| /* |
| * Copyright (c) 2014, 2023, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/g1/g1Allocator.inline.hpp" |
| #include "gc/g1/g1CollectedHeap.inline.hpp" |
| #include "gc/g1/g1CollectionSet.hpp" |
| #include "gc/g1/g1EvacFailureRegions.inline.hpp" |
| #include "gc/g1/g1OopClosures.inline.hpp" |
| #include "gc/g1/g1ParScanThreadState.inline.hpp" |
| #include "gc/g1/g1RootClosures.hpp" |
| #include "gc/g1/g1StringDedup.hpp" |
| #include "gc/g1/g1Trace.hpp" |
| #include "gc/g1/g1YoungGCEvacFailureInjector.inline.hpp" |
| #include "gc/shared/continuationGCSupport.inline.hpp" |
| #include "gc/shared/partialArrayTaskStepper.inline.hpp" |
| #include "gc/shared/preservedMarks.inline.hpp" |
| #include "gc/shared/stringdedup/stringDedup.hpp" |
| #include "gc/shared/taskqueue.inline.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "oops/access.inline.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/prefetch.inline.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| #include "utilities/macros.hpp" |
| |
| // In fastdebug builds the code size can get out of hand, potentially |
| // tripping over compiler limits (which may be bugs, but nevertheless |
| // need to be taken into consideration). A side benefit of limiting |
| // inlining is that we get more call frames that might aid debugging. |
| // And the fastdebug compile time for this file is much reduced. |
| // Explicit NOINLINE to block ATTRIBUTE_FLATTENing. |
| #define MAYBE_INLINE_EVACUATION NOT_DEBUG(inline) DEBUG_ONLY(NOINLINE) |
| |
| G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, |
| G1RedirtyCardsQueueSet* rdcqs, |
| PreservedMarks* preserved_marks, |
| uint worker_id, |
| uint num_workers, |
| G1CollectionSet* collection_set, |
| G1EvacFailureRegions* evac_failure_regions) |
| : _g1h(g1h), |
| _task_queue(g1h->task_queue(worker_id)), |
| _rdc_local_qset(rdcqs), |
| _ct(g1h->card_table()), |
| _closures(nullptr), |
| _plab_allocator(nullptr), |
| _age_table(false), |
| _tenuring_threshold(g1h->policy()->tenuring_threshold()), |
| _scanner(g1h, this), |
| _worker_id(worker_id), |
| _last_enqueued_card(SIZE_MAX), |
| _stack_trim_upper_threshold(GCDrainStackTargetSize * 2 + 1), |
| _stack_trim_lower_threshold(GCDrainStackTargetSize), |
| _trim_ticks(), |
| _surviving_young_words_base(nullptr), |
| _surviving_young_words(nullptr), |
| _surviving_words_length(collection_set->young_region_length() + 1), |
| _old_gen_is_full(false), |
| _partial_objarray_chunk_size(ParGCArrayScanChunk), |
| _partial_array_stepper(num_workers), |
| _string_dedup_requests(), |
| _max_num_optional_regions(collection_set->optional_region_length()), |
| _numa(g1h->numa()), |
| _obj_alloc_stat(nullptr), |
| EVAC_FAILURE_INJECTOR_ONLY(_evac_failure_inject_counter(0) COMMA) |
| _preserved_marks(preserved_marks), |
| _evacuation_failed_info(), |
| _evac_failure_regions(evac_failure_regions) |
| { |
| // We allocate number of young gen regions in the collection set plus one |
| // entries, since entry 0 keeps track of surviving bytes for non-young regions. |
| // We also add a few elements at the beginning and at the end in |
| // an attempt to eliminate cache contention |
| const size_t padding_elem_num = (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)); |
| size_t array_length = padding_elem_num + _surviving_words_length + padding_elem_num; |
| |
| _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length, mtGC); |
