mark_sweep.cc revision a17288e3b9dd6751005fed3386251d2d0949be74
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" 3478f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier#include "gc/reference_processor.h" 351d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/image_space.h" 361d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/large_object_space.h" 371d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/space-inl.h" 382dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mark_sweep-inl.h" 39ea46f950e7a51585db293cd7f047de190a482414Brian Carlstrom#include "mirror/art_field-inl.h" 402dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object-inl.h" 411f87008b165d26541d832ff805250afdc89c253dBrian Carlstrom#include "runtime.h" 424aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier#include "scoped_thread_state_change.h" 431d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "thread-inl.h" 446f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier#include "thread_list.h" 4569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 46ea46f950e7a51585db293cd7f047de190a482414Brian Carlstromusing ::art::mirror::ArtField; 473e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::Class; 483e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::Object; 493e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::ObjectArray; 502dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers 5169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapironamespace art { 521d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace gc { 531d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace collector { 5469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 5502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Performance options. 56eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseRecursiveMark = false; 57eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kUseMarkStackPrefetch = true; 58eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kSweepArrayChunkFreeSize = 1024; 59eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kPreCleanCards = true; 6094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 6194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Parallelism options. 62eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelCardScan = true; 63eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelRecursiveMark = true; 6494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Don't attempt to parallelize mark stack processing unless the mark stack is at least n 6594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// elements. This is temporary until we reduce the overhead caused by allocating tasks, etc.. Not 6694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// having this can add overhead in ProcessReferences since we may end up doing many calls of 6794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// ProcessMarkStack with very small mark stacks. 68eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr size_t kMinimumParallelMarkStackSize = 128; 69eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kParallelProcessMarkStack = true; 70858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 7102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Profiling and information flags. 72eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kProfileLargeObjects = false; 73eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kMeasureOverhead = false; 74eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCountTasks = false; 75eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCountJavaLangRefs = false; 760e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierstatic constexpr bool kCountMarkedObjects = false; 7794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 7894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Turn off kCheckLocks when profiling the GC since it slows the GC down by up to 40%. 79eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartierstatic constexpr bool kCheckLocks = kDebugLocking; 807bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartierstatic constexpr bool kVerifyRootsMarked = kIsDebugBuild; 8102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 82c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// If true, revoke the rosalloc thread-local buffers at the 83c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi// checkpoint, as opposed to during the pause. 84c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchistatic constexpr bool kRevokeRosAllocThreadLocalBuffersAtCheckpoint = true; 85c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 862b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::BindBitmaps() { 874446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("BindBitmaps"); 882b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Mark all of the spaces we never collect as immune. 9094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 911d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyNeverCollect) { 928d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier CHECK(immune_region_.AddContinuousSpace(space)) << "Failed to add space " << *space; 932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 954446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 972b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 981d54e73444e017d3a65234e0f193846f3e27472bIan RogersMarkSweep::MarkSweep(Heap* heap, bool is_concurrent, const std::string& name_prefix) 991d54e73444e017d3a65234e0f193846f3e27472bIan Rogers : GarbageCollector(heap, 100590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier name_prefix + 1011d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (is_concurrent ? "concurrent mark sweep": "mark sweep")), 10235883cc623fdf475a4ead1dafcba9e9becc1ed11Mathieu Chartier gc_barrier_(new Barrier(0)), 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() { 1085fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("InitializePhase", &timings_); 109e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier mark_stack_ = heap_->mark_stack_.get(); 110e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier DCHECK(mark_stack_ != nullptr); 1118d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier immune_region_.Reset(); 1122b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier class_count_ = 0; 1132b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier array_count_ = 0; 1142b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier other_count_ = 0; 1152b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier large_object_test_ = 0; 1162b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier large_object_mark_ = 0; 1172b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier overhead_time_ = 0; 1182b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier work_chunks_created_ = 0; 1192b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier work_chunks_deleted_ = 0; 1202b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier reference_count_ = 0; 1210e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_null_count_ = 0; 1220e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_immune_count_ = 0; 1230e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_fastpath_count_ = 0; 1240e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_slowpath_count_ = 0; 1250e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier { 1260e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // TODO: I don't think we should need heap bitmap lock to get the mark bitmap. 1270e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 1280e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_bitmap_ = heap_->GetMarkBitmap(); 1290e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 130df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi if (!clear_soft_references_) { 131df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi // Always clear soft references if a non-sticky collection. 132df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi clear_soft_references_ = GetGcType() != collector::kGcTypeSticky; 133df386c551405ce9668e827584f744c6f098761faHiroshi Yamauchi } 1346f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier} 1356f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier 1366f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartiervoid MarkSweep::RunPhases() { 1376f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Thread* self = Thread::Current(); 1386f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier InitializePhase(); 1396f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Locks::mutator_lock_->AssertNotHeld(self); 1406f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier if (IsConcurrent()) { 1416f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerification(this); 1426f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1436f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1446f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1456f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1466f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1476f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1486f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1496f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1506f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } else { 1516f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ScopedPause pause(this); 1526f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PreGcVerificationPaused(this); 1536f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier MarkingPhase(); 1546f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PrePauseRosAllocVerification(this); 1556f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier PausePhase(); 1566f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier RevokeAllThreadLocalBuffers(); 1576f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1586f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier { 1596f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Sweeping always done concurrently, even for non concurrent mark sweep. 1606f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReaderMutexLock mu(self, *Locks::mutator_lock_); 1616f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier ReclaimPhase(); 1626f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier } 1636f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier GetHeap()->PostGcVerification(this); 1646f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier FinishPhase(); 1652b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1662b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1672b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ProcessReferences(Thread* self) { 1685fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("ProcessReferences", &timings_); 1698e56c7e41cb37e2eaf553503968a01ff893b135bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 17078f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->ProcessReferences( 17178f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier true, &timings_, clear_soft_references_, &IsMarkedCallback, &MarkObjectCallback, 17278f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier &ProcessMarkStackCallback, this); 1731ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier} 1741ad2784ad9f311ebf9fe0677d33818648f423f9cMathieu Chartier 1750f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::PausePhase() { 1760f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier TimingLogger::ScopedSplit split("(Paused)PausePhase", &timings_); 1772b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 1782b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 1790f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (IsConcurrent()) { 1800f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Handle the dirty objects if we are a concurrent GC. 1812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1822b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Re-mark root set. 1832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ReMarkRoots(); 1842b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Scan dirty objects, this is only required if we are not doing concurrent GC. 18594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkDirtyObjects(true, accounting::CardTable::kCardDirty); 1862b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1870f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier { 1886f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier TimingLogger::ScopedSplit split("SwapStacks", &timings_); 1892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1900f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier heap_->SwapStacks(self); 1910f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier live_stack_freeze_size_ = heap_->GetLiveStack()->Size(); 1920f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Need to revoke all the thread local allocation stacks since we just swapped the allocation 1930f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // stacks and don't want anybody to allocate into the live stack. 