mark_sweep.cc revision f5b0e20b5b31f5f5465784adcf2a204dcd69c7fd
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" 301d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/accounting/heap_bitmap.h" 3111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier#include "gc/accounting/mod_union_table.h" 321d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/accounting/space_bitmap-inl.h" 331d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/heap.h" 341d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/image_space.h" 351d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/large_object_space.h" 361d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "gc/space/space-inl.h" 37410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughes#include "indirect_reference_table.h" 38410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughes#include "intern_table.h" 3981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#include "jni_internal.h" 40c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes#include "monitor.h" 412dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mark_sweep-inl.h" 42ea46f950e7a51585db293cd7f047de190a482414Brian Carlstrom#include "mirror/art_field.h" 43ea46f950e7a51585db293cd7f047de190a482414Brian Carlstrom#include "mirror/art_field-inl.h" 442dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/class-inl.h" 452dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/class_loader.h" 462dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/dex_cache.h" 472dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object-inl.h" 482dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object_array.h" 492dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object_array-inl.h" 501f87008b165d26541d832ff805250afdc89c253dBrian Carlstrom#include "runtime.h" 511d54e73444e017d3a65234e0f193846f3e27472bIan Rogers#include "thread-inl.h" 526f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier#include "thread_list.h" 5308254278f290c2541cecd24ce6b7015427f4eae5Ian Rogers#include "verifier/method_verifier.h" 5469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 55ea46f950e7a51585db293cd7f047de190a482414Brian Carlstromusing ::art::mirror::ArtField; 563e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::Class; 573e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::Object; 583e3d591f781b771de89f3b989830da2b6ac6fac8Brian Carlstromusing ::art::mirror::ObjectArray; 592dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers 6069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapironamespace art { 611d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace gc { 621d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace collector { 6369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 6402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Performance options. 6594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kUseRecursiveMark = false; 6694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kUseMarkStackPrefetch = true; 6794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr size_t kSweepArrayChunkFreeSize = 1024; 6894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 6994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Parallelism options. 7094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kParallelCardScan = true; 7194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kParallelRecursiveMark = true; 7294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Don't attempt to parallelize mark stack processing unless the mark stack is at least n 7394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// elements. This is temporary until we reduce the overhead caused by allocating tasks, etc.. Not 7494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// having this can add overhead in ProcessReferences since we may end up doing many calls of 7594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// ProcessMarkStack with very small mark stacks. 7694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr size_t kMinimumParallelMarkStackSize = 128; 7794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kParallelProcessMarkStack = true; 78858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 7902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Profiling and information flags. 8094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kCountClassesMarked = false; 8194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kProfileLargeObjects = false; 8294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kMeasureOverhead = false; 8394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kCountTasks = false; 8494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kCountJavaLangRefs = false; 8594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 8694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// Turn off kCheckLocks when profiling the GC since it slows the GC down by up to 40%. 8794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierconstexpr bool kCheckLocks = kDebugLocking; 8802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 891d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::ImmuneSpace(space::ContinuousSpace* space) { 902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Bind live to mark bitmap if necessary. 912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier if (space->GetLiveBitmap() != space->GetMarkBitmap()) { 92a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier CHECK(space->IsContinuousMemMapAllocSpace()); 93a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier space->AsContinuousMemMapAllocSpace()->BindLiveToMarkBitmap(); 942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 952b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Add the space to the immune region. 97590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // TODO: Use space limits instead of current end_ since the end_ can be changed by dlmalloc 98590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // callbacks. 992b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier if (immune_begin_ == NULL) { 1002b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier DCHECK(immune_end_ == NULL); 1012b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SetImmuneRange(reinterpret_cast<Object*>(space->Begin()), 1022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier reinterpret_cast<Object*>(space->End())); 1032b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } else { 10402e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier const space::ContinuousSpace* prev_space = nullptr; 1051d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Find out if the previous space is immune. 10611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier for (const space::ContinuousSpace* cur_space : GetHeap()->GetContinuousSpaces()) { 10702e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier if (cur_space == space) { 1081d54e73444e017d3a65234e0f193846f3e27472bIan Rogers break; 1092b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 11002e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier prev_space = cur_space; 1111d54e73444e017d3a65234e0f193846f3e27472bIan Rogers } 1121d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // If previous space was immune, then extend the immune region. Relies on continuous spaces 1131d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // being sorted by Heap::AddContinuousSpace. 114590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (prev_space != nullptr && IsImmuneSpace(prev_space)) { 1152b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier immune_begin_ = std::min(reinterpret_cast<Object*>(space->Begin()), immune_begin_); 1162b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier immune_end_ = std::max(reinterpret_cast<Object*>(space->End()), immune_end_); 1172b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1182b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1192b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1202b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 121590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartierbool MarkSweep::IsImmuneSpace(const space::ContinuousSpace* space) const { 12211409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier return 12311409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier immune_begin_ <= reinterpret_cast<Object*>(space->Begin()) && 12411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier immune_end_ >= reinterpret_cast<Object*>(space->End()); 12511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier} 12611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier 1272b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::BindBitmaps() { 1284446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("BindBitmaps"); 1292b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 1302b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Mark all of the spaces we never collect as immune. 13194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1321d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyNeverCollect) { 1332b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ImmuneSpace(space); 1342b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1352b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1364446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1372b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1382b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1391d54e73444e017d3a65234e0f193846f3e27472bIan RogersMarkSweep::MarkSweep(Heap* heap, bool is_concurrent, const std::string& name_prefix) 1401d54e73444e017d3a65234e0f193846f3e27472bIan Rogers : GarbageCollector(heap, 141590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier name_prefix + 1421d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (is_concurrent ? "concurrent mark sweep": "mark sweep")), 1431d54e73444e017d3a65234e0f193846f3e27472bIan Rogers current_mark_bitmap_(NULL), 1441d54e73444e017d3a65234e0f193846f3e27472bIan Rogers mark_stack_(NULL), 1451d54e73444e017d3a65234e0f193846f3e27472bIan Rogers immune_begin_(NULL), 1461d54e73444e017d3a65234e0f193846f3e27472bIan Rogers immune_end_(NULL), 147906457c326d505f511fae42fc693cade1656c19eIan Rogers live_stack_freeze_size_(0), 14835883cc623fdf475a4ead1dafcba9e9becc1ed11Mathieu Chartier gc_barrier_(new Barrier(0)), 14962d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers large_object_lock_("mark sweep large object lock", kMarkSweepLargeObjectLock), 150958291c7afe723d846a39539fd00410c102485f3Mathieu Chartier mark_stack_lock_("mark sweep mark stack lock", kMarkSweepMarkStackLock), 151590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier is_concurrent_(is_concurrent) { 1525301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier} 153b3bd5f07884f5a1f2b84224363b1372d7c28d447Elliott Hughes 1542b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::InitializePhase() { 1551d54e73444e017d3a65234e0f193846f3e27472bIan Rogers timings_.Reset(); 1565fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("InitializePhase", &timings_); 157e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier mark_stack_ = heap_->mark_stack_.get(); 158e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier DCHECK(mark_stack_ != nullptr); 159e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier SetImmuneRange(nullptr, nullptr); 1602b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier class_count_ = 0; 1612b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier array_count_ = 0; 1622b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier other_count_ = 0; 1632b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier large_object_test_ = 0; 1642b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier large_object_mark_ = 0; 1652b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier classes_marked_ = 0; 1662b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier overhead_time_ = 0; 1672b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier work_chunks_created_ = 0; 1682b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier work_chunks_deleted_ = 0; 1692b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier reference_count_ = 0; 1704446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum 1717469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier FindDefaultMarkBitmap(); 1724446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum 17394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Do any pre GC verification. 1744654322261c8e4d799acdea60a7e227f33c5c2dbAnwar Ghuloum timings_.NewSplit("PreGcVerification"); 1752b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier heap_->PreGcVerification(this); 1762b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1772b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1782b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ProcessReferences(Thread* self) { 1795fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("ProcessReferences", &timings_); 1808e56c7e41cb37e2eaf553503968a01ff893b135bMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 18139e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier GetHeap()->ProcessReferences(timings_, clear_soft_references_, &IsMarkedCallback, 18239e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier &RecursiveMarkObjectCallback, this); 1832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 1842b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartierbool MarkSweep::HandleDirtyObjectsPhase() { 1865fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("HandleDirtyObjectsPhase", &timings_); 1872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 1882b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(self); 1892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier { 1912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 1922b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Re-mark root set. 1942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ReMarkRoots(); 1952b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Scan dirty objects, this is only required if we are not doing concurrent GC. 19794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkDirtyObjects(true, accounting::CardTable::kCardDirty); 1982b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 1992b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2002b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ProcessReferences(self); 2012b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Only need to do this if we have the card mark verification on, and only during concurrent GC. 2030f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier if (GetHeap()->verify_missing_card_marks_ || GetHeap()->verify_pre_gc_heap_|| 2040f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier GetHeap()->verify_post_gc_heap_) { 2052b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 2062b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // This second sweep makes sure that we don't have any objects in the live stack which point to 2072b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // freed objects. These cause problems since their references may be previously freed objects. 