author | stefank |
Thu, 21 May 2015 09:23:46 +0200 | |
changeset 30869 | d5cbedffb50b |
parent 30868 | c1b24f26deed |
child 30871 | e90a8de769e4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "gc/cms/compactibleFreeListSpace.hpp" |
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#include "gc/cms/concurrentMarkSweepGeneration.hpp" |
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#include "gc/cms/parNewGeneration.hpp" |
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#include "gc/cms/parOopClosures.inline.hpp" |
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#include "gc/serial/defNewGeneration.inline.hpp" |
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#include "gc/shared/adaptiveSizePolicy.hpp" |
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#include "gc/shared/ageTable.hpp" |
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#include "gc/shared/copyFailedInfo.hpp" |
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#include "gc/shared/gcHeapSummary.hpp" |
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#include "gc/shared/gcTimer.hpp" |
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#include "gc/shared/gcTrace.hpp" |
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#include "gc/shared/gcTraceTime.hpp" |
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#include "gc/shared/genCollectedHeap.hpp" |
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#include "gc/shared/genOopClosures.inline.hpp" |
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#include "gc/shared/generation.hpp" |
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#include "gc/shared/plab.inline.hpp" |
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#include "gc/shared/referencePolicy.hpp" |
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#include "gc/shared/space.hpp" |
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#include "gc/shared/spaceDecorator.hpp" |
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#include "gc/shared/strongRootsScope.hpp" |
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#include "gc/shared/taskqueue.inline.hpp" |
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#include "gc/shared/workgroup.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/objArrayOop.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/atomic.inline.hpp" |
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#include "runtime/handles.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "utilities/copy.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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#include "utilities/stack.inline.hpp" |
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#ifdef _MSC_VER |
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#pragma warning( push ) |
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#pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
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#endif |
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ParScanThreadState::ParScanThreadState(Space* to_space_, |
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ParNewGeneration* gen_, |
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Generation* old_gen_, |
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int thread_num_, |
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ObjToScanQueueSet* work_queue_set_, |
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Stack<oop, mtGC>* overflow_stacks_, |
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size_t desired_plab_sz_, |
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ParallelTaskTerminator& term_) : |
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_to_space(to_space_), _old_gen(old_gen_), _young_gen(gen_), _thread_num(thread_num_), |
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_work_queue(work_queue_set_->queue(thread_num_)), _to_space_full(false), |
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_overflow_stack(overflow_stacks_ ? overflow_stacks_ + thread_num_ : NULL), |
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_ageTable(false), // false ==> not the global age table, no perf data. |
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_to_space_alloc_buffer(desired_plab_sz_), |
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_to_space_closure(gen_, this), _old_gen_closure(gen_, this), |
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_to_space_root_closure(gen_, this), _old_gen_root_closure(gen_, this), |
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_older_gen_closure(gen_, this), |
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_evacuate_followers(this, &_to_space_closure, &_old_gen_closure, |
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&_to_space_root_closure, gen_, &_old_gen_root_closure, |
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work_queue_set_, &term_), |
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_is_alive_closure(gen_), _scan_weak_ref_closure(gen_, this), |
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_keep_alive_closure(&_scan_weak_ref_closure), |
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_strong_roots_time(0.0), _term_time(0.0) |
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{ |
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#if TASKQUEUE_STATS |
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_term_attempts = 0; |
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_overflow_refills = 0; |
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_overflow_refill_objs = 0; |
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#endif // TASKQUEUE_STATS |
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_survivor_chunk_array = |
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(ChunkArray*) old_gen()->get_data_recorder(thread_num()); |
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_hash_seed = 17; // Might want to take time-based random value. |
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_start = os::elapsedTime(); |
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_old_gen_closure.set_generation(old_gen_); |
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_old_gen_root_closure.set_generation(old_gen_); |
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} |
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#ifdef _MSC_VER |
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#pragma warning( pop ) |
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#endif |
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void ParScanThreadState::record_survivor_plab(HeapWord* plab_start, |
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size_t plab_word_size) { |
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ChunkArray* sca = survivor_chunk_array(); |
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if (sca != NULL) { |
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// A non-null SCA implies that we want the PLAB data recorded. |
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sca->record_sample(plab_start, plab_word_size); |
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} |
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} |
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bool ParScanThreadState::should_be_partially_scanned(oop new_obj, oop old_obj) const { |
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return new_obj->is_objArray() && |
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arrayOop(new_obj)->length() > ParGCArrayScanChunk && |
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new_obj != old_obj; |
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} |
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void ParScanThreadState::scan_partial_array_and_push_remainder(oop old) { |
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assert(old->is_objArray(), "must be obj array"); |
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assert(old->is_forwarded(), "must be forwarded"); |
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assert(GenCollectedHeap::heap()->is_in_reserved(old), "must be in heap."); |
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assert(!old_gen()->is_in(old), "must be in young generation."); |
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objArrayOop obj = objArrayOop(old->forwardee()); |
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// Process ParGCArrayScanChunk elements now |
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// and push the remainder back onto queue |
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int start = arrayOop(old)->length(); |
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int end = obj->length(); |
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int remainder = end - start; |
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assert(start <= end, "just checking"); |
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if (remainder > 2 * ParGCArrayScanChunk) { |
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// Test above combines last partial chunk with a full chunk |
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end = start + ParGCArrayScanChunk; |
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arrayOop(old)->set_length(end); |
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// Push remainder. |
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bool ok = work_queue()->push(old); |
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assert(ok, "just popped, push must be okay"); |
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} else { |
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// Restore length so that it can be used if there |
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// is a promotion failure and forwarding pointers |
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// must be removed. |
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arrayOop(old)->set_length(end); |
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} |
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// process our set of indices (include header in first chunk) |
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// should make sure end is even (aligned to HeapWord in case of compressed oops) |
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if ((HeapWord *)obj < young_old_boundary()) { |
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// object is in to_space |
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obj->oop_iterate_range(&_to_space_closure, start, end); |
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} else { |
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// object is in old generation |
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obj->oop_iterate_range(&_old_gen_closure, start, end); |
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} |
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} |
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void ParScanThreadState::trim_queues(int max_size) { |
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ObjToScanQueue* queue = work_queue(); |
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do { |
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while (queue->size() > (juint)max_size) { |
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oop obj_to_scan; |
