mark_sweep.cc revision a8e8f9c0a8e259a807d7b99a148d14104c24209d
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 192b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier#include <functional> 202b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier#include <numeric> 2158551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro#include <climits> 2258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro#include <vector> 2358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 2494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier#include "base/bounded_fifo.h" 2507ed66b5ae659c452cbe1ab20c3dbf1d6f546461Elliott Hughes#include "base/logging.h" 26761600567d73b23324ae0251e871c15d6849ffd8Elliott Hughes#include "base/macros.h" 27693ff61274cd2c9b8eb7e68c370f84a911b8ca52Ian Rogers#include "base/mutex-inl.h" 28a84395489098e4531619b1cffd1afc282b14510eSameer Abu Asal#include "base/timing_logger.h" 291d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/accounting/card_table-inl.h" 304aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier#include "gc/accounting/heap_bitmap-inl.h" 3111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier#include "gc/accounting/mod_union_table.h" 321d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/accounting/space_bitmap-inl.h" 331d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/heap.h" 341d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/image_space.h" 351d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/large_object_space.h" 361d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/space-inl.h" 372dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mark_sweep-inl.h" 38ea46f950e7a51585db293cd7f047de190a482414Brian Carlstrom#include "mirror/art_field-inl.h" 392dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object-inl.h" 401f87008b165d26541d832ff805250afdc89c253dBrian Carlstrom#include "runtime.h" 414aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier#include "scoped_thread_state_change.h" 421d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "thread-inl.h" 436f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier#include "thread_list.h" 4469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 45ea46f950e7a51585db293cd7f047de190a482414Brian Carlstromusing ::art::mirror::ArtField; 463e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::Class; 473e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::Object; 483e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::ObjectArray; 492dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers 5069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapironamespace art { 511d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace gc { 521d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace collector { 5369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 5402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Performance options. 55eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseRecursiveMark = false; 56eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseMarkStackPrefetch = true; 57eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kSweepArrayChunkFreeSize = 1024; 58eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kPreCleanCards = true; 5994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 6094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Parallelism options. 61eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelCardScan = true; 62eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelRecursiveMark = true; 6394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Don't attempt to parallelize mark stack processing unless the mark stack is at least n 6494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// elements. This is temporary until we reduce the overhead caused by allocating tasks, etc.. Not 6594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// having this can add overhead in ProcessReferences since we may end up doing many calls of 6694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// ProcessMarkStack with very small mark stacks. 67eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kMinimumParallelMarkStackSize = 128; 68eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelProcessMarkStack = true; 69858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 7002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Profiling and information flags. 71eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kProfileLargeObjects = false; 72eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kMeasureOverhead = false; 73eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCountTasks = false; 74eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCountJavaLangRefs = false; 750e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierstatic constexpr bool kCountMarkedObjects = false; 7694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 7794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Turn off kCheckLocks when profiling the GC since it slows the GC down by up to 40%. 78eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCheckLocks = kDebugLocking; 797bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartierstatic constexpr bool kVerifyRootsMarked = kIsDebugBuild; 8002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 81c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// If true, revoke the rosalloc thread-local buffers at the 82c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// checkpoint, as opposed to during the pause. 83c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchistatic constexpr bool kRevokeRosAllocThreadLocalBuffersAtCheckpoint = true; 84c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::BindBitmaps() { 864446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("BindBitmaps"); 872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 882b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Mark all of the spaces we never collect as immune. 8994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 901d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyNeverCollect) { 918d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier CHECK(immune_region_.AddContinuousSpace(space)) << "Failed to add space " << *space; 922b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 944446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 952b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 971d54e73444e017d3a65234e0f193846f3e27472bIan RogersMarkSweep::MarkSweep(Heap* heap, bool is_concurrent, const std::string& name_prefix) 981d54e73444e017d3a65234e0f193846f3e27472bIan Rogers : GarbageCollector(heap, 99590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier name_prefix + 1001d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (is_concurrent ? "concurrent mark sweep": "mark sweep")), 10135883cc623fdf475a4ead1dafcba9e9becc1ed11Mathieu Chartier gc_barrier_(new Barrier(0)), 10262d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers large_object_lock_("mark sweep large object lock", kMarkSweepLargeObjectLock), 103958291c7afe723d846a39539fd00410c102485f3Mathieu Chartier mark_stack_lock_("mark sweep mark stack lock", kMarkSweepMarkStackLock), 104590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier is_concurrent_(is_concurrent) { 1055301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier} 106b3bd5f07884f5a1f2b84224363b1372d7c28d447Elliott Hughes 1072b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::InitializePhase() { 1081d54e73444e017d3a65234e0f193846f3e27472bIan Rogers timings_.Reset(); 1095fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("InitializePhase", &timings_); 110e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier mark_stack_ = heap_->mark_stack_.get(); 111e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier DCHECK(mark_stack_ != nullptr); 1128d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier immune_region_.Reset(); 1132b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier class_count_ = 0; 1142b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier array_count_ = 0; 1152b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier other_count_ = 0; 1162b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier large_object_test_ = 0; 1172b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier large_object_mark_ = 0; 1182b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier overhead_time_ = 0; 1192b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier work_chunks_created_ = 0; 1202b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier work_chunks_deleted_ = 0; 1212b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier reference_count_ = 0; 1220e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_null_count_ = 0; 1230e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_immune_count_ = 0; 1240e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_fastpath_count_ = 0; 1250e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_slowpath_count_ = 0; 1260e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier { 1270e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // TODO: I don't think we should need heap bitmap lock to get the mark bitmap. 1280e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 1290e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_bitmap_ = heap_->GetMarkBitmap(); 1300e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 131df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi if (!clear_soft_references_) { 132df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi // Always clear soft references if a non-sticky collection. 133df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi clear_soft_references_ = GetGcType() != collector::kGcTypeSticky; 134df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi } 13594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Do any pre GC verification. 1364654322261c8e4d799acdea60a7e227f33c5c2dbAnwar Ghuloum timings_.NewSplit("PreGcVerification"); 1372b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier heap_->PreGcVerification(this); 1382b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1392b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1402b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ProcessReferences(Thread* self) { 1415fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("ProcessReferences", &timings_); 1428e56c7e41cb37e2eaf553503968a01ff893b135bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 14339e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier GetHeap()->ProcessReferences(timings_, clear_soft_references_, &IsMarkedCallback, 1443bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier &MarkObjectCallback, &ProcessMarkStackPausedCallback, this); 1452b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1462b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 147601276abdb746b03675ff945745aa936694d3439Mathieu Chartiervoid MarkSweep::PreProcessReferences() { 148601276abdb746b03675ff945745aa936694d3439Mathieu Chartier if (IsConcurrent()) { 149601276abdb746b03675ff945745aa936694d3439Mathieu Chartier // No reason to do this for non-concurrent GC since pre processing soft references only helps 150601276abdb746b03675ff945745aa936694d3439Mathieu Chartier // pauses. 151601276abdb746b03675ff945745aa936694d3439Mathieu Chartier timings_.NewSplit("PreProcessReferences"); 152601276abdb746b03675ff945745aa936694d3439Mathieu Chartier GetHeap()->ProcessSoftReferences(timings_, clear_soft_references_, &IsMarkedCallback, 153601276abdb746b03675ff945745aa936694d3439Mathieu Chartier &MarkObjectCallback, &ProcessMarkStackPausedCallback, this); 154601276abdb746b03675ff945745aa936694d3439Mathieu Chartier } 1551ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier} 1561ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier 1570f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::PausePhase() { 1580f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier TimingLogger::ScopedSplit split("(Paused)PausePhase", &timings_); 1592b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 1602b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 1610f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (IsConcurrent()) { 1620f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Handle the dirty objects if we are a concurrent GC. 1632b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1642b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Re-mark root set. 1652b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ReMarkRoots(); 1662b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Scan dirty objects, this is only required if we are not doing concurrent GC. 16794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkDirtyObjects(true, accounting::CardTable::kCardDirty); 1682b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1692b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ProcessReferences(self); 1700f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier { 1710f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier timings_.NewSplit("SwapStacks"); 1722b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1730f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier heap_->SwapStacks(self); 1740f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier live_stack_freeze_size_ = heap_->GetLiveStack()->Size(); 1750f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Need to revoke all the thread local allocation stacks since we just swapped the allocation 1760f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // stacks and don't want anybody to allocate into the live stack. 