194c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 1952b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1960f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier timings_.StartSplit("PreSweepingGcVerification"); 1970f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier heap_->PreSweepingGcVerification(this); 1980f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier timings_.EndSplit(); 1996f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // Disallow new system weaks to prevent a race which occurs when someone adds a new system 2006f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // weak before we sweep them. Since this new system weak may not be marked, the GC may 2016f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // incorrectly sweep it. This also fixes a race where interning may attempt to return a strong 2026f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier // reference to a string that is about to be swept. 2036f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Runtime::Current()->DisallowNewSystemWeaks(); 20478f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Enable the reference processing slow path, needs to be done with mutators paused since there 20578f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // is no lock in the GetReferent fast path. 20678f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier GetHeap()->GetReferenceProcessor()->EnableSlowPath(); 2072b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2082b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 209dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartiervoid MarkSweep::PreCleanCards() { 210dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Don't do this for non concurrent GCs since they don't have any dirty cards. 211dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier if (kPreCleanCards && IsConcurrent()) { 212dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier Thread* self = Thread::Current(); 213dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier CHECK(!Locks::mutator_lock_->IsExclusiveHeld(self)); 214dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process dirty cards and add dirty cards to mod union tables, also ages cards. 21538e68e9978236db87c9008bbe47db80525d2fa16Hiroshi Yamauchi heap_->ProcessCards(timings_, false); 216eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The checkpoint root marking is required to avoid a race condition which occurs if the 217eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // following happens during a reference write: 218eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 1. mutator dirties the card (write barrier) 219eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 2. GC ages the card (the above ProcessCards call) 220eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 3. GC scans the object (the RecursiveMarkDirtyObjects call below) 221eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // 4. mutator writes the value (corresponding to the write barrier in 1.) 222eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // This causes the GC to age the card but not necessarily mark the reference which the mutator 223eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // wrote into the object stored in the card. 224eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // Having the checkpoint fixes this issue since it ensures that the card mark and the 225eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // reference write are visible to the GC before the card is scanned (this is due to locks being 226eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // acquired / released in the checkpoint code). 227eb7bbad163ce7a2c60bba6e0d3d7488e5cfb2c05Mathieu Chartier // The other roots are also marked to help reduce the pause. 2280f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, false); 229dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier MarkNonThreadRoots(); 230893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 231893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagClearRootLog | kVisitRootFlagNewRoots)); 232dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Process the newly aged cards. 233dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier RecursiveMarkDirtyObjects(false, accounting::CardTable::kCardDirty - 1); 234dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // TODO: Empty allocation stack to reduce the number of objects we need to test / mark as live 235dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // in the next GC. 236dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier } 237dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier} 238dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier 239c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartiervoid MarkSweep::RevokeAllThreadLocalAllocationStacks(Thread* self) { 240c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier if (kUseThreadLocalAllocationStack) { 2410f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier timings_.NewSplit("RevokeAllThreadLocalAllocationStacks"); 242c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 243c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier heap_->RevokeAllThreadLocalAllocationStacks(self); 244c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier } 245c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier} 246c22c59ef8513b4cbbfd25073d1afbf58196b522aMathieu Chartier 2472b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkingPhase() { 2485fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("MarkingPhase", &timings_); 2492b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 2502b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2512b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier BindBitmaps(); 2520e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier FindDefaultSpaceBitmap(); 2534446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum 2542b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Process dirty cards and add dirty cards to mod union tables. 25538e68e9978236db87c9008bbe47db80525d2fa16Hiroshi Yamauchi heap_->ProcessCards(timings_, false); 2562b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2572b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 258893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkRoots(self); 2592b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkReachableObjects(); 260dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier // Pre-clean dirtied cards to reduce pauses. 261dda54f59271464b5a72bf4cde6d9010e8dc1f337Mathieu Chartier PreCleanCards(); 2622b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2632b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 26411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartiervoid MarkSweep::UpdateAndMarkModUnion() { 26511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier for (const auto& space : heap_->GetContinuousSpaces()) { 2668d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsSpace(space)) { 26711409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier const char* name = space->IsZygoteSpace() ? "UpdateAndMarkZygoteModUnionTable" : 26811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier "UpdateAndMarkImageModUnionTable"; 2695fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split(name, &timings_); 27011409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier accounting::ModUnionTable* mod_union_table = heap_->FindModUnionTableFromSpace(space); 27111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier CHECK(mod_union_table != nullptr); 272407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mod_union_table->UpdateAndMarkReferences(MarkHeapReferenceCallback, this); 27311409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 27411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 27511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier} 27611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier 2772b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkReachableObjects() { 2784aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier UpdateAndMarkModUnion(); 2792b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Recursively mark all the non-image bits set in the mark bitmap. 2802b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier RecursiveMark(); 2812b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2822b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ReclaimPhase() { 2845fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("ReclaimPhase", &timings_); 285720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 28678f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier // Process the references concurrently. 28778f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier ProcessReferences(self); 2880f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier SweepSystemWeaks(self); 2896f365cc033654a5a3b45eaa1379d4b5f156b0ceeMathieu Chartier Runtime::Current()->AllowNewSystemWeaks(); 2902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier { 2912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 2922b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Reclaim unmarked objects. 2941d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Sweep(false); 2952b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Swap the live and mark bitmaps for each space which we modified space. This is an 2972b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // optimization that enables us to not clear live bits inside of the sweep. Only swaps unbound 2982b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // bitmaps. 2994446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("SwapBitmaps"); 3002b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SwapBitmaps(); 3014446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 3022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3032b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Unbind the live and mark bitmaps. 304a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier TimingLogger::ScopedSplit split("UnBindBitmaps", &timings_); 305a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier GetHeap()->UnBindBitmaps(); 3062b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 3072b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 3082b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3090e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartiervoid MarkSweep::FindDefaultSpaceBitmap() { 3105fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("FindDefaultMarkBitmap", &timings_); 31102e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 312a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap = space->GetMarkBitmap(); 313bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // We want to have the main space instead of non moving if possible. 314590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (bitmap != nullptr && 315590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) { 3160e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = bitmap; 317bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // If we are not the non moving space exit the loop early since this will be good enough. 318bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (space != heap_->GetNonMovingSpace()) { 319bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier break; 320bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 321b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 322b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 323bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (current_space_bitmap_ == nullptr) { 324bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier heap_->DumpSpaces(); 325bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(FATAL) << "Could not find a default mark bitmap"; 326bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 32758551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 32858551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 329ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartiervoid MarkSweep::ExpandMarkStack() { 330ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier ResizeMarkStack(mark_stack_->Capacity() * 2); 331ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier} 332ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier 333ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartiervoid MarkSweep::ResizeMarkStack(size_t new_size) { 334ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Rare case, no need to have Thread::Current be a parameter. 335ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (UNLIKELY(mark_stack_->Size() < mark_stack_->Capacity())) { 336ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Someone else acquired the lock and expanded the mark stack before us. 337ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier return; 338ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 33902e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier std::vector<Object*> temp(mark_stack_->Begin(), mark_stack_->End()); 340ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier CHECK_LE(mark_stack_->Size(), new_size); 341ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier mark_stack_->Resize(new_size); 34202e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& obj : temp) { 34302e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier mark_stack_->PushBack(obj); 344ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 345ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 346ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 3470e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::MarkObjectNonNullParallel(Object* obj) { 348bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(obj != nullptr); 349ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (MarkObjectParallel(obj)) { 350ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 351ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 352184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier ExpandMarkStack(); 353ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 354ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier // The object must be pushed on to the mark stack. 