mark_sweep.cc revision e401d146407d61eeb99f8d6176b2ac13c4df1e33
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/image_space.h" 411d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/large_object_space.h" 421d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/space-inl.h" 432dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mark_sweep-inl.h" 442dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object-inl.h" 451f87008b165d26541d832ff805250afdc89c253dBrian Carlstrom#include "runtime.h" 464aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier#include "scoped_thread_state_change.h" 471d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "thread-inl.h" 486f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier#include "thread_list.h" 4969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 503e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::Object; 512dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers 5269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapironamespace art { 531d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace gc { 541d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace collector { 5569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 5602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Performance options. 57eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseRecursiveMark = false; 58eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseMarkStackPrefetch = true; 59eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kSweepArrayChunkFreeSize = 1024; 60eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kPreCleanCards = true; 6194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 6294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Parallelism options. 63eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelCardScan = true; 64eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelRecursiveMark = true; 6594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Don't attempt to parallelize mark stack processing unless the mark stack is at least n 6694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// elements. This is temporary until we reduce the overhead caused by allocating tasks, etc.. Not 6794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// having this can add overhead in ProcessReferences since we may end up doing many calls of 6894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// ProcessMarkStack with very small mark stacks. 69eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kMinimumParallelMarkStackSize = 128; 70eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelProcessMarkStack = true; 71858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 7202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Profiling and information flags. 73eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kProfileLargeObjects = false; 74eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kMeasureOverhead = false; 75eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCountTasks = false; 76eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCountJavaLangRefs = false; 770e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierstatic constexpr bool kCountMarkedObjects = false; 7894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 7994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Turn off kCheckLocks when profiling the GC since it slows the GC down by up to 40%. 80eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCheckLocks = kDebugLocking; 817bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartierstatic constexpr bool kVerifyRootsMarked = kIsDebugBuild; 8202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 83c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// If true, revoke the rosalloc thread-local buffers at the 84c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// checkpoint, as opposed to during the pause. 85c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchistatic constexpr bool kRevokeRosAllocThreadLocalBuffersAtCheckpoint = true; 86c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::BindBitmaps() { 88f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Mark all of the spaces we never collect as immune. 9194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 921d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyNeverCollect) { 938d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier CHECK(immune_region_.AddContinuousSpace(space)) << "Failed to add space " << *space; 942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 952b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 972b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 981d54e73444e017d3a65234e0f193846f3e27472bIan RogersMarkSweep::MarkSweep(Heap* heap, bool is_concurrent, const std::string& name_prefix) 991d54e73444e017d3a65234e0f193846f3e27472bIan Rogers : GarbageCollector(heap, 100590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier name_prefix + 1011d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (is_concurrent ? "concurrent mark sweep": "mark sweep")), 1023e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers current_space_bitmap_(nullptr), mark_bitmap_(nullptr), mark_stack_(nullptr), 10335883cc623fdf475a4ead1dafcba9e9becc1ed11Mathieu Chartier gc_barrier_(new Barrier(0)), 104958291c7afe723d846a39539fd00410c102485f3Mathieu Chartier mark_stack_lock_("mark sweep mark stack lock", kMarkSweepMarkStackLock), 1053e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers is_concurrent_(is_concurrent), live_stack_freeze_size_(0) { 106bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi std::string error_msg; 107bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi MemMap* mem_map = MemMap::MapAnonymous( 108bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi "mark sweep sweep array free buffer", nullptr, 109bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi RoundUp(kSweepArrayChunkFreeSize * sizeof(mirror::Object*), kPageSize), 1105c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko PROT_READ | PROT_WRITE, false, false, &error_msg); 111bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi CHECK(mem_map != nullptr) << "Couldn't allocate sweep array free buffer: " << error_msg; 112bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi sweep_array_free_buffer_mem_map_.reset(mem_map); 1135301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier} 114b3bd5f07884f5a1f2b84224363b1372d7c28d447Elliott Hughes 1152b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::InitializePhase() { 116f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 117eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier mark_stack_ = heap_->GetMarkStack(); 118e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier DCHECK(mark_stack_ != nullptr); 1198d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier immune_region_.Reset(); 1203e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers class_count_.StoreRelaxed(0); 1213e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers array_count_.StoreRelaxed(0); 1223e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers other_count_.StoreRelaxed(0); 1233e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers large_object_test_.StoreRelaxed(0); 1243e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers large_object_mark_.StoreRelaxed(0); 1253e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers overhead_time_ .StoreRelaxed(0); 1263e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_created_.StoreRelaxed(0); 1273e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_deleted_.StoreRelaxed(0); 1283e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers reference_count_.StoreRelaxed(0); 1293e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_null_count_.StoreRelaxed(0); 1303e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_immune_count_.StoreRelaxed(0); 1313e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_fastpath_count_.StoreRelaxed(0); 1323e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers mark_slowpath_count_.StoreRelaxed(0); 1330e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier { 134eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier // TODO: I don't think we should need heap bitmap lock to Get the mark bitmap. 1350e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 1360e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_bitmap_ = heap_->GetMarkBitmap(); 1370e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 13810fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier if (!GetCurrentIteration()->GetClearSoftReferences()) { 139df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi // Always clear soft references if a non-sticky collection. 14010fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier GetCurrentIteration()->SetClearSoftReferences(GetGcType() != collector::kGcTypeSticky); 141df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi } 1426f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier} 1436f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier 1446f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartiervoid MarkSweep::RunPhases() { 1456f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Thread* self = Thread::Current(); 1466f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier InitializePhase(); 1476f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Locks::mutator_lock_->AssertNotHeld(self); 1486f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier if (IsConcurrent()) { 1496f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerification(this); 1506f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1516f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1526f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1536f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1546f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1556f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1566f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1576f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1586f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } else { 1596f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1606f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerificationPaused(this); 1616f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1626f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1636f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1646f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1656f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1666f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1676f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Sweeping always done concurrently, even for non concurrent mark sweep. 1686f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1696f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReclaimPhase(); 1706f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1716f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PostGcVerification(this); 1726f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier FinishPhase(); 1732b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1742b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1752b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ProcessReferences(Thread* self) { 1768e56c7e41cb37e2eaf553503968a01ff893b135bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 17778f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->ProcessReferences( 17810fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier true, GetTimings(), GetCurrentIteration()->GetClearSoftReferences(), 17910fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier &HeapReferenceMarkedCallback, &MarkObjectCallback, &ProcessMarkStackCallback, this); 1801ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier} 1811ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier 1820f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::PausePhase() { 183f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t("(Paused)PausePhase", GetTimings()); 1842b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 1852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 1860f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (IsConcurrent()) { 1870f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Handle the dirty objects if we are a concurrent GC. 1882b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Re-mark root set. 1902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ReMarkRoots(); 1912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Scan dirty objects, this is only required if we are not doing concurrent GC. 19294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkDirtyObjects(true, accounting::CardTable::kCardDirty); 1932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1940f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier { 195f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t2("SwapStacks", GetTimings()); 1962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1970f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier heap_->SwapStacks(self); 1980f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier live_stack_freeze_size_ = heap_->GetLiveStack()->Size(); 1990f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Need to revoke all the thread local allocation stacks since we just swapped the allocation 2000f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // stacks and don't want anybody to allocate into the live stack. 201c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 2022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 2030f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier heap_->PreSweepingGcVerification(this); 2046f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Disallow new system weaks to prevent a race which occurs when someone adds a new system 2056f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // weak before we sweep them. Since this new system weak may not be marked, the GC may 2066f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // incorrectly sweep it. This also fixes a race where interning may attempt to return a strong 2076f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // reference to a string that is about to be swept. 