mark_sweep.cc revision 4f55e22630d99ca0edd9e951e5ee96b57bb9b980
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")), 983e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers current_space_bitmap_(nullptr), mark_bitmap_(nullptr), mark_stack_(nullptr), 9935883cc623fdf475a4ead1dafcba9e9becc1ed11Mathieu Chartier gc_barrier_(new Barrier(0)), 100958291c7afe723d846a39539fd00410c102485f3Mathieu Chartier mark_stack_lock_("mark sweep mark stack lock", kMarkSweepMarkStackLock), 1013e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers is_concurrent_(is_concurrent), live_stack_freeze_size_(0) { 102bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi std::string error_msg; 103bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi MemMap* mem_map = MemMap::MapAnonymous( 104bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi "mark sweep sweep array free buffer", nullptr, 105bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi RoundUp(kSweepArrayChunkFreeSize * sizeof(mirror::Object*), kPageSize), 1065c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko PROT_READ | PROT_WRITE, false, false, &error_msg); 107bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi CHECK(mem_map != nullptr) << "Couldn't allocate sweep array free buffer: " << error_msg; 108bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi sweep_array_free_buffer_mem_map_.reset(mem_map); 1095301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier} 110b3bd5f07884f5a1f2b84224363b1372d7c28d447Elliott Hughes 1112b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::InitializePhase() { 112f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 113eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier mark_stack_ = heap_->GetMarkStack(); 114e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier DCHECK(mark_stack_ != nullptr); 1158d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier immune_region_.Reset(); 11652a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier no_reference_class_count_.StoreRelaxed(0); 11752a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier normal_count_.StoreRelaxed(0); 1183e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers class_count_.StoreRelaxed(0); 11952a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier object_array_count_.StoreRelaxed(0); 1203e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers other_count_.StoreRelaxed(0); 12152a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier reference_count_.StoreRelaxed(0); 1223e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers large_object_test_.StoreRelaxed(0); 1233e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers large_object_mark_.StoreRelaxed(0); 1243e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers overhead_time_ .StoreRelaxed(0); 1253e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_created_.StoreRelaxed(0); 1263e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_deleted_.StoreRelaxed(0); 1273e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_null_count_.StoreRelaxed(0); 1283e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_immune_count_.StoreRelaxed(0); 1293e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_fastpath_count_.StoreRelaxed(0); 1303e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_slowpath_count_.StoreRelaxed(0); 1310e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier { 132eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier // TODO: I don't think we should need heap bitmap lock to Get the mark bitmap. 1330e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 1340e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_bitmap_ = heap_->GetMarkBitmap(); 1350e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 13610fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier if (!GetCurrentIteration()->GetClearSoftReferences()) { 137df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi // Always clear soft references if a non-sticky collection. 13810fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier GetCurrentIteration()->SetClearSoftReferences(GetGcType() != collector::kGcTypeSticky); 139df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi } 1406f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier} 1416f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier 1426f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartiervoid MarkSweep::RunPhases() { 1436f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Thread* self = Thread::Current(); 1446f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier InitializePhase(); 1456f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Locks::mutator_lock_->AssertNotHeld(self); 1466f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier if (IsConcurrent()) { 1476f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerification(this); 1486f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1496f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1506f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1516f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1526f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1536f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1546f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1556f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1566f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } else { 1576f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1586f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerificationPaused(this); 1596f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1606f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1616f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1626f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1636f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1646f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1656f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Sweeping always done concurrently, even for non concurrent mark sweep. 1666f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1676f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReclaimPhase(); 1686f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1696f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PostGcVerification(this); 1706f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier FinishPhase(); 1712b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1722b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1732b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ProcessReferences(Thread* self) { 1748e56c7e41cb37e2eaf553503968a01ff893b135bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 17578f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->ProcessReferences( 17697509954404d031594b2ecbda607314d169d512eMathieu Chartier true, GetTimings(), GetCurrentIteration()->GetClearSoftReferences(), this); 1771ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier} 1781ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier 1790f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::PausePhase() { 180f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t("(Paused)PausePhase", GetTimings()); 1812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 1822b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 1830f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (IsConcurrent()) { 1840f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Handle the dirty objects if we are a concurrent GC. 1852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1862b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Re-mark root set. 1872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ReMarkRoots(); 1882b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Scan dirty objects, this is only required if we are not doing concurrent GC. 18994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkDirtyObjects(true, accounting::CardTable::kCardDirty); 1902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1910f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier { 192f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t2("SwapStacks", GetTimings()); 1932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 194a4f6af9b1e6380b31674d7ac645b1732c846ac06Mathieu Chartier heap_->SwapStacks(); 1950f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier live_stack_freeze_size_ = heap_->GetLiveStack()->Size(); 1960f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Need to revoke all the thread local allocation stacks since we just swapped the allocation 1970f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // stacks and don't want anybody to allocate into the live stack. 198c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 1992b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 2000f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier heap_->PreSweepingGcVerification(this); 2016f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Disallow new system weaks to prevent a race which occurs when someone adds a new system 2026f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // weak before we sweep them. Since this new system weak may not be marked, the GC may 2036f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // incorrectly sweep it. This also fixes a race where interning may attempt to return a strong 2046f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // reference to a string that is about to be swept. 2056f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Runtime::Current()->DisallowNewSystemWeaks(); 20678f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Enable the reference processing slow path, needs to be done with mutators paused since there 20778f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // is no lock in the GetReferent fast path. 20878f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->EnableSlowPath(); 2092b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2102b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 211dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartiervoid MarkSweep::PreCleanCards() { 212dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Don't do this for non concurrent GCs since they don't have any dirty cards. 213dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier if (kPreCleanCards && IsConcurrent()) { 214f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 215dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier Thread* self = Thread::Current(); 216dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier CHECK(!Locks::mutator_lock_->IsExclusiveHeld(self)); 217dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process dirty cards and add dirty cards to mod union tables, also ages cards. 2184add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li heap_->ProcessCards(GetTimings(), false, true, false); 219eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The checkpoint root marking is required to avoid a race condition which occurs if the 220eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // following happens during a reference write: 221eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 1. mutator dirties the card (write barrier) 222eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 2. GC ages the card (the above ProcessCards call) 223eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 3. GC scans the object (the RecursiveMarkDirtyObjects call below) 224eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 4. mutator writes the value (corresponding to the write barrier in 1.) 225eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // This causes the GC to age the card but not necessarily mark the reference which the mutator 226eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // wrote into the object stored in the card. 227eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // Having the checkpoint fixes this issue since it ensures that the card mark and the 228eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // reference write are visible to the GC before the card is scanned (this is due to locks being 229eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // acquired / released in the checkpoint code). 230eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The other roots are also marked to help reduce the pause. 2310f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, false); 232dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier MarkNonThreadRoots(); 233893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 234893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagClearRootLog | kVisitRootFlagNewRoots)); 235dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process the newly aged cards. 236dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier RecursiveMarkDirtyObjects(false, accounting::CardTable::kCardDirty - 1); 237dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // TODO: Empty allocation stack to reduce the number of objects we need to test / mark as live 238dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // in the next GC. 239dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier } 240dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier} 241dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier 242c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartiervoid MarkSweep::RevokeAllThreadLocalAllocationStacks(Thread* self) { 243c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier if (kUseThreadLocalAllocationStack) { 244f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 245c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 246c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier heap_->RevokeAllThreadLocalAllocationStacks(self); 247c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier } 248c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier} 249c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier 2502b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkingPhase() { 251f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 2522b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 2532b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier BindBitmaps(); 2540e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier FindDefaultSpaceBitmap(); 2552b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Process dirty cards and add dirty cards to mod union tables. 