space != nullptr && 3892dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier !large_object_space->Contains(obj)))) { 390175746ac9039e9b741d3521420dcaa9c59341738Mathieu Chartier LOG(INTERNAL_FATAL) << "Tried to mark " << obj << " not contained by any spaces"; 391eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi if (holder_ != nullptr) { 392d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi size_t holder_size = holder_->SizeOf(); 393eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi ArtField* field = holder_->FindFieldByOffset(offset_); 394d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi LOG(INTERNAL_FATAL) << "Field info: " 395d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " holder=" << holder_ 396679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << " holder is " 397679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << (mark_sweep_->GetHeap()->IsLiveObjectLocked(holder_) 398679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi ? "alive" : "dead") 399d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " holder_size=" << holder_size 400eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi << " holder_type=" << PrettyTypeOf(holder_) 401eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi << " offset=" << offset_.Uint32Value() 402d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " field=" << (field != nullptr ? field->GetName() : "nullptr") 403d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " field_type=" 404d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (field != nullptr ? field->GetTypeDescriptor() : "") 405d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " first_ref_field_offset=" 406d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (holder_->IsClass() 407e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier ? holder_->AsClass()->GetFirstReferenceStaticFieldOffset( 408e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier sizeof(void*)) 409d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi : holder_->GetClass()->GetFirstReferenceInstanceFieldOffset()) 410d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " num_of_ref_fields=" 411d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (holder_->IsClass() 412d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi ? holder_->AsClass()->NumReferenceStaticFields() 413d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi : holder_->GetClass()->NumReferenceInstanceFields()) 414d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << "\n"; 415679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi // Print the memory content of the holder. 416679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi for (size_t i = 0; i < holder_size / sizeof(uint32_t); ++i) { 417679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi uint32_t* p = reinterpret_cast<uint32_t*>(holder_); 418679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi LOG(INTERNAL_FATAL) << &p[i] << ": " << "holder+" << (i * sizeof(uint32_t)) << " = " 419679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << std::hex << p[i]; 420679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi } 421eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi } 422d38ec80b163af1639fbaae382a319c73be67c560Hiroshi Yamauchi PrintFileToLog("/proc/self/maps", LogSeverity::INTERNAL_FATAL); 42317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko MemMap::DumpMaps(LOG(INTERNAL_FATAL), true); 424d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi { 425d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi LOG(INTERNAL_FATAL) << "Attempting see if it's a bad root"; 426d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Thread* self = Thread::Current(); 427d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 428d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi mark_sweep_->VerifyRoots(); 429d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } else { 430d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi const bool heap_bitmap_exclusive_locked = 431d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->IsExclusiveHeld(self); 432d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (heap_bitmap_exclusive_locked) { 433d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 434d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 4354f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier { 4364f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier ScopedThreadSuspension(self, kSuspended); 4374f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier ScopedSuspendAll ssa(__FUNCTION__); 4384f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier mark_sweep_->VerifyRoots(); 4394f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier } 440d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (heap_bitmap_exclusive_locked) { 441d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->ExclusiveLock(self); 442d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 443d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 444d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 445bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(FATAL) << "Can't mark invalid object"; 446bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 447bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 448bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 449bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier private: 450bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweep* const mark_sweep_; 451eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi mirror::Object* const holder_; 452eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MemberOffset offset_; 453bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier}; 454bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 4551ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartierinline void MarkSweep::MarkObjectNonNull(mirror::Object* obj, 4561ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mirror::Object* holder, 45797509954404d031594b2ecbda607314d169d512eMathieu Chartier MemberOffset offset) { 4580e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 459624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 460624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 461624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 4629d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 4638d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 4640e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_immune_count_; 4660e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 467bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(mark_bitmap_->Test(obj)); 468bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else if (LIKELY(current_space_bitmap_->HasAddress(obj))) { 469bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kCountMarkedObjects) { 470bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_fastpath_count_; 471bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 472bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (UNLIKELY(!current_space_bitmap_->Set(obj))) { 473bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // This object was not previously marked. 474bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 475bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else { 4760e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4770e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_slowpath_count_; 4780e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 479eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MarkSweepMarkObjectSlowPath visitor(this, holder, offset); 480bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: We already know that the object is not in the current_space_bitmap_ but MarkBitmap::Set 481bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // will check again. 482bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (!mark_bitmap_->Set(obj, visitor)) { 483bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // Was not already marked, push. 484357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 4850e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 4860e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier} 4870e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier 48897509954404d031594b2ecbda607314d169d512eMathieu Chartierinline void MarkSweep::PushOnMarkStack(mirror::Object* obj) { 4890e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 4900e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // Lock is not needed but is here anyways to please annotalysis. 4910e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 4920e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ExpandMarkStack(); 49369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 4940e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // The object must be pushed on to the mark stack. 4950e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 49669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 49769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 49897509954404d031594b2ecbda607314d169d512eMathieu Chartierinline bool MarkSweep::MarkObjectParallel(mirror::Object* obj) { 4990e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 500624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 501624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 502624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 5039d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 5048d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 50597509954404d031594b2ecbda607314d169d512eMathieu Chartier DCHECK(IsMarked(obj) != nullptr); 50602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 50702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 50802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 50902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // the hard way. 510a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* object_bitmap = current_space_bitmap_; 511bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (LIKELY(object_bitmap->HasAddress(obj))) { 512bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !object_bitmap->AtomicTestAndSet(obj); 51302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 514bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweepMarkObjectSlowPath visitor(this); 515bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !mark_bitmap_->AtomicTestAndSet(obj, visitor); 51602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 51702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 51897509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::MarkHeapReference(mirror::HeapReference<mirror::Object>* ref) { 51997509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkObject(ref->AsMirrorPtr(), nullptr, MemberOffset(0)); 52097509954404d031594b2ecbda607314d169d512eMathieu Chartier} 52197509954404d031594b2ecbda607314d169d512eMathieu Chartier 5220e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier// Used to mark objects when processing the mark stack. If an object is null, it is not marked. 