20894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier SweepArray(GetHeap()->allocation_stack_.get(), false); 209f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi // Since SweepArray() above resets the (active) allocation 210f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi // stack. Need to revoke the thread-local allocation stacks that 211f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi // point into it. 212f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi GetHeap()->RevokeAllThreadLocalAllocationStacks(self); 2132b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 2140f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 2150f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier timings_.StartSplit("PreSweepingGcVerification"); 2160f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier heap_->PreSweepingGcVerification(this); 2170f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier timings_.EndSplit(); 2180f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 2190f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier // Ensure that nobody inserted items in the live stack after we swapped the stacks. 2200f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 2210f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier CHECK_GE(live_stack_freeze_size_, GetHeap()->GetLiveStack()->Size()); 222c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier 223c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier // Disallow new system weaks to prevent a race which occurs when someone adds a new system 224c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier // weak before we sweep them. Since this new system weak may not be marked, the GC may 225c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier // incorrectly sweep it. This also fixes a race where interning may attempt to return a strong 226c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier // reference to a string that is about to be swept. 227c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier Runtime::Current()->DisallowNewSystemWeaks(); 2282b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier return true; 2292b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2302b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2312b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartierbool MarkSweep::IsConcurrent() const { 2322b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier return is_concurrent_; 2332b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2342b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2352b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkingPhase() { 2365fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("MarkingPhase", &timings_); 2372b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Thread* self = Thread::Current(); 2382b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2392b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier BindBitmaps(); 2402b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier FindDefaultMarkBitmap(); 2414446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum 2422b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Process dirty cards and add dirty cards to mod union tables. 2430f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier heap_->ProcessCards(timings_); 2442b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2452b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Need to do this before the checkpoint since we don't want any threads to add references to 2462b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // the live stack during the recursive mark. 2474654322261c8e4d799acdea60a7e227f33c5c2dbAnwar Ghuloum timings_.NewSplit("SwapStacks"); 248f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi heap_->SwapStacks(self); 2492b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2502b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 2512b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier if (Locks::mutator_lock_->IsExclusiveHeld(self)) { 2522b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // If we exclusively hold the mutator lock, all threads must be suspended. 2532b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkRoots(); 254f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack) { 255f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi heap_->RevokeAllThreadLocalAllocationStacks(self); 256f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 2572b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } else { 25894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkThreadRoots(self); 2590f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier // At this point the live stack should no longer have any mutators which push into it. 2602b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkNonThreadRoots(); 2612b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 2620f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier live_stack_freeze_size_ = heap_->GetLiveStack()->Size(); 2632b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkConcurrentRoots(); 26411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier UpdateAndMarkModUnion(); 2652b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier MarkReachableObjects(); 2662b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2672b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 26811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartiervoid MarkSweep::UpdateAndMarkModUnion() { 26911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier for (const auto& space : heap_->GetContinuousSpaces()) { 27011409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier if (IsImmuneSpace(space)) { 27111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier const char* name = space->IsZygoteSpace() ? "UpdateAndMarkZygoteModUnionTable" : 27211409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier "UpdateAndMarkImageModUnionTable"; 2735fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split(name, &timings_); 27411409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier accounting::ModUnionTable* mod_union_table = heap_->FindModUnionTableFromSpace(space); 27511409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier CHECK(mod_union_table != nullptr); 27611409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier mod_union_table->UpdateAndMarkReferences(MarkRootCallback, this); 27711409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 27811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier } 27911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier} 28011409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier 28194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::MarkThreadRoots(Thread* self) { 28294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkRootsCheckpoint(self); 28394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier} 28494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 2852b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkReachableObjects() { 2862b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Mark everything allocated since the last as GC live so that we can sweep concurrently, 2872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // knowing that new allocations won't be marked as live. 2884446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkStackAsLive"); 2891d54e73444e017d3a65234e0f193846f3e27472bIan Rogers accounting::ObjectStack* live_stack = heap_->GetLiveStack(); 290590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier heap_->MarkAllocStackAsLive(live_stack); 2912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier live_stack->Reset(); 2924446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 2932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Recursively mark all the non-image bits set in the mark bitmap. 2942b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier RecursiveMark(); 2952b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 2962b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 2972b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::ReclaimPhase() { 2985fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("ReclaimPhase", &timings_); 299720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 3002b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3012b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier if (!IsConcurrent()) { 3022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier ProcessReferences(self); 303c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier } 304c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier 305c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier { 306c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 307c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier SweepSystemWeaks(); 308c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier } 309c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier 310c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier if (IsConcurrent()) { 311c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier Runtime::Current()->AllowNewSystemWeaks(); 312c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier 3135fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("UnMarkAllocStack", &timings_); 3149642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 3150f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier accounting::ObjectStack* allocation_stack = GetHeap()->allocation_stack_.get(); 3169642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // The allocation stack contains things allocated since the start of the GC. These may have been 3179642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // marked during this GC meaning they won't be eligible for reclaiming in the next sticky GC. 3189642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // Remove these objects from the mark bitmaps so that they will be eligible for sticky 3199642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // collection. 3209642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // There is a race here which is safely handled. Another thread such as the hprof could 3219642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // have flushed the alloc stack after we resumed the threads. This is safe however, since 3229642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // reseting the allocation stack zeros it out with madvise. This means that we will either 3239642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // read NULLs or attempt to unmark a newly allocated object which will not be marked in the 3249642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // first place. 3259642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier mirror::Object** end = allocation_stack->End(); 3269642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier for (mirror::Object** it = allocation_stack->Begin(); it != end; ++it) { 32794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const Object* obj = *it; 3289642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier if (obj != NULL) { 3299642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier UnMarkObjectNonNull(obj); 3309642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } 3319642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } 3322b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 3332b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3342b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier { 3352b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 3362b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3372b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Reclaim unmarked objects. 3381d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Sweep(false); 3392b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3402b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Swap the live and mark bitmaps for each space which we modified space. This is an 3412b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // optimization that enables us to not clear live bits inside of the sweep. Only swaps unbound 3422b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // bitmaps. 3434446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("SwapBitmaps"); 3442b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SwapBitmaps(); 3454446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 3462b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3472b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Unbind the live and mark bitmaps. 