2564add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li // If the GC type is non sticky, then we just clear the cards instead of ageing them. 2574add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li heap_->ProcessCards(GetTimings(), false, true, GetGcType() != kGcTypeSticky); 2582b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 259893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkRoots(self); 2602b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkReachableObjects(); 261dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Pre-clean dirtied cards to reduce pauses. 262dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier PreCleanCards(); 2632b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2642b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 26511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartiervoid MarkSweep::UpdateAndMarkModUnion() { 26611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier for (const auto& space : heap_->GetContinuousSpaces()) { 2678d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsSpace(space)) { 26811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier const char* name = space->IsZygoteSpace() ? "UpdateAndMarkZygoteModUnionTable" : 26911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier "UpdateAndMarkImageModUnionTable"; 270f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(name, GetTimings()); 27111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier accounting::ModUnionTable* mod_union_table = heap_->FindModUnionTableFromSpace(space); 27211409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier CHECK(mod_union_table != nullptr); 27397509954404d031594b2ecbda607314d169d512eMathieu Chartier mod_union_table->UpdateAndMarkReferences(this); 27411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 27511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 27611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier} 27711409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier 2782b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkReachableObjects() { 2794aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier UpdateAndMarkModUnion(); 2802b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Recursively mark all the non-image bits set in the mark bitmap. 2812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier RecursiveMark(); 2822b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2842b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ReclaimPhase() { 285f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 286720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 28778f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Process the references concurrently. 28878f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier ProcessReferences(self); 2890f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier SweepSystemWeaks(self); 2906f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Runtime::Current()->AllowNewSystemWeaks(); 2912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier { 2922b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 2934460a84be92b5a94ecfb5c650aef4945ab849c93Hiroshi Yamauchi GetHeap()->RecordFreeRevoke(); 2942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Reclaim unmarked objects. 2951d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Sweep(false); 2962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Swap the live and mark bitmaps for each space which we modified space. This is an 2972b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // optimization that enables us to not clear live bits inside of the sweep. Only swaps unbound 2982b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // bitmaps. 2992b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SwapBitmaps(); 3002b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Unbind the live and mark bitmaps. 301a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier GetHeap()->UnBindBitmaps(); 3022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 3032b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 3042b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3050e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartiervoid MarkSweep::FindDefaultSpaceBitmap() { 306f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 30702e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 308a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap = space->GetMarkBitmap(); 309bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // We want to have the main space instead of non moving if possible. 310590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (bitmap != nullptr && 311590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) { 3120e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = bitmap; 313bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // If we are not the non moving space exit the loop early since this will be good enough. 314bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (space != heap_->GetNonMovingSpace()) { 315bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier break; 316bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 317b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 318b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 3194c13a3ff475f206c4d0a86ee2595c45392fd942fMathieu Chartier CHECK(current_space_bitmap_ != nullptr) << "Could not find a default mark bitmap\n" 3204c13a3ff475f206c4d0a86ee2595c45392fd942fMathieu Chartier << heap_->DumpSpaces(); 32158551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 32258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 323ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartiervoid MarkSweep::ExpandMarkStack() { 324ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier ResizeMarkStack(mark_stack_->Capacity() * 2); 325ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier} 326ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier 327ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartiervoid MarkSweep::ResizeMarkStack(size_t new_size) { 328ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Rare case, no need to have Thread::Current be a parameter. 329ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (UNLIKELY(mark_stack_->Size() < mark_stack_->Capacity())) { 330ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Someone else acquired the lock and expanded the mark stack before us. 331ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier return; 332ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 33397509954404d031594b2ecbda607314d169d512eMathieu Chartier std::vector<StackReference<mirror::Object>> temp(mark_stack_->Begin(), mark_stack_->End()); 334ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier CHECK_LE(mark_stack_->Size(), new_size); 335ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier mark_stack_->Resize(new_size); 336cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier for (auto& obj : temp) { 337cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier mark_stack_->PushBack(obj.AsMirrorPtr()); 338ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 339ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 340ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 341e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartiermirror::Object* MarkSweep::MarkObject(mirror::Object* obj) { 342e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier MarkObject(obj, nullptr, MemberOffset(0)); 343e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier return obj; 344e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier} 345e48a169605d8dc2b9af5ebe7c9c6af25f3b65dfeMathieu Chartier 34697509954404d031594b2ecbda607314d169d512eMathieu Chartierinline void MarkSweep::MarkObjectNonNullParallel(mirror::Object* obj) { 347bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(obj != nullptr); 348ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (MarkObjectParallel(obj)) { 349ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 350ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 351184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier ExpandMarkStack(); 352ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 353ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier // The object must be pushed on to the mark stack. 3540e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 355ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 356ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 357ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 35897509954404d031594b2ecbda607314d169d512eMathieu Chartierbool MarkSweep::IsMarkedHeapReference(mirror::HeapReference<mirror::Object>* ref) { 35997509954404d031594b2ecbda607314d169d512eMathieu Chartier return IsMarked(ref->AsMirrorPtr()); 360308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier} 361308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier 362bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartierclass MarkSweepMarkObjectSlowPath { 363bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier public: 36497509954404d031594b2ecbda607314d169d512eMathieu Chartier explicit MarkSweepMarkObjectSlowPath(MarkSweep* mark_sweep, mirror::Object* holder = nullptr, 365eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MemberOffset offset = MemberOffset(0)) 366eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi : mark_sweep_(mark_sweep), holder_(holder), offset_(offset) { 367bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 368bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 369da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void operator()(const mirror::Object* obj) const NO_THREAD_SAFETY_ANALYSIS { 370bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kProfileLargeObjects) { 371bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: Differentiate between marking and testing somehow. 372bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_test_; 373bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_mark_; 374bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 375bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier space::LargeObjectSpace* large_object_space = mark_sweep_->GetHeap()->GetLargeObjectsSpace(); 376a17288e3b9dd6751005fed3386251d2d0949be74Mathieu Chartier if (UNLIKELY(obj == nullptr || !IsAligned<kPageSize>(obj) || 3772dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier (kIsDebugBuild && large_object_space != nullptr && 3782dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier !large_object_space->Contains(obj)))) { 379175746ac9039e9b741d3521420dcaa9c59341738Mathieu Chartier LOG(INTERNAL_FATAL) << "Tried to mark " << obj << " not contained by any spaces"; 380eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi if (holder_ != nullptr) { 381d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi size_t holder_size = holder_->SizeOf(); 382eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi ArtField* field = holder_->FindFieldByOffset(offset_); 383d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi LOG(INTERNAL_FATAL) << "Field info: " 384d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " holder=" << holder_ 385679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << " holder is " 386679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << (mark_sweep_->GetHeap()->IsLiveObjectLocked(holder_) 387679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi ? "alive" : "dead") 388d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " holder_size=" << holder_size 389eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi << " holder_type=" << PrettyTypeOf(holder_) 390eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi << " offset=" << offset_.Uint32Value() 391d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " field=" << (field != nullptr ? field->GetName() : "nullptr") 392d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " field_type=" 393d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (field != nullptr ? field->GetTypeDescriptor() : "") 394d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " first_ref_field_offset=" 395d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (holder_->IsClass() 396e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier ? holder_->AsClass()->GetFirstReferenceStaticFieldOffset( 397e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier sizeof(void*)) 398d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi : holder_->GetClass()->GetFirstReferenceInstanceFieldOffset()) 399d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " num_of_ref_fields=" 400d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (holder_->IsClass() 401d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi ? holder_->AsClass()->NumReferenceStaticFields() 402d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi : holder_->GetClass()->NumReferenceInstanceFields()) 403d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << "\n"; 404679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi // Print the memory content of the holder. 