5231ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartierinline void MarkSweep::MarkObject(mirror::Object* obj, 5241ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mirror::Object* holder, 52597509954404d031594b2ecbda607314d169d512eMathieu Chartier MemberOffset offset) { 5260e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (obj != nullptr) { 527eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MarkObjectNonNull(obj, holder, offset); 5280e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } else if (kCountMarkedObjects) { 5290e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_null_count_; 53069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 53169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 53269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 533bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass VerifyRootMarkedVisitor : public SingleRootVisitor { 534bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier public: 535bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier explicit VerifyRootMarkedVisitor(MarkSweep* collector) : collector_(collector) { } 536ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 537bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE 53890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 53997509954404d031594b2ecbda607314d169d512eMathieu Chartier CHECK(collector_->IsMarked(root) != nullptr) << info.ToString(); 540bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 541bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 542bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier private: 543bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkSweep* const collector_; 544bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier}; 545893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier 5461ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartiervoid MarkSweep::VisitRoots(mirror::Object*** roots, 5471ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t count, 548bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) { 549bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 550bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkObjectNonNull(*roots[i]); 551bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 552815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier} 553815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier 5541ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartiervoid MarkSweep::VisitRoots(mirror::CompressedReference<mirror::Object>** roots, 5551ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t count, 556bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) { 557bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 558bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkObjectNonNull(roots[i]->AsMirrorPtr()); 559bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 5606f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5616f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 562bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass VerifyRootVisitor : public SingleRootVisitor { 563bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier public: 564bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE 56590443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 5669086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier // See if the root is on any space bitmap. 5679086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier auto* heap = Runtime::Current()->GetHeap(); 5689086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier if (heap->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == nullptr) { 5699086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier space::LargeObjectSpace* large_object_space = heap->GetLargeObjectsSpace(); 5709086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier if (large_object_space != nullptr && !large_object_space->Contains(root)) { 571175746ac9039e9b741d3521420dcaa9c59341738Mathieu Chartier LOG(INTERNAL_FATAL) << "Found invalid root: " << root << " " << info; 5729086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier } 5736f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5746f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5759086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier}; 5766f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 5776f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRoots() { 5789086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier VerifyRootVisitor visitor; 579bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->GetThreadList()->VisitRoots(&visitor); 5806f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5816f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 582893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkRoots(Thread* self) { 583f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 584893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 585893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // If we exclusively hold the mutator lock, all threads must be suspended. 586bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(this); 587893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 588893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } else { 5890f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, kRevokeRosAllocThreadLocalBuffersAtCheckpoint); 590893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // At this point the live stack should no longer have any mutators which push into it. 591893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkNonThreadRoots(); 592893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 593893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagAllRoots | kVisitRootFlagStartLoggingNewRoots)); 594893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 5959ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier} 5969ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier 597858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartiervoid MarkSweep::MarkNonThreadRoots() { 598f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 599bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitNonThreadRoots(this); 600858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 601858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 602893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkConcurrentRoots(VisitRootFlags flags) { 603f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 6041d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Visit all runtime roots and clear dirty flags. 6054edd8476339fd93ba8ff384ad107f1fc662e64a3Mathieu Chartier Runtime::Current()->VisitConcurrentRoots( 6064edd8476339fd93ba8ff384ad107f1fc662e64a3Mathieu Chartier this, static_cast<VisitRootFlags>(flags | kVisitRootFlagNonMoving)); 60769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 60869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 60902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass ScanObjectVisitor { 610cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier public: 61194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE 61294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep) {} 613cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 6141ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier void operator()(mirror::Object* obj) const 6151ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE 6161ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 6171ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 61894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 6192b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 6202b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 6212b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 62202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_sweep_->ScanObject(obj); 623cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 624cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 625cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier private: 626cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier MarkSweep* const mark_sweep_; 627cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 628cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 629407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartierclass DelayReferenceReferentVisitor { 630407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 6311ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier explicit DelayReferenceReferentVisitor(MarkSweep* collector) : collector_(collector) {} 632407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 633407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(mirror::Class* klass, mirror::Reference* ref) const 6341ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 6351ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 636407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier collector_->DelayReferenceReferent(klass, ref); 637407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 638407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 639407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 640407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const collector_; 641407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier}; 642407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 64394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiertemplate <bool kUseFinger = false> 64494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass MarkStackTask : public Task { 64594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 6461ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MarkStackTask(ThreadPool* thread_pool, 6471ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MarkSweep* mark_sweep, 6481ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t mark_stack_size, 64997509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack) 65094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep), 65194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_(thread_pool), 65294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_(mark_stack_size) { 65394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We may have to copy part of an existing mark stack when another mark stack overflows. 65494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_size != 0) { 6552cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier DCHECK(mark_stack != nullptr); 65694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Check performance? 