348a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier TimingLogger::ScopedSplit split("UnBindBitmaps", &timings_); 349a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier GetHeap()->UnBindBitmaps(); 3502b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 3512b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 3522b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 3532b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::SetImmuneRange(Object* begin, Object* end) { 3542b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier immune_begin_ = begin; 3552b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier immune_end_ = end; 3567469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier} 35758551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 3587469ebf3888b8037421cb6834f37f946646265ecMathieu Chartiervoid MarkSweep::FindDefaultMarkBitmap() { 3595fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("FindDefaultMarkBitmap", &timings_); 36002e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 361590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier accounting::SpaceBitmap* bitmap = space->GetMarkBitmap(); 362590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (bitmap != nullptr && 363590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) { 364590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier current_mark_bitmap_ = bitmap; 3657469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier CHECK(current_mark_bitmap_ != NULL); 3667469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier return; 367b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 368b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 3697469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier GetHeap()->DumpSpaces(); 3707469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier LOG(FATAL) << "Could not find a default mark bitmap"; 37158551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 37258551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 373ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartiervoid MarkSweep::ExpandMarkStack() { 374ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier ResizeMarkStack(mark_stack_->Capacity() * 2); 375ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier} 376ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier 377ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartiervoid MarkSweep::ResizeMarkStack(size_t new_size) { 378ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Rare case, no need to have Thread::Current be a parameter. 379ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (UNLIKELY(mark_stack_->Size() < mark_stack_->Capacity())) { 380ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier // Someone else acquired the lock and expanded the mark stack before us. 381ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier return; 382ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 38302e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier std::vector<Object*> temp(mark_stack_->Begin(), mark_stack_->End()); 384ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier CHECK_LE(mark_stack_->Size(), new_size); 385ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier mark_stack_->Resize(new_size); 38602e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& obj : temp) { 38702e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier mark_stack_->PushBack(obj); 388ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 389ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 390ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 3919642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartierinline void MarkSweep::MarkObjectNonNullParallel(const Object* obj) { 392ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier DCHECK(obj != NULL); 393ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier if (MarkObjectParallel(obj)) { 394ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 395ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 396184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier ExpandMarkStack(); 397ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 398ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier // The object must be pushed on to the mark stack. 399ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier mark_stack_->PushBack(const_cast<Object*>(obj)); 400ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier } 401ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 402ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 40339e3261168e7761fea6d873494d7c5d191285791Mathieu Chartiermirror::Object* MarkSweep::RecursiveMarkObjectCallback(mirror::Object* obj, void* arg) { 40439e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier MarkSweep* mark_sweep = reinterpret_cast<MarkSweep*>(arg); 40539e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier mark_sweep->MarkObject(obj); 40639e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier mark_sweep->ProcessMarkStack(true); 40739e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier return obj; 40839e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier} 40939e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier 4109642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartierinline void MarkSweep::UnMarkObjectNonNull(const Object* obj) { 4119642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier DCHECK(!IsImmune(obj)); 4129642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 4139642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier // the hard way. 4149642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier accounting::SpaceBitmap* object_bitmap = current_mark_bitmap_; 4159642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier if (UNLIKELY(!object_bitmap->HasAddress(obj))) { 4169642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier accounting::SpaceBitmap* new_bitmap = heap_->GetMarkBitmap()->GetContinuousSpaceBitmap(obj); 4179642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier if (LIKELY(new_bitmap != NULL)) { 4189642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier object_bitmap = new_bitmap; 4199642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } else { 4209642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier MarkLargeObject(obj, false); 4219642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier return; 4229642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } 4239642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } 4249642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier 4259642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier DCHECK(object_bitmap->HasAddress(obj)); 4269642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier object_bitmap->Clear(obj); 4279642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier} 4289642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier 4299642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartierinline void MarkSweep::MarkObjectNonNull(const Object* obj) { 43069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro DCHECK(obj != NULL); 431b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 4329642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier if (IsImmune(obj)) { 433e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier DCHECK(IsMarked(obj)); 434357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier return; 435357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 436357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 437b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 438b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier // the hard way. 4391d54e73444e017d3a65234e0f193846f3e27472bIan Rogers accounting::SpaceBitmap* object_bitmap = current_mark_bitmap_; 44002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (UNLIKELY(!object_bitmap->HasAddress(obj))) { 4411d54e73444e017d3a65234e0f193846f3e27472bIan Rogers accounting::SpaceBitmap* new_bitmap = heap_->GetMarkBitmap()->GetContinuousSpaceBitmap(obj); 4421d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if (LIKELY(new_bitmap != NULL)) { 44302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier object_bitmap = new_bitmap; 444e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier } else { 4459642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier MarkLargeObject(obj, true); 446e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier return; 447357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 448b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 449b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 45069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro // This object was not previously marked. 45102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (!object_bitmap->Test(obj)) { 45202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier object_bitmap->Set(obj); 453184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier if (UNLIKELY(mark_stack_->Size() >= mark_stack_->Capacity())) { 4540f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier // Lock is not needed but is here anyways to please annotalysis. 4550f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier MutexLock mu(Thread::Current(), mark_stack_lock_); 456184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier ExpandMarkStack(); 45769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 458184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier // The object must be pushed on to the mark stack. 459184e322fe8ddd75c844a1eb2eb1ca32bc02f2d45Mathieu Chartier mark_stack_->PushBack(const_cast<Object*>(obj)); 46069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 46169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 46269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 46302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier// Rare case, probably not worth inlining since it will increase instruction cache miss rate. 4649642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartierbool MarkSweep::MarkLargeObject(const Object* obj, bool set) { 4651d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // TODO: support >1 discontinuous space. 4661d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 467db7f37d57b6ac83abe6815d0cd5c50701b6be821Mathieu Chartier accounting::ObjectSet* large_objects = large_object_space->GetMarkObjects(); 46802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 46902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ++large_object_test_; 47002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 47102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (UNLIKELY(!large_objects->Test(obj))) { 4724fcb8d335cc856380531a42c8c708cc789a77395Mathieu Chartier if (!large_object_space->Contains(obj)) { 47302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier LOG(ERROR) << "Tried to mark " << obj << " not contained by any spaces"; 47402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier LOG(ERROR) << "Attempting see if it's a bad root"; 47502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier VerifyRoots(); 47602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier LOG(FATAL) << "Can't mark bad root"; 47702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 47802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 47902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ++large_object_mark_; 48002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 4819642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier if (set) { 4829642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier large_objects->Set(obj); 4839642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } else { 4849642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier large_objects->Clear(obj); 4859642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier } 48602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return true; 48702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 48802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 48902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 49002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 49102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierinline bool MarkSweep::MarkObjectParallel(const Object* obj) { 49202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier DCHECK(obj != NULL); 49302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 4949642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier if (IsImmune(obj)) { 49502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier DCHECK(IsMarked(obj)); 49602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return false; 49702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 49802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 49902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Try to take advantage of locality of references within a space, failing this find the space 50002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // the hard way. 5011d54e73444e017d3a65234e0f193846f3e27472bIan Rogers accounting::SpaceBitmap* object_bitmap = current_mark_bitmap_; 50202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (UNLIKELY(!object_bitmap->HasAddress(obj))) { 5031d54e73444e017d3a65234e0f193846f3e27472bIan Rogers accounting::SpaceBitmap* new_bitmap = heap_->GetMarkBitmap()->GetContinuousSpaceBitmap(obj); 50402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (new_bitmap != NULL) { 50502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier object_bitmap = new_bitmap; 50602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } else { 50702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // TODO: Remove the Thread::Current here? 50802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // TODO: Convert this to some kind of atomic marking? 50902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MutexLock mu(Thread::Current(), large_object_lock_); 5109642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier return MarkLargeObject(obj, true); 51102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 51202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 51302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 51402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Return true if the object was not previously marked. 51502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier return !object_bitmap->AtomicTestAndSet(obj); 51602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 51702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 51869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Used to mark objects when recursing. Recursion is done by moving 51969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// the finger across the bitmaps in address order and marking child 52069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// objects. Any newly-marked objects whose addresses are lower than 52169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// the finger won't be visited by the bitmap scan, so those objects 52269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// need to be added to the mark stack. 