177c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 1782b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1790f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier timings_.StartSplit("PreSweepingGcVerification"); 1800f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier heap_->PreSweepingGcVerification(this); 1810f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier timings_.EndSplit(); 1820f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (IsConcurrent()) { 1830f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Disallow new system weaks to prevent a race which occurs when someone adds a new system 1840f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // weak before we sweep them. Since this new system weak may not be marked, the GC may 1850f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // incorrectly sweep it. This also fixes a race where interning may attempt to return a strong 1860f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // reference to a string that is about to be swept. 1870f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier Runtime::Current()->DisallowNewSystemWeaks(); 1880f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier } 1892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 191dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartiervoid MarkSweep::PreCleanCards() { 192dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Don't do this for non concurrent GCs since they don't have any dirty cards. 193dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier if (kPreCleanCards && IsConcurrent()) { 194dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier Thread* self = Thread::Current(); 195dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier CHECK(!Locks::mutator_lock_->IsExclusiveHeld(self)); 196dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process dirty cards and add dirty cards to mod union tables, also ages cards. 19738e68e9978236db87c9008bbe47db80525d2fa16Hiroshi Yamauchi heap_->ProcessCards(timings_, false); 198eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The checkpoint root marking is required to avoid a race condition which occurs if the 199eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // following happens during a reference write: 200eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 1. mutator dirties the card (write barrier) 201eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 2. GC ages the card (the above ProcessCards call) 202eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 3. GC scans the object (the RecursiveMarkDirtyObjects call below) 203eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 4. mutator writes the value (corresponding to the write barrier in 1.) 204eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // This causes the GC to age the card but not necessarily mark the reference which the mutator 205eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // wrote into the object stored in the card. 206eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // Having the checkpoint fixes this issue since it ensures that the card mark and the 207eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // reference write are visible to the GC before the card is scanned (this is due to locks being 208eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // acquired / released in the checkpoint code). 209eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The other roots are also marked to help reduce the pause. 2100f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, false); 211dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier MarkNonThreadRoots(); 212893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 213893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagClearRootLog | kVisitRootFlagNewRoots)); 214dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process the newly aged cards. 215dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier RecursiveMarkDirtyObjects(false, accounting::CardTable::kCardDirty - 1); 216dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // TODO: Empty allocation stack to reduce the number of objects we need to test / mark as live 217dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // in the next GC. 218dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier } 219dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier} 220dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier 221c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartiervoid MarkSweep::RevokeAllThreadLocalAllocationStacks(Thread* self) { 222c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier if (kUseThreadLocalAllocationStack) { 2230f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier timings_.NewSplit("RevokeAllThreadLocalAllocationStacks"); 224c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 225c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier heap_->RevokeAllThreadLocalAllocationStacks(self); 226c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier } 227c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier} 228c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier 2292b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkingPhase() { 2305fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("MarkingPhase", &timings_); 2312b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 2322b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2332b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier BindBitmaps(); 2340e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier FindDefaultSpaceBitmap(); 2354446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum 2362b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Process dirty cards and add dirty cards to mod union tables. 23738e68e9978236db87c9008bbe47db80525d2fa16Hiroshi Yamauchi heap_->ProcessCards(timings_, false); 2382b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2392b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 240893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkRoots(self); 2412b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkReachableObjects(); 242dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Pre-clean dirtied cards to reduce pauses. 243dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier PreCleanCards(); 244601276abdb746b03675ff945745aa936694d3439Mathieu Chartier PreProcessReferences(); 2452b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2462b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 24711409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartiervoid MarkSweep::UpdateAndMarkModUnion() { 24811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier for (const auto& space : heap_->GetContinuousSpaces()) { 2498d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsSpace(space)) { 25011409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier const char* name = space->IsZygoteSpace() ? "UpdateAndMarkZygoteModUnionTable" : 25111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier "UpdateAndMarkImageModUnionTable"; 2525fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split(name, &timings_); 25311409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier accounting::ModUnionTable* mod_union_table = heap_->FindModUnionTableFromSpace(space); 25411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier CHECK(mod_union_table != nullptr); 255407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mod_union_table->UpdateAndMarkReferences(MarkHeapReferenceCallback, this); 25611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 25711409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 25811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier} 25911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier 2602b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkReachableObjects() { 2614aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier UpdateAndMarkModUnion(); 2622b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Recursively mark all the non-image bits set in the mark bitmap. 2632b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier RecursiveMark(); 2642b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2652b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2662b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ReclaimPhase() { 2675fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("ReclaimPhase", &timings_); 268720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 2690f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier SweepSystemWeaks(self); 270c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier if (IsConcurrent()) { 271c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier Runtime::Current()->AllowNewSystemWeaks(); 2722b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 2732b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier { 2742b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 2752b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2762b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Reclaim unmarked objects. 2771d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Sweep(false); 2782b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2792b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Swap the live and mark bitmaps for each space which we modified space. This is an 2802b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // optimization that enables us to not clear live bits inside of the sweep. Only swaps unbound 2812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // bitmaps. 2824446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("SwapBitmaps"); 2832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SwapBitmaps(); 2844446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 2852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2862b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Unbind the live and mark bitmaps. 287a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier TimingLogger::ScopedSplit split("UnBindBitmaps", &timings_); 288a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier GetHeap()->UnBindBitmaps(); 2892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 2902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2920e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartiervoid MarkSweep::FindDefaultSpaceBitmap() { 2935fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("FindDefaultMarkBitmap", &timings_); 29402e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 295a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap = space->GetMarkBitmap(); 296590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (bitmap != nullptr && 297590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) { 2980e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = bitmap; 2997469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier return; 300b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 301b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 3027469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier GetHeap()->DumpSpaces(); 3037469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier LOG(FATAL) << "Could not find a default mark bitmap"; 30458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 30558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 306ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartiervoid MarkSweep::ExpandMarkStack() { 307ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier ResizeMarkStack(mark_stack_->Capacity() * 2); 308ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier} 309ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier 310ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartiervoid MarkSweep::ResizeMarkStack(size_t new_size) { 311ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Rare case, no need to have Thread::Current be a parameter. 312ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (UNLIKELY(mark_stack_->Size() < mark_stack_->Capacity())) { 313ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Someone else acquired the lock and expanded the mark stack before us. 314ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier return; 315ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 31602e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier std::vector<Object*> temp(mark_stack_->Begin(), mark_stack_->End()); 317ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier CHECK_LE(mark_stack_->Size(), new_size); 318ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier mark_stack_->Resize(new_size); 31902e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& obj : temp) { 32002e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier mark_stack_->PushBack(obj); 321ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 322ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 323ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 3240e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::MarkObjectNonNullParallel(Object* obj) { 325ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier DCHECK(obj != NULL); 326ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (MarkObjectParallel(obj)) { 327ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 328ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 329184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier ExpandMarkStack(); 330ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 331ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier // The object must be pushed on to the mark stack. 