| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "heap.h" |
| |
| #include <limits> |
| #include <memory> |
| #include <vector> |
| |
| #include "android-base/stringprintf.h" |
| |
| #include "allocation_listener.h" |
| #include "art_field-inl.h" |
| #include "backtrace_helper.h" |
| #include "base/allocator.h" |
| #include "base/arena_allocator.h" |
| #include "base/dumpable.h" |
| #include "base/histogram-inl.h" |
| #include "base/memory_tool.h" |
| #include "base/stl_util.h" |
| #include "base/systrace.h" |
| #include "base/time_utils.h" |
| #include "common_throws.h" |
| #include "cutils/sched_policy.h" |
| #include "debugger.h" |
| #include "dex_file-inl.h" |
| #include "gc/accounting/atomic_stack.h" |
| #include "gc/accounting/card_table-inl.h" |
| #include "gc/accounting/heap_bitmap-inl.h" |
| #include "gc/accounting/mod_union_table-inl.h" |
| #include "gc/accounting/remembered_set.h" |
| #include "gc/accounting/space_bitmap-inl.h" |
| #include "gc/collector/concurrent_copying.h" |
| #include "gc/collector/mark_compact.h" |
| #include "gc/collector/mark_sweep.h" |
| #include "gc/collector/partial_mark_sweep.h" |
| #include "gc/collector/semi_space.h" |
| #include "gc/collector/sticky_mark_sweep.h" |
| #include "gc/reference_processor.h" |
| #include "gc/scoped_gc_critical_section.h" |
| #include "gc/space/bump_pointer_space.h" |
| #include "gc/space/dlmalloc_space-inl.h" |
| #include "gc/space/image_space.h" |
| #include "gc/space/large_object_space.h" |
| #include "gc/space/region_space.h" |
| #include "gc/space/rosalloc_space-inl.h" |
| #include "gc/space/space-inl.h" |
| #include "gc/space/zygote_space.h" |
| #include "gc/task_processor.h" |
| #include "gc/verification.h" |
| #include "entrypoints/quick/quick_alloc_entrypoints.h" |
| #include "gc_pause_listener.h" |
| #include "heap-inl.h" |
| #include "image.h" |
| #include "intern_table.h" |
| #include "java_vm_ext.h" |
| #include "jit/jit.h" |
| #include "jit/jit_code_cache.h" |
| #include "obj_ptr-inl.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/object-inl.h" |
| #include "mirror/object-refvisitor-inl.h" |
| #include "mirror/object_array-inl.h" |
| #include "mirror/reference-inl.h" |
| #include "os.h" |
| #include "reflection.h" |
| #include "runtime.h" |
| #include "ScopedLocalRef.h" |
| #include "scoped_thread_state_change-inl.h" |
| #include "handle_scope-inl.h" |
| #include "thread_list.h" |
| #include "verify_object-inl.h" |
| #include "well_known_classes.h" |
| |
| namespace art { |
| |
| namespace gc { |
| |
| using android::base::StringPrintf; |
| |
| static constexpr size_t kCollectorTransitionStressIterations = 0; |
| static constexpr size_t kCollectorTransitionStressWait = 10 * 1000; // Microseconds |
| // Minimum amount of remaining bytes before a concurrent GC is triggered. |
| static constexpr size_t kMinConcurrentRemainingBytes = 128 * KB; |
| static constexpr size_t kMaxConcurrentRemainingBytes = 512 * KB; |
| // Sticky GC throughput adjustment, divided by 4. Increasing this causes sticky GC to occur more |
| // relative to partial/full GC. This may be desirable since sticky GCs interfere less with mutator |
| // threads (lower pauses, use less memory bandwidth). |
| static constexpr double kStickyGcThroughputAdjustment = 1.0; |
| // Whether or not we compact the zygote in PreZygoteFork. |
| static constexpr bool kCompactZygote = kMovingCollector; |
| // How many reserve entries are at the end of the allocation stack, these are only needed if the |
| // allocation stack overflows. |
| static constexpr size_t kAllocationStackReserveSize = 1024; |
| // Default mark stack size in bytes. |
| static const size_t kDefaultMarkStackSize = 64 * KB; |
| // Define space name. |
| static const char* kDlMallocSpaceName[2] = {"main dlmalloc space", "main dlmalloc space 1"}; |
| static const char* kRosAllocSpaceName[2] = {"main rosalloc space", "main rosalloc space 1"}; |
| static const char* kMemMapSpaceName[2] = {"main space", "main space 1"}; |
| static const char* kNonMovingSpaceName = "non moving space"; |
| static const char* kZygoteSpaceName = "zygote space"; |
| static constexpr size_t kGSSBumpPointerSpaceCapacity = 32 * MB; |
| static constexpr bool kGCALotMode = false; |
| // GC alot mode uses a small allocation stack to stress test a lot of GC. |
| static constexpr size_t kGcAlotAllocationStackSize = 4 * KB / |
| sizeof(mirror::HeapReference<mirror::Object>); |
| // Verify objet has a small allocation stack size since searching the allocation stack is slow. |
| static constexpr size_t kVerifyObjectAllocationStackSize = 16 * KB / |
| sizeof(mirror::HeapReference<mirror::Object>); |
| static constexpr size_t kDefaultAllocationStackSize = 8 * MB / |
| sizeof(mirror::HeapReference<mirror::Object>); |
| // System.runFinalization can deadlock with native allocations, to deal with this, we have a |
| // timeout on how long we wait for finalizers to run. b/21544853 |
| static constexpr uint64_t kNativeAllocationFinalizeTimeout = MsToNs(250u); |
| |
| // For deterministic compilation, we need the heap to be at a well-known address. |
| static constexpr uint32_t kAllocSpaceBeginForDeterministicAoT = 0x40000000; |
| // Dump the rosalloc stats on SIGQUIT. |
| static constexpr bool kDumpRosAllocStatsOnSigQuit = false; |
| |
| // Extra added to the heap growth multiplier. Used to adjust the GC ergonomics for the read barrier |
| // config. |
| static constexpr double kExtraHeapGrowthMultiplier = kUseReadBarrier ? 1.0 : 0.0; |
| |
| static const char* kRegionSpaceName = "main space (region space)"; |
| |
| // If true, we log all GCs in the both the foreground and background. Used for debugging. |
| static constexpr bool kLogAllGCs = false; |
| |
| // How much we grow the TLAB if we can do it. |
| static constexpr size_t kPartialTlabSize = 16 * KB; |
| static constexpr bool kUsePartialTlabs = true; |
| |
| #if defined(__LP64__) || !defined(ADDRESS_SANITIZER) |
| // 300 MB (0x12c00000) - (default non-moving space capacity). |
| static uint8_t* const kPreferredAllocSpaceBegin = |
| reinterpret_cast<uint8_t*>(300 * MB - Heap::kDefaultNonMovingSpaceCapacity); |
| #else |
| // For 32-bit, use 0x20000000 because asan reserves 0x04000000 - 0x20000000. |
| static uint8_t* const kPreferredAllocSpaceBegin = reinterpret_cast<uint8_t*>(0x20000000); |
| #endif |
| |
| static inline bool CareAboutPauseTimes() { |
| return Runtime::Current()->InJankPerceptibleProcessState(); |
| } |
| |
| Heap::Heap(size_t initial_size, |
| size_t growth_limit, |
| size_t min_free, |
| size_t max_free, |
| double target_utilization, |
| double foreground_heap_growth_multiplier, |
| size_t capacity, |
| size_t non_moving_space_capacity, |
| const std::string& image_file_name, |
| const InstructionSet image_instruction_set, |
| CollectorType foreground_collector_type, |
| CollectorType background_collector_type, |
| space::LargeObjectSpaceType large_object_space_type, |
| size_t large_object_threshold, |
| size_t parallel_gc_threads, |
| size_t conc_gc_threads, |
| bool low_memory_mode, |
| size_t long_pause_log_threshold, |
| size_t long_gc_log_threshold, |
| bool ignore_max_footprint, |
| bool use_tlab, |
| bool verify_pre_gc_heap, |
| bool verify_pre_sweeping_heap, |
| bool verify_post_gc_heap, |
| bool verify_pre_gc_rosalloc, |
| bool verify_pre_sweeping_rosalloc, |
| bool verify_post_gc_rosalloc, |
| bool gc_stress_mode, |
| bool measure_gc_performance, |
| bool use_homogeneous_space_compaction_for_oom, |
| uint64_t min_interval_homogeneous_space_compaction_by_oom) |
| : non_moving_space_(nullptr), |
| rosalloc_space_(nullptr), |
| dlmalloc_space_(nullptr), |
| main_space_(nullptr), |
| collector_type_(kCollectorTypeNone), |
| foreground_collector_type_(foreground_collector_type), |
| background_collector_type_(background_collector_type), |
| desired_collector_type_(foreground_collector_type_), |
| pending_task_lock_(nullptr), |
| parallel_gc_threads_(parallel_gc_threads), |
| conc_gc_threads_(conc_gc_threads), |
| low_memory_mode_(low_memory_mode), |
| long_pause_log_threshold_(long_pause_log_threshold), |
| long_gc_log_threshold_(long_gc_log_threshold), |
| ignore_max_footprint_(ignore_max_footprint), |
| zygote_creation_lock_("zygote creation lock", kZygoteCreationLock), |
| zygote_space_(nullptr), |
| large_object_threshold_(large_object_threshold), |
| disable_thread_flip_count_(0), |
| thread_flip_running_(false), |
| collector_type_running_(kCollectorTypeNone), |
| thread_running_gc_(nullptr), |
| last_gc_type_(collector::kGcTypeNone), |
| next_gc_type_(collector::kGcTypePartial), |
| capacity_(capacity), |
| growth_limit_(growth_limit), |
| max_allowed_footprint_(initial_size), |
| concurrent_start_bytes_(std::numeric_limits<size_t>::max()), |
| total_bytes_freed_ever_(0), |
| total_objects_freed_ever_(0), |
| num_bytes_allocated_(0), |
| new_native_bytes_allocated_(0), |
| old_native_bytes_allocated_(0), |
| num_bytes_freed_revoke_(0), |
| verify_missing_card_marks_(false), |
| verify_system_weaks_(false), |
| verify_pre_gc_heap_(verify_pre_gc_heap), |
| verify_pre_sweeping_heap_(verify_pre_sweeping_heap), |
| verify_post_gc_heap_(verify_post_gc_heap), |
| verify_mod_union_table_(false), |
| verify_pre_gc_rosalloc_(verify_pre_gc_rosalloc), |
| verify_pre_sweeping_rosalloc_(verify_pre_sweeping_rosalloc), |
| verify_post_gc_rosalloc_(verify_post_gc_rosalloc), |
| gc_stress_mode_(gc_stress_mode), |
| /* For GC a lot mode, we limit the allocations stacks to be kGcAlotInterval allocations. This |
| * causes a lot of GC since we do a GC for alloc whenever the stack is full. When heap |
| * verification is enabled, we limit the size of allocation stacks to speed up their |
| * searching. |
| */ |
| max_allocation_stack_size_(kGCALotMode ? kGcAlotAllocationStackSize |
| : (kVerifyObjectSupport > kVerifyObjectModeFast) ? kVerifyObjectAllocationStackSize : |
| kDefaultAllocationStackSize), |
| current_allocator_(kAllocatorTypeDlMalloc), |
| current_non_moving_allocator_(kAllocatorTypeNonMoving), |
| bump_pointer_space_(nullptr), |
| temp_space_(nullptr), |
| region_space_(nullptr), |
| min_free_(min_free), |
| max_free_(max_free), |
| target_utilization_(target_utilization), |
| foreground_heap_growth_multiplier_( |
| foreground_heap_growth_multiplier + kExtraHeapGrowthMultiplier), |
| total_wait_time_(0), |
| verify_object_mode_(kVerifyObjectModeDisabled), |
| disable_moving_gc_count_(0), |
| semi_space_collector_(nullptr), |
| mark_compact_collector_(nullptr), |
| concurrent_copying_collector_(nullptr), |
| is_running_on_memory_tool_(Runtime::Current()->IsRunningOnMemoryTool()), |
| use_tlab_(use_tlab), |
| main_space_backup_(nullptr), |
| min_interval_homogeneous_space_compaction_by_oom_( |
| min_interval_homogeneous_space_compaction_by_oom), |
| last_time_homogeneous_space_compaction_by_oom_(NanoTime()), |
| pending_collector_transition_(nullptr), |
| pending_heap_trim_(nullptr), |
| use_homogeneous_space_compaction_for_oom_(use_homogeneous_space_compaction_for_oom), |
| running_collection_is_blocking_(false), |
| blocking_gc_count_(0U), |
| blocking_gc_time_(0U), |
| last_update_time_gc_count_rate_histograms_( // Round down by the window duration. |
| (NanoTime() / kGcCountRateHistogramWindowDuration) * kGcCountRateHistogramWindowDuration), |
| gc_count_last_window_(0U), |
| blocking_gc_count_last_window_(0U), |
| gc_count_rate_histogram_("gc count rate histogram", 1U, kGcCountRateMaxBucketCount), |
| blocking_gc_count_rate_histogram_("blocking gc count rate histogram", 1U, |
| kGcCountRateMaxBucketCount), |
| alloc_tracking_enabled_(false), |
| backtrace_lock_(nullptr), |
| seen_backtrace_count_(0u), |
| unique_backtrace_count_(0u), |
| gc_disabled_for_shutdown_(false) { |
| if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) { |
| LOG(INFO) << "Heap() entering"; |
| } |
| if (kUseReadBarrier) { |
| CHECK_EQ(foreground_collector_type_, kCollectorTypeCC); |
| CHECK_EQ(background_collector_type_, kCollectorTypeCCBackground); |
| } |
| verification_.reset(new Verification(this)); |
| CHECK_GE(large_object_threshold, kMinLargeObjectThreshold); |
| ScopedTrace trace(__FUNCTION__); |
| Runtime* const runtime = Runtime::Current(); |
| // If we aren't the zygote, switch to the default non zygote allocator. This may update the |
| // entrypoints. |
| const bool is_zygote = runtime->IsZygote(); |
| if (!is_zygote) { |
| // Background compaction is currently not supported for command line runs. |
| if (background_collector_type_ != foreground_collector_type_) { |
| VLOG(heap) << "Disabling background compaction for non zygote"; |
| background_collector_type_ = foreground_collector_type_; |
| } |
| } |
| ChangeCollector(desired_collector_type_); |
| live_bitmap_.reset(new accounting::HeapBitmap(this)); |
| mark_bitmap_.reset(new accounting::HeapBitmap(this)); |
| // Requested begin for the alloc space, to follow the mapped image and oat files |
| uint8_t* requested_alloc_space_begin = nullptr; |
| if (foreground_collector_type_ == kCollectorTypeCC) { |
| // Need to use a low address so that we can allocate a contiguous 2 * Xmx space when there's no |
| // image (dex2oat for target). |
| requested_alloc_space_begin = kPreferredAllocSpaceBegin; |
| } |
| |
| // Load image space(s). |
| if (space::ImageSpace::LoadBootImage(image_file_name, |
| image_instruction_set, |
| &boot_image_spaces_, |
| &requested_alloc_space_begin)) { |
| for (auto space : boot_image_spaces_) { |
| AddSpace(space); |
| } |
| } |
| |
| /* |
| requested_alloc_space_begin -> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |
| +- nonmoving space (non_moving_space_capacity)+- |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |
| +-????????????????????????????????????????????+- |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |
| +-main alloc space / bump space 1 (capacity_) +- |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |
| +-????????????????????????????????????????????+- |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |
| +-main alloc space2 / bump space 2 (capacity_)+- |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |
| */ |
| // We don't have hspace compaction enabled with GSS or CC. |
| if (foreground_collector_type_ == kCollectorTypeGSS || |
| foreground_collector_type_ == kCollectorTypeCC) { |
| use_homogeneous_space_compaction_for_oom_ = false; |
| } |
| bool support_homogeneous_space_compaction = |
| background_collector_type_ == gc::kCollectorTypeHomogeneousSpaceCompact || |
| use_homogeneous_space_compaction_for_oom_; |
| // We may use the same space the main space for the non moving space if we don't need to compact |
| // from the main space. |
| // This is not the case if we support homogeneous compaction or have a moving background |
| // collector type. |
| bool separate_non_moving_space = is_zygote || |
| support_homogeneous_space_compaction || IsMovingGc(foreground_collector_type_) || |
| IsMovingGc(background_collector_type_); |
| if (foreground_collector_type_ == kCollectorTypeGSS) { |
| separate_non_moving_space = false; |
| } |
| std::unique_ptr<MemMap> main_mem_map_1; |
| std::unique_ptr<MemMap> main_mem_map_2; |
| |
| // Gross hack to make dex2oat deterministic. |
| if (foreground_collector_type_ == kCollectorTypeMS && |
| requested_alloc_space_begin == nullptr && |
| Runtime::Current()->IsAotCompiler()) { |
| // Currently only enabled for MS collector since that is what the deterministic dex2oat uses. |
| // b/26849108 |
| requested_alloc_space_begin = reinterpret_cast<uint8_t*>(kAllocSpaceBeginForDeterministicAoT); |
| } |
| uint8_t* request_begin = requested_alloc_space_begin; |
| if (request_begin != nullptr && separate_non_moving_space) { |
| request_begin += non_moving_space_capacity; |
| } |
| std::string error_str; |
| std::unique_ptr<MemMap> non_moving_space_mem_map; |
| if (separate_non_moving_space) { |
| ScopedTrace trace2("Create separate non moving space"); |
| // If we are the zygote, the non moving space becomes the zygote space when we run |
| // PreZygoteFork the first time. In this case, call the map "zygote space" since we can't |
| // rename the mem map later. |
| const char* space_name = is_zygote ? kZygoteSpaceName : kNonMovingSpaceName; |
| // Reserve the non moving mem map before the other two since it needs to be at a specific |
| // address. |
| non_moving_space_mem_map.reset( |
| MemMap::MapAnonymous(space_name, requested_alloc_space_begin, |
| non_moving_space_capacity, PROT_READ | PROT_WRITE, true, false, |
| &error_str)); |
| CHECK(non_moving_space_mem_map != nullptr) << error_str; |
| // Try to reserve virtual memory at a lower address if we have a separate non moving space. |
| request_begin = kPreferredAllocSpaceBegin + non_moving_space_capacity; |
| } |
| // Attempt to create 2 mem maps at or after the requested begin. |
| if (foreground_collector_type_ != kCollectorTypeCC) { |
| ScopedTrace trace2("Create main mem map"); |
| if (separate_non_moving_space || !is_zygote) { |
| main_mem_map_1.reset(MapAnonymousPreferredAddress(kMemMapSpaceName[0], |
| request_begin, |
| capacity_, |
| &error_str)); |
| } else { |
| // If no separate non-moving space and we are the zygote, the main space must come right |
| // after the image space to avoid a gap. This is required since we want the zygote space to |
| // be adjacent to the image space. |
| main_mem_map_1.reset(MemMap::MapAnonymous(kMemMapSpaceName[0], request_begin, capacity_, |
| PROT_READ | PROT_WRITE, true, false, |
| &error_str)); |
| } |
| CHECK(main_mem_map_1.get() != nullptr) << error_str; |
| } |
| if (support_homogeneous_space_compaction || |
| background_collector_type_ == kCollectorTypeSS || |
| foreground_collector_type_ == kCollectorTypeSS) { |
| ScopedTrace trace2("Create main mem map 2"); |
| main_mem_map_2.reset(MapAnonymousPreferredAddress(kMemMapSpaceName[1], main_mem_map_1->End(), |
| capacity_, &error_str)); |
| CHECK(main_mem_map_2.get() != nullptr) << error_str; |
| } |
| |
| // Create the non moving space first so that bitmaps don't take up the address range. |
| if (separate_non_moving_space) { |
| ScopedTrace trace2("Add non moving space"); |
| // Non moving space is always dlmalloc since we currently don't have support for multiple |
| // active rosalloc spaces. |
| const size_t size = non_moving_space_mem_map->Size(); |
| non_moving_space_ = space::DlMallocSpace::CreateFromMemMap( |
| non_moving_space_mem_map.release(), "zygote / non moving space", kDefaultStartingSize, |
| initial_size, size, size, false); |
| non_moving_space_->SetFootprintLimit(non_moving_space_->Capacity()); |
| CHECK(non_moving_space_ != nullptr) << "Failed creating non moving space " |
| << requested_alloc_space_begin; |
| AddSpace(non_moving_space_); |
| } |
| // Create other spaces based on whether or not we have a moving GC. |
| if (foreground_collector_type_ == kCollectorTypeCC) { |
| CHECK(separate_non_moving_space); |
| MemMap* region_space_mem_map = space::RegionSpace::CreateMemMap(kRegionSpaceName, |
| capacity_ * 2, |
| request_begin); |
| CHECK(region_space_mem_map != nullptr) << "No region space mem map"; |
| region_space_ = space::RegionSpace::Create(kRegionSpaceName, region_space_mem_map); |
| AddSpace(region_space_); |
| } else if (IsMovingGc(foreground_collector_type_) && |
| foreground_collector_type_ != kCollectorTypeGSS) { |
| // Create bump pointer spaces. |
| // We only to create the bump pointer if the foreground collector is a compacting GC. |
| // TODO: Place bump-pointer spaces somewhere to minimize size of card table. |
| bump_pointer_space_ = space::BumpPointerSpace::CreateFromMemMap("Bump pointer space 1", |
| main_mem_map_1.release()); |
| CHECK(bump_pointer_space_ != nullptr) << "Failed to create bump pointer space"; |
| AddSpace(bump_pointer_space_); |
| temp_space_ = space::BumpPointerSpace::CreateFromMemMap("Bump pointer space 2", |
| main_mem_map_2.release()); |
| CHECK(temp_space_ != nullptr) << "Failed to create bump pointer space"; |
| AddSpace(temp_space_); |
| CHECK(separate_non_moving_space); |
| } else { |
| CreateMainMallocSpace(main_mem_map_1.release(), initial_size, growth_limit_, capacity_); |
| CHECK(main_space_ != nullptr); |
| AddSpace(main_space_); |
| if (!separate_non_moving_space) { |
| non_moving_space_ = main_space_; |
| CHECK(!non_moving_space_->CanMoveObjects()); |
| } |
| if (foreground_collector_type_ == kCollectorTypeGSS) { |
| CHECK_EQ(foreground_collector_type_, background_collector_type_); |
| // Create bump pointer spaces instead of a backup space. |
| main_mem_map_2.release(); |
| bump_pointer_space_ = space::BumpPointerSpace::Create("Bump pointer space 1", |
| kGSSBumpPointerSpaceCapacity, nullptr); |
| CHECK(bump_pointer_space_ != nullptr); |
| AddSpace(bump_pointer_space_); |
| temp_space_ = space::BumpPointerSpace::Create("Bump pointer space 2", |
| kGSSBumpPointerSpaceCapacity, nullptr); |
| CHECK(temp_space_ != nullptr); |
| AddSpace(temp_space_); |
| } else if (main_mem_map_2.get() != nullptr) { |
| const char* name = kUseRosAlloc ? kRosAllocSpaceName[1] : kDlMallocSpaceName[1]; |
| main_space_backup_.reset(CreateMallocSpaceFromMemMap(main_mem_map_2.release(), initial_size, |
| growth_limit_, capacity_, name, true)); |
| CHECK(main_space_backup_.get() != nullptr); |
| // Add the space so its accounted for in the heap_begin and heap_end. |
| AddSpace(main_space_backup_.get()); |
| } |
| } |
| CHECK(non_moving_space_ != nullptr); |
| CHECK(!non_moving_space_->CanMoveObjects()); |
| // Allocate the large object space. |
| if (large_object_space_type == space::LargeObjectSpaceType::kFreeList) { |
| large_object_space_ = space::FreeListSpace::Create("free list large object space", nullptr, |
| capacity_); |
| CHECK(large_object_space_ != nullptr) << "Failed to create large object space"; |
| } else if (large_object_space_type == space::LargeObjectSpaceType::kMap) { |
| large_object_space_ = space::LargeObjectMapSpace::Create("mem map large object space"); |
| CHECK(large_object_space_ != nullptr) << "Failed to create large object space"; |
| } else { |
| // Disable the large object space by making the cutoff excessively large. |
| large_object_threshold_ = std::numeric_limits<size_t>::max(); |
| large_object_space_ = nullptr; |
| } |
| if (large_object_space_ != nullptr) { |
| AddSpace(large_object_space_); |