2086f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Runtime::Current()->DisallowNewSystemWeaks(); 20978f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Enable the reference processing slow path, needs to be done with mutators paused since there 21078f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // is no lock in the GetReferent fast path. 21178f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->EnableSlowPath(); 2122b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2132b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 214dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartiervoid MarkSweep::PreCleanCards() { 215dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Don't do this for non concurrent GCs since they don't have any dirty cards. 216dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier if (kPreCleanCards && IsConcurrent()) { 217f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 218dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier Thread* self = Thread::Current(); 219dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier CHECK(!Locks::mutator_lock_->IsExclusiveHeld(self)); 220dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process dirty cards and add dirty cards to mod union tables, also ages cards. 2214add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li heap_->ProcessCards(GetTimings(), false, true, false); 222eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The checkpoint root marking is required to avoid a race condition which occurs if the 223eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // following happens during a reference write: 224eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 1. mutator dirties the card (write barrier) 225eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 2. GC ages the card (the above ProcessCards call) 226eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 3. GC scans the object (the RecursiveMarkDirtyObjects call below) 227eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 4. mutator writes the value (corresponding to the write barrier in 1.) 228eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // This causes the GC to age the card but not necessarily mark the reference which the mutator 229eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // wrote into the object stored in the card. 230eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // Having the checkpoint fixes this issue since it ensures that the card mark and the 231eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // reference write are visible to the GC before the card is scanned (this is due to locks being 232eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // acquired / released in the checkpoint code). 233eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The other roots are also marked to help reduce the pause. 2340f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, false); 235dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier MarkNonThreadRoots(); 236893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 237893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagClearRootLog | kVisitRootFlagNewRoots)); 238dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process the newly aged cards. 239dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier RecursiveMarkDirtyObjects(false, accounting::CardTable::kCardDirty - 1); 240dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // TODO: Empty allocation stack to reduce the number of objects we need to test / mark as live 241dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // in the next GC. 242dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier } 243dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier} 244dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier 245c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartiervoid MarkSweep::RevokeAllThreadLocalAllocationStacks(Thread* self) { 246c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier if (kUseThreadLocalAllocationStack) { 247f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 248c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 249c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier heap_->RevokeAllThreadLocalAllocationStacks(self); 250c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier } 251c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier} 252c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier 2532b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkingPhase() { 254f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 2552b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 2562b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier BindBitmaps(); 2570e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier FindDefaultSpaceBitmap(); 2582b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Process dirty cards and add dirty cards to mod union tables. 2594add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li // If the GC type is non sticky, then we just clear the cards instead of ageing them. 2604add3b4fa38ec42bb3c71d01cf70bce8e9a9fb4eLei Li heap_->ProcessCards(GetTimings(), false, true, GetGcType() != kGcTypeSticky); 2612b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 262893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkRoots(self); 2632b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkReachableObjects(); 264dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Pre-clean dirtied cards to reduce pauses. 265dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier PreCleanCards(); 2662b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2672b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 26811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartiervoid MarkSweep::UpdateAndMarkModUnion() { 26911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier for (const auto& space : heap_->GetContinuousSpaces()) { 2708d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsSpace(space)) { 27111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier const char* name = space->IsZygoteSpace() ? "UpdateAndMarkZygoteModUnionTable" : 27211409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier "UpdateAndMarkImageModUnionTable"; 273f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(name, GetTimings()); 27411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier accounting::ModUnionTable* mod_union_table = heap_->FindModUnionTableFromSpace(space); 27511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier CHECK(mod_union_table != nullptr); 276407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mod_union_table->UpdateAndMarkReferences(MarkHeapReferenceCallback, this); 27711409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 27811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 27911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier} 28011409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier 2812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkReachableObjects() { 2824aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier UpdateAndMarkModUnion(); 2832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Recursively mark all the non-image bits set in the mark bitmap. 2842b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier RecursiveMark(); 2852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2862b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ReclaimPhase() { 288f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 289720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 29078f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Process the references concurrently. 29178f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier ProcessReferences(self); 2920f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier SweepSystemWeaks(self); 2936f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Runtime::Current()->AllowNewSystemWeaks(); 2942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier { 2952b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 2964460a84be92b5a94ecfb5c650aef4945ab849c93Hiroshi Yamauchi GetHeap()->RecordFreeRevoke(); 2972b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Reclaim unmarked objects. 2981d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Sweep(false); 2992b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Swap the live and mark bitmaps for each space which we modified space. This is an 3002b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // optimization that enables us to not clear live bits inside of the sweep. Only swaps unbound 3012b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // bitmaps. 3022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SwapBitmaps(); 3032b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Unbind the live and mark bitmaps. 304a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier GetHeap()->UnBindBitmaps(); 3052b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 3062b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 3072b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3080e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartiervoid MarkSweep::FindDefaultSpaceBitmap() { 309f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 31002e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 311a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap = space->GetMarkBitmap(); 312bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // We want to have the main space instead of non moving if possible. 313590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (bitmap != nullptr && 314590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) { 3150e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = bitmap; 316bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // If we are not the non moving space exit the loop early since this will be good enough. 317bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (space != heap_->GetNonMovingSpace()) { 318bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier break; 319bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 320b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 321b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 3224c13a3ff475f206c4d0a86ee2595c45392fd942fMathieu Chartier CHECK(current_space_bitmap_ != nullptr) << "Could not find a default mark bitmap\n" 3234c13a3ff475f206c4d0a86ee2595c45392fd942fMathieu Chartier << heap_->DumpSpaces(); 32458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 32558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 326ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartiervoid MarkSweep::ExpandMarkStack() { 327ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier ResizeMarkStack(mark_stack_->Capacity() * 2); 328ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier} 329ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier 330ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartiervoid MarkSweep::ResizeMarkStack(size_t new_size) { 331ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Rare case, no need to have Thread::Current be a parameter. 332ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (UNLIKELY(mark_stack_->Size() < mark_stack_->Capacity())) { 333ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Someone else acquired the lock and expanded the mark stack before us. 334ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier return; 335ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 336cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier std::vector<StackReference<Object>> temp(mark_stack_->Begin(), mark_stack_->End()); 337ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier CHECK_LE(mark_stack_->Size(), new_size); 338ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier mark_stack_->Resize(new_size); 339cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier for (auto& obj : temp) { 340cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier mark_stack_->PushBack(obj.AsMirrorPtr()); 341ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 342ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 343ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 3440e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::MarkObjectNonNullParallel(Object* obj) { 345bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(obj != nullptr); 346ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (MarkObjectParallel(obj)) { 347ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 348ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 349184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier ExpandMarkStack(); 350ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 351ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier // The object must be pushed on to the mark stack. 3520e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 353ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 354ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 355ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 3563bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartiermirror::Object* MarkSweep::MarkObjectCallback(mirror::Object* obj, void* arg) { 35739e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier MarkSweep* mark_sweep = reinterpret_cast<MarkSweep*>(arg); 35839e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier mark_sweep->MarkObject(obj); 35939e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier return obj; 36039e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier} 36139e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier 362407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::MarkHeapReferenceCallback(mirror::HeapReference<mirror::Object>* ref, void* arg) { 363407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObject(ref->AsMirrorPtr()); 364407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier} 365407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 366308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartierbool MarkSweep::HeapReferenceMarkedCallback(mirror::HeapReference<mirror::Object>* ref, void* arg) { 367308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier return reinterpret_cast<MarkSweep*>(arg)->IsMarked(ref->AsMirrorPtr()); 368308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier} 369308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier 370bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartierclass MarkSweepMarkObjectSlowPath { 371bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier public: 372eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi explicit MarkSweepMarkObjectSlowPath(MarkSweep* mark_sweep, Object* holder = nullptr, 373eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MemberOffset offset = MemberOffset(0)) 374eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi : mark_sweep_(mark_sweep), holder_(holder), offset_(offset) { 375bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 376bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 377d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi void operator()(const Object* obj) const ALWAYS_INLINE NO_THREAD_SAFETY_ANALYSIS { 378bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kProfileLargeObjects) { 379bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: Differentiate between marking and testing somehow. 380bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_test_; 381bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_mark_; 382bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 383bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier space::LargeObjectSpace* large_object_space = mark_sweep_->GetHeap()->GetLargeObjectsSpace(); 384a17288e3b9dd6751005fed3386251d2d0949be74Mathieu Chartier if (UNLIKELY(obj == nullptr || !IsAligned<kPageSize>(obj) || 3852dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier (kIsDebugBuild && large_object_space != nullptr && 3862dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier !large_object_space->Contains(obj)))) { 387175746ac9039e9b741d3521420dcaa9c59341738Mathieu Chartier LOG(INTERNAL_FATAL) << "Tried to mark " << obj << " not contained by any spaces"; 388eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi if (holder_ != nullptr) { 389d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi size_t holder_size = holder_->SizeOf(); 390eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi ArtField* field = holder_->FindFieldByOffset(offset_); 391d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi LOG(INTERNAL_FATAL) << "Field info: " 392d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " holder=" << holder_ 393679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << " holder is " 394679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << (mark_sweep_->GetHeap()->IsLiveObjectLocked(holder_) 395679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi ? "alive" : "dead") 396d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " holder_size=" << holder_size 397eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi << " holder_type=" << PrettyTypeOf(holder_) 398eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi << " offset=" << offset_.Uint32Value() 399d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " field=" << (field != nullptr ? field->GetName() : "nullptr") 400d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " field_type=" 401d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (field != nullptr ? field->GetTypeDescriptor() : "") 402d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " first_ref_field_offset=" 403d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (holder_->IsClass() 404e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier ? holder_->AsClass()->GetFirstReferenceStaticFieldOffset( 405e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier sizeof(void*)) 406d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi : holder_->GetClass()->GetFirstReferenceInstanceFieldOffset()) 407d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << " num_of_ref_fields=" 408d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << (holder_->IsClass() 409d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi ? holder_->AsClass()->NumReferenceStaticFields() 410d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi : holder_->GetClass()->NumReferenceInstanceFields()) 411d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi << "\n"; 412679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi // Print the memory content of the holder. 413679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi for (size_t i = 0; i < holder_size / sizeof(uint32_t); ++i) { 414679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi uint32_t* p = reinterpret_cast<uint32_t*>(holder_); 415679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi LOG(INTERNAL_FATAL) << &p[i] << ": " << "holder+" << (i * sizeof(uint32_t)) << " = " 416679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi << std::hex << p[i]; 417679b1cf291f364dcc3a142f53a07b0ad15c01e9aHiroshi Yamauchi } 418eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi } 419d38ec80b163af1639fbaae382a319c73be67c560Hiroshi Yamauchi PrintFileToLog("/proc/self/maps", LogSeverity::INTERNAL_FATAL); 42017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko MemMap::DumpMaps(LOG(INTERNAL_FATAL), true); 421d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi { 422d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi LOG(INTERNAL_FATAL) << "Attempting see if it's a bad root"; 423d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Thread* self = Thread::Current(); 424d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 425d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi mark_sweep_->VerifyRoots(); 426d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } else { 427d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi const bool heap_bitmap_exclusive_locked = 428d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->IsExclusiveHeld(self); 429d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (heap_bitmap_exclusive_locked) { 430d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 431d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 432d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::mutator_lock_->SharedUnlock(self); 433d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi ThreadList* tl = Runtime::Current()->GetThreadList(); 434d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi tl->SuspendAll(__FUNCTION__); 435d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi mark_sweep_->VerifyRoots(); 436d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi tl->ResumeAll(); 437d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::mutator_lock_->SharedLock(self); 438d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi if (heap_bitmap_exclusive_locked) { 439d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi Locks::heap_bitmap_lock_->ExclusiveLock(self); 440d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 441d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 442d0c8412c3b87317074e8e809198207cd75ee73c4Hiroshi Yamauchi } 443bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(FATAL) << "Can't mark invalid object"; 444bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 445bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 446bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 447bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier private: 448bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweep* const mark_sweep_; 449eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi mirror::Object* const holder_; 450eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MemberOffset offset_; 451bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier}; 452bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 453eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchiinline void MarkSweep::MarkObjectNonNull(Object* obj, Object* holder, MemberOffset offset) { 4540e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 455624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 456624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 457624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 4589d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 4598d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 4600e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4610e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_immune_count_; 4620e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 463bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(mark_bitmap_->Test(obj)); 464bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else if (LIKELY(current_space_bitmap_->HasAddress(obj))) { 465bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kCountMarkedObjects) { 466bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_fastpath_count_; 467bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 468bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (UNLIKELY(!current_space_bitmap_->Set(obj))) { 469bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // This object was not previously marked. 470bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 471bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else { 4720e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4730e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_slowpath_count_; 4740e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 475eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MarkSweepMarkObjectSlowPath visitor(this, holder, offset); 476bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: We already know that the object is not in the current_space_bitmap_ but MarkBitmap::Set 477bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // will check again. 478bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (!mark_bitmap_->Set(obj, visitor)) { 479bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // Was not already marked, push. 480357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 4810e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 4820e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier} 4830e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier 4840e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::PushOnMarkStack(Object* obj) { 4850e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 4860e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // Lock is not needed but is here anyways to please annotalysis. 4870e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 4880e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ExpandMarkStack(); 48969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 4900e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // The object must be pushed on to the mark stack. 4910e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 49269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 49369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 49402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierinline bool MarkSweep::MarkObjectParallel(const Object* obj) { 4950e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 496624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 497624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 498624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 4999d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 5008d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 50102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier DCHECK(IsMarked(obj)); 50202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 50302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 50402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 50502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // the hard way. 506a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* object_bitmap = current_space_bitmap_; 507bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (LIKELY(object_bitmap->HasAddress(obj))) { 508bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !object_bitmap->AtomicTestAndSet(obj); 50902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 510bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweepMarkObjectSlowPath visitor(this); 511bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !mark_bitmap_->AtomicTestAndSet(obj, visitor); 51202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 51302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 5140e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier// Used to mark objects when processing the mark stack. If an object is null, it is not marked. 515eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchiinline void MarkSweep::MarkObject(Object* obj, Object* holder, MemberOffset offset) { 5160e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (obj != nullptr) { 517eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi MarkObjectNonNull(obj, holder, offset); 5180e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } else if (kCountMarkedObjects) { 5190e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_null_count_; 52069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 52169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 52269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 523bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass VerifyRootMarkedVisitor : public SingleRootVisitor { 524bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier public: 525bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier explicit VerifyRootMarkedVisitor(MarkSweep* collector) : collector_(collector) { } 526ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 527bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE 528bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 529bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier CHECK(collector_->IsMarked(root)) << info.ToString(); 530bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 531bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 532bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier private: 533bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkSweep* const collector_; 534bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier}; 535893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier 536bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartiervoid MarkSweep::VisitRoots(mirror::Object*** roots, size_t count, 537bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) { 538bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 539bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkObjectNonNull(*roots[i]); 540bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 541815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier} 542815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier 543bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartiervoid MarkSweep::VisitRoots(mirror::CompressedReference<mirror::Object>** roots, size_t count, 544bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) { 545bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 546bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier MarkObjectNonNull(roots[i]->AsMirrorPtr()); 547bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 5486f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5496f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 550bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass VerifyRootVisitor : public SingleRootVisitor { 551bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier public: 552bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoot(mirror::Object* root, const RootInfo& info) OVERRIDE 553bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 5549086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier // See if the root is on any space bitmap. 