52394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierinline void MarkSweep::MarkObject(const Object* obj) { 52469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro if (obj != NULL) { 5259642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier MarkObjectNonNull(obj); 52669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro } 52769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 52869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 5292b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::MarkRoot(const Object* obj) { 5302b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier if (obj != NULL) { 5319642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier MarkObjectNonNull(obj); 5322b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 5332b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier} 5342b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 53583c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartiermirror::Object* MarkSweep::MarkRootParallelCallback(mirror::Object* root, void* arg, 53683c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartier uint32_t /*thread_id*/, RootType /*root_type*/) { 537ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier DCHECK(root != NULL); 538ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier DCHECK(arg != NULL); 539ba311b4385fa3f382f01312a8cc97b52011232e3Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObjectNonNullParallel(root); 540423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier return root; 541ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier} 542ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier 54383c8ee000d525017ead8753fce6bc1020249b96aMathieu ChartierObject* MarkSweep::MarkRootCallback(Object* root, void* arg, uint32_t /*thread_id*/, 54483c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartier RootType /*root_type*/) { 545423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier DCHECK(root != nullptr); 546423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier DCHECK(arg != nullptr); 547423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier reinterpret_cast<MarkSweep*>(arg)->MarkObjectNonNull(root); 548423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier return root; 549262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier} 550262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 5516f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRootCallback(const Object* root, void* arg, size_t vreg, 55240e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogers const StackVisitor* visitor) { 55340e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogers reinterpret_cast<MarkSweep*>(arg)->VerifyRoot(root, vreg, visitor); 5546f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5556f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 55640e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogersvoid MarkSweep::VerifyRoot(const Object* root, size_t vreg, const StackVisitor* visitor) { 5576f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier // See if the root is on any space bitmap. 5581d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if (GetHeap()->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == NULL) { 5591d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 5604202b7484dab71ca4dfc2109ebb3fd04b87badfbMathieu Chartier if (!large_object_space->Contains(root)) { 5616f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier LOG(ERROR) << "Found invalid root: " << root; 56240e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogers if (visitor != NULL) { 56340e3bacfd57bca2ca39c1caec64680bd0ed4a16dIan Rogers LOG(ERROR) << visitor->DescribeLocation() << " in VReg: " << vreg; 5646f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5656f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5666f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier } 5676f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5686f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 5696f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartiervoid MarkSweep::VerifyRoots() { 5706f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier Runtime::Current()->GetThreadList()->VerifyRoots(VerifyRootCallback, this); 5716f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier} 5726f1c94968ada57da433debf8e2d1b38a80ceb510Mathieu Chartier 57369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Marks all objects in the root set. 57469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapirovoid MarkSweep::MarkRoots() { 5754446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkRoots"); 576423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier Runtime::Current()->VisitNonConcurrentRoots(MarkRootCallback, this); 5774446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 5789ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier} 5799ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartier 580858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartiervoid MarkSweep::MarkNonThreadRoots() { 5814446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkNonThreadRoots"); 582423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier Runtime::Current()->VisitNonThreadRoots(MarkRootCallback, this); 5834446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 584858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 585858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 5869ebae1f30b84dfd8dab4144f80eebec4f8fc8851Mathieu Chartiervoid MarkSweep::MarkConcurrentRoots() { 5874446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkConcurrentRoots"); 5881d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Visit all runtime roots and clear dirty flags. 589423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier Runtime::Current()->VisitConcurrentRoots(MarkRootCallback, this, false, true); 5904446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 59169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 59269759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 59302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass ScanObjectVisitor { 594cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier public: 59594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE 59694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep) {} 597cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 5982b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // TODO: Fixme when anotatalysis works with visitors. 599590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier void operator()(Object* obj) const ALWAYS_INLINE NO_THREAD_SAFETY_ANALYSIS { 60094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 6012b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 6022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 6032b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 60402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_sweep_->ScanObject(obj); 605cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 606cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 607cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier private: 608cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier MarkSweep* const mark_sweep_; 609cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 610cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 61194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiertemplate <bool kUseFinger = false> 61294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass MarkStackTask : public Task { 61394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 61494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, size_t mark_stack_size, 61594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const Object** mark_stack) 61694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : mark_sweep_(mark_sweep), 61794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_(thread_pool), 61894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_(mark_stack_size) { 61994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We may have to copy part of an existing mark stack when another mark stack overflows. 62094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_size != 0) { 62194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(mark_stack != NULL); 62294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Check performance? 62394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier std::copy(mark_stack, mark_stack + mark_stack_size, mark_stack_); 62494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 62594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 62694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_created_; 6271d54e73444e017d3a65234e0f193846f3e27472bIan Rogers } 628262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier } 629262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 63094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kMaxSize = 1 * KB; 631cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 63294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 63394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier class ScanObjectParallelVisitor { 63494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 63594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit ScanObjectParallelVisitor(MarkStackTask<kUseFinger>* chunk_task) ALWAYS_INLINE 63694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : chunk_task_(chunk_task) {} 63794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 63811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier void operator()(Object* obj) const { 63994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkSweep* mark_sweep = chunk_task_->mark_sweep_; 64094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_sweep->ScanObjectVisit(obj, 64111409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier [mark_sweep, this](Object* /* obj */, Object* ref, const MemberOffset& /* offset */, 642460536209b741bc469f1b0857775449abb2102fbBernhard Rosenkränzer bool /* is_static */) ALWAYS_INLINE_LAMBDA { 64394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (ref != nullptr && mark_sweep->MarkObjectParallel(ref)) { 64494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseFinger) { 64594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier android_memory_barrier(); 64694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (reinterpret_cast<uintptr_t>(ref) >= 64794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static_cast<uintptr_t>(mark_sweep->atomic_finger_)) { 64894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier return; 64994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 65094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 65194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier chunk_task_->MarkStackPush(ref); 65294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 65394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier }); 65494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 65594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 65694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier private: 65794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask<kUseFinger>* const chunk_task_; 65894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier }; 65994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 66094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual ~MarkStackTask() { 66194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Make sure that we have cleared our mark stack. 66294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_EQ(mark_stack_pos_, 0U); 66394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCountTasks) { 66494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ++mark_sweep_->work_chunks_deleted_; 6652b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 666cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 667cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 66894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkSweep* const mark_sweep_; 66994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* const thread_pool_; 67094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Thread local mark stack for this task. 67194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const Object* mark_stack_[kMaxSize]; 67294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack position. 67394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_pos_; 67494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 67594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier void MarkStackPush(const Object* obj) ALWAYS_INLINE { 67694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == kMaxSize)) { 67794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Mark stack overflow, give 1/2 the stack to the thread pool as a new work task. 67894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_pos_ /= 2; 67994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new MarkStackTask(thread_pool_, mark_sweep_, kMaxSize - mark_stack_pos_, 68094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_ + mark_stack_pos_); 68194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool_->AddTask(Thread::Current(), task); 68294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 68394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != nullptr); 68494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(mark_stack_pos_ < kMaxSize); 68594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_[mark_stack_pos_++] = obj; 68694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 68794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 68894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 68994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 69094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 69194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 69294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 69394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) { 69494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 69594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 69694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 69794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier BoundedFifoPowerOfTwo<const Object*, kFifoSize> prefetch_fifo; 69894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (;;) { 69911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier const Object* obj = nullptr; 70094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 70194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (mark_stack_pos_ != 0 && prefetch_fifo.size() < kFifoSize) { 70294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const Object* obj = mark_stack_[--mark_stack_pos_]; 70311409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 70494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier __builtin_prefetch(obj); 70594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.push_back(obj); 70694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 70794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(prefetch_fifo.empty())) { 70894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 70994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 71094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 71194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 71294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 71394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (UNLIKELY(mark_stack_pos_ == 0)) { 71494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 71594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 71694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_[--mark_stack_pos_]; 71794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 71811409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier DCHECK(obj != nullptr); 71911409ae81a3eaf84d7fd2b3c85b8b06d2bae27f0Mathieu Chartier visitor(const_cast<mirror::Object*>(obj)); 72094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 72194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 72294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 72394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 72494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass CardScanTask : public MarkStackTask<false> { 72594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 72694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier CardScanTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, accounting::SpaceBitmap* bitmap, 72794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* begin, byte* end, byte minimum_age, size_t mark_stack_size, 72894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const Object** mark_stack_obj) 72994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, mark_stack_size, mark_stack_obj), 73094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 73194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 73294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end), 73394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier minimum_age_(minimum_age) { 73494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 73594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 73694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 73794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::SpaceBitmap* const bitmap_; 73894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* const begin_; 73994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* const end_; 74094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const byte minimum_age_; 74194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 74294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 74394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 74494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 74594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 74694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 74794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 74894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = mark_sweep_->GetHeap()->GetCardTable(); 7490f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier size_t cards_scanned = card_table->Scan(bitmap_, begin_, end_, visitor, minimum_age_); 7500f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier VLOG(heap) << "Parallel scanning cards " << reinterpret_cast<void*>(begin_) << " - " 7510f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier << reinterpret_cast<void*>(end_) << " = " << cards_scanned; 75294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 75394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 75494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 755cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier}; 756cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 7572775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiersize_t MarkSweep::GetThreadCount(bool paused) const { 7582775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (heap_->GetThreadPool() == nullptr || !heap_->CareAboutPauseTimes()) { 7592775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier return 0; 7602775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 7612775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (paused) { 7622775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier return heap_->GetParallelGCThreadCount() + 1; 7632775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } else { 7642775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier return heap_->GetConcGCThreadCount() + 1; 7652775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier } 7662775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier} 7672775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier 76894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ScanGrayObjects(bool paused, byte minimum_age) { 76994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable* card_table = GetHeap()->GetCardTable(); 77094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 7712775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 7722775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier // The parallel version with only one thread is faster for card scanning, TODO: fix. 7732775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelCardScan && thread_count > 0) { 774720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier Thread* self = Thread::Current(); 77594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Can't have a different split for each space since multiple spaces can have their cards being 77694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // scanned at the same time. 77794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayObjects" : "ScanGrayObjects"); 77894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Try to take some of the mark stack since we can pass this off to the worker tasks. 77994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const Object** mark_stack_begin = const_cast<const Object**>(mark_stack_->Begin()); 78094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const Object** mark_stack_end = const_cast<const Object**>(mark_stack_->End()); 781720ef7680573c1afd12f99f02eee3045daee5168Mathieu Chartier const size_t mark_stack_size = mark_stack_end - mark_stack_begin; 78294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Estimated number of work tasks we will create. 78394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_tasks = GetHeap()->GetContinuousSpaces().size() * thread_count; 78494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_NE(mark_stack_tasks, 0U); 78594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t mark_stack_delta = std::min(CardScanTask::kMaxSize / 2, 78694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_size / mark_stack_tasks + 1); 78794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 788590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() == nullptr) { 789590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 790590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 79194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* card_begin = space->Begin(); 79294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier byte* card_end = space->End(); 7930941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Align up the end address. For example, the image space's end 7940941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // may not be card-size-aligned. 7950941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi card_end = AlignUp(card_end, accounting::CardTable::kCardSize); 7960941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi DCHECK(IsAligned<accounting::CardTable::kCardSize>(card_begin)); 7970941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi DCHECK(IsAligned<accounting::CardTable::kCardSize>(card_end)); 79894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how many bytes of heap we will scan, 79994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t address_range = card_end - card_begin; 80094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Calculate how much address range each task gets. 80194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t card_delta = RoundUp(address_range / thread_count + 1, 80294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::CardTable::kCardSize); 80394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create the worker tasks for this space. 80494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (card_begin != card_end) { 80594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add a range of cards. 80694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t addr_remaining = card_end - card_begin; 80794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t card_increment = std::min(card_delta, addr_remaining); 80894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Take from the back of the mark stack. 80994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_remaining = mark_stack_end - mark_stack_begin; 81094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining); 81194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_end -= mark_stack_increment; 81294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment)); 81394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK_EQ(mark_stack_end, mark_stack_->End()); 81494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Add the new task to the thread pool. 81594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new CardScanTask(thread_pool, this, space->GetMarkBitmap(), card_begin, 81694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin + card_increment, minimum_age, 81794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_increment, mark_stack_end); 81894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 81994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier card_begin += card_increment; 82094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 82194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 8220f72e4136aecaf6976fdb55916bbd7b6d5c9c77bMathieu Chartier 8230941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // Note: the card scan below may dirty new cards (and scan them) 8240941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // as a side effect when a Reference object is encountered and 8250941b0423537a6a5d7c1df6dd23e9864ea8f319cHiroshi Yamauchi // queued during the marking. See b/11465268. 8262775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 82794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 8282775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 82994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 83094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.EndSplit(); 83194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 83294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 833590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (space->GetMarkBitmap() != nullptr) { 834590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Image spaces are handled properly since live == marked for them. 835590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier switch (space->GetGcRetentionPolicy()) { 836590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyNeverCollect: 837590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayImageSpaceObjects" : 838590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayImageSpaceObjects"); 839590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 840590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyFullCollect: 841590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayZygoteSpaceObjects" : 842590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayZygoteSpaceObjects"); 843590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 844590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case space::kGcRetentionPolicyAlwaysCollect: 845590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.StartSplit(paused ? "(Paused)ScanGrayAllocSpaceObjects" : 846590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier "ScanGrayAllocSpaceObjects"); 847590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier break; 848590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 849590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier ScanObjectVisitor visitor(this); 850590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier card_table->Scan(space->GetMarkBitmap(), space->Begin(), space->End(), visitor, minimum_age); 851590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier timings_.EndSplit(); 852590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 85394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 85494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 85594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier} 85694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 85794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartierclass RecursiveMarkTask : public MarkStackTask<false> { 85894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier public: 85994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier RecursiveMarkTask(ThreadPool* thread_pool, MarkSweep* mark_sweep, 86094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::SpaceBitmap* bitmap, uintptr_t begin, uintptr_t end) 86194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier : MarkStackTask<false>(thread_pool, mark_sweep, 0, NULL), 86294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_(bitmap), 86394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin_(begin), 86494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier end_(end) { 86594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 86694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 86794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier protected: 86894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier accounting::SpaceBitmap* const bitmap_; 86994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t begin_; 87094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const uintptr_t end_; 87194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 87294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Finalize() { 87394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delete this; 87494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 87594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 87694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Scans all of the objects 87794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier virtual void Run(Thread* self) NO_THREAD_SAFETY_ANALYSIS { 87894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectParallelVisitor visitor(this); 87994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bitmap_->VisitMarkedRange(begin_, end_, visitor); 88094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Finish by emptying our local mark stack. 