3550e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 356ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 357ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 358ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 3593bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartiermirror::Object* MarkSweep::MarkObjectCallback(mirror::Object* obj, void* arg) { 36039e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier MarkSweep* mark_sweep = reinterpret_cast<MarkSweep*>(arg); 36139e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier mark_sweep->MarkObject(obj); 36239e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier return obj; 36339e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier} 36439e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier 365407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::MarkHeapReferenceCallback(mirror::HeapReference<mirror::Object>* ref, void* arg) { 366407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObject(ref->AsMirrorPtr()); 367407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier} 368407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 369bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartierclass MarkSweepMarkObjectSlowPath { 370bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier public: 371bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier explicit MarkSweepMarkObjectSlowPath(MarkSweep* mark_sweep) : mark_sweep_(mark_sweep) { 372bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 373bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 374bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier void operator()(const Object* obj) const ALWAYS_INLINE { 375bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kProfileLargeObjects) { 376bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: Differentiate between marking and testing somehow. 377bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_test_; 378bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_sweep_->large_object_mark_; 379bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 380bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier space::LargeObjectSpace* large_object_space = mark_sweep_->GetHeap()->GetLargeObjectsSpace(); 381a17288e3b9dd6751005fed3386251d2d0949be74Mathieu Chartier if (UNLIKELY(obj == nullptr || !IsAligned<kPageSize>(obj) || 382bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier (kIsDebugBuild && !large_object_space->Contains(obj)))) { 383bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(ERROR) << "Tried to mark " << obj << " not contained by any spaces"; 384bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(ERROR) << "Attempting see if it's a bad root"; 385bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier mark_sweep_->VerifyRoots(); 386bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(FATAL) << "Can't mark invalid object"; 387bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 388bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 389bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 390bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier private: 391bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweep* const mark_sweep_; 392bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier}; 393bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 3940e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::MarkObjectNonNull(Object* obj) { 3950e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 396624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 397624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 398624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 3999d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 4008d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 4010e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4020e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_immune_count_; 4030e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 404bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier DCHECK(mark_bitmap_->Test(obj)); 405bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else if (LIKELY(current_space_bitmap_->HasAddress(obj))) { 406bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kCountMarkedObjects) { 407bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier ++mark_fastpath_count_; 408bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 409bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (UNLIKELY(!current_space_bitmap_->Set(obj))) { 410bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // This object was not previously marked. 411bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } 412bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier } else { 4130e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 4140e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_slowpath_count_; 4150e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 416bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweepMarkObjectSlowPath visitor(this); 417bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // TODO: We already know that the object is not in the current_space_bitmap_ but MarkBitmap::Set 418bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // will check again. 419bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (!mark_bitmap_->Set(obj, visitor)) { 420bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier PushOnMarkStack(obj); // Was not already marked, push. 421357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 4220e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 4230e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier} 4240e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier 4250e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::PushOnMarkStack(Object* obj) { 4260e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 4270e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // Lock is not needed but is here anyways to please annotalysis. 4280e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 4290e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ExpandMarkStack(); 43069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 4310e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier // The object must be pushed on to the mark stack. 4320e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier mark_stack_->PushBack(obj); 43369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 43469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 43502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierinline bool MarkSweep::MarkObjectParallel(const Object* obj) { 4360e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK(obj != nullptr); 437624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi if (kUseBakerOrBrooksReadBarrier) { 438624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi // Verify all the objects have the correct pointer installed. 439624468cd401cc1ac0dd70c746301e0788a597759Hiroshi Yamauchi obj->AssertReadBarrierPointer(); 4409d04a20bde1b1855cefc64aebc1a44e253b1a13bHiroshi Yamauchi } 4418d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(obj)) { 44202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier DCHECK(IsMarked(obj)); 44302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 44402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 44502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 44602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // the hard way. 447a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* object_bitmap = current_space_bitmap_; 448bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (LIKELY(object_bitmap->HasAddress(obj))) { 449bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !object_bitmap->AtomicTestAndSet(obj); 45002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 451bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier MarkSweepMarkObjectSlowPath visitor(this); 452bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return !mark_bitmap_->AtomicTestAndSet(obj, visitor); 45302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 45402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 4550e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier// Used to mark objects when processing the mark stack. If an object is null, it is not marked. 4560e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartierinline void MarkSweep::MarkObject(Object* obj) { 4570e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (obj != nullptr) { 4589642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier MarkObjectNonNull(obj); 4590e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } else if (kCountMarkedObjects) { 4600e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++mark_null_count_; 46169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 46269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 46369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 4640e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartiervoid MarkSweep::MarkRootParallelCallback(Object** root, void* arg, uint32_t /*thread_id*/, 465815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier RootType /*root_type*/) { 466815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObjectNonNullParallel(*root); 467ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 468ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 469893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::VerifyRootMarked(Object** root, void* arg, uint32_t /*thread_id*/, 470893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier RootType /*root_type*/) { 471893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier CHECK(reinterpret_cast<MarkSweep*>(arg)->IsMarked(*root)); 472893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier} 473893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier 474815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartiervoid MarkSweep::MarkRootCallback(Object** root, void* arg, uint32_t /*thread_id*/, 475815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier RootType /*root_type*/) { 476815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObjectNonNull(*root); 477815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier} 478815873ecc312b1d231acce71e1a16f42cdaf09f2Mathieu Chartier 4796f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRootCallback(const Object* root, void* arg, size_t vreg, 4807bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier const StackVisitor* visitor, RootType root_type) { 4817bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->VerifyRoot(root, vreg, visitor, root_type); 4826f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 4836f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 4847bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartiervoid MarkSweep::VerifyRoot(const Object* root, size_t vreg, const StackVisitor* visitor, 4857bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier RootType root_type) { 4866f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier // See if the root is on any space bitmap. 487a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier if (heap_->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == nullptr) { 4881d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 4894202b7484dab71ca4dfc2109ebb3fd04b87badfbMathieu Chartier if (!large_object_space->Contains(root)) { 4907bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier LOG(ERROR) << "Found invalid root: " << root << " with type " << root_type; 49140e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogers if (visitor != NULL) { 49240e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogers LOG(ERROR) << visitor->DescribeLocation() << " in VReg: " << vreg; 4936f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 4946f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 4956f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 4966f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 4976f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 4986f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRoots() { 4996f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier Runtime::Current()->GetThreadList()->VerifyRoots(VerifyRootCallback, this); 5006f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5016f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 502893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkRoots(Thread* self) { 503893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 504893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // If we exclusively hold the mutator lock, all threads must be suspended. 