5559086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier auto* heap = Runtime::Current()->GetHeap(); 5569086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier if (heap->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == nullptr) { 5579086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier space::LargeObjectSpace* large_object_space = heap->GetLargeObjectsSpace(); 5589086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier if (large_object_space != nullptr && !large_object_space->Contains(root)) { 559175746ac9039e9b741d3521420dcaa9c59341738Mathieu Chartier LOG(INTERNAL_FATAL) << "Found invalid root: " << root << " " << info; 5609086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier } 5616f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5626f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5639086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier}; 5646f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 5656f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRoots() { 5669086b65b2ad35dd39a8afc62d535be8217208d08Mathieu Chartier VerifyRootVisitor visitor; 567bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->GetThreadList()->VisitRoots(&visitor); 5686f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5696f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 570893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkRoots(Thread* self) { 571f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 572893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 573893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // If we exclusively hold the mutator lock, all threads must be suspended. 574bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(this); 575893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 576893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } else { 5770f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, kRevokeRosAllocThreadLocalBuffersAtCheckpoint); 578893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // At this point the live stack should no longer have any mutators which push into it. 579893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkNonThreadRoots(); 580893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 581893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagAllRoots | kVisitRootFlagStartLoggingNewRoots)); 582893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 5839ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier} 5849ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier 585858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartiervoid MarkSweep::MarkNonThreadRoots() { 586f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 587bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitNonThreadRoots(this); 588858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 589858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 590893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkConcurrentRoots(VisitRootFlags flags) { 591f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 5921d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Visit all runtime roots and clear dirty flags. 593bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitConcurrentRoots(this, flags); 59469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 59569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 59602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass ScanObjectVisitor { 597cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier public: 59894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE 59994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep) {} 600cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 601407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj) const ALWAYS_INLINE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 602407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 60394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 6042b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 6052b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 6062b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 60702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_sweep_->ScanObject(obj); 608cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 609cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 610cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier private: 611cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier MarkSweep* const mark_sweep_; 612cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 613cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 614407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartierclass DelayReferenceReferentVisitor { 615407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 616407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit DelayReferenceReferentVisitor(MarkSweep* collector) : collector_(collector) { 617407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 618407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 619407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(mirror::Class* klass, mirror::Reference* ref) const 620407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 621407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 622407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier collector_->DelayReferenceReferent(klass, ref); 623407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 624407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 625407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 626407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const collector_; 627407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier}; 628407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 62994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiertemplate <bool kUseFinger = false> 63094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass MarkStackTask : public Task { 63194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 63294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, size_t mark_stack_size, 633cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier StackReference<Object>* mark_stack) 63494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep), 63594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_(thread_pool), 63694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_(mark_stack_size) { 63794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We may have to copy part of an existing mark stack when another mark stack overflows. 63894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_size != 0) { 6392cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier DCHECK(mark_stack != nullptr); 64094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Check performance? 64194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier std::copy(mark_stack, mark_stack + mark_stack_size, mark_stack_); 64294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 64394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 64494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_created_; 6451d54e73444e017d3a65234e0f193846f3e27472bIan Rogers } 646262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier } 647262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 64894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kMaxSize = 1 * KB; 649cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 65094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 651407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier class MarkObjectParallelVisitor { 652407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 653407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit MarkObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task, 654407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* mark_sweep) ALWAYS_INLINE 655407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier : chunk_task_(chunk_task), mark_sweep_(mark_sweep) {} 656407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 657407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj, MemberOffset offset, bool /* static */) const ALWAYS_INLINE 658407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 659b0fa5dc7769c1e054032f39de0a3f6d6dd06f8cfIan Rogers mirror::Object* ref = obj->GetFieldObject<mirror::Object>(offset); 660407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (ref != nullptr && mark_sweep_->MarkObjectParallel(ref)) { 661407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (kUseFinger) { 662c7df66e2cb124d261cf3b0691a09a3b6e357b6f1Yabin Cui std::atomic_thread_fence(std::memory_order_seq_cst); 663407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (reinterpret_cast<uintptr_t>(ref) >= 6643e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers static_cast<uintptr_t>(mark_sweep_->atomic_finger_.LoadRelaxed())) { 665407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier return; 666407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 667407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 668407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier chunk_task_->MarkStackPush(ref); 669407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 670407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 671407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 672407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 673407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 674407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep_; 675407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier }; 676407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 67794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier class ScanObjectParallelVisitor { 67894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 67994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task) ALWAYS_INLINE 68094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : chunk_task_(chunk_task) {} 68194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 682407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier // No thread safety analysis since multiple threads will use this visitor. 683407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj) const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 684407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 685407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep = chunk_task_->mark_sweep_; 686407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectParallelVisitor mark_visitor(chunk_task_, mark_sweep); 687407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(mark_sweep); 688407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mark_sweep->ScanObjectVisit(obj, mark_visitor, ref_visitor); 68994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 69094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 69194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier private: 69294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 69394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier }; 69494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 69594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual ~MarkStackTask() { 69694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Make sure that we have cleared our mark stack. 69794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_EQ(mark_stack_pos_, 0U); 69894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 69994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_deleted_; 7002b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 701cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 702cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 70394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkSweep* const mark_sweep_; 70494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* const thread_pool_; 70594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Thread local mark stack for this task. 706cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier StackReference<Object> mark_stack_[kMaxSize]; 70794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack position. 70894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_pos_; 70994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 710cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier ALWAYS_INLINE void MarkStackPush(Object* obj) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 71194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == kMaxSize)) { 71294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack overflow, give 1/2 the stack to the thread pool as a new work task. 71394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_ /= 2; 71494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new MarkStackTask(thread_pool_, mark_sweep_, kMaxSize - mark_stack_pos_, 71594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_ + mark_stack_pos_); 71694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_->AddTask(Thread::Current(), task); 71794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 71894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != nullptr); 7190e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_LT(mark_stack_pos_, kMaxSize); 720cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier mark_stack_[mark_stack_pos_++].Assign(obj); 72194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 72294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 72394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 72494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 72594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 72694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 72794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 728407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier virtual void Run(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 729407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 7306a3c1fcb4ba42ad4d5d142c17a3712a6ddd3866fIan Rogers UNUSED(self); 73194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 73294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 73394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 7340e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier BoundedFifoPowerOfTwo<Object*, kFifoSize> prefetch_fifo; 73594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (;;) { 7360e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object* obj = nullptr; 73794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 73894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (mark_stack_pos_ != 0 && prefetch_fifo.size() < kFifoSize) { 739cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier Object* const mark_stack_obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); 740277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe DCHECK(mark_stack_obj != nullptr); 741277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe __builtin_prefetch(mark_stack_obj); 742277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe prefetch_fifo.push_back(mark_stack_obj); 74394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 74494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(prefetch_fifo.empty())) { 74594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 74694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 74794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 74894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 74994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 75094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == 0)) { 75194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 75294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 753cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier obj = mark_stack_[--mark_stack_pos_].AsMirrorPtr(); 75494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 75511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 7560e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier visitor(obj); 75794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 75894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 75994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 76094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 76194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass CardScanTask : public MarkStackTask<false> { 76294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 763a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier CardScanTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 764a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, 76513735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* begin, uint8_t* end, uint8_t minimum_age, size_t mark_stack_size, 766cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier StackReference<Object>* mark_stack_obj, bool clear_card) 76794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, mark_stack_size, mark_stack_obj), 76894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 76994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 77094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end), 771727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age_(minimum_age), clear_card_(clear_card) { 77294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 77394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 77494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 775a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 77613735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const begin_; 77713735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const end_; 77813735955f39b3b304c37d2b2840663c131262c18Ian Rogers const uint8_t minimum_age_; 779727b294b4091cf3cc2f8137cd654552f477fe46aLei Li const bool clear_card_; 78094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 78194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 78294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 78394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 78494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 78594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 78694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 78794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = mark_sweep_->GetHeap()->GetCardTable(); 788727b294b4091cf3cc2f8137cd654552f477fe46aLei Li size_t cards_scanned = clear_card_ ? 789727b294b4091cf3cc2f8137cd654552f477fe46aLei Li card_table->Scan<true>(bitmap_, begin_, end_, visitor, minimum_age_) : 790727b294b4091cf3cc2f8137cd654552f477fe46aLei Li card_table->Scan<false>(bitmap_, begin_, end_, visitor, minimum_age_); 7910f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier VLOG(heap) << "Parallel scanning cards " << reinterpret_cast<void*>(begin_) << " - " 7920f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier << reinterpret_cast<void*>(end_) << " = " << cards_scanned; 79394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 79494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 79594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 796cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 797cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 7982775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiersize_t MarkSweep::GetThreadCount(bool paused) const { 7992775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (heap_->GetThreadPool() == nullptr || !heap_->CareAboutPauseTimes()) { 800bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return 1; 8012775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 80210d6886c9ce3ed87431cf10d376a69c23950fa61Mathieu Chartier return (paused ? heap_->GetParallelGCThreadCount() : heap_->GetConcGCThreadCount()) + 1; 8032775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier} 8042775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier 80513735955f39b3b304c37d2b2840663c131262c18Ian Rogersvoid MarkSweep::ScanGrayObjects(bool paused, uint8_t minimum_age) { 80694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = GetHeap()->GetCardTable(); 80794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 8082775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 8092775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier // The parallel version with only one thread is faster for card scanning, TODO: fix. 810bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kParallelCardScan && thread_count > 1) { 811720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 81294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Can't have a different split for each space since multiple spaces can have their cards being 81394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // scanned at the same time. 814f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(paused ? "(Paused)ScanGrayObjects" : __FUNCTION__, 815f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier GetTimings()); 81694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Try to take some of the mark stack since we can pass this off to the worker tasks. 817cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier StackReference<Object>* mark_stack_begin = mark_stack_->Begin(); 818cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier StackReference<Object>* mark_stack_end = mark_stack_->End(); 819720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier const size_t mark_stack_size = mark_stack_end - mark_stack_begin; 82094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Estimated number of work tasks we will create. 82194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_tasks = GetHeap()->GetContinuousSpaces().size() * thread_count; 82294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_NE(mark_stack_tasks, 0U); 82394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_delta = std::min(CardScanTask::kMaxSize / 2, 82494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_size / mark_stack_tasks + 1); 82594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 826590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() == nullptr) { 827590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 828590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 82913735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* card_begin = space->Begin(); 83013735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* card_end = space->End(); 8310941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Align up the end address. For example, the image space's end 8320941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // may not be card-size-aligned. 8330941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi card_end = AlignUp(card_end, accounting::CardTable::kCardSize); 8340941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi DCHECK(IsAligned<accounting::CardTable::kCardSize>(card_begin)); 8350941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi DCHECK(IsAligned<accounting::CardTable::kCardSize>(card_end)); 83694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how many bytes of heap we will scan, 83794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t address_range = card_end - card_begin; 83894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how much address range each task gets. 83994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t card_delta = RoundUp(address_range / thread_count + 1, 84094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable::kCardSize); 841727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // If paused and the space is neither zygote nor image space, we could clear the dirty 842727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // cards to avoid accumulating them to increase card scanning load in the following GC 843727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // cycles. We need to keep dirty cards of image space and zygote space in order to track 844727b294b4091cf3cc2f8137cd654552f477fe46aLei Li // references to the other spaces. 845727b294b4091cf3cc2f8137cd654552f477fe46aLei Li bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); 84694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create the worker tasks for this space. 84794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (card_begin != card_end) { 84894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add a range of cards. 84994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t addr_remaining = card_end - card_begin; 85094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t card_increment = std::min(card_delta, addr_remaining); 85194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Take from the back of the mark stack. 85294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_remaining = mark_stack_end - mark_stack_begin; 85394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining); 85494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_end -= mark_stack_increment; 85594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment)); 8560e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_EQ(mark_stack_end, mark_stack_->End()); 85794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add the new task to the thread pool. 85894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new CardScanTask(thread_pool, this, space->GetMarkBitmap(), card_begin, 85994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin + card_increment, minimum_age, 860727b294b4091cf3cc2f8137cd654552f477fe46aLei Li mark_stack_increment, mark_stack_end, clear_card); 86194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 86294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin += card_increment; 86394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 86494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 8650f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 8660941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Note: the card scan below may dirty new cards (and scan them) 8670941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // as a side effect when a Reference object is encountered and 8680941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // queued during the marking. See b/11465268. 