| _surviving_young_words = _surviving_young_words_base + padding_elem_num; |
| memset(_surviving_young_words, 0, _surviving_words_length * sizeof(size_t)); |
| |
| _plab_allocator = new G1PLABAllocator(_g1h->allocator()); |
| |
| _closures = G1EvacuationRootClosures::create_root_closures(_g1h, |
| this, |
| collection_set->only_contains_young_regions()); |
| |
| _oops_into_optional_regions = new G1OopStarChunkedList[_max_num_optional_regions]; |
| |
| initialize_numa_stats(); |
| } |
| |
| size_t G1ParScanThreadState::flush_stats(size_t* surviving_young_words, uint num_workers) { |
| _rdc_local_qset.flush(); |
| flush_numa_stats(); |
| // Update allocation statistics. |
| _plab_allocator->flush_and_retire_stats(num_workers); |
| _g1h->policy()->record_age_table(&_age_table); |
| |
| if (_evacuation_failed_info.has_failed()) { |
| _g1h->gc_tracer_stw()->report_evacuation_failed(_evacuation_failed_info); |
| } |
| |
| size_t sum = 0; |
| for (uint i = 0; i < _surviving_words_length; i++) { |
| surviving_young_words[i] += _surviving_young_words[i]; |
| sum += _surviving_young_words[i]; |
| } |
| return sum; |
| } |
| |
| G1ParScanThreadState::~G1ParScanThreadState() { |
| delete _plab_allocator; |
| delete _closures; |
| FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
| delete[] _oops_into_optional_regions; |
| FREE_C_HEAP_ARRAY(size_t, _obj_alloc_stat); |
| } |
| |
| size_t G1ParScanThreadState::lab_waste_words() const { |
| return _plab_allocator->waste(); |
| } |
| |
| size_t G1ParScanThreadState::lab_undo_waste_words() const { |
| return _plab_allocator->undo_waste(); |
| } |
| |
| #ifdef ASSERT |
| void G1ParScanThreadState::verify_task(narrowOop* task) const { |
| assert(task != nullptr, "invariant"); |
| assert(UseCompressedOops, "sanity"); |
| oop p = RawAccess<>::oop_load(task); |
| assert(_g1h->is_in_reserved(p), |
| "task=" PTR_FORMAT " p=" PTR_FORMAT, p2i(task), p2i(p)); |
| } |
| |
| void G1ParScanThreadState::verify_task(oop* task) const { |
| assert(task != nullptr, "invariant"); |
| oop p = RawAccess<>::oop_load(task); |
| assert(_g1h->is_in_reserved(p), |
| "task=" PTR_FORMAT " p=" PTR_FORMAT, p2i(task), p2i(p)); |
| } |
| |
| void G1ParScanThreadState::verify_task(PartialArrayScanTask task) const { |
| // Must be in the collection set--it's already been copied. |
| oop p = task.to_source_array(); |
| assert(_g1h->is_in_cset(p), "p=" PTR_FORMAT, p2i(p)); |
| } |
| |
| void G1ParScanThreadState::verify_task(ScannerTask task) const { |
| if (task.is_narrow_oop_ptr()) { |
| verify_task(task.to_narrow_oop_ptr()); |
| } else if (task.is_oop_ptr()) { |
| verify_task(task.to_oop_ptr()); |
| } else if (task.is_partial_array_task()) { |
| verify_task(task.to_partial_array_task()); |
| } else { |
| ShouldNotReachHere(); |
| } |
| } |
| #endif // ASSERT |
| |
| template <class T> |
| MAYBE_INLINE_EVACUATION |
| void G1ParScanThreadState::do_oop_evac(T* p) { |
| // Reference should not be null here as such are never pushed to the task queue. |
| oop obj = RawAccess<IS_NOT_NULL>::oop_load(p); |
| |
| // Although we never intentionally push references outside of the collection |
| // set, due to (benign) races in the claim mechanism during RSet scanning more |
| // than one thread might claim the same card. So the same card may be |
| // processed multiple times, and so we might get references into old gen here. |
| // So we need to redo this check. |
| const G1HeapRegionAttr region_attr = _g1h->region_attr(obj); |