3320e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 333ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 334ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 335ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 3363bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartiermirror::Object* MarkSweep::MarkObjectCallback(mirror::Object* obj, void* arg) { 33739e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier MarkSweep* mark_sweep = reinterpret_cast<MarkSweep*>(arg); 33839e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier mark_sweep->MarkObject(obj); 33939e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier return obj; 34039e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier} 34139e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier 342407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::MarkHeapReferenceCallback(mirror::HeapReference<mirror::Object>* ref, void* arg) { 343407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObject(ref->AsMirrorPtr()); 344407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier} 345407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 3460e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::MarkObjectNonNull(Object* obj) { 3470e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 348624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 349624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 350624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 3519d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 3528d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 3530e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 3540e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_immune_count_; 3550e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 356e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier DCHECK(IsMarked(obj)); 357357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier return; 358357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 359b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 360b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier // the hard way. 361a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* object_bitmap = current_space_bitmap_; 36202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (UNLIKELY(!object_bitmap->HasAddress(obj))) { 3630e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier object_bitmap = mark_bitmap_->GetContinuousSpaceBitmap(obj); 3640e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 3650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_slowpath_count_; 3660e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 3670e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (UNLIKELY(object_bitmap == nullptr)) { 3689642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier MarkLargeObject(obj, true); 369e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier return; 370357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 3710e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } else if (kCountMarkedObjects) { 3720e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_fastpath_count_; 373b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 37469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro // This object was not previously marked. 3750e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (!object_bitmap->Set(obj)) { 3760e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier PushOnMarkStack(obj); 3770e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 3780e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier} 3790e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier 3800e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::PushOnMarkStack(Object* obj) { 3810e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 3820e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // Lock is not needed but is here anyways to please annotalysis. 3830e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 3840e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ExpandMarkStack(); 38569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 3860e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // The object must be pushed on to the mark stack. 3870e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 38869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 38969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 39002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Rare case, probably not worth inlining since it will increase instruction cache miss rate. 3919642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartierbool MarkSweep::MarkLargeObject(const Object* obj, bool set) { 3921d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // TODO: support >1 discontinuous space. 3931d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 394db7f37d57b6ac83abe6815d0cd5c50701b6be821Mathieu Chartier accounting::ObjectSet* large_objects = large_object_space->GetMarkObjects(); 39502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 39602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ++large_object_test_; 39702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 39802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (UNLIKELY(!large_objects->Test(obj))) { 3994fcb8d335cc856380531a42c8c708cc789a77395Mathieu Chartier if (!large_object_space->Contains(obj)) { 40002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier LOG(ERROR) << "Tried to mark " << obj << " not contained by any spaces"; 40102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier LOG(ERROR) << "Attempting see if it's a bad root"; 40202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier VerifyRoots(); 40302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier LOG(FATAL) << "Can't mark bad root"; 40402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 40502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 40602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ++large_object_mark_; 40702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 4089642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier if (set) { 4099642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier large_objects->Set(obj); 4109642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } else { 4119642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier large_objects->Clear(obj); 4129642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } 41302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return true; 41402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 41502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 41602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 41702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 41802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierinline bool MarkSweep::MarkObjectParallel(const Object* obj) { 4190e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 420624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 421624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 422624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 4239d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 4248d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 42502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier DCHECK(IsMarked(obj)); 42602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 42702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 42802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 42902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // the hard way. 430a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* object_bitmap = current_space_bitmap_; 43102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (UNLIKELY(!object_bitmap->HasAddress(obj))) { 432a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* new_bitmap = mark_bitmap_->GetContinuousSpaceBitmap(obj); 43302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (new_bitmap != NULL) { 43402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier object_bitmap = new_bitmap; 43502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } else { 43602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // TODO: Remove the Thread::Current here? 43702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // TODO: Convert this to some kind of atomic marking? 43802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MutexLock mu(Thread::Current(), large_object_lock_); 4399642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier return MarkLargeObject(obj, true); 44002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 44102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 44202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Return true if the object was not previously marked. 44302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return !object_bitmap->AtomicTestAndSet(obj); 44402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 44502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 4460e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier// Used to mark objects when processing the mark stack. If an object is null, it is not marked. 4470e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::MarkObject(Object* obj) { 4480e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (obj != nullptr) { 4499642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier MarkObjectNonNull(obj); 4500e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } else if (kCountMarkedObjects) { 4510e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_null_count_; 45269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 45369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 45469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 4550e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartiervoid MarkSweep::MarkRootParallelCallback(Object** root, void* arg, uint32_t /*thread_id*/, 456815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier RootType /*root_type*/) { 457815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObjectNonNullParallel(*root); 458ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 459ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 460893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::VerifyRootMarked(Object** root, void* arg, uint32_t /*thread_id*/, 461893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier RootType /*root_type*/) { 462893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier CHECK(reinterpret_cast<MarkSweep*>(arg)->IsMarked(*root)); 463893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier} 464893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier 465815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartiervoid MarkSweep::MarkRootCallback(Object** root, void* arg, uint32_t /*thread_id*/, 466815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier RootType /*root_type*/) { 467815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObjectNonNull(*root); 468815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier} 469815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier 4706f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRootCallback(const Object* root, void* arg, size_t vreg, 4717bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier const StackVisitor* visitor, RootType root_type) { 4727bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->VerifyRoot(root, vreg, visitor, root_type); 4736f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 4746f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 4757bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartiervoid MarkSweep::VerifyRoot(const Object* root, size_t vreg, const StackVisitor* visitor, 4767bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier RootType root_type) { 4776f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier // See if the root is on any space bitmap. 478a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier if (heap_->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == nullptr) { 4791d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 4804202b7484dab71ca4dfc2109ebb3fd04b87badfbMathieu Chartier if (!large_object_space->Contains(root)) { 4817bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier LOG(ERROR) << "Found invalid root: " << root << " with type " << root_type; 48240e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogers if (visitor != NULL) { 48340e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogers LOG(ERROR) << visitor->DescribeLocation() << " in VReg: " << vreg; 4846f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 4856f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 4866f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 4876f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 4886f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 4896f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRoots() { 4906f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier Runtime::Current()->GetThreadList()->VerifyRoots(VerifyRootCallback, this); 4916f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 4926f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 493893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkRoots(Thread* self) { 494893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 495893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // If we exclusively hold the mutator lock, all threads must be suspended. 