| } |
| // Compute heap capacity. Continuous spaces are sorted in order of Begin(). |
| CHECK(!continuous_spaces_.empty()); |
| // Relies on the spaces being sorted. |
| uint8_t* heap_begin = continuous_spaces_.front()->Begin(); |
| uint8_t* heap_end = continuous_spaces_.back()->Limit(); |
| size_t heap_capacity = heap_end - heap_begin; |
| // Remove the main backup space since it slows down the GC to have unused extra spaces. |
| // TODO: Avoid needing to do this. |
| if (main_space_backup_.get() != nullptr) { |
| RemoveSpace(main_space_backup_.get()); |
| } |
| // Allocate the card table. |
| // We currently don't support dynamically resizing the card table. |
| // Since we don't know where in the low_4gb the app image will be located, make the card table |
| // cover the whole low_4gb. TODO: Extend the card table in AddSpace. |
| UNUSED(heap_capacity); |
| // Start at 64 KB, we can be sure there are no spaces mapped this low since the address range is |
| // reserved by the kernel. |
| static constexpr size_t kMinHeapAddress = 4 * KB; |
| card_table_.reset(accounting::CardTable::Create(reinterpret_cast<uint8_t*>(kMinHeapAddress), |
| 4 * GB - kMinHeapAddress)); |
| CHECK(card_table_.get() != nullptr) << "Failed to create card table"; |
| if (foreground_collector_type_ == kCollectorTypeCC && kUseTableLookupReadBarrier) { |
| rb_table_.reset(new accounting::ReadBarrierTable()); |
| DCHECK(rb_table_->IsAllCleared()); |
| } |
| if (HasBootImageSpace()) { |
| // Don't add the image mod union table if we are running without an image, this can crash if |
| // we use the CardCache implementation. |
| for (space::ImageSpace* image_space : GetBootImageSpaces()) { |
| accounting::ModUnionTable* mod_union_table = new accounting::ModUnionTableToZygoteAllocspace( |
| "Image mod-union table", this, image_space); |
| CHECK(mod_union_table != nullptr) << "Failed to create image mod-union table"; |
| AddModUnionTable(mod_union_table); |
| } |
| } |
| if (collector::SemiSpace::kUseRememberedSet && non_moving_space_ != main_space_) { |
| accounting::RememberedSet* non_moving_space_rem_set = |
| new accounting::RememberedSet("Non-moving space remembered set", this, non_moving_space_); |
| CHECK(non_moving_space_rem_set != nullptr) << "Failed to create non-moving space remembered set"; |
| AddRememberedSet(non_moving_space_rem_set); |
| } |
| // TODO: Count objects in the image space here? |
| num_bytes_allocated_.StoreRelaxed(0); |
| mark_stack_.reset(accounting::ObjectStack::Create("mark stack", kDefaultMarkStackSize, |
| kDefaultMarkStackSize)); |
| const size_t alloc_stack_capacity = max_allocation_stack_size_ + kAllocationStackReserveSize; |
| allocation_stack_.reset(accounting::ObjectStack::Create( |
| "allocation stack", max_allocation_stack_size_, alloc_stack_capacity)); |
| live_stack_.reset(accounting::ObjectStack::Create( |
| "live stack", max_allocation_stack_size_, alloc_stack_capacity)); |
| // It's still too early to take a lock because there are no threads yet, but we can create locks |
| // now. We don't create it earlier to make it clear that you can't use locks during heap |
| // initialization. |
| gc_complete_lock_ = new Mutex("GC complete lock"); |
| gc_complete_cond_.reset(new ConditionVariable("GC complete condition variable", |
| *gc_complete_lock_)); |
| native_blocking_gc_lock_ = new Mutex("Native blocking GC lock"); |
| native_blocking_gc_cond_.reset(new ConditionVariable("Native blocking GC condition variable", |
| *native_blocking_gc_lock_)); |
| native_blocking_gc_in_progress_ = false; |
| native_blocking_gcs_finished_ = 0; |
| |
| thread_flip_lock_ = new Mutex("GC thread flip lock"); |
| thread_flip_cond_.reset(new ConditionVariable("GC thread flip condition variable", |
| *thread_flip_lock_)); |
| task_processor_.reset(new TaskProcessor()); |
| reference_processor_.reset(new ReferenceProcessor()); |
| pending_task_lock_ = new Mutex("Pending task lock"); |
| if (ignore_max_footprint_) { |
| SetIdealFootprint(std::numeric_limits<size_t>::max()); |
| concurrent_start_bytes_ = std::numeric_limits<size_t>::max(); |
| } |
| CHECK_NE(max_allowed_footprint_, 0U); |
| // Create our garbage collectors. |
| for (size_t i = 0; i < 2; ++i) { |
| const bool concurrent = i != 0; |
| if ((MayUseCollector(kCollectorTypeCMS) && concurrent) || |
| (MayUseCollector(kCollectorTypeMS) && !concurrent)) { |
| garbage_collectors_.push_back(new collector::MarkSweep(this, concurrent)); |
| garbage_collectors_.push_back(new collector::PartialMarkSweep(this, concurrent)); |
| garbage_collectors_.push_back(new collector::StickyMarkSweep(this, concurrent)); |
| } |
| } |
| if (kMovingCollector) { |
| if (MayUseCollector(kCollectorTypeSS) || MayUseCollector(kCollectorTypeGSS) || |
| MayUseCollector(kCollectorTypeHomogeneousSpaceCompact) || |
| use_homogeneous_space_compaction_for_oom_) { |
| // TODO: Clean this up. |
| const bool generational = foreground_collector_type_ == kCollectorTypeGSS; |
| semi_space_collector_ = new collector::SemiSpace(this, generational, |
| generational ? "generational" : ""); |
| garbage_collectors_.push_back(semi_space_collector_); |
| } |
| if (MayUseCollector(kCollectorTypeCC)) { |
| concurrent_copying_collector_ = new collector::ConcurrentCopying(this, |
| "", |
| measure_gc_performance); |
| DCHECK(region_space_ != nullptr); |
| concurrent_copying_collector_->SetRegionSpace(region_space_); |
| garbage_collectors_.push_back(concurrent_copying_collector_); |
| } |
| if (MayUseCollector(kCollectorTypeMC)) { |
| mark_compact_collector_ = new collector::MarkCompact(this); |
| garbage_collectors_.push_back(mark_compact_collector_); |
| } |
| } |
| if (!GetBootImageSpaces().empty() && non_moving_space_ != nullptr && |
| (is_zygote || separate_non_moving_space || foreground_collector_type_ == kCollectorTypeGSS)) { |
| // Check that there's no gap between the image space and the non moving space so that the |
| // immune region won't break (eg. due to a large object allocated in the gap). This is only |
| // required when we're the zygote or using GSS. |
| // Space with smallest Begin(). |
| space::ImageSpace* first_space = nullptr; |
| for (space::ImageSpace* space : boot_image_spaces_) { |
| if (first_space == nullptr || space->Begin() < first_space->Begin()) { |
| first_space = space; |
| } |
| } |
| bool no_gap = MemMap::CheckNoGaps(first_space->GetMemMap(), non_moving_space_->GetMemMap()); |
| if (!no_gap) { |
| PrintFileToLog("/proc/self/maps", LogSeverity::ERROR); |
| MemMap::DumpMaps(LOG_STREAM(ERROR), true); |
| LOG(FATAL) << "There's a gap between the image space and the non-moving space"; |
| } |
| } |
| instrumentation::Instrumentation* const instrumentation = runtime->GetInstrumentation(); |
| if (gc_stress_mode_) { |
| backtrace_lock_ = new Mutex("GC complete lock"); |
| } |
| if (is_running_on_memory_tool_ || gc_stress_mode_) { |
| instrumentation->InstrumentQuickAllocEntryPoints(); |
| } |
| if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) { |
| LOG(INFO) << "Heap() exiting"; |
| } |
| } |
| |
| MemMap* Heap::MapAnonymousPreferredAddress(const char* name, |
| uint8_t* request_begin, |
| size_t capacity, |
| std::string* out_error_str) { |
| while (true) { |
| MemMap* map = MemMap::MapAnonymous(name, request_begin, capacity, |
| PROT_READ | PROT_WRITE, true, false, out_error_str); |
| if (map != nullptr || request_begin == nullptr) { |
| return map; |
| } |
| // Retry a second time with no specified request begin. |
| request_begin = nullptr; |
| } |
| } |
| |
| bool Heap::MayUseCollector(CollectorType type) const { |
| return foreground_collector_type_ == type || background_collector_type_ == type; |
| } |
| |
| space::MallocSpace* Heap::CreateMallocSpaceFromMemMap(MemMap* mem_map, |
| size_t initial_size, |
| size_t growth_limit, |
| size_t capacity, |
| const char* name, |
| bool can_move_objects) { |
| space::MallocSpace* malloc_space = nullptr; |
| if (kUseRosAlloc) { |
| // Create rosalloc space. |
| malloc_space = space::RosAllocSpace::CreateFromMemMap(mem_map, name, kDefaultStartingSize, |
| initial_size, growth_limit, capacity, |
| low_memory_mode_, can_move_objects); |
| } else { |
| malloc_space = space::DlMallocSpace::CreateFromMemMap(mem_map, name, kDefaultStartingSize, |
| initial_size, growth_limit, capacity, |
| can_move_objects); |
| } |
| if (collector::SemiSpace::kUseRememberedSet) { |
| accounting::RememberedSet* rem_set = |
| new accounting::RememberedSet(std::string(name) + " remembered set", this, malloc_space); |
| CHECK(rem_set != nullptr) << "Failed to create main space remembered set"; |
| AddRememberedSet(rem_set); |
| } |
| CHECK(malloc_space != nullptr) << "Failed to create " << name; |
| malloc_space->SetFootprintLimit(malloc_space->Capacity()); |
| return malloc_space; |
| } |
| |
| void Heap::CreateMainMallocSpace(MemMap* mem_map, size_t initial_size, size_t growth_limit, |
| size_t capacity) { |
| // Is background compaction is enabled? |
| bool can_move_objects = IsMovingGc(background_collector_type_) != |
| IsMovingGc(foreground_collector_type_) || use_homogeneous_space_compaction_for_oom_; |
| // If we are the zygote and don't yet have a zygote space, it means that the zygote fork will |
| // happen in the future. If this happens and we have kCompactZygote enabled we wish to compact |
| // from the main space to the zygote space. If background compaction is enabled, always pass in |
| // that we can move objets. |
| if (kCompactZygote && Runtime::Current()->IsZygote() && !can_move_objects) { |
| // After the zygote we want this to be false if we don't have background compaction enabled so |
| // that getting primitive array elements is faster. |
| // We never have homogeneous compaction with GSS and don't need a space with movable objects. |
| can_move_objects = !HasZygoteSpace() && foreground_collector_type_ != kCollectorTypeGSS; |
| } |
| if (collector::SemiSpace::kUseRememberedSet && main_space_ != nullptr) { |
| RemoveRememberedSet(main_space_); |
| } |
| const char* name = kUseRosAlloc ? kRosAllocSpaceName[0] : kDlMallocSpaceName[0]; |
| main_space_ = CreateMallocSpaceFromMemMap(mem_map, initial_size, growth_limit, capacity, name, |
| can_move_objects); |
| SetSpaceAsDefault(main_space_); |
| VLOG(heap) << "Created main space " << main_space_; |
| } |
| |
| void Heap::ChangeAllocator(AllocatorType allocator) { |
| if (current_allocator_ != allocator) { |
| // These two allocators are only used internally and don't have any entrypoints. |
| CHECK_NE(allocator, kAllocatorTypeLOS); |
| CHECK_NE(allocator, kAllocatorTypeNonMoving); |
| current_allocator_ = allocator; |
| MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); |
| SetQuickAllocEntryPointsAllocator(current_allocator_); |
| Runtime::Current()->GetInstrumentation()->ResetQuickAllocEntryPoints(); |
| } |
| } |
| |
| void Heap::DisableMovingGc() { |
| CHECK(!kUseReadBarrier); |
| if (IsMovingGc(foreground_collector_type_)) { |
| foreground_collector_type_ = kCollectorTypeCMS; |
| } |
| if (IsMovingGc(background_collector_type_)) { |
| background_collector_type_ = foreground_collector_type_; |
| } |
| TransitionCollector(foreground_collector_type_); |
| Thread* const self = Thread::Current(); |
| ScopedThreadStateChange tsc(self, kSuspended); |
| ScopedSuspendAll ssa(__FUNCTION__); |
| // Something may have caused the transition to fail. |
| if (!IsMovingGc(collector_type_) && non_moving_space_ != main_space_) { |
| CHECK(main_space_ != nullptr); |
| // The allocation stack may have non movable objects in it. We need to flush it since the GC |
| // can't only handle marking allocation stack objects of one non moving space and one main |
| // space. |
| { |
| WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| FlushAllocStack(); |
| } |
| main_space_->DisableMovingObjects(); |
| non_moving_space_ = main_space_; |
| CHECK(!non_moving_space_->CanMoveObjects()); |
| } |
| } |
| |
| bool Heap::IsCompilingBoot() const { |
| if (!Runtime::Current()->IsAotCompiler()) { |
| return false; |
| } |
| ScopedObjectAccess soa(Thread::Current()); |
| for (const auto& space : continuous_spaces_) { |
| if (space->IsImageSpace() || space->IsZygoteSpace()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| void Heap::IncrementDisableMovingGC(Thread* self) { |
| // Need to do this holding the lock to prevent races where the GC is about to run / running when |
| // we attempt to disable it. |
| ScopedThreadStateChange tsc(self, kWaitingForGcToComplete); |
| MutexLock mu(self, *gc_complete_lock_); |
| ++disable_moving_gc_count_; |
| if (IsMovingGc(collector_type_running_)) { |
| WaitForGcToCompleteLocked(kGcCauseDisableMovingGc, self); |
| } |
| } |
| |
| void Heap::DecrementDisableMovingGC(Thread* self) { |
| MutexLock mu(self, *gc_complete_lock_); |
| CHECK_GT(disable_moving_gc_count_, 0U); |
| --disable_moving_gc_count_; |
| } |
| |
| void Heap::IncrementDisableThreadFlip(Thread* self) { |
| // Supposed to be called by mutators. If thread_flip_running_ is true, block. Otherwise, go ahead. |
| CHECK(kUseReadBarrier); |
| bool is_nested = self->GetDisableThreadFlipCount() > 0; |
| self->IncrementDisableThreadFlipCount(); |
| if (is_nested) { |
| // If this is a nested JNI critical section enter, we don't need to wait or increment the global |
| // counter. The global counter is incremented only once for a thread for the outermost enter. |
| return; |
| } |
| ScopedThreadStateChange tsc(self, kWaitingForGcThreadFlip); |
| MutexLock mu(self, *thread_flip_lock_); |
| bool has_waited = false; |
| uint64_t wait_start = NanoTime(); |
| if (thread_flip_running_) { |
| ATRACE_BEGIN("IncrementDisableThreadFlip"); |
| while (thread_flip_running_) { |
| has_waited = true; |
| thread_flip_cond_->Wait(self); |
| } |
| ATRACE_END(); |
| } |
| ++disable_thread_flip_count_; |
| if (has_waited) { |
| uint64_t wait_time = NanoTime() - wait_start; |
| total_wait_time_ += wait_time; |
| if (wait_time > long_pause_log_threshold_) { |
| LOG(INFO) << __FUNCTION__ << " blocked for " << PrettyDuration(wait_time); |
| } |
| } |
| } |
| |
| void Heap::DecrementDisableThreadFlip(Thread* self) { |
| // Supposed to be called by mutators. Decrement disable_thread_flip_count_ and potentially wake up |
| // the GC waiting before doing a thread flip. |
| CHECK(kUseReadBarrier); |
| self->DecrementDisableThreadFlipCount(); |
| bool is_outermost = self->GetDisableThreadFlipCount() == 0; |
| if (!is_outermost) { |
| // If this is not an outermost JNI critical exit, we don't need to decrement the global counter. |
| // The global counter is decremented only once for a thread for the outermost exit. |
| return; |
| } |
| MutexLock mu(self, *thread_flip_lock_); |
| CHECK_GT(disable_thread_flip_count_, 0U); |
| --disable_thread_flip_count_; |
| if (disable_thread_flip_count_ == 0) { |
| // Potentially notify the GC thread blocking to begin a thread flip. |
| thread_flip_cond_->Broadcast(self); |
| } |
| } |
| |
| void Heap::ThreadFlipBegin(Thread* self) { |
| // Supposed to be called by GC. Set thread_flip_running_ to be true. If disable_thread_flip_count_ |
| // > 0, block. Otherwise, go ahead. |
| CHECK(kUseReadBarrier); |
| ScopedThreadStateChange tsc(self, kWaitingForGcThreadFlip); |
| MutexLock mu(self, *thread_flip_lock_); |
| bool has_waited = false; |
| uint64_t wait_start = NanoTime(); |
| CHECK(!thread_flip_running_); |
| // Set this to true before waiting so that frequent JNI critical enter/exits won't starve |
| // GC. This like a writer preference of a reader-writer lock. |
| thread_flip_running_ = true; |
| while (disable_thread_flip_count_ > 0) { |
| has_waited = true; |
| thread_flip_cond_->Wait(self); |
| } |
| if (has_waited) { |
| uint64_t wait_time = NanoTime() - wait_start; |
| total_wait_time_ += wait_time; |
| if (wait_time > long_pause_log_threshold_) { |
| LOG(INFO) << __FUNCTION__ << " blocked for " << PrettyDuration(wait_time); |
| } |
| } |
| } |
| |
| void Heap::ThreadFlipEnd(Thread* self) { |
| // Supposed to be called by GC. Set thread_flip_running_ to false and potentially wake up mutators |
| // waiting before doing a JNI critical. |
| CHECK(kUseReadBarrier); |
| MutexLock mu(self, *thread_flip_lock_); |
| CHECK(thread_flip_running_); |
| thread_flip_running_ = false; |
| // Potentially notify mutator threads blocking to enter a JNI critical section. |
| thread_flip_cond_->Broadcast(self); |
| } |
| |
| void Heap::UpdateProcessState(ProcessState old_process_state, ProcessState new_process_state) { |
| if (old_process_state != new_process_state) { |
| const bool jank_perceptible = new_process_state == kProcessStateJankPerceptible; |
| for (size_t i = 1; i <= kCollectorTransitionStressIterations; ++i) { |
| // Start at index 1 to avoid "is always false" warning. |
| // Have iteration 1 always transition the collector. |
| TransitionCollector((((i & 1) == 1) == jank_perceptible) |
| ? foreground_collector_type_ |
| : background_collector_type_); |
| usleep(kCollectorTransitionStressWait); |
| } |
| if (jank_perceptible) { |
| // Transition back to foreground right away to prevent jank. |
| RequestCollectorTransition(foreground_collector_type_, 0); |
| } else { |
| // Don't delay for debug builds since we may want to stress test the GC. |
| // If background_collector_type_ is kCollectorTypeHomogeneousSpaceCompact then we have |
| // special handling which does a homogenous space compaction once but then doesn't transition |
| // the collector. Similarly, we invoke a full compaction for kCollectorTypeCC but don't |
| // transition the collector. |
| RequestCollectorTransition(background_collector_type_, |
| kIsDebugBuild ? 0 : kCollectorTransitionWait); |
| } |
| } |
| } |
| |
| void Heap::CreateThreadPool() { |
| const size_t num_threads = std::max(parallel_gc_threads_, conc_gc_threads_); |
| if (num_threads != 0) { |
| thread_pool_.reset(new ThreadPool("Heap thread pool", num_threads)); |
| } |
| } |
| |
| // Visit objects when threads aren't suspended. If concurrent moving |
| // GC, disable moving GC and suspend threads and then visit objects. |
| void Heap::VisitObjects(ObjectCallback callback, void* arg) { |
| Thread* self = Thread::Current(); |
| Locks::mutator_lock_->AssertSharedHeld(self); |
| DCHECK(!Locks::mutator_lock_->IsExclusiveHeld(self)) << "Call VisitObjectsPaused() instead"; |
| if (IsGcConcurrentAndMoving()) { |
| // Concurrent moving GC. Just suspending threads isn't sufficient |
| // because a collection isn't one big pause and we could suspend |
| // threads in the middle (between phases) of a concurrent moving |
| // collection where it's not easily known which objects are alive |
| // (both the region space and the non-moving space) or which |
| // copies of objects to visit, and the to-space invariant could be |
| // easily broken. Visit objects while GC isn't running by using |
| // IncrementDisableMovingGC() and threads are suspended. |
| IncrementDisableMovingGC(self); |
| { |
| ScopedThreadSuspension sts(self, kWaitingForVisitObjects); |
| ScopedSuspendAll ssa(__FUNCTION__); |
| VisitObjectsInternalRegionSpace(callback, arg); |
| VisitObjectsInternal(callback, arg); |
| } |
| DecrementDisableMovingGC(self); |
| } else { |
| // Since concurrent moving GC has thread suspension, also poison ObjPtr the normal case to |
| // catch bugs. |
| self->PoisonObjectPointers(); |
| // GCs can move objects, so don't allow this. |
| ScopedAssertNoThreadSuspension ants("Visiting objects"); |
| DCHECK(region_space_ == nullptr); |
| VisitObjectsInternal(callback, arg); |
| self->PoisonObjectPointers(); |
| } |
| } |
| |
| // Visit objects when threads are already suspended. |
| void Heap::VisitObjectsPaused(ObjectCallback callback, void* arg) { |
| Thread* self = Thread::Current(); |
| Locks::mutator_lock_->AssertExclusiveHeld(self); |
| VisitObjectsInternalRegionSpace(callback, arg); |
| VisitObjectsInternal(callback, arg); |
| } |
| |
| // Visit objects in the region spaces. |
| void Heap::VisitObjectsInternalRegionSpace(ObjectCallback callback, void* arg) { |
| Thread* self = Thread::Current(); |
| Locks::mutator_lock_->AssertExclusiveHeld(self); |
| if (region_space_ != nullptr) { |
| DCHECK(IsGcConcurrentAndMoving()); |
| if (!zygote_creation_lock_.IsExclusiveHeld(self)) { |
| // Exclude the pre-zygote fork time where the semi-space collector |
| // calls VerifyHeapReferences() as part of the zygote compaction |
| // which then would call here without the moving GC disabled, |
| // which is fine. |
| bool is_thread_running_gc = false; |
| if (kIsDebugBuild) { |
| MutexLock mu(self, *gc_complete_lock_); |
| is_thread_running_gc = self == thread_running_gc_; |
| } |
| // If we are not the thread running the GC on in a GC exclusive region, then moving GC |
| // must be disabled. |
| DCHECK(is_thread_running_gc || IsMovingGCDisabled(self)); |
| } |
| region_space_->Walk(callback, arg); |
| } |
| } |
| |
| // Visit objects in the other spaces. |
| void Heap::VisitObjectsInternal(ObjectCallback callback, void* arg) { |
| if (bump_pointer_space_ != nullptr) { |
| // Visit objects in bump pointer space. |
| bump_pointer_space_->Walk(callback, arg); |
| } |
| // TODO: Switch to standard begin and end to use ranged a based loop. |
| for (auto* it = allocation_stack_->Begin(), *end = allocation_stack_->End(); it < end; ++it) { |
| mirror::Object* const obj = it->AsMirrorPtr(); |
| if (obj != nullptr && obj->GetClass() != nullptr) { |
| // Avoid the race condition caused by the object not yet being written into the allocation |
| // stack or the class not yet being written in the object. Or, if |
| // kUseThreadLocalAllocationStack, there can be nulls on the allocation stack. |
| callback(obj, arg); |
| } |
| } |
| { |
| ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| GetLiveBitmap()->Walk(callback, arg); |
| } |
| } |
| |
| void Heap::MarkAllocStackAsLive(accounting::ObjectStack* stack) { |
| space::ContinuousSpace* space1 = main_space_ != nullptr ? main_space_ : non_moving_space_; |
| space::ContinuousSpace* space2 = non_moving_space_; |
| // TODO: Generalize this to n bitmaps? |
| CHECK(space1 != nullptr); |
| CHECK(space2 != nullptr); |
| MarkAllocStack(space1->GetLiveBitmap(), space2->GetLiveBitmap(), |
| (large_object_space_ != nullptr ? large_object_space_->GetLiveBitmap() : nullptr), |
| stack); |
| } |