65794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier std::copy(mark_stack, mark_stack + mark_stack_size, mark_stack_); 65894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 65994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 66094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_created_; 6611d54e73444e017d3a65234e0f193846f3e27472bIan Rogers } 662262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier } 663262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 66494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kMaxSize = 1 * KB; 665cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 66694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 667407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier class MarkObjectParallelVisitor { 668407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 6693887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain ALWAYS_INLINE MarkObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task, 6703887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain MarkSweep* mark_sweep) 671da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier : chunk_task_(chunk_task), mark_sweep_(mark_sweep) {} 672da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 6731ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE void operator()(mirror::Object* obj, 6741ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MemberOffset offset, 6751ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier bool is_static ATTRIBUTE_UNUSED) const 6761ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 677da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Mark(obj->GetFieldObject<mirror::Object>(offset)); 678da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 679407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 680da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const 68190443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 682da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (!root->IsNull()) { 683da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier VisitRoot(root); 684da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 685da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 686da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 687da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const 688da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 689da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (kCheckLocks) { 690da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 691da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 692da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 693da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Mark(root->AsMirrorPtr()); 694da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 695da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 696da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier private: 6971ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE void Mark(mirror::Object* ref) const SHARED_REQUIRES(Locks::mutator_lock_) { 698407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (ref != nullptr && mark_sweep_->MarkObjectParallel(ref)) { 699407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (kUseFinger) { 700c7df66e2cb124d261cf3b0691a09a3b6e357b6f1Yabin Cui std::atomic_thread_fence(std::memory_order_seq_cst); 701407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (reinterpret_cast<uintptr_t>(ref) >= 7023e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers static_cast<uintptr_t>(mark_sweep_->atomic_finger_.LoadRelaxed())) { 703407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier return; 704407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 705407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 706407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier chunk_task_->MarkStackPush(ref); 707407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 708407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 709407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 710407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 711407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep_; 712407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier }; 713407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 71494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier class ScanObjectParallelVisitor { 71594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 7161ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE explicit ScanObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task) 71794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : chunk_task_(chunk_task) {} 71894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 719407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier // No thread safety analysis since multiple threads will use this visitor. 7201ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier void operator()(mirror::Object* obj) const 7211ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 7221ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 723407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep = chunk_task_->mark_sweep_; 724407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectParallelVisitor mark_visitor(chunk_task_, mark_sweep); 725407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(mark_sweep); 726407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mark_sweep->ScanObjectVisit(obj, mark_visitor, ref_visitor); 72794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 72894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 72994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier private: 73094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 73194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier }; 73294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 73394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual ~MarkStackTask() { 73494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Make sure that we have cleared our mark stack. 73594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_EQ(mark_stack_pos_, 0U); 73694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 73794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_deleted_; 7382b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 739cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 740cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 74194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkSweep* const mark_sweep_; 74294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* const thread_pool_; 74394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Thread local mark stack for this task. 74497509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object> mark_stack_[kMaxSize]; 74594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack position. 74694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_pos_; 74794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 74897509954404d031594b2ecbda607314d169d512eMathieu Chartier ALWAYS_INLINE void MarkStackPush(mirror::Object* obj) 74990443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 75094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == kMaxSize)) { 75194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack overflow, give 1/2 the stack to the thread pool as a new work task. 75294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_ /= 2; 7531ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier auto* task = new MarkStackTask(thread_pool_, 7541ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_sweep_, 7551ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier kMaxSize - mark_stack_pos_, 75694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_ + mark_stack_pos_); 75794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_->AddTask(Thread::Current(), task); 75894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 75994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != nullptr); 7600e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_LT(mark_stack_pos_, kMaxSize); 761cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier mark_stack_[mark_stack_pos_++].Assign(obj); 76294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 76394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 76494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 76594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 76694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 76794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 76894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 7691ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier virtual void Run(Thread* self ATTRIBUTE_UNUSED) 7701ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 7711ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 77294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 77394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 77494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 77597509954404d031594b2ecbda607314d169d512eMathieu Chartier BoundedFifoPowerOfTwo<mirror::Object*, kFifoSize> prefetch_fifo; 77694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (;;) { 77797509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* obj = nullptr; 77894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 77994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (mark_stack_pos_ != 0 && prefetch_fifo.size() < kFifoSize) { 78097509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const mark_stack_obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); 781277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe DCHECK(mark_stack_obj != nullptr); 782277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe __builtin_prefetch(mark_stack_obj); 783277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe prefetch_fifo.push_back(mark_stack_obj); 78494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 78594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(prefetch_fifo.empty())) { 78694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 78794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 78894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 78994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 79094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 79194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == 0)) { 79294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 79394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 794cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); 79594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 79611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 7970e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier visitor(obj); 79894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 79994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 80094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 80194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 80294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass CardScanTask : public MarkStackTask<false> { 80394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 8041ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier CardScanTask(ThreadPool* thread_pool, 8051ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MarkSweep* mark_sweep, 806a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, 8071ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uint8_t* begin, 8081ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uint8_t* end, 8091ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uint8_t minimum_age, 8101ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t mark_stack_size, 8111ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier StackReference<mirror::Object>* mark_stack_obj, 8121ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier bool clear_card) 81394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, mark_stack_size, mark_stack_obj), 81494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 81594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 81694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end), 8171ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier minimum_age_(minimum_age), 8181ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier clear_card_(clear_card) {} 81994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 82094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 821a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 82213735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const begin_; 82313735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const end_; 82413735955f39b3b304c37d2b2840663c131262c18Ian Rogers const uint8_t minimum_age_; 825727b294b4091cf3cc2f8137cd654552f477fe46aLei Li const bool clear_card_; 82694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 82794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 82894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 82994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 83094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 83194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 83294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 83394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = mark_sweep_->GetHeap()->GetCardTable(); 8341ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t cards_scanned = clear_card_ 8351ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ? card_table->Scan<true>(bitmap_, begin_, end_, visitor, minimum_age_) 8361ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier : card_table->Scan<false>(bitmap_, begin_, end_, visitor, minimum_age_); 8370f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier VLOG(heap) << "Parallel scanning cards " << reinterpret_cast<void*>(begin_) << " - " 8380f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier << reinterpret_cast<void*>(end_) << " = " << cards_scanned; 83994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 84094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 84194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 842cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 843cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 8442775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiersize_t MarkSweep::GetThreadCount(bool paused) const { 8452775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (heap_->GetThreadPool() == nullptr || !heap_->CareAboutPauseTimes()) { 846bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return 1; 8472775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 84810d6886c9ce3ed87431cf10d376a69c23950fa61Mathieu Chartier return (paused ? heap_->GetParallelGCThreadCount() : heap_->GetConcGCThreadCount()) + 1; 8492775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier} 8502775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier 85113735955f39b3b304c37d2b2840663c131262c18Ian Rogersvoid MarkSweep::ScanGrayObjects(bool paused, uint8_t minimum_age) { 85294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = GetHeap()->GetCardTable(); 85394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 8542775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 8552775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier // The parallel version with only one thread is faster for card scanning, TODO: fix. 856bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kParallelCardScan && thread_count > 1) { 857720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 85894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Can't have a different split for each space since multiple spaces can have their cards being 85994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // scanned at the same time. 860f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(paused ? "(Paused)ScanGrayObjects" : __FUNCTION__, 861f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier GetTimings()); 86294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Try to take some of the mark stack since we can pass this off to the worker tasks. 86397509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack_begin = mark_stack_->Begin(); 86497509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack_end = mark_stack_->End(); 865720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier const size_t mark_stack_size = mark_stack_end - mark_stack_begin; 86694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Estimated number of work tasks we will create. 86794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_tasks = GetHeap()->GetContinuousSpaces().size() * thread_count; 86894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_NE(mark_stack_tasks, 0U); 86994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_delta = std::min(CardScanTask::kMaxSize / 2, 87094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_size / mark_stack_tasks + 1); 87194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 872590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() == nullptr) { 873590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 874590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 87513735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* card_begin = space->Begin(); 87613735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* card_end = space->End(); 8770941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Align up the end address. For example, the image space's end 8780941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // may not be card-size-aligned. 8790941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi card_end = AlignUp(card_end, accounting::CardTable::kCardSize); 88014d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(card_begin, accounting::CardTable::kCardSize); 88114d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(card_end, accounting::CardTable::kCardSize); 88294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how many bytes of heap we will scan, 88394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t address_range = card_end - card_begin; 88494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how much address range each task gets. 88594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t card_delta = RoundUp(address_range / thread_count + 1, 88694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable::kCardSize); 887727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // If paused and the space is neither zygote nor image space, we could clear the dirty 888727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // cards to avoid accumulating them to increase card scanning load in the following GC 889727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // cycles. We need to keep dirty cards of image space and zygote space in order to track 890727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // references to the other spaces. 891727b294b4091cf3cc2f8137cd654552f477fe46aLei Li bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); 89294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create the worker tasks for this space. 89394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (card_begin != card_end) { 89494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add a range of cards. 89594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t addr_remaining = card_end - card_begin; 89694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t card_increment = std::min(card_delta, addr_remaining); 89794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Take from the back of the mark stack. 89894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_remaining = mark_stack_end - mark_stack_begin; 89994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining); 90094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_end -= mark_stack_increment; 90194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment)); 9020e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_EQ(mark_stack_end, mark_stack_->End()); 90394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add the new task to the thread pool. 9041ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier auto* task = new CardScanTask(thread_pool, 9051ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier this, 9061ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->GetMarkBitmap(), 9071ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier card_begin, 9081ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier card_begin + card_increment, 9091ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier minimum_age, 9101ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_stack_increment, 9111ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier mark_stack_end, 9121ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier clear_card); 91394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 91494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin += card_increment; 91594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 91694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 9170f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 9180941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Note: the card scan below may dirty new cards (and scan them) 9190941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // as a side effect when a Reference object is encountered and 9200941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // queued during the marking. See b/11465268. 9212775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 92294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 9232775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 92494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 92594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 92694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 927590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() != nullptr) { 928590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Image spaces are handled properly since live == marked for them. 929f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier const char* name = nullptr; 930590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier switch (space->GetGcRetentionPolicy()) { 931f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyNeverCollect: 932f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayImageSpaceObjects" : "ScanGrayImageSpaceObjects"; 933f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 934f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyFullCollect: 935f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayZygoteSpaceObjects" : "ScanGrayZygoteSpaceObjects"; 936f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 937f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyAlwaysCollect: 938f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayAllocSpaceObjects" : "ScanGrayAllocSpaceObjects"; 939f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 940f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier default: 941f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier LOG(FATAL) << "Unreachable"; 9422c4257be8191c5eefde744e8965fcefc80a0a97dIan Rogers UNREACHABLE(); 943f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 944f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(name, GetTimings()); 945590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier ScanObjectVisitor visitor(this); 946727b294b4091cf3cc2f8137cd654552f477fe46aLei