505893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier timings_.StartSplit("MarkRoots"); 506893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Runtime::Current()->VisitRoots(MarkRootCallback, this); 507893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier timings_.EndSplit(); 508893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier RevokeAllThreadLocalAllocationStacks(self); 509893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } else { 5100f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier MarkRootsCheckpoint(self, kRevokeRosAllocThreadLocalBuffersAtCheckpoint); 511893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier // At this point the live stack should no longer have any mutators which push into it. 512893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkNonThreadRoots(); 513893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkConcurrentRoots( 514893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier static_cast<VisitRootFlags>(kVisitRootFlagAllRoots | kVisitRootFlagStartLoggingNewRoots)); 515893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 5169ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier} 5179ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier 518858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartiervoid MarkSweep::MarkNonThreadRoots() { 5194446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkNonThreadRoots"); 520423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier Runtime::Current()->VisitNonThreadRoots(MarkRootCallback, this); 5214446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 522858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 523858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 524893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartiervoid MarkSweep::MarkConcurrentRoots(VisitRootFlags flags) { 5254446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkConcurrentRoots"); 5261d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Visit all runtime roots and clear dirty flags. 527893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Runtime::Current()->VisitConcurrentRoots(MarkRootCallback, this, flags); 5284446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 52969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 53069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 53102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass ScanObjectVisitor { 532cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier public: 53394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE 53494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep) {} 535cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 536407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj) const ALWAYS_INLINE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 537407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 53894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 5392b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 5402b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 5412b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 54202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_sweep_->ScanObject(obj); 543cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 544cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 545cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier private: 546cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier MarkSweep* const mark_sweep_; 547cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 548cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 549407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartierclass DelayReferenceReferentVisitor { 550407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 551407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit DelayReferenceReferentVisitor(MarkSweep* collector) : collector_(collector) { 552407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 553407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 554407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(mirror::Class* klass, mirror::Reference* ref) const 555407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 556407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 557407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier collector_->DelayReferenceReferent(klass, ref); 558407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 559407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 560407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 561407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const collector_; 562407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier}; 563407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 56494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiertemplate <bool kUseFinger = false> 56594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass MarkStackTask : public Task { 56694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 56794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, size_t mark_stack_size, 5680e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object** mark_stack) 56994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep), 57094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_(thread_pool), 57194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_(mark_stack_size) { 57294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We may have to copy part of an existing mark stack when another mark stack overflows. 57394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_size != 0) { 57494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(mark_stack != NULL); 57594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Check performance? 57694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier std::copy(mark_stack, mark_stack + mark_stack_size, mark_stack_); 57794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 57894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 57994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_created_; 5801d54e73444e017d3a65234e0f193846f3e27472bIan Rogers } 581262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier } 582262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 58394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kMaxSize = 1 * KB; 584cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 58594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 586407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier class MarkObjectParallelVisitor { 587407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier public: 588407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit MarkObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task, 589407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* mark_sweep) ALWAYS_INLINE 590407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier : chunk_task_(chunk_task), mark_sweep_(mark_sweep) {} 591407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 592407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj, MemberOffset offset, bool /* static */) const ALWAYS_INLINE 593407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 594b0fa5dc7769c1e054032f39de0a3f6d6dd06f8cfIan Rogers mirror::Object* ref = obj->GetFieldObject<mirror::Object>(offset); 595407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (ref != nullptr && mark_sweep_->MarkObjectParallel(ref)) { 596407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (kUseFinger) { 597407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier android_memory_barrier(); 598407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier if (reinterpret_cast<uintptr_t>(ref) >= 599407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier static_cast<uintptr_t>(mark_sweep_->atomic_finger_)) { 600407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier return; 601407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 602407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 603407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier chunk_task_->MarkStackPush(ref); 604407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 605407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 606407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 607407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier private: 608407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 609407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep_; 610407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier }; 611407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier 61294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier class ScanObjectParallelVisitor { 61394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 61494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task) ALWAYS_INLINE 61594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : chunk_task_(chunk_task) {} 61694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 617407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier // No thread safety analysis since multiple threads will use this visitor. 618407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj) const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 619407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 620407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkSweep* const mark_sweep = chunk_task_->mark_sweep_; 621407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectParallelVisitor mark_visitor(chunk_task_, mark_sweep); 622407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(mark_sweep); 623407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier mark_sweep->ScanObjectVisit(obj, mark_visitor, ref_visitor); 62494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 62594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 62694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier private: 62794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 62894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier }; 62994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 63094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual ~MarkStackTask() { 63194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Make sure that we have cleared our mark stack. 63294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_EQ(mark_stack_pos_, 0U); 63394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 63494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_deleted_; 6352b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 636cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 637cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 63894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkSweep* const mark_sweep_; 63994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* const thread_pool_; 64094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Thread local mark stack for this task. 6410e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object* mark_stack_[kMaxSize]; 64294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack position. 64394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_pos_; 64494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 6450e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier void MarkStackPush(Object* obj) ALWAYS_INLINE { 64694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == kMaxSize)) { 64794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack overflow, give 1/2 the stack to the thread pool as a new work task. 64894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_ /= 2; 64994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new MarkStackTask(thread_pool_, mark_sweep_, kMaxSize - mark_stack_pos_, 65094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_ + mark_stack_pos_); 65194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_->AddTask(Thread::Current(), task); 65294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 65394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != nullptr); 6540e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_LT(mark_stack_pos_, kMaxSize); 65594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_[mark_stack_pos_++] = obj; 65694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 65794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 65894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 65994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 66094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 66194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 66294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 663407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier virtual void Run(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 664407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 66594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 66694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 66794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 6680e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier BoundedFifoPowerOfTwo<Object*, kFifoSize> prefetch_fifo; 66994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (;;) { 6700e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object* obj = nullptr; 67194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 67294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (mark_stack_pos_ != 0 && prefetch_fifo.size() < kFifoSize) { 6730e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object* obj = mark_stack_[--mark_stack_pos_]; 67411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 67594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier __builtin_prefetch(obj); 67694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.push_back(obj); 67794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 67894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(prefetch_fifo.empty())) { 67994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 68094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 68194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 68294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 68394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 68494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == 0)) { 68594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 68694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 68794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_[--mark_stack_pos_]; 68894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 68911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 6900e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier visitor(obj); 69194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 69294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 69394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 69494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 69594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass CardScanTask : public MarkStackTask<false> { 69694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 697a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier CardScanTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 698a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, 69994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* begin, byte* end, byte minimum_age, size_t mark_stack_size, 7000e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object** mark_stack_obj) 70194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, mark_stack_size, mark_stack_obj), 70294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 70394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 70494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end), 70594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier minimum_age_(minimum_age) { 70694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 70794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 70894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 709a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 71094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* const begin_; 71194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* const end_; 71294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const byte minimum_age_; 71394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 71494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 71594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 71694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 71794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 71894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 71994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 72094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = mark_sweep_->GetHeap()->GetCardTable(); 7210f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier size_t cards_scanned = card_table->Scan(bitmap_, begin_, end_, visitor, minimum_age_); 7220f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier VLOG(heap) << "Parallel scanning cards " << reinterpret_cast<void*>(begin_) << " - " 7230f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier << reinterpret_cast<void*>(end_) << " = " << cards_scanned; 72494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 72594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 72694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 727cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 728cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 7292775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiersize_t MarkSweep::GetThreadCount(bool paused) const { 7302775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (heap_->GetThreadPool() == nullptr || !heap_->CareAboutPauseTimes()) { 731bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return 1; 7322775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 7332775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (paused) { 7342775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier return heap_->GetParallelGCThreadCount() + 1; 7352775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } else { 7362775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier return heap_->GetConcGCThreadCount() + 1; 7372775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 7382775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier} 7392775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier 74094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ScanGrayObjects(bool paused, byte minimum_age) { 74194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = GetHeap()->GetCardTable(); 74294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 7432775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 7442775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier // The parallel version with only one thread is faster for card scanning, TODO: fix. 745bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (kParallelCardScan && thread_count > 1) { 746720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 74794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Can't have a different split for each space since multiple spaces can have their cards being 74894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // scanned at the same time. 74994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayObjects" : "ScanGrayObjects"); 75094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Try to take some of the mark stack since we can pass this off to the worker tasks. 7510e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object** mark_stack_begin = mark_stack_->Begin(); 7520e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier Object** mark_stack_end = mark_stack_->End(); 753720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier const size_t mark_stack_size = mark_stack_end - mark_stack_begin; 75494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Estimated number of work tasks we will create. 75594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_tasks = GetHeap()->GetContinuousSpaces().size() * thread_count; 75694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_NE(mark_stack_tasks, 0U); 75794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_delta = std::min(CardScanTask::kMaxSize / 2, 75894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_size / mark_stack_tasks + 1); 75994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 760590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() == nullptr) { 761590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 762590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 76394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* card_begin = space->Begin(); 76494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* card_end = space->End(); 7650941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Align up the end address. For example, the image space's end 7660941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // may not be card-size-aligned. 7670941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi card_end = AlignUp(card_end, accounting::CardTable::kCardSize); 7680941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi DCHECK(IsAligned<accounting::CardTable::kCardSize>(card_begin)); 7690941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi DCHECK(IsAligned<accounting::CardTable::kCardSize>(card_end)); 77094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how many bytes of heap we will scan, 77194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t address_range = card_end - card_begin; 77294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how much address range each task gets. 77394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t card_delta = RoundUp(address_range / thread_count + 1, 77494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable::kCardSize); 77594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create the worker tasks for this space. 77694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (card_begin != card_end) { 77794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add a range of cards. 77894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t addr_remaining = card_end - card_begin; 77994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t card_increment = std::min(card_delta, addr_remaining); 78094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Take from the back of the mark stack. 78194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_remaining = mark_stack_end - mark_stack_begin; 78294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining); 78394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_end -= mark_stack_increment; 78494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment)); 7850e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier DCHECK_EQ(mark_stack_end, mark_stack_->End()); 78694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add the new task to the thread pool. 78794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new CardScanTask(thread_pool, this, space->GetMarkBitmap(), card_begin, 78894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin + card_increment, minimum_age, 78994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_increment, mark_stack_end); 79094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 79194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin += card_increment; 79294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 79394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 7940f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 7950941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Note: the card scan below may dirty new cards (and scan them) 7960941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // as a side effect when a Reference object is encountered and 7970941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // queued during the marking. See b/11465268. 7982775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 79994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 8002775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 80194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 80294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.EndSplit(); 80394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 80494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 805590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() != nullptr) { 806590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Image spaces are handled properly since live == marked for them. 807590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier switch (space->GetGcRetentionPolicy()) { 808590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyNeverCollect: 809590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayImageSpaceObjects" : 810590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayImageSpaceObjects"); 811590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 812590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyFullCollect: 813590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayZygoteSpaceObjects" : 814590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayZygoteSpaceObjects"); 815590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 816590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyAlwaysCollect: 817590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayAllocSpaceObjects" : 818590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayAllocSpaceObjects"); 819590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 820590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 821590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier ScanObjectVisitor visitor(this); 822590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier card_table->Scan(space->GetMarkBitmap(), space->Begin(), space->End(), visitor, minimum_age); 823590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.EndSplit(); 824590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 82594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 82694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 82794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier} 82894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 82994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass RecursiveMarkTask : public MarkStackTask<false> { 83094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 83194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 832a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* bitmap, uintptr_t begin, uintptr_t end) 83394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, 0, NULL), 83494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 83594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 83694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end) { 83794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 83894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 83994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 840a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* const bitmap_; 84194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t begin_; 84294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t end_; 84394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 84494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 84594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 84694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 84794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 84894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 84994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 85094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 85194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_->VisitMarkedRange(begin_, end_, visitor); 85294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 85394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 85494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 85594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 85694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 85758551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// Populates the mark stack based on the set of marked objects and 85858551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// recursively marks until the mark stack is emptied. 