405679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi for (size_t i = 0; i < holder_size / sizeof(uint32_t); ++i) { 406679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi uint32_t* p = reinterpret_cast<uint32_t*>(holder_); 407679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi LOG(INTERNAL_FATAL) << &p[i] << ": " << "holder+" << (i * sizeof(uint32_t)) << " = " 408679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << std::hex << p[i]; 409679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi } 410eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi } 411d38ec80b163af1639fbaae382a319c73be67c560Hiroshi Yamauchi PrintFileToLog("/proc/self/maps", LogSeverity::INTERNAL_FATAL); 41217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko MemMap::DumpMaps(LOG(INTERNAL_FATAL), true); 413d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi { 414d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi LOG(INTERNAL_FATAL) << "Attempting see if it's a bad root"; 415d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Thread* self = Thread::Current(); 416d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 417d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi mark_sweep_->VerifyRoots(); 418d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } else { 419d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi const bool heap_bitmap_exclusive_locked = 420d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->IsExclusiveHeld(self); 421d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (heap_bitmap_exclusive_locked) { 422d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 423d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 4244f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier { 4254f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier ScopedThreadSuspension(self, kSuspended); 4264f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier ScopedSuspendAll ssa(__FUNCTION__); 4274f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier mark_sweep_->VerifyRoots(); 4284f55e22630d99ca0edd9e951e5ee96b57bb9b980Mathieu Chartier } 429d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (heap_bitmap_exclusive_locked) { 430d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->ExclusiveLock(self); 431d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 432d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 433d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 434bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(FATAL) << "Can't mark invalid object"; 435bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 436bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 437bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 438bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier private: 439bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweep* const mark_sweep_; 440eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi mirror::Object* const holder_; 441eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MemberOffset offset_; 442bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier}; 443bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 44497509954404d031594b2ecbda607314d169d512eMathieu Chartierinline void MarkSweep::MarkObjectNonNull(mirror::Object* obj, mirror::Object* holder, 44597509954404d031594b2ecbda607314d169d512eMathieu Chartier MemberOffset offset) { 4460e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 447624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 448624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 449624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 4509d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 4518d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 4520e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4530e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_immune_count_; 4540e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 455bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(mark_bitmap_->Test(obj)); 456bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else if (LIKELY(current_space_bitmap_->HasAddress(obj))) { 457bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kCountMarkedObjects) { 458bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_fastpath_count_; 459bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 460bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (UNLIKELY(!current_space_bitmap_->Set(obj))) { 461bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // This object was not previously marked. 462bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 463bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else { 4640e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_slowpath_count_; 4660e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 467eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MarkSweepMarkObjectSlowPath visitor(this, holder, offset); 468bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: We already know that the object is not in the current_space_bitmap_ but MarkBitmap::Set 469bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // will check again. 470bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (!mark_bitmap_->Set(obj, visitor)) { 471bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // Was not already marked, push. 472357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 4730e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 4740e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier} 4750e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier 47697509954404d031594b2ecbda607314d169d512eMathieu Chartierinline void MarkSweep::PushOnMarkStack(mirror::Object* obj) { 4770e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 4780e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // Lock is not needed but is here anyways to please annotalysis. 4790e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 4800e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ExpandMarkStack(); 48169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 4820e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // The object must be pushed on to the mark stack. 4830e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 48469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 48569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 48697509954404d031594b2ecbda607314d169d512eMathieu Chartierinline bool MarkSweep::MarkObjectParallel(mirror::Object* obj) { 4870e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 488624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 489624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 490624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 4919d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 4928d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 49397509954404d031594b2ecbda607314d169d512eMathieu Chartier DCHECK(IsMarked(obj) != nullptr); 49402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 49502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 49602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 49702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // the hard way. 498a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* object_bitmap = current_space_bitmap_; 499bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (LIKELY(object_bitmap->HasAddress(obj))) { 500bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !object_bitmap->AtomicTestAndSet(obj); 50102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 502bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweepMarkObjectSlowPath visitor(this); 503bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !mark_bitmap_->AtomicTestAndSet(obj, visitor); 50402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 50502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 50697509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::MarkHeapReference(mirror::HeapReference<mirror::Object>* ref) { 50797509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkObject(ref->AsMirrorPtr(), nullptr, MemberOffset(0)); 50897509954404d031594b2ecbda607314d169d512eMathieu Chartier} 50997509954404d031594b2ecbda607314d169d512eMathieu Chartier 5100e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier// Used to mark objects when processing the mark stack. If an object is null, it is not marked. 51197509954404d031594b2ecbda607314d169d512eMathieu Chartierinline void MarkSweep::MarkObject(mirror::Object* obj, mirror::Object* holder, 51297509954404d031594b2ecbda607314d169d512eMathieu Chartier MemberOffset offset) { 5130e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (obj != nullptr) { 514eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MarkObjectNonNull(obj, holder, offset); 5150e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } else if (kCountMarkedObjects) { 5160e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_null_count_; 51769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 51869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 51969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 520bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass VerifyRootMarkedVisitor : public SingleRootVisitor { 521bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier public: 522bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier explicit VerifyRootMarkedVisitor(MarkSweep* collector) : collector_(collector) { } 523ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 524bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE 52590443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 52697509954404d031594b2ecbda607314d169d512eMathieu Chartier CHECK(collector_->IsMarked(root) != nullptr) << info.ToString(); 527bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 528bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 529bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier private: 530bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkSweep* const collector_; 531bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier}; 532893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier 533bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartiervoid MarkSweep::VisitRoots(mirror::Object*** roots, size_t count, 534bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) { 535bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 536bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkObjectNonNull(*roots[i]); 537bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 538815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier} 539815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier 540bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartiervoid MarkSweep::VisitRoots(mirror::CompressedReference<mirror::Object>** roots, size_t count, 541bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) { 542bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 543bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkObjectNonNull(roots[i]->AsMirrorPtr()); 544bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 5456f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5466f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 547bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass VerifyRootVisitor : public SingleRootVisitor { 548bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier public: 549bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE 55090443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 5519086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier // See if the root is on any space bitmap. 5529086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier auto* heap = Runtime::Current()->GetHeap(); 5539086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier if (heap->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == nullptr) { 5549086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier space::LargeObjectSpace* large_object_space = heap->GetLargeObjectsSpace(); 5559086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier if (large_object_space != nullptr && !large_object_space->Contains(root)) { 556175746ac9039e9b741d3521420dcaa9c59341738Mathieu Chartier LOG(INTERNAL_FATAL) << "Found invalid root: " << root << " " << info; 5579086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier } 5586f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5596f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5609086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier}; 5616f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 5626f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRoots() { 5639086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier VerifyRootVisitor visitor; 564bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->GetThreadList()->VisitRoots(&visitor); 5656f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5666f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 567893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkRoots(Thread* self) { 568f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 569893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 570893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // If we exclusively hold the mutator lock, all threads must be suspended. 571bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(this); 572893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 573893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } else { 5740f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, kRevokeRosAllocThreadLocalBuffersAtCheckpoint); 575893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // At this point the live stack should no longer have any mutators which push into it. 576893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkNonThreadRoots(); 577893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 578893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagAllRoots | kVisitRootFlagStartLoggingNewRoots)); 579893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 5809ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier} 5819ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier 582858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartiervoid MarkSweep::MarkNonThreadRoots() { 583f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 584bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitNonThreadRoots(this); 585858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 586858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 587893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkConcurrentRoots(VisitRootFlags flags) { 588f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 5891d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Visit all runtime roots and clear dirty flags. 