Li bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); 947727b294b4091cf3cc2f8137cd654552f477fe46aLei Li if (clear_card) { 9481ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier card_table->Scan<true>(space->GetMarkBitmap(), 9491ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->Begin(), 9501ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->End(), 9511ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier visitor, 952727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age); 953727b294b4091cf3cc2f8137cd654552f477fe46aLei Li } else { 9541ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier card_table->Scan<false>(space->GetMarkBitmap(), 9551ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->Begin(), 9561ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier space->End(), 9571ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier visitor, 958727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age); 959727b294b4091cf3cc2f8137cd654552f477fe46aLei Li } 960590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 96194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 96294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 96394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier} 96494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 96594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass RecursiveMarkTask : public MarkStackTask<false> { 96694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 9671ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier RecursiveMarkTask(ThreadPool* thread_pool, 9681ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MarkSweep* mark_sweep, 9691ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, 9701ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uintptr_t begin, 9711ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier uintptr_t end) 9721ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, 0, nullptr), 9731ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier bitmap_(bitmap), 9741ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier begin_(begin), 9751ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier end_(end) {} 97694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 97794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 978a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 97994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t begin_; 98094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t end_; 98194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 98294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 98394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 98494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 98594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 98694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 98794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 98894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 98994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_->VisitMarkedRange(begin_, end_, visitor); 99094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 99194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 99294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 99394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 99494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 99558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// Populates the mark stack based on the set of marked objects and 99658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// recursively marks until the mark stack is emptied. 9972b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::RecursiveMark() { 998f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 999a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // RecursiveMark will build the lists of known instances of the Reference classes. See 1000a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // DelayReferenceReferent for details. 100194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseRecursiveMark) { 100294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const bool partial = GetGcType() == kGcTypePartial; 100394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectVisitor scan_visitor(this); 100494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* self = Thread::Current(); 100594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = heap_->GetThreadPool(); 10062775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(false); 10072775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const bool parallel = kParallelRecursiveMark && thread_count > 1; 100894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->Reset(); 100902e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 10101d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if ((space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) || 10111d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (!partial && space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) { 10120e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = space->GetMarkBitmap(); 10130e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_ == nullptr) { 1014590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 10152b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 101694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (parallel) { 101794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We will use the mark stack the future. 101894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // CHECK(mark_stack_->IsEmpty()); 101994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 102094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 102194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 10223e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers atomic_finger_.StoreRelaxed(AtomicInteger::MaxValue()); 102394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 102494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create a few worker tasks. 10252775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t n = thread_count * 2; 102694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (begin != end) { 102794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t start = begin; 102894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t delta = (end - begin) / n; 102994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delta = RoundUp(delta, KB); 103094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (delta < 16 * KB) delta = end - begin; 103194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin += delta; 10321ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier auto* task = new RecursiveMarkTask(thread_pool, 10331ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier this, 10341ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier current_space_bitmap_, 10351ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier start, 103694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin); 103794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 103894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 10392775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 104094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 10412775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 104294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 104394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 104494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 104594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 104694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 10470e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_->VisitMarkedRange(begin, end, scan_visitor); 104894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 1049357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1050357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1051357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 105294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(false); 105358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 105458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 105513735955f39b3b304c37d2b2840663c131262c18Ian Rogersvoid MarkSweep::RecursiveMarkDirtyObjects(bool paused, uint8_t minimum_age) { 105694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanGrayObjects(paused, minimum_age); 105794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(paused); 1058262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier} 1059262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 106058551df3c2646ed507feec9e9eb3768085a76059Carl Shapirovoid MarkSweep::ReMarkRoots() { 1061f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1062893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(Thread::Current()); 1063bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(this, static_cast<VisitRootFlags>( 1064bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier kVisitRootFlagNewRoots | kVisitRootFlagStopLoggingNewRoots | kVisitRootFlagClearRootLog)); 10657bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier if (kVerifyRootsMarked) { 1066277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("(Paused)VerifyRoots", GetTimings()); 1067bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier VerifyRootMarkedVisitor visitor(this); 1068bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(&visitor); 1069893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 107058551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 107158551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 10720f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::SweepSystemWeaks(Thread* self) { 1073f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 107414c3bf91b2ec434295ec84d6446f495fb7de6d5cMathieu Chartier ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 107597509954404d031594b2ecbda607314d169d512eMathieu Chartier Runtime::Current()->SweepSystemWeaks(this); 107669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 107769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 107897509954404d031594b2ecbda607314d169d512eMathieu Chartierclass VerifySystemWeakVisitor : public IsMarkedVisitor { 107997509954404d031594b2ecbda607314d169d512eMathieu Chartier public: 108097509954404d031594b2ecbda607314d169d512eMathieu Chartier explicit VerifySystemWeakVisitor(MarkSweep* mark_sweep) : mark_sweep_(mark_sweep) {} 108197509954404d031594b2ecbda607314d169d512eMathieu Chartier 10821ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier virtual mirror::Object* IsMarked(mirror::Object* obj) 10831ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier OVERRIDE 108490443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 108597509954404d031594b2ecbda607314d169d512eMathieu Chartier mark_sweep_->VerifyIsLive(obj); 108697509954404d031594b2ecbda607314d169d512eMathieu Chartier return obj; 108797509954404d031594b2ecbda607314d169d512eMathieu Chartier } 108897509954404d031594b2ecbda607314d169d512eMathieu Chartier 108997509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkSweep* const mark_sweep_; 109097509954404d031594b2ecbda607314d169d512eMathieu Chartier}; 1091c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 109297509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::VerifyIsLive(const mirror::Object* obj) { 10934aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier if (!heap_->GetLiveBitmap()->Test(obj)) { 1094cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier // TODO: Consider live stack? Has this code bitrotted? 