| // References pushed onto the work stack should never point to a humongous region |
| // as they are not added to the collection set due to above precondition. |
| assert(!region_attr.is_humongous_candidate(), |
| "Obj " PTR_FORMAT " should not refer to humongous region %u from " PTR_FORMAT, |
| p2i(obj), _g1h->addr_to_region(obj), p2i(p)); |
| |
| if (!region_attr.is_in_cset()) { |
| // In this case somebody else already did all the work. |
| return; |
| } |
| |
| markWord m = obj->mark(); |
| if (m.is_marked()) { |
| obj = cast_to_oop(m.decode_pointer()); |
| } else { |
| obj = do_copy_to_survivor_space(region_attr, obj, m); |
| } |
| RawAccess<IS_NOT_NULL>::oop_store(p, obj); |
| |
| write_ref_field_post(p, obj); |
| } |
| |
| MAYBE_INLINE_EVACUATION |
| void G1ParScanThreadState::do_partial_array(PartialArrayScanTask task) { |
| oop from_obj = task.to_source_array(); |
| |
| assert(_g1h->is_in_reserved(from_obj), "must be in heap."); |
| assert(from_obj->is_objArray(), "must be obj array"); |
| assert(from_obj->is_forwarded(), "must be forwarded"); |
| |
| oop to_obj = from_obj->forwardee(); |
| assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
| assert(to_obj->is_objArray(), "must be obj array"); |
| objArrayOop to_array = objArrayOop(to_obj); |
| |
| PartialArrayTaskStepper::Step step |
| = _partial_array_stepper.next(objArrayOop(from_obj), |
| to_array, |
| _partial_objarray_chunk_size); |
| for (uint i = 0; i < step._ncreate; ++i) { |
| push_on_queue(ScannerTask(PartialArrayScanTask(from_obj))); |
| } |
| |
| G1HeapRegionAttr dest_attr = _g1h->region_attr(to_array); |
| G1SkipCardEnqueueSetter x(&_scanner, dest_attr.is_new_survivor()); |
| // Process claimed task. The length of to_array is not correct, but |
| // fortunately the iteration ignores the length field and just relies |
| // on start/end. |
| to_array->oop_iterate_range(&_scanner, |
| step._index, |
| step._index + _partial_objarray_chunk_size); |
| } |
| |
| MAYBE_INLINE_EVACUATION |
| void G1ParScanThreadState::start_partial_objarray(G1HeapRegionAttr dest_attr, |
| oop from_obj, |
| oop to_obj) { |
| assert(from_obj->is_objArray(), "precondition"); |
| assert(from_obj->is_forwarded(), "precondition"); |
| assert(from_obj->forwardee() == to_obj, "precondition"); |
| assert(from_obj != to_obj, "should not be scanning self-forwarded objects"); |
| assert(to_obj->is_objArray(), "precondition"); |
| |
| objArrayOop to_array = objArrayOop(to_obj); |
| |
| PartialArrayTaskStepper::Step step |
| = _partial_array_stepper.start(objArrayOop(from_obj), |
| to_array, |
| _partial_objarray_chunk_size); |
| |
| // Push any needed partial scan tasks. Pushed before processing the |
| // initial chunk to allow other workers to steal while we're processing. |
| for (uint i = 0; i < step._ncreate; ++i) { |
| push_on_queue(ScannerTask(PartialArrayScanTask(from_obj))); |
| } |
| |
| // Skip the card enqueue iff the object (to_array) is in survivor region. |
| // However, HeapRegion::is_survivor() is too expensive here. |
| // Instead, we use dest_attr.is_young() because the two values are always |
| // equal: successfully allocated young regions must be survivor regions. |
| assert(dest_attr.is_young() == _g1h->heap_region_containing(to_array)->is_survivor(), "must be"); |
| G1SkipCardEnqueueSetter x(&_scanner, dest_attr.is_young()); |
| // Process the initial chunk. No need to process the type in the |
| // klass, as it will already be handled by processing the built-in |