496893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier timings_.StartSplit("MarkRoots"); 497893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Runtime::Current()->VisitRoots(MarkRootCallback, this); 498893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier timings_.EndSplit(); 499893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 500893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } else { 5010f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, kRevokeRosAllocThreadLocalBuffersAtCheckpoint); 502893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // At this point the live stack should no longer have any mutators which push into it. 503893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkNonThreadRoots(); 504893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 505893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagAllRoots | kVisitRootFlagStartLoggingNewRoots)); 506893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 5079ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier} 5089ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier 509858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartiervoid MarkSweep::MarkNonThreadRoots() { 5104446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkNonThreadRoots"); 511423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier Runtime::Current()->VisitNonThreadRoots(MarkRootCallback, this); 5124446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 513858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 514858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 515893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkConcurrentRoots(VisitRootFlags flags) { 5164446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkConcurrentRoots"); 5171d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Visit all runtime roots and clear dirty flags. 518893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Runtime::Current()->VisitConcurrentRoots(MarkRootCallback, this, flags); 5194446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 52069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 52169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 52202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass ScanObjectVisitor { 523cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier public: 52494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE 52594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep) {} 526cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 527407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj) const ALWAYS_INLINE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 528407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 52994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 5302b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 5312b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 5322b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 53302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_sweep_->ScanObject(obj); 534cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 535cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 536cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier private: 537cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier MarkSweep* const mark_sweep_; 538cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 539cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 540407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartierclass DelayReferenceReferentVisitor { 541407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 542407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit DelayReferenceReferentVisitor(MarkSweep* collector) : collector_(collector) { 543407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 544407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 545407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(mirror::Class* klass, mirror::Reference* ref) const 546407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 547407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 548407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier collector_->DelayReferenceReferent(klass, ref); 549407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 550407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 551407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 552407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const collector_; 553407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier}; 554407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 55594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiertemplate <bool kUseFinger = false> 55694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass MarkStackTask : public Task { 55794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 55894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, size_t mark_stack_size, 5590e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object** mark_stack) 56094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep), 56194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_(thread_pool), 56294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_(mark_stack_size) { 56394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We may have to copy part of an existing mark stack when another mark stack overflows. 56494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_size != 0) { 56594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(mark_stack != NULL); 56694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Check performance? 56794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier std::copy(mark_stack, mark_stack + mark_stack_size, mark_stack_); 56894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 56994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 57094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_created_; 5711d54e73444e017d3a65234e0f193846f3e27472bIan Rogers } 572262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier } 573262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 57494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kMaxSize = 1 * KB; 575cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 57694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 577407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier class MarkObjectParallelVisitor { 578407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 579407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit MarkObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task, 580407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* mark_sweep) ALWAYS_INLINE 581407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier : chunk_task_(chunk_task), mark_sweep_(mark_sweep) {} 582407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 583407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj, MemberOffset offset, bool /* static */) const ALWAYS_INLINE 584407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 585407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mirror::Object* ref = obj->GetFieldObject<mirror::Object>(offset, false); 586407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (ref != nullptr && mark_sweep_->MarkObjectParallel(ref)) { 587407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (kUseFinger) { 588407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier android_memory_barrier(); 589407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (reinterpret_cast<uintptr_t>(ref) >= 590407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier static_cast<uintptr_t>(mark_sweep_->atomic_finger_)) { 591407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier return; 592407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 593407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 594407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier chunk_task_->MarkStackPush(ref); 595407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 596407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 597407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 598407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 599407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 600407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep_; 601407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier }; 602407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 60394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier class ScanObjectParallelVisitor { 60494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 60594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task) ALWAYS_INLINE 60694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : chunk_task_(chunk_task) {} 60794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 608407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier // No thread safety analysis since multiple threads will use this visitor. 609407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj) const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 610407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 611407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep = chunk_task_->mark_sweep_; 612407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectParallelVisitor mark_visitor(chunk_task_, mark_sweep); 613407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(mark_sweep); 614407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mark_sweep->ScanObjectVisit(obj, mark_visitor, ref_visitor); 61594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 61694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 61794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier private: 61894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 61994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier }; 62094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 62194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual ~MarkStackTask() { 62294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Make sure that we have cleared our mark stack. 62394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_EQ(mark_stack_pos_, 0U); 62494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 62594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_deleted_; 6262b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 627cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 628cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 62994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkSweep* const mark_sweep_; 63094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* const thread_pool_; 63194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Thread local mark stack for this task. 6320e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object* mark_stack_[kMaxSize]; 63394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack position. 63494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_pos_; 63594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 6360e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier void MarkStackPush(Object* obj) ALWAYS_INLINE { 63794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == kMaxSize)) { 63894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack overflow, give 1/2 the stack to the thread pool as a new work task. 63994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_ /= 2; 64094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new MarkStackTask(thread_pool_, mark_sweep_, kMaxSize - mark_stack_pos_, 64194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_ + mark_stack_pos_); 64294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_->AddTask(Thread::Current(), task); 64394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 64494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != nullptr); 6450e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_LT(mark_stack_pos_, kMaxSize); 64694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_[mark_stack_pos_++] = obj; 64794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 64894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 64994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 65094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 65194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 65294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 65394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 654407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier virtual void Run(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 655407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 65694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 65794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 65894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 6590e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier BoundedFifoPowerOfTwo<Object*, kFifoSize> prefetch_fifo; 66094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (;;) { 6610e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object* obj = nullptr; 66294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 66394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (mark_stack_pos_ != 0 && prefetch_fifo.size() < kFifoSize) { 6640e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object* obj = mark_stack_[--mark_stack_pos_]; 66511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 66694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier __builtin_prefetch(obj); 66794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.push_back(obj); 66894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 66994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(prefetch_fifo.empty())) { 67094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 67194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 67294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 