| |
| void Heap::DeleteThreadPool() { |
| thread_pool_.reset(nullptr); |
| } |
| |
| void Heap::AddSpace(space::Space* space) { |
| CHECK(space != nullptr); |
| WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| if (space->IsContinuousSpace()) { |
| DCHECK(!space->IsDiscontinuousSpace()); |
| space::ContinuousSpace* continuous_space = space->AsContinuousSpace(); |
| // Continuous spaces don't necessarily have bitmaps. |
| accounting::ContinuousSpaceBitmap* live_bitmap = continuous_space->GetLiveBitmap(); |
| accounting::ContinuousSpaceBitmap* mark_bitmap = continuous_space->GetMarkBitmap(); |
| // The region space bitmap is not added since VisitObjects visits the region space objects with |
| // special handling. |
| if (live_bitmap != nullptr && !space->IsRegionSpace()) { |
| CHECK(mark_bitmap != nullptr); |
| live_bitmap_->AddContinuousSpaceBitmap(live_bitmap); |
| mark_bitmap_->AddContinuousSpaceBitmap(mark_bitmap); |
| } |
| continuous_spaces_.push_back(continuous_space); |
| // Ensure that spaces remain sorted in increasing order of start address. |
| std::sort(continuous_spaces_.begin(), continuous_spaces_.end(), |
| [](const space::ContinuousSpace* a, const space::ContinuousSpace* b) { |
| return a->Begin() < b->Begin(); |
| }); |
| } else { |
| CHECK(space->IsDiscontinuousSpace()); |
| space::DiscontinuousSpace* discontinuous_space = space->AsDiscontinuousSpace(); |
| live_bitmap_->AddLargeObjectBitmap(discontinuous_space->GetLiveBitmap()); |
| mark_bitmap_->AddLargeObjectBitmap(discontinuous_space->GetMarkBitmap()); |
| discontinuous_spaces_.push_back(discontinuous_space); |
| } |
| if (space->IsAllocSpace()) { |
| alloc_spaces_.push_back(space->AsAllocSpace()); |
| } |
| } |
| |
| void Heap::SetSpaceAsDefault(space::ContinuousSpace* continuous_space) { |
| WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| if (continuous_space->IsDlMallocSpace()) { |
| dlmalloc_space_ = continuous_space->AsDlMallocSpace(); |
| } else if (continuous_space->IsRosAllocSpace()) { |
| rosalloc_space_ = continuous_space->AsRosAllocSpace(); |
| } |
| } |
| |
| void Heap::RemoveSpace(space::Space* space) { |
| DCHECK(space != nullptr); |
| WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| if (space->IsContinuousSpace()) { |
| DCHECK(!space->IsDiscontinuousSpace()); |
| space::ContinuousSpace* continuous_space = space->AsContinuousSpace(); |
| // Continuous spaces don't necessarily have bitmaps. |
| accounting::ContinuousSpaceBitmap* live_bitmap = continuous_space->GetLiveBitmap(); |
| accounting::ContinuousSpaceBitmap* mark_bitmap = continuous_space->GetMarkBitmap(); |
| if (live_bitmap != nullptr && !space->IsRegionSpace()) { |
| DCHECK(mark_bitmap != nullptr); |
| live_bitmap_->RemoveContinuousSpaceBitmap(live_bitmap); |
| mark_bitmap_->RemoveContinuousSpaceBitmap(mark_bitmap); |
| } |
| auto it = std::find(continuous_spaces_.begin(), continuous_spaces_.end(), continuous_space); |
| DCHECK(it != continuous_spaces_.end()); |
| continuous_spaces_.erase(it); |
| } else { |
| DCHECK(space->IsDiscontinuousSpace()); |
| space::DiscontinuousSpace* discontinuous_space = space->AsDiscontinuousSpace(); |
| live_bitmap_->RemoveLargeObjectBitmap(discontinuous_space->GetLiveBitmap()); |
| mark_bitmap_->RemoveLargeObjectBitmap(discontinuous_space->GetMarkBitmap()); |
| auto it = std::find(discontinuous_spaces_.begin(), discontinuous_spaces_.end(), |
| discontinuous_space); |
| DCHECK(it != discontinuous_spaces_.end()); |
| discontinuous_spaces_.erase(it); |
| } |
| if (space->IsAllocSpace()) { |
| auto it = std::find(alloc_spaces_.begin(), alloc_spaces_.end(), space->AsAllocSpace()); |
| DCHECK(it != alloc_spaces_.end()); |
| alloc_spaces_.erase(it); |
| } |
| } |
| |
| void Heap::DumpGcPerformanceInfo(std::ostream& os) { |
| // Dump cumulative timings. |
| os << "Dumping cumulative Gc timings\n"; |
| uint64_t total_duration = 0; |
| // Dump cumulative loggers for each GC type. |
| uint64_t total_paused_time = 0; |
| for (auto& collector : garbage_collectors_) { |
| total_duration += collector->GetCumulativeTimings().GetTotalNs(); |
| total_paused_time += collector->GetTotalPausedTimeNs(); |
| collector->DumpPerformanceInfo(os); |
| } |
| if (total_duration != 0) { |
| const double total_seconds = static_cast<double>(total_duration / 1000) / 1000000.0; |
| os << "Total time spent in GC: " << PrettyDuration(total_duration) << "\n"; |
| os << "Mean GC size throughput: " |
| << PrettySize(GetBytesFreedEver() / total_seconds) << "/s\n"; |
| os << "Mean GC object throughput: " |
| << (GetObjectsFreedEver() / total_seconds) << " objects/s\n"; |
| } |
| uint64_t total_objects_allocated = GetObjectsAllocatedEver(); |
| os << "Total number of allocations " << total_objects_allocated << "\n"; |
| os << "Total bytes allocated " << PrettySize(GetBytesAllocatedEver()) << "\n"; |
| os << "Total bytes freed " << PrettySize(GetBytesFreedEver()) << "\n"; |
| os << "Free memory " << PrettySize(GetFreeMemory()) << "\n"; |
| os << "Free memory until GC " << PrettySize(GetFreeMemoryUntilGC()) << "\n"; |
| os << "Free memory until OOME " << PrettySize(GetFreeMemoryUntilOOME()) << "\n"; |
| os << "Total memory " << PrettySize(GetTotalMemory()) << "\n"; |
| os << "Max memory " << PrettySize(GetMaxMemory()) << "\n"; |
| if (HasZygoteSpace()) { |
| os << "Zygote space size " << PrettySize(zygote_space_->Size()) << "\n"; |
| } |
| os << "Total mutator paused time: " << PrettyDuration(total_paused_time) << "\n"; |
| os << "Total time waiting for GC to complete: " << PrettyDuration(total_wait_time_) << "\n"; |
| os << "Total GC count: " << GetGcCount() << "\n"; |
| os << "Total GC time: " << PrettyDuration(GetGcTime()) << "\n"; |
| os << "Total blocking GC count: " << GetBlockingGcCount() << "\n"; |
| os << "Total blocking GC time: " << PrettyDuration(GetBlockingGcTime()) << "\n"; |
| |
| { |
| MutexLock mu(Thread::Current(), *gc_complete_lock_); |
| if (gc_count_rate_histogram_.SampleSize() > 0U) { |
| os << "Histogram of GC count per " << NsToMs(kGcCountRateHistogramWindowDuration) << " ms: "; |
| gc_count_rate_histogram_.DumpBins(os); |
| os << "\n"; |
| } |
| if (blocking_gc_count_rate_histogram_.SampleSize() > 0U) { |
| os << "Histogram of blocking GC count per " |
| << NsToMs(kGcCountRateHistogramWindowDuration) << " ms: "; |
| blocking_gc_count_rate_histogram_.DumpBins(os); |
| os << "\n"; |
| } |
| } |
| |
| if (kDumpRosAllocStatsOnSigQuit && rosalloc_space_ != nullptr) { |
| rosalloc_space_->DumpStats(os); |
| } |
| |
| os << "Registered native bytes allocated: " |
| << old_native_bytes_allocated_.LoadRelaxed() + new_native_bytes_allocated_.LoadRelaxed() |
| << "\n"; |
| |
| BaseMutex::DumpAll(os); |
| } |
| |
| void Heap::ResetGcPerformanceInfo() { |
| for (auto& collector : garbage_collectors_) { |
| collector->ResetMeasurements(); |
| } |
| total_bytes_freed_ever_ = 0; |
| total_objects_freed_ever_ = 0; |
| total_wait_time_ = 0; |
| blocking_gc_count_ = 0; |
| blocking_gc_time_ = 0; |
| gc_count_last_window_ = 0; |
| blocking_gc_count_last_window_ = 0; |
| last_update_time_gc_count_rate_histograms_ = // Round down by the window duration. |
| (NanoTime() / kGcCountRateHistogramWindowDuration) * kGcCountRateHistogramWindowDuration; |
| { |
| MutexLock mu(Thread::Current(), *gc_complete_lock_); |
| gc_count_rate_histogram_.Reset(); |
| blocking_gc_count_rate_histogram_.Reset(); |
| } |
| } |
| |
| uint64_t Heap::GetGcCount() const { |
| uint64_t gc_count = 0U; |
| for (auto& collector : garbage_collectors_) { |
| gc_count += collector->GetCumulativeTimings().GetIterations(); |
| } |
| return gc_count; |
| } |
| |
| uint64_t Heap::GetGcTime() const { |
| uint64_t gc_time = 0U; |
| for (auto& collector : garbage_collectors_) { |
| gc_time += collector->GetCumulativeTimings().GetTotalNs(); |
| } |
| return gc_time; |
| } |
| |
| uint64_t Heap::GetBlockingGcCount() const { |
| return blocking_gc_count_; |
| } |
| |
| uint64_t Heap::GetBlockingGcTime() const { |
| return blocking_gc_time_; |
| } |
| |
| void Heap::DumpGcCountRateHistogram(std::ostream& os) const { |
| MutexLock mu(Thread::Current(), *gc_complete_lock_); |
| if (gc_count_rate_histogram_.SampleSize() > 0U) { |
| gc_count_rate_histogram_.DumpBins(os); |
| } |
| } |
| |
| void Heap::DumpBlockingGcCountRateHistogram(std::ostream& os) const { |
| MutexLock mu(Thread::Current(), *gc_complete_lock_); |
| if (blocking_gc_count_rate_histogram_.SampleSize() > 0U) { |
| blocking_gc_count_rate_histogram_.DumpBins(os); |
| } |
| } |
| |
| ALWAYS_INLINE |
| static inline AllocationListener* GetAndOverwriteAllocationListener( |
| Atomic<AllocationListener*>* storage, AllocationListener* new_value) { |
| AllocationListener* old; |
| do { |
| old = storage->LoadSequentiallyConsistent(); |
| } while (!storage->CompareExchangeStrongSequentiallyConsistent(old, new_value)); |
| return old; |
| } |
| |
| Heap::~Heap() { |
| VLOG(heap) << "Starting ~Heap()"; |
| STLDeleteElements(&garbage_collectors_); |
| // If we don't reset then the mark stack complains in its destructor. |
| allocation_stack_->Reset(); |
| allocation_records_.reset(); |
| live_stack_->Reset(); |
| STLDeleteValues(&mod_union_tables_); |
| STLDeleteValues(&remembered_sets_); |
| STLDeleteElements(&continuous_spaces_); |
| STLDeleteElements(&discontinuous_spaces_); |
| delete gc_complete_lock_; |
| delete native_blocking_gc_lock_; |
| delete thread_flip_lock_; |
| delete pending_task_lock_; |
| delete backtrace_lock_; |
| if (unique_backtrace_count_.LoadRelaxed() != 0 || seen_backtrace_count_.LoadRelaxed() != 0) { |
| LOG(INFO) << "gc stress unique=" << unique_backtrace_count_.LoadRelaxed() |
| << " total=" << seen_backtrace_count_.LoadRelaxed() + |
| unique_backtrace_count_.LoadRelaxed(); |
| } |
| |
| VLOG(heap) << "Finished ~Heap()"; |
| } |
| |
| |
| space::ContinuousSpace* Heap::FindContinuousSpaceFromAddress(const mirror::Object* addr) const { |
| for (const auto& space : continuous_spaces_) { |
| if (space->Contains(addr)) { |
| return space; |
| } |
| } |
| return nullptr; |
| } |
| |
| space::ContinuousSpace* Heap::FindContinuousSpaceFromObject(ObjPtr<mirror::Object> obj, |
| bool fail_ok) const { |
| space::ContinuousSpace* space = FindContinuousSpaceFromAddress(obj.Ptr()); |
| if (space != nullptr) { |
| return space; |
| } |
| if (!fail_ok) { |
| LOG(FATAL) << "object " << obj << " not inside any spaces!"; |
| } |
| return nullptr; |
| } |
| |
| space::DiscontinuousSpace* Heap::FindDiscontinuousSpaceFromObject(ObjPtr<mirror::Object> obj, |
| bool fail_ok) const { |
| for (const auto& space : discontinuous_spaces_) { |
| if (space->Contains(obj.Ptr())) { |
| return space; |
| } |
| } |
| if (!fail_ok) { |
| LOG(FATAL) << "object " << obj << " not inside any spaces!"; |
| } |
| return nullptr; |
| } |
| |
| space::Space* Heap::FindSpaceFromObject(ObjPtr<mirror::Object> obj, bool fail_ok) const { |
| space::Space* result = FindContinuousSpaceFromObject(obj, true); |
| if (result != nullptr) { |
| return result; |
| } |
| return FindDiscontinuousSpaceFromObject(obj, fail_ok); |
| } |
| |
| space::Space* Heap::FindSpaceFromAddress(const void* addr) const { |
| for (const auto& space : continuous_spaces_) { |
| if (space->Contains(reinterpret_cast<const mirror::Object*>(addr))) { |
| return space; |
| } |
| } |
| for (const auto& space : discontinuous_spaces_) { |
| if (space->Contains(reinterpret_cast<const mirror::Object*>(addr))) { |
| return space; |
| } |
| } |
| return nullptr; |
| } |
| |
| |
| void Heap::ThrowOutOfMemoryError(Thread* self, size_t byte_count, AllocatorType allocator_type) { |
| // If we're in a stack overflow, do not create a new exception. It would require running the |
| // constructor, which will of course still be in a stack overflow. |
| if (self->IsHandlingStackOverflow()) { |
| self->SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); |
| return; |
| } |
| |
| std::ostringstream oss; |
| size_t total_bytes_free = GetFreeMemory(); |
| oss << "Failed to allocate a " << byte_count << " byte allocation with " << total_bytes_free |
| << " free bytes and " << PrettySize(GetFreeMemoryUntilOOME()) << " until OOM," |
| << " max allowed footprint " << max_allowed_footprint_ << ", growth limit " |
| << growth_limit_; |
| // If the allocation failed due to fragmentation, print out the largest continuous allocation. |
| if (total_bytes_free >= byte_count) { |
| space::AllocSpace* space = nullptr; |
| if (allocator_type == kAllocatorTypeNonMoving) { |
| space = non_moving_space_; |
| } else if (allocator_type == kAllocatorTypeRosAlloc || |
| allocator_type == kAllocatorTypeDlMalloc) { |
| space = main_space_; |
| } else if (allocator_type == kAllocatorTypeBumpPointer || |
| allocator_type == kAllocatorTypeTLAB) { |
| space = bump_pointer_space_; |
| } else if (allocator_type == kAllocatorTypeRegion || |
| allocator_type == kAllocatorTypeRegionTLAB) { |
| space = region_space_; |
| } |
| if (space != nullptr) { |
| space->LogFragmentationAllocFailure(oss, byte_count); |
| } |
| } |
| self->ThrowOutOfMemoryError(oss.str().c_str()); |
| } |
| |
| void Heap::DoPendingCollectorTransition() { |
| CollectorType desired_collector_type = desired_collector_type_; |
| // Launch homogeneous space compaction if it is desired. |
| if (desired_collector_type == kCollectorTypeHomogeneousSpaceCompact) { |
| if (!CareAboutPauseTimes()) { |
| PerformHomogeneousSpaceCompact(); |
| } else { |
| VLOG(gc) << "Homogeneous compaction ignored due to jank perceptible process state"; |
| } |
| } else if (desired_collector_type == kCollectorTypeCCBackground) { |
| DCHECK(kUseReadBarrier); |
| if (!CareAboutPauseTimes()) { |
| // Invoke CC full compaction. |
| CollectGarbageInternal(collector::kGcTypeFull, |
| kGcCauseCollectorTransition, |
| /*clear_soft_references*/false); |
| } else { |
| VLOG(gc) << "CC background compaction ignored due to jank perceptible process state"; |
| } |
| } else { |
| TransitionCollector(desired_collector_type); |
| } |
| } |
| |
| void Heap::Trim(Thread* self) { |
| Runtime* const runtime = Runtime::Current(); |
| if (!CareAboutPauseTimes()) { |
| // Deflate the monitors, this can cause a pause but shouldn't matter since we don't care |
| // about pauses. |
| ScopedTrace trace("Deflating monitors"); |
| // Avoid race conditions on the lock word for CC. |
| ScopedGCCriticalSection gcs(self, kGcCauseTrim, kCollectorTypeHeapTrim); |
| ScopedSuspendAll ssa(__FUNCTION__); |
| uint64_t start_time = NanoTime(); |
| size_t count = runtime->GetMonitorList()->DeflateMonitors(); |
| VLOG(heap) << "Deflating " << count << " monitors took " |
| << PrettyDuration(NanoTime() - start_time); |
| } |
| TrimIndirectReferenceTables(self); |
| TrimSpaces(self); |
| // Trim arenas that may have been used by JIT or verifier. |
| runtime->GetArenaPool()->TrimMaps(); |
| } |
| |
| class TrimIndirectReferenceTableClosure : public Closure { |
| public: |
| explicit TrimIndirectReferenceTableClosure(Barrier* barrier) : barrier_(barrier) { |
| } |
| virtual void Run(Thread* thread) OVERRIDE NO_THREAD_SAFETY_ANALYSIS { |
| thread->GetJniEnv()->locals.Trim(); |
| // If thread is a running mutator, then act on behalf of the trim thread. |
| // See the code in ThreadList::RunCheckpoint. |
| barrier_->Pass(Thread::Current()); |
| } |
| |
| private: |
| Barrier* const barrier_; |
| }; |
| |
| void Heap::TrimIndirectReferenceTables(Thread* self) { |
| ScopedObjectAccess soa(self); |
| ScopedTrace trace(__PRETTY_FUNCTION__); |
| JavaVMExt* vm = soa.Vm(); |
| // Trim globals indirect reference table. |
| vm->TrimGlobals(); |
| // Trim locals indirect reference tables. |
| Barrier barrier(0); |
| TrimIndirectReferenceTableClosure closure(&barrier); |
| ScopedThreadStateChange tsc(self, kWaitingForCheckPointsToRun); |
| size_t barrier_count = Runtime::Current()->GetThreadList()->RunCheckpoint(&closure); |
| if (barrier_count != 0) { |
| barrier.Increment(self, barrier_count); |
| } |
| } |
| |
| void Heap::StartGC(Thread* self, GcCause cause, CollectorType collector_type) { |
| MutexLock mu(self, *gc_complete_lock_); |
| // Ensure there is only one GC at a time. |
| WaitForGcToCompleteLocked(cause, self); |
| collector_type_running_ = collector_type; |
| thread_running_gc_ = self; |
| } |
| |
| void Heap::TrimSpaces(Thread* self) { |
| { |
| // Need to do this before acquiring the locks since we don't want to get suspended while |
| // holding any locks. |
| ScopedThreadStateChange tsc(self, kWaitingForGcToComplete); |
| // Pretend we are doing a GC to prevent background compaction from deleting the space we are |
| // trimming. |
| StartGC(self, kGcCauseTrim, kCollectorTypeHeapTrim); |
| } |
| ScopedTrace trace(__PRETTY_FUNCTION__); |
| const uint64_t start_ns = NanoTime(); |
| // Trim the managed spaces. |
| uint64_t total_alloc_space_allocated = 0; |
| uint64_t total_alloc_space_size = 0; |
| uint64_t managed_reclaimed = 0; |
| { |
| ScopedObjectAccess soa(self); |
| for (const auto& space : continuous_spaces_) { |
| if (space->IsMallocSpace()) { |
| gc::space::MallocSpace* malloc_space = space->AsMallocSpace(); |
| if (malloc_space->IsRosAllocSpace() || !CareAboutPauseTimes()) { |
| // Don't trim dlmalloc spaces if we care about pauses since this can hold the space lock |
| // for a long period of time. |
| managed_reclaimed += malloc_space->Trim(); |
| } |
| total_alloc_space_size += malloc_space->Size(); |
| } |
| } |
| } |
| total_alloc_space_allocated = GetBytesAllocated(); |
| if (large_object_space_ != nullptr) { |
| total_alloc_space_allocated -= large_object_space_->GetBytesAllocated(); |
| } |
| if (bump_pointer_space_ != nullptr) { |
| total_alloc_space_allocated -= bump_pointer_space_->Size(); |
| } |
| if (region_space_ != nullptr) { |
| total_alloc_space_allocated -= region_space_->GetBytesAllocated(); |
| } |
| const float managed_utilization = static_cast<float>(total_alloc_space_allocated) / |
| static_cast<float>(total_alloc_space_size); |
| uint64_t gc_heap_end_ns = NanoTime(); |
| // We never move things in the native heap, so we can finish the GC at this point. |
| FinishGC(self, collector::kGcTypeNone); |
| |
| VLOG(heap) << "Heap trim of managed (duration=" << PrettyDuration(gc_heap_end_ns - start_ns) |
| << ", advised=" << PrettySize(managed_reclaimed) << ") heap. Managed heap utilization of " |
| << static_cast<int>(100 * managed_utilization) << "%."; |
| } |
| |
| bool Heap::IsValidObjectAddress(const void* addr) const { |
| if (addr == nullptr) { |
| return true; |
| } |
| return IsAligned<kObjectAlignment>(addr) && FindSpaceFromAddress(addr) != nullptr; |
| } |
| |
| bool Heap::IsNonDiscontinuousSpaceHeapAddress(const void* addr) const { |
| return FindContinuousSpaceFromAddress(reinterpret_cast<const mirror::Object*>(addr)) != nullptr; |
| } |
| |
| bool Heap::IsLiveObjectLocked(ObjPtr<mirror::Object> obj, |
| bool search_allocation_stack, |
| bool search_live_stack, |
| bool sorted) { |
| if (UNLIKELY(!IsAligned<kObjectAlignment>(obj.Ptr()))) { |
| return false; |
| } |
| if (bump_pointer_space_ != nullptr && bump_pointer_space_->HasAddress(obj.Ptr())) { |
| mirror::Class* klass = obj->GetClass<kVerifyNone>(); |
| if (obj == klass) { |
| // This case happens for java.lang.Class. |
| return true; |
| } |
| return VerifyClassClass(klass) && IsLiveObjectLocked(klass); |
| } else if (temp_space_ != nullptr && temp_space_->HasAddress(obj.Ptr())) { |
| // If we are in the allocated region of the temp space, then we are probably live (e.g. during |
| // a GC). When a GC isn't running End() - Begin() is 0 which means no objects are contained. |
| return temp_space_->Contains(obj.Ptr()); |
| } |
| if (region_space_ != nullptr && region_space_->HasAddress(obj.Ptr())) { |
| return true; |
| } |
| space::ContinuousSpace* c_space = FindContinuousSpaceFromObject(obj, true); |
| space::DiscontinuousSpace* d_space = nullptr; |
| if (c_space != nullptr) { |
| if (c_space->GetLiveBitmap()->Test(obj.Ptr())) { |
| return true; |
| } |
| } else { |
| d_space = FindDiscontinuousSpaceFromObject(obj, true); |
| if (d_space != nullptr) { |
| if (d_space->GetLiveBitmap()->Test(obj.Ptr())) { |
| return true; |
| } |
| } |
| } |
| // This is covering the allocation/live stack swapping that is done without mutators suspended. |
| for (size_t i = 0; i < (sorted ? 1 : 5); ++i) { |
| if (i > 0) { |
| NanoSleep(MsToNs(10)); |
| } |
| if (search_allocation_stack) { |
| if (sorted) { |
| if (allocation_stack_->ContainsSorted(obj.Ptr())) { |
| return true; |
| } |
| } else if (allocation_stack_->Contains(obj.Ptr())) { |
| return true; |
| } |
| } |
| |
| if (search_live_stack) { |
| if (sorted) { |
| if (live_stack_->ContainsSorted(obj.Ptr())) { |
| return true; |
| } |
| } else if (live_stack_->Contains(obj.Ptr())) { |
| return true; |
| } |
| } |
| } |
| // We need to check the bitmaps again since there is a race where we mark something as live and |
| // then clear the stack containing it. |
| if (c_space != nullptr) { |
| if (c_space->GetLiveBitmap()->Test(obj.Ptr())) { |
| return true; |
| } |
| } else { |
| d_space = FindDiscontinuousSpaceFromObject(obj, true); |
| if (d_space != nullptr && d_space->GetLiveBitmap()->Test(obj.Ptr())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| std::string Heap::DumpSpaces() const { |
| std::ostringstream oss; |
| DumpSpaces(oss); |
| return oss.str(); |
| } |
| |
| void Heap::DumpSpaces(std::ostream& stream) const { |
| for (const auto& space : continuous_spaces_) { |
| accounting::ContinuousSpaceBitmap* live_bitmap = space->GetLiveBitmap(); |
| accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); |
| stream << space << " " << *space << "\n"; |
| if (live_bitmap != nullptr) { |
| stream << live_bitmap << " " << *live_bitmap << "\n"; |
| } |
| if (mark_bitmap != nullptr) { |
| stream << mark_bitmap << " " << *mark_bitmap << "\n"; |
| } |
| } |
| for (const auto& space : discontinuous_spaces_) { |
| stream << space << " " << *space << "\n"; |
| } |
| } |
| |
| void Heap::VerifyObjectBody(ObjPtr<mirror::Object> obj) { |
| if (verify_object_mode_ == kVerifyObjectModeDisabled) { |
| return; |
| } |
| |
| // Ignore early dawn of the universe verifications. |
| if (UNLIKELY(static_cast<size_t>(num_bytes_allocated_.LoadRelaxed()) < 10 * KB)) { |
| return; |
| } |
| CHECK_ALIGNED(obj.Ptr(), kObjectAlignment) << "Object isn't aligned"; |