| // module. The length of to_array is not correct, but fortunately |
| // the iteration ignores that length field and relies on start/end. |
| to_array->oop_iterate_range(&_scanner, 0, step._index); |
| } |
| |
| MAYBE_INLINE_EVACUATION |
| void G1ParScanThreadState::dispatch_task(ScannerTask task) { |
| verify_task(task); |
| if (task.is_narrow_oop_ptr()) { |
| do_oop_evac(task.to_narrow_oop_ptr()); |
| } else if (task.is_oop_ptr()) { |
| do_oop_evac(task.to_oop_ptr()); |
| } else { |
| do_partial_array(task.to_partial_array_task()); |
| } |
| } |
| |
| // Process tasks until overflow queue is empty and local queue |
| // contains no more than threshold entries. NOINLINE to prevent |
| // inlining into steal_and_trim_queue. |
| ATTRIBUTE_FLATTEN NOINLINE |
| void G1ParScanThreadState::trim_queue_to_threshold(uint threshold) { |
| ScannerTask task; |
| do { |
| while (_task_queue->pop_overflow(task)) { |
| if (!_task_queue->try_push_to_taskqueue(task)) { |
| dispatch_task(task); |
| } |
| } |
| while (_task_queue->pop_local(task, threshold)) { |
| dispatch_task(task); |
| } |
| } while (!_task_queue->overflow_empty()); |
| } |
| |
| ATTRIBUTE_FLATTEN |
| void G1ParScanThreadState::steal_and_trim_queue(G1ScannerTasksQueueSet* task_queues) { |
| ScannerTask stolen_task; |
| while (task_queues->steal(_worker_id, stolen_task)) { |
| dispatch_task(stolen_task); |
| // Processing stolen task may have added tasks to our queue. |
| trim_queue(); |
| } |
| } |
| |
| HeapWord* G1ParScanThreadState::allocate_in_next_plab(G1HeapRegionAttr* dest, |
| size_t word_sz, |
| bool previous_plab_refill_failed, |
| uint node_index) { |
| |
| assert(dest->is_in_cset_or_humongous_candidate(), "Unexpected dest: %s region attr", dest->get_type_str()); |
| |
| // Right now we only have two types of regions (young / old) so |
| // let's keep the logic here simple. We can generalize it when necessary. |
| if (dest->is_young()) { |
| bool plab_refill_in_old_failed = false; |
| HeapWord* const obj_ptr = _plab_allocator->allocate(G1HeapRegionAttr::Old, |
| word_sz, |
| &plab_refill_in_old_failed, |
| node_index); |
| // Make sure that we won't attempt to copy any other objects out |
| // of a survivor region (given that apparently we cannot allocate |
| // any new ones) to avoid coming into this slow path again and again. |
| // Only consider failed PLAB refill here: failed inline allocations are |
| // typically large, so not indicative of remaining space. |
| if (previous_plab_refill_failed) { |
| _tenuring_threshold = 0; |
| } |
| |
| if (obj_ptr != nullptr) { |
| dest->set_old(); |
| } else { |
| // We just failed to allocate in old gen. The same idea as explained above |
| // for making survivor gen unavailable for allocation applies for old gen. |
| _old_gen_is_full = plab_refill_in_old_failed; |
| } |
| return obj_ptr; |
| } else { |
| _old_gen_is_full = previous_plab_refill_failed; |
| assert(dest->is_old(), "Unexpected dest region attr: %s", dest->get_type_str()); |
| // no other space to try. |
| return nullptr; |
| } |
| } |
| |
| G1HeapRegionAttr G1ParScanThreadState::next_region_attr(G1HeapRegionAttr const region_attr, markWord const m, uint& age) { |
| assert(region_attr.is_young() || region_attr.is_old(), "must be either Young or Old"); |
| |
| if (region_attr.is_young()) { |
| age = !m.has_displaced_mark_helper() ? m.age() |
| : m.displaced_mark_helper().age(); |
| if (age < _tenuring_threshold) { |