8692775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 87094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 8712775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 87294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 87394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 87494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 875590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() != nullptr) { 876590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Image spaces are handled properly since live == marked for them. 877f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier const char* name = nullptr; 878590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier switch (space->GetGcRetentionPolicy()) { 879f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyNeverCollect: 880f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayImageSpaceObjects" : "ScanGrayImageSpaceObjects"; 881f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 882f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyFullCollect: 883f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayZygoteSpaceObjects" : "ScanGrayZygoteSpaceObjects"; 884f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 885f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier case space::kGcRetentionPolicyAlwaysCollect: 886f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier name = paused ? "(Paused)ScanGrayAllocSpaceObjects" : "ScanGrayAllocSpaceObjects"; 887f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier break; 888f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier default: 889f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier LOG(FATAL) << "Unreachable"; 8902c4257be8191c5eefde744e8965fcefc80a0a97dIan Rogers UNREACHABLE(); 891f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 892f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(name, GetTimings()); 893590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier ScanObjectVisitor visitor(this); 894727b294b4091cf3cc2f8137cd654552f477fe46aLei Li bool clear_card = paused && !space->IsZygoteSpace() && !space->IsImageSpace(); 895727b294b4091cf3cc2f8137cd654552f477fe46aLei Li if (clear_card) { 896727b294b4091cf3cc2f8137cd654552f477fe46aLei Li card_table->Scan<true>(space->GetMarkBitmap(), space->Begin(), space->End(), visitor, 897727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age); 898727b294b4091cf3cc2f8137cd654552f477fe46aLei Li } else { 899727b294b4091cf3cc2f8137cd654552f477fe46aLei Li card_table->Scan<false>(space->GetMarkBitmap(), space->Begin(), space->End(), visitor, 900727b294b4091cf3cc2f8137cd654552f477fe46aLei Li minimum_age); 901727b294b4091cf3cc2f8137cd654552f477fe46aLei Li } 902590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 90394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 90494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 90594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier} 90694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 90794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass RecursiveMarkTask : public MarkStackTask<false> { 90894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 90994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 910a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, uintptr_t begin, uintptr_t end) 9112cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, 0, nullptr), bitmap_(bitmap), begin_(begin), 91294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end) { 91394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 91494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 91594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 916a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 91794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t begin_; 91894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t end_; 91994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 92094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 92194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 92294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 92394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 92494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 92594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 92694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 92794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_->VisitMarkedRange(begin_, end_, visitor); 92894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 92994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 93094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 93194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 93294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 93358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// Populates the mark stack based on the set of marked objects and 93458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// recursively marks until the mark stack is emptied. 9352b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::RecursiveMark() { 936f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 937a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // RecursiveMark will build the lists of known instances of the Reference classes. See 938a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // DelayReferenceReferent for details. 93994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseRecursiveMark) { 94094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const bool partial = GetGcType() == kGcTypePartial; 94194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectVisitor scan_visitor(this); 94294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* self = Thread::Current(); 94394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = heap_->GetThreadPool(); 9442775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(false); 9452775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const bool parallel = kParallelRecursiveMark && thread_count > 1; 94694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->Reset(); 94702e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 9481d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if ((space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) || 9491d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (!partial && space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) { 9500e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = space->GetMarkBitmap(); 9510e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_ == nullptr) { 952590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 9532b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 95494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (parallel) { 95594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We will use the mark stack the future. 95694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // CHECK(mark_stack_->IsEmpty()); 95794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 95894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 95994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 9603e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers atomic_finger_.StoreRelaxed(AtomicInteger::MaxValue()); 96194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 96294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create a few worker tasks. 9632775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t n = thread_count * 2; 96494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (begin != end) { 96594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t start = begin; 96694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t delta = (end - begin) / n; 96794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delta = RoundUp(delta, KB); 96894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (delta < 16 * KB) delta = end - begin; 96994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin += delta; 9700e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier auto* task = new RecursiveMarkTask(thread_pool, this, current_space_bitmap_, start, 97194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin); 97294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 97394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 9742775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 97594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 9762775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 97794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 97894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 97994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 98094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 98194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 9820e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_->VisitMarkedRange(begin, end, scan_visitor); 98394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 984357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 985357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 986357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 98794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(false); 98858551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 98958551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 99083c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartiermirror::Object* MarkSweep::IsMarkedCallback(mirror::Object* object, void* arg) { 9915712d5d04640925970db9c98938ffaf806b3962cMathieu Chartier if (reinterpret_cast<MarkSweep*>(arg)->IsMarked(object)) { 9926aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return object; 9936aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier } 9946aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return nullptr; 995357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 996357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 99713735955f39b3b304c37d2b2840663c131262c18Ian Rogersvoid MarkSweep::RecursiveMarkDirtyObjects(bool paused, uint8_t minimum_age) { 99894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanGrayObjects(paused, minimum_age); 99994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(paused); 1000262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier} 1001262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 100258551df3c2646ed507feec9e9eb3768085a76059Carl Shapirovoid MarkSweep::ReMarkRoots() { 1003f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1004893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(Thread::Current()); 1005bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(this, static_cast<VisitRootFlags>( 1006bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier kVisitRootFlagNewRoots | kVisitRootFlagStopLoggingNewRoots | kVisitRootFlagClearRootLog)); 10077bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier if (kVerifyRootsMarked) { 1008277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("(Paused)VerifyRoots", GetTimings()); 1009bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier VerifyRootMarkedVisitor visitor(this); 1010bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Runtime::Current()->VisitRoots(&visitor); 1011893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 101258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 101358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 10140f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::SweepSystemWeaks(Thread* self) { 1015f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 10160f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 10170f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier Runtime::Current()->SweepSystemWeaks(IsMarkedCallback, this); 101869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 101969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 10206aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartiermirror::Object* MarkSweep::VerifySystemWeakIsLiveCallback(Object* obj, void* arg) { 1021c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->VerifyIsLive(obj); 1022c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier // We don't actually want to sweep the object, so lets return "marked" 10236aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return obj; 1024c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1025c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1026c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifyIsLive(const Object* obj) { 10274aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier if (!heap_->GetLiveBitmap()->Test(obj)) { 1028cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier // TODO: Consider live stack? Has this code bitrotted? 1029cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier CHECK(!heap_->allocation_stack_->Contains(obj)) 1030cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier << "Found dead object " << obj << "\n" << heap_->DumpSpaces(); 1031c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 1032c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1033c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1034c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifySystemWeaks() { 1035f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 10366aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier // Verify system weaks, uses a special object visitor which returns the input object. 10376aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier Runtime::Current()->SweepSystemWeaks(VerifySystemWeakIsLiveCallback, this); 1038c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 1039c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 1040bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartierclass CheckpointMarkThreadRoots : public Closure, public RootVisitor { 1041858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier public: 10420f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier explicit CheckpointMarkThreadRoots(MarkSweep* mark_sweep, 10430f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) 10440f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier : mark_sweep_(mark_sweep), 10450f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint_( 10460f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 10470f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier } 1048858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1049bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoots(mirror::Object*** roots, size_t count, const RootInfo& info ATTRIBUTE_UNUSED) 1050bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1051bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 1052bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 1053bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier mark_sweep_->MarkObjectNonNullParallel(*roots[i]); 1054bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1055bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1056bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 1057bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier void VisitRoots(mirror::CompressedReference<mirror::Object>** roots, size_t count, 1058bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier const RootInfo& info ATTRIBUTE_UNUSED) 1059bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1060bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 1061bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier for (size_t i = 0; i < count; ++i) { 1062bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier mark_sweep_->MarkObjectNonNullParallel(roots[i]->AsMirrorPtr()); 1063bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1064bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier } 1065bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier 10664aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier virtual void Run(Thread* thread) OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 10673f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_BEGIN("Marking thread roots"); 1068858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier // Note: self is not necessarily equal to thread since thread may be suspended. 