8592b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::RecursiveMark() { 8605fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("RecursiveMark", &timings_); 861a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // RecursiveMark will build the lists of known instances of the Reference classes. See 862a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // DelayReferenceReferent for details. 86394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseRecursiveMark) { 86494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const bool partial = GetGcType() == kGcTypePartial; 86594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectVisitor scan_visitor(this); 86694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* self = Thread::Current(); 86794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = heap_->GetThreadPool(); 8682775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(false); 8692775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const bool parallel = kParallelRecursiveMark && thread_count > 1; 87094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->Reset(); 87102e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 8721d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if ((space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) || 8731d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (!partial && space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) { 8740e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_ = space->GetMarkBitmap(); 8750e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_ == nullptr) { 876590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 8772b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 87894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (parallel) { 87994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We will use the mark stack the future. 88094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // CHECK(mark_stack_->IsEmpty()); 88194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 88294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 88394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 88494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier atomic_finger_ = static_cast<int32_t>(0xFFFFFFFF); 88594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 88694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create a few worker tasks. 8872775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t n = thread_count * 2; 88894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (begin != end) { 88994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t start = begin; 89094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t delta = (end - begin) / n; 89194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delta = RoundUp(delta, KB); 89294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (delta < 16 * KB) delta = end - begin; 89394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin += delta; 8940e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier auto* task = new RecursiveMarkTask(thread_pool, this, current_space_bitmap_, start, 89594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin); 89694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 89794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 8982775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 89994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 9002775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 90194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 90294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 90394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 90494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 90594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 9060e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier current_space_bitmap_->VisitMarkedRange(begin, end, scan_visitor); 90794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 908357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 909357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 910357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 91194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(false); 91258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 91358551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 91483c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartiermirror::Object* MarkSweep::IsMarkedCallback(mirror::Object* object, void* arg) { 9155712d5d04640925970db9c98938ffaf806b3962cMathieu Chartier if (reinterpret_cast<MarkSweep*>(arg)->IsMarked(object)) { 9166aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return object; 9176aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier } 9186aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return nullptr; 919357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 920357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 92194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::RecursiveMarkDirtyObjects(bool paused, byte minimum_age) { 92294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanGrayObjects(paused, minimum_age); 92394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(paused); 924262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier} 925262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 92658551df3c2646ed507feec9e9eb3768085a76059Carl Shapirovoid MarkSweep::ReMarkRoots() { 927893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(Thread::Current()); 9283bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier timings_.StartSplit("(Paused)ReMarkRoots"); 929893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Runtime::Current()->VisitRoots( 930893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier MarkRootCallback, this, static_cast<VisitRootFlags>(kVisitRootFlagNewRoots | 931893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier kVisitRootFlagStopLoggingNewRoots | 932893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier kVisitRootFlagClearRootLog)); 9334446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 9347bf9f190cd33a7e2f8584299eb889e9df66e0323Mathieu Chartier if (kVerifyRootsMarked) { 935893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier timings_.StartSplit("(Paused)VerifyRoots"); 936893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier Runtime::Current()->VisitRoots(VerifyRootMarked, this); 937893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier timings_.EndSplit(); 938893263b7d5bc2ca43a91ecb8071867f5134fc60aMathieu Chartier } 93958551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 94058551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 9410f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::SweepSystemWeaks(Thread* self) { 9420f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 9434446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("SweepSystemWeaks"); 9440f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier Runtime::Current()->SweepSystemWeaks(IsMarkedCallback, this); 9454446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 94669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 94769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 9486aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartiermirror::Object* MarkSweep::VerifySystemWeakIsLiveCallback(Object* obj, void* arg) { 949c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->VerifyIsLive(obj); 950c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier // We don't actually want to sweep the object, so lets return "marked" 9516aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return obj; 952c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 953c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 954c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifyIsLive(const Object* obj) { 9554aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier if (!heap_->GetLiveBitmap()->Test(obj)) { 956bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier if (std::find(heap_->allocation_stack_->Begin(), heap_->allocation_stack_->End(), obj) == 957bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier heap_->allocation_stack_->End()) { 958bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier // Object not found! 959bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier heap_->DumpSpaces(); 960bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier LOG(FATAL) << "Found dead object " << obj; 961c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 962c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 963c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 964c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 965c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifySystemWeaks() { 9666aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier // Verify system weaks, uses a special object visitor which returns the input object. 9676aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier Runtime::Current()->SweepSystemWeaks(VerifySystemWeakIsLiveCallback, this); 968c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 969c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 9700e4627e593bc39f8e3d89c31f8977d55054c07ccMathieu Chartierclass CheckpointMarkThreadRoots : public Closure { 971858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier public: 9720f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier explicit CheckpointMarkThreadRoots(MarkSweep* mark_sweep, 9730f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) 9740f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier : mark_sweep_(mark_sweep), 9750f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint_( 9760f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 9770f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier } 978858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 9794aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier virtual void Run(Thread* thread) OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 9803f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_BEGIN("Marking thread roots"); 981858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier // Note: self is not necessarily equal to thread since thread may be suspended. 982858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier Thread* self = Thread::Current(); 983d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier CHECK(thread == self || thread->IsSuspended() || thread->GetState() == kWaitingPerformingGc) 984d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << thread->GetState() << " thread " << thread << " self " << self; 985ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier thread->VisitRoots(MarkSweep::MarkRootParallelCallback, mark_sweep_); 9863f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_END(); 9870f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier if (revoke_ros_alloc_thread_local_buffers_at_checkpoint_) { 9880f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_BEGIN("RevokeRosAllocThreadLocalBuffers"); 989c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi mark_sweep_->GetHeap()->RevokeRosAllocThreadLocalBuffers(thread); 9900f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier ATRACE_END(); 991c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 992858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier mark_sweep_->GetBarrier().Pass(self); 993858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier } 994858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 995858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier private: 9964aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier MarkSweep* const mark_sweep_; 9970f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier const bool revoke_ros_alloc_thread_local_buffers_at_checkpoint_; 998858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier}; 999858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 10000f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartiervoid MarkSweep::MarkRootsCheckpoint(Thread* self, 10010f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier bool revoke_ros_alloc_thread_local_buffers_at_checkpoint) { 10020f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CheckpointMarkThreadRoots check_point(this, revoke_ros_alloc_thread_local_buffers_at_checkpoint); 10034446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkRootsCheckpoint"); 1004858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 10051d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Request the check point is run on all threads returning a count of the threads that must 10061d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // run through the barrier including self. 10071d54e73444e017d3a65234e0f193846f3e27472bIan Rogers size_t barrier_count = thread_list->RunCheckpoint(&check_point); 10081d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Release locks then wait for all mutator threads to pass the barrier. 