| mirror::Class* c = obj->GetFieldObject<mirror::Class, kVerifyNone>(mirror::Object::ClassOffset()); |
| CHECK(c != nullptr) << "Null class in object " << obj; |
| CHECK_ALIGNED(c, kObjectAlignment) << "Class " << c << " not aligned in object " << obj; |
| CHECK(VerifyClassClass(c)); |
| |
| if (verify_object_mode_ > kVerifyObjectModeFast) { |
| // Note: the bitmap tests below are racy since we don't hold the heap bitmap lock. |
| CHECK(IsLiveObjectLocked(obj)) << "Object is dead " << obj << "\n" << DumpSpaces(); |
| } |
| } |
| |
| void Heap::VerificationCallback(mirror::Object* obj, void* arg) { |
| reinterpret_cast<Heap*>(arg)->VerifyObjectBody(obj); |
| } |
| |
| void Heap::VerifyHeap() { |
| ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| GetLiveBitmap()->Walk(Heap::VerificationCallback, this); |
| } |
| |
| void Heap::RecordFree(uint64_t freed_objects, int64_t freed_bytes) { |
| // Use signed comparison since freed bytes can be negative when background compaction foreground |
| // transitions occurs. This is caused by the moving objects from a bump pointer space to a |
| // free list backed space typically increasing memory footprint due to padding and binning. |
| DCHECK_LE(freed_bytes, static_cast<int64_t>(num_bytes_allocated_.LoadRelaxed())); |
| // Note: This relies on 2s complement for handling negative freed_bytes. |
| num_bytes_allocated_.FetchAndSubSequentiallyConsistent(static_cast<ssize_t>(freed_bytes)); |
| if (Runtime::Current()->HasStatsEnabled()) { |
| RuntimeStats* thread_stats = Thread::Current()->GetStats(); |
| thread_stats->freed_objects += freed_objects; |
| thread_stats->freed_bytes += freed_bytes; |
| // TODO: Do this concurrently. |
| RuntimeStats* global_stats = Runtime::Current()->GetStats(); |
| global_stats->freed_objects += freed_objects; |
| global_stats->freed_bytes += freed_bytes; |
| } |
| } |
| |
| void Heap::RecordFreeRevoke() { |
| // Subtract num_bytes_freed_revoke_ from num_bytes_allocated_ to cancel out the |
| // the ahead-of-time, bulk counting of bytes allocated in rosalloc thread-local buffers. |
| // If there's a concurrent revoke, ok to not necessarily reset num_bytes_freed_revoke_ |
| // all the way to zero exactly as the remainder will be subtracted at the next GC. |
| size_t bytes_freed = num_bytes_freed_revoke_.LoadSequentiallyConsistent(); |
| CHECK_GE(num_bytes_freed_revoke_.FetchAndSubSequentiallyConsistent(bytes_freed), |
| bytes_freed) << "num_bytes_freed_revoke_ underflow"; |
| CHECK_GE(num_bytes_allocated_.FetchAndSubSequentiallyConsistent(bytes_freed), |
| bytes_freed) << "num_bytes_allocated_ underflow"; |
| GetCurrentGcIteration()->SetFreedRevoke(bytes_freed); |
| } |
| |
| space::RosAllocSpace* Heap::GetRosAllocSpace(gc::allocator::RosAlloc* rosalloc) const { |
| if (rosalloc_space_ != nullptr && rosalloc_space_->GetRosAlloc() == rosalloc) { |
| return rosalloc_space_; |
| } |
| for (const auto& space : continuous_spaces_) { |
| if (space->AsContinuousSpace()->IsRosAllocSpace()) { |
| if (space->AsContinuousSpace()->AsRosAllocSpace()->GetRosAlloc() == rosalloc) { |
| return space->AsContinuousSpace()->AsRosAllocSpace(); |
| } |
| } |
| } |
| return nullptr; |
| } |
| |
| static inline bool EntrypointsInstrumented() REQUIRES_SHARED(Locks::mutator_lock_) { |
| instrumentation::Instrumentation* const instrumentation = |
| Runtime::Current()->GetInstrumentation(); |
| return instrumentation != nullptr && instrumentation->AllocEntrypointsInstrumented(); |
| } |
| |
| mirror::Object* Heap::AllocateInternalWithGc(Thread* self, |
| AllocatorType allocator, |
| bool instrumented, |
| size_t alloc_size, |
| size_t* bytes_allocated, |
| size_t* usable_size, |
| size_t* bytes_tl_bulk_allocated, |
| ObjPtr<mirror::Class>* klass) { |
| bool was_default_allocator = allocator == GetCurrentAllocator(); |
| // Make sure there is no pending exception since we may need to throw an OOME. |
| self->AssertNoPendingException(); |
| DCHECK(klass != nullptr); |
| StackHandleScope<1> hs(self); |
| HandleWrapperObjPtr<mirror::Class> h(hs.NewHandleWrapper(klass)); |
| // The allocation failed. If the GC is running, block until it completes, and then retry the |
| // allocation. |
| collector::GcType last_gc = WaitForGcToComplete(kGcCauseForAlloc, self); |
| // If we were the default allocator but the allocator changed while we were suspended, |
| // abort the allocation. |
| if ((was_default_allocator && allocator != GetCurrentAllocator()) || |
| (!instrumented && EntrypointsInstrumented())) { |
| return nullptr; |
| } |
| if (last_gc != collector::kGcTypeNone) { |
| // A GC was in progress and we blocked, retry allocation now that memory has been freed. |
| mirror::Object* ptr = TryToAllocate<true, false>(self, allocator, alloc_size, bytes_allocated, |
| usable_size, bytes_tl_bulk_allocated); |
| if (ptr != nullptr) { |
| return ptr; |
| } |
| } |
| |
| collector::GcType tried_type = next_gc_type_; |
| const bool gc_ran = |
| CollectGarbageInternal(tried_type, kGcCauseForAlloc, false) != collector::kGcTypeNone; |
| if ((was_default_allocator && allocator != GetCurrentAllocator()) || |
| (!instrumented && EntrypointsInstrumented())) { |
| return nullptr; |
| } |
| if (gc_ran) { |
| mirror::Object* ptr = TryToAllocate<true, false>(self, allocator, alloc_size, bytes_allocated, |
| usable_size, bytes_tl_bulk_allocated); |
| if (ptr != nullptr) { |
| return ptr; |
| } |
| } |
| |
| // Loop through our different Gc types and try to Gc until we get enough free memory. |
| for (collector::GcType gc_type : gc_plan_) { |
| if (gc_type == tried_type) { |
| continue; |
| } |
| // Attempt to run the collector, if we succeed, re-try the allocation. |
| const bool plan_gc_ran = |
| CollectGarbageInternal(gc_type, kGcCauseForAlloc, false) != collector::kGcTypeNone; |
| if ((was_default_allocator && allocator != GetCurrentAllocator()) || |
| (!instrumented && EntrypointsInstrumented())) { |
| return nullptr; |
| } |
| if (plan_gc_ran) { |
| // Did we free sufficient memory for the allocation to succeed? |
| mirror::Object* ptr = TryToAllocate<true, false>(self, allocator, alloc_size, bytes_allocated, |
| usable_size, bytes_tl_bulk_allocated); |
| if (ptr != nullptr) { |
| return ptr; |
| } |
| } |
| } |
| // Allocations have failed after GCs; this is an exceptional state. |
| // Try harder, growing the heap if necessary. |
| mirror::Object* ptr = TryToAllocate<true, true>(self, allocator, alloc_size, bytes_allocated, |
| usable_size, bytes_tl_bulk_allocated); |
| if (ptr != nullptr) { |
| return ptr; |
| } |
| // Most allocations should have succeeded by now, so the heap is really full, really fragmented, |
| // or the requested size is really big. Do another GC, collecting SoftReferences this time. The |
| // VM spec requires that all SoftReferences have been collected and cleared before throwing |
| // OOME. |
| VLOG(gc) << "Forcing collection of SoftReferences for " << PrettySize(alloc_size) |
| << " allocation"; |
| // TODO: Run finalization, but this may cause more allocations to occur. |
| // We don't need a WaitForGcToComplete here either. |
| DCHECK(!gc_plan_.empty()); |
| CollectGarbageInternal(gc_plan_.back(), kGcCauseForAlloc, true); |
| if ((was_default_allocator && allocator != GetCurrentAllocator()) || |
| (!instrumented && EntrypointsInstrumented())) { |
| return nullptr; |
| } |
| ptr = TryToAllocate<true, true>(self, allocator, alloc_size, bytes_allocated, usable_size, |
| bytes_tl_bulk_allocated); |
| if (ptr == nullptr) { |
| const uint64_t current_time = NanoTime(); |
| switch (allocator) { |
| case kAllocatorTypeRosAlloc: |
| // Fall-through. |
| case kAllocatorTypeDlMalloc: { |
| if (use_homogeneous_space_compaction_for_oom_ && |
| current_time - last_time_homogeneous_space_compaction_by_oom_ > |
| min_interval_homogeneous_space_compaction_by_oom_) { |
| last_time_homogeneous_space_compaction_by_oom_ = current_time; |
| HomogeneousSpaceCompactResult result = PerformHomogeneousSpaceCompact(); |
| // Thread suspension could have occurred. |
| if ((was_default_allocator && allocator != GetCurrentAllocator()) || |
| (!instrumented && EntrypointsInstrumented())) { |
| return nullptr; |
| } |
| switch (result) { |
| case HomogeneousSpaceCompactResult::kSuccess: |
| // If the allocation succeeded, we delayed an oom. |
| ptr = TryToAllocate<true, true>(self, allocator, alloc_size, bytes_allocated, |
| usable_size, bytes_tl_bulk_allocated); |
| if (ptr != nullptr) { |
| count_delayed_oom_++; |
| } |
| break; |
| case HomogeneousSpaceCompactResult::kErrorReject: |
| // Reject due to disabled moving GC. |
| break; |
| case HomogeneousSpaceCompactResult::kErrorVMShuttingDown: |
| // Throw OOM by default. |
| break; |
| default: { |
| UNIMPLEMENTED(FATAL) << "homogeneous space compaction result: " |
| << static_cast<size_t>(result); |
| UNREACHABLE(); |
| } |
| } |
| // Always print that we ran homogeneous space compation since this can cause jank. |
| VLOG(heap) << "Ran heap homogeneous space compaction, " |
| << " requested defragmentation " |
| << count_requested_homogeneous_space_compaction_.LoadSequentiallyConsistent() |
| << " performed defragmentation " |
| << count_performed_homogeneous_space_compaction_.LoadSequentiallyConsistent() |
| << " ignored homogeneous space compaction " |
| << count_ignored_homogeneous_space_compaction_.LoadSequentiallyConsistent() |
| << " delayed count = " |
| << count_delayed_oom_.LoadSequentiallyConsistent(); |
| } |
| break; |
| } |
| case kAllocatorTypeNonMoving: { |
| if (kUseReadBarrier) { |
| // DisableMovingGc() isn't compatible with CC. |
| break; |
| } |
| // Try to transition the heap if the allocation failure was due to the space being full. |
| if (!IsOutOfMemoryOnAllocation(allocator, alloc_size, /*grow*/ false)) { |
| // If we aren't out of memory then the OOM was probably from the non moving space being |
| // full. Attempt to disable compaction and turn the main space into a non moving space. |
| DisableMovingGc(); |
| // Thread suspension could have occurred. |
| if ((was_default_allocator && allocator != GetCurrentAllocator()) || |
| (!instrumented && EntrypointsInstrumented())) { |
| return nullptr; |
| } |
| // If we are still a moving GC then something must have caused the transition to fail. |
| if (IsMovingGc(collector_type_)) { |
| MutexLock mu(self, *gc_complete_lock_); |
| // If we couldn't disable moving GC, just throw OOME and return null. |
| LOG(WARNING) << "Couldn't disable moving GC with disable GC count " |
| << disable_moving_gc_count_; |
| } else { |
| LOG(WARNING) << "Disabled moving GC due to the non moving space being full"; |
| ptr = TryToAllocate<true, true>(self, allocator, alloc_size, bytes_allocated, |
| usable_size, bytes_tl_bulk_allocated); |
| } |
| } |
| break; |
| } |
| default: { |
| // Do nothing for others allocators. |
| } |
| } |
| } |
| // If the allocation hasn't succeeded by this point, throw an OOM error. |
| if (ptr == nullptr) { |
| ThrowOutOfMemoryError(self, alloc_size, allocator); |
| } |
| return ptr; |
| } |
| |
| void Heap::SetTargetHeapUtilization(float target) { |
| DCHECK_GT(target, 0.0f); // asserted in Java code |
| DCHECK_LT(target, 1.0f); |
| target_utilization_ = target; |
| } |
| |
| size_t Heap::GetObjectsAllocated() const { |
| Thread* const self = Thread::Current(); |
| ScopedThreadStateChange tsc(self, kWaitingForGetObjectsAllocated); |
| // Prevent GC running during GetObjectsALlocated since we may get a checkpoint request that tells |
| // us to suspend while we are doing SuspendAll. b/35232978 |
| gc::ScopedGCCriticalSection gcs(Thread::Current(), |
| gc::kGcCauseGetObjectsAllocated, |
| gc::kCollectorTypeGetObjectsAllocated); |
| // Need SuspendAll here to prevent lock violation if RosAlloc does it during InspectAll. |
| ScopedSuspendAll ssa(__FUNCTION__); |
| ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| size_t total = 0; |
| for (space::AllocSpace* space : alloc_spaces_) { |
| total += space->GetObjectsAllocated(); |
| } |
| return total; |
| } |
| |
| uint64_t Heap::GetObjectsAllocatedEver() const { |
| uint64_t total = GetObjectsFreedEver(); |
| // If we are detached, we can't use GetObjectsAllocated since we can't change thread states. |
| if (Thread::Current() != nullptr) { |
| total += GetObjectsAllocated(); |
| } |
| return total; |
| } |
| |
| uint64_t Heap::GetBytesAllocatedEver() const { |
| return GetBytesFreedEver() + GetBytesAllocated(); |
| } |
| |
| class InstanceCounter { |
| public: |
| InstanceCounter(const std::vector<Handle<mirror::Class>>& classes, |
| bool use_is_assignable_from, |
| uint64_t* counts) |
| REQUIRES_SHARED(Locks::mutator_lock_) |
| : classes_(classes), use_is_assignable_from_(use_is_assignable_from), counts_(counts) {} |
| |
| static void Callback(mirror::Object* obj, void* arg) |
| REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
| InstanceCounter* instance_counter = reinterpret_cast<InstanceCounter*>(arg); |
| mirror::Class* instance_class = obj->GetClass(); |
| CHECK(instance_class != nullptr); |
| for (size_t i = 0; i < instance_counter->classes_.size(); ++i) { |
| ObjPtr<mirror::Class> klass = instance_counter->classes_[i].Get(); |
| if (instance_counter->use_is_assignable_from_) { |
| if (klass != nullptr && klass->IsAssignableFrom(instance_class)) { |
| ++instance_counter->counts_[i]; |
| } |
| } else if (instance_class == klass) { |
| ++instance_counter->counts_[i]; |
| } |
| } |
| } |
| |
| private: |
| const std::vector<Handle<mirror::Class>>& classes_; |
| bool use_is_assignable_from_; |
| uint64_t* const counts_; |
| DISALLOW_COPY_AND_ASSIGN(InstanceCounter); |
| }; |
| |
| void Heap::CountInstances(const std::vector<Handle<mirror::Class>>& classes, |
| bool use_is_assignable_from, |
| uint64_t* counts) { |
| InstanceCounter counter(classes, use_is_assignable_from, counts); |
| VisitObjects(InstanceCounter::Callback, &counter); |
| } |
| |
| class InstanceCollector { |
| public: |
| InstanceCollector(VariableSizedHandleScope& scope, |
| Handle<mirror::Class> c, |
| int32_t max_count, |
| std::vector<Handle<mirror::Object>>& instances) |
| REQUIRES_SHARED(Locks::mutator_lock_) |
| : scope_(scope), |
| class_(c), |
| max_count_(max_count), |
| instances_(instances) {} |
| |
| static void Callback(mirror::Object* obj, void* arg) |
| REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
| DCHECK(arg != nullptr); |
| InstanceCollector* instance_collector = reinterpret_cast<InstanceCollector*>(arg); |
| if (obj->GetClass() == instance_collector->class_.Get()) { |
| if (instance_collector->max_count_ == 0 || |
| instance_collector->instances_.size() < instance_collector->max_count_) { |
| instance_collector->instances_.push_back(instance_collector->scope_.NewHandle(obj)); |
| } |
| } |
| } |
| |
| private: |
| VariableSizedHandleScope& scope_; |
| Handle<mirror::Class> const class_; |
| const uint32_t max_count_; |
| std::vector<Handle<mirror::Object>>& instances_; |
| DISALLOW_COPY_AND_ASSIGN(InstanceCollector); |
| }; |
| |
| void Heap::GetInstances(VariableSizedHandleScope& scope, |
| Handle<mirror::Class> c, |
| int32_t max_count, |
| std::vector<Handle<mirror::Object>>& instances) { |
| InstanceCollector collector(scope, c, max_count, instances); |
| VisitObjects(&InstanceCollector::Callback, &collector); |
| } |
| |
| class ReferringObjectsFinder { |
| public: |
| ReferringObjectsFinder(VariableSizedHandleScope& scope, |
| Handle<mirror::Object> object, |
| int32_t max_count, |
| std::vector<Handle<mirror::Object>>& referring_objects) |
| REQUIRES_SHARED(Locks::mutator_lock_) |
| : scope_(scope), |
| object_(object), |
| max_count_(max_count), |
| referring_objects_(referring_objects) {} |
| |
| static void Callback(mirror::Object* obj, void* arg) |
| REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
| reinterpret_cast<ReferringObjectsFinder*>(arg)->operator()(obj); |
| } |
| |
| // For bitmap Visit. |
| // TODO: Fix lock analysis to not use NO_THREAD_SAFETY_ANALYSIS, requires support for |
| // annotalysis on visitors. |
| void operator()(ObjPtr<mirror::Object> o) const NO_THREAD_SAFETY_ANALYSIS { |
| o->VisitReferences(*this, VoidFunctor()); |
| } |
| |
| // For Object::VisitReferences. |
| void operator()(ObjPtr<mirror::Object> obj, |
| MemberOffset offset, |
| bool is_static ATTRIBUTE_UNUSED) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| mirror::Object* ref = obj->GetFieldObject<mirror::Object>(offset); |
| if (ref == object_.Get() && (max_count_ == 0 || referring_objects_.size() < max_count_)) { |
| referring_objects_.push_back(scope_.NewHandle(obj)); |
| } |
| } |
| |
| void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED) |
| const {} |
| void VisitRoot(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED) const {} |
| |
| private: |
| VariableSizedHandleScope& scope_; |
| Handle<mirror::Object> const object_; |
| const uint32_t max_count_; |
| std::vector<Handle<mirror::Object>>& referring_objects_; |
| DISALLOW_COPY_AND_ASSIGN(ReferringObjectsFinder); |
| }; |
| |
| void Heap::GetReferringObjects(VariableSizedHandleScope& scope, |
| Handle<mirror::Object> o, |
| int32_t max_count, |
| std::vector<Handle<mirror::Object>>& referring_objects) { |
| ReferringObjectsFinder finder(scope, o, max_count, referring_objects); |
| VisitObjects(&ReferringObjectsFinder::Callback, &finder); |
| } |
| |
| void Heap::CollectGarbage(bool clear_soft_references) { |
| // Even if we waited for a GC we still need to do another GC since weaks allocated during the |
| // last GC will not have necessarily been cleared. |
| CollectGarbageInternal(gc_plan_.back(), kGcCauseExplicit, clear_soft_references); |
| } |
| |
| bool Heap::SupportHomogeneousSpaceCompactAndCollectorTransitions() const { |
| return main_space_backup_.get() != nullptr && main_space_ != nullptr && |
| foreground_collector_type_ == kCollectorTypeCMS; |
| } |
| |
| HomogeneousSpaceCompactResult Heap::PerformHomogeneousSpaceCompact() { |
| Thread* self = Thread::Current(); |
| // Inc requested homogeneous space compaction. |
| count_requested_homogeneous_space_compaction_++; |
| // Store performed homogeneous space compaction at a new request arrival. |
| ScopedThreadStateChange tsc(self, kWaitingPerformingGc); |
| Locks::mutator_lock_->AssertNotHeld(self); |
| { |
| ScopedThreadStateChange tsc2(self, kWaitingForGcToComplete); |
| MutexLock mu(self, *gc_complete_lock_); |
| // Ensure there is only one GC at a time. |
| WaitForGcToCompleteLocked(kGcCauseHomogeneousSpaceCompact, self); |
| // Homogeneous space compaction is a copying transition, can't run it if the moving GC disable count |
| // is non zero. |
| // If the collector type changed to something which doesn't benefit from homogeneous space compaction, |
| // exit. |
| if (disable_moving_gc_count_ != 0 || IsMovingGc(collector_type_) || |
| !main_space_->CanMoveObjects()) { |
| return kErrorReject; |
| } |
| if (!SupportHomogeneousSpaceCompactAndCollectorTransitions()) { |
| return kErrorUnsupported; |
| } |
| collector_type_running_ = kCollectorTypeHomogeneousSpaceCompact; |
| } |
| if (Runtime::Current()->IsShuttingDown(self)) { |
| // Don't allow heap transitions to happen if the runtime is shutting down since these can |
| // cause objects to get finalized. |
| FinishGC(self, collector::kGcTypeNone); |
| return HomogeneousSpaceCompactResult::kErrorVMShuttingDown; |
| } |
| collector::GarbageCollector* collector; |
| { |
| ScopedSuspendAll ssa(__FUNCTION__); |
| uint64_t start_time = NanoTime(); |
| // Launch compaction. |
| space::MallocSpace* to_space = main_space_backup_.release(); |
| space::MallocSpace* from_space = main_space_; |
| to_space->GetMemMap()->Protect(PROT_READ | PROT_WRITE); |
| const uint64_t space_size_before_compaction = from_space->Size(); |
| AddSpace(to_space); |
| // Make sure that we will have enough room to copy. |
| CHECK_GE(to_space->GetFootprintLimit(), from_space->GetFootprintLimit()); |
| collector = Compact(to_space, from_space, kGcCauseHomogeneousSpaceCompact); |
| const uint64_t space_size_after_compaction = to_space->Size(); |
| main_space_ = to_space; |
| main_space_backup_.reset(from_space); |
| RemoveSpace(from_space); |
| SetSpaceAsDefault(main_space_); // Set as default to reset the proper dlmalloc space. |
| // Update performed homogeneous space compaction count. |
| count_performed_homogeneous_space_compaction_++; |
| // Print statics log and resume all threads. |
| uint64_t duration = NanoTime() - start_time; |
| VLOG(heap) << "Heap homogeneous space compaction took " << PrettyDuration(duration) << " size: " |
| << PrettySize(space_size_before_compaction) << " -> " |
| << PrettySize(space_size_after_compaction) << " compact-ratio: " |
| << std::fixed << static_cast<double>(space_size_after_compaction) / |
| static_cast<double>(space_size_before_compaction); |
| } |
| // Finish GC. |
| reference_processor_->EnqueueClearedReferences(self); |
| GrowForUtilization(semi_space_collector_); |
| LogGC(kGcCauseHomogeneousSpaceCompact, collector); |
| FinishGC(self, collector::kGcTypeFull); |
| { |
| ScopedObjectAccess soa(self); |
| soa.Vm()->UnloadNativeLibraries(); |
| } |
| return HomogeneousSpaceCompactResult::kSuccess; |
| } |
| |
| void Heap::TransitionCollector(CollectorType collector_type) { |
| if (collector_type == collector_type_) { |
| return; |
| } |
| // Collector transition must not happen with CC |
| CHECK(!kUseReadBarrier); |
| VLOG(heap) << "TransitionCollector: " << static_cast<int>(collector_type_) |
| << " -> " << static_cast<int>(collector_type); |
| uint64_t start_time = NanoTime(); |
| uint32_t before_allocated = num_bytes_allocated_.LoadSequentiallyConsistent(); |
| Runtime* const runtime = Runtime::Current(); |
| Thread* const self = Thread::Current(); |
| ScopedThreadStateChange tsc(self, kWaitingPerformingGc); |
| Locks::mutator_lock_->AssertNotHeld(self); |
| // Busy wait until we can GC (StartGC can fail if we have a non-zero |
| // compacting_gc_disable_count_, this should rarely occurs). |
| for (;;) { |
| { |
| ScopedThreadStateChange tsc2(self, kWaitingForGcToComplete); |
| MutexLock mu(self, *gc_complete_lock_); |
| // Ensure there is only one GC at a time. |
| WaitForGcToCompleteLocked(kGcCauseCollectorTransition, self); |
| // Currently we only need a heap transition if we switch from a moving collector to a |