67394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 67494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 67594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == 0)) { 67694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 67794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 67894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_[--mark_stack_pos_]; 67994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 68011409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 6810e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier visitor(obj); 68294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 68394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 68494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 68594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 68694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass CardScanTask : public MarkStackTask<false> { 68794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 688a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier CardScanTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 689a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, 69094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* begin, byte* end, byte minimum_age, size_t mark_stack_size, 6910e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object** mark_stack_obj) 69294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, mark_stack_size, mark_stack_obj), 69394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 69494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 69594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end), 69694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier minimum_age_(minimum_age) { 69794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 69894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 69994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 700a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 70194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* const begin_; 70294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* const end_; 70394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const byte minimum_age_; 70494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 70594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 70694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 70794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 70894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 70994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 71094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 71194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = mark_sweep_->GetHeap()->GetCardTable(); 7120f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier size_t cards_scanned = card_table->Scan(bitmap_, begin_, end_, visitor, minimum_age_); 7130f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier VLOG(heap) << "Parallel scanning cards " << reinterpret_cast<void*>(begin_) << " - " 7140f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier << reinterpret_cast<void*>(end_) << " = " << cards_scanned; 71594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 71694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 71794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 718cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 719cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 7202775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiersize_t MarkSweep::GetThreadCount(bool paused) const { 7212775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (heap_->GetThreadPool() == nullptr || !heap_->CareAboutPauseTimes()) { 7222775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier return 0; 7232775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 7242775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (paused) { 7252775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier return heap_->GetParallelGCThreadCount() + 1; 7262775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } else { 7272775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier return heap_->GetConcGCThreadCount() + 1; 7282775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 7292775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier} 7302775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier 73194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ScanGrayObjects(bool paused, byte minimum_age) { 73294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = GetHeap()->GetCardTable(); 73394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 7342775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 7352775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier // The parallel version with only one thread is faster for card scanning, TODO: fix. 7362775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelCardScan && thread_count > 0) { 737720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 73894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Can't have a different split for each space since multiple spaces can have their cards being 73994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // scanned at the same time. 74094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayObjects" : "ScanGrayObjects"); 74194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Try to take some of the mark stack since we can pass this off to the worker tasks. 7420e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object** mark_stack_begin = mark_stack_->Begin(); 7430e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object** mark_stack_end = mark_stack_->End(); 744720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier const size_t mark_stack_size = mark_stack_end - mark_stack_begin; 74594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Estimated number of work tasks we will create. 74694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_tasks = GetHeap()->GetContinuousSpaces().size() * thread_count; 74794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_NE(mark_stack_tasks, 0U); 74894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_delta = std::min(CardScanTask::kMaxSize / 2, 74994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_size / mark_stack_tasks + 1); 75094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 751590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() == nullptr) { 752590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 753590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 75494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* card_begin = space->Begin(); 75594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* card_end = space->End(); 7560941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Align up the end address. For example, the image space's end 7570941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // may not be card-size-aligned. 7580941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi card_end = AlignUp(card_end, accounting::CardTable::kCardSize); 7590941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi DCHECK(IsAligned<accounting::CardTable::kCardSize>(card_begin)); 7600941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi DCHECK(IsAligned<accounting::CardTable::kCardSize>(card_end)); 76194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how many bytes of heap we will scan, 76294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t address_range = card_end - card_begin; 76394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how much address range each task gets. 76494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t card_delta = RoundUp(address_range / thread_count + 1, 76594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable::kCardSize); 76694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create the worker tasks for this space. 76794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (card_begin != card_end) { 76894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add a range of cards. 76994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t addr_remaining = card_end - card_begin; 77094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t card_increment = std::min(card_delta, addr_remaining); 77194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Take from the back of the mark stack. 77294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_remaining = mark_stack_end - mark_stack_begin; 77394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining); 77494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_end -= mark_stack_increment; 77594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment)); 7760e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_EQ(mark_stack_end, mark_stack_->End()); 77794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add the new task to the thread pool. 77894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new CardScanTask(thread_pool, this, space->GetMarkBitmap(), card_begin, 77994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin + card_increment, minimum_age, 78094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_increment, mark_stack_end); 78194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 78294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin += card_increment; 78394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 78494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 7850f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 7860941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Note: the card scan below may dirty new cards (and scan them) 7870941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // as a side effect when a Reference object is encountered and 7880941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // queued during the marking. See b/11465268. 7892775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 79094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 7912775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 79294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 79394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.EndSplit(); 79494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 79594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 796590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() != nullptr) { 797590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Image spaces are handled properly since live == marked for them. 798590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier switch (space->GetGcRetentionPolicy()) { 799590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyNeverCollect: 800590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayImageSpaceObjects" : 801590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayImageSpaceObjects"); 802590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 803590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyFullCollect: 804590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayZygoteSpaceObjects" : 805590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayZygoteSpaceObjects"); 806590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 807590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyAlwaysCollect: 808590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayAllocSpaceObjects" : 809590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayAllocSpaceObjects"); 810590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 811590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 812590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier ScanObjectVisitor visitor(this); 813590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier card_table->Scan(space->GetMarkBitmap(), space->Begin(), space->End(), visitor, minimum_age); 814590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.EndSplit(); 815590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 81694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 81794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 81894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier} 81994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 82094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass RecursiveMarkTask : public MarkStackTask<false> { 82194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 82294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 823a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, uintptr_t begin, uintptr_t end) 82494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, 0, NULL), 82594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 82694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 82794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end) { 82894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 82994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 83094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 831a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 83294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t begin_; 83394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t end_; 83494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 83594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 83694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 83794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 83894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 83994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 84094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 84194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 84294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_->VisitMarkedRange(begin_, end_, visitor); 84394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 84494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 84594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 84694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 84794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 84858551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// Populates the mark stack based on the set of marked objects and 84958551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// recursively marks until the mark stack is emptied. 