1069bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier Thread* const self = Thread::Current(); 1070d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier CHECK(thread == self || thread->IsSuspended() || thread->GetState() == kWaitingPerformingGc) 1071d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << thread->GetState() << " thread " << thread << " self " << self; 1072bb87e0f1a52de656bc77cb01cb887e51a0e5198bMathieu Chartier thread->VisitRoots(this); 10733f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_END(); 10740f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (revoke_ros_alloc_thread_local_buffers_at_checkpoint_) { 10750f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_BEGIN("RevokeRosAllocThreadLocalBuffers"); 1076c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi mark_sweep_->GetHeap()->RevokeRosAllocThreadLocalBuffers(thread); 10770f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_END(); 1078c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1079dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // If thread is a running mutator, then act on behalf of the garbage collector. 1080dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // See the code in ThreadList::RunCheckpoint. 1081dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li if (thread->GetState() == kRunnable) { 1082dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li mark_sweep_->GetBarrier().Pass(self); 1083dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li } 1084858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier } 1085858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1086858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier private: 10874aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier MarkSweep* const mark_sweep_; 10880f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier const bool revoke_ros_alloc_thread_local_buffers_at_checkpoint_; 1089858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier}; 1090858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 10910f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::MarkRootsCheckpoint(Thread* self, 10920f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 1093f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 10940f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CheckpointMarkThreadRoots check_point(this, revoke_ros_alloc_thread_local_buffers_at_checkpoint); 1095858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 10961d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Request the check point is run on all threads returning a count of the threads that must 10971d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // run through the barrier including self. 10981d54e73444e017d3a65234e0f193846f3e27472bIan Rogers size_t barrier_count = thread_list->RunCheckpoint(&check_point); 10991d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Release locks then wait for all mutator threads to pass the barrier. 1100dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // If there are no threads to wait which implys that all the checkpoint functions are finished, 1101dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li // then no need to release locks. 1102dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li if (barrier_count == 0) { 1103dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li return; 1104dd9943d4466b052ef6c5ee5b32187adb48cbce74Lei Li } 11051d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 11061d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedUnlock(self); 11074aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier { 11084aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier ScopedThreadStateChange tsc(self, kWaitingForCheckPointsToRun); 11094aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier gc_barrier_->Increment(self, barrier_count); 11104aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier } 11111d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedLock(self); 11121d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveLock(self); 1113858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 1114858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 11151d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::SweepArray(accounting::ObjectStack* allocations, bool swap_bitmaps) { 1116f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1117e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Thread* self = Thread::Current(); 1118bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi mirror::Object** chunk_free_buffer = reinterpret_cast<mirror::Object**>( 1119bbdc5bc5fd5141711879a6c85d80ac45b7aad5d0Hiroshi Yamauchi sweep_array_free_buffer_mem_map_->BaseBegin()); 1120e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t chunk_free_pos = 0; 112110fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier ObjectBytePair freed; 112210fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier ObjectBytePair freed_los; 1123e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // How many objects are left in the array, modified after each space is swept. 1124cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier StackReference<Object>* objects = allocations->Begin(); 1125e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t count = allocations->Size(); 1126e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Change the order to ensure that the non-moving space last swept as an optimization. 1127e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::vector<space::ContinuousSpace*> sweep_spaces; 1128e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::ContinuousSpace* non_moving_space = nullptr; 1129e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : heap_->GetContinuousSpaces()) { 11308d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (space->IsAllocSpace() && !immune_region_.ContainsSpace(space) && 11318d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier space->GetLiveBitmap() != nullptr) { 1132e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space == heap_->GetNonMovingSpace()) { 1133e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier non_moving_space = space; 1134e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1135e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(space); 1136e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1137e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1138e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1139e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Unlikely to sweep a significant amount of non_movable objects, so we do these after the after 1140e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the other alloc spaces as an optimization. 1141e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (non_moving_space != nullptr) { 1142e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(non_moving_space); 1143e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1144e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Start by sweeping the continuous spaces. 1145e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : sweep_spaces) { 1146e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::AllocSpace* alloc_space = space->AsAllocSpace(); 1147a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* live_bitmap = space->GetLiveBitmap(); 1148a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); 1149e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (swap_bitmaps) { 1150e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::swap(live_bitmap, mark_bitmap); 1151e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1152cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier StackReference<Object>* out = objects; 1153e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (size_t i = 0; i < count; ++i) { 1154cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier Object* const obj = objects[i].AsMirrorPtr(); 1155f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1156f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1157f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1158e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space->HasAddress(obj)) { 1159e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // This object is in the space, remove it from the array and add it to the sweep buffer 1160e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // if needed. 1161e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!mark_bitmap->Test(obj)) { 1162e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos >= kSweepArrayChunkFreeSize) { 1163277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("FreeList", GetTimings()); 116410fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.objects += chunk_free_pos; 116510fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1166e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1167e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1168e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_buffer[chunk_free_pos++] = obj; 1169e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1170e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1171cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier (out++)->Assign(obj); 1172e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1173e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1174e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos > 0) { 1175277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("FreeList", GetTimings()); 117610fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.objects += chunk_free_pos; 117710fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier freed.bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1178e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1179e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1180e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // All of the references which space contained are no longer in the allocation stack, update 1181e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the count. 1182e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier count = out - objects; 1183e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1184e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle the large object space. 11851d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 11862dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (large_object_space != nullptr) { 11872dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier accounting::LargeObjectBitmap* large_live_objects = large_object_space->GetLiveBitmap(); 11882dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier accounting::LargeObjectBitmap* large_mark_objects = large_object_space->GetMarkBitmap(); 11892dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (swap_bitmaps) { 11902dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier std::swap(large_live_objects, large_mark_objects); 1191f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 11922dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier for (size_t i = 0; i < count; ++i) { 1193cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier Object* const obj = objects[i].AsMirrorPtr(); 11942dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier // Handle large objects. 11952dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (kUseThreadLocalAllocationStack && obj == nullptr) { 11962dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier continue; 11972dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 11982dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (!large_mark_objects->Test(obj)) { 11992dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier ++freed_los.objects; 12002dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier freed_los.bytes += large_object_space->Free(self, obj); 12012dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 1202357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1203357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1204f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier { 1205277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe TimingLogger::ScopedTiming t2("RecordFree", GetTimings()); 1206f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier RecordFree(freed); 1207f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier RecordFreeLOS(freed_los); 1208277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe t2.NewTiming("ResetStack"); 1209f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier allocations->Reset(); 1210f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 1211c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers sweep_array_free_buffer_mem_map_->MadviseDontNeedAndZero(); 1212357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 1213357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 12141d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::Sweep(bool swap_bitmaps) { 1215f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 12160f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Ensure that nobody inserted items in the live stack after we swapped the stacks. 12170f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CHECK_GE(live_stack_freeze_size_, GetHeap()->GetLiveStack()->Size()); 1218f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier { 1219f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t2("MarkAllocStackAsLive", GetTimings()); 1220f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier // Mark everything allocated since the last as GC live so that we can sweep concurrently, 1221f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier // knowing that new allocations won't be marked as live. 1222f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier accounting::ObjectStack* live_stack = heap_->GetLiveStack(); 1223f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier heap_->MarkAllocStackAsLive(live_stack); 1224f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier live_stack->Reset(); 1225f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier DCHECK(mark_stack_->IsEmpty()); 1226f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier } 122702e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1228a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier if (space->IsContinuousMemMapAllocSpace()) { 1229a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); 1230f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming split( 123110fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier alloc_space->IsZygoteSpace() ? "SweepZygoteSpace" : "SweepMallocSpace", GetTimings()); 123210fb83ad7442c8cf3356a89ec918e0786f110981Mathieu Chartier RecordFree(alloc_space->Sweep(swap_bitmaps)); 123358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 123458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 12352b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SweepLargeObjects(swap_bitmaps); 123658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 123758551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 1238e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartiervoid MarkSweep::SweepLargeObjects(bool swap_bitmaps) { 12392dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier space::LargeObjectSpace* los = heap_->GetLargeObjectsSpace(); 12402dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier if (los != nullptr) { 12412dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier TimingLogger::ScopedTiming split(__FUNCTION__, GetTimings()); 12422dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier RecordFreeLOS(los->Sweep(swap_bitmaps)); 12432dbe627954fd78a3659ab3cd42d2ead5b4529441Mathieu Chartier } 1244e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier} 1245e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier 1246407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// Process the "referent" field in a java.lang.ref.Reference. If the referent has not yet been 1247407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// marked, put it on the appropriate list in the heap for later processing. 