5904edd8476339fd93ba8ff384ad107f1fc662e64a3Mathieu Chartier Runtime::Current()->VisitConcurrentRoots( 5914edd8476339fd93ba8ff384ad107f1fc662e64a3Mathieu Chartier this, static_cast<VisitRootFlags>(flags | kVisitRootFlagNonMoving)); 59269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 59369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 59402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass ScanObjectVisitor { 595cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier public: 59694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE 59794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep) {} 598cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 59997509954404d031594b2ecbda607314d169d512eMathieu Chartier void operator()(mirror::Object* obj) const ALWAYS_INLINE 600da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(Locks::heap_bitmap_lock_) { 60194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 6022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 6032b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 6042b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 60502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_sweep_->ScanObject(obj); 606cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 607cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 608cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier private: 609cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier MarkSweep* const mark_sweep_; 610cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 611cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 612407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartierclass DelayReferenceReferentVisitor { 613407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 614407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit DelayReferenceReferentVisitor(MarkSweep* collector) : collector_(collector) { 615407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 616407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 617407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(mirror::Class* klass, mirror::Reference* ref) const 61890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) 61990443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 620407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier collector_->DelayReferenceReferent(klass, ref); 621407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 622407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 623407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 624407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const collector_; 625407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier}; 626407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 62794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiertemplate <bool kUseFinger = false> 62894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass MarkStackTask : public Task { 62994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 63094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, size_t mark_stack_size, 63197509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack) 63294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep), 63394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_(thread_pool), 63494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_(mark_stack_size) { 63594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We may have to copy part of an existing mark stack when another mark stack overflows. 63694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_size != 0) { 6372cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier DCHECK(mark_stack != nullptr); 63894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Check performance? 63994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier std::copy(mark_stack, mark_stack + mark_stack_size, mark_stack_); 64094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 64194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 64294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_created_; 6431d54e73444e017d3a65234e0f193846f3e27472bIan Rogers } 644262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier } 645262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 64694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kMaxSize = 1 * KB; 647cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 64894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 649407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier class MarkObjectParallelVisitor { 650407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 6513887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain ALWAYS_INLINE MarkObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task, 6523887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain MarkSweep* mark_sweep) 653da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier : chunk_task_(chunk_task), mark_sweep_(mark_sweep) {} 654da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 655da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void operator()(mirror::Object* obj, MemberOffset offset, bool /* static */) const 656da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier ALWAYS_INLINE SHARED_REQUIRES(Locks::mutator_lock_) { 657da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Mark(obj->GetFieldObject<mirror::Object>(offset)); 658da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 659407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 660da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const 66190443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 662da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (!root->IsNull()) { 663da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier VisitRoot(root); 664da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 665da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 666da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 667da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const 668da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 669da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (kCheckLocks) { 670da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 671da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 672da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 673da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Mark(root->AsMirrorPtr()); 674da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 675da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 676da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier private: 677da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void Mark(mirror::Object* ref) const ALWAYS_INLINE SHARED_REQUIRES(Locks::mutator_lock_) { 678407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (ref != nullptr && mark_sweep_->MarkObjectParallel(ref)) { 679407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (kUseFinger) { 680c7df66e2cb124d261cf3b0691a09a3b6e357b6f1Yabin Cui std::atomic_thread_fence(std::memory_order_seq_cst); 681407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (reinterpret_cast<uintptr_t>(ref) >= 6823e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers static_cast<uintptr_t>(mark_sweep_->atomic_finger_.LoadRelaxed())) { 683407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier return; 684407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 685407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 686407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier chunk_task_->MarkStackPush(ref); 687407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 688407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 689407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 690407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 691407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep_; 692407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier }; 693407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 69494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier class ScanObjectParallelVisitor { 69594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 69694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task) ALWAYS_INLINE 69794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : chunk_task_(chunk_task) {} 69894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 699407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier // No thread safety analysis since multiple threads will use this visitor. 70090443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier void operator()(mirror::Object* obj) const SHARED_REQUIRES(Locks::mutator_lock_) 70190443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 702407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep = chunk_task_->mark_sweep_; 703407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectParallelVisitor mark_visitor(chunk_task_, mark_sweep); 704407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(mark_sweep); 705407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mark_sweep->ScanObjectVisit(obj, mark_visitor, ref_visitor); 70694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 70794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 70894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier private: 70994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 71094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier }; 71194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 71294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual ~MarkStackTask() { 71394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Make sure that we have cleared our mark stack. 71494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_EQ(mark_stack_pos_, 0U); 71594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 71694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_deleted_; 7172b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 718cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 719cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 72094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkSweep* const mark_sweep_; 72194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* const thread_pool_; 72294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Thread local mark stack for this task. 72397509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object> mark_stack_[kMaxSize]; 72494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack position. 72594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_pos_; 72694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 72797509954404d031594b2ecbda607314d169d512eMathieu Chartier ALWAYS_INLINE void MarkStackPush(mirror::Object* obj) 72890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) { 72994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == kMaxSize)) { 73094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack overflow, give 1/2 the stack to the thread pool as a new work task. 73194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_ /= 2; 73294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new MarkStackTask(thread_pool_, mark_sweep_, kMaxSize - mark_stack_pos_, 73394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_ + mark_stack_pos_); 73494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_->AddTask(Thread::Current(), task); 73594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 73694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != nullptr); 7370e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_LT(mark_stack_pos_, kMaxSize); 738cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier mark_stack_[mark_stack_pos_++].Assign(obj); 73994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 74094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 74194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 74294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 74394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 74494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 74594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 74690443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier virtual void Run(Thread* self) SHARED_REQUIRES(Locks::mutator_lock_) 74790443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 7486a3c1fcb4ba42ad4d5d142c17a3712a6ddd3866fIan Rogers UNUSED(self); 74994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 75094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 75194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 75297509954404d031594b2ecbda607314d169d512eMathieu Chartier BoundedFifoPowerOfTwo<mirror::Object*, kFifoSize> prefetch_fifo; 75394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (;;) { 75497509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* obj = nullptr; 75594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 75694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (mark_stack_pos_ != 0 && prefetch_fifo.size() < kFifoSize) { 75797509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const mark_stack_obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); 758277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe DCHECK(mark_stack_obj != nullptr); 759277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe __builtin_prefetch(mark_stack_obj); 760277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe prefetch_fifo.push_back(mark_stack_obj); 76194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 76294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(prefetch_fifo.empty())) { 76394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 76494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 76594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 76694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 76794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 76894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == 0)) { 76994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 