| return region_attr; |
| } |
| } |
| // young-to-old (promotion) or old-to-old; destination is old in both cases. |
| return G1HeapRegionAttr::Old; |
| } |
| |
| void G1ParScanThreadState::report_promotion_event(G1HeapRegionAttr const dest_attr, |
| oop const old, size_t word_sz, uint age, |
| HeapWord * const obj_ptr, uint node_index) const { |
| PLAB* alloc_buf = _plab_allocator->alloc_buffer(dest_attr, node_index); |
| if (alloc_buf->contains(obj_ptr)) { |
| _g1h->gc_tracer_stw()->report_promotion_in_new_plab_event(old->klass(), word_sz * HeapWordSize, age, |
| dest_attr.type() == G1HeapRegionAttr::Old, |
| alloc_buf->word_sz() * HeapWordSize); |
| } else { |
| _g1h->gc_tracer_stw()->report_promotion_outside_plab_event(old->klass(), word_sz * HeapWordSize, age, |
| dest_attr.type() == G1HeapRegionAttr::Old); |
| } |
| } |
| |
| NOINLINE |
| HeapWord* G1ParScanThreadState::allocate_copy_slow(G1HeapRegionAttr* dest_attr, |
| oop old, |
| size_t word_sz, |
| uint age, |
| uint node_index) { |
| HeapWord* obj_ptr = nullptr; |
| // Try slow-path allocation unless we're allocating old and old is already full. |
| if (!(dest_attr->is_old() && _old_gen_is_full)) { |
| bool plab_refill_failed = false; |
| obj_ptr = _plab_allocator->allocate_direct_or_new_plab(*dest_attr, |
| word_sz, |
| &plab_refill_failed, |
| node_index); |
| if (obj_ptr == nullptr) { |
| obj_ptr = allocate_in_next_plab(dest_attr, |
| word_sz, |
| plab_refill_failed, |
| node_index); |
| } |
| } |
| if (obj_ptr != nullptr) { |
| update_numa_stats(node_index); |
| if (_g1h->gc_tracer_stw()->should_report_promotion_events()) { |
| // The events are checked individually as part of the actual commit |
| report_promotion_event(*dest_attr, old, word_sz, age, obj_ptr, node_index); |
| } |
| } |
| return obj_ptr; |
| } |
| |
| #if EVAC_FAILURE_INJECTOR |
| bool G1ParScanThreadState::inject_evacuation_failure(uint region_idx) { |
| return _g1h->evac_failure_injector()->evacuation_should_fail(_evac_failure_inject_counter, region_idx); |
| } |
| #endif |
| |
| NOINLINE |
| void G1ParScanThreadState::undo_allocation(G1HeapRegionAttr dest_attr, |
| HeapWord* obj_ptr, |
| size_t word_sz, |
| uint node_index) { |
| _plab_allocator->undo_allocation(dest_attr, obj_ptr, word_sz, node_index); |
| } |
| |
| void G1ParScanThreadState::update_bot_after_copying(oop obj, size_t word_sz) { |
| HeapWord* obj_start = cast_from_oop<HeapWord*>(obj); |
| HeapRegion* region = _g1h->heap_region_containing(obj_start); |
| region->update_bot_for_obj(obj_start, word_sz); |
| } |
| |
| // Private inline function, for direct internal use and providing the |
| // implementation of the public not-inline function. |
| MAYBE_INLINE_EVACUATION |
| oop G1ParScanThreadState::do_copy_to_survivor_space(G1HeapRegionAttr const region_attr, |
| oop const old, |
| markWord const old_mark) { |
| assert(region_attr.is_in_cset(), |
| "Unexpected region attr type: %s", region_attr.get_type_str()); |
| |
| // Get the klass once. We'll need it again later, and this avoids |
| // re-decoding when it's compressed. |
| Klass* klass = old->klass(); |
| const size_t word_sz = old->size_given_klass(klass); |
| |
| uint age = 0; |
| G1HeapRegionAttr dest_attr = next_region_attr(region_attr, old_mark, age); |
| HeapRegion* const from_region = _g1h->heap_region_containing(old); |
| uint node_index = from_region->node_index(); |
| |
| HeapWord* obj_ptr = _plab_allocator->plab_allocate(dest_attr, word_sz, node_index); |