8502b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::RecursiveMark() { 8515fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("RecursiveMark", &timings_); 852a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // RecursiveMark will build the lists of known instances of the Reference classes. See 853a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // DelayReferenceReferent for details. 85494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseRecursiveMark) { 85594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const bool partial = GetGcType() == kGcTypePartial; 85694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectVisitor scan_visitor(this); 85794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* self = Thread::Current(); 85894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = heap_->GetThreadPool(); 8592775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(false); 8602775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const bool parallel = kParallelRecursiveMark && thread_count > 1; 86194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->Reset(); 86202e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 8631d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if ((space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) || 8641d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (!partial && space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) { 8650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = space->GetMarkBitmap(); 8660e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_ == nullptr) { 867590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 8682b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 86994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (parallel) { 87094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We will use the mark stack the future. 87194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // CHECK(mark_stack_->IsEmpty()); 87294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 87394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 87494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 87594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier atomic_finger_ = static_cast<int32_t>(0xFFFFFFFF); 87694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 87794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create a few worker tasks. 8782775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t n = thread_count * 2; 87994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (begin != end) { 88094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t start = begin; 88194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t delta = (end - begin) / n; 88294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delta = RoundUp(delta, KB); 88394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (delta < 16 * KB) delta = end - begin; 88494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin += delta; 8850e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier auto* task = new RecursiveMarkTask(thread_pool, this, current_space_bitmap_, start, 88694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin); 88794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 88894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 8892775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 89094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 8912775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 89294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 89394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 89494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 89594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 89694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 8970e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_->VisitMarkedRange(begin, end, scan_visitor); 89894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 899357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 900357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 901357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 90294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(false); 90358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 90458551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 90583c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartiermirror::Object* MarkSweep::IsMarkedCallback(mirror::Object* object, void* arg) { 9065712d5d04640925970db9c98938ffaf806b3962cMathieu Chartier if (reinterpret_cast<MarkSweep*>(arg)->IsMarked(object)) { 9076aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return object; 9086aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier } 9096aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return nullptr; 910357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 911357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 91294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::RecursiveMarkDirtyObjects(bool paused, byte minimum_age) { 91394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanGrayObjects(paused, minimum_age); 91494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(paused); 915262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier} 916262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 91758551df3c2646ed507feec9e9eb3768085a76059Carl Shapirovoid MarkSweep::ReMarkRoots() { 918893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(Thread::Current()); 9193bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier timings_.StartSplit("(Paused)ReMarkRoots"); 920893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Runtime::Current()->VisitRoots( 921893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkRootCallback, this, static_cast<VisitRootFlags>(kVisitRootFlagNewRoots | 922893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier kVisitRootFlagStopLoggingNewRoots | 923893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier kVisitRootFlagClearRootLog)); 9244446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 9257bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier if (kVerifyRootsMarked) { 926893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier timings_.StartSplit("(Paused)VerifyRoots"); 927893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Runtime::Current()->VisitRoots(VerifyRootMarked, this); 928893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier timings_.EndSplit(); 929893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 93058551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 93158551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 9320f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::SweepSystemWeaks(Thread* self) { 9330f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 9344446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("SweepSystemWeaks"); 9350f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier Runtime::Current()->SweepSystemWeaks(IsMarkedCallback, this); 9364446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 93769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 93869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 9396aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartiermirror::Object* MarkSweep::VerifySystemWeakIsLiveCallback(Object* obj, void* arg) { 940c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->VerifyIsLive(obj); 941c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier // We don't actually want to sweep the object, so lets return "marked" 9426aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return obj; 943c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 944c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 945c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifyIsLive(const Object* obj) { 9464aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier if (!heap_->GetLiveBitmap()->Test(obj)) { 9474aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier space::LargeObjectSpace* large_object_space = heap_->GetLargeObjectsSpace(); 9487469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier if (!large_object_space->GetLiveObjects()->Test(obj)) { 9494aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier if (std::find(heap_->allocation_stack_->Begin(), heap_->allocation_stack_->End(), obj) == 9504aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->allocation_stack_->End()) { 9517469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier // Object not found! 9524aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->DumpSpaces(); 9537469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier LOG(FATAL) << "Found dead object " << obj; 9547469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 955c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 956c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 957c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 958c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 959c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifySystemWeaks() { 9606aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier // Verify system weaks, uses a special object visitor which returns the input object. 9616aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier Runtime::Current()->SweepSystemWeaks(VerifySystemWeakIsLiveCallback, this); 962c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 963c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 9640e4627e593bc39f8e3d89c31f8977d55054c07ccMathieu Chartierclass CheckpointMarkThreadRoots : public Closure { 965858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier public: 9660f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier explicit CheckpointMarkThreadRoots(MarkSweep* mark_sweep, 9670f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) 9680f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier : mark_sweep_(mark_sweep), 9690f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint_( 9700f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 9710f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier } 972858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 9734aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier virtual void Run(Thread* thread) OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 9743f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_BEGIN("Marking thread roots"); 975858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier // Note: self is not necessarily equal to thread since thread may be suspended. 976858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier Thread* self = Thread::Current(); 977d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier CHECK(thread == self || thread->IsSuspended() || thread->GetState() == kWaitingPerformingGc) 978d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << thread->GetState() << " thread " << thread << " self " << self; 979ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier thread->VisitRoots(MarkSweep::MarkRootParallelCallback, mark_sweep_); 9803f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_END(); 9810f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (revoke_ros_alloc_thread_local_buffers_at_checkpoint_) { 9820f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_BEGIN("RevokeRosAllocThreadLocalBuffers"); 983c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi mark_sweep_->GetHeap()->RevokeRosAllocThreadLocalBuffers(thread); 9840f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_END(); 985c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 986858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier mark_sweep_->GetBarrier().Pass(self); 987858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier } 988858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 989858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier private: 9904aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier MarkSweep* const mark_sweep_; 9910f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier const bool revoke_ros_alloc_thread_local_buffers_at_checkpoint_; 992858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier}; 993858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 9940f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::MarkRootsCheckpoint(Thread* self, 9950f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 9960f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CheckpointMarkThreadRoots check_point(this, revoke_ros_alloc_thread_local_buffers_at_checkpoint); 9974446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkRootsCheckpoint"); 998858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 9991d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Request the check point is run on all threads returning a count of the threads that must 10001d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // run through the barrier including self. 10011d54e73444e017d3a65234e0f193846f3e27472bIan Rogers size_t barrier_count = thread_list->RunCheckpoint(&check_point); 10021d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Release locks then wait for all mutator threads to pass the barrier. 