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if (queue->pop_local(obj_to_scan)) { |
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if ((HeapWord *)obj_to_scan < young_old_boundary()) { |
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if (obj_to_scan->is_objArray() && |
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obj_to_scan->is_forwarded() && |
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obj_to_scan->forwardee() != obj_to_scan) { |
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scan_partial_array_and_push_remainder(obj_to_scan); |
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} else { |
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// object is in to_space |
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obj_to_scan->oop_iterate(&_to_space_closure); |
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} |
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} else { |
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// object is in old generation |
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obj_to_scan->oop_iterate(&_old_gen_closure); |
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} |
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} |
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} |
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// For the case of compressed oops, we have a private, non-shared |
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// overflow stack, so we eagerly drain it so as to more evenly |
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// distribute load early. Note: this may be good to do in |
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// general rather than delay for the final stealing phase. |
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// If applicable, we'll transfer a set of objects over to our |
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// work queue, allowing them to be stolen and draining our |
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// private overflow stack. |
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} while (ParGCTrimOverflow && young_gen()->take_from_overflow_list(this)); |
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} |
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|
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bool ParScanThreadState::take_from_overflow_stack() { |
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assert(ParGCUseLocalOverflow, "Else should not call"); |
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assert(young_gen()->overflow_list() == NULL, "Error"); |
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ObjToScanQueue* queue = work_queue(); |
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Stack<oop, mtGC>* const of_stack = overflow_stack(); |
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const size_t num_overflow_elems = of_stack->size(); |
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const size_t space_available = queue->max_elems() - queue->size(); |
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const size_t num_take_elems = MIN3(space_available / 4, |
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ParGCDesiredObjsFromOverflowList, |
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num_overflow_elems); |
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// Transfer the most recent num_take_elems from the overflow |
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// stack to our work queue. |
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for (size_t i = 0; i != num_take_elems; i++) { |
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oop cur = of_stack->pop(); |
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oop obj_to_push = cur->forwardee(); |
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assert(GenCollectedHeap::heap()->is_in_reserved(cur), "Should be in heap"); |
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assert(!old_gen()->is_in_reserved(cur), "Should be in young gen"); |
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assert(GenCollectedHeap::heap()->is_in_reserved(obj_to_push), "Should be in heap"); |
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if (should_be_partially_scanned(obj_to_push, cur)) { |
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assert(arrayOop(cur)->length() == 0, "entire array remaining to be scanned"); |
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obj_to_push = cur; |
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} |
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bool ok = queue->push(obj_to_push); |
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assert(ok, "Should have succeeded"); |
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} |
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assert(young_gen()->overflow_list() == NULL, "Error"); |
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return num_take_elems > 0; // was something transferred? |
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} |
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|
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void ParScanThreadState::push_on_overflow_stack(oop p) { |
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assert(ParGCUseLocalOverflow, "Else should not call"); |
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overflow_stack()->push(p); |
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assert(young_gen()->overflow_list() == NULL, "Error"); |
1 | 222 |
} |
223 |
||
224 |
HeapWord* ParScanThreadState::alloc_in_to_space_slow(size_t word_sz) { |
|
225 |
||
226 |
// Otherwise, if the object is small enough, try to reallocate the |
|
227 |
// buffer. |
|
228 |
HeapWord* obj = NULL; |
|
229 |
if (!_to_space_full) { |
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PLAB* const plab = to_space_alloc_buffer(); |
1 | 231 |
Space* const sp = to_space(); |
232 |
if (word_sz * 100 < |
|
233 |
ParallelGCBufferWastePct * plab->word_sz()) { |
|
234 |
// Is small enough; abandon this buffer and start a new one. |
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plab->retire(); |
1 | 236 |
size_t buf_size = plab->word_sz(); |
237 |
HeapWord* buf_space = sp->par_allocate(buf_size); |
|
238 |
if (buf_space == NULL) { |
|
239 |
const size_t min_bytes = |
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PLAB::min_size() << LogHeapWordSize; |
1 | 241 |
size_t free_bytes = sp->free(); |
242 |
while(buf_space == NULL && free_bytes >= min_bytes) { |
|
243 |
buf_size = free_bytes >> LogHeapWordSize; |
|
244 |
assert(buf_size == (size_t)align_object_size(buf_size), |
|
245 |
"Invariant"); |
|
246 |
buf_space = sp->par_allocate(buf_size); |
|
247 |
free_bytes = sp->free(); |
|
248 |
} |
|
249 |
} |
|
250 |
if (buf_space != NULL) { |
|
251 |
plab->set_word_size(buf_size); |
|
252 |
plab->set_buf(buf_space); |
|
253 |
record_survivor_plab(buf_space, buf_size); |
|
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obj = plab->allocate_aligned(word_sz, SurvivorAlignmentInBytes); |
1 | 255 |
// Note that we cannot compare buf_size < word_sz below |
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// because of AlignmentReserve (see PLAB::allocate()). |
1 | 257 |
assert(obj != NULL || plab->words_remaining() < word_sz, |
258 |
"Else should have been able to allocate"); |
|
259 |
// It's conceivable that we may be able to use the |
|
260 |
// buffer we just grabbed for subsequent small requests |
|
261 |
// even if not for this one. |
|
262 |
} else { |
|
263 |
// We're used up. |
|
264 |
_to_space_full = true; |
|
265 |
} |
|
266 |
||
267 |
} else { |
|
268 |
// Too large; allocate the object individually. |
|
269 |
obj = sp->par_allocate(word_sz); |
|
270 |
} |
|
271 |
} |
|
272 |
return obj; |
|
273 |
} |
|
274 |
||
275 |
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void ParScanThreadState::undo_alloc_in_to_space(HeapWord* obj, size_t word_sz) { |
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277 |
to_space_alloc_buffer()->undo_allocation(obj, word_sz); |
1 | 278 |
} |
279 |
||
18025 | 280 |
void ParScanThreadState::print_promotion_failure_size() { |
281 |
if (_promotion_failed_info.has_failed() && PrintPromotionFailure) { |
|
282 |
gclog_or_tty->print(" (%d: promotion failure size = " SIZE_FORMAT ") ", |
|
283 |
_thread_num, _promotion_failed_info.first_size()); |
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} |
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} |
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286 |
|
1 | 287 |
class ParScanThreadStateSet: private ResourceArray { |
288 |
public: |
|
289 |
// Initializes states for the specified number of threads; |
|
290 |
ParScanThreadStateSet(int num_threads, |
|
291 |
Space& to_space, |
|
292 |
ParNewGeneration& gen, |
|
293 |
Generation& old_gen, |
|
294 |
ObjToScanQueueSet& queue_set, |
|
13195 | 295 |
Stack<oop, mtGC>* overflow_stacks_, |
1 | 296 |
size_t desired_plab_sz, |
297 |
ParallelTaskTerminator& term); |
|
6252 | 298 |
|
299 |
~ParScanThreadStateSet() { TASKQUEUE_STATS_ONLY(reset_stats()); } |
|
300 |
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inline ParScanThreadState& thread_state(int i); |
6252 | 302 |
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303 |
void trace_promotion_failed(const YoungGCTracer* gc_tracer); |
30585 | 304 |
void reset(uint active_workers, bool promotion_failed); |
1 | 305 |
void flush(); |
6252 | 306 |
|
307 |
#if TASKQUEUE_STATS |
|
308 |
static void |
|
309 |
print_termination_stats_hdr(outputStream* const st = gclog_or_tty); |
|
310 |
void print_termination_stats(outputStream* const st = gclog_or_tty); |
|
311 |
static void |
|
312 |
print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); |
|
313 |
void print_taskqueue_stats(outputStream* const st = gclog_or_tty); |
|
314 |
void reset_stats(); |
|
315 |
#endif // TASKQUEUE_STATS |
|
316 |
||
1 | 317 |
private: |
318 |
ParallelTaskTerminator& _term; |
|
319 |
ParNewGeneration& _gen; |
|
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Generation& _old_gen; |
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public: |
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bool is_valid(int id) const { return id < length(); } |
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323 |
ParallelTaskTerminator* terminator() { return &_term; } |
1 | 324 |
}; |
325 |
||
326 |
||
327 |
ParScanThreadStateSet::ParScanThreadStateSet( |
|
328 |
int num_threads, Space& to_space, ParNewGeneration& gen, |
|
329 |
Generation& old_gen, ObjToScanQueueSet& queue_set, |
|
13195 | 330 |
Stack<oop, mtGC>* overflow_stacks, |
1 | 331 |
size_t desired_plab_sz, ParallelTaskTerminator& term) |
332 |
: ResourceArray(sizeof(ParScanThreadState), num_threads), |
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333 |
_gen(gen), _old_gen(old_gen), _term(term) |
1 | 334 |
{ |
335 |
assert(num_threads > 0, "sanity check!"); |
|
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assert(ParGCUseLocalOverflow == (overflow_stacks != NULL), |
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|
337 |
"overflow_stack allocation mismatch"); |
1 | 338 |
// Initialize states. |
339 |
for (int i = 0; i < num_threads; ++i) { |
|
340 |
new ((ParScanThreadState*)_data + i) |
|
341 |
ParScanThreadState(&to_space, &gen, &old_gen, i, &queue_set, |
|
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342 |
overflow_stacks, desired_plab_sz, term); |