| // non-moving one, or visa versa. |
| const bool copying_transition = IsMovingGc(collector_type_) != IsMovingGc(collector_type); |
| // If someone else beat us to it and changed the collector before we could, exit. |
| // This is safe to do before the suspend all since we set the collector_type_running_ before |
| // we exit the loop. If another thread attempts to do the heap transition before we exit, |
| // then it would get blocked on WaitForGcToCompleteLocked. |
| if (collector_type == collector_type_) { |
| return; |
| } |
| // GC can be disabled if someone has a used GetPrimitiveArrayCritical but not yet released. |
| if (!copying_transition || disable_moving_gc_count_ == 0) { |
| // TODO: Not hard code in semi-space collector? |
| collector_type_running_ = copying_transition ? kCollectorTypeSS : collector_type; |
| break; |
| } |
| } |
| usleep(1000); |
| } |
| if (runtime->IsShuttingDown(self)) { |
| // Don't allow heap transitions to happen if the runtime is shutting down since these can |
| // cause objects to get finalized. |
| FinishGC(self, collector::kGcTypeNone); |
| return; |
| } |
| collector::GarbageCollector* collector = nullptr; |
| { |
| ScopedSuspendAll ssa(__FUNCTION__); |
| switch (collector_type) { |
| case kCollectorTypeSS: { |
| if (!IsMovingGc(collector_type_)) { |
| // Create the bump pointer space from the backup space. |
| CHECK(main_space_backup_ != nullptr); |
| std::unique_ptr<MemMap> mem_map(main_space_backup_->ReleaseMemMap()); |
| // We are transitioning from non moving GC -> moving GC, since we copied from the bump |
| // pointer space last transition it will be protected. |
| CHECK(mem_map != nullptr); |
| mem_map->Protect(PROT_READ | PROT_WRITE); |
| bump_pointer_space_ = space::BumpPointerSpace::CreateFromMemMap("Bump pointer space", |
| mem_map.release()); |
| AddSpace(bump_pointer_space_); |
| collector = Compact(bump_pointer_space_, main_space_, kGcCauseCollectorTransition); |
| // Use the now empty main space mem map for the bump pointer temp space. |
| mem_map.reset(main_space_->ReleaseMemMap()); |
| // Unset the pointers just in case. |
| if (dlmalloc_space_ == main_space_) { |
| dlmalloc_space_ = nullptr; |
| } else if (rosalloc_space_ == main_space_) { |
| rosalloc_space_ = nullptr; |
| } |
| // Remove the main space so that we don't try to trim it, this doens't work for debug |
| // builds since RosAlloc attempts to read the magic number from a protected page. |
| RemoveSpace(main_space_); |
| RemoveRememberedSet(main_space_); |
| delete main_space_; // Delete the space since it has been removed. |
| main_space_ = nullptr; |
| RemoveRememberedSet(main_space_backup_.get()); |
| main_space_backup_.reset(nullptr); // Deletes the space. |
| temp_space_ = space::BumpPointerSpace::CreateFromMemMap("Bump pointer space 2", |
| mem_map.release()); |
| AddSpace(temp_space_); |
| } |
| break; |
| } |
| case kCollectorTypeMS: |
| // Fall through. |
| case kCollectorTypeCMS: { |
| if (IsMovingGc(collector_type_)) { |
| CHECK(temp_space_ != nullptr); |
| std::unique_ptr<MemMap> mem_map(temp_space_->ReleaseMemMap()); |
| RemoveSpace(temp_space_); |
| temp_space_ = nullptr; |
| mem_map->Protect(PROT_READ | PROT_WRITE); |
| CreateMainMallocSpace(mem_map.get(), |
| kDefaultInitialSize, |
| std::min(mem_map->Size(), growth_limit_), |
| mem_map->Size()); |
| mem_map.release(); |
| // Compact to the main space from the bump pointer space, don't need to swap semispaces. |
| AddSpace(main_space_); |
| collector = Compact(main_space_, bump_pointer_space_, kGcCauseCollectorTransition); |
| mem_map.reset(bump_pointer_space_->ReleaseMemMap()); |
| RemoveSpace(bump_pointer_space_); |
| bump_pointer_space_ = nullptr; |
| const char* name = kUseRosAlloc ? kRosAllocSpaceName[1] : kDlMallocSpaceName[1]; |
| // Temporarily unprotect the backup mem map so rosalloc can write the debug magic number. |
| if (kIsDebugBuild && kUseRosAlloc) { |
| mem_map->Protect(PROT_READ | PROT_WRITE); |
| } |
| main_space_backup_.reset(CreateMallocSpaceFromMemMap( |
| mem_map.get(), |
| kDefaultInitialSize, |
| std::min(mem_map->Size(), growth_limit_), |
| mem_map->Size(), |
| name, |
| true)); |
| if (kIsDebugBuild && kUseRosAlloc) { |
| mem_map->Protect(PROT_NONE); |
| } |
| mem_map.release(); |
| } |
| break; |
| } |
| default: { |
| LOG(FATAL) << "Attempted to transition to invalid collector type " |
| << static_cast<size_t>(collector_type); |
| break; |
| } |
| } |
| ChangeCollector(collector_type); |
| } |
| // Can't call into java code with all threads suspended. |
| reference_processor_->EnqueueClearedReferences(self); |
| uint64_t duration = NanoTime() - start_time; |
| GrowForUtilization(semi_space_collector_); |
| DCHECK(collector != nullptr); |
| LogGC(kGcCauseCollectorTransition, collector); |
| FinishGC(self, collector::kGcTypeFull); |
| { |
| ScopedObjectAccess soa(self); |
| soa.Vm()->UnloadNativeLibraries(); |
| } |
| int32_t after_allocated = num_bytes_allocated_.LoadSequentiallyConsistent(); |
| int32_t delta_allocated = before_allocated - after_allocated; |
| std::string saved_str; |
| if (delta_allocated >= 0) { |
| saved_str = " saved at least " + PrettySize(delta_allocated); |
| } else { |
| saved_str = " expanded " + PrettySize(-delta_allocated); |
| } |
| VLOG(heap) << "Collector transition to " << collector_type << " took " |
| << PrettyDuration(duration) << saved_str; |
| } |
| |
| void Heap::ChangeCollector(CollectorType collector_type) { |
| // TODO: Only do this with all mutators suspended to avoid races. |
| if (collector_type != collector_type_) { |
| if (collector_type == kCollectorTypeMC) { |
| // Don't allow mark compact unless support is compiled in. |
| CHECK(kMarkCompactSupport); |
| } |
| collector_type_ = collector_type; |
| gc_plan_.clear(); |
| switch (collector_type_) { |
| case kCollectorTypeCC: { |
| gc_plan_.push_back(collector::kGcTypeFull); |
| if (use_tlab_) { |
| ChangeAllocator(kAllocatorTypeRegionTLAB); |
| } else { |
| ChangeAllocator(kAllocatorTypeRegion); |
| } |
| break; |
| } |
| case kCollectorTypeMC: // Fall-through. |
| case kCollectorTypeSS: // Fall-through. |
| case kCollectorTypeGSS: { |
| gc_plan_.push_back(collector::kGcTypeFull); |
| if (use_tlab_) { |
| ChangeAllocator(kAllocatorTypeTLAB); |
| } else { |
| ChangeAllocator(kAllocatorTypeBumpPointer); |
| } |
| break; |
| } |
| case kCollectorTypeMS: { |
| gc_plan_.push_back(collector::kGcTypeSticky); |
| gc_plan_.push_back(collector::kGcTypePartial); |
| gc_plan_.push_back(collector::kGcTypeFull); |
| ChangeAllocator(kUseRosAlloc ? kAllocatorTypeRosAlloc : kAllocatorTypeDlMalloc); |
| break; |
| } |
| case kCollectorTypeCMS: { |
| gc_plan_.push_back(collector::kGcTypeSticky); |
| gc_plan_.push_back(collector::kGcTypePartial); |
| gc_plan_.push_back(collector::kGcTypeFull); |
| ChangeAllocator(kUseRosAlloc ? kAllocatorTypeRosAlloc : kAllocatorTypeDlMalloc); |
| break; |
| } |
| default: { |
| UNIMPLEMENTED(FATAL); |
| UNREACHABLE(); |
| } |
| } |
| if (IsGcConcurrent()) { |
| concurrent_start_bytes_ = |
| std::max(max_allowed_footprint_, kMinConcurrentRemainingBytes) - kMinConcurrentRemainingBytes; |
| } else { |
| concurrent_start_bytes_ = std::numeric_limits<size_t>::max(); |
| } |
| } |
| } |
| |
| // Special compacting collector which uses sub-optimal bin packing to reduce zygote space size. |
| class ZygoteCompactingCollector FINAL : public collector::SemiSpace { |
| public: |
| ZygoteCompactingCollector(gc::Heap* heap, bool is_running_on_memory_tool) |
| : SemiSpace(heap, false, "zygote collector"), |
| bin_live_bitmap_(nullptr), |
| bin_mark_bitmap_(nullptr), |
| is_running_on_memory_tool_(is_running_on_memory_tool) {} |
| |
| void BuildBins(space::ContinuousSpace* space) { |
| bin_live_bitmap_ = space->GetLiveBitmap(); |
| bin_mark_bitmap_ = space->GetMarkBitmap(); |
| BinContext context; |
| context.prev_ = reinterpret_cast<uintptr_t>(space->Begin()); |
| context.collector_ = this; |
| WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| // Note: This requires traversing the space in increasing order of object addresses. |
| bin_live_bitmap_->Walk(Callback, reinterpret_cast<void*>(&context)); |
| // Add the last bin which spans after the last object to the end of the space. |
| AddBin(reinterpret_cast<uintptr_t>(space->End()) - context.prev_, context.prev_); |
| } |
| |
| private: |
| struct BinContext { |
| uintptr_t prev_; // The end of the previous object. |
| ZygoteCompactingCollector* collector_; |
| }; |
| // Maps from bin sizes to locations. |
| std::multimap<size_t, uintptr_t> bins_; |
| // Live bitmap of the space which contains the bins. |
| accounting::ContinuousSpaceBitmap* bin_live_bitmap_; |
| // Mark bitmap of the space which contains the bins. |
| accounting::ContinuousSpaceBitmap* bin_mark_bitmap_; |
| const bool is_running_on_memory_tool_; |
| |
| static void Callback(mirror::Object* obj, void* arg) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| DCHECK(arg != nullptr); |
| BinContext* context = reinterpret_cast<BinContext*>(arg); |
| ZygoteCompactingCollector* collector = context->collector_; |
| uintptr_t object_addr = reinterpret_cast<uintptr_t>(obj); |
| size_t bin_size = object_addr - context->prev_; |
| // Add the bin consisting of the end of the previous object to the start of the current object. |
| collector->AddBin(bin_size, context->prev_); |
| context->prev_ = object_addr + RoundUp(obj->SizeOf<kDefaultVerifyFlags>(), kObjectAlignment); |
| } |
| |
| void AddBin(size_t size, uintptr_t position) { |
| if (is_running_on_memory_tool_) { |
| MEMORY_TOOL_MAKE_DEFINED(reinterpret_cast<void*>(position), size); |
| } |
| if (size != 0) { |
| bins_.insert(std::make_pair(size, position)); |
| } |
| } |
| |
| virtual bool ShouldSweepSpace(space::ContinuousSpace* space ATTRIBUTE_UNUSED) const { |
| // Don't sweep any spaces since we probably blasted the internal accounting of the free list |
| // allocator. |
| return false; |
| } |
| |
| virtual mirror::Object* MarkNonForwardedObject(mirror::Object* obj) |
| REQUIRES(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
| size_t obj_size = obj->SizeOf<kDefaultVerifyFlags>(); |
| size_t alloc_size = RoundUp(obj_size, kObjectAlignment); |
| mirror::Object* forward_address; |
| // Find the smallest bin which we can move obj in. |
| auto it = bins_.lower_bound(alloc_size); |
| if (it == bins_.end()) { |
| // No available space in the bins, place it in the target space instead (grows the zygote |
| // space). |
| size_t bytes_allocated, dummy; |
| forward_address = to_space_->Alloc(self_, alloc_size, &bytes_allocated, nullptr, &dummy); |
| if (to_space_live_bitmap_ != nullptr) { |
| to_space_live_bitmap_->Set(forward_address); |
| } else { |
| GetHeap()->GetNonMovingSpace()->GetLiveBitmap()->Set(forward_address); |
| GetHeap()->GetNonMovingSpace()->GetMarkBitmap()->Set(forward_address); |
| } |
| } else { |
| size_t size = it->first; |
| uintptr_t pos = it->second; |
| bins_.erase(it); // Erase the old bin which we replace with the new smaller bin. |
| forward_address = reinterpret_cast<mirror::Object*>(pos); |
| // Set the live and mark bits so that sweeping system weaks works properly. |
| bin_live_bitmap_->Set(forward_address); |
| bin_mark_bitmap_->Set(forward_address); |
| DCHECK_GE(size, alloc_size); |
| // Add a new bin with the remaining space. |
| AddBin(size - alloc_size, pos + alloc_size); |
| } |
| // Copy the object over to its new location. Don't use alloc_size to avoid valgrind error. |
| memcpy(reinterpret_cast<void*>(forward_address), obj, obj_size); |
| if (kUseBakerReadBarrier) { |
| obj->AssertReadBarrierState(); |
| forward_address->AssertReadBarrierState(); |
| } |
| return forward_address; |
| } |
| }; |
| |
| void Heap::UnBindBitmaps() { |
| TimingLogger::ScopedTiming t("UnBindBitmaps", GetCurrentGcIteration()->GetTimings()); |
| for (const auto& space : GetContinuousSpaces()) { |
| if (space->IsContinuousMemMapAllocSpace()) { |
| space::ContinuousMemMapAllocSpace* alloc_space = space->AsContinuousMemMapAllocSpace(); |
| if (alloc_space->HasBoundBitmaps()) { |
| alloc_space->UnBindBitmaps(); |
| } |
| } |
| } |
| } |
| |
| void Heap::PreZygoteFork() { |
| if (!HasZygoteSpace()) { |
| // We still want to GC in case there is some unreachable non moving objects that could cause a |
| // suboptimal bin packing when we compact the zygote space. |
| CollectGarbageInternal(collector::kGcTypeFull, kGcCauseBackground, false); |
| // Trim the pages at the end of the non moving space. Trim while not holding zygote lock since |
| // the trim process may require locking the mutator lock. |
| non_moving_space_->Trim(); |
| } |
| Thread* self = Thread::Current(); |
| MutexLock mu(self, zygote_creation_lock_); |
| // Try to see if we have any Zygote spaces. |
| if (HasZygoteSpace()) { |
| return; |
| } |
| Runtime::Current()->GetInternTable()->AddNewTable(); |
| Runtime::Current()->GetClassLinker()->MoveClassTableToPreZygote(); |
| VLOG(heap) << "Starting PreZygoteFork"; |
| // The end of the non-moving space may be protected, unprotect it so that we can copy the zygote |
| // there. |
| non_moving_space_->GetMemMap()->Protect(PROT_READ | PROT_WRITE); |
| const bool same_space = non_moving_space_ == main_space_; |
| if (kCompactZygote) { |
| // Temporarily disable rosalloc verification because the zygote |
| // compaction will mess up the rosalloc internal metadata. |
| ScopedDisableRosAllocVerification disable_rosalloc_verif(this); |
| ZygoteCompactingCollector zygote_collector(this, is_running_on_memory_tool_); |
| zygote_collector.BuildBins(non_moving_space_); |
| // Create a new bump pointer space which we will compact into. |
| space::BumpPointerSpace target_space("zygote bump space", non_moving_space_->End(), |
| non_moving_space_->Limit()); |
| // Compact the bump pointer space to a new zygote bump pointer space. |
| bool reset_main_space = false; |
| if (IsMovingGc(collector_type_)) { |
| if (collector_type_ == kCollectorTypeCC) { |
| zygote_collector.SetFromSpace(region_space_); |
| } else { |
| zygote_collector.SetFromSpace(bump_pointer_space_); |
| } |
| } else { |
| CHECK(main_space_ != nullptr); |
| CHECK_NE(main_space_, non_moving_space_) |
| << "Does not make sense to compact within the same space"; |
| // Copy from the main space. |
| zygote_collector.SetFromSpace(main_space_); |
| reset_main_space = true; |
| } |
| zygote_collector.SetToSpace(&target_space); |
| zygote_collector.SetSwapSemiSpaces(false); |
| zygote_collector.Run(kGcCauseCollectorTransition, false); |
| if (reset_main_space) { |
| main_space_->GetMemMap()->Protect(PROT_READ | PROT_WRITE); |
| madvise(main_space_->Begin(), main_space_->Capacity(), MADV_DONTNEED); |
| MemMap* mem_map = main_space_->ReleaseMemMap(); |
| RemoveSpace(main_space_); |
| space::Space* old_main_space = main_space_; |
| CreateMainMallocSpace(mem_map, kDefaultInitialSize, std::min(mem_map->Size(), growth_limit_), |
| mem_map->Size()); |
| delete old_main_space; |
| AddSpace(main_space_); |
| } else { |
| if (collector_type_ == kCollectorTypeCC) { |
| region_space_->GetMemMap()->Protect(PROT_READ | PROT_WRITE); |
| // Evacuated everything out of the region space, clear the mark bitmap. |
| region_space_->GetMarkBitmap()->Clear(); |
| } else { |
| bump_pointer_space_->GetMemMap()->Protect(PROT_READ | PROT_WRITE); |
| } |
| } |
| if (temp_space_ != nullptr) { |
| CHECK(temp_space_->IsEmpty()); |
| } |
| total_objects_freed_ever_ += GetCurrentGcIteration()->GetFreedObjects(); |
| total_bytes_freed_ever_ += GetCurrentGcIteration()->GetFreedBytes(); |
| // Update the end and write out image. |
| non_moving_space_->SetEnd(target_space.End()); |
| non_moving_space_->SetLimit(target_space.Limit()); |
| VLOG(heap) << "Create zygote space with size=" << non_moving_space_->Size() << " bytes"; |
| } |
| // Change the collector to the post zygote one. |
| ChangeCollector(foreground_collector_type_); |
| // Save the old space so that we can remove it after we complete creating the zygote space. |
| space::MallocSpace* old_alloc_space = non_moving_space_; |
| // Turn the current alloc space into a zygote space and obtain the new alloc space composed of |
| // the remaining available space. |
| // Remove the old space before creating the zygote space since creating the zygote space sets |
| // the old alloc space's bitmaps to null. |
| RemoveSpace(old_alloc_space); |
| if (collector::SemiSpace::kUseRememberedSet) { |
| // Sanity bound check. |
| FindRememberedSetFromSpace(old_alloc_space)->AssertAllDirtyCardsAreWithinSpace(); |
| // Remove the remembered set for the now zygote space (the old |
| // non-moving space). Note now that we have compacted objects into |
| // the zygote space, the data in the remembered set is no longer |
| // needed. The zygote space will instead have a mod-union table |
| // from this point on. |
| RemoveRememberedSet(old_alloc_space); |
| } |
| // Remaining space becomes the new non moving space. |
| zygote_space_ = old_alloc_space->CreateZygoteSpace(kNonMovingSpaceName, low_memory_mode_, |
| &non_moving_space_); |
| CHECK(!non_moving_space_->CanMoveObjects()); |
| if (same_space) { |
| main_space_ = non_moving_space_; |
| SetSpaceAsDefault(main_space_); |
| } |
| delete old_alloc_space; |
| CHECK(HasZygoteSpace()) << "Failed creating zygote space"; |
| AddSpace(zygote_space_); |
| non_moving_space_->SetFootprintLimit(non_moving_space_->Capacity()); |
| AddSpace(non_moving_space_); |
| if (kUseBakerReadBarrier && gc::collector::ConcurrentCopying::kGrayDirtyImmuneObjects) { |
| // Treat all of the objects in the zygote as marked to avoid unnecessary dirty pages. This is |
| // safe since we mark all of the objects that may reference non immune objects as gray. |
| zygote_space_->GetLiveBitmap()->VisitMarkedRange( |
| reinterpret_cast<uintptr_t>(zygote_space_->Begin()), |
| reinterpret_cast<uintptr_t>(zygote_space_->Limit()), |
| [](mirror::Object* obj) REQUIRES_SHARED(Locks::mutator_lock_) { |
| CHECK(obj->AtomicSetMarkBit(0, 1)); |
| }); |
| } |
| |
| // Create the zygote space mod union table. |
| accounting::ModUnionTable* mod_union_table = |
| new accounting::ModUnionTableCardCache("zygote space mod-union table", this, zygote_space_); |
| CHECK(mod_union_table != nullptr) << "Failed to create zygote space mod-union table"; |
| |
| if (collector_type_ != kCollectorTypeCC) { |
| // Set all the cards in the mod-union table since we don't know which objects contain references |
| // to large objects. |
| mod_union_table->SetCards(); |
| } else { |
| // Make sure to clear the zygote space cards so that we don't dirty pages in the next GC. There |
| // may be dirty cards from the zygote compaction or reference processing. These cards are not |
| // necessary to have marked since the zygote space may not refer to any objects not in the |
| // zygote or image spaces at this point. |
| mod_union_table->ProcessCards(); |
| mod_union_table->ClearTable(); |
| |
| // For CC we never collect zygote large objects. This means we do not need to set the cards for |
| // the zygote mod-union table and we can also clear all of the existing image mod-union tables. |
| // The existing mod-union tables are only for image spaces and may only reference zygote and |
| // image objects. |
| for (auto& pair : mod_union_tables_) { |
| CHECK(pair.first->IsImageSpace()); |
| CHECK(!pair.first->AsImageSpace()->GetImageHeader().IsAppImage()); |
| accounting::ModUnionTable* table = pair.second; |
| table->ClearTable(); |
| } |
| } |
| AddModUnionTable(mod_union_table); |
| large_object_space_->SetAllLargeObjectsAsZygoteObjects(self); |
| if (collector::SemiSpace::kUseRememberedSet) { |
| // Add a new remembered set for the post-zygote non-moving space. |
| accounting::RememberedSet* post_zygote_non_moving_space_rem_set = |
| new accounting::RememberedSet("Post-zygote non-moving space remembered set", this, |
| non_moving_space_); |
| CHECK(post_zygote_non_moving_space_rem_set != nullptr) |
| << "Failed to create post-zygote non-moving space remembered set"; |
| AddRememberedSet(post_zygote_non_moving_space_rem_set); |
| } |
| } |
| |
| void Heap::FlushAllocStack() { |
| MarkAllocStackAsLive(allocation_stack_.get()); |
| allocation_stack_->Reset(); |
| } |
| |
| void Heap::MarkAllocStack(accounting::ContinuousSpaceBitmap* bitmap1, |
| accounting::ContinuousSpaceBitmap* bitmap2, |
| accounting::LargeObjectBitmap* large_objects, |
| accounting::ObjectStack* stack) { |
| DCHECK(bitmap1 != nullptr); |
| DCHECK(bitmap2 != nullptr); |
| const auto* limit = stack->End(); |
| for (auto* it = stack->Begin(); it != limit; ++it) { |
| const mirror::Object* obj = it->AsMirrorPtr(); |
| if (!kUseThreadLocalAllocationStack || obj != nullptr) { |
| if (bitmap1->HasAddress(obj)) { |
| bitmap1->Set(obj); |
| } else if (bitmap2->HasAddress(obj)) { |
| bitmap2->Set(obj); |
| } else { |
| DCHECK(large_objects != nullptr); |
| large_objects->Set(obj); |
| } |
| } |
| } |
| } |
| |
| void Heap::SwapSemiSpaces() { |
| CHECK(bump_pointer_space_ != nullptr); |
| CHECK(temp_space_ != nullptr); |
| std::swap(bump_pointer_space_, temp_space_); |
| } |
| |
| collector::GarbageCollector* Heap::Compact(space::ContinuousMemMapAllocSpace* target_space, |
| space::ContinuousMemMapAllocSpace* source_space, |
| GcCause gc_cause) { |
| CHECK(kMovingCollector); |
| if (target_space != source_space) { |
| // Don't swap spaces since this isn't a typical semi space collection. |
| semi_space_collector_->SetSwapSemiSpaces(false); |
| semi_space_collector_->SetFromSpace(source_space); |
| semi_space_collector_->SetToSpace(target_space); |
| semi_space_collector_->Run(gc_cause, false); |
| return semi_space_collector_; |
| } else { |
| CHECK(target_space->IsBumpPointerSpace()) |
| << "In-place compaction is only supported for bump pointer spaces"; |
| mark_compact_collector_->SetSpace(target_space->AsBumpPointerSpace()); |
| mark_compact_collector_->Run(kGcCauseCollectorTransition, false); |
| return mark_compact_collector_; |
| } |
| } |
| |
| collector::GcType Heap::CollectGarbageInternal(collector::GcType gc_type, |
| GcCause gc_cause, |
| bool clear_soft_references) { |
| Thread* self = Thread::Current(); |
| Runtime* runtime = Runtime::Current(); |