88194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier MarkStackTask::Run(self); 88294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 88394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier}; 88494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 88558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// Populates the mark stack based on the set of marked objects and 88658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro// recursively marks until the mark stack is emptied. 8872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::RecursiveMark() { 8885fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("RecursiveMark", &timings_); 889a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // RecursiveMark will build the lists of known instances of the Reference classes. See 890a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier // DelayReferenceReferent for details. 89194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseRecursiveMark) { 89294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const bool partial = GetGcType() == kGcTypePartial; 89394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanObjectVisitor scan_visitor(this); 89494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* self = Thread::Current(); 89594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ThreadPool* thread_pool = heap_->GetThreadPool(); 8962775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(false); 8972775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const bool parallel = kParallelRecursiveMark && thread_count > 1; 89894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier mark_stack_->Reset(); 89902e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 9001d54e73444e017d3a65234e0f193846f3e27472bIan Rogers if ((space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) || 9011d54e73444e017d3a65234e0f193846f3e27472bIan Rogers (!partial && space->GetGcRetentionPolicy() == space::kGcRetentionPolicyFullCollect)) { 9022b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier current_mark_bitmap_ = space->GetMarkBitmap(); 903590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (current_mark_bitmap_ == nullptr) { 904590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier continue; 9052b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 90694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (parallel) { 90794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // We will use the mark stack the future. 90894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // CHECK(mark_stack_->IsEmpty()); 90994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 91094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 91194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 91294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier atomic_finger_ = static_cast<int32_t>(0xFFFFFFFF); 91394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier 91494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Create a few worker tasks. 9152775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t n = thread_count * 2; 91694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (begin != end) { 91794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t start = begin; 91894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t delta = (end - begin) / n; 91994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier delta = RoundUp(delta, KB); 92094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (delta < 16 * KB) delta = end - begin; 92194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin += delta; 92294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier auto* task = new RecursiveMarkTask(thread_pool, this, current_mark_bitmap_, start, 92394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier begin); 92494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, task); 92594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 9262775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 92794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StartWorkers(self); 9282775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 92994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 93094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 93194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // This function does not handle heap end increasing, so we must use the space end. 93294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t begin = reinterpret_cast<uintptr_t>(space->Begin()); 93394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier uintptr_t end = reinterpret_cast<uintptr_t>(space->End()); 93494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier current_mark_bitmap_->VisitMarkedRange(begin, end, scan_visitor); 93594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 936357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 937357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 938357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 93994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(false); 94058551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 94158551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 94283c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartiermirror::Object* MarkSweep::IsMarkedCallback(mirror::Object* object, void* arg) { 9435712d5d04640925970db9c98938ffaf806b3962cMathieu Chartier if (reinterpret_cast<MarkSweep*>(arg)->IsMarked(object)) { 9446aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return object; 9456aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier } 9466aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return nullptr; 947357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 948357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 94994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::RecursiveMarkDirtyObjects(bool paused, byte minimum_age) { 95094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ScanGrayObjects(paused, minimum_age); 95194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier ProcessMarkStack(paused); 952262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier} 953262e5ffa1d4b23f23af3dea762a71a0af4bfd4a9Mathieu Chartier 95458551df3c2646ed507feec9e9eb3768085a76059Carl Shapirovoid MarkSweep::ReMarkRoots() { 9554446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("ReMarkRoots"); 956423d2a3dcbb260b020efb5da59f784c9f02accbfMathieu Chartier Runtime::Current()->VisitRoots(MarkRootCallback, this, true, true); 9574446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 95858551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 95958551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 9607469ebf3888b8037421cb6834f37f946646265ecMathieu Chartiervoid MarkSweep::SweepSystemWeaks() { 9617469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier Runtime* runtime = Runtime::Current(); 9624446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("SweepSystemWeaks"); 96339e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier runtime->SweepSystemWeaks(IsMarkedCallback, this); 9644446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 96569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 96669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 9676aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartiermirror::Object* MarkSweep::VerifySystemWeakIsLiveCallback(Object* obj, void* arg) { 968c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier reinterpret_cast<MarkSweep*>(arg)->VerifyIsLive(obj); 969c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier // We don't actually want to sweep the object, so lets return "marked" 9706aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier return obj; 971c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 972c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 973c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifyIsLive(const Object* obj) { 974c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier Heap* heap = GetHeap(); 975c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier if (!heap->GetLiveBitmap()->Test(obj)) { 9761d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 9777469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier if (!large_object_space->GetLiveObjects()->Test(obj)) { 9787469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier if (std::find(heap->allocation_stack_->Begin(), heap->allocation_stack_->End(), obj) == 9797469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier heap->allocation_stack_->End()) { 9807469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier // Object not found! 9817469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier heap->DumpSpaces(); 9827469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier LOG(FATAL) << "Found dead object " << obj; 9837469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 984c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 985c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier } 986c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 987c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 988c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartiervoid MarkSweep::VerifySystemWeaks() { 9896aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier // Verify system weaks, uses a special object visitor which returns the input object. 9906aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier Runtime::Current()->SweepSystemWeaks(VerifySystemWeakIsLiveCallback, this); 991c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier} 992c7b83a0d8ac73bdfff751619ae2a34948e3534b7Mathieu Chartier 9930e4627e593bc39f8e3d89c31f8977d55054c07ccMathieu Chartierclass CheckpointMarkThreadRoots : public Closure { 994858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier public: 99593ba893c20532990a430741e0a97212900094e8cBrian Carlstrom explicit CheckpointMarkThreadRoots(MarkSweep* mark_sweep) : mark_sweep_(mark_sweep) {} 996858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 997858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier virtual void Run(Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 9983f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_BEGIN("Marking thread roots"); 999858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier // Note: self is not necessarily equal to thread since thread may be suspended. 1000858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier Thread* self = Thread::Current(); 1001d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier CHECK(thread == self || thread->IsSuspended() || thread->GetState() == kWaitingPerformingGc) 1002d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << thread->GetState() << " thread " << thread << " self " << self; 1003ac86a7cad60c20a131011338057887bb64cbfd38Mathieu Chartier thread->VisitRoots(MarkSweep::MarkRootParallelCallback, mark_sweep_); 10043f9667022788ba1effcd1e47fc9e3decc4db569dMathieu Chartier ATRACE_END(); 1005f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack) { 1006f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi thread->RevokeThreadLocalAllocationStack(); 1007f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1008858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier mark_sweep_->GetBarrier().Pass(self); 1009858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier } 1010858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 1011858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier private: 1012858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier MarkSweep* mark_sweep_; 1013858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier}; 1014858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 10151d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::MarkRootsCheckpoint(Thread* self) { 1016d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier CheckpointMarkThreadRoots check_point(this); 10174446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("MarkRootsCheckpoint"); 1018858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 10191d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Request the check point is run on all threads returning a count of the threads that must 10201d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // run through the barrier including self. 10211d54e73444e017d3a65234e0f193846f3e27472bIan Rogers size_t barrier_count = thread_list->RunCheckpoint(&check_point); 10221d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Release locks then wait for all mutator threads to pass the barrier. 