| |
| // PLAB allocations should succeed most of the time, so we'll |
| // normally check against null once and that's it. |
| if (obj_ptr == nullptr) { |
| obj_ptr = allocate_copy_slow(&dest_attr, old, word_sz, age, node_index); |
| if (obj_ptr == nullptr) { |
| // This will either forward-to-self, or detect that someone else has |
| // installed a forwarding pointer. |
| return handle_evacuation_failure_par(old, old_mark, word_sz); |
| } |
| } |
| |
| assert(obj_ptr != nullptr, "when we get here, allocation should have succeeded"); |
| assert(_g1h->is_in_reserved(obj_ptr), "Allocated memory should be in the heap"); |
| |
| // Should this evacuation fail? |
| if (inject_evacuation_failure(from_region->hrm_index())) { |
| // Doing this after all the allocation attempts also tests the |
| // undo_allocation() method too. |
| undo_allocation(dest_attr, obj_ptr, word_sz, node_index); |
| return handle_evacuation_failure_par(old, old_mark, word_sz); |
| } |
| |
| // We're going to allocate linearly, so might as well prefetch ahead. |
| Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); |
| Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(old), obj_ptr, word_sz); |
| |
| const oop obj = cast_to_oop(obj_ptr); |
| // Because the forwarding is done with memory_order_relaxed there is no |
| // ordering with the above copy. Clients that get the forwardee must not |
| // examine its contents without other synchronization, since the contents |
| // may not be up to date for them. |
| const oop forward_ptr = old->forward_to_atomic(obj, old_mark, memory_order_relaxed); |
| if (forward_ptr == nullptr) { |
| |
| { |
| const uint young_index = from_region->young_index_in_cset(); |
| assert((from_region->is_young() && young_index > 0) || |
| (!from_region->is_young() && young_index == 0), "invariant" ); |
| _surviving_young_words[young_index] += word_sz; |
| } |
| |
| if (dest_attr.is_young()) { |
| if (age < markWord::max_age) { |
| age++; |
| obj->incr_age(); |
| } |
| _age_table.add(age, word_sz); |
| } else { |
| update_bot_after_copying(obj, word_sz); |
| } |
| |
| // Most objects are not arrays, so do one array check rather than |
| // checking for each array category for each object. |
| if (klass->is_array_klass()) { |
| if (klass->is_objArray_klass()) { |
| start_partial_objarray(dest_attr, old, obj); |
| } else { |
| // Nothing needs to be done for typeArrays. Body doesn't contain |
| // any oops to scan, and the type in the klass will already be handled |
| // by processing the built-in module. |
| assert(klass->is_typeArray_klass(), "invariant"); |
| } |
| return obj; |
| } |
| |
| ContinuationGCSupport::transform_stack_chunk(obj); |
| |
| // Check for deduplicating young Strings. |
| if (G1StringDedup::is_candidate_from_evacuation(klass, |
| region_attr, |
| dest_attr, |
| age)) { |
| // Record old; request adds a new weak reference, which reference |
| // processing expects to refer to a from-space object. |
| _string_dedup_requests.add(old); |
| } |
| |
| // Skip the card enqueue iff the object (obj) is in survivor region. |
| // However, HeapRegion::is_survivor() is too expensive here. |
| // Instead, we use dest_attr.is_young() because the two values are always |
| // equal: successfully allocated young regions must be survivor regions. |
| assert(dest_attr.is_young() == _g1h->heap_region_containing(obj)->is_survivor(), "must be"); |
| G1SkipCardEnqueueSetter x(&_scanner, dest_attr.is_young()); |