1 | 343 |
} |
344 |
} |
|
345 |
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346 |
inline ParScanThreadState& ParScanThreadStateSet::thread_state(int i) |
1 | 347 |
{ |
348 |
assert(i >= 0 && i < length(), "sanity check!"); |
|
349 |
return ((ParScanThreadState*)_data)[i]; |
|
350 |
} |
|
351 |
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352 |
void ParScanThreadStateSet::trace_promotion_failed(const YoungGCTracer* gc_tracer) { |
18025 | 353 |
for (int i = 0; i < length(); ++i) { |
354 |
if (thread_state(i).promotion_failed()) { |
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|
355 |
gc_tracer->report_promotion_failed(thread_state(i).promotion_failed_info()); |
18025 | 356 |
thread_state(i).promotion_failed_info().reset(); |
357 |
} |
|
358 |
} |
|
359 |
} |
|
1 | 360 |
|
30585 | 361 |
void ParScanThreadStateSet::reset(uint active_threads, bool promotion_failed) |
1 | 362 |
{ |
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363 |
_term.reset_for_reuse(active_threads); |
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364 |
if (promotion_failed) { |
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|
365 |
for (int i = 0; i < length(); ++i) { |
18025 | 366 |
thread_state(i).print_promotion_failure_size(); |
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367 |
} |
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|
368 |
} |
1 | 369 |
} |
370 |
||
6252 | 371 |
#if TASKQUEUE_STATS |
372 |
void |
|
373 |
ParScanThreadState::reset_stats() |
|
374 |
{ |
|
375 |
taskqueue_stats().reset(); |
|
376 |
_term_attempts = 0; |
|
377 |
_overflow_refills = 0; |
|
378 |
_overflow_refill_objs = 0; |
|
379 |
} |
|
380 |
||
381 |
void ParScanThreadStateSet::reset_stats() |
|
382 |
{ |
|
383 |
for (int i = 0; i < length(); ++i) { |
|
384 |
thread_state(i).reset_stats(); |
|
385 |
} |
|
386 |
} |
|
387 |
||
388 |
void |
|
389 |
ParScanThreadStateSet::print_termination_stats_hdr(outputStream* const st) |
|
390 |
{ |
|
391 |
st->print_raw_cr("GC Termination Stats"); |
|
392 |
st->print_raw_cr(" elapsed --strong roots-- " |
|
393 |
"-------termination-------"); |
|
394 |
st->print_raw_cr("thr ms ms % " |
|
395 |
" ms % attempts"); |
|
396 |
st->print_raw_cr("--- --------- --------- ------ " |
|
397 |
"--------- ------ --------"); |
|
398 |
} |
|
399 |
||
400 |
void ParScanThreadStateSet::print_termination_stats(outputStream* const st) |
|
401 |
{ |
|
402 |
print_termination_stats_hdr(st); |
|
403 |
||
404 |
for (int i = 0; i < length(); ++i) { |
|
405 |
const ParScanThreadState & pss = thread_state(i); |
|
406 |
const double elapsed_ms = pss.elapsed_time() * 1000.0; |
|
407 |
const double s_roots_ms = pss.strong_roots_time() * 1000.0; |
|
408 |
const double term_ms = pss.term_time() * 1000.0; |
|
409 |
st->print_cr("%3d %9.2f %9.2f %6.2f " |
|
410 |
"%9.2f %6.2f " SIZE_FORMAT_W(8), |
|
411 |
i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, |
|
412 |
term_ms, term_ms * 100 / elapsed_ms, pss.term_attempts()); |
|
413 |
} |
|
414 |
} |
|
415 |
||
416 |
// Print stats related to work queue activity. |
|
417 |
void ParScanThreadStateSet::print_taskqueue_stats_hdr(outputStream* const st) |
|
418 |
{ |
|
419 |
st->print_raw_cr("GC Task Stats"); |
|
420 |
st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); |
|
421 |
st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); |
|
422 |
} |
|
423 |
||
424 |
void ParScanThreadStateSet::print_taskqueue_stats(outputStream* const st) |
|
425 |
{ |
|
426 |
print_taskqueue_stats_hdr(st); |
|
427 |
||
428 |
TaskQueueStats totals; |
|
429 |
for (int i = 0; i < length(); ++i) { |
|
430 |
const ParScanThreadState & pss = thread_state(i); |
|
431 |
const TaskQueueStats & stats = pss.taskqueue_stats(); |
|
432 |
st->print("%3d ", i); stats.print(st); st->cr(); |
|
433 |
totals += stats; |
|
434 |
||
435 |
if (pss.overflow_refills() > 0) { |
|
436 |
st->print_cr(" " SIZE_FORMAT_W(10) " overflow refills " |
|
437 |
SIZE_FORMAT_W(10) " overflow objects", |
|
438 |
pss.overflow_refills(), pss.overflow_refill_objs()); |
|
439 |
} |
|
440 |
} |
|
441 |
st->print("tot "); totals.print(st); st->cr(); |
|
442 |
||
443 |
DEBUG_ONLY(totals.verify()); |
|
444 |
} |
|
445 |
#endif // TASKQUEUE_STATS |
|
446 |
||
1 | 447 |
void ParScanThreadStateSet::flush() |
448 |
{ |
|
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|
449 |
// Work in this loop should be kept as lightweight as |
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|
450 |
// possible since this might otherwise become a bottleneck |
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|
451 |
// to scaling. Should we add heavy-weight work into this |
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|
452 |
// loop, consider parallelizing the loop into the worker threads. |
1 | 453 |
for (int i = 0; i < length(); ++i) { |
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|
454 |
ParScanThreadState& par_scan_state = thread_state(i); |
1 | 455 |
|
456 |
// Flush stats related to To-space PLAB activity and |
|
457 |
// retire the last buffer. |
|
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|
458 |
par_scan_state.to_space_alloc_buffer()->flush_and_retire_stats(_gen.plab_stats()); |
1 | 459 |
|
460 |
// Every thread has its own age table. We need to merge |
|
461 |
// them all into one. |
|
462 |
ageTable *local_table = par_scan_state.age_table(); |
|
463 |
_gen.age_table()->merge(local_table); |
|
464 |
||
465 |
// Inform old gen that we're done. |
|
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|
466 |
_old_gen.par_promote_alloc_done(i); |
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|
467 |
_old_gen.par_oop_since_save_marks_iterate_done(i); |
6252 | 468 |
} |
1 | 469 |
|
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|
470 |
if (UseConcMarkSweepGC) { |
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|
471 |
// We need to call this even when ResizeOldPLAB is disabled |
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|
472 |
// so as to avoid breaking some asserts. While we may be able |
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|
473 |
// to avoid this by reorganizing the code a bit, I am loathe |
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|
474 |
// to do that unless we find cases where ergo leads to bad |
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|
475 |
// performance. |
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|
476 |
CFLS_LAB::compute_desired_plab_size(); |
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|
477 |
} |
1 | 478 |
} |
479 |
||
480 |
ParScanClosure::ParScanClosure(ParNewGeneration* g, |
|
481 |
ParScanThreadState* par_scan_state) : |
|
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|
482 |
OopsInKlassOrGenClosure(g), _par_scan_state(par_scan_state), _g(g) |
1 | 483 |
{ |
484 |
assert(_g->level() == 0, "Optimized for youngest generation"); |
|
485 |
_boundary = _g->reserved().end(); |
|
486 |
} |
|
487 |
||
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|
488 |
void ParScanWithBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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|
489 |
void ParScanWithBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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|
490 |
|
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|
491 |
void ParScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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|
492 |
void ParScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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|
493 |
|
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|
494 |
void ParRootScanWithBarrierTwoGensClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, true); } |
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|
495 |
void ParRootScanWithBarrierTwoGensClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, true); } |
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|
496 |
|
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|
497 |
void ParRootScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, true); } |
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|
498 |
void ParRootScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, true); } |
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|
499 |
|
1 | 500 |
ParScanWeakRefClosure::ParScanWeakRefClosure(ParNewGeneration* g, |
501 |
ParScanThreadState* par_scan_state) |
|
502 |
: ScanWeakRefClosure(g), _par_scan_state(par_scan_state) |
|
360
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|
503 |
{} |
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|
504 |
|
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|
505 |
void ParScanWeakRefClosure::do_oop(oop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
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|
506 |
void ParScanWeakRefClosure::do_oop(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
1 | 507 |
|
508 |
#ifdef WIN32 |
|
509 |
#pragma warning(disable: 4786) /* identifier was truncated to '255' characters in the browser information */ |
|
510 |
#endif |
|
511 |
||
512 |
ParEvacuateFollowersClosure::ParEvacuateFollowersClosure( |
|
513 |
ParScanThreadState* par_scan_state_, |
|
514 |
ParScanWithoutBarrierClosure* to_space_closure_, |
|
515 |
ParScanWithBarrierClosure* old_gen_closure_, |
|
516 |
ParRootScanWithoutBarrierClosure* to_space_root_closure_, |
|
517 |
ParNewGeneration* par_gen_, |
|
518 |
ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure_, |
|
519 |
ObjToScanQueueSet* task_queues_, |
|
520 |
ParallelTaskTerminator* terminator_) : |
|
521 |
||
522 |
_par_scan_state(par_scan_state_), |
|
523 |
_to_space_closure(to_space_closure_), |
|
524 |
_old_gen_closure(old_gen_closure_), |
|
525 |
_to_space_root_closure(to_space_root_closure_), |
|
526 |
_old_gen_root_closure(old_gen_root_closure_), |
|
527 |
_par_gen(par_gen_), |
|
528 |
_task_queues(task_queues_), |
|
529 |
_terminator(terminator_) |
|
530 |
{} |
|
531 |
||
532 |
void ParEvacuateFollowersClosure::do_void() { |
|
533 |
ObjToScanQueue* work_q = par_scan_state()->work_queue(); |
|
534 |
||
535 |
while (true) { |
|
536 |
||
537 |
// Scan to-space and old-gen objs until we run out of both. |
|
538 |
oop obj_to_scan; |
|
539 |
par_scan_state()->trim_queues(0); |
|
540 |
||
541 |
// We have no local work, attempt to steal from other threads. |
|
542 |
||
543 |
// attempt to steal work from promoted. |
|
544 |
if (task_queues()->steal(par_scan_state()->thread_num(), |
|
545 |
par_scan_state()->hash_seed(), |
|
546 |
obj_to_scan)) { |
|
547 |
bool res = work_q->push(obj_to_scan); |
|
548 |
assert(res, "Empty queue should have room for a push."); |
|
549 |
||
550 |
// if successful, goto Start. |
|
551 |
continue; |
|
552 |
||
553 |
// try global overflow list. |
|
554 |
} else if (par_gen()->take_from_overflow_list(par_scan_state())) { |
|
555 |
continue; |
|
556 |
} |
|
557 |
||
558 |
// Otherwise, offer termination. |
|
559 |
par_scan_state()->start_term_time(); |
|
560 |
if (terminator()->offer_termination()) break; |
|
561 |
par_scan_state()->end_term_time(); |
|
562 |
} |
|
1910 | 563 |
assert(par_gen()->_overflow_list == NULL && par_gen()->_num_par_pushes == 0, |
564 |
"Broken overflow list?"); |
|
1 | 565 |
// Finish the last termination pause. |
566 |
par_scan_state()->end_term_time(); |
|
567 |
} |
|
568 |
||
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|
569 |