10231d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // TODO: optimize to not release locks when there are no threads to wait for. 10241d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveUnlock(self); 10251d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedUnlock(self); 10261d54e73444e017d3a65234e0f193846f3e27472bIan Rogers ThreadState old_state = self->SetState(kWaitingForCheckPointsToRun); 10271d54e73444e017d3a65234e0f193846f3e27472bIan Rogers CHECK_EQ(old_state, kWaitingPerformingGc); 10281d54e73444e017d3a65234e0f193846f3e27472bIan Rogers gc_barrier_->Increment(self, barrier_count); 10291d54e73444e017d3a65234e0f193846f3e27472bIan Rogers self->SetState(kWaitingPerformingGc); 10301d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::mutator_lock_->SharedLock(self); 10311d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Locks::heap_bitmap_lock_->ExclusiveLock(self); 10324446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1033858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier} 1034858f1c5fd5e528d0b16040ced74d4636046a42d8Mathieu Chartier 10351d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::SweepArray(accounting::ObjectStack* allocations, bool swap_bitmaps) { 103694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier timings_.StartSplit("SweepArray"); 1037e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Thread* self = Thread::Current(); 1038e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier mirror::Object* chunk_free_buffer[kSweepArrayChunkFreeSize]; 1039e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t chunk_free_pos = 0; 1040e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_bytes = 0; 1041e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_large_object_bytes = 0; 1042e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_objects = 0; 1043e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t freed_large_objects = 0; 1044e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // How many objects are left in the array, modified after each space is swept. 1045e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Object** objects = const_cast<Object**>(allocations->Begin()); 1046e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier size_t count = allocations->Size(); 1047e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Change the order to ensure that the non-moving space last swept as an optimization. 1048e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::vector<space::ContinuousSpace*> sweep_spaces; 1049e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::ContinuousSpace* non_moving_space = nullptr; 1050e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : heap_->GetContinuousSpaces()) { 1051e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space->IsAllocSpace() && !IsImmuneSpace(space) && space->GetLiveBitmap() != nullptr) { 1052e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space == heap_->GetNonMovingSpace()) { 1053e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier non_moving_space = space; 1054e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1055e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(space); 1056e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1057e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1058e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1059e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Unlikely to sweep a significant amount of non_movable objects, so we do these after the after 1060e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the other alloc spaces as an optimization. 1061e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (non_moving_space != nullptr) { 1062e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier sweep_spaces.push_back(non_moving_space); 1063e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1064e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Start by sweeping the continuous spaces. 1065e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (space::ContinuousSpace* space : sweep_spaces) { 1066e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier space::AllocSpace* alloc_space = space->AsAllocSpace(); 1067e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier accounting::SpaceBitmap* live_bitmap = space->GetLiveBitmap(); 1068e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier accounting::SpaceBitmap* mark_bitmap = space->GetMarkBitmap(); 1069e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (swap_bitmaps) { 1070e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier std::swap(live_bitmap, mark_bitmap); 1071e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1072e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Object** out = objects; 1073e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier for (size_t i = 0; i < count; ++i) { 1074e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier Object* obj = objects[i]; 1075f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1076f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1077f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1078e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (space->HasAddress(obj)) { 1079e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // This object is in the space, remove it from the array and add it to the sweep buffer 1080e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // if needed. 1081e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!mark_bitmap->Test(obj)) { 1082e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos >= kSweepArrayChunkFreeSize) { 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 chunk_free_buffer[chunk_free_pos++] = obj; 1090e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1091e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } else { 1092e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier *(out++) = obj; 1093e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1094e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1095e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (chunk_free_pos > 0) { 1096e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.StartSplit("FreeList"); 1097e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_objects += chunk_free_pos; 1098e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier freed_bytes += alloc_space->FreeList(self, chunk_free_pos, chunk_free_buffer); 1099e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier timings_.EndSplit(); 1100e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier chunk_free_pos = 0; 1101e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1102e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // All of the references which space contained are no longer in the allocation stack, update 1103e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // the count. 1104e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier count = out - objects; 1105e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier } 1106e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle the large object space. 11071d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace(); 1108db7f37d57b6ac83abe6815d0cd5c50701b6be821Mathieu Chartier accounting::ObjectSet* large_live_objects = large_object_space->GetLiveObjects(); 1109db7f37d57b6ac83abe6815d0cd5c50701b6be821Mathieu Chartier accounting::ObjectSet* large_mark_objects = large_object_space->GetMarkObjects(); 1110357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier if (swap_bitmaps) { 1111e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier std::swap(large_live_objects, large_mark_objects); 1112357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 111302c8cc6d1312a2b55533f02f6369dc7c94672f90Brian Carlstrom for (size_t i = 0; i < count; ++i) { 1114357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier Object* obj = objects[i]; 1115e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier // Handle large objects. 1116f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi if (kUseThreadLocalAllocationStack && obj == nullptr) { 1117f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi continue; 1118f5b0e20b5b31f5f5465784adcf2a204dcd69c7fdHiroshi Yamauchi } 1119e6da9af8dfe0a3e3fbc2be700554f6478380e7b9Mathieu Chartier if (!large_mark_objects->Test(obj)) { 1120e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier ++freed_large_objects; 1121e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier freed_large_object_bytes += large_object_space->Free(self, obj); 1122357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1123357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 11244446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1125357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 1126b22a451675c29ac3fc82a8761d2a385a170d6d7fHiroshi Yamauchi timings_.StartSplit("RecordFree"); 112740e978b0bb5e0011a69d7d1fb83a3e59f2df4f84Mathieu Chartier VLOG(heap) << "Freed " << freed_objects << "/" << count 1128e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier << " objects with size " << PrettySize(freed_bytes); 1129e53225c7b8c98f8fc3855fc70f718e7f8abab307Mathieu Chartier heap_->RecordFree(freed_objects + freed_large_objects, freed_bytes + freed_large_object_bytes); 1130b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_objects_.FetchAndAdd(freed_objects); 1131b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_large_objects_.FetchAndAdd(freed_large_objects); 1132b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_bytes_.FetchAndAdd(freed_bytes); 1133b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_large_object_bytes_.FetchAndAdd(freed_large_object_bytes); 11344446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 11351d54e73444e017d3a65234e0f193846f3e27472bIan Rogers 11364446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("ResetStack"); 1137357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier allocations->Reset(); 11384446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 1139357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 1140357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 11411d54e73444e017d3a65234e0f193846f3e27472bIan Rogersvoid MarkSweep::Sweep(bool swap_bitmaps) { 1142b43b7d42b0c497333564e76be953157066c2b995Mathieu Chartier DCHECK(mark_stack_->IsEmpty()); 11435fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit("Sweep", &timings_); 114402e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1145a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier if (space->IsContinuousMemMapAllocSpace()) { 1146a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); 1147ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier TimingLogger::ScopedSplit split( 1148a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier alloc_space->IsZygoteSpace() ? "SweepZygoteSpace" : "SweepMallocSpace", &timings_); 1149ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier size_t freed_objects = 0; 1150ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier size_t freed_bytes = 0; 1151a1602f28c0e3127ad511712d4b08db89737ae901Mathieu Chartier alloc_space->Sweep(swap_bitmaps, &freed_objects, &freed_bytes); 1152ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier heap_->RecordFree(freed_objects, freed_bytes); 1153ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier freed_objects_.FetchAndAdd(freed_objects); 1154ec05007f8619f8b0cc868d06731e07f84bb74c5bMathieu Chartier freed_bytes_.FetchAndAdd(freed_bytes); 115558551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 115658551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro } 11572b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier SweepLargeObjects(swap_bitmaps); 115858551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro} 115958551df3c2646ed507feec9e9eb3768085a76059Carl Shapiro 1160e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartiervoid MarkSweep::SweepLargeObjects(bool swap_bitmaps) { 11615fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit("SweepLargeObjects", &timings_); 1162e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier size_t freed_objects = 0; 11632fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier size_t freed_bytes = 0; 1164db7f37d57b6ac83abe6815d0cd5c50701b6be821Mathieu Chartier GetHeap()->GetLargeObjectsSpace()->Sweep(swap_bitmaps, &freed_objects, &freed_bytes); 1165b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_large_objects_.FetchAndAdd(freed_objects); 1166b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers freed_large_object_bytes_.FetchAndAdd(freed_bytes); 11672fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier GetHeap()->RecordFree(freed_objects, freed_bytes); 1168e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier} 1169e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier 117069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Process the "referent" field in a java.lang.ref.Reference. If the 117169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// referent has not yet been marked, put it on the appropriate list in 117294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier// the heap for later processing. 117394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::DelayReferenceReferent(mirror::Class* klass, Object* obj) { 117494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(klass != nullptr); 11750cfe1fb7060576d047f7f894fc0d8b87de84fcabIan Rogers DCHECK(klass->IsReferenceClass()); 117694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != NULL); 117739e3261168e7761fea6d873494d7c5d191285791Mathieu Chartier heap_->DelayReferenceReferent(klass, obj, IsMarkedCallback, this); 117869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 117969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 118002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartierclass MarkObjectVisitor { 118102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier public: 118294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier explicit MarkObjectVisitor(MarkSweep* const mark_sweep) ALWAYS_INLINE : mark_sweep_(mark_sweep) {} 118302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 11842b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // TODO: Fixme when anotatalysis works with visitors. 