77094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 771cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); 77294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 77311409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 7740e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier visitor(obj); 77594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 77694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 77794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 77894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 77994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass CardScanTask : public MarkStackTask<false> { 78094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 781a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier CardScanTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 782a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, 78313735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* begin, uint8_t* end, uint8_t minimum_age, size_t mark_stack_size, 78497509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack_obj, bool clear_card) 78594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, mark_stack_size, mark_stack_obj), 78694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 78794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 78894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end), 789727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age_(minimum_age), clear_card_(clear_card) { 79094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 79194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 79294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 793a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 79413735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const begin_; 79513735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const end_; 79613735955f39b3b304c37d2b2840663c131262c18Ian Rogers const uint8_t minimum_age_; 797727b294b4091cf3cc2f8137cd654552f477fe46aLei Li const bool clear_card_; 79894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 79994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 80094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 80194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 80294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 80394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 80494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 80594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = mark_sweep_->GetHeap()->GetCardTable(); 806727b294b4091cf3cc2f8137cd654552f477fe46aLei Li size_t cards_scanned = clear_card_ ? 807727b294b4091cf3cc2f8137cd654552f477fe46aLei Li card_table->Scan<true>(bitmap_, begin_, end_, visitor, minimum_age_) : 808727b294b4091cf3cc2f8137cd654552f477fe46aLei Li card_table->Scan<false>(bitmap_, begin_, end_, visitor, minimum_age_); 8090f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier VLOG(heap) << "Parallel scanning cards " << reinterpret_cast<void*>(begin_) << " - " 8100f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier << reinterpret_cast<void*>(end_) << " = " << cards_scanned; 81194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 81294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 81394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 814cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 815cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 8162775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiersize_t MarkSweep::GetThreadCount(bool paused) const { 8172775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (heap_->GetThreadPool() == nullptr || !heap_->CareAboutPauseTimes()) { 818bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return 1; 8192775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 82010d6886c9ce3ed87431cf10d376a69c23950fa61Mathieu Chartier return (paused ? heap_->GetParallelGCThreadCount() : heap_->GetConcGCThreadCount()) + 1; 8212775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier} 8222775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier 82313735955f39b3b304c37d2b2840663c131262c18Ian Rogersvoid MarkSweep::ScanGrayObjects(bool paused, uint8_t minimum_age) { 82494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = GetHeap()->GetCardTable(); 82594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 8262775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 8272775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier // The parallel version with only one thread is faster for card scanning, TODO: fix. 828bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kParallelCardScan && thread_count > 1) { 829720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 83094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Can't have a different split for each space since multiple spaces can have their cards being 83194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // scanned at the same time. 832f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(paused ? "(Paused)ScanGrayObjects" : __FUNCTION__, 833f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier GetTimings()); 83494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Try to take some of the mark stack since we can pass this off to the worker tasks. 83597509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack_begin = mark_stack_->Begin(); 83697509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* mark_stack_end = mark_stack_->End(); 837720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier const size_t mark_stack_size = mark_stack_end - mark_stack_begin; 83894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Estimated number of work tasks we will create. 83994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_tasks = GetHeap()->GetContinuousSpaces().size() * thread_count; 84094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_NE(mark_stack_tasks, 0U); 84194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_delta = std::min(CardScanTask::kMaxSize / 2, 84294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_size / mark_stack_tasks + 1); 84394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 844590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() == nullptr) { 845590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 846590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 84713735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* card_begin = space->Begin(); 84813735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* card_end = space->End(); 8490941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Align up the end address. For example, the image space's end 8500941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // may not be card-size-aligned. 8510941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi card_end = AlignUp(card_end, accounting::CardTable::kCardSize); 85214d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(card_begin, accounting::CardTable::kCardSize); 85314d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(card_end, accounting::CardTable::kCardSize); 85494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how many bytes of heap we will scan, 85594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t address_range = card_end - card_begin; 85694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how much address range each task gets. 85794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t card_delta = RoundUp(address_range / thread_count + 1, 85894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable::kCardSize); 859727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // If paused and the space is neither zygote nor image space, we could clear the dirty 860727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // cards to avoid accumulating them to increase card scanning load in the following GC 861727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // cycles. We need to keep dirty cards of image space and zygote space in order to track 862727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // references to the other spaces. 863727b294b4091cf3cc2f8137cd654552f477fe46aLei Li bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); 86494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create the worker tasks for this space. 86594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (card_begin != card_end) { 86694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add a range of cards. 86794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t addr_remaining = card_end - card_begin; 86894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t card_increment = std::min(card_delta, addr_remaining); 86994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Take from the back of the mark stack. 87094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_remaining = mark_stack_end - mark_stack_begin; 87194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining); 87294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_end -= mark_stack_increment; 87394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment)); 8740e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_EQ(mark_stack_end, mark_stack_->End()); 87594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add the new task to the thread pool. 87694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new CardScanTask(thread_pool, this, space->GetMarkBitmap(), card_begin, 87794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin + card_increment, minimum_age, 878727b294b4091cf3cc2f8137cd654552f477fe46aLei Li mark_stack_increment, mark_stack_end, clear_card); 87994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 88094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin += card_increment; 88194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 88294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 8830f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 8840941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Note: the card scan below may dirty new cards (and scan them) 8850941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // as a side effect when a Reference object is encountered and 8860941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // queued during the marking. See b/11465268. 8872775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 88894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 8892775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 89094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 89194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 89294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 893590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() != nullptr) { 894590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Image spaces are handled properly since live == marked for them. 895f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier const char* name = nullptr; 896590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier switch (space->GetGcRetentionPolicy()) { 897f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyNeverCollect: 898f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayImageSpaceObjects" : "ScanGrayImageSpaceObjects"; 899f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 900f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyFullCollect: 901f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayZygoteSpaceObjects" : "ScanGrayZygoteSpaceObjects"; 902f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 903f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyAlwaysCollect: 904f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayAllocSpaceObjects" : "ScanGrayAllocSpaceObjects"; 905f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 906f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier default: 907f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier LOG(FATAL) << "Unreachable"; 9082c4257be8191c5eefde744e8965fcefc80a0a97dIan Rogers UNREACHABLE(); 909f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 910f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(name, GetTimings()); 911590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier ScanObjectVisitor visitor(this); 912727b294b4091cf3cc2f8137cd654552f477fe46aLei Li bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); 913727b294b4091cf3cc2f8137cd654552f477fe46aLei Li if (clear_card) { 914727b294b4091cf3cc2f8137cd654552f477fe46aLei Li card_table->Scan<true>(space->GetMarkBitmap(), space->Begin(), space->End(), visitor, 915727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age); 916727b294b4091cf3cc2f8137cd654552f477fe46aLei Li } else { 917727b294b4091cf3cc2f8137cd654552f477fe46aLei Li card_table->Scan<false>(space->GetMarkBitmap(), space->Begin(), space->End(), visitor, 918727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age); 919727b294b4091cf3cc2f8137cd654552f477fe46aLei Li } 920590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 92194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 92294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 92394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier} 92494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 92594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass RecursiveMarkTask : public MarkStackTask<false> { 92694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 92794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 928a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, uintptr_t begin, uintptr_t end) 9292cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, 0, nullptr), bitmap_(bitmap), begin_(begin), 93094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end) { 93194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 93294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 93394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 934a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 93594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t begin_; 93694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t end_; 93794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 93894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 93994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 94094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 94194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 94294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 94394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 94494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 94594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_->VisitMarkedRange(begin_, end_, visitor); 94694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 94794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 94894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 94994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 95094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 95158551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// Populates the mark stack based on the set of marked objects and 95258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// recursively marks until the mark stack is emptied. 