| // If the heap can't run the GC, silently fail and return that no GC was run. |
| switch (gc_type) { |
| case collector::kGcTypePartial: { |
| if (!HasZygoteSpace()) { |
| return collector::kGcTypeNone; |
| } |
| break; |
| } |
| default: { |
| // Other GC types don't have any special cases which makes them not runnable. The main case |
| // here is full GC. |
| } |
| } |
| ScopedThreadStateChange tsc(self, kWaitingPerformingGc); |
| Locks::mutator_lock_->AssertNotHeld(self); |
| if (self->IsHandlingStackOverflow()) { |
| // If we are throwing a stack overflow error we probably don't have enough remaining stack |
| // space to run the GC. |
| return collector::kGcTypeNone; |
| } |
| bool compacting_gc; |
| { |
| gc_complete_lock_->AssertNotHeld(self); |
| ScopedThreadStateChange tsc2(self, kWaitingForGcToComplete); |
| MutexLock mu(self, *gc_complete_lock_); |
| // Ensure there is only one GC at a time. |
| WaitForGcToCompleteLocked(gc_cause, self); |
| compacting_gc = IsMovingGc(collector_type_); |
| // GC can be disabled if someone has a used GetPrimitiveArrayCritical. |
| if (compacting_gc && disable_moving_gc_count_ != 0) { |
| LOG(WARNING) << "Skipping GC due to disable moving GC count " << disable_moving_gc_count_; |
| return collector::kGcTypeNone; |
| } |
| if (gc_disabled_for_shutdown_) { |
| return collector::kGcTypeNone; |
| } |
| collector_type_running_ = collector_type_; |
| } |
| if (gc_cause == kGcCauseForAlloc && runtime->HasStatsEnabled()) { |
| ++runtime->GetStats()->gc_for_alloc_count; |
| ++self->GetStats()->gc_for_alloc_count; |
| } |
| const uint64_t bytes_allocated_before_gc = GetBytesAllocated(); |
| // Approximate heap size. |
| ATRACE_INT("Heap size (KB)", bytes_allocated_before_gc / KB); |
| |
| if (gc_type == NonStickyGcType()) { |
| // Move all bytes from new_native_bytes_allocated_ to |
| // old_native_bytes_allocated_ now that GC has been triggered, resetting |
| // new_native_bytes_allocated_ to zero in the process. |
| old_native_bytes_allocated_.FetchAndAddRelaxed(new_native_bytes_allocated_.ExchangeRelaxed(0)); |
| } |
| |
| DCHECK_LT(gc_type, collector::kGcTypeMax); |
| DCHECK_NE(gc_type, collector::kGcTypeNone); |
| |
| collector::GarbageCollector* collector = nullptr; |
| // TODO: Clean this up. |
| if (compacting_gc) { |
| DCHECK(current_allocator_ == kAllocatorTypeBumpPointer || |
| current_allocator_ == kAllocatorTypeTLAB || |
| current_allocator_ == kAllocatorTypeRegion || |
| current_allocator_ == kAllocatorTypeRegionTLAB); |
| switch (collector_type_) { |
| case kCollectorTypeSS: |
| // Fall-through. |
| case kCollectorTypeGSS: |
| semi_space_collector_->SetFromSpace(bump_pointer_space_); |
| semi_space_collector_->SetToSpace(temp_space_); |
| semi_space_collector_->SetSwapSemiSpaces(true); |
| collector = semi_space_collector_; |
| break; |
| case kCollectorTypeCC: |
| collector = concurrent_copying_collector_; |
| break; |
| case kCollectorTypeMC: |
| mark_compact_collector_->SetSpace(bump_pointer_space_); |
| collector = mark_compact_collector_; |
| break; |
| default: |
| LOG(FATAL) << "Invalid collector type " << static_cast<size_t>(collector_type_); |
| } |
| if (collector != mark_compact_collector_ && collector != concurrent_copying_collector_) { |
| temp_space_->GetMemMap()->Protect(PROT_READ | PROT_WRITE); |
| if (kIsDebugBuild) { |
| // Try to read each page of the memory map in case mprotect didn't work properly b/19894268. |
| temp_space_->GetMemMap()->TryReadable(); |
| } |
| CHECK(temp_space_->IsEmpty()); |
| } |
| gc_type = collector::kGcTypeFull; // TODO: Not hard code this in. |
| } else if (current_allocator_ == kAllocatorTypeRosAlloc || |
| current_allocator_ == kAllocatorTypeDlMalloc) { |
| collector = FindCollectorByGcType(gc_type); |
| } else { |
| LOG(FATAL) << "Invalid current allocator " << current_allocator_; |
| } |
| if (IsGcConcurrent()) { |
| // Disable concurrent GC check so that we don't have spammy JNI requests. |
| // This gets recalculated in GrowForUtilization. It is important that it is disabled / |
| // calculated in the same thread so that there aren't any races that can cause it to become |
| // permanantly disabled. b/17942071 |
| concurrent_start_bytes_ = std::numeric_limits<size_t>::max(); |
| } |
| |
| CHECK(collector != nullptr) |
| << "Could not find garbage collector with collector_type=" |
| << static_cast<size_t>(collector_type_) << " and gc_type=" << gc_type; |
| collector->Run(gc_cause, clear_soft_references || runtime->IsZygote()); |
| total_objects_freed_ever_ += GetCurrentGcIteration()->GetFreedObjects(); |
| total_bytes_freed_ever_ += GetCurrentGcIteration()->GetFreedBytes(); |
| RequestTrim(self); |
| // Enqueue cleared references. |
| reference_processor_->EnqueueClearedReferences(self); |
| // Grow the heap so that we know when to perform the next GC. |
| GrowForUtilization(collector, bytes_allocated_before_gc); |
| LogGC(gc_cause, collector); |
| FinishGC(self, gc_type); |
| // Inform DDMS that a GC completed. |
| Dbg::GcDidFinish(); |
| // Unload native libraries for class unloading. We do this after calling FinishGC to prevent |
| // deadlocks in case the JNI_OnUnload function does allocations. |
| { |
| ScopedObjectAccess soa(self); |
| soa.Vm()->UnloadNativeLibraries(); |
| } |
| return gc_type; |
| } |
| |
| void Heap::LogGC(GcCause gc_cause, collector::GarbageCollector* collector) { |
| const size_t duration = GetCurrentGcIteration()->GetDurationNs(); |
| const std::vector<uint64_t>& pause_times = GetCurrentGcIteration()->GetPauseTimes(); |
| // Print the GC if it is an explicit GC (e.g. Runtime.gc()) or a slow GC |
| // (mutator time blocked >= long_pause_log_threshold_). |
| bool log_gc = kLogAllGCs || gc_cause == kGcCauseExplicit; |
| if (!log_gc && CareAboutPauseTimes()) { |
| // GC for alloc pauses the allocating thread, so consider it as a pause. |
| log_gc = duration > long_gc_log_threshold_ || |
| (gc_cause == kGcCauseForAlloc && duration > long_pause_log_threshold_); |
| for (uint64_t pause : pause_times) { |
| log_gc = log_gc || pause >= long_pause_log_threshold_; |
| } |
| } |
| if (log_gc) { |
| const size_t percent_free = GetPercentFree(); |
| const size_t current_heap_size = GetBytesAllocated(); |
| const size_t total_memory = GetTotalMemory(); |
| std::ostringstream pause_string; |
| for (size_t i = 0; i < pause_times.size(); ++i) { |
| pause_string << PrettyDuration((pause_times[i] / 1000) * 1000) |
| << ((i != pause_times.size() - 1) ? "," : ""); |
| } |
| LOG(INFO) << gc_cause << " " << collector->GetName() |
| << " GC freed " << current_gc_iteration_.GetFreedObjects() << "(" |
| << PrettySize(current_gc_iteration_.GetFreedBytes()) << ") AllocSpace objects, " |
| << current_gc_iteration_.GetFreedLargeObjects() << "(" |
| << PrettySize(current_gc_iteration_.GetFreedLargeObjectBytes()) << ") LOS objects, " |
| << percent_free << "% free, " << PrettySize(current_heap_size) << "/" |
| << PrettySize(total_memory) << ", " << "paused " << pause_string.str() |
| << " total " << PrettyDuration((duration / 1000) * 1000); |
| VLOG(heap) << Dumpable<TimingLogger>(*current_gc_iteration_.GetTimings()); |
| } |
| } |
| |
| void Heap::FinishGC(Thread* self, collector::GcType gc_type) { |
| MutexLock mu(self, *gc_complete_lock_); |
| collector_type_running_ = kCollectorTypeNone; |
| if (gc_type != collector::kGcTypeNone) { |
| last_gc_type_ = gc_type; |
| |
| // Update stats. |
| ++gc_count_last_window_; |
| if (running_collection_is_blocking_) { |
| // If the currently running collection was a blocking one, |
| // increment the counters and reset the flag. |
| ++blocking_gc_count_; |
| blocking_gc_time_ += GetCurrentGcIteration()->GetDurationNs(); |
| ++blocking_gc_count_last_window_; |
| } |
| // Update the gc count rate histograms if due. |
| UpdateGcCountRateHistograms(); |
| } |
| // Reset. |
| running_collection_is_blocking_ = false; |
| thread_running_gc_ = nullptr; |
| // Wake anyone who may have been waiting for the GC to complete. |
| gc_complete_cond_->Broadcast(self); |
| } |
| |
| void Heap::UpdateGcCountRateHistograms() { |
| // Invariant: if the time since the last update includes more than |
| // one windows, all the GC runs (if > 0) must have happened in first |
| // window because otherwise the update must have already taken place |
| // at an earlier GC run. So, we report the non-first windows with |
| // zero counts to the histograms. |
| DCHECK_EQ(last_update_time_gc_count_rate_histograms_ % kGcCountRateHistogramWindowDuration, 0U); |
| uint64_t now = NanoTime(); |
| DCHECK_GE(now, last_update_time_gc_count_rate_histograms_); |
| uint64_t time_since_last_update = now - last_update_time_gc_count_rate_histograms_; |
| uint64_t num_of_windows = time_since_last_update / kGcCountRateHistogramWindowDuration; |
| if (time_since_last_update >= kGcCountRateHistogramWindowDuration) { |
| // Record the first window. |
| gc_count_rate_histogram_.AddValue(gc_count_last_window_ - 1); // Exclude the current run. |
| blocking_gc_count_rate_histogram_.AddValue(running_collection_is_blocking_ ? |
| blocking_gc_count_last_window_ - 1 : blocking_gc_count_last_window_); |
| // Record the other windows (with zero counts). |
| for (uint64_t i = 0; i < num_of_windows - 1; ++i) { |
| gc_count_rate_histogram_.AddValue(0); |
| blocking_gc_count_rate_histogram_.AddValue(0); |
| } |
| // Update the last update time and reset the counters. |
| last_update_time_gc_count_rate_histograms_ = |
| (now / kGcCountRateHistogramWindowDuration) * kGcCountRateHistogramWindowDuration; |
| gc_count_last_window_ = 1; // Include the current run. |
| blocking_gc_count_last_window_ = running_collection_is_blocking_ ? 1 : 0; |
| } |
| DCHECK_EQ(last_update_time_gc_count_rate_histograms_ % kGcCountRateHistogramWindowDuration, 0U); |
| } |
| |
| class RootMatchesObjectVisitor : public SingleRootVisitor { |
| public: |
| explicit RootMatchesObjectVisitor(const mirror::Object* obj) : obj_(obj) { } |
| |
| void VisitRoot(mirror::Object* root, const RootInfo& info) |
| OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (root == obj_) { |
| LOG(INFO) << "Object " << obj_ << " is a root " << info.ToString(); |
| } |
| } |
| |
| private: |
| const mirror::Object* const obj_; |
| }; |
| |
| |
| class ScanVisitor { |
| public: |
| void operator()(const mirror::Object* obj) const { |
| LOG(ERROR) << "Would have rescanned object " << obj; |
| } |
| }; |
| |
| // Verify a reference from an object. |
| class VerifyReferenceVisitor : public SingleRootVisitor { |
| public: |
| VerifyReferenceVisitor(Heap* heap, Atomic<size_t>* fail_count, bool verify_referent) |
| REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) |
| : heap_(heap), fail_count_(fail_count), verify_referent_(verify_referent) {} |
| |
| size_t GetFailureCount() const { |
| return fail_count_->LoadSequentiallyConsistent(); |
| } |
| |
| void operator()(ObjPtr<mirror::Class> klass ATTRIBUTE_UNUSED, ObjPtr<mirror::Reference> ref) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (verify_referent_) { |
| VerifyReference(ref.Ptr(), ref->GetReferent(), mirror::Reference::ReferentOffset()); |
| } |
| } |
| |
| void operator()(ObjPtr<mirror::Object> obj, |
| MemberOffset offset, |
| bool is_static ATTRIBUTE_UNUSED) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| VerifyReference(obj.Ptr(), obj->GetFieldObject<mirror::Object>(offset), offset); |
| } |
| |
| bool IsLive(ObjPtr<mirror::Object> obj) const NO_THREAD_SAFETY_ANALYSIS { |
| return heap_->IsLiveObjectLocked(obj, true, false, true); |
| } |
| |
| void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (!root->IsNull()) { |
| VisitRoot(root); |
| } |
| } |
| void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| const_cast<VerifyReferenceVisitor*>(this)->VisitRoot( |
| root->AsMirrorPtr(), RootInfo(kRootVMInternal)); |
| } |
| |
| virtual void VisitRoot(mirror::Object* root, const RootInfo& root_info) OVERRIDE |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (root == nullptr) { |
| LOG(ERROR) << "Root is null with info " << root_info.GetType(); |
| } else if (!VerifyReference(nullptr, root, MemberOffset(0))) { |
| LOG(ERROR) << "Root " << root << " is dead with type " << mirror::Object::PrettyTypeOf(root) |
| << " thread_id= " << root_info.GetThreadId() << " root_type= " << root_info.GetType(); |
| } |
| } |
| |
| private: |
| // TODO: Fix the no thread safety analysis. |
| // Returns false on failure. |
| bool VerifyReference(mirror::Object* obj, mirror::Object* ref, MemberOffset offset) const |
| NO_THREAD_SAFETY_ANALYSIS { |
| if (ref == nullptr || IsLive(ref)) { |
| // Verify that the reference is live. |
| return true; |
| } |
| if (fail_count_->FetchAndAddSequentiallyConsistent(1) == 0) { |
| // Print message on only on first failure to prevent spam. |
| LOG(ERROR) << "!!!!!!!!!!!!!!Heap corruption detected!!!!!!!!!!!!!!!!!!!"; |
| } |
| if (obj != nullptr) { |
| // Only do this part for non roots. |
| accounting::CardTable* card_table = heap_->GetCardTable(); |
| accounting::ObjectStack* alloc_stack = heap_->allocation_stack_.get(); |
| accounting::ObjectStack* live_stack = heap_->live_stack_.get(); |
| uint8_t* card_addr = card_table->CardFromAddr(obj); |
| LOG(ERROR) << "Object " << obj << " references dead object " << ref << " at offset " |
| << offset << "\n card value = " << static_cast<int>(*card_addr); |
| if (heap_->IsValidObjectAddress(obj->GetClass())) { |
| LOG(ERROR) << "Obj type " << obj->PrettyTypeOf(); |
| } else { |
| LOG(ERROR) << "Object " << obj << " class(" << obj->GetClass() << ") not a heap address"; |
| } |
| |
| // Attempt to find the class inside of the recently freed objects. |
| space::ContinuousSpace* ref_space = heap_->FindContinuousSpaceFromObject(ref, true); |
| if (ref_space != nullptr && ref_space->IsMallocSpace()) { |
| space::MallocSpace* space = ref_space->AsMallocSpace(); |
| mirror::Class* ref_class = space->FindRecentFreedObject(ref); |
| if (ref_class != nullptr) { |
| LOG(ERROR) << "Reference " << ref << " found as a recently freed object with class " |
| << ref_class->PrettyClass(); |
| } else { |
| LOG(ERROR) << "Reference " << ref << " not found as a recently freed object"; |
| } |
| } |
| |
| if (ref->GetClass() != nullptr && heap_->IsValidObjectAddress(ref->GetClass()) && |
| ref->GetClass()->IsClass()) { |
| LOG(ERROR) << "Ref type " << ref->PrettyTypeOf(); |
| } else { |
| LOG(ERROR) << "Ref " << ref << " class(" << ref->GetClass() |
| << ") is not a valid heap address"; |
| } |
| |
| card_table->CheckAddrIsInCardTable(reinterpret_cast<const uint8_t*>(obj)); |
| void* cover_begin = card_table->AddrFromCard(card_addr); |
| void* cover_end = reinterpret_cast<void*>(reinterpret_cast<size_t>(cover_begin) + |
| accounting::CardTable::kCardSize); |
| LOG(ERROR) << "Card " << reinterpret_cast<void*>(card_addr) << " covers " << cover_begin |
| << "-" << cover_end; |
| accounting::ContinuousSpaceBitmap* bitmap = |
| heap_->GetLiveBitmap()->GetContinuousSpaceBitmap(obj); |
| |
| if (bitmap == nullptr) { |
| LOG(ERROR) << "Object " << obj << " has no bitmap"; |
| if (!VerifyClassClass(obj->GetClass())) { |
| LOG(ERROR) << "Object " << obj << " failed class verification!"; |
| } |
| } else { |
| // Print out how the object is live. |
| if (bitmap->Test(obj)) { |
| LOG(ERROR) << "Object " << obj << " found in live bitmap"; |
| } |
| if (alloc_stack->Contains(const_cast<mirror::Object*>(obj))) { |
| LOG(ERROR) << "Object " << obj << " found in allocation stack"; |
| } |
| if (live_stack->Contains(const_cast<mirror::Object*>(obj))) { |
| LOG(ERROR) << "Object " << obj << " found in live stack"; |
| } |
| if (alloc_stack->Contains(const_cast<mirror::Object*>(ref))) { |
| LOG(ERROR) << "Ref " << ref << " found in allocation stack"; |
| } |
| if (live_stack->Contains(const_cast<mirror::Object*>(ref))) { |
| LOG(ERROR) << "Ref " << ref << " found in live stack"; |
| } |
| // Attempt to see if the card table missed the reference. |
| ScanVisitor scan_visitor; |
| uint8_t* byte_cover_begin = reinterpret_cast<uint8_t*>(card_table->AddrFromCard(card_addr)); |
| card_table->Scan<false>(bitmap, byte_cover_begin, |
| byte_cover_begin + accounting::CardTable::kCardSize, scan_visitor); |
| } |
| |
| // Search to see if any of the roots reference our object. |
| RootMatchesObjectVisitor visitor1(obj); |
| Runtime::Current()->VisitRoots(&visitor1); |
| // Search to see if any of the roots reference our reference. |
| RootMatchesObjectVisitor visitor2(ref); |
| Runtime::Current()->VisitRoots(&visitor2); |
| } |
| return false; |
| } |
| |
| Heap* const heap_; |
| Atomic<size_t>* const fail_count_; |
| const bool verify_referent_; |
| }; |
| |
| // Verify all references within an object, for use with HeapBitmap::Visit. |
| class VerifyObjectVisitor { |
| public: |
| VerifyObjectVisitor(Heap* heap, Atomic<size_t>* fail_count, bool verify_referent) |
| : heap_(heap), fail_count_(fail_count), verify_referent_(verify_referent) {} |
| |
| void operator()(mirror::Object* obj) |
| REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
| // Note: we are verifying the references in obj but not obj itself, this is because obj must |
| // be live or else how did we find it in the live bitmap? |
| VerifyReferenceVisitor visitor(heap_, fail_count_, verify_referent_); |
| // The class doesn't count as a reference but we should verify it anyways. |
| obj->VisitReferences(visitor, visitor); |
| } |
| |
| static void VisitCallback(mirror::Object* obj, void* arg) |
| REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
| VerifyObjectVisitor* visitor = reinterpret_cast<VerifyObjectVisitor*>(arg); |
| visitor->operator()(obj); |
| } |
| |
| void VerifyRoots() REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Locks::heap_bitmap_lock_) { |
| ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| VerifyReferenceVisitor visitor(heap_, fail_count_, verify_referent_); |
| Runtime::Current()->VisitRoots(&visitor); |
| } |
| |
| size_t GetFailureCount() const { |
| return fail_count_->LoadSequentiallyConsistent(); |
| } |
| |
| private: |
| Heap* const heap_; |
| Atomic<size_t>* const fail_count_; |
| const bool verify_referent_; |
| }; |
| |
| void Heap::PushOnAllocationStackWithInternalGC(Thread* self, ObjPtr<mirror::Object>* obj) { |
| // Slow path, the allocation stack push back must have already failed. |
| DCHECK(!allocation_stack_->AtomicPushBack(obj->Ptr())); |
| do { |
| // TODO: Add handle VerifyObject. |
| StackHandleScope<1> hs(self); |
| HandleWrapperObjPtr<mirror::Object> wrapper(hs.NewHandleWrapper(obj)); |
| // Push our object into the reserve region of the allocaiton stack. This is only required due |
| // to heap verification requiring that roots are live (either in the live bitmap or in the |
| // allocation stack). |
| CHECK(allocation_stack_->AtomicPushBackIgnoreGrowthLimit(obj->Ptr())); |
| CollectGarbageInternal(collector::kGcTypeSticky, kGcCauseForAlloc, false); |
| } while (!allocation_stack_->AtomicPushBack(obj->Ptr())); |
| } |
| |
| void Heap::PushOnThreadLocalAllocationStackWithInternalGC(Thread* self, |
| ObjPtr<mirror::Object>* obj) { |
| // Slow path, the allocation stack push back must have already failed. |
| DCHECK(!self->PushOnThreadLocalAllocationStack(obj->Ptr())); |
| StackReference<mirror::Object>* start_address; |
| StackReference<mirror::Object>* end_address; |
| while (!allocation_stack_->AtomicBumpBack(kThreadLocalAllocationStackSize, &start_address, |
| &end_address)) { |
| // TODO: Add handle VerifyObject. |
| StackHandleScope<1> hs(self); |
| HandleWrapperObjPtr<mirror::Object> wrapper(hs.NewHandleWrapper(obj)); |
| // Push our object into the reserve region of the allocaiton stack. This is only required due |
| // to heap verification requiring that roots are live (either in the live bitmap or in the |
| // allocation stack). |
| CHECK(allocation_stack_->AtomicPushBackIgnoreGrowthLimit(obj->Ptr())); |
| // Push into the reserve allocation stack. |
| CollectGarbageInternal(collector::kGcTypeSticky, kGcCauseForAlloc, false); |
| } |
| self->SetThreadLocalAllocationStack(start_address, end_address); |
| // Retry on the new thread-local allocation stack. |
| CHECK(self->PushOnThreadLocalAllocationStack(obj->Ptr())); // Must succeed. |
| } |
| |
| // Must do this with mutators suspended since we are directly accessing the allocation stacks. |
| size_t Heap::VerifyHeapReferences(bool verify_referents) { |
| Thread* self = Thread::Current(); |
| Locks::mutator_lock_->AssertExclusiveHeld(self); |
| // Lets sort our allocation stacks so that we can efficiently binary search them. |
| allocation_stack_->Sort(); |
| live_stack_->Sort(); |
| // Since we sorted the allocation stack content, need to revoke all |
| // thread-local allocation stacks. |
| RevokeAllThreadLocalAllocationStacks(self); |
| Atomic<size_t> fail_count_(0); |
| VerifyObjectVisitor visitor(this, &fail_count_, verify_referents); |
| // Verify objects in the allocation stack since these will be objects which were: |
| // 1. Allocated prior to the GC (pre GC verification). |
| // 2. Allocated during the GC (pre sweep GC verification). |
| // We don't want to verify the objects in the live stack since they themselves may be |
| // pointing to dead objects if they are not reachable. |
| VisitObjectsPaused(VerifyObjectVisitor::VisitCallback, &visitor); |
| // Verify the roots: |
| visitor.VerifyRoots(); |
| if (visitor.GetFailureCount() > 0) { |
| // Dump mod-union tables. |
| for (const auto& table_pair : mod_union_tables_) { |
| accounting::ModUnionTable* mod_union_table = table_pair.second; |
| mod_union_table->Dump(LOG_STREAM(ERROR) << mod_union_table->GetName() << ": "); |
| } |
| // Dump remembered sets. |
| for (const auto& table_pair : remembered_sets_) { |
| accounting::RememberedSet* remembered_set = table_pair.second; |
| remembered_set->Dump(LOG_STREAM(ERROR) << remembered_set->GetName() << ": "); |
| } |
| DumpSpaces(LOG_STREAM(ERROR)); |
| } |
| return visitor.GetFailureCount(); |
| } |
| |
| class VerifyReferenceCardVisitor { |
| public: |
| VerifyReferenceCardVisitor(Heap* heap, bool* failed) |
| REQUIRES_SHARED(Locks::mutator_lock_, |
| Locks::heap_bitmap_lock_) |
| : heap_(heap), failed_(failed) { |
| } |
| |
| // There is no card marks for native roots on a class. |
| void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED) |