ParNewGenTask::ParNewGenTask(ParNewGeneration* gen, Generation* old_gen, |
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changeset
|
570 |
HeapWord* young_old_boundary, ParScanThreadStateSet* state_set, |
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|
571 |
StrongRootsScope* strong_roots_scope) : |
1 | 572 |
AbstractGangTask("ParNewGeneration collection"), |
29684
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changeset
|
573 |
_gen(gen), _old_gen(old_gen), |
1 | 574 |
_young_old_boundary(young_old_boundary), |
30868
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changeset
|
575 |
_state_set(state_set), |
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changeset
|
576 |
_strong_roots_scope(strong_roots_scope) |
1 | 577 |
{} |
578 |
||
11174
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|
579 |
// Reset the terminator for the given number of |
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|
580 |
// active threads. |
30585 | 581 |
void ParNewGenTask::set_for_termination(uint active_workers) { |
11174
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|
582 |
_state_set->reset(active_workers, _gen->promotion_failed()); |
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|
583 |
} |
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changeset
|
584 |
|
11396
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changeset
|
585 |
void ParNewGenTask::work(uint worker_id) { |
1 | 586 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
587 |
// Since this is being done in a separate thread, need new resource |
|
588 |
// and handle marks. |
|
589 |
ResourceMark rm; |
|
590 |
HandleMark hm; |
|
591 |
||
11396
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|
592 |
ParScanThreadState& par_scan_state = _state_set->thread_state(worker_id); |
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|
593 |
assert(_state_set->is_valid(worker_id), "Should not have been called"); |
11174
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|
594 |
|
1 | 595 |
par_scan_state.set_young_old_boundary(_young_old_boundary); |
596 |
||
13728
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changeset
|
597 |
KlassScanClosure klass_scan_closure(&par_scan_state.to_space_root_closure(), |
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|
598 |
gch->rem_set()->klass_rem_set()); |
25492
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stefank
parents:
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diff
changeset
|
599 |
CLDToKlassAndOopClosure cld_scan_closure(&klass_scan_closure, |
d27050bdfb04
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parents:
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diff
changeset
|
600 |
&par_scan_state.to_space_root_closure(), |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
601 |
false); |
13728
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diff
changeset
|
602 |
|
1 | 603 |
par_scan_state.start_strong_roots(); |
30868
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parents:
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diff
changeset
|
604 |
gch->gen_process_roots(_strong_roots_scope, |
c1b24f26deed
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diff
changeset
|
605 |
_gen->level(), |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
606 |
true, // Process younger gens, if any, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
607 |
// as strong roots. |
29693
fac175f7a466
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
mgerdin
parents:
29690
diff
changeset
|
608 |
GenCollectedHeap::SO_ScavengeCodeCache, |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
609 |
GenCollectedHeap::StrongAndWeakRoots, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
610 |
&par_scan_state.to_space_root_closure(), |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
611 |
&par_scan_state.older_gen_closure(), |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
612 |
&cld_scan_closure); |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
613 |
|
1 | 614 |
par_scan_state.end_strong_roots(); |
615 |
||
616 |
// "evacuate followers". |
|
617 |
par_scan_state.evacuate_followers_closure().do_void(); |
|
618 |
} |
|
619 |
||
620 |
#ifdef _MSC_VER |
|
621 |
#pragma warning( push ) |
|
622 |
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
|
623 |
#endif |
|
624 |
ParNewGeneration:: |
|
625 |
ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level) |
|
626 |
: DefNewGeneration(rs, initial_byte_size, level, "PCopy"), |
|
627 |
_overflow_list(NULL), |
|
628 |
_is_alive_closure(this), |
|
629 |
_plab_stats(YoungPLABSize, PLABWeight) |
|
630 |
{ |
|
1910 | 631 |
NOT_PRODUCT(_overflow_counter = ParGCWorkQueueOverflowInterval;) |
632 |
NOT_PRODUCT(_num_par_pushes = 0;) |
|
1 | 633 |
_task_queues = new ObjToScanQueueSet(ParallelGCThreads); |
634 |
guarantee(_task_queues != NULL, "task_queues allocation failure."); |
|
635 |
||
636 |
for (uint i1 = 0; i1 < ParallelGCThreads; i1++) { |
|
6067 | 637 |
ObjToScanQueue *q = new ObjToScanQueue(); |
638 |
guarantee(q != NULL, "work_queue Allocation failure."); |
|
639 |
_task_queues->register_queue(i1, q); |
|
1 | 640 |
} |
641 |
||
642 |
for (uint i2 = 0; i2 < ParallelGCThreads; i2++) |
|
643 |
_task_queues->queue(i2)->initialize(); |
|
644 |
||
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
6759
diff
changeset
|
645 |
_overflow_stacks = NULL; |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
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diff
changeset
|
646 |
if (ParGCUseLocalOverflow) { |
13195 | 647 |
|
648 |
// typedef to workaround NEW_C_HEAP_ARRAY macro, which can not deal |
|
649 |
// with ',' |
|
650 |
typedef Stack<oop, mtGC> GCOopStack; |
|
651 |
||
652 |
_overflow_stacks = NEW_C_HEAP_ARRAY(GCOopStack, ParallelGCThreads, mtGC); |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
6759
diff
changeset
|
653 |
for (size_t i = 0; i < ParallelGCThreads; ++i) { |
13195 | 654 |
new (_overflow_stacks + i) Stack<oop, mtGC>(); |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
655 |
} |
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
656 |
} |
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
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parents:
2346
diff
changeset
|
657 |
|
1 | 658 |
if (UsePerfData) { |
659 |
EXCEPTION_MARK; |
|
660 |
ResourceMark rm; |
|
661 |
||
662 |
const char* cname = |
|
663 |
PerfDataManager::counter_name(_gen_counters->name_space(), "threads"); |
|
664 |
PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, |
|
665 |
ParallelGCThreads, CHECK); |
|
666 |
} |
|
667 |
} |
|
668 |
#ifdef _MSC_VER |
|
669 |
#pragma warning( pop ) |
|
670 |
#endif |
|
671 |
||
672 |
// ParNewGeneration:: |
|
673 |
ParKeepAliveClosure::ParKeepAliveClosure(ParScanWeakRefClosure* cl) : |
|
674 |
DefNewGeneration::KeepAliveClosure(cl), _par_cl(cl) {} |
|
675 |
||
360
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|
676 |
template <class T> |
21d113ecbf6a
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|
677 |
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop_work(T* p) { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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diff
changeset
|
678 |
#ifdef ASSERT |
21d113ecbf6a
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diff
changeset
|
679 |
{ |
21d113ecbf6a
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diff
changeset
|
680 |
assert(!oopDesc::is_null(*p), "expected non-null ref"); |
21d113ecbf6a
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diff
changeset
|
681 |
oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
21d113ecbf6a
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diff
changeset
|
682 |
// We never expect to see a null reference being processed |
21d113ecbf6a
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diff
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|
683 |
// as a weak reference. |
21d113ecbf6a
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diff
changeset
|
684 |
assert(obj->is_oop(), "expected an oop while scanning weak refs"); |
21d113ecbf6a
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coleenp
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diff
changeset
|
685 |
} |
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diff
changeset
|
686 |
#endif // ASSERT |
1 | 687 |
|
688 |
_par_cl->do_oop_nv(p); |
|
689 |
||
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
30155
diff
changeset
|
690 |
if (GenCollectedHeap::heap()->is_in_reserved(p)) { |
360
21d113ecbf6a
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parents:
179
diff
changeset
|
691 |
oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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diff
changeset
|
692 |
_rs->write_ref_field_gc_par(p, obj); |
1 | 693 |
} |
694 |
} |
|
695 |
||
360
21d113ecbf6a
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diff
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|
696 |
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(oop* p) { ParKeepAliveClosure::do_oop_work(p); } |
21d113ecbf6a
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diff
changeset
|
697 |
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(narrowOop* p) { ParKeepAliveClosure::do_oop_work(p); } |
21d113ecbf6a
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diff
changeset
|
698 |
|
1 | 699 |
// ParNewGeneration:: |
700 |
KeepAliveClosure::KeepAliveClosure(ScanWeakRefClosure* cl) : |
|
701 |
DefNewGeneration::KeepAliveClosure(cl) {} |
|
702 |
||
360
21d113ecbf6a
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diff
changeset
|
703 |
template <class T> |
21d113ecbf6a
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coleenp
parents:
179
diff
changeset
|
704 |
void /*ParNewGeneration::*/KeepAliveClosure::do_oop_work(T* p) { |
21d113ecbf6a
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parents:
179
diff
changeset
|
705 |
#ifdef ASSERT |
21d113ecbf6a
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parents:
179
diff
changeset
|
706 |
{ |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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parents:
179
diff
changeset
|
707 |
assert(!oopDesc::is_null(*p), "expected non-null ref"); |
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179
diff
changeset
|
708 |
oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
21d113ecbf6a
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diff
changeset
|
709 |
// We never expect to see a null reference being processed |
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parents:
179
diff
changeset
|
710 |
// as a weak reference. |
21d113ecbf6a
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parents:
179
diff
changeset
|
711 |
assert(obj->is_oop(), "expected an oop while scanning weak refs"); |
21d113ecbf6a
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coleenp
parents:
179
diff
changeset
|
712 |
} |
21d113ecbf6a
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parents:
179
diff
changeset
|
713 |
#endif // ASSERT |
1 | 714 |
|
715 |
_cl->do_oop_nv(p); |
|
716 |
||
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
30155
diff
changeset
|
717 |
if (GenCollectedHeap::heap()->is_in_reserved(p)) { |
360
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changeset
|
718 |
oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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changeset
|
719 |
_rs->write_ref_field_gc_par(p, obj); |
1 | 720 |