10091d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // TODO: optimize to not release locks when there are no threads to wait for. 10101d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 10111d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedUnlock(self); 10124aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier { 10134aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier ScopedThreadStateChange tsc(self, kWaitingForCheckPointsToRun); 10144aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier gc_barrier_->Increment(self, barrier_count); 10154aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier } 10161d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedLock(self); 10171d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveLock(self); 10184446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1019858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 1020858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 10211d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::SweepArray(accounting::ObjectStack* allocations, bool swap_bitmaps) { 102294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.StartSplit("SweepArray"); 1023e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Thread* self = Thread::Current(); 1024e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier mirror::Object* chunk_free_buffer[kSweepArrayChunkFreeSize]; 1025e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t chunk_free_pos = 0; 1026e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_bytes = 0; 1027e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_large_object_bytes = 0; 1028e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_objects = 0; 1029e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_large_objects = 0; 1030e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // How many objects are left in the array, modified after each space is swept. 10310f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier Object** objects = allocations->Begin(); 1032e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t count = allocations->Size(); 1033e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Change the order to ensure that the non-moving space last swept as an optimization. 1034e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::vector<space::ContinuousSpace*> sweep_spaces; 1035e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::ContinuousSpace* non_moving_space = nullptr; 1036e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : heap_->GetContinuousSpaces()) { 10378d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (space->IsAllocSpace() && !immune_region_.ContainsSpace(space) && 10388d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier space->GetLiveBitmap() != nullptr) { 1039e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space == heap_->GetNonMovingSpace()) { 1040e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier non_moving_space = space; 1041e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1042e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(space); 1043e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1044e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1045e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1046e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Unlikely to sweep a significant amount of non_movable objects, so we do these after the after 1047e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the other alloc spaces as an optimization. 1048e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (non_moving_space != nullptr) { 1049e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(non_moving_space); 1050e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1051e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Start by sweeping the continuous spaces. 1052e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : sweep_spaces) { 1053e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::AllocSpace* alloc_space = space->AsAllocSpace(); 1054a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* live_bitmap = space->GetLiveBitmap(); 1055a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); 1056e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (swap_bitmaps) { 1057e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::swap(live_bitmap, mark_bitmap); 1058e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1059e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Object** out = objects; 1060e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (size_t i = 0; i < count; ++i) { 1061e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Object* obj = objects[i]; 1062f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1063f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1064f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1065e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space->HasAddress(obj)) { 1066e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // This object is in the space, remove it from the array and add it to the sweep buffer 1067e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // if needed. 1068e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!mark_bitmap->Test(obj)) { 1069e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos >= kSweepArrayChunkFreeSize) { 1070e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.StartSplit("FreeList"); 1071e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_objects += chunk_free_pos; 1072e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1073e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.EndSplit(); 1074e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1075e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1076e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_buffer[chunk_free_pos++] = obj; 1077e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1078e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1079e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier *(out++) = obj; 1080e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1081e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1082e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos > 0) { 1083e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.StartSplit("FreeList"); 1084e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_objects += chunk_free_pos; 1085e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1086e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.EndSplit(); 1087e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1088e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1089e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // All of the references which space contained are no longer in the allocation stack, update 1090e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the count. 1091e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier count = out - objects; 1092e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1093e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle the large object space. 10941d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 1095bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier accounting::LargeObjectBitmap* large_live_objects = large_object_space->GetLiveBitmap(); 1096bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier accounting::LargeObjectBitmap* large_mark_objects = large_object_space->GetMarkBitmap(); 1097357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier if (swap_bitmaps) { 1098e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier std::swap(large_live_objects, large_mark_objects); 1099357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 110002c8cc6d1312a2b55533f02f6369dc7c94672f90Brian Carlstrom for (size_t i = 0; i < count; ++i) { 1101357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier Object* obj = objects[i]; 1102e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle large objects. 1103f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1104f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1105f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1106e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!large_mark_objects->Test(obj)) { 1107e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier ++freed_large_objects; 1108e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier freed_large_object_bytes += large_object_space->Free(self, obj); 1109357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1110357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 11114446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1112357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 1113b22a451675c29ac3fc82a8761d2a385a170d6d7fHiroshi Yamauchi timings_.StartSplit("RecordFree"); 1114e76e70f424468f311c2061c291e8384263f3968cMathieu Chartier VLOG(heap) << "Freed " << freed_objects << "/" << count << " objects with size " 1115e76e70f424468f311c2061c291e8384263f3968cMathieu Chartier << PrettySize(freed_bytes); 1116e76e70f424468f311c2061c291e8384263f3968cMathieu Chartier RecordFree(freed_objects, freed_bytes); 1117e76e70f424468f311c2061c291e8384263f3968cMathieu Chartier RecordFreeLargeObjects(freed_large_objects, freed_large_object_bytes); 11184446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 11191d54e73444e017d3a65234e0f193846f3e27472bIan Rogers 11204446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("ResetStack"); 1121357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier allocations->Reset(); 11224446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1123357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 1124357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 11251d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::Sweep(bool swap_bitmaps) { 11260f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Ensure that nobody inserted items in the live stack after we swapped the stacks. 11270f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier CHECK_GE(live_stack_freeze_size_, GetHeap()->GetLiveStack()->Size()); 11280f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // Mark everything allocated since the last as GC live so that we can sweep concurrently, 11290f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier // knowing that new allocations won't be marked as live. 11300f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier timings_.StartSplit("MarkStackAsLive"); 11310f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier accounting::ObjectStack* live_stack = heap_->GetLiveStack(); 11320f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier heap_->MarkAllocStackAsLive(live_stack); 11330f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier live_stack->Reset(); 11340f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier timings_.EndSplit(); 11350f7bf6a3ad1798fde328a2bff48a4bf2d750a36bMathieu Chartier 1136b43b7d42b0c497333564e76be953157066c2b995Mathieu Chartier DCHECK(mark_stack_->IsEmpty()); 113702e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1138a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier if (space->IsContinuousMemMapAllocSpace()) { 1139a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); 1140ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier TimingLogger::ScopedSplit split( 1141a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier alloc_space->IsZygoteSpace() ? "SweepZygoteSpace" : "SweepMallocSpace", &timings_); 1142ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier size_t freed_objects = 0; 1143ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier size_t freed_bytes = 0; 1144a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier alloc_space->Sweep(swap_bitmaps, &freed_objects, &freed_bytes); 1145e76e70f424468f311c2061c291e8384263f3968cMathieu Chartier RecordFree(freed_objects, freed_bytes); 114658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 114758551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 11482b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SweepLargeObjects(swap_bitmaps); 114958551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 115058551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 1151e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartiervoid MarkSweep::SweepLargeObjects(bool swap_bitmaps) { 1152bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier TimingLogger::ScopedSplit split("SweepLargeObjects", &timings_); 1153e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier size_t freed_objects = 0; 11542fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier size_t freed_bytes = 0; 1155bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier heap_->GetLargeObjectsSpace()->Sweep(swap_bitmaps, &freed_objects, &freed_bytes); 1156e76e70f424468f311c2061c291e8384263f3968cMathieu Chartier RecordFreeLargeObjects(freed_objects, freed_bytes); 1157e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier} 1158e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier 1159407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// Process the "referent" field in a java.lang.ref.Reference. If the referent has not yet been 1160407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier// marked, put it on the appropriate list in the heap for later processing. 