10031d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // TODO: optimize to not release locks when there are no threads to wait for. 10041d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 10051d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedUnlock(self); 10064aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier { 10074aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier ScopedThreadStateChange tsc(self, kWaitingForCheckPointsToRun); 10084aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier gc_barrier_->Increment(self, barrier_count); 10094aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier } 10101d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedLock(self); 10111d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveLock(self); 10124446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1013858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 1014858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 10151d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::SweepArray(accounting::ObjectStack* allocations, bool swap_bitmaps) { 101694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.StartSplit("SweepArray"); 1017e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Thread* self = Thread::Current(); 1018e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier mirror::Object* chunk_free_buffer[kSweepArrayChunkFreeSize]; 1019e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t chunk_free_pos = 0; 1020e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_bytes = 0; 1021e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_large_object_bytes = 0; 1022e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_objects = 0; 1023e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_large_objects = 0; 1024e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // How many objects are left in the array, modified after each space is swept. 10250f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier Object** objects = allocations->Begin(); 1026e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t count = allocations->Size(); 1027e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Change the order to ensure that the non-moving space last swept as an optimization. 1028e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::vector<space::ContinuousSpace*> sweep_spaces; 1029e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::ContinuousSpace* non_moving_space = nullptr; 1030e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : heap_->GetContinuousSpaces()) { 10318d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (space->IsAllocSpace() && !immune_region_.ContainsSpace(space) && 10328d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier space->GetLiveBitmap() != nullptr) { 1033e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space == heap_->GetNonMovingSpace()) { 1034e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier non_moving_space = space; 1035e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1036e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(space); 1037e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1038e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1039e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1040e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Unlikely to sweep a significant amount of non_movable objects, so we do these after the after 1041e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the other alloc spaces as an optimization. 1042e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (non_moving_space != nullptr) { 1043e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(non_moving_space); 1044e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1045e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Start by sweeping the continuous spaces. 1046e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : sweep_spaces) { 1047e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::AllocSpace* alloc_space = space->AsAllocSpace(); 1048a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* live_bitmap = space->GetLiveBitmap(); 1049a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); 1050e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (swap_bitmaps) { 1051e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::swap(live_bitmap, mark_bitmap); 1052e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1053e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Object** out = objects; 1054e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (size_t i = 0; i < count; ++i) { 1055e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Object* obj = objects[i]; 1056f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1057f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1058f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1059e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space->HasAddress(obj)) { 1060e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // This object is in the space, remove it from the array and add it to the sweep buffer 1061e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // if needed. 1062e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!mark_bitmap->Test(obj)) { 1063e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos >= kSweepArrayChunkFreeSize) { 1064e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.StartSplit("FreeList"); 1065e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_objects += chunk_free_pos; 1066e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1067e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.EndSplit(); 1068e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1069e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1070e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_buffer[chunk_free_pos++] = obj; 1071e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1072e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1073e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier *(out++) = obj; 1074e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1075e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1076e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos > 0) { 1077e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.StartSplit("FreeList"); 1078e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_objects += chunk_free_pos; 1079e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1080e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.EndSplit(); 1081e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1082e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1083e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // All of the references which space contained are no longer in the allocation stack, update 1084e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the count. 1085e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier count = out - objects; 1086e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1087e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle the large object space. 10881d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 1089db7f37d57b6ac83abe6815d0cd5c50701b6be821Mathieu Chartier accounting::ObjectSet* large_live_objects = large_object_space->GetLiveObjects(); 1090db7f37d57b6ac83abe6815d0cd5c50701b6be821Mathieu Chartier accounting::ObjectSet* large_mark_objects = large_object_space->GetMarkObjects(); 1091357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier if (swap_bitmaps) { 1092e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier std::swap(large_live_objects, large_mark_objects); 1093357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 109402c8cc6d1312a2b55533f02f6369dc7c94672f90Brian Carlstrom for (size_t i = 0; i < count; ++i) { 1095357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier Object* obj = objects[i]; 1096e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle large objects. 1097f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1098f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1099f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1100e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!large_mark_objects->Test(obj)) { 1101e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier ++freed_large_objects; 1102e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier freed_large_object_bytes += large_object_space->Free(self, obj); 1103357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1104357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 11054446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1106357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 1107b22a451675c29ac3fc82a8761d2a385a170d6d7fHiroshi Yamauchi timings_.StartSplit("RecordFree"); 110840e978b0bb5e0011a69d7d1fb83a3e59f2df4f84Mathieu Chartier VLOG(heap) << "Freed " << freed_objects << "/" << count 1109e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier << " objects with size " << PrettySize(freed_bytes); 1110e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier heap_->RecordFree(freed_objects + freed_large_objects, freed_bytes + freed_large_object_bytes); 1111b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_objects_.FetchAndAdd(freed_objects); 1112b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_large_objects_.FetchAndAdd(freed_large_objects); 1113b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_bytes_.FetchAndAdd(freed_bytes); 1114b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_large_object_bytes_.FetchAndAdd(freed_large_object_bytes); 11154446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 11161d54e73444e017d3a65234e0f193846f3e27472bIan Rogers 11174446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("ResetStack"); 1118357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier allocations->Reset(); 11194446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1120357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 1121357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 11221d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::Sweep(bool swap_bitmaps) { 11230f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Ensure that nobody inserted items in the live stack after we swapped the stacks. 11240f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CHECK_GE(live_stack_freeze_size_, GetHeap()->GetLiveStack()->Size()); 11250f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Mark everything allocated since the last as GC live so that we can sweep concurrently, 11260f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // knowing that new allocations won't be marked as live. 11270f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier timings_.StartSplit("MarkStackAsLive"); 11280f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier accounting::ObjectStack* live_stack = heap_->GetLiveStack(); 11290f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier heap_->MarkAllocStackAsLive(live_stack); 11300f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier live_stack->Reset(); 11310f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier timings_.EndSplit(); 11320f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier 1133b43b7d42b0c497333564e76be953157066c2b995Mathieu Chartier DCHECK(mark_stack_->IsEmpty()); 11345fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit("Sweep", &timings_); 113502e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1136a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier if (space->IsContinuousMemMapAllocSpace()) { 1137a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); 1138ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier TimingLogger::ScopedSplit split( 1139a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier alloc_space->IsZygoteSpace() ? "SweepZygoteSpace" : "SweepMallocSpace", &timings_); 1140ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier size_t freed_objects = 0; 1141ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier size_t freed_bytes = 0; 1142a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier alloc_space->Sweep(swap_bitmaps, &freed_objects, &freed_bytes); 1143ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier heap_->RecordFree(freed_objects, freed_bytes); 1144ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier freed_objects_.FetchAndAdd(freed_objects); 1145ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier freed_bytes_.FetchAndAdd(freed_bytes); 114658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 114758551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 11482b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SweepLargeObjects(swap_bitmaps); 114958551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 115058551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 1151e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartiervoid MarkSweep::SweepLargeObjects(bool swap_bitmaps) { 11525fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit("SweepLargeObjects", &timings_); 1153e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier size_t freed_objects = 0; 11542fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier size_t freed_bytes = 0; 1155db7f37d57b6ac83abe6815d0cd5c50701b6be821Mathieu Chartier GetHeap()->GetLargeObjectsSpace()->Sweep(swap_bitmaps, &freed_objects, &freed_bytes); 1156b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_large_objects_.FetchAndAdd(freed_objects); 1157b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_large_object_bytes_.FetchAndAdd(freed_bytes); 11582fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier GetHeap()->RecordFree(freed_objects, freed_bytes); 1159e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier} 1160e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier 1161407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// Process the "referent" field in a java.lang.ref.Reference. If the referent has not yet been 1162407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// marked, put it on the appropriate list in the heap for later processing. 