| const {} |
| void VisitRoot(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED) const {} |
| |
| // TODO: Fix lock analysis to not use NO_THREAD_SAFETY_ANALYSIS, requires support for |
| // annotalysis on visitors. |
| void operator()(mirror::Object* obj, MemberOffset offset, bool is_static) const |
| NO_THREAD_SAFETY_ANALYSIS { |
| mirror::Object* ref = obj->GetFieldObject<mirror::Object>(offset); |
| // Filter out class references since changing an object's class does not mark the card as dirty. |
| // Also handles large objects, since the only reference they hold is a class reference. |
| if (ref != nullptr && !ref->IsClass()) { |
| accounting::CardTable* card_table = heap_->GetCardTable(); |
| // If the object is not dirty and it is referencing something in the live stack other than |
| // class, then it must be on a dirty card. |
| if (!card_table->AddrIsInCardTable(obj)) { |
| LOG(ERROR) << "Object " << obj << " is not in the address range of the card table"; |
| *failed_ = true; |
| } else if (!card_table->IsDirty(obj)) { |
| // TODO: Check mod-union tables. |
| // Card should be either kCardDirty if it got re-dirtied after we aged it, or |
| // kCardDirty - 1 if it didnt get touched since we aged it. |
| accounting::ObjectStack* live_stack = heap_->live_stack_.get(); |
| if (live_stack->ContainsSorted(ref)) { |
| if (live_stack->ContainsSorted(obj)) { |
| LOG(ERROR) << "Object " << obj << " found in live stack"; |
| } |
| if (heap_->GetLiveBitmap()->Test(obj)) { |
| LOG(ERROR) << "Object " << obj << " found in live bitmap"; |
| } |
| LOG(ERROR) << "Object " << obj << " " << mirror::Object::PrettyTypeOf(obj) |
| << " references " << ref << " " << mirror::Object::PrettyTypeOf(ref) |
| << " in live stack"; |
| |
| // Print which field of the object is dead. |
| if (!obj->IsObjectArray()) { |
| mirror::Class* klass = is_static ? obj->AsClass() : obj->GetClass(); |
| CHECK(klass != nullptr); |
| for (ArtField& field : (is_static ? klass->GetSFields() : klass->GetIFields())) { |
| if (field.GetOffset().Int32Value() == offset.Int32Value()) { |
| LOG(ERROR) << (is_static ? "Static " : "") << "field in the live stack is " |
| << field.PrettyField(); |
| break; |
| } |
| } |
| } else { |
| mirror::ObjectArray<mirror::Object>* object_array = |
| obj->AsObjectArray<mirror::Object>(); |
| for (int32_t i = 0; i < object_array->GetLength(); ++i) { |
| if (object_array->Get(i) == ref) { |
| LOG(ERROR) << (is_static ? "Static " : "") << "obj[" << i << "] = ref"; |
| } |
| } |
| } |
| |
| *failed_ = true; |
| } |
| } |
| } |
| } |
| |
| private: |
| Heap* const heap_; |
| bool* const failed_; |
| }; |
| |
| class VerifyLiveStackReferences { |
| public: |
| explicit VerifyLiveStackReferences(Heap* heap) |
| : heap_(heap), |
| failed_(false) {} |
| |
| void operator()(mirror::Object* obj) const |
| REQUIRES_SHARED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { |
| VerifyReferenceCardVisitor visitor(heap_, const_cast<bool*>(&failed_)); |
| obj->VisitReferences(visitor, VoidFunctor()); |
| } |
| |
| bool Failed() const { |
| return failed_; |
| } |
| |
| private: |
| Heap* const heap_; |
| bool failed_; |
| }; |
| |
| bool Heap::VerifyMissingCardMarks() { |
| Thread* self = Thread::Current(); |
| Locks::mutator_lock_->AssertExclusiveHeld(self); |
| // We need to sort the live stack since we binary search it. |
| live_stack_->Sort(); |
| // Since we sorted the allocation stack content, need to revoke all |
| // thread-local allocation stacks. |
| RevokeAllThreadLocalAllocationStacks(self); |
| VerifyLiveStackReferences visitor(this); |
| GetLiveBitmap()->Visit(visitor); |
| // We can verify objects in the live stack since none of these should reference dead objects. |
| for (auto* it = live_stack_->Begin(); it != live_stack_->End(); ++it) { |
| if (!kUseThreadLocalAllocationStack || it->AsMirrorPtr() != nullptr) { |
| visitor(it->AsMirrorPtr()); |
| } |
| } |
| return !visitor.Failed(); |
| } |
| |
| void Heap::SwapStacks() { |
| if (kUseThreadLocalAllocationStack) { |
| live_stack_->AssertAllZero(); |
| } |
| allocation_stack_.swap(live_stack_); |
| } |
| |
| void Heap::RevokeAllThreadLocalAllocationStacks(Thread* self) { |
| // This must be called only during the pause. |
| DCHECK(Locks::mutator_lock_->IsExclusiveHeld(self)); |
| MutexLock mu(self, *Locks::runtime_shutdown_lock_); |
| MutexLock mu2(self, *Locks::thread_list_lock_); |
| std::list<Thread*> thread_list = Runtime::Current()->GetThreadList()->GetList(); |
| for (Thread* t : thread_list) { |
| t->RevokeThreadLocalAllocationStack(); |
| } |
| } |
| |
| void Heap::AssertThreadLocalBuffersAreRevoked(Thread* thread) { |
| if (kIsDebugBuild) { |
| if (rosalloc_space_ != nullptr) { |
| rosalloc_space_->AssertThreadLocalBuffersAreRevoked(thread); |
| } |
| if (bump_pointer_space_ != nullptr) { |
| bump_pointer_space_->AssertThreadLocalBuffersAreRevoked(thread); |
| } |
| } |
| } |
| |
| void Heap::AssertAllBumpPointerSpaceThreadLocalBuffersAreRevoked() { |
| if (kIsDebugBuild) { |
| if (bump_pointer_space_ != nullptr) { |
| bump_pointer_space_->AssertAllThreadLocalBuffersAreRevoked(); |
| } |
| } |
| } |
| |
| accounting::ModUnionTable* Heap::FindModUnionTableFromSpace(space::Space* space) { |
| auto it = mod_union_tables_.find(space); |
| if (it == mod_union_tables_.end()) { |
| return nullptr; |
| } |
| return it->second; |
| } |
| |
| accounting::RememberedSet* Heap::FindRememberedSetFromSpace(space::Space* space) { |
| auto it = remembered_sets_.find(space); |
| if (it == remembered_sets_.end()) { |
| return nullptr; |
| } |
| return it->second; |
| } |
| |
| void Heap::ProcessCards(TimingLogger* timings, |
| bool use_rem_sets, |
| bool process_alloc_space_cards, |
| bool clear_alloc_space_cards) { |
| TimingLogger::ScopedTiming t(__FUNCTION__, timings); |
| // Clear cards and keep track of cards cleared in the mod-union table. |
| for (const auto& space : continuous_spaces_) { |
| accounting::ModUnionTable* table = FindModUnionTableFromSpace(space); |
| accounting::RememberedSet* rem_set = FindRememberedSetFromSpace(space); |
| if (table != nullptr) { |
| const char* name = space->IsZygoteSpace() ? "ZygoteModUnionClearCards" : |
| "ImageModUnionClearCards"; |
| TimingLogger::ScopedTiming t2(name, timings); |
| table->ProcessCards(); |
| } else if (use_rem_sets && rem_set != nullptr) { |
| DCHECK(collector::SemiSpace::kUseRememberedSet && collector_type_ == kCollectorTypeGSS) |
| << static_cast<int>(collector_type_); |
| TimingLogger::ScopedTiming t2("AllocSpaceRemSetClearCards", timings); |
| rem_set->ClearCards(); |
| } else if (process_alloc_space_cards) { |
| TimingLogger::ScopedTiming t2("AllocSpaceClearCards", timings); |
| if (clear_alloc_space_cards) { |
| uint8_t* end = space->End(); |
| if (space->IsImageSpace()) { |
| // Image space end is the end of the mirror objects, it is not necessarily page or card |
| // aligned. Align up so that the check in ClearCardRange does not fail. |
| end = AlignUp(end, accounting::CardTable::kCardSize); |
| } |
| card_table_->ClearCardRange(space->Begin(), end); |
| } else { |
| // No mod union table for the AllocSpace. Age the cards so that the GC knows that these |
| // cards were dirty before the GC started. |
| // TODO: Need to use atomic for the case where aged(cleaning thread) -> dirty(other thread) |
| // -> clean(cleaning thread). |
| // The races are we either end up with: Aged card, unaged card. Since we have the |
| // checkpoint roots and then we scan / update mod union tables after. We will always |
| // scan either card. If we end up with the non aged card, we scan it it in the pause. |
| card_table_->ModifyCardsAtomic(space->Begin(), space->End(), AgeCardVisitor(), |
| VoidFunctor()); |
| } |
| } |
| } |
| } |
| |
| struct IdentityMarkHeapReferenceVisitor : public MarkObjectVisitor { |
| virtual mirror::Object* MarkObject(mirror::Object* obj) OVERRIDE { |
| return obj; |
| } |
| virtual void MarkHeapReference(mirror::HeapReference<mirror::Object>*, bool) OVERRIDE { |
| } |
| }; |
| |
| void Heap::PreGcVerificationPaused(collector::GarbageCollector* gc) { |
| Thread* const self = Thread::Current(); |
| TimingLogger* const timings = current_gc_iteration_.GetTimings(); |
| TimingLogger::ScopedTiming t(__FUNCTION__, timings); |
| if (verify_pre_gc_heap_) { |
| TimingLogger::ScopedTiming t2("(Paused)PreGcVerifyHeapReferences", timings); |
| size_t failures = VerifyHeapReferences(); |
| if (failures > 0) { |
| LOG(FATAL) << "Pre " << gc->GetName() << " heap verification failed with " << failures |
| << " failures"; |
| } |
| } |
| // Check that all objects which reference things in the live stack are on dirty cards. |
| if (verify_missing_card_marks_) { |
| TimingLogger::ScopedTiming t2("(Paused)PreGcVerifyMissingCardMarks", timings); |
| ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| SwapStacks(); |
| // Sort the live stack so that we can quickly binary search it later. |
| CHECK(VerifyMissingCardMarks()) << "Pre " << gc->GetName() |
| << " missing card mark verification failed\n" << DumpSpaces(); |
| SwapStacks(); |
| } |
| if (verify_mod_union_table_) { |
| TimingLogger::ScopedTiming t2("(Paused)PreGcVerifyModUnionTables", timings); |
| ReaderMutexLock reader_lock(self, *Locks::heap_bitmap_lock_); |
| for (const auto& table_pair : mod_union_tables_) { |
| accounting::ModUnionTable* mod_union_table = table_pair.second; |
| IdentityMarkHeapReferenceVisitor visitor; |
| mod_union_table->UpdateAndMarkReferences(&visitor); |
| mod_union_table->Verify(); |
| } |
| } |
| } |
| |
| void Heap::PreGcVerification(collector::GarbageCollector* gc) { |
| if (verify_pre_gc_heap_ || verify_missing_card_marks_ || verify_mod_union_table_) { |
| collector::GarbageCollector::ScopedPause pause(gc, false); |
| PreGcVerificationPaused(gc); |
| } |
| } |
| |
| void Heap::PrePauseRosAllocVerification(collector::GarbageCollector* gc ATTRIBUTE_UNUSED) { |
| // TODO: Add a new runtime option for this? |
| if (verify_pre_gc_rosalloc_) { |
| RosAllocVerification(current_gc_iteration_.GetTimings(), "PreGcRosAllocVerification"); |
| } |
| } |
| |
| void Heap::PreSweepingGcVerification(collector::GarbageCollector* gc) { |
| Thread* const self = Thread::Current(); |
| TimingLogger* const timings = current_gc_iteration_.GetTimings(); |
| TimingLogger::ScopedTiming t(__FUNCTION__, timings); |
| // Called before sweeping occurs since we want to make sure we are not going so reclaim any |
| // reachable objects. |
| if (verify_pre_sweeping_heap_) { |
| TimingLogger::ScopedTiming t2("(Paused)PostSweepingVerifyHeapReferences", timings); |
| CHECK_NE(self->GetState(), kRunnable); |
| { |
| WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| // Swapping bound bitmaps does nothing. |
| gc->SwapBitmaps(); |
| } |
| // Pass in false since concurrent reference processing can mean that the reference referents |
| // may point to dead objects at the point which PreSweepingGcVerification is called. |
| size_t failures = VerifyHeapReferences(false); |
| if (failures > 0) { |
| LOG(FATAL) << "Pre sweeping " << gc->GetName() << " GC verification failed with " << failures |
| << " failures"; |
| } |
| { |
| WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| gc->SwapBitmaps(); |
| } |
| } |
| if (verify_pre_sweeping_rosalloc_) { |
| RosAllocVerification(timings, "PreSweepingRosAllocVerification"); |
| } |
| } |
| |
| void Heap::PostGcVerificationPaused(collector::GarbageCollector* gc) { |
| // Only pause if we have to do some verification. |
| Thread* const self = Thread::Current(); |
| TimingLogger* const timings = GetCurrentGcIteration()->GetTimings(); |
| TimingLogger::ScopedTiming t(__FUNCTION__, timings); |
| if (verify_system_weaks_) { |
| ReaderMutexLock mu2(self, *Locks::heap_bitmap_lock_); |
| collector::MarkSweep* mark_sweep = down_cast<collector::MarkSweep*>(gc); |
| mark_sweep->VerifySystemWeaks(); |
| } |
| if (verify_post_gc_rosalloc_) { |
| RosAllocVerification(timings, "(Paused)PostGcRosAllocVerification"); |
| } |
| if (verify_post_gc_heap_) { |
| TimingLogger::ScopedTiming t2("(Paused)PostGcVerifyHeapReferences", timings); |
| size_t failures = VerifyHeapReferences(); |
| if (failures > 0) { |
| LOG(FATAL) << "Pre " << gc->GetName() << " heap verification failed with " << failures |
| << " failures"; |
| } |
| } |
| } |
| |
| void Heap::PostGcVerification(collector::GarbageCollector* gc) { |
| if (verify_system_weaks_ || verify_post_gc_rosalloc_ || verify_post_gc_heap_) { |
| collector::GarbageCollector::ScopedPause pause(gc, false); |
| PostGcVerificationPaused(gc); |
| } |
| } |
| |
| void Heap::RosAllocVerification(TimingLogger* timings, const char* name) { |
| TimingLogger::ScopedTiming t(name, timings); |
| for (const auto& space : continuous_spaces_) { |
| if (space->IsRosAllocSpace()) { |
| VLOG(heap) << name << " : " << space->GetName(); |
| space->AsRosAllocSpace()->Verify(); |
| } |
| } |
| } |
| |
| collector::GcType Heap::WaitForGcToComplete(GcCause cause, Thread* self) { |
| ScopedThreadStateChange tsc(self, kWaitingForGcToComplete); |
| MutexLock mu(self, *gc_complete_lock_); |
| return WaitForGcToCompleteLocked(cause, self); |
| } |
| |
| collector::GcType Heap::WaitForGcToCompleteLocked(GcCause cause, Thread* self) { |
| collector::GcType last_gc_type = collector::kGcTypeNone; |
| uint64_t wait_start = NanoTime(); |
| while (collector_type_running_ != kCollectorTypeNone) { |
| if (self != task_processor_->GetRunningThread()) { |
| // The current thread is about to wait for a currently running |
| // collection to finish. If the waiting thread is not the heap |
| // task daemon thread, the currently running collection is |
| // considered as a blocking GC. |
| running_collection_is_blocking_ = true; |
| VLOG(gc) << "Waiting for a blocking GC " << cause; |
| } |
| ScopedTrace trace("GC: Wait For Completion"); |
| // We must wait, change thread state then sleep on gc_complete_cond_; |
| gc_complete_cond_->Wait(self); |
| last_gc_type = last_gc_type_; |
| } |
| uint64_t wait_time = NanoTime() - wait_start; |
| total_wait_time_ += wait_time; |
| if (wait_time > long_pause_log_threshold_) { |
| LOG(INFO) << "WaitForGcToComplete blocked for " << PrettyDuration(wait_time) |
| << " for cause " << cause; |
| } |
| if (self != task_processor_->GetRunningThread()) { |
| // The current thread is about to run a collection. If the thread |
| // is not the heap task daemon thread, it's considered as a |
| // blocking GC (i.e., blocking itself). |
| running_collection_is_blocking_ = true; |
| VLOG(gc) << "Starting a blocking GC " << cause; |
| } |
| return last_gc_type; |
| } |
| |
| void Heap::DumpForSigQuit(std::ostream& os) { |
| os << "Heap: " << GetPercentFree() << "% free, " << PrettySize(GetBytesAllocated()) << "/" |
| << PrettySize(GetTotalMemory()) << "; " << GetObjectsAllocated() << " objects\n"; |
| DumpGcPerformanceInfo(os); |
| } |
| |
| size_t Heap::GetPercentFree() { |
| return static_cast<size_t>(100.0f * static_cast<float>(GetFreeMemory()) / max_allowed_footprint_); |
| } |
| |
| void Heap::SetIdealFootprint(size_t max_allowed_footprint) { |
| if (max_allowed_footprint > GetMaxMemory()) { |
| VLOG(gc) << "Clamp target GC heap from " << PrettySize(max_allowed_footprint) << " to " |
| << PrettySize(GetMaxMemory()); |
| max_allowed_footprint = GetMaxMemory(); |
| } |
| max_allowed_footprint_ = max_allowed_footprint; |
| } |
| |
| bool Heap::IsMovableObject(ObjPtr<mirror::Object> obj) const { |
| if (kMovingCollector) { |
| space::Space* space = FindContinuousSpaceFromObject(obj.Ptr(), true); |
| if (space != nullptr) { |
| // TODO: Check large object? |
| return space->CanMoveObjects(); |
| } |
| } |
| return false; |
| } |
| |
| collector::GarbageCollector* Heap::FindCollectorByGcType(collector::GcType gc_type) { |
| for (const auto& collector : garbage_collectors_) { |
| if (collector->GetCollectorType() == collector_type_ && |
| collector->GetGcType() == gc_type) { |
| return collector; |
| } |
| } |
| return nullptr; |
| } |
| |
| double Heap::HeapGrowthMultiplier() const { |
| // If we don't care about pause times we are background, so return 1.0. |
| if (!CareAboutPauseTimes() || IsLowMemoryMode()) { |
| return 1.0; |
| } |
| return foreground_heap_growth_multiplier_; |
| } |
| |
| void Heap::GrowForUtilization(collector::GarbageCollector* collector_ran, |
| uint64_t bytes_allocated_before_gc) { |
| // We know what our utilization is at this moment. |
| // This doesn't actually resize any memory. It just lets the heap grow more when necessary. |
| const uint64_t bytes_allocated = GetBytesAllocated(); |
| uint64_t target_size; |
| collector::GcType gc_type = collector_ran->GetGcType(); |
| const double multiplier = HeapGrowthMultiplier(); // Use the multiplier to grow more for |
| // foreground. |
| const uint64_t adjusted_min_free = static_cast<uint64_t>(min_free_ * multiplier); |
| const uint64_t adjusted_max_free = static_cast<uint64_t>(max_free_ * multiplier); |
| if (gc_type != collector::kGcTypeSticky) { |
| // Grow the heap for non sticky GC. |
| ssize_t delta = bytes_allocated / GetTargetHeapUtilization() - bytes_allocated; |
| CHECK_GE(delta, 0); |
| target_size = bytes_allocated + delta * multiplier; |
| target_size = std::min(target_size, bytes_allocated + adjusted_max_free); |
| target_size = std::max(target_size, bytes_allocated + adjusted_min_free); |
| next_gc_type_ = collector::kGcTypeSticky; |
| } else { |
| collector::GcType non_sticky_gc_type = NonStickyGcType(); |
| // Find what the next non sticky collector will be. |
| collector::GarbageCollector* non_sticky_collector = FindCollectorByGcType(non_sticky_gc_type); |
| // If the throughput of the current sticky GC >= throughput of the non sticky collector, then |
| // do another sticky collection next. |
| // We also check that the bytes allocated aren't over the footprint limit in order to prevent a |
| // pathological case where dead objects which aren't reclaimed by sticky could get accumulated |
| // if the sticky GC throughput always remained >= the full/partial throughput. |
| if (current_gc_iteration_.GetEstimatedThroughput() * kStickyGcThroughputAdjustment >= |
| non_sticky_collector->GetEstimatedMeanThroughput() && |
| non_sticky_collector->NumberOfIterations() > 0 && |
| bytes_allocated <= max_allowed_footprint_) { |
| next_gc_type_ = collector::kGcTypeSticky; |
| } else { |
| next_gc_type_ = non_sticky_gc_type; |
| } |
| // If we have freed enough memory, shrink the heap back down. |
| if (bytes_allocated + adjusted_max_free < max_allowed_footprint_) { |
| target_size = bytes_allocated + adjusted_max_free; |
| } else { |
| target_size = std::max(bytes_allocated, static_cast<uint64_t>(max_allowed_footprint_)); |
| } |
| } |
| if (!ignore_max_footprint_) { |
| SetIdealFootprint(target_size); |
| if (IsGcConcurrent()) { |
| const uint64_t freed_bytes = current_gc_iteration_.GetFreedBytes() + |
| current_gc_iteration_.GetFreedLargeObjectBytes() + |
| current_gc_iteration_.GetFreedRevokeBytes(); |
| // Bytes allocated will shrink by freed_bytes after the GC runs, so if we want to figure out |
| // how many bytes were allocated during the GC we need to add freed_bytes back on. |
| CHECK_GE(bytes_allocated + freed_bytes, bytes_allocated_before_gc); |
| const uint64_t bytes_allocated_during_gc = bytes_allocated + freed_bytes - |
| bytes_allocated_before_gc; |
| // Calculate when to perform the next ConcurrentGC. |
| // Calculate the estimated GC duration. |
| const double gc_duration_seconds = NsToMs(current_gc_iteration_.GetDurationNs()) / 1000.0; |
| // Estimate how many remaining bytes we will have when we need to start the next GC. |
| size_t remaining_bytes = bytes_allocated_during_gc * gc_duration_seconds; |
| remaining_bytes = std::min(remaining_bytes, kMaxConcurrentRemainingBytes); |
| remaining_bytes = std::max(remaining_bytes, kMinConcurrentRemainingBytes); |
| if (UNLIKELY(remaining_bytes > max_allowed_footprint_)) { |
| // A never going to happen situation that from the estimated allocation rate we will exceed |
| // the applications entire footprint with the given estimated allocation rate. Schedule |
| // another GC nearly straight away. |
| remaining_bytes = kMinConcurrentRemainingBytes; |
| } |
| DCHECK_LE(remaining_bytes, max_allowed_footprint_); |
| DCHECK_LE(max_allowed_footprint_, GetMaxMemory()); |
| // Start a concurrent GC when we get close to the estimated remaining bytes. When the |
| // allocation rate is very high, remaining_bytes could tell us that we should start a GC |
| // right away. |
| concurrent_start_bytes_ = std::max(max_allowed_footprint_ - remaining_bytes, |
| static_cast<size_t>(bytes_allocated)); |
| } |
| } |
| } |
| |
| void Heap::ClampGrowthLimit() { |
| // Use heap bitmap lock to guard against races with BindLiveToMarkBitmap. |
| ScopedObjectAccess soa(Thread::Current()); |
| WriterMutexLock mu(soa.Self(), *Locks::heap_bitmap_lock_); |
| capacity_ = growth_limit_; |
| for (const auto& space : continuous_spaces_) { |
| if (space->IsMallocSpace()) { |
| gc::space::MallocSpace* malloc_space = space->AsMallocSpace(); |
| malloc_space->ClampGrowthLimit(); |
| } |
| } |
| // This space isn't added for performance reasons. |
| if (main_space_backup_.get() != nullptr) { |
| main_space_backup_->ClampGrowthLimit(); |
| } |
| } |
| |
| void Heap::ClearGrowthLimit() { |
| growth_limit_ = capacity_; |
| ScopedObjectAccess soa(Thread::Current()); |
| for (const auto& space : continuous_spaces_) { |
| if (space->IsMallocSpace()) { |
| gc::space::MallocSpace* malloc_space = space->AsMallocSpace(); |
| malloc_space->ClearGrowthLimit(); |
| malloc_space->SetFootprintLimit(malloc_space->Capacity()); |
| } |
| } |
| // This space isn't added for performance reasons. |
| if (main_space_backup_.get() != nullptr) { |
| main_space_backup_->ClearGrowthLimit(); |
| main_space_backup_->SetFootprintLimit(main_space_backup_->Capacity()); |
| } |
| } |
| |
| void Heap::AddFinalizerReference(Thread* self, ObjPtr<mirror::Object>* object) { |
| ScopedObjectAccess soa(self); |
| ScopedLocalRef<jobject> arg(self->GetJniEnv(), soa.AddLocalReference<jobject>(*object)); |
| jvalue args[1]; |
| args[0].l = arg.get(); |
| InvokeWithJValues(soa, nullptr, WellKnownClasses::java_lang_ref_FinalizerReference_add, args); |