1095cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier CHECK(!heap_->allocation_stack_->Contains(obj)) 1096cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier << "Found dead object " << obj << "\n" << heap_->DumpSpaces(); 1097c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 1098c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1099c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1100c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifySystemWeaks() { 1101f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 11026aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier // Verify system weaks, uses a special object visitor which returns the input object. 110397509954404d031594b2ecbda607314d169d512eMathieu Chartier VerifySystemWeakVisitor visitor(this); 110497509954404d031594b2ecbda607314d169d512eMathieu Chartier Runtime::Current()->SweepSystemWeaks(&visitor); 1105c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1106c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1107bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass CheckpointMarkThreadRoots : public Closure, public RootVisitor { 1108858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier public: 11093887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain CheckpointMarkThreadRoots(MarkSweep* mark_sweep, 11103887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) 11110f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier : mark_sweep_(mark_sweep), 11120f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint_( 11130f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 11140f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier } 1115858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1116bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoots(mirror::Object*** roots, size_t count, const RootInfo& info ATTRIBUTE_UNUSED) 111790443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) 111890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 1119bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 1120bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier mark_sweep_->MarkObjectNonNullParallel(*roots[i]); 1121bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1122bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1123bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 11241ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier void VisitRoots(mirror::CompressedReference<mirror::Object>** roots, 11251ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier size_t count, 1126bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) 112790443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) 112890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 1129bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 1130bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier mark_sweep_->MarkObjectNonNullParallel(roots[i]->AsMirrorPtr()); 1131bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1132bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1133bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 11344aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier virtual void Run(Thread* thread) OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 11353f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_BEGIN("Marking thread roots"); 1136858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier // Note: self is not necessarily equal to thread since thread may be suspended. 1137bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Thread* const self = Thread::Current(); 1138d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier CHECK(thread == self || thread->IsSuspended() || thread->GetState() == kWaitingPerformingGc) 1139d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << thread->GetState() << " thread " << thread << " self " << self; 1140bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier thread->VisitRoots(this); 11413f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_END(); 11420f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (revoke_ros_alloc_thread_local_buffers_at_checkpoint_) { 11430f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_BEGIN("RevokeRosAllocThreadLocalBuffers"); 1144c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi mark_sweep_->GetHeap()->RevokeRosAllocThreadLocalBuffers(thread); 11450f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_END(); 1146c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1147dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // If thread is a running mutator, then act on behalf of the garbage collector. 1148dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // See the code in ThreadList::RunCheckpoint. 1149dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li if (thread->GetState() == kRunnable) { 1150dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li mark_sweep_->GetBarrier().Pass(self); 1151dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li } 1152858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier } 1153858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1154858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier private: 11554aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier MarkSweep* const mark_sweep_; 11560f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier const bool revoke_ros_alloc_thread_local_buffers_at_checkpoint_; 1157858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier}; 1158858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 11590f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::MarkRootsCheckpoint(Thread* self, 11600f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 1161f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 11620f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CheckpointMarkThreadRoots check_point(this, revoke_ros_alloc_thread_local_buffers_at_checkpoint); 1163858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 11641d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Request the check point is run on all threads returning a count of the threads that must 11651d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // run through the barrier including self. 11661d54e73444e017d3a65234e0f193846f3e27472bIan Rogers size_t barrier_count = thread_list->RunCheckpoint(&check_point); 11671d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Release locks then wait for all mutator threads to pass the barrier. 1168dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // If there are no threads to wait which implys that all the checkpoint functions are finished, 1169dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // then no need to release locks. 1170dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li if (barrier_count == 0) { 1171dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li return; 1172dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li } 11731d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 11741d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedUnlock(self); 11754aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier { 11764aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier ScopedThreadStateChange tsc(self, kWaitingForCheckPointsToRun); 11774aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier gc_barrier_->Increment(self, barrier_count); 11784aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier } 11791d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedLock(self); 11801d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveLock(self); 1181858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 1182858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 11831d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::SweepArray(accounting::ObjectStack* allocations, bool swap_bitmaps) { 1184f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1185e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Thread* self = Thread::Current(); 1186bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi mirror::Object** chunk_free_buffer = reinterpret_cast<mirror::Object**>( 1187bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi sweep_array_free_buffer_mem_map_->BaseBegin()); 1188e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t chunk_free_pos = 0; 118910fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier ObjectBytePair freed; 119010fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier ObjectBytePair freed_los; 1191e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // How many objects are left in the array, modified after each space is swept. 119297509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* objects = allocations->Begin(); 1193e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t count = allocations->Size(); 1194e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Change the order to ensure that the non-moving space last swept as an optimization. 1195e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::vector<space::ContinuousSpace*> sweep_spaces; 1196e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::ContinuousSpace* non_moving_space = nullptr; 1197e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : heap_->GetContinuousSpaces()) { 11988d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (space->IsAllocSpace() && !immune_region_.ContainsSpace(space) && 11998d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier space->GetLiveBitmap() != nullptr) { 1200e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space == heap_->GetNonMovingSpace()) { 1201e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier non_moving_space = space; 1202e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1203e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(space); 1204e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1205e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1206e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1207e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Unlikely to sweep a significant amount of non_movable objects, so we do these after the after 1208e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the other alloc spaces as an optimization. 1209e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (non_moving_space != nullptr) { 1210e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(non_moving_space); 1211e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1212e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Start by sweeping the continuous spaces. 