} |
721 |
} |
|
722 |
||
360
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changeset
|
723 |
void /*ParNewGeneration::*/KeepAliveClosure::do_oop(oop* p) { KeepAliveClosure::do_oop_work(p); } |
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changeset
|
724 |
void /*ParNewGeneration::*/KeepAliveClosure::do_oop(narrowOop* p) { KeepAliveClosure::do_oop_work(p); } |
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changeset
|
725 |
|
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diff
changeset
|
726 |
template <class T> void ScanClosureWithParBarrier::do_oop_work(T* p) { |
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changeset
|
727 |
T heap_oop = oopDesc::load_heap_oop(p); |
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changeset
|
728 |
if (!oopDesc::is_null(heap_oop)) { |
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changeset
|
729 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
1 | 730 |
if ((HeapWord*)obj < _boundary) { |
731 |
assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); |
|
360
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changeset
|
732 |
oop new_obj = obj->is_forwarded() |
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diff
changeset
|
733 |
? obj->forwardee() |
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diff
changeset
|
734 |
: _g->DefNewGeneration::copy_to_survivor_space(obj); |
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diff
changeset
|
735 |
oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
1 | 736 |
} |
737 |
if (_gc_barrier) { |
|
738 |
// If p points to a younger generation, mark the card. |
|
739 |
if ((HeapWord*)obj < _gen_boundary) { |
|
740 |
_rs->write_ref_field_gc_par(p, obj); |
|
741 |
} |
|
742 |
} |
|
743 |
} |
|
744 |
} |
|
745 |
||
360
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changeset
|
746 |
void ScanClosureWithParBarrier::do_oop(oop* p) { ScanClosureWithParBarrier::do_oop_work(p); } |
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changeset
|
747 |
void ScanClosureWithParBarrier::do_oop(narrowOop* p) { ScanClosureWithParBarrier::do_oop_work(p); } |
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changeset
|
748 |
|
1 | 749 |
class ParNewRefProcTaskProxy: public AbstractGangTask { |
750 |
typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
751 |
public: |
|
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diff
changeset
|
752 |
ParNewRefProcTaskProxy(ProcessTask& task, |
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parents:
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diff
changeset
|
753 |
ParNewGeneration& gen, |
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parents:
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diff
changeset
|
754 |
Generation& old_gen, |
1 | 755 |
HeapWord* young_old_boundary, |
756 |
ParScanThreadStateSet& state_set); |
|
757 |
||
758 |
private: |
|
11396
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diff
changeset
|
759 |
virtual void work(uint worker_id); |
30585 | 760 |
virtual void set_for_termination(uint active_workers) { |
11174
fccee5238e70
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parents:
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diff
changeset
|
761 |
_state_set.terminator()->reset_for_reuse(active_workers); |
fccee5238e70
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diff
changeset
|
762 |
} |
1 | 763 |
private: |
764 |
ParNewGeneration& _gen; |
|
765 |
ProcessTask& _task; |
|
29684
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diff
changeset
|
766 |
Generation& _old_gen; |
1 | 767 |
HeapWord* _young_old_boundary; |
768 |
ParScanThreadStateSet& _state_set; |
|
769 |
}; |
|
770 |
||
29684
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diff
changeset
|
771 |
ParNewRefProcTaskProxy::ParNewRefProcTaskProxy(ProcessTask& task, |
a36d90acae41
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parents:
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diff
changeset
|
772 |
ParNewGeneration& gen, |
a36d90acae41
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parents:
29327
diff
changeset
|
773 |
Generation& old_gen, |
a36d90acae41
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parents:
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diff
changeset
|
774 |
HeapWord* young_old_boundary, |
a36d90acae41
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jwilhelm
parents:
29327
diff
changeset
|
775 |
ParScanThreadStateSet& state_set) |
1 | 776 |
: AbstractGangTask("ParNewGeneration parallel reference processing"), |
777 |
_gen(gen), |
|
778 |
_task(task), |
|
29684
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parents:
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diff
changeset
|
779 |
_old_gen(old_gen), |
1 | 780 |
_young_old_boundary(young_old_boundary), |
781 |
_state_set(state_set) |
|
782 |
{ |
|
783 |
} |
|
784 |
||
11396
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jmasa
parents:
11174
diff
changeset
|
785 |
void ParNewRefProcTaskProxy::work(uint worker_id) |
1 | 786 |
{ |
787 |
ResourceMark rm; |
|
788 |
HandleMark hm; |
|
11396
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jmasa
parents:
11174
diff
changeset
|
789 |
ParScanThreadState& par_scan_state = _state_set.thread_state(worker_id); |
1 | 790 |
par_scan_state.set_young_old_boundary(_young_old_boundary); |
11396
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jmasa
parents:
11174
diff
changeset
|
791 |
_task.work(worker_id, par_scan_state.is_alive_closure(), |
1 | 792 |
par_scan_state.keep_alive_closure(), |
793 |
par_scan_state.evacuate_followers_closure()); |
|
794 |
} |
|
795 |
||
796 |
class ParNewRefEnqueueTaskProxy: public AbstractGangTask { |
|
797 |
typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
798 |
EnqueueTask& _task; |
|
799 |
||
800 |
public: |
|
801 |
ParNewRefEnqueueTaskProxy(EnqueueTask& task) |
|
802 |
: AbstractGangTask("ParNewGeneration parallel reference enqueue"), |
|
803 |
_task(task) |
|
804 |
{ } |
|
805 |
||
11396
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jmasa
parents:
11174
diff
changeset
|
806 |
virtual void work(uint worker_id) |
1 | 807 |
{ |
11396
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jmasa
parents:
11174
diff
changeset
|
808 |
_task.work(worker_id); |
1 | 809 |
} |
810 |
}; |
|
811 |
||
812 |
||
813 |
void ParNewRefProcTaskExecutor::execute(ProcessTask& task) |
|
814 |
{ |
|
815 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
816 |
FlexibleWorkGang* workers = gch->workers(); |
1 | 817 |
assert(workers != NULL, "Need parallel worker threads."); |
11174
fccee5238e70
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jmasa
parents:
8688
diff
changeset
|
818 |
_state_set.reset(workers->active_workers(), _generation.promotion_failed()); |
1 | 819 |
ParNewRefProcTaskProxy rp_task(task, _generation, *_generation.next_gen(), |
820 |
_generation.reserved().end(), _state_set); |
|
821 |
workers->run_task(&rp_task); |
|
11174
fccee5238e70
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jmasa
parents:
8688
diff
changeset
|
822 |
_state_set.reset(0 /* bad value in debug if not reset */, |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
823 |
_generation.promotion_failed()); |
1 | 824 |
} |
825 |
||
826 |
void ParNewRefProcTaskExecutor::execute(EnqueueTask& task) |
|
827 |
{ |
|
828 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
11174
fccee5238e70
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jmasa
parents:
8688
diff
changeset
|
829 |
FlexibleWorkGang* workers = gch->workers(); |
1 | 830 |
assert(workers != NULL, "Need parallel worker threads."); |
831 |
ParNewRefEnqueueTaskProxy enq_task(task); |
|
832 |
workers->run_task(&enq_task); |
|
833 |
} |
|
834 |
||
835 |
void ParNewRefProcTaskExecutor::set_single_threaded_mode() |
|
836 |
{ |
|
837 |
_state_set.flush(); |
|
838 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
839 |
gch->set_par_threads(0); // 0 ==> non-parallel. |
|
840 |
gch->save_marks(); |
|
841 |
} |
|
842 |
||
843 |
ScanClosureWithParBarrier:: |
|
844 |
ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier) : |
|
845 |
ScanClosure(g, gc_barrier) {} |
|
846 |
||
847 |
EvacuateFollowersClosureGeneral:: |
|
848 |
EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level, |
|
849 |
OopsInGenClosure* cur, |
|
850 |
OopsInGenClosure* older) : |
|
851 |
_gch(gch), _level(level), |
|
852 |
_scan_cur_or_nonheap(cur), _scan_older(older) |
|
853 |
{} |
|
854 |
||
855 |
void EvacuateFollowersClosureGeneral::do_void() { |
|
856 |
do { |
|
857 |
// Beware: this call will lead to closure applications via virtual |
|
858 |
// calls. |
|
859 |
_gch->oop_since_save_marks_iterate(_level, |
|
860 |
_scan_cur_or_nonheap, |
|
861 |
_scan_older); |
|
862 |
} while (!_gch->no_allocs_since_save_marks(_level)); |
|
863 |
} |
|
864 |
||
865 |
||
18025 | 866 |
// A Generation that does parallel young-gen collection. |
867 |
||
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
868 |
void ParNewGeneration::handle_promotion_failed(GenCollectedHeap* gch, ParScanThreadStateSet& thread_state_set) { |
18025 | 869 |
assert(_promo_failure_scan_stack.is_empty(), "post condition"); |
870 |
_promo_failure_scan_stack.clear(true); // Clear cached segments. |
|
871 |
||
872 |
remove_forwarding_pointers(); |
|
873 |
if (PrintGCDetails) { |
|
874 |
gclog_or_tty->print(" (promotion failed)"); |
|
875 |
} |
|
876 |
// All the spaces are in play for mark-sweep. |
|
877 |
swap_spaces(); // Make life simpler for CMS || rescan; see 6483690. |
|
878 |
from()->set_next_compaction_space(to()); |
|
879 |
gch->set_incremental_collection_failed(); |
|
880 |
// Inform the next generation that a promotion failure occurred. |
|
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29327
diff
changeset
|
881 |
_old_gen->promotion_failure_occurred(); |
18025 | 882 |
|
883 |
// Trace promotion failure in the parallel GC threads |
|
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
884 |
thread_state_set.trace_promotion_failed(gc_tracer()); |
18025 | 885 |
// Single threaded code may have reported promotion failure to the global state |
886 |
if (_promotion_failed_info.has_failed()) { |
|
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
887 |
_gc_tracer.report_promotion_failed(_promotion_failed_info); |
18025 | 888 |
} |
889 |
// Reset the PromotionFailureALot counters. |
|
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
30155
diff
changeset
|
890 |
NOT_PRODUCT(gch->reset_promotion_should_fail();) |
18025 | 891 |
} |
1 | 892 |
|
893 |
void ParNewGeneration::collect(bool full, |
|
894 |
bool clear_all_soft_refs, |
|
895 |
size_t size, |
|
896 |
bool is_tlab) { |
|
897 |
assert(full || size > 0, "otherwise we don't want to collect"); |
|
18025 | 898 |
|
1 | 899 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
18025 | 900 |
|
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
20282
diff
changeset
|
901 |
_gc_timer->register_gc_start(); |
18025 | 902 |
|
1 | 903 |
AdaptiveSizePolicy* size_policy = gch->gen_policy()->size_policy(); |
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
904 |
FlexibleWorkGang* workers = gch->workers(); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
905 |
assert(workers != NULL, "Need workgang for parallel work"); |
30585 | 906 |
uint active_workers = |
907 |
AdaptiveSizePolicy::calc_active_workers(workers->total_workers(), |
|
908 |
workers->active_workers(), |
|
909 |
Threads::number_of_non_daemon_threads()); |