| obj->oop_iterate_backwards(&_scanner, klass); |
| return obj; |
| } else { |
| _plab_allocator->undo_allocation(dest_attr, obj_ptr, word_sz, node_index); |
| return forward_ptr; |
| } |
| } |
| |
| // Public not-inline entry point. |
| ATTRIBUTE_FLATTEN |
| oop G1ParScanThreadState::copy_to_survivor_space(G1HeapRegionAttr region_attr, |
| oop old, |
| markWord old_mark) { |
| return do_copy_to_survivor_space(region_attr, old, old_mark); |
| } |
| |
| G1ParScanThreadState* G1ParScanThreadStateSet::state_for_worker(uint worker_id) { |
| assert(worker_id < _num_workers, "out of bounds access"); |
| if (_states[worker_id] == nullptr) { |
| _states[worker_id] = |
| new G1ParScanThreadState(_g1h, rdcqs(), |
| _preserved_marks_set.get(worker_id), |
| worker_id, |
| _num_workers, |
| _collection_set, |
| _evac_failure_regions); |
| } |
| return _states[worker_id]; |
| } |
| |
| const size_t* G1ParScanThreadStateSet::surviving_young_words() const { |
| assert(_flushed, "thread local state from the per thread states should have been flushed"); |
| return _surviving_young_words_total; |
| } |
| |
| void G1ParScanThreadStateSet::flush_stats() { |
| assert(!_flushed, "thread local state from the per thread states should be flushed once"); |
| |
| for (uint worker_id = 0; worker_id < _num_workers; ++worker_id) { |
| G1ParScanThreadState* pss = _states[worker_id]; |
| assert(pss != nullptr, "must be initialized"); |
| |
| G1GCPhaseTimes* p = _g1h->phase_times(); |
| |
| // Need to get the following two before the call to G1ParThreadScanState::flush() |
| // because it resets the PLAB allocator where we get this info from. |
| size_t lab_waste_bytes = pss->lab_waste_words() * HeapWordSize; |
| size_t lab_undo_waste_bytes = pss->lab_undo_waste_words() * HeapWordSize; |
| size_t copied_bytes = pss->flush_stats(_surviving_young_words_total, _num_workers) * HeapWordSize; |
| |
| p->record_or_add_thread_work_item(G1GCPhaseTimes::MergePSS, worker_id, copied_bytes, G1GCPhaseTimes::MergePSSCopiedBytes); |
| p->record_or_add_thread_work_item(G1GCPhaseTimes::MergePSS, worker_id, lab_waste_bytes, G1GCPhaseTimes::MergePSSLABWasteBytes); |
| p->record_or_add_thread_work_item(G1GCPhaseTimes::MergePSS, worker_id, lab_undo_waste_bytes, G1GCPhaseTimes::MergePSSLABUndoWasteBytes); |
| |
| delete pss; |
| _states[worker_id] = nullptr; |
| } |
| _flushed = true; |
| } |
| |
| void G1ParScanThreadStateSet::record_unused_optional_region(HeapRegion* hr) { |
| for (uint worker_index = 0; worker_index < _num_workers; ++worker_index) { |
| G1ParScanThreadState* pss = _states[worker_index]; |
| assert(pss != nullptr, "must be initialized"); |
| |
| size_t used_memory = pss->oops_into_optional_region(hr)->used_memory(); |
| _g1h->phase_times()->record_or_add_thread_work_item(G1GCPhaseTimes::OptScanHR, worker_index, used_memory, G1GCPhaseTimes::ScanHRUsedMemory); |
| } |
| } |
| |
| NOINLINE |
| oop G1ParScanThreadState::handle_evacuation_failure_par(oop old, markWord m, size_t word_sz) { |
| assert(_g1h->is_in_cset(old), "Object " PTR_FORMAT " should be in the CSet", p2i(old)); |
| |
| oop forward_ptr = old->forward_to_atomic(old, m, memory_order_relaxed); |
| if (forward_ptr == nullptr) { |
| // Forward-to-self succeeded. We are the "owner" of the object. |
| HeapRegion* r = _g1h->heap_region_containing(old); |
| |
| if (_evac_failure_regions->record(r->hrm_index())) { |
| _g1h->hr_printer()->evac_failure(r); |
| } |
| |