1213e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : sweep_spaces) { 1214e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::AllocSpace* alloc_space = space->AsAllocSpace(); 1215a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* live_bitmap = space->GetLiveBitmap(); 1216a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); 1217e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (swap_bitmaps) { 1218e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::swap(live_bitmap, mark_bitmap); 1219e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 122097509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* out = objects; 1221e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (size_t i = 0; i < count; ++i) { 122297509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const obj = objects[i].AsMirrorPtr(); 1223f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1224f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1225f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1226e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space->HasAddress(obj)) { 1227e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // This object is in the space, remove it from the array and add it to the sweep buffer 1228e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // if needed. 1229e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!mark_bitmap->Test(obj)) { 1230e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos >= kSweepArrayChunkFreeSize) { 1231277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("FreeList", GetTimings()); 123210fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.objects += chunk_free_pos; 123310fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1234e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1235e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1236e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_buffer[chunk_free_pos++] = obj; 1237e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1238e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1239cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier (out++)->Assign(obj); 1240e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1241e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1242e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos > 0) { 1243277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("FreeList", GetTimings()); 124410fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.objects += chunk_free_pos; 124510fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1246e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1247e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1248e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // All of the references which space contained are no longer in the allocation stack, update 1249e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the count. 1250e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier count = out - objects; 1251e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1252e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle the large object space. 12531d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 12542dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (large_object_space != nullptr) { 12552dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier accounting::LargeObjectBitmap* large_live_objects = large_object_space->GetLiveBitmap(); 12562dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier accounting::LargeObjectBitmap* large_mark_objects = large_object_space->GetMarkBitmap(); 12572dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (swap_bitmaps) { 12582dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier std::swap(large_live_objects, large_mark_objects); 1259f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 12602dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier for (size_t i = 0; i < count; ++i) { 126197509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const obj = objects[i].AsMirrorPtr(); 12622dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier // Handle large objects. 12632dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (kUseThreadLocalAllocationStack && obj == nullptr) { 12642dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier continue; 12652dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 12662dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (!large_mark_objects->Test(obj)) { 12672dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier ++freed_los.objects; 12682dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier freed_los.bytes += large_object_space->Free(self, obj); 12692dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 1270357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1271357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1272f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier { 1273277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("RecordFree", GetTimings()); 1274f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier RecordFree(freed); 1275f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier RecordFreeLOS(freed_los); 1276277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe t2.NewTiming("ResetStack"); 1277f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier allocations->Reset(); 1278f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 1279c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers sweep_array_free_buffer_mem_map_->MadviseDontNeedAndZero(); 1280357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 1281357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 12821d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::Sweep(bool swap_bitmaps) { 1283f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 12840f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Ensure that nobody inserted items in the live stack after we swapped the stacks. 12850f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CHECK_GE(live_stack_freeze_size_, GetHeap()->GetLiveStack()->Size()); 1286f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier { 1287f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t2("MarkAllocStackAsLive", GetTimings()); 1288f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier // Mark everything allocated since the last as GC live so that we can sweep concurrently, 1289f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier // knowing that new allocations won't be marked as live. 1290f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier accounting::ObjectStack* live_stack = heap_->GetLiveStack(); 1291f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier heap_->MarkAllocStackAsLive(live_stack); 1292f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier live_stack->Reset(); 1293f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier DCHECK(mark_stack_->IsEmpty()); 1294f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 129502e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1296a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier if (space->IsContinuousMemMapAllocSpace()) { 1297a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); 1298f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming split( 12991ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier alloc_space->IsZygoteSpace() ? "SweepZygoteSpace" : "SweepMallocSpace", 13001ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier GetTimings()); 130110fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier RecordFree(alloc_space->Sweep(swap_bitmaps)); 130258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 130358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 13042b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SweepLargeObjects(swap_bitmaps); 130558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 130658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 1307e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartiervoid MarkSweep::SweepLargeObjects(bool swap_bitmaps) { 13082dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier space::LargeObjectSpace* los = heap_->GetLargeObjectsSpace(); 13092dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (los != nullptr) { 13102dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier TimingLogger::ScopedTiming split(__FUNCTION__, GetTimings()); 13112dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier RecordFreeLOS(los->Sweep(swap_bitmaps)); 13122dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 1313e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier} 1314e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier 1315407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// Process the "referent" field in a java.lang.ref.Reference. If the referent has not yet been 1316407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// marked, put it on the appropriate list in the heap for later processing. 1317407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::DelayReferenceReferent(mirror::Class* klass, mirror::Reference* ref) { 131897509954404d031594b2ecbda607314d169d512eMathieu Chartier heap_->GetReferenceProcessor()->DelayReferenceReferent(klass, ref, this); 131969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 132069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 132197509954404d031594b2ecbda607314d169d512eMathieu Chartierclass MarkVisitor { 132202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier public: 13231ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE explicit MarkVisitor(MarkSweep* const mark_sweep) : mark_sweep_(mark_sweep) {} 132402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 13251ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier ALWAYS_INLINE void operator()(mirror::Object* obj, 13261ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier MemberOffset offset, 13271ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier bool is_static ATTRIBUTE_UNUSED) const 13281ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 13291ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 133094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 13312b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 13322b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 13332b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1334eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi mark_sweep_->MarkObject(obj->GetFieldObject<mirror::Object>(offset), obj, offset); 133502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 133602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 1337da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const 13381ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 13391ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 1340da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (!root->IsNull()) { 1341da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier VisitRoot(root); 1342da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1343da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1344da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 1345da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const 13461ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) 13471ac1c2bba3ff0835cbae4753621f38dc935ebd91Mathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 1348da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (kCheckLocks) { 1349da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 1350da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 1351da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1352da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier mark_sweep_->MarkObject(root->AsMirrorPtr()); 1353da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1354da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 135502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier private: 135602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MarkSweep* const mark_sweep_; 135702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier}; 135802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 135969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Scans an object reference. Determines the type of the reference 136069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// and dispatches to a specialized scanning routine. 