|
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
910 |
workers->set_active_workers(active_workers); |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29327
diff
changeset
|
911 |
_old_gen = gch->old_gen(); |
1 | 912 |
|
18025 | 913 |
// If the next generation is too full to accommodate worst-case promotion |
1 | 914 |
// from this generation, pass on collection; let the next generation |
915 |
// do it. |
|
916 |
if (!collection_attempt_is_safe()) { |
|
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6762
diff
changeset
|
917 |
gch->set_incremental_collection_failed(); // slight lie, in that we did not even attempt one |
1 | 918 |
return; |
919 |
} |
|
920 |
assert(to()->is_empty(), "Else not collection_attempt_is_safe"); |
|
921 |
||
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
922 |
_gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start()); |
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
923 |
gch->trace_heap_before_gc(gc_tracer()); |
18025 | 924 |
|
1 | 925 |
init_assuming_no_promotion_failure(); |
926 |
||
927 |
if (UseAdaptiveSizePolicy) { |
|
928 |
set_survivor_overflow(false); |
|
929 |
size_policy->minor_collection_begin(); |
|
930 |
} |
|
931 |
||
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
932 |
GCTraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL, _gc_tracer.gc_id()); |
1 | 933 |
// Capture heap used before collection (for printing). |
934 |
size_t gch_prev_used = gch->used(); |
|
935 |
||
936 |
age_table()->clear(); |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
937 |
to()->clear(SpaceDecorator::Mangle); |
1 | 938 |
|
939 |
gch->save_marks(); |
|
940 |
assert(workers != NULL, "Need parallel worker threads."); |
|
30585 | 941 |
uint n_workers = active_workers; |
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
942 |
|
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
943 |
// Set the correct parallelism (number of queues) in the reference processor |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
944 |
ref_processor()->set_active_mt_degree(n_workers); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
945 |
|
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
946 |
// Always set the terminator for the active number of workers |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
947 |
// because only those workers go through the termination protocol. |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
948 |
ParallelTaskTerminator _term(n_workers, task_queues()); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
949 |
ParScanThreadStateSet thread_state_set(workers->active_workers(), |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29327
diff
changeset
|
950 |
*to(), *this, *_old_gen, *task_queues(), |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
951 |
_overflow_stacks, desired_plab_sz(), _term); |
1 | 952 |
|
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
953 |
{ |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
954 |
StrongRootsScope srs(n_workers); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
955 |
|
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
956 |
ParNewGenTask tsk(this, _old_gen, reserved().end(), &thread_state_set, &srs); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
957 |
gch->set_par_threads(n_workers); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
958 |
gch->rem_set()->prepare_for_younger_refs_iterate(true); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
959 |
// It turns out that even when we're using 1 thread, doing the work in a |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
960 |
// separate thread causes wide variance in run times. We can't help this |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
961 |
// in the multi-threaded case, but we special-case n=1 here to get |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
962 |
// repeatable measurements of the 1-thread overhead of the parallel code. |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
963 |
if (n_workers > 1) { |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
964 |
workers->run_task(&tsk); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
965 |
} else { |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
966 |
tsk.work(0); |
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
967 |
} |
1 | 968 |
} |
30868
c1b24f26deed
8080110: Remove usage of CollectedHeap::n_par_threads() from root processing
stefank
parents:
30764
diff
changeset
|
969 |
|
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
970 |
thread_state_set.reset(0 /* Bad value in debug if not reset */, |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
971 |
promotion_failed()); |
1 | 972 |
|
27895
bf55adf78eeb
8055239: assert(_thread == Thread::current()->osthread()) failed: The PromotionFailedInfo should be thread local
sangheki
parents:
27251
diff
changeset
|
973 |
// Trace and reset failed promotion info. |
bf55adf78eeb
8055239: assert(_thread == Thread::current()->osthread()) failed: The PromotionFailedInfo should be thread local
sangheki
parents:
27251
diff
changeset
|
974 |
if (promotion_failed()) { |
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
975 |
thread_state_set.trace_promotion_failed(gc_tracer()); |
27895
bf55adf78eeb
8055239: assert(_thread == Thread::current()->osthread()) failed: The PromotionFailedInfo should be thread local
sangheki
parents:
27251
diff
changeset
|
976 |
} |
bf55adf78eeb
8055239: assert(_thread == Thread::current()->osthread()) failed: The PromotionFailedInfo should be thread local
sangheki
parents:
27251
diff
changeset
|
977 |
|
1 | 978 |
// Process (weak) reference objects found during scavenge. |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
979 |
ReferenceProcessor* rp = ref_processor(); |
1 | 980 |
IsAliveClosure is_alive(this); |
981 |
ScanWeakRefClosure scan_weak_ref(this); |
|
982 |
KeepAliveClosure keep_alive(&scan_weak_ref); |
|
983 |
ScanClosure scan_without_gc_barrier(this, false); |
|
984 |
ScanClosureWithParBarrier scan_with_gc_barrier(this, true); |
|
985 |
set_promo_failure_scan_stack_closure(&scan_without_gc_barrier); |
|
986 |
EvacuateFollowersClosureGeneral evacuate_followers(gch, _level, |
|
987 |
&scan_without_gc_barrier, &scan_with_gc_barrier); |
|
1610
5dddd195cc86
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
1607
diff
changeset
|
988 |
rp->setup_policy(clear_all_soft_refs); |
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
989 |
// Can the mt_degree be set later (at run_task() time would be best)? |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
990 |
rp->set_active_mt_degree(active_workers); |
18025 | 991 |
ReferenceProcessorStats stats; |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
992 |
if (rp->processing_is_mt()) { |
1 | 993 |
ParNewRefProcTaskExecutor task_executor(*this, thread_state_set); |
18025 | 994 |
stats = rp->process_discovered_references(&is_alive, &keep_alive, |
995 |
&evacuate_followers, &task_executor, |
|
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
996 |
_gc_timer, _gc_tracer.gc_id()); |
1 | 997 |
} else { |
998 |
thread_state_set.flush(); |
|
999 |
gch->set_par_threads(0); // 0 ==> non-parallel. |
|
1000 |
gch->save_marks(); |
|
18025 | 1001 |
stats = rp->process_discovered_references(&is_alive, &keep_alive, |
1002 |
&evacuate_followers, NULL, |
|
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
1003 |
_gc_timer, _gc_tracer.gc_id()); |
1 | 1004 |
} |
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
1005 |
_gc_tracer.report_gc_reference_stats(stats); |
1 | 1006 |
if (!promotion_failed()) { |
1007 |
// Swap the survivor spaces. |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1008 |
eden()->clear(SpaceDecorator::Mangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1009 |
from()->clear(SpaceDecorator::Mangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1010 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1011 |
// This is now done here because of the piece-meal mangling which |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1012 |
// can check for valid mangling at intermediate points in the |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1013 |
// collection(s). When a minor collection fails to collect |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1014 |
// sufficient space resizing of the young generation can occur |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1015 |
// an redistribute the spaces in the young generation. Mangle |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1016 |
// here so that unzapped regions don't get distributed to |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1017 |
// other spaces. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1018 |
to()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1019 |
} |
1 | 1020 |
swap_spaces(); |
1021 |
||
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
1022 |
// A successful scavenge should restart the GC time limit count which is |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
1023 |
// for full GC's. |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
1024 |
size_policy->reset_gc_overhead_limit_count(); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
1025 |
|
1 | 1026 |
assert(to()->is_empty(), "to space should be empty now"); |
15215
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
15091
diff
changeset
|
1027 |
|
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
15091
diff
changeset
|
1028 |
adjust_desired_tenuring_threshold(); |
1 | 1029 |
} else { |
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
1030 |
handle_promotion_failed(gch, thread_state_set); |
1 | 1031 |
} |
1032 |
// set new iteration safe limit for the survivor spaces |
|
1033 |
from()->set_concurrent_iteration_safe_limit(from()->top()); |
|
1034 |
to()->set_concurrent_iteration_safe_limit(to()->top()); |
|
1035 |
||
1036 |
if (ResizePLAB) { |
|
30586
23e6e981e89c
8079556: BACKOUT - Determining the desired PLAB size adjusts to the the number of threads at the wrong place
tschatzl
parents:
30585
diff
changeset
|
1037 |
plab_stats()->adjust_desired_plab_sz(n_workers); |
1 | 1038 |
} |
1039 |
||
1040 |
if (PrintGC && !PrintGCDetails) { |
|
1041 |
gch->print_heap_change(gch_prev_used); |
|
1042 |
} |
|
1043 |
||
27154
ccf8883e01be
8027428: Different conditions for printing taskqueue statistics for parallel gc, parNew and G1
jwilhelm
parents:
25905
diff
changeset
|
1044 |
TASKQUEUE_STATS_ONLY(if (PrintTerminationStats) thread_state_set.print_termination_stats()); |
ccf8883e01be
8027428: Different conditions for printing taskqueue statistics for parallel gc, parNew and G1
jwilhelm
parents:
25905
diff
changeset
|
1045 |
TASKQUEUE_STATS_ONLY(if (PrintTaskqueue) thread_state_set.print_taskqueue_stats()); |
6252 | 1046 |
|
1 | 1047 |
if (UseAdaptiveSizePolicy) { |
1048 |
size_policy->minor_collection_end(gch->gc_cause()); |
|
1049 |
size_policy->avg_survived()->sample(from()->used()); |
|
1050 |
} |
|
1051 |
||
22551 | 1052 |
// We need to use a monotonically non-decreasing time in ms |
11755 | 1053 |
// or we will see time-warp warnings and os::javaTimeMillis() |
1054 |
// does not guarantee monotonicity. |
|
1055 |
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
|
1056 |
update_time_of_last_gc(now); |
|
1 | 1057 |
|
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1058 |
rp->set_enqueuing_is_done(true); |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1059 |