1248407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::DelayReferenceReferent(mirror::Class* klass, mirror::Reference* ref) { 12490e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountJavaLangRefs) { 12500e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++reference_count_; 12510e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 1252308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier heap_->GetReferenceProcessor()->DelayReferenceReferent(klass, ref, &HeapReferenceMarkedCallback, 1253308351ada0008b0cbe1a5afc31c302c975554ee4Mathieu Chartier this); 125469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 125569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 125602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass MarkObjectVisitor { 125702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier public: 1258407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit MarkObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE : mark_sweep_(mark_sweep) { 1259407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 126002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 1261407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj, MemberOffset offset, bool /* is_static */) const 1262407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ALWAYS_INLINE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1263407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 126494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 12652b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 12662b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 12672b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1268eb2baaf20d9059c0fc38141780ec05bea0486c40Hiroshi Yamauchi mark_sweep_->MarkObject(obj->GetFieldObject<mirror::Object>(offset), obj, offset); 126902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 127002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 127102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier private: 127202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MarkSweep* const mark_sweep_; 127302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier}; 127402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 127569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Scans an object reference. Determines the type of the reference 127669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// and dispatches to a specialized scanning routine. 1277590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartiervoid MarkSweep::ScanObject(Object* obj) { 1278407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectVisitor mark_visitor(this); 1279407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(this); 1280407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ScanObjectVisit(obj, mark_visitor, ref_visitor); 128102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 128202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 128378f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartiervoid MarkSweep::ProcessMarkStackCallback(void* arg) { 128478f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->ProcessMarkStack(false); 12853bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier} 12863bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier 12872775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiervoid MarkSweep::ProcessMarkStackParallel(size_t thread_count) { 128802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier Thread* self = Thread::Current(); 128902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 12902775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t chunk_size = std::min(mark_stack_->Size() / thread_count + 1, 12912775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier static_cast<size_t>(MarkStackTask<false>::kMaxSize)); 129294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier CHECK_GT(chunk_size, 0U); 129394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Split the current mark stack up into work tasks. 1294cb535da36915f9d10bec3880b46f1de1f7a69f22Mathieu Chartier for (auto* it = mark_stack_->Begin(), *end = mark_stack_->End(); it < end; ) { 129594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t delta = std::min(static_cast<size_t>(end - it), chunk_size); 12960e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier thread_pool->AddTask(self, new MarkStackTask<false>(thread_pool, this, delta, it)); 129794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier it += delta; 129802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 12992775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 130002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier thread_pool->StartWorkers(self); 13012775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 130294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 130302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_stack_->Reset(); 13043e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers CHECK_EQ(work_chunks_created_.LoadSequentiallyConsistent(), 13053e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers work_chunks_deleted_.LoadSequentiallyConsistent()) 13063e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " some of the work chunks were leaked"; 130769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 130869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 13095d76c435082332ef79a22962386fa92a0870e378Ian Rogers// Scan anything that's on the mark stack. 131094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ProcessMarkStack(bool paused) { 1311f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(paused ? "(Paused)ProcessMarkStack" : __FUNCTION__, GetTimings()); 13122775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 13132775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelProcessMarkStack && thread_count > 1 && 13142775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier mark_stack_->Size() >= kMinimumParallelMarkStackSize) { 13152775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier ProcessMarkStackParallel(thread_count); 131694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 131794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 131894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 1319590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier BoundedFifoPowerOfTwo<Object*, kFifoSize> prefetch_fifo; 1320d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier for (;;) { 13212cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier Object* obj = nullptr; 132294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 132394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (!mark_stack_->IsEmpty() && prefetch_fifo.size() < kFifoSize) { 1324277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe Object* mark_stack_obj = mark_stack_->PopBack(); 13252cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier DCHECK(mark_stack_obj != nullptr); 1326277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe __builtin_prefetch(mark_stack_obj); 1327277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe prefetch_fifo.push_back(mark_stack_obj); 132894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 132994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (prefetch_fifo.empty()) { 133094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 133194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 133294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 133394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 133494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 133594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_->IsEmpty()) { 133694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 133794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 133894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_->PopBack(); 1339d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier } 13404aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier DCHECK(obj != nullptr); 1341d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier ScanObject(obj); 1342357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1343357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 134469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 134569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 134652e4b43d62896b56f8c2bd041e528472bb4a0d8dMathieu Chartierinline bool MarkSweep::IsMarked(const Object* object) const { 13478d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(object)) { 13487469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier return true; 13497469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 13500e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_->HasAddress(object)) { 13510e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier return current_space_bitmap_->Test(object); 13527469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 13530e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier return mark_bitmap_->Test(object); 13547469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier} 13557469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier 13562b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::FinishPhase() { 1357f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1358d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountScannedTypes) { 13593e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "MarkSweep scanned classes=" << class_count_.LoadRelaxed() 13603e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " arrays=" << array_count_.LoadRelaxed() << " other=" << other_count_.LoadRelaxed(); 136102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 136202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kCountTasks) { 13633e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Total number of work chunks allocated: " << work_chunks_created_.LoadRelaxed(); 136402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 136502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kMeasureOverhead) { 13663e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Overhead time " << PrettyDuration(overhead_time_.LoadRelaxed()); 136702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 136802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 13693e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Large objects tested " << large_object_test_.LoadRelaxed() 13703e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " marked " << large_object_mark_.LoadRelaxed(); 137102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 1372d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountJavaLangRefs) { 13733e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "References scanned " << reference_count_.LoadRelaxed(); 137402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 13750e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 13763e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers VLOG(gc) << "Marked: null=" << mark_null_count_.LoadRelaxed() 13773e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " immune=" << mark_immune_count_.LoadRelaxed() 13783e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " fastpath=" << mark_fastpath_count_.LoadRelaxed() 13793e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers << " slowpath=" << mark_slowpath_count_.LoadRelaxed(); 13800e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 13814aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier CHECK(mark_stack_->IsEmpty()); // Ensure that the mark stack is empty. 13825301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier mark_stack_->Reset(); 13834aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 13844aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->ClearMarkedObjects(); 138569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 138669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 1387c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchivoid MarkSweep::RevokeAllThreadLocalBuffers() { 1388c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi if (kRevokeRosAllocThreadLocalBuffersAtCheckpoint && IsConcurrent()) { 1389c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // If concurrent, rosalloc thread-local buffers are revoked at the 1390c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // thread checkpoint. Bump pointer space thread-local buffers must 1391c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // not be in use. 1392c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->AssertAllBumpPointerSpaceThreadLocalBuffersAreRevoked(); 1393c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } else { 1394f5997b4d3f889569d5a2b724d83d764bfbb8d106Mathieu Chartier TimingLogger::ScopedTiming t(__FUNCTION__, GetTimings()); 1395c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->RevokeAllThreadLocalBuffers(); 1396c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1397c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi} 1398c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 13991d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace collector 14001d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace gc 140169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} // namespace art 1402