9532b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::RecursiveMark() { 954f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 955a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // RecursiveMark will build the lists of known instances of the Reference classes. See 956a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // DelayReferenceReferent for details. 95794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseRecursiveMark) { 95894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const bool partial = GetGcType() == kGcTypePartial; 95994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectVisitor scan_visitor(this); 96094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* self = Thread::Current(); 96194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = heap_->GetThreadPool(); 9622775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(false); 9632775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const bool parallel = kParallelRecursiveMark && thread_count > 1; 96494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->Reset(); 96502e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 9661d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if ((space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) || 9671d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (!partial && space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) { 9680e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = space->GetMarkBitmap(); 9690e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_ == nullptr) { 970590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 9712b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 97294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (parallel) { 97394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We will use the mark stack the future. 97494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // CHECK(mark_stack_->IsEmpty()); 97594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 97694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 97794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 9783e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers atomic_finger_.StoreRelaxed(AtomicInteger::MaxValue()); 97994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 98094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create a few worker tasks. 9812775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t n = thread_count * 2; 98294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (begin != end) { 98394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t start = begin; 98494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t delta = (end - begin) / n; 98594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delta = RoundUp(delta, KB); 98694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (delta < 16 * KB) delta = end - begin; 98794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin += delta; 9880e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier auto* task = new RecursiveMarkTask(thread_pool, this, current_space_bitmap_, start, 98994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin); 99094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 99194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 9922775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 99394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 9942775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 99594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 99694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 99794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 99894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 99994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 10000e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_->VisitMarkedRange(begin, end, scan_visitor); 100194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 1002357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1003357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1004357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 100594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(false); 100658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 100758551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 100813735955f39b3b304c37d2b2840663c131262c18Ian Rogersvoid MarkSweep::RecursiveMarkDirtyObjects(bool paused, uint8_t minimum_age) { 100994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanGrayObjects(paused, minimum_age); 101094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(paused); 1011262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier} 1012262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 101358551df3c2646ed507feec9e9eb3768085a76059Carl Shapirovoid MarkSweep::ReMarkRoots() { 1014f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1015893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(Thread::Current()); 1016bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(this, static_cast<VisitRootFlags>( 1017bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier kVisitRootFlagNewRoots | kVisitRootFlagStopLoggingNewRoots | kVisitRootFlagClearRootLog)); 10187bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier if (kVerifyRootsMarked) { 1019277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("(Paused)VerifyRoots", GetTimings()); 1020bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier VerifyRootMarkedVisitor visitor(this); 1021bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(&visitor); 1022893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 102358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 102458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 10250f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::SweepSystemWeaks(Thread* self) { 1026f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 102714c3bf91b2ec434295ec84d6446f495fb7de6d5cMathieu Chartier ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 102897509954404d031594b2ecbda607314d169d512eMathieu Chartier Runtime::Current()->SweepSystemWeaks(this); 102969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 103069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 103197509954404d031594b2ecbda607314d169d512eMathieu Chartierclass VerifySystemWeakVisitor : public IsMarkedVisitor { 103297509954404d031594b2ecbda607314d169d512eMathieu Chartier public: 103397509954404d031594b2ecbda607314d169d512eMathieu Chartier explicit VerifySystemWeakVisitor(MarkSweep* mark_sweep) : mark_sweep_(mark_sweep) {} 103497509954404d031594b2ecbda607314d169d512eMathieu Chartier 103597509954404d031594b2ecbda607314d169d512eMathieu Chartier virtual mirror::Object* IsMarked(mirror::Object* obj) OVERRIDE 103690443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 103797509954404d031594b2ecbda607314d169d512eMathieu Chartier mark_sweep_->VerifyIsLive(obj); 103897509954404d031594b2ecbda607314d169d512eMathieu Chartier return obj; 103997509954404d031594b2ecbda607314d169d512eMathieu Chartier } 104097509954404d031594b2ecbda607314d169d512eMathieu Chartier 104197509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkSweep* const mark_sweep_; 104297509954404d031594b2ecbda607314d169d512eMathieu Chartier}; 1043c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 104497509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::VerifyIsLive(const mirror::Object* obj) { 10454aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier if (!heap_->GetLiveBitmap()->Test(obj)) { 1046cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier // TODO: Consider live stack? Has this code bitrotted? 1047cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier CHECK(!heap_->allocation_stack_->Contains(obj)) 1048cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier << "Found dead object " << obj << "\n" << heap_->DumpSpaces(); 1049c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 1050c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1051c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1052c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifySystemWeaks() { 1053f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 10546aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier // Verify system weaks, uses a special object visitor which returns the input object. 105597509954404d031594b2ecbda607314d169d512eMathieu Chartier VerifySystemWeakVisitor visitor(this); 105697509954404d031594b2ecbda607314d169d512eMathieu Chartier Runtime::Current()->SweepSystemWeaks(&visitor); 1057c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1058c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1059bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass CheckpointMarkThreadRoots : public Closure, public RootVisitor { 1060858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier public: 10613887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain CheckpointMarkThreadRoots(MarkSweep* mark_sweep, 10623887c468d731420e929e6ad3acf190d5431e94fcRoland Levillain bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) 10630f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier : mark_sweep_(mark_sweep), 10640f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint_( 10650f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 10660f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier } 1067858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1068bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoots(mirror::Object*** roots, size_t count, const RootInfo& info ATTRIBUTE_UNUSED) 106990443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) 107090443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 1071bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 1072bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier mark_sweep_->MarkObjectNonNullParallel(*roots[i]); 1073bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1074bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1075bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 1076bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoots(mirror::CompressedReference<mirror::Object>** roots, size_t count, 1077bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) 107890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) 107990443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 1080bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 1081bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier mark_sweep_->MarkObjectNonNullParallel(roots[i]->AsMirrorPtr()); 1082bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1083bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1084bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 10854aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier virtual void Run(Thread* thread) OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 10863f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_BEGIN("Marking thread roots"); 1087858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier // Note: self is not necessarily equal to thread since thread may be suspended. 1088bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Thread* const self = Thread::Current(); 1089d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier CHECK(thread == self || thread->IsSuspended() || thread->GetState() == kWaitingPerformingGc) 1090d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << thread->GetState() << " thread " << thread << " self " << self; 1091bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier thread->VisitRoots(this); 10923f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_END(); 10930f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (revoke_ros_alloc_thread_local_buffers_at_checkpoint_) { 10940f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_BEGIN("RevokeRosAllocThreadLocalBuffers"); 1095c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi mark_sweep_->GetHeap()->RevokeRosAllocThreadLocalBuffers(thread); 10960f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_END(); 1097c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1098dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // If thread is a running mutator, then act on behalf of the garbage collector. 1099dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // See the code in ThreadList::RunCheckpoint. 