| // Mark the failing object in the marking bitmap and later use the bitmap to handle |
| // evacuation failure recovery. |
| _g1h->mark_evac_failure_object(_worker_id, old, word_sz); |
| |
| _preserved_marks->push_if_necessary(old, m); |
| |
| ContinuationGCSupport::transform_stack_chunk(old); |
| |
| _evacuation_failed_info.register_copy_failure(word_sz); |
| |
| // For iterating objects that failed evacuation currently we can reuse the |
| // existing closure to scan evacuated objects because: |
| // - for objects referring into the collection set we do not need to gather |
| // cards at this time. The regions they are in will be unconditionally turned |
| // to old regions without remembered sets. |
| // - since we are iterating from a collection set region (i.e. never a Survivor |
| // region), we always need to gather cards for this case. |
| G1SkipCardEnqueueSetter x(&_scanner, false /* skip_card_enqueue */); |
| old->oop_iterate_backwards(&_scanner); |
| |
| return old; |
| } else { |
| // Forward-to-self failed. Either someone else managed to allocate |
| // space for this object (old != forward_ptr) or they beat us in |
| // self-forwarding it (old == forward_ptr). |
| assert(old == forward_ptr || !_g1h->is_in_cset(forward_ptr), |
| "Object " PTR_FORMAT " forwarded to: " PTR_FORMAT " " |
| "should not be in the CSet", |
| p2i(old), p2i(forward_ptr)); |
| return forward_ptr; |
| } |
| } |
| |
| void G1ParScanThreadState::initialize_numa_stats() { |
| if (_numa->is_enabled()) { |
| LogTarget(Info, gc, heap, numa) lt; |
| |
| if (lt.is_enabled()) { |
| uint num_nodes = _numa->num_active_nodes(); |
| // Record only if there are multiple active nodes. |
| _obj_alloc_stat = NEW_C_HEAP_ARRAY(size_t, num_nodes, mtGC); |
| memset(_obj_alloc_stat, 0, sizeof(size_t) * num_nodes); |
| } |
| } |
| } |
| |
| void G1ParScanThreadState::flush_numa_stats() { |
| if (_obj_alloc_stat != nullptr) { |
| uint node_index = _numa->index_of_current_thread(); |
| _numa->copy_statistics(G1NUMAStats::LocalObjProcessAtCopyToSurv, node_index, _obj_alloc_stat); |
| } |
| } |
| |
| void G1ParScanThreadState::update_numa_stats(uint node_index) { |
| if (_obj_alloc_stat != nullptr) { |
| _obj_alloc_stat[node_index]++; |
| } |
| } |
| |
| G1ParScanThreadStateSet::G1ParScanThreadStateSet(G1CollectedHeap* g1h, |
| uint num_workers, |
| G1CollectionSet* collection_set, |
| G1EvacFailureRegions* evac_failure_regions) : |
| _g1h(g1h), |
| _collection_set(collection_set), |
| _rdcqs(G1BarrierSet::dirty_card_queue_set().allocator()), |
| _preserved_marks_set(true /* in_c_heap */), |
| _states(NEW_C_HEAP_ARRAY(G1ParScanThreadState*, num_workers, mtGC)), |
| _surviving_young_words_total(NEW_C_HEAP_ARRAY(size_t, collection_set->young_region_length() + 1, mtGC)), |
| _num_workers(num_workers), |
| _flushed(false), |
| _evac_failure_regions(evac_failure_regions) { |
| _preserved_marks_set.init(num_workers); |
| for (uint i = 0; i < num_workers; ++i) { |
| _states[i] = nullptr; |
| } |
| memset(_surviving_young_words_total, 0, (collection_set->young_region_length() + 1) * sizeof(size_t)); |
| } |
| |
| G1ParScanThreadStateSet::~G1ParScanThreadStateSet() { |
| assert(_flushed, "thread local state from the per thread states should have been flushed"); |
| FREE_C_HEAP_ARRAY(G1ParScanThreadState*, _states); |
| FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_total); |
| _preserved_marks_set.assert_empty(); |
| _preserved_marks_set.reclaim(); |
| } |