if (rp->processing_is_mt()) { |
1 | 1060 |
ParNewRefProcTaskExecutor task_executor(*this, thread_state_set); |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1061 |
rp->enqueue_discovered_references(&task_executor); |
1 | 1062 |
} else { |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1063 |
rp->enqueue_discovered_references(NULL); |
1 | 1064 |
} |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1065 |
rp->verify_no_references_recorded(); |
18025 | 1066 |
|
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
1067 |
gch->trace_heap_after_gc(gc_tracer()); |
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
1068 |
_gc_tracer.report_tenuring_threshold(tenuring_threshold()); |
18025 | 1069 |
|
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
20282
diff
changeset
|
1070 |
_gc_timer->register_gc_end(); |
18025 | 1071 |
|
28940
c314cf1db3fa
8066566: Refactor ParNewGeneration to contain ParNewTracer
mlarsson
parents:
28630
diff
changeset
|
1072 |
_gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); |
1 | 1073 |
} |
1074 |
||
1075 |
static int sum; |
|
1076 |
void ParNewGeneration::waste_some_time() { |
|
1077 |
for (int i = 0; i < 100; i++) { |
|
1078 |
sum += i; |
|
1079 |
} |
|
1080 |
} |
|
1081 |
||
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1082 |
static const oop ClaimedForwardPtr = cast_to_oop<intptr_t>(0x4); |
1 | 1083 |
|
1084 |
// Because of concurrency, there are times where an object for which |
|
1085 |
// "is_forwarded()" is true contains an "interim" forwarding pointer |
|
1086 |
// value. Such a value will soon be overwritten with a real value. |
|
1087 |
// This method requires "obj" to have a forwarding pointer, and waits, if |
|
1088 |
// necessary for a real one to be inserted, and returns it. |
|
1089 |
||
1090 |
oop ParNewGeneration::real_forwardee(oop obj) { |
|
1091 |
oop forward_ptr = obj->forwardee(); |
|
1092 |
if (forward_ptr != ClaimedForwardPtr) { |
|
1093 |
return forward_ptr; |
|
1094 |
} else { |
|
1095 |
return real_forwardee_slow(obj); |
|
1096 |
} |
|
1097 |
} |
|
1098 |
||
1099 |
oop ParNewGeneration::real_forwardee_slow(oop obj) { |
|
1100 |
// Spin-read if it is claimed but not yet written by another thread. |
|
1101 |
oop forward_ptr = obj->forwardee(); |
|
1102 |
while (forward_ptr == ClaimedForwardPtr) { |
|
1103 |
waste_some_time(); |
|
1104 |
assert(obj->is_forwarded(), "precondition"); |
|
1105 |
forward_ptr = obj->forwardee(); |
|
1106 |
} |
|
1107 |
return forward_ptr; |
|
1108 |
} |
|
1109 |
||
1110 |
void ParNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { |
|
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7397
diff
changeset
|
1111 |
if (m->must_be_preserved_for_promotion_failure(obj)) { |
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7397
diff
changeset
|
1112 |
// We should really have separate per-worker stacks, rather |
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7397
diff
changeset
|
1113 |
// than use locking of a common pair of stacks. |
1 | 1114 |
MutexLocker ml(ParGCRareEvent_lock); |
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7397
diff
changeset
|
1115 |
preserve_mark(obj, m); |
1 | 1116 |
} |
1117 |
} |
|
1118 |
||
1119 |
// Multiple GC threads may try to promote an object. If the object |
|
1120 |
// is successfully promoted, a forwarding pointer will be installed in |
|
1121 |
// the object in the young generation. This method claims the right |
|
1122 |
// to install the forwarding pointer before it copies the object, |
|
1123 |
// thus avoiding the need to undo the copy as in |
|
1124 |
// copy_to_survivor_space_avoiding_with_undo. |
|
1125 |
||
27899
17754211a7ab
8066133: Fix missing reivew changes for JDK-8065972
brutisso
parents:
27895
diff
changeset
|
1126 |
oop ParNewGeneration::copy_to_survivor_space( |
1 | 1127 |
ParScanThreadState* par_scan_state, oop old, size_t sz, markOop m) { |
1128 |
// In the sequential version, this assert also says that the object is |
|
1129 |
// not forwarded. That might not be the case here. It is the case that |
|
1130 |
// the caller observed it to be not forwarded at some time in the past. |
|
1131 |
assert(is_in_reserved(old), "shouldn't be scavenging this oop"); |
|
1132 |
||
1133 |
// The sequential code read "old->age()" below. That doesn't work here, |
|
1134 |
// since the age is in the mark word, and that might be overwritten with |
|
1135 |
// a forwarding pointer by a parallel thread. So we must save the mark |
|
1136 |
// word in a local and then analyze it. |
|
1137 |
oopDesc dummyOld; |
|
1138 |
dummyOld.set_mark(m); |
|
1139 |
assert(!dummyOld.is_forwarded(), |
|
1140 |
"should not be called with forwarding pointer mark word."); |
|
1141 |
||
1142 |
oop new_obj = NULL; |
|
1143 |
oop forward_ptr; |
|
1144 |
||
1145 |
// Try allocating obj in to-space (unless too old) |
|
1146 |
if (dummyOld.age() < tenuring_threshold()) { |
|
1147 |
new_obj = (oop)par_scan_state->alloc_in_to_space(sz); |
|
1148 |
if (new_obj == NULL) { |
|
1149 |
set_survivor_overflow(true); |
|
1150 |
} |
|
1151 |
} |
|
1152 |
||
1153 |
if (new_obj == NULL) { |
|
1154 |
// Either to-space is full or we decided to promote |
|
1155 |
// try allocating obj tenured |
|
1156 |
||
1157 |
// Attempt to install a null forwarding pointer (atomically), |
|
1158 |
// to claim the right to install the real forwarding pointer. |
|
1159 |
forward_ptr = old->forward_to_atomic(ClaimedForwardPtr); |
|
1160 |
if (forward_ptr != NULL) { |
|
1161 |
// someone else beat us to it. |
|
1162 |
return real_forwardee(old); |
|
1163 |
} |
|
1164 |
||
28630
f140942b6fd8
8061259: ParNew promotion failed is serialized on a lock
brutisso
parents:
27905
diff
changeset
|
1165 |
if (!_promotion_failed) { |
29684
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29327
diff
changeset
|
1166 |
new_obj = _old_gen->par_promote(par_scan_state->thread_num(), |
a36d90acae41
8057632: Remove auxiliary code used to handle the generations array
jwilhelm
parents:
29327
diff
changeset
|
1167 |
old, m, sz); |
28630
f140942b6fd8
8061259: ParNew promotion failed is serialized on a lock
brutisso
parents:
27905
diff
changeset
|
1168 |
} |
1 | 1169 |
|
1170 |
if (new_obj == NULL) { |
|
1171 |
// promotion failed, forward to self |
|
1172 |
_promotion_failed = true; |
|
1173 |
new_obj = old; |
|
1174 |
||
1175 |
preserve_mark_if_necessary(old, m); |
|
18025 | 1176 |
par_scan_state->register_promotion_failure(sz); |
1 | 1177 |
} |
1178 |
||
1179 |
old->forward_to(new_obj); |
|
1180 |
forward_ptr = NULL; |
|
1181 |
} else { |
|
1182 |
// Is in to-space; do copying ourselves. |
|
1183 |
Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)new_obj, sz); |
|
30173
13cf7580b000
8077413: Avoid use of Universe::heap() inside collectors
pliden
parents:
30155
diff
changeset
|
1184 |
assert(GenCollectedHeap::heap()->is_in_reserved(new_obj), "illegal forwarding pointer value."); |
1 | 1185 |
forward_ptr = old->forward_to_atomic(new_obj); |
1186 |
// Restore the mark word copied above. |
|
1187 |
new_obj->set_mark(m); |
|
1188 |
// Increment age if obj still in new generation |
|
1189 |
new_obj->incr_age(); |
|
1190 |
par_scan_state->age_table()->add(new_obj, sz); |
|
1191 |
} |
|
1192 |
assert(new_obj != NULL, "just checking"); |
|
1193 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1194 |
#ifndef PRODUCT |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1195 |
// This code must come after the CAS test, or it will print incorrect |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1196 |
// information. |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1197 |
if (TraceScavenge) { |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1198 |
gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1199 |
is_in_reserved(new_obj) ? "copying" : "tenuring", |
29799
3ad47a56094a
8076072: parNew: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC needs to be removed from source files
david
parents:
29792
diff
changeset
|
1200 |
new_obj->klass()->internal_name(), p2i(old), p2i(new_obj), new_obj->size()); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1201 |
} |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1202 |
#endif |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1203 |
|
1 | 1204 |
if (forward_ptr == NULL) { |
1205 |
oop obj_to_push = new_obj; |
|
1206 |
if (par_scan_state->should_be_partially_scanned(obj_to_push, old)) { |
|
1207 |
// Length field used as index of next element to be scanned. |
|
1208 |
// Real length can be obtained from real_forwardee() |
|
1209 |
arrayOop(old)->set_length(0); |
|
1210 |
obj_to_push = old; |
|
1211 |
assert(obj_to_push->is_forwarded() && obj_to_push->forwardee() != obj_to_push, |
|
1212 |
"push forwarded object"); |
|
1213 |
} |
|
1214 |
// Push it on one of the queues of to-be-scanned objects. |
|
1910 | 1215 |
bool simulate_overflow = false; |
1216 |
NOT_PRODUCT( |
|
1217 |
if (ParGCWorkQueueOverflowALot && should_simulate_overflow()) { |
|
1218 |
// simulate a stack overflow |
|
1219 |
simulate_overflow = true; |
|
1220 |
} |
|
1221 |
) |
|
1222 |
if (simulate_overflow || !par_scan_state->work_queue()->push(obj_to_push)) { |
|
1 | 1223 |
// Add stats for overflow pushes. |
1224 |
if (Verbose && PrintGCDetails) { |
|
1225 |
gclog_or_tty->print("queue overflow!\n"); |
|
1226 |
} |
|
1910 | 1227 |
push_on_overflow_list(old, par_scan_state); |
6252 | 1228 |
TASKQUEUE_STATS_ONLY(par_scan_state->taskqueue_stats().record_overflow(0)); |
1 | 1229 |
} |
1230 |
||
1231 |
return new_obj; |
|
1232 |
} |
|
1233 |
||
1234 |
// Oops. Someone beat us to it. Undo the allocation. Where did we |
|
1235 |
// allocate it? |
|
1236 |
if (is_in_reserved(new_obj)) { |
|
1237 |
// Must be in to_space. |
|
1238 |
assert(to()->is_in_reserved(new_obj), "Checking"); |
|
1239 |
if (forward_ptr == ClaimedForwardPtr) { |
|
1240 |
// Wait to get the real forwarding pointer value. |
|
1241 |
forward_ptr = real_forwardee(old); |
|
1242 |
} |
|
1243 |
par_scan_state->undo_alloc_in_to_space((HeapWord*)new_obj, sz); |
|
1244 |
} |
|
1245 |
||
1246 |
return forward_ptr; |
|
1247 |
} |
|
1248 |
||
1910 | 1249 |
#ifndef PRODUCT |
1250 |
// It's OK to call this multi-threaded; the worst thing |
|
1251 |
// that can happen is that we'll get a bunch of closely |
|
22551 | 1252 |
// spaced simulated overflows, but that's OK, in fact |
1910 | 1253 |
// probably good as it would exercise the overflow code |
1254 |
// under contention. |
|
1255 |
bool ParNewGeneration::should_simulate_overflow() { |
|
1256 |
if (_overflow_counter-- <= 0) { // just being defensive |
|
1257 |
_overflow_counter = ParGCWorkQueueOverflowInterval; |
|
1258 |
return true; |
|
1259 |
} else { |
|
1260 |
return false; |
|
1261 |
} |
|
1262 |
} |
|
1263 |
#endif |
|
1264 |
||
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1265 |
// In case we are using compressed oops, we need to be careful. |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1266 |
// If the object being pushed is an object array, then its length |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1267 |
// field keeps track of the "grey boundary" at which the next |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1268 |
// incremental scan will be done (see ParGCArrayScanChunk). |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1269 |
// When using compressed oops, this length field is kept in the |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1270 |