1163407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::DelayReferenceReferent(mirror::Class* klass, mirror::Reference* ref) { 116494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(klass != nullptr); 11650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountJavaLangRefs) { 11660e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++reference_count_; 11670e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 1168407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier heap_->DelayReferenceReferent(klass, ref, IsMarkedCallback, this); 116969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 117069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 117102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass MarkObjectVisitor { 117202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier public: 1173407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit MarkObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE : mark_sweep_(mark_sweep) { 1174407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 117502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 1176407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj, MemberOffset offset, bool /* is_static */) const 1177407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ALWAYS_INLINE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1178407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 117994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 11802b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 11812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 11822b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1183407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mark_sweep_->MarkObject(obj->GetFieldObject<mirror::Object>(offset, false)); 118402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 118502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 118602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier private: 118702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MarkSweep* const mark_sweep_; 118802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier}; 118902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 119069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Scans an object reference. Determines the type of the reference 119169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// and dispatches to a specialized scanning routine. 1192590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartiervoid MarkSweep::ScanObject(Object* obj) { 1193407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectVisitor mark_visitor(this); 1194407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(this); 1195407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ScanObjectVisit(obj, mark_visitor, ref_visitor); 119602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 119702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 11983bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartiervoid MarkSweep::ProcessMarkStackPausedCallback(void* arg) { 11993bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->ProcessMarkStack(true); 12003bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier} 12013bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier 12022775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiervoid MarkSweep::ProcessMarkStackParallel(size_t thread_count) { 120302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier Thread* self = Thread::Current(); 120402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 12052775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t chunk_size = std::min(mark_stack_->Size() / thread_count + 1, 12062775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier static_cast<size_t>(MarkStackTask<false>::kMaxSize)); 120794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier CHECK_GT(chunk_size, 0U); 120894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Split the current mark stack up into work tasks. 120994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (mirror::Object **it = mark_stack_->Begin(), **end = mark_stack_->End(); it < end; ) { 121094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t delta = std::min(static_cast<size_t>(end - it), chunk_size); 12110e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier thread_pool->AddTask(self, new MarkStackTask<false>(thread_pool, this, delta, it)); 121294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier it += delta; 121302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 12142775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 121502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier thread_pool->StartWorkers(self); 12162775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 121794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 121802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_stack_->Reset(); 121902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier CHECK_EQ(work_chunks_created_, work_chunks_deleted_) << " some of the work chunks were leaked"; 122069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 122169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 12225d76c435082332ef79a22962386fa92a0870e378Ian Rogers// Scan anything that's on the mark stack. 122394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ProcessMarkStack(bool paused) { 12243bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier timings_.StartSplit(paused ? "(Paused)ProcessMarkStack" : "ProcessMarkStack"); 12252775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 12262775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelProcessMarkStack && thread_count > 1 && 12272775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier mark_stack_->Size() >= kMinimumParallelMarkStackSize) { 12282775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier ProcessMarkStackParallel(thread_count); 122994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 123094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 123194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 1232590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier BoundedFifoPowerOfTwo<Object*, kFifoSize> prefetch_fifo; 1233d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier for (;;) { 1234590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Object* obj = NULL; 123594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 123694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (!mark_stack_->IsEmpty() && prefetch_fifo.size() < kFifoSize) { 1237590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Object* obj = mark_stack_->PopBack(); 123894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != NULL); 123994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier __builtin_prefetch(obj); 124094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.push_back(obj); 124194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 124294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (prefetch_fifo.empty()) { 124394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 124494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 124594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 124694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 124794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 124894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_->IsEmpty()) { 124994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 125094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 125194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_->PopBack(); 1252d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier } 12534aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier DCHECK(obj != nullptr); 1254d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier ScanObject(obj); 1255357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1256357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 12574446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 125869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 125969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 12607469ebf3888b8037421cb6834f37f946646265ecMathieu Chartierinline bool MarkSweep::IsMarked(const Object* object) const 12617469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 12628d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(object)) { 12637469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier return true; 12647469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 12650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_->HasAddress(object)) { 12660e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier return current_space_bitmap_->Test(object); 12677469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 12680e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier return mark_bitmap_->Test(object); 12697469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier} 12707469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier 12712b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::FinishPhase() { 12725fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("FinishPhase", &timings_); 12734654322261c8e4d799acdea60a7e227f33c5c2dbAnwar Ghuloum // Can't enqueue references if we hold the mutator lock. 12744654322261c8e4d799acdea60a7e227f33c5c2dbAnwar Ghuloum timings_.NewSplit("PostGcVerification"); 12754aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->PostGcVerification(this); 1276d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountScannedTypes) { 1277d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "MarkSweep scanned classes=" << class_count_ << " arrays=" << array_count_ 1278d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << " other=" << other_count_; 127902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 128002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kCountTasks) { 1281d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Total number of work chunks allocated: " << work_chunks_created_; 128202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 128302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kMeasureOverhead) { 1284d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Overhead time " << PrettyDuration(overhead_time_); 128502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 128602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 1287d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Large objects tested " << large_object_test_ << " marked " << large_object_mark_; 128802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 1289d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountJavaLangRefs) { 1290d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "References scanned " << reference_count_; 129102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 12920e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 12930e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier VLOG(gc) << "Marked: null=" << mark_null_count_ << " immune=" << mark_immune_count_ 12940e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier << " fastpath=" << mark_fastpath_count_ << " slowpath=" << mark_slowpath_count_; 12950e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 12964aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier CHECK(mark_stack_->IsEmpty()); // Ensure that the mark stack is empty. 12975301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier mark_stack_->Reset(); 12984aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 12994aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->ClearMarkedObjects(); 130069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 130169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 1302c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchivoid MarkSweep::RevokeAllThreadLocalBuffers() { 1303c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi if (kRevokeRosAllocThreadLocalBuffersAtCheckpoint && IsConcurrent()) { 1304c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // If concurrent, rosalloc thread-local buffers are revoked at the 1305c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // thread checkpoint. Bump pointer space thread-local buffers must 1306c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // not be in use. 1307c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->AssertAllBumpPointerSpaceThreadLocalBuffersAreRevoked(); 1308c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } else { 1309c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi timings_.StartSplit("(Paused)RevokeAllThreadLocalBuffers"); 1310c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->RevokeAllThreadLocalBuffers(); 1311c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi timings_.EndSplit(); 1312c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1313c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi} 1314c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 13151d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace collector 13161d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace gc 131769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} // namespace art 1318