136197509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::ScanObject(mirror::Object* obj) { 136297509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkVisitor mark_visitor(this); 1363407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(this); 1364407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ScanObjectVisit(obj, mark_visitor, ref_visitor); 136502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 136602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 13672775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiervoid MarkSweep::ProcessMarkStackParallel(size_t thread_count) { 136802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier Thread* self = Thread::Current(); 136902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 13702775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t chunk_size = std::min(mark_stack_->Size() / thread_count + 1, 13712775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier static_cast<size_t>(MarkStackTask<false>::kMaxSize)); 137294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier CHECK_GT(chunk_size, 0U); 137394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Split the current mark stack up into work tasks. 1374cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier for (auto* it = mark_stack_->Begin(), *end = mark_stack_->End(); it < end; ) { 137594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t delta = std::min(static_cast<size_t>(end - it), chunk_size); 13760e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier thread_pool->AddTask(self, new MarkStackTask<false>(thread_pool, this, delta, it)); 137794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier it += delta; 137802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 13792775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 138002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier thread_pool->StartWorkers(self); 13812775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 138294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 138302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_stack_->Reset(); 13843e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers CHECK_EQ(work_chunks_created_.LoadSequentiallyConsistent(), 13853e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_deleted_.LoadSequentiallyConsistent()) 13863e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " some of the work chunks were leaked"; 138769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 138869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 13895d76c435082332ef79a22962386fa92a0870e378Ian Rogers// Scan anything that's on the mark stack. 139094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ProcessMarkStack(bool paused) { 1391f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(paused ? "(Paused)ProcessMarkStack" : __FUNCTION__, GetTimings()); 13922775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 13932775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelProcessMarkStack && thread_count > 1 && 13942775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier mark_stack_->Size() >= kMinimumParallelMarkStackSize) { 13952775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier ProcessMarkStackParallel(thread_count); 139694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 139794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 139894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 139997509954404d031594b2ecbda607314d169d512eMathieu Chartier BoundedFifoPowerOfTwo<mirror::Object*, kFifoSize> prefetch_fifo; 1400d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier for (;;) { 140197509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* obj = nullptr; 140294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 140394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (!mark_stack_->IsEmpty() && prefetch_fifo.size() < kFifoSize) { 140497509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* mark_stack_obj = mark_stack_->PopBack(); 14052cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier DCHECK(mark_stack_obj != nullptr); 1406277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe __builtin_prefetch(mark_stack_obj); 1407277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe prefetch_fifo.push_back(mark_stack_obj); 140894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 140994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (prefetch_fifo.empty()) { 141094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 141194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 141294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 141394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 141494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 141594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_->IsEmpty()) { 141694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 141794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 141894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_->PopBack(); 1419d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier } 14204aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier DCHECK(obj != nullptr); 1421d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier ScanObject(obj); 1422357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1423357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 142469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 142569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 142697509954404d031594b2ecbda607314d169d512eMathieu Chartierinline mirror::Object* MarkSweep::IsMarked(mirror::Object* object) { 14278d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(object)) { 142897509954404d031594b2ecbda607314d169d512eMathieu Chartier return object; 14297469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 14300e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_->HasAddress(object)) { 143197509954404d031594b2ecbda607314d169d512eMathieu Chartier return current_space_bitmap_->Test(object) ? object : nullptr; 14327469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 143397509954404d031594b2ecbda607314d169d512eMathieu Chartier return mark_bitmap_->Test(object) ? object : nullptr; 14347469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier} 14357469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier 14362b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::FinishPhase() { 1437f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1438d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountScannedTypes) { 143952a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier VLOG(gc) 144052a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << "MarkSweep scanned" 144152a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " no reference objects=" << no_reference_class_count_.LoadRelaxed() 144252a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " normal objects=" << normal_count_.LoadRelaxed() 144352a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " classes=" << class_count_.LoadRelaxed() 144452a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " object arrays=" << object_array_count_.LoadRelaxed() 144552a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " references=" << reference_count_.LoadRelaxed() 144652a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " other=" << other_count_.LoadRelaxed(); 144702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 144802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kCountTasks) { 14493e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Total number of work chunks allocated: " << work_chunks_created_.LoadRelaxed(); 145002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 145102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kMeasureOverhead) { 14523e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Overhead time " << PrettyDuration(overhead_time_.LoadRelaxed()); 145302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 145402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 14553e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Large objects tested " << large_object_test_.LoadRelaxed() 14563e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " marked " << large_object_mark_.LoadRelaxed(); 145702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 14580e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 14593e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Marked: null=" << mark_null_count_.LoadRelaxed() 14603e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " immune=" << mark_immune_count_.LoadRelaxed() 14613e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " fastpath=" << mark_fastpath_count_.LoadRelaxed() 14623e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " slowpath=" << mark_slowpath_count_.LoadRelaxed(); 14630e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 14644aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier CHECK(mark_stack_->IsEmpty()); // Ensure that the mark stack is empty. 14655301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier mark_stack_->Reset(); 14664aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 14674aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->ClearMarkedObjects(); 146869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 146969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 1470c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchivoid MarkSweep::RevokeAllThreadLocalBuffers() { 1471c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi if (kRevokeRosAllocThreadLocalBuffersAtCheckpoint && IsConcurrent()) { 1472c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // If concurrent, rosalloc thread-local buffers are revoked at the 1473c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // thread checkpoint. Bump pointer space thread-local buffers must 1474c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // not be in use. 1475c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->AssertAllBumpPointerSpaceThreadLocalBuffersAreRevoked(); 1476c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } else { 1477f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1478c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->RevokeAllThreadLocalBuffers(); 1479c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1480c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi} 1481c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 14821d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace collector 14831d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace gc 148469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} // namespace art 1485