1185df62950e7a32031b82360c407d46a37b94188fbbBrian Carlstrom void operator()(const Object* /* obj */, const Object* ref, const MemberOffset& /* offset */, 118694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier bool /* is_static */) const ALWAYS_INLINE 11872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier NO_THREAD_SAFETY_ANALYSIS { 118894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kCheckLocks) { 11892b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::mutator_lock_->AssertSharedHeld(Thread::Current()); 11902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier Locks::heap_bitmap_lock_->AssertExclusiveHeld(Thread::Current()); 11912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier } 119202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_sweep_->MarkObject(ref); 119302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 119402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 119502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier private: 119602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MarkSweep* const mark_sweep_; 119702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier}; 119802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 119969759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// Scans an object reference. Determines the type of the reference 120069759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro// and dispatches to a specialized scanning routine. 1201590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartiervoid MarkSweep::ScanObject(Object* obj) { 120202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier MarkObjectVisitor visitor(this); 1203590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier ScanObjectVisit(obj, visitor); 120402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier} 120502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 12062775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartiervoid MarkSweep::ProcessMarkStackParallel(size_t thread_count) { 120702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier Thread* self = Thread::Current(); 120802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier ThreadPool* thread_pool = GetHeap()->GetThreadPool(); 12092775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier const size_t chunk_size = std::min(mark_stack_->Size() / thread_count + 1, 12102775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier static_cast<size_t>(MarkStackTask<false>::kMaxSize)); 121194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier CHECK_GT(chunk_size, 0U); 121294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // Split the current mark stack up into work tasks. 121394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier for (mirror::Object **it = mark_stack_->Begin(), **end = mark_stack_->End(); it < end; ) { 121494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const size_t delta = std::min(static_cast<size_t>(end - it), chunk_size); 121594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->AddTask(self, new MarkStackTask<false>(thread_pool, this, delta, 121694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier const_cast<const mirror::Object**>(it))); 121794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier it += delta; 121802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 12192775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->SetMaxActiveWorkers(thread_count - 1); 122002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier thread_pool->StartWorkers(self); 12212775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier thread_pool->Wait(self, true, true); 122294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier thread_pool->StopWorkers(self); 122302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier mark_stack_->Reset(); 122402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier CHECK_EQ(work_chunks_created_, work_chunks_deleted_) << " some of the work chunks were leaked"; 122569759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 122669759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 12275d76c435082332ef79a22962386fa92a0870e378Ian Rogers// Scan anything that's on the mark stack. 122894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartiervoid MarkSweep::ProcessMarkStack(bool paused) { 12294446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.StartSplit("ProcessMarkStack"); 12302775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier size_t thread_count = GetThreadCount(paused); 12312775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier if (kParallelProcessMarkStack && thread_count > 1 && 12322775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier mark_stack_->Size() >= kMinimumParallelMarkStackSize) { 12332775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier ProcessMarkStackParallel(thread_count); 123494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 123594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier // TODO: Tune this. 123694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier static const size_t kFifoSize = 4; 1237590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier BoundedFifoPowerOfTwo<Object*, kFifoSize> prefetch_fifo; 1238d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier for (;;) { 1239590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Object* obj = NULL; 124094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (kUseMarkStackPrefetch) { 124194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier while (!mark_stack_->IsEmpty() && prefetch_fifo.size() < kFifoSize) { 1242590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Object* obj = mark_stack_->PopBack(); 124394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier DCHECK(obj != NULL); 124494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier __builtin_prefetch(obj); 124594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.push_back(obj); 124694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 124794c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (prefetch_fifo.empty()) { 124894c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 124994c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 125094c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = prefetch_fifo.front(); 125194c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier prefetch_fifo.pop_front(); 125294c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } else { 125394c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier if (mark_stack_->IsEmpty()) { 125494c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier break; 125594c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier } 125694c32c5f01c7d44781317bf23933ed0a5bc4b796Mathieu Chartier obj = mark_stack_->PopBack(); 1257d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier } 1258d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier DCHECK(obj != NULL); 1259d8195f19840911a73b1491dfc8e7c18139753731Mathieu Chartier ScanObject(obj); 1260357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 1261357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } 12624446ab9e70dde779d97f451c4904f6b8770232bdAnwar Ghuloum timings_.EndSplit(); 126369759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 126469759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 12657469ebf3888b8037421cb6834f37f946646265ecMathieu Chartierinline bool MarkSweep::IsMarked(const Object* object) const 12667469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 12679642c96bd5a1ccc4e221de9c0af4a545af8182d2Mathieu Chartier if (IsImmune(object)) { 12687469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier return true; 12697469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 12707469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier DCHECK(current_mark_bitmap_ != NULL); 12717469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier if (current_mark_bitmap_->HasAddress(object)) { 12727469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier return current_mark_bitmap_->Test(object); 12737469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier } 12747469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier return heap_->GetMarkBitmap()->Test(object); 12757469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier} 12767469ebf3888b8037421cb6834f37f946646265ecMathieu Chartier 12772b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartiervoid MarkSweep::FinishPhase() { 12785fe9af720048673e62ee29597a30bb9e54c903c5Ian Rogers TimingLogger::ScopedSplit split("FinishPhase", &timings_); 12794654322261c8e4d799acdea60a7e227f33c5c2dbAnwar Ghuloum // Can't enqueue references if we hold the mutator lock. 12801d54e73444e017d3a65234e0f193846f3e27472bIan Rogers Heap* heap = GetHeap(); 12814654322261c8e4d799acdea60a7e227f33c5c2dbAnwar Ghuloum timings_.NewSplit("PostGcVerification"); 12821d54e73444e017d3a65234e0f193846f3e27472bIan Rogers heap->PostGcVerification(this); 12832b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 12844654322261c8e4d799acdea60a7e227f33c5c2dbAnwar Ghuloum timings_.NewSplit("RequestHeapTrim"); 12851d54e73444e017d3a65234e0f193846f3e27472bIan Rogers heap->RequestHeapTrim(); 128665db880c73718f89278dac8975d58d3a49ff1fdbMathieu Chartier 12872b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Update the cumulative statistics 12882775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier total_freed_objects_ += GetFreedObjects() + GetFreedLargeObjects(); 12892775ee4f82dff260663ca16adddc0b15327aaa42Mathieu Chartier total_freed_bytes_ += GetFreedBytes() + GetFreedLargeObjectBytes(); 12902b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 12912b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Ensure that the mark stack is empty. 12922b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier CHECK(mark_stack_->IsEmpty()); 12932b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier 1294d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountScannedTypes) { 1295d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "MarkSweep scanned classes=" << class_count_ << " arrays=" << array_count_ 1296d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier << " other=" << other_count_; 129702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 129802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 129902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kCountTasks) { 1300d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Total number of work chunks allocated: " << work_chunks_created_; 130102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 130202b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 130302b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kMeasureOverhead) { 1304d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Overhead time " << PrettyDuration(overhead_time_); 130502b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 130602b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 130702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kProfileLargeObjects) { 1308d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Large objects tested " << large_object_test_ << " marked " << large_object_mark_; 130902b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 131002b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 131102b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier if (kCountClassesMarked) { 1312d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "Classes marked " << classes_marked_; 1313d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier } 1314d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier 1315d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier if (kCountJavaLangRefs) { 1316d22d54849c96760aa1efa259d6dcfbace54da2afMathieu Chartier VLOG(gc) << "References scanned " << reference_count_; 131702b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier } 131802b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier 13192b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier // Update the cumulative loggers. 13202b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier cumulative_timings_.Start(); 13216f28d91aab952e3244fbb4e707fa38f85538f374Anwar Ghuloum cumulative_timings_.AddLogger(timings_); 13222b82db45c09450022199376c3a5420eacf2aa81eMathieu Chartier cumulative_timings_.End(); 1323357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 132402b6a78038f12c109f95eb31713cfc747f5512f1Mathieu Chartier // Clear all of the spaces' mark bitmaps. 132502e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (const auto& space : GetHeap()->GetContinuousSpaces()) { 1326590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier accounting::SpaceBitmap* bitmap = space->GetMarkBitmap(); 1327590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (bitmap != nullptr && 1328590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier space->GetGcRetentionPolicy() != space::kGcRetentionPolicyNeverCollect) { 1329590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier bitmap->Clear(); 1330b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 1331b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 13325301cd241b4d8afbfc1211e107c41f1b15c6bd48Mathieu Chartier mark_stack_->Reset(); 1333e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier 1334e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier // Reset the marked large objects. 13351d54e73444e017d3a65234e0f193846f3e27472bIan Rogers space::LargeObjectSpace* large_objects = GetHeap()->GetLargeObjectsSpace(); 1336e0f0cb3d855cb5e926452b5e1ec8457adc4e454eMathieu Chartier large_objects->GetMarkObjects()->Clear(); 133769759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} 133869759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro 13391d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace collector 13401d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace gc 134169759eaa6fd4386f1e6d8748052ad221087b3476Carl Shapiro} // namespace art 1342