1100dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li if (thread->GetState() == kRunnable) { 1101dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li mark_sweep_->GetBarrier().Pass(self); 1102dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li } 1103858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier } 1104858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1105858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier private: 11064aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier MarkSweep* const mark_sweep_; 11070f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier const bool revoke_ros_alloc_thread_local_buffers_at_checkpoint_; 1108858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier}; 1109858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 11100f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::MarkRootsCheckpoint(Thread* self, 11110f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 1112f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 11130f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CheckpointMarkThreadRoots check_point(this, revoke_ros_alloc_thread_local_buffers_at_checkpoint); 1114858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 11151d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Request the check point is run on all threads returning a count of the threads that must 11161d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // run through the barrier including self. 11171d54e73444e017d3a65234e0f193846f3e27472bIan Rogers size_t barrier_count = thread_list->RunCheckpoint(&check_point); 11181d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Release locks then wait for all mutator threads to pass the barrier. 1119dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // If there are no threads to wait which implys that all the checkpoint functions are finished, 1120dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // then no need to release locks. 1121dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li if (barrier_count == 0) { 1122dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li return; 1123dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li } 11241d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 11251d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedUnlock(self); 11264aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier { 11274aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier ScopedThreadStateChange tsc(self, kWaitingForCheckPointsToRun); 11284aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier gc_barrier_->Increment(self, barrier_count); 11294aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier } 11301d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedLock(self); 11311d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveLock(self); 1132858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 1133858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 11341d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::SweepArray(accounting::ObjectStack* allocations, bool swap_bitmaps) { 1135f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1136e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Thread* self = Thread::Current(); 1137bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi mirror::Object** chunk_free_buffer = reinterpret_cast<mirror::Object**>( 1138bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi sweep_array_free_buffer_mem_map_->BaseBegin()); 1139e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t chunk_free_pos = 0; 114010fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier ObjectBytePair freed; 114110fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier ObjectBytePair freed_los; 1142e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // How many objects are left in the array, modified after each space is swept. 114397509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* objects = allocations->Begin(); 1144e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t count = allocations->Size(); 1145e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Change the order to ensure that the non-moving space last swept as an optimization. 1146e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::vector<space::ContinuousSpace*> sweep_spaces; 1147e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::ContinuousSpace* non_moving_space = nullptr; 1148e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : heap_->GetContinuousSpaces()) { 11498d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (space->IsAllocSpace() && !immune_region_.ContainsSpace(space) && 11508d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier space->GetLiveBitmap() != nullptr) { 1151e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space == heap_->GetNonMovingSpace()) { 1152e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier non_moving_space = space; 1153e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1154e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(space); 1155e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1156e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1157e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1158e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Unlikely to sweep a significant amount of non_movable objects, so we do these after the after 1159e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the other alloc spaces as an optimization. 1160e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (non_moving_space != nullptr) { 1161e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(non_moving_space); 1162e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1163e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Start by sweeping the continuous spaces. 1164e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : sweep_spaces) { 1165e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::AllocSpace* alloc_space = space->AsAllocSpace(); 1166a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* live_bitmap = space->GetLiveBitmap(); 1167a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); 1168e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (swap_bitmaps) { 1169e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::swap(live_bitmap, mark_bitmap); 1170e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 117197509954404d031594b2ecbda607314d169d512eMathieu Chartier StackReference<mirror::Object>* out = objects; 1172e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (size_t i = 0; i < count; ++i) { 117397509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const obj = objects[i].AsMirrorPtr(); 1174f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1175f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1176f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1177e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space->HasAddress(obj)) { 1178e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // This object is in the space, remove it from the array and add it to the sweep buffer 1179e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // if needed. 1180e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!mark_bitmap->Test(obj)) { 1181e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos >= kSweepArrayChunkFreeSize) { 1182277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("FreeList", GetTimings()); 118310fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.objects += chunk_free_pos; 118410fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1185e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1186e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1187e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_buffer[chunk_free_pos++] = obj; 1188e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1189e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1190cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier (out++)->Assign(obj); 1191e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1192e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1193e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos > 0) { 1194277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("FreeList", GetTimings()); 119510fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.objects += chunk_free_pos; 119610fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1197e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1198e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1199e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // All of the references which space contained are no longer in the allocation stack, update 1200e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the count. 1201e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier count = out - objects; 1202e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1203e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle the large object space. 12041d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 12052dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (large_object_space != nullptr) { 12062dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier accounting::LargeObjectBitmap* large_live_objects = large_object_space->GetLiveBitmap(); 12072dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier accounting::LargeObjectBitmap* large_mark_objects = large_object_space->GetMarkBitmap(); 12082dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (swap_bitmaps) { 12092dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier std::swap(large_live_objects, large_mark_objects); 1210f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 12112dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier for (size_t i = 0; i < count; ++i) { 121297509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* const obj = objects[i].AsMirrorPtr(); 12132dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier // Handle large objects. 12142dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (kUseThreadLocalAllocationStack && obj == nullptr) { 12152dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier continue; 12162dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 12172dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (!large_mark_objects->Test(obj)) { 12182dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier ++freed_los.objects; 12192dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier freed_los.bytes += large_object_space->Free(self, obj); 12202dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 1221357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1222357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1223f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier { 1224277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("RecordFree", GetTimings()); 1225f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier RecordFree(freed); 1226f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier RecordFreeLOS(freed_los); 1227277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe t2.NewTiming("ResetStack"); 1228f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier allocations->Reset(); 1229f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 1230c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers sweep_array_free_buffer_mem_map_->MadviseDontNeedAndZero(); 1231357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 1232357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 12331d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::Sweep(bool swap_bitmaps) { 1234f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 12350f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Ensure that nobody inserted items in the live stack after we swapped the stacks. 12360f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CHECK_GE(live_stack_freeze_size_, GetHeap()->GetLiveStack()->Size()); 1237f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier { 1238f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t2("MarkAllocStackAsLive", GetTimings()); 1239f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier // Mark everything allocated since the last as GC live so that we can sweep concurrently, 1240f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier // knowing that new allocations won't be marked as live. 1241f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier accounting::ObjectStack* live_stack = heap_->GetLiveStack(); 1242f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier heap_->MarkAllocStackAsLive(live_stack); 1243f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier live_stack->Reset(); 1244f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier DCHECK(mark_stack_->IsEmpty()); 1245f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 124602e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1247a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier if (space->IsContinuousMemMapAllocSpace()) { 1248a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); 1249f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming split( 125010fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier alloc_space->IsZygoteSpace() ? "SweepZygoteSpace" : "SweepMallocSpace", GetTimings()); 125110fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier RecordFree(alloc_space->Sweep(swap_bitmaps)); 125258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 125358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 12542b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SweepLargeObjects(swap_bitmaps); 125558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 125658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 1257e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartiervoid MarkSweep::SweepLargeObjects(bool swap_bitmaps) { 12582dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier space::LargeObjectSpace* los = heap_->GetLargeObjectsSpace(); 12592dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (los != nullptr) { 12602dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier TimingLogger::ScopedTiming split(__FUNCTION__, GetTimings()); 12612dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier RecordFreeLOS(los->Sweep(swap_bitmaps)); 12622dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 1263e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier} 1264e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier 1265407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// Process the "referent" field in a java.lang.ref.Reference. If the referent has not yet been 1266407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// marked, put it on the appropriate list in the heap for later processing. 