| // Restore object in case it gets moved. |
| *object = soa.Decode<mirror::Object>(arg.get()); |
| } |
| |
| void Heap::RequestConcurrentGCAndSaveObject(Thread* self, |
| bool force_full, |
| ObjPtr<mirror::Object>* obj) { |
| StackHandleScope<1> hs(self); |
| HandleWrapperObjPtr<mirror::Object> wrapper(hs.NewHandleWrapper(obj)); |
| RequestConcurrentGC(self, kGcCauseBackground, force_full); |
| } |
| |
| class Heap::ConcurrentGCTask : public HeapTask { |
| public: |
| ConcurrentGCTask(uint64_t target_time, GcCause cause, bool force_full) |
| : HeapTask(target_time), cause_(cause), force_full_(force_full) {} |
| virtual void Run(Thread* self) OVERRIDE { |
| gc::Heap* heap = Runtime::Current()->GetHeap(); |
| heap->ConcurrentGC(self, cause_, force_full_); |
| heap->ClearConcurrentGCRequest(); |
| } |
| |
| private: |
| const GcCause cause_; |
| const bool force_full_; // If true, force full (or partial) collection. |
| }; |
| |
| static bool CanAddHeapTask(Thread* self) REQUIRES(!Locks::runtime_shutdown_lock_) { |
| Runtime* runtime = Runtime::Current(); |
| return runtime != nullptr && runtime->IsFinishedStarting() && !runtime->IsShuttingDown(self) && |
| !self->IsHandlingStackOverflow(); |
| } |
| |
| void Heap::ClearConcurrentGCRequest() { |
| concurrent_gc_pending_.StoreRelaxed(false); |
| } |
| |
| void Heap::RequestConcurrentGC(Thread* self, GcCause cause, bool force_full) { |
| if (CanAddHeapTask(self) && |
| concurrent_gc_pending_.CompareExchangeStrongSequentiallyConsistent(false, true)) { |
| task_processor_->AddTask(self, new ConcurrentGCTask(NanoTime(), // Start straight away. |
| cause, |
| force_full)); |
| } |
| } |
| |
| void Heap::ConcurrentGC(Thread* self, GcCause cause, bool force_full) { |
| if (!Runtime::Current()->IsShuttingDown(self)) { |
| // Wait for any GCs currently running to finish. |
| if (WaitForGcToComplete(cause, self) == collector::kGcTypeNone) { |
| // If the we can't run the GC type we wanted to run, find the next appropriate one and try that |
| // instead. E.g. can't do partial, so do full instead. |
| collector::GcType next_gc_type = next_gc_type_; |
| // If forcing full and next gc type is sticky, override with a non-sticky type. |
| if (force_full && next_gc_type == collector::kGcTypeSticky) { |
| next_gc_type = NonStickyGcType(); |
| } |
| if (CollectGarbageInternal(next_gc_type, cause, false) == collector::kGcTypeNone) { |
| for (collector::GcType gc_type : gc_plan_) { |
| // Attempt to run the collector, if we succeed, we are done. |
| if (gc_type > next_gc_type && |
| CollectGarbageInternal(gc_type, cause, false) != collector::kGcTypeNone) { |
| break; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| class Heap::CollectorTransitionTask : public HeapTask { |
| public: |
| explicit CollectorTransitionTask(uint64_t target_time) : HeapTask(target_time) {} |
| |
| virtual void Run(Thread* self) OVERRIDE { |
| gc::Heap* heap = Runtime::Current()->GetHeap(); |
| heap->DoPendingCollectorTransition(); |
| heap->ClearPendingCollectorTransition(self); |
| } |
| }; |
| |
| void Heap::ClearPendingCollectorTransition(Thread* self) { |
| MutexLock mu(self, *pending_task_lock_); |
| pending_collector_transition_ = nullptr; |
| } |
| |
| void Heap::RequestCollectorTransition(CollectorType desired_collector_type, uint64_t delta_time) { |
| Thread* self = Thread::Current(); |
| desired_collector_type_ = desired_collector_type; |
| if (desired_collector_type_ == collector_type_ || !CanAddHeapTask(self)) { |
| return; |
| } |
| if (collector_type_ == kCollectorTypeCC) { |
| // For CC, we invoke a full compaction when going to the background, but the collector type |
| // doesn't change. |
| DCHECK_EQ(desired_collector_type_, kCollectorTypeCCBackground); |
| } |
| DCHECK_NE(collector_type_, kCollectorTypeCCBackground); |
| CollectorTransitionTask* added_task = nullptr; |
| const uint64_t target_time = NanoTime() + delta_time; |
| { |
| MutexLock mu(self, *pending_task_lock_); |
| // If we have an existing collector transition, update the targe time to be the new target. |
| if (pending_collector_transition_ != nullptr) { |
| task_processor_->UpdateTargetRunTime(self, pending_collector_transition_, target_time); |
| return; |
| } |
| added_task = new CollectorTransitionTask(target_time); |
| pending_collector_transition_ = added_task; |
| } |
| task_processor_->AddTask(self, added_task); |
| } |
| |
| class Heap::HeapTrimTask : public HeapTask { |
| public: |
| explicit HeapTrimTask(uint64_t delta_time) : HeapTask(NanoTime() + delta_time) { } |
| virtual void Run(Thread* self) OVERRIDE { |
| gc::Heap* heap = Runtime::Current()->GetHeap(); |
| heap->Trim(self); |
| heap->ClearPendingTrim(self); |
| } |
| }; |
| |
| void Heap::ClearPendingTrim(Thread* self) { |
| MutexLock mu(self, *pending_task_lock_); |
| pending_heap_trim_ = nullptr; |
| } |
| |
| void Heap::RequestTrim(Thread* self) { |
| if (!CanAddHeapTask(self)) { |
| return; |
| } |
| // GC completed and now we must decide whether to request a heap trim (advising pages back to the |
| // kernel) or not. Issuing a request will also cause trimming of the libc heap. As a trim scans |
| // a space it will hold its lock and can become a cause of jank. |
| // Note, the large object space self trims and the Zygote space was trimmed and unchanging since |
| // forking. |
| |
| // We don't have a good measure of how worthwhile a trim might be. We can't use the live bitmap |
| // because that only marks object heads, so a large array looks like lots of empty space. We |
| // don't just call dlmalloc all the time, because the cost of an _attempted_ trim is proportional |
| // to utilization (which is probably inversely proportional to how much benefit we can expect). |
| // We could try mincore(2) but that's only a measure of how many pages we haven't given away, |
| // not how much use we're making of those pages. |
| HeapTrimTask* added_task = nullptr; |
| { |
| MutexLock mu(self, *pending_task_lock_); |
| if (pending_heap_trim_ != nullptr) { |
| // Already have a heap trim request in task processor, ignore this request. |
| return; |
| } |
| added_task = new HeapTrimTask(kHeapTrimWait); |
| pending_heap_trim_ = added_task; |
| } |
| task_processor_->AddTask(self, added_task); |
| } |
| |
| void Heap::RevokeThreadLocalBuffers(Thread* thread) { |
| if (rosalloc_space_ != nullptr) { |
| size_t freed_bytes_revoke = rosalloc_space_->RevokeThreadLocalBuffers(thread); |
| if (freed_bytes_revoke > 0U) { |
| num_bytes_freed_revoke_.FetchAndAddSequentiallyConsistent(freed_bytes_revoke); |
| CHECK_GE(num_bytes_allocated_.LoadRelaxed(), num_bytes_freed_revoke_.LoadRelaxed()); |
| } |
| } |
| if (bump_pointer_space_ != nullptr) { |
| CHECK_EQ(bump_pointer_space_->RevokeThreadLocalBuffers(thread), 0U); |
| } |
| if (region_space_ != nullptr) { |
| CHECK_EQ(region_space_->RevokeThreadLocalBuffers(thread), 0U); |
| } |
| } |
| |
| void Heap::RevokeRosAllocThreadLocalBuffers(Thread* thread) { |
| if (rosalloc_space_ != nullptr) { |
| size_t freed_bytes_revoke = rosalloc_space_->RevokeThreadLocalBuffers(thread); |
| if (freed_bytes_revoke > 0U) { |
| num_bytes_freed_revoke_.FetchAndAddSequentiallyConsistent(freed_bytes_revoke); |
| CHECK_GE(num_bytes_allocated_.LoadRelaxed(), num_bytes_freed_revoke_.LoadRelaxed()); |
| } |
| } |
| } |
| |
| void Heap::RevokeAllThreadLocalBuffers() { |
| if (rosalloc_space_ != nullptr) { |
| size_t freed_bytes_revoke = rosalloc_space_->RevokeAllThreadLocalBuffers(); |
| if (freed_bytes_revoke > 0U) { |
| num_bytes_freed_revoke_.FetchAndAddSequentiallyConsistent(freed_bytes_revoke); |
| CHECK_GE(num_bytes_allocated_.LoadRelaxed(), num_bytes_freed_revoke_.LoadRelaxed()); |
| } |
| } |
| if (bump_pointer_space_ != nullptr) { |
| CHECK_EQ(bump_pointer_space_->RevokeAllThreadLocalBuffers(), 0U); |
| } |
| if (region_space_ != nullptr) { |
| CHECK_EQ(region_space_->RevokeAllThreadLocalBuffers(), 0U); |
| } |
| } |
| |
| bool Heap::IsGCRequestPending() const { |
| return concurrent_gc_pending_.LoadRelaxed(); |
| } |
| |
| void Heap::RunFinalization(JNIEnv* env, uint64_t timeout) { |
| env->CallStaticVoidMethod(WellKnownClasses::dalvik_system_VMRuntime, |
| WellKnownClasses::dalvik_system_VMRuntime_runFinalization, |
| static_cast<jlong>(timeout)); |
| } |
| |
| void Heap::RegisterNativeAllocation(JNIEnv* env, size_t bytes) { |
| // See the REDESIGN section of go/understanding-register-native-allocation |
| // for an explanation of how RegisterNativeAllocation works. |
| size_t new_value = bytes + new_native_bytes_allocated_.FetchAndAddRelaxed(bytes); |
| if (new_value > NativeAllocationBlockingGcWatermark()) { |
| // Wait for a new GC to finish and finalizers to run, because the |
| // allocation rate is too high. |
| Thread* self = ThreadForEnv(env); |
| |
| bool run_gc = false; |
| { |
| MutexLock mu(self, *native_blocking_gc_lock_); |
| uint32_t initial_gcs_finished = native_blocking_gcs_finished_; |
| if (native_blocking_gc_in_progress_) { |
| // A native blocking GC is in progress from the last time the native |
| // allocation blocking GC watermark was exceeded. Wait for that GC to |
| // finish before addressing the fact that we exceeded the blocking |
| // watermark again. |
| do { |
| native_blocking_gc_cond_->Wait(self); |
| } while (native_blocking_gcs_finished_ == initial_gcs_finished); |
| initial_gcs_finished++; |
| } |
| |
| // It's possible multiple threads have seen that we exceeded the |
| // blocking watermark. Ensure that only one of those threads runs the |
| // blocking GC. The rest of the threads should instead wait for the |
| // blocking GC to complete. |
| if (native_blocking_gcs_finished_ == initial_gcs_finished) { |
| if (native_blocking_gc_in_progress_) { |
| do { |
| native_blocking_gc_cond_->Wait(self); |
| } while (native_blocking_gcs_finished_ == initial_gcs_finished); |
| } else { |
| native_blocking_gc_in_progress_ = true; |
| run_gc = true; |
| } |
| } |
| } |
| |
| if (run_gc) { |
| CollectGarbageInternal(NonStickyGcType(), kGcCauseForNativeAlloc, false); |
| RunFinalization(env, kNativeAllocationFinalizeTimeout); |
| CHECK(!env->ExceptionCheck()); |
| |
| MutexLock mu(self, *native_blocking_gc_lock_); |
| native_blocking_gc_in_progress_ = false; |
| native_blocking_gcs_finished_++; |
| native_blocking_gc_cond_->Broadcast(self); |
| } |
| } else if (new_value > NativeAllocationGcWatermark() && !IsGCRequestPending()) { |
| // Trigger another GC because there have been enough native bytes |
| // allocated since the last GC. |
| if (IsGcConcurrent()) { |
| RequestConcurrentGC(ThreadForEnv(env), kGcCauseForNativeAllocBackground, /*force_full*/true); |
| } else { |
| CollectGarbageInternal(NonStickyGcType(), kGcCauseForNativeAlloc, false); |
| } |
| } |
| } |
| |
| void Heap::RegisterNativeFree(JNIEnv*, size_t bytes) { |
| // Take the bytes freed out of new_native_bytes_allocated_ first. If |
| // new_native_bytes_allocated_ reaches zero, take the remaining bytes freed |
| // out of old_native_bytes_allocated_ to ensure all freed bytes are |
| // accounted for. |
| size_t allocated; |
| size_t new_freed_bytes; |
| do { |
| allocated = new_native_bytes_allocated_.LoadRelaxed(); |
| new_freed_bytes = std::min(allocated, bytes); |
| } while (!new_native_bytes_allocated_.CompareExchangeWeakRelaxed(allocated, |
| allocated - new_freed_bytes)); |
| if (new_freed_bytes < bytes) { |
| old_native_bytes_allocated_.FetchAndSubRelaxed(bytes - new_freed_bytes); |
| } |
| } |
| |
| size_t Heap::GetTotalMemory() const { |
| return std::max(max_allowed_footprint_, GetBytesAllocated()); |
| } |
| |
| void Heap::AddModUnionTable(accounting::ModUnionTable* mod_union_table) { |
| DCHECK(mod_union_table != nullptr); |
| mod_union_tables_.Put(mod_union_table->GetSpace(), mod_union_table); |
| } |
| |
| void Heap::CheckPreconditionsForAllocObject(ObjPtr<mirror::Class> c, size_t byte_count) { |
| CHECK(c == nullptr || (c->IsClassClass() && byte_count >= sizeof(mirror::Class)) || |
| (c->IsVariableSize() || c->GetObjectSize() == byte_count)) |
| << "ClassFlags=" << c->GetClassFlags() |
| << " IsClassClass=" << c->IsClassClass() |
| << " byte_count=" << byte_count |
| << " IsVariableSize=" << c->IsVariableSize() |
| << " ObjectSize=" << c->GetObjectSize() |
| << " sizeof(Class)=" << sizeof(mirror::Class) |
| << " klass=" << c.Ptr(); |
| CHECK_GE(byte_count, sizeof(mirror::Object)); |
| } |
| |
| void Heap::AddRememberedSet(accounting::RememberedSet* remembered_set) { |
| CHECK(remembered_set != nullptr); |
| space::Space* space = remembered_set->GetSpace(); |
| CHECK(space != nullptr); |
| CHECK(remembered_sets_.find(space) == remembered_sets_.end()) << space; |
| remembered_sets_.Put(space, remembered_set); |
| CHECK(remembered_sets_.find(space) != remembered_sets_.end()) << space; |
| } |
| |
| void Heap::RemoveRememberedSet(space::Space* space) { |
| CHECK(space != nullptr); |
| auto it = remembered_sets_.find(space); |
| CHECK(it != remembered_sets_.end()); |
| delete it->second; |
| remembered_sets_.erase(it); |
| CHECK(remembered_sets_.find(space) == remembered_sets_.end()); |
| } |
| |
| void Heap::ClearMarkedObjects() { |
| // Clear all of the spaces' mark bitmaps. |
| for (const auto& space : GetContinuousSpaces()) { |
| accounting::ContinuousSpaceBitmap* mark_bitmap = space->GetMarkBitmap(); |
| if (space->GetLiveBitmap() != mark_bitmap) { |
| mark_bitmap->Clear(); |
| } |
| } |
| // Clear the marked objects in the discontinous space object sets. |
| for (const auto& space : GetDiscontinuousSpaces()) { |
| space->GetMarkBitmap()->Clear(); |
| } |
| } |
| |
| void Heap::SetAllocationRecords(AllocRecordObjectMap* records) { |
| allocation_records_.reset(records); |
| } |
| |
| void Heap::VisitAllocationRecords(RootVisitor* visitor) const { |
| if (IsAllocTrackingEnabled()) { |
| MutexLock mu(Thread::Current(), *Locks::alloc_tracker_lock_); |
| if (IsAllocTrackingEnabled()) { |
| GetAllocationRecords()->VisitRoots(visitor); |
| } |
| } |
| } |
| |
| void Heap::SweepAllocationRecords(IsMarkedVisitor* visitor) const { |
| if (IsAllocTrackingEnabled()) { |
| MutexLock mu(Thread::Current(), *Locks::alloc_tracker_lock_); |
| if (IsAllocTrackingEnabled()) { |
| GetAllocationRecords()->SweepAllocationRecords(visitor); |
| } |
| } |
| } |
| |
| void Heap::AllowNewAllocationRecords() const { |
| CHECK(!kUseReadBarrier); |
| MutexLock mu(Thread::Current(), *Locks::alloc_tracker_lock_); |
| AllocRecordObjectMap* allocation_records = GetAllocationRecords(); |
| if (allocation_records != nullptr) { |
| allocation_records->AllowNewAllocationRecords(); |
| } |
| } |
| |
| void Heap::DisallowNewAllocationRecords() const { |
| CHECK(!kUseReadBarrier); |
| MutexLock mu(Thread::Current(), *Locks::alloc_tracker_lock_); |
| AllocRecordObjectMap* allocation_records = GetAllocationRecords(); |
| if (allocation_records != nullptr) { |
| allocation_records->DisallowNewAllocationRecords(); |
| } |
| } |
| |
| void Heap::BroadcastForNewAllocationRecords() const { |
| // Always broadcast without checking IsAllocTrackingEnabled() because IsAllocTrackingEnabled() may |
| // be set to false while some threads are waiting for system weak access in |
| // AllocRecordObjectMap::RecordAllocation() and we may fail to wake them up. b/27467554. |
| MutexLock mu(Thread::Current(), *Locks::alloc_tracker_lock_); |
| AllocRecordObjectMap* allocation_records = GetAllocationRecords(); |
| if (allocation_records != nullptr) { |
| allocation_records->BroadcastForNewAllocationRecords(); |
| } |
| } |
| |
| void Heap::CheckGcStressMode(Thread* self, ObjPtr<mirror::Object>* obj) { |
| auto* const runtime = Runtime::Current(); |
| if (gc_stress_mode_ && runtime->GetClassLinker()->IsInitialized() && |
| !runtime->IsActiveTransaction() && mirror::Class::HasJavaLangClass()) { |
| // Check if we should GC. |
| bool new_backtrace = false; |
| { |
| static constexpr size_t kMaxFrames = 16u; |
| FixedSizeBacktrace<kMaxFrames> backtrace; |
| backtrace.Collect(/* skip_frames */ 2); |
| uint64_t hash = backtrace.Hash(); |
| MutexLock mu(self, *backtrace_lock_); |
| new_backtrace = seen_backtraces_.find(hash) == seen_backtraces_.end(); |
| if (new_backtrace) { |
| seen_backtraces_.insert(hash); |
| } |
| } |
| if (new_backtrace) { |
| StackHandleScope<1> hs(self); |
| auto h = hs.NewHandleWrapper(obj); |
| CollectGarbage(false); |
| unique_backtrace_count_.FetchAndAddSequentiallyConsistent(1); |
| } else { |
| seen_backtrace_count_.FetchAndAddSequentiallyConsistent(1); |
| } |
| } |
| } |
| |
| void Heap::DisableGCForShutdown() { |
| Thread* const self = Thread::Current(); |
| CHECK(Runtime::Current()->IsShuttingDown(self)); |
| MutexLock mu(self, *gc_complete_lock_); |
| gc_disabled_for_shutdown_ = true; |
| } |
| |
| bool Heap::ObjectIsInBootImageSpace(ObjPtr<mirror::Object> obj) const { |
| for (gc::space::ImageSpace* space : boot_image_spaces_) { |
| if (space->HasAddress(obj.Ptr())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool Heap::IsInBootImageOatFile(const void* p) const { |
| for (gc::space::ImageSpace* space : boot_image_spaces_) { |
| if (space->GetOatFile()->Contains(p)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void Heap::GetBootImagesSize(uint32_t* boot_image_begin, |
| uint32_t* boot_image_end, |
| uint32_t* boot_oat_begin, |
| uint32_t* boot_oat_end) { |
| DCHECK(boot_image_begin != nullptr); |
| DCHECK(boot_image_end != nullptr); |
| DCHECK(boot_oat_begin != nullptr); |
| DCHECK(boot_oat_end != nullptr); |
| *boot_image_begin = 0u; |
| *boot_image_end = 0u; |
| *boot_oat_begin = 0u; |
| *boot_oat_end = 0u; |
| for (gc::space::ImageSpace* space_ : GetBootImageSpaces()) { |
| const uint32_t image_begin = PointerToLowMemUInt32(space_->Begin()); |
| const uint32_t image_size = space_->GetImageHeader().GetImageSize(); |
| if (*boot_image_begin == 0 || image_begin < *boot_image_begin) { |
| *boot_image_begin = image_begin; |
| } |
| *boot_image_end = std::max(*boot_image_end, image_begin + image_size); |
| const OatFile* boot_oat_file = space_->GetOatFile(); |
| const uint32_t oat_begin = PointerToLowMemUInt32(boot_oat_file->Begin()); |
| const uint32_t oat_size = boot_oat_file->Size(); |
| if (*boot_oat_begin == 0 || oat_begin < *boot_oat_begin) { |
| *boot_oat_begin = oat_begin; |
| } |
| *boot_oat_end = std::max(*boot_oat_end, oat_begin + oat_size); |
| } |
| } |
| |
| void Heap::SetAllocationListener(AllocationListener* l) { |
| AllocationListener* old = GetAndOverwriteAllocationListener(&alloc_listener_, l); |
| |
| if (old == nullptr) { |
| Runtime::Current()->GetInstrumentation()->InstrumentQuickAllocEntryPoints(); |
| } |
| } |
| |
| void Heap::RemoveAllocationListener() { |
| AllocationListener* old = GetAndOverwriteAllocationListener(&alloc_listener_, nullptr); |
| |
| if (old != nullptr) { |
| Runtime::Current()->GetInstrumentation()->UninstrumentQuickAllocEntryPoints(); |
| } |
| } |
| |
| void Heap::SetGcPauseListener(GcPauseListener* l) { |
| gc_pause_listener_.StoreRelaxed(l); |
| } |
| |
| void Heap::RemoveGcPauseListener() { |
| gc_pause_listener_.StoreRelaxed(nullptr); |
| } |
| |
| mirror::Object* Heap::AllocWithNewTLAB(Thread* self, |
| size_t alloc_size, |
| bool grow, |
| size_t* bytes_allocated, |
| size_t* usable_size, |
| size_t* bytes_tl_bulk_allocated) { |
| const AllocatorType allocator_type = GetCurrentAllocator(); |
| if (kUsePartialTlabs && alloc_size <= self->TlabRemainingCapacity()) { |
| DCHECK_GT(alloc_size, self->TlabSize()); |
| // There is enough space if we grow the TLAB. Lets do that. This increases the |
| // TLAB bytes. |
| const size_t min_expand_size = alloc_size - self->TlabSize(); |
| const size_t expand_bytes = std::max( |
| min_expand_size, |
| std::min(self->TlabRemainingCapacity() - self->TlabSize(), kPartialTlabSize)); |
| if (UNLIKELY(IsOutOfMemoryOnAllocation(allocator_type, expand_bytes, grow))) { |
| return nullptr; |
| } |
| *bytes_tl_bulk_allocated = expand_bytes; |
| self->ExpandTlab(expand_bytes); |
| DCHECK_LE(alloc_size, self->TlabSize()); |
| } else if (allocator_type == kAllocatorTypeTLAB) { |
| DCHECK(bump_pointer_space_ != nullptr); |
| const size_t new_tlab_size = alloc_size + kDefaultTLABSize; |
| if (UNLIKELY(IsOutOfMemoryOnAllocation(allocator_type, new_tlab_size, grow))) { |
| return nullptr; |
| } |
| // Try allocating a new thread local buffer, if the allocation fails the space must be |
| // full so return null. |
| if (!bump_pointer_space_->AllocNewTlab(self, new_tlab_size)) { |
| return nullptr; |
| } |
| *bytes_tl_bulk_allocated = new_tlab_size; |
| } else { |
| DCHECK(allocator_type == kAllocatorTypeRegionTLAB); |
| DCHECK(region_space_ != nullptr); |
| if (space::RegionSpace::kRegionSize >= alloc_size) { |
| // Non-large. Check OOME for a tlab. |
| if (LIKELY(!IsOutOfMemoryOnAllocation(allocator_type, |
| space::RegionSpace::kRegionSize, |
| grow))) { |
| const size_t new_tlab_size = kUsePartialTlabs |
| ? std::max(alloc_size, kPartialTlabSize) |
| : gc::space::RegionSpace::kRegionSize; |
| // Try to allocate a tlab. |
| if (!region_space_->AllocNewTlab(self, new_tlab_size)) { |
| // Failed to allocate a tlab. Try non-tlab. |
| return region_space_->AllocNonvirtual<false>(alloc_size, |
| bytes_allocated, |
| usable_size, |
| bytes_tl_bulk_allocated); |
| } |
| *bytes_tl_bulk_allocated = new_tlab_size; |
| // Fall-through to using the TLAB below. |
| } else { |
| // Check OOME for a non-tlab allocation. |
| if (!IsOutOfMemoryOnAllocation(allocator_type, alloc_size, grow)) { |
| return region_space_->AllocNonvirtual<false>(alloc_size, |
| bytes_allocated, |
| usable_size, |
| bytes_tl_bulk_allocated); |
| } |
| // Neither tlab or non-tlab works. Give up. |
| return nullptr; |
| } |
| } else { |
| // Large. Check OOME. |
| if (LIKELY(!IsOutOfMemoryOnAllocation(allocator_type, alloc_size, grow))) { |
| return region_space_->AllocNonvirtual<false>(alloc_size, |
| bytes_allocated, |
| usable_size, |
| bytes_tl_bulk_allocated); |
| } |
| return nullptr; |
| } |
| } |
| // Refilled TLAB, return. |
| mirror::Object* ret = self->AllocTlab(alloc_size); |
| DCHECK(ret != nullptr); |
| *bytes_allocated = alloc_size; |
| *usable_size = alloc_size; |
| return ret; |
| } |
| |
| const Verification* Heap::GetVerification() const { |
| return verification_.get(); |
| } |
| |
| } // namespace gc |
| } // namespace art |