1161407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartiervoid MarkSweep::DelayReferenceReferent(mirror::Class* klass, mirror::Reference* ref) { 116294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(klass != nullptr); 11630e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountJavaLangRefs) { 11640e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier ++reference_count_; 11650e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 116678f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier heap_->GetReferenceProcessor()->DelayReferenceReferent(klass, ref, IsMarkedCallback, this); 116769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 116869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 116902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass MarkObjectVisitor { 117002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier public: 1171407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier explicit MarkObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE : mark_sweep_(mark_sweep) { 1172407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier } 117302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 1174407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier void operator()(Object* obj, MemberOffset offset, bool /* is_static */) const 1175407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ALWAYS_INLINE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1176407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 117794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 11782b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 11792b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 11802b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1181b0fa5dc7769c1e054032f39de0a3f6d6dd06f8cfIan Rogers mark_sweep_->MarkObject(obj->GetFieldObject<mirror::Object>(offset)); 118202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 118302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 118402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier private: 118502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MarkSweep* const mark_sweep_; 118602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier}; 118702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 118869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Scans an object reference. Determines the type of the reference 118969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// and dispatches to a specialized scanning routine. 1190590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartiervoid MarkSweep::ScanObject(Object* obj) { 1191407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier MarkObjectVisitor mark_visitor(this); 1192407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier DelayReferenceReferentVisitor ref_visitor(this); 1193407f702da4f867c074fc3c8c688b8f8c32279effMathieu Chartier ScanObjectVisit(obj, mark_visitor, ref_visitor); 119402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 119502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 119678f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartiervoid MarkSweep::ProcessMarkStackCallback(void* arg) { 119778f7b4c04ab6e8b5581921bc95b67a9beee1c246Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->ProcessMarkStack(false); 11983bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier} 11993bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier 12002775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiervoid MarkSweep::ProcessMarkStackParallel(size_t thread_count) { 120102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier Thread* self = Thread::Current(); 120202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 12032775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t chunk_size = std::min(mark_stack_->Size() / thread_count + 1, 12042775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier static_cast<size_t>(MarkStackTask<false>::kMaxSize)); 120594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier CHECK_GT(chunk_size, 0U); 120694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Split the current mark stack up into work tasks. 120794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (mirror::Object **it = mark_stack_->Begin(), **end = mark_stack_->End(); it < end; ) { 120894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t delta = std::min(static_cast<size_t>(end - it), chunk_size); 12090e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier thread_pool->AddTask(self, new MarkStackTask<false>(thread_pool, this, delta, it)); 121094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier it += delta; 121102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 12122775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 121302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier thread_pool->StartWorkers(self); 12142775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 121594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 121602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_stack_->Reset(); 121702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier CHECK_EQ(work_chunks_created_, work_chunks_deleted_) << " some of the work chunks were leaked"; 121869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 121969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 12205d76c435082332ef79a22962386fa92a0870e378Ian Rogers// Scan anything that's on the mark stack. 122194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ProcessMarkStack(bool paused) { 12223bb57c7b41bf5419fe895e7aa664d8d430205ba8Mathieu Chartier timings_.StartSplit(paused ? "(Paused)ProcessMarkStack" : "ProcessMarkStack"); 12232775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 12242775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelProcessMarkStack && thread_count > 1 && 12252775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier mark_stack_->Size() >= kMinimumParallelMarkStackSize) { 12262775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier ProcessMarkStackParallel(thread_count); 122794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 122894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 122994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 1230590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier BoundedFifoPowerOfTwo<Object*, kFifoSize> prefetch_fifo; 1231d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier for (;;) { 1232590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Object* obj = NULL; 123394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 123494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (!mark_stack_->IsEmpty() && prefetch_fifo.size() < kFifoSize) { 1235590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Object* obj = mark_stack_->PopBack(); 123694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != NULL); 123794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier __builtin_prefetch(obj); 123894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.push_back(obj); 123994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 124094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (prefetch_fifo.empty()) { 124194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 124294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 124394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 124494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 124594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 124694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_->IsEmpty()) { 124794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 124894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 124994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_->PopBack(); 1250d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier } 12514aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier DCHECK(obj != nullptr); 1252d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier ScanObject(obj); 1253357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1254357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 12554446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 125669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 125769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 12587469ebf3888b8037421cb6834f37f946646265ecMathieu Chartierinline bool MarkSweep::IsMarked(const Object* object) const 12597469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 12608d562103c3a3452fb15ef4b1c64df767b70507a4Mathieu Chartier if (immune_region_.ContainsObject(object)) { 12617469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier return true; 12627469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 12630e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (current_space_bitmap_->HasAddress(object)) { 12640e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier return current_space_bitmap_->Test(object); 12657469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 12660e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier return mark_bitmap_->Test(object); 12677469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier} 12687469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier 12692b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::FinishPhase() { 12705fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("FinishPhase", &timings_); 1271d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountScannedTypes) { 1272d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "MarkSweep scanned classes=" << class_count_ << " arrays=" << array_count_ 1273d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << " other=" << other_count_; 127402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 127502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kCountTasks) { 1276d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Total number of work chunks allocated: " << work_chunks_created_; 127702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 127802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kMeasureOverhead) { 1279d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Overhead time " << PrettyDuration(overhead_time_); 128002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 128102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 1282d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Large objects tested " << large_object_test_ << " marked " << large_object_mark_; 128302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 1284d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountJavaLangRefs) { 1285d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "References scanned " << reference_count_; 128602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 12870e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier if (kCountMarkedObjects) { 12880e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier VLOG(gc) << "Marked: null=" << mark_null_count_ << " immune=" << mark_immune_count_ 12890e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier << " fastpath=" << mark_fastpath_count_ << " slowpath=" << mark_slowpath_count_; 12900e54cd0d8fc635d3dc8bf88a465fdade151a098fMathieu Chartier } 12914aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier CHECK(mark_stack_->IsEmpty()); // Ensure that the mark stack is empty. 12925301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier mark_stack_->Reset(); 12934aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 12944aeec176eaf11fe03f342aadcbb79142230270edMathieu Chartier heap_->ClearMarkedObjects(); 129569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 129669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 1297c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchivoid MarkSweep::RevokeAllThreadLocalBuffers() { 1298c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi if (kRevokeRosAllocThreadLocalBuffersAtCheckpoint && IsConcurrent()) { 1299c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // If concurrent, rosalloc thread-local buffers are revoked at the 1300c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // thread checkpoint. Bump pointer space thread-local buffers must 1301c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi // not be in use. 1302c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->AssertAllBumpPointerSpaceThreadLocalBuffersAreRevoked(); 1303c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } else { 1304c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi timings_.StartSplit("(Paused)RevokeAllThreadLocalBuffers"); 1305c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi GetHeap()->RevokeAllThreadLocalBuffers(); 1306c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi timings_.EndSplit(); 1307c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi } 1308c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi} 1309c93c530efc175954160c3834c93961a1a946a35aHiroshi Yamauchi 13101d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace collector 13111d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace gc 131269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} // namespace art 1313