1267407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::DelayReferenceReferent(mirror::Class* klass, mirror::Reference* ref) { 126897509954404d031594b2ecbda607314d169d512eMathieu Chartier heap_->GetReferenceProcessor()->DelayReferenceReferent(klass, ref, this); 126969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 127069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 127197509954404d031594b2ecbda607314d169d512eMathieu Chartierclass MarkVisitor { 127202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier public: 127397509954404d031594b2ecbda607314d169d512eMathieu Chartier explicit MarkVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE : mark_sweep_(mark_sweep) { 1274407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 127502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 1276e4275c07e9852a6944f47efa9d0591fceb8e8e36Mathieu Chartier void operator()(mirror::Object* obj, MemberOffset offset, bool is_static ATTRIBUTE_UNUSED) const 127790443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier ALWAYS_INLINE SHARED_REQUIRES(Locks::mutator_lock_) 127890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::heap_bitmap_lock_) { 127994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 12802b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 12812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 12822b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1283eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi mark_sweep_->MarkObject(obj->GetFieldObject<mirror::Object>(offset), obj, offset); 128402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 128502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 1286da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const 1287da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(Locks::heap_bitmap_lock_) { 1288da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (!root->IsNull()) { 1289da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier VisitRoot(root); 1290da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1291da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1292da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 1293da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const 1294da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(Locks::heap_bitmap_lock_) { 1295da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier if (kCheckLocks) { 1296da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 1297da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 1298da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1299da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier mark_sweep_->MarkObject(root->AsMirrorPtr()); 1300da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier } 1301da7c650022a974be10e2f00fa07d5109e3d8826fMathieu Chartier 130202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier private: 130302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MarkSweep* const mark_sweep_; 130402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier}; 130502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 130669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Scans an object reference. Determines the type of the reference 130769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// and dispatches to a specialized scanning routine. 130897509954404d031594b2ecbda607314d169d512eMathieu Chartiervoid MarkSweep::ScanObject(mirror::Object* obj) { 130997509954404d031594b2ecbda607314d169d512eMathieu Chartier MarkVisitor mark_visitor(this); 1310407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(this); 1311407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ScanObjectVisit(obj, mark_visitor, ref_visitor); 131202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 131302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 13142775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiervoid MarkSweep::ProcessMarkStackParallel(size_t thread_count) { 131502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier Thread* self = Thread::Current(); 131602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 13172775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t chunk_size = std::min(mark_stack_->Size() / thread_count + 1, 13182775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier static_cast<size_t>(MarkStackTask<false>::kMaxSize)); 131994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier CHECK_GT(chunk_size, 0U); 132094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Split the current mark stack up into work tasks. 1321cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier for (auto* it = mark_stack_->Begin(), *end = mark_stack_->End(); it < end; ) { 132294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t delta = std::min(static_cast<size_t>(end - it), chunk_size); 13230e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier thread_pool->AddTask(self, new MarkStackTask<false>(thread_pool, this, delta, it)); 132494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier it += delta; 132502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 13262775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 132702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier thread_pool->StartWorkers(self); 13282775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 132994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 133002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_stack_->Reset(); 13313e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers CHECK_EQ(work_chunks_created_.LoadSequentiallyConsistent(), 13323e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_deleted_.LoadSequentiallyConsistent()) 13333e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " some of the work chunks were leaked"; 133469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 133569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 13365d76c435082332ef79a22962386fa92a0870e378Ian Rogers// Scan anything that's on the mark stack. 133794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ProcessMarkStack(bool paused) { 1338f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(paused ? "(Paused)ProcessMarkStack" : __FUNCTION__, GetTimings()); 13392775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 13402775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelProcessMarkStack && thread_count > 1 && 13412775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier mark_stack_->Size() >= kMinimumParallelMarkStackSize) { 13422775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier ProcessMarkStackParallel(thread_count); 134394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 134494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 134594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 134697509954404d031594b2ecbda607314d169d512eMathieu Chartier BoundedFifoPowerOfTwo<mirror::Object*, kFifoSize> prefetch_fifo; 1347d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier for (;;) { 134897509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* obj = nullptr; 134994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 135094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (!mark_stack_->IsEmpty() && prefetch_fifo.size() < kFifoSize) { 135197509954404d031594b2ecbda607314d169d512eMathieu Chartier mirror::Object* mark_stack_obj = mark_stack_->PopBack(); 13522cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier DCHECK(mark_stack_obj != nullptr); 1353277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe __builtin_prefetch(mark_stack_obj); 1354277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe prefetch_fifo.push_back(mark_stack_obj); 135594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 135694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (prefetch_fifo.empty()) { 135794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 135894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 135994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 136094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 136194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 136294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_->IsEmpty()) { 136394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 136494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 136594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_->PopBack(); 1366d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier } 13674aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier DCHECK(obj != nullptr); 1368d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier ScanObject(obj); 1369357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1370357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 137169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 137269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 137397509954404d031594b2ecbda607314d169d512eMathieu Chartierinline mirror::Object* MarkSweep::IsMarked(mirror::Object* object) { 13748d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(object)) { 137597509954404d031594b2ecbda607314d169d512eMathieu Chartier return object; 13767469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 13770e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_->HasAddress(object)) { 137897509954404d031594b2ecbda607314d169d512eMathieu Chartier return current_space_bitmap_->Test(object) ? object : nullptr; 13797469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 138097509954404d031594b2ecbda607314d169d512eMathieu Chartier return mark_bitmap_->Test(object) ? object : nullptr; 13817469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier} 13827469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier 13832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::FinishPhase() { 1384f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1385d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountScannedTypes) { 138652a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier VLOG(gc) 138752a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << "MarkSweep scanned" 138852a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " no reference objects=" << no_reference_class_count_.LoadRelaxed() 138952a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " normal objects=" << normal_count_.LoadRelaxed() 139052a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " classes=" << class_count_.LoadRelaxed() 139152a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " object arrays=" << object_array_count_.LoadRelaxed() 139252a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " references=" << reference_count_.LoadRelaxed() 139352a7f5caebdf359ab877f1928aad59f1e9ad29faMathieu Chartier << " other=" << other_count_.LoadRelaxed(); 139402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 139502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kCountTasks) { 13963e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Total number of work chunks allocated: " << work_chunks_created_.LoadRelaxed(); 139702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 139802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kMeasureOverhead) { 13993e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Overhead time " << PrettyDuration(overhead_time_.LoadRelaxed()); 140002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 140102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 14023e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Large objects tested " << large_object_test_.LoadRelaxed() 14033e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " marked " << large_object_mark_.LoadRelaxed(); 140402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 14050e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 14063e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Marked: null=" << mark_null_count_.LoadRelaxed() 14073e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " immune=" << mark_immune_count_.LoadRelaxed() 14083e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " fastpath=" << mark_fastpath_count_.LoadRelaxed() 14093e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " slowpath=" << mark_slowpath_count_.LoadRelaxed(); 14100e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 14114aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier CHECK(mark_stack_->IsEmpty()); // Ensure that the mark stack is empty. 14125301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier mark_stack_->Reset(); 14134aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 14144aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->ClearMarkedObjects(); 141569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 141669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 1417c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchivoid MarkSweep::RevokeAllThreadLocalBuffers() { 1418c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi if (kRevokeRosAllocThreadLocalBuffersAtCheckpoint && IsConcurrent()) { 1419c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // If concurrent, rosalloc thread-local buffers are revoked at the 1420c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // thread checkpoint. Bump pointer space thread-local buffers must 1421c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // not be in use. 1422c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->AssertAllBumpPointerSpaceThreadLocalBuffersAreRevoked(); 1423c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } else { 1424f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1425c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->RevokeAllThreadLocalBuffers(); 1426c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1427c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi} 1428c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 14291d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace collector 14301d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace gc 143169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} // namespace art 1432