// lower 32 bits of the erstwhile klass word and cannot be used |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1271 |
// for the overflow chaining pointer (OCP below). As such the OCP |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1272 |
// would itself need to be compressed into the top 32-bits in this |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1273 |
// case. Unfortunately, see below, in the event that we have a |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1274 |
// promotion failure, the node to be pushed on the list can be |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1275 |
// outside of the Java heap, so the heap-based pointer compression |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1276 |
// would not work (we would have potential aliasing between C-heap |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1277 |
// and Java-heap pointers). For this reason, when using compressed |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1278 |
// oops, we simply use a worker-thread-local, non-shared overflow |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1279 |
// list in the form of a growable array, with a slightly different |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1280 |
// overflow stack draining strategy. If/when we start using fat |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1281 |
// stacks here, we can go back to using (fat) pointer chains |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1282 |
// (although some performance comparisons would be useful since |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1283 |
// single global lists have their own performance disadvantages |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1284 |
// as we were made painfully aware not long ago, see 6786503). |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1285 |
#define BUSY (cast_to_oop<intptr_t>(0x1aff1aff)) |
1910 | 1286 |
void ParNewGeneration::push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state) { |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1287 |
assert(is_in_reserved(from_space_obj), "Should be from this generation"); |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
1288 |
if (ParGCUseLocalOverflow) { |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1289 |
// In the case of compressed oops, we use a private, not-shared |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1290 |
// overflow stack. |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1291 |
par_scan_state->push_on_overflow_stack(from_space_obj); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1292 |
} else { |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
1293 |
assert(!UseCompressedOops, "Error"); |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1294 |
// if the object has been forwarded to itself, then we cannot |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1295 |
// use the klass pointer for the linked list. Instead we have |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1296 |
// to allocate an oopDesc in the C-Heap and use that for the linked list. |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1297 |
// XXX This is horribly inefficient when a promotion failure occurs |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1298 |
// and should be fixed. XXX FIX ME !!! |
1910 | 1299 |
#ifndef PRODUCT |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1300 |
Atomic::inc_ptr(&_num_par_pushes); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1301 |
assert(_num_par_pushes > 0, "Tautology"); |
1910 | 1302 |
#endif |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1303 |
if (from_space_obj->forwardee() == from_space_obj) { |
13195 | 1304 |
oopDesc* listhead = NEW_C_HEAP_ARRAY(oopDesc, 1, mtGC); |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1305 |
listhead->forward_to(from_space_obj); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1306 |
from_space_obj = listhead; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1307 |
} |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1308 |
oop observed_overflow_list = _overflow_list; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1309 |
oop cur_overflow_list; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1310 |
do { |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1311 |
cur_overflow_list = observed_overflow_list; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1312 |
if (cur_overflow_list != BUSY) { |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1313 |
from_space_obj->set_klass_to_list_ptr(cur_overflow_list); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1314 |
} else { |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1315 |
from_space_obj->set_klass_to_list_ptr(NULL); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1316 |
} |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1317 |
observed_overflow_list = |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1318 |
(oop)Atomic::cmpxchg_ptr(from_space_obj, &_overflow_list, cur_overflow_list); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1319 |
} while (cur_overflow_list != observed_overflow_list); |
1 | 1320 |
} |
1321 |
} |
|
1322 |
||
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1323 |
bool ParNewGeneration::take_from_overflow_list(ParScanThreadState* par_scan_state) { |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1324 |
bool res; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1325 |
|
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
1326 |
if (ParGCUseLocalOverflow) { |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1327 |
res = par_scan_state->take_from_overflow_stack(); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1328 |
} else { |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
1329 |
assert(!UseCompressedOops, "Error"); |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1330 |
res = take_from_overflow_list_work(par_scan_state); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1331 |
} |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1332 |
return res; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1333 |
} |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1334 |
|
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1335 |
|
1910 | 1336 |
// *NOTE*: The overflow list manipulation code here and |
1337 |
// in CMSCollector:: are very similar in shape, |
|
1338 |
// except that in the CMS case we thread the objects |
|
1339 |
// directly into the list via their mark word, and do |
|
1340 |
// not need to deal with special cases below related |
|
1341 |
// to chunking of object arrays and promotion failure |
|
1342 |
// handling. |
|
1343 |
// CR 6797058 has been filed to attempt consolidation of |
|
1344 |
// the common code. |
|
1345 |
// Because of the common code, if you make any changes in |
|
1346 |
// the code below, please check the CMS version to see if |
|
1347 |
// similar changes might be needed. |
|
1348 |
// See CMSCollector::par_take_from_overflow_list() for |
|
1349 |
// more extensive documentation comments. |
|
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1350 |
bool ParNewGeneration::take_from_overflow_list_work(ParScanThreadState* par_scan_state) { |
1 | 1351 |
ObjToScanQueue* work_q = par_scan_state->work_queue(); |
1352 |
// How many to take? |
|
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1353 |
size_t objsFromOverflow = MIN2((size_t)(work_q->max_elems() - work_q->size())/4, |
1910 | 1354 |
(size_t)ParGCDesiredObjsFromOverflowList); |
1 | 1355 |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
6759
diff
changeset
|
1356 |
assert(!UseCompressedOops, "Error"); |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1357 |
assert(par_scan_state->overflow_stack() == NULL, "Error"); |
1 | 1358 |
if (_overflow_list == NULL) return false; |
1359 |
||
1360 |
// Otherwise, there was something there; try claiming the list. |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1361 |
oop prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
1910 | 1362 |
// Trim off a prefix of at most objsFromOverflow items |
1363 |
Thread* tid = Thread::current(); |
|
1364 |
size_t spin_count = (size_t)ParallelGCThreads; |
|
1365 |
size_t sleep_time_millis = MAX2((size_t)1, objsFromOverflow/100); |
|
1366 |
for (size_t spin = 0; prefix == BUSY && spin < spin_count; spin++) { |
|
1367 |
// someone grabbed it before we did ... |
|
1368 |
// ... we spin for a short while... |
|
1369 |
os::sleep(tid, sleep_time_millis, false); |
|
1370 |
if (_overflow_list == NULL) { |
|
1371 |
// nothing left to take |
|
1372 |
return false; |
|
1373 |
} else if (_overflow_list != BUSY) { |
|
1374 |
// try and grab the prefix |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1375 |
prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
1910 | 1376 |
} |
1 | 1377 |
} |
1910 | 1378 |
if (prefix == NULL || prefix == BUSY) { |
1379 |
// Nothing to take or waited long enough |
|
1380 |
if (prefix == NULL) { |
|
1381 |
// Write back the NULL in case we overwrote it with BUSY above |
|
1382 |
// and it is still the same value. |
|
1383 |
(void) Atomic::cmpxchg_ptr(NULL, &_overflow_list, BUSY); |
|
1384 |
} |
|
1385 |
return false; |
|
1386 |
} |
|
1387 |
assert(prefix != NULL && prefix != BUSY, "Error"); |
|
1388 |
size_t i = 1; |
|
1 | 1389 |
oop cur = prefix; |
593
803947e176bd
6696264: assert("narrow oop can never be zero") for GCBasher & ParNewGC
coleenp
parents:
360
diff
changeset
|
1390 |
while (i < objsFromOverflow && cur->klass_or_null() != NULL) { |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1391 |
i++; cur = cur->list_ptr_from_klass(); |
1 | 1392 |
} |
1393 |
||
1394 |
// Reattach remaining (suffix) to overflow list |
|
1910 | 1395 |
if (cur->klass_or_null() == NULL) { |
1396 |
// Write back the NULL in lieu of the BUSY we wrote |
|
1397 |
// above and it is still the same value. |
|
1398 |
if (_overflow_list == BUSY) { |
|
1399 |
(void) Atomic::cmpxchg_ptr(NULL, &_overflow_list, BUSY); |
|
1 | 1400 |
} |
1910 | 1401 |
} else { |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1402 |
assert(cur->klass_or_null() != (Klass*)(address)BUSY, "Error"); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1403 |
oop suffix = cur->list_ptr_from_klass(); // suffix will be put back on global list |
1910 | 1404 |
cur->set_klass_to_list_ptr(NULL); // break off suffix |
1405 |
// It's possible that the list is still in the empty(busy) state |
|
1406 |
// we left it in a short while ago; in that case we may be |
|
1407 |
// able to place back the suffix. |
|
1408 |
oop observed_overflow_list = _overflow_list; |
|
1409 |
oop cur_overflow_list = observed_overflow_list; |
|
1410 |
bool attached = false; |
|
1411 |
while (observed_overflow_list == BUSY || observed_overflow_list == NULL) { |
|
1412 |
observed_overflow_list = |
|
1413 |
(oop) Atomic::cmpxchg_ptr(suffix, &_overflow_list, cur_overflow_list); |
|
1414 |
if (cur_overflow_list == observed_overflow_list) { |
|
1415 |
attached = true; |
|
1416 |
break; |
|
1417 |
} else cur_overflow_list = observed_overflow_list; |
|
1418 |
} |
|
1419 |
if (!attached) { |
|
1420 |
// Too bad, someone else got in in between; we'll need to do a splice. |
|
1421 |
// Find the last item of suffix list |
|
1422 |
oop last = suffix; |
|
1423 |
while (last->klass_or_null() != NULL) { |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1424 |
last = last->list_ptr_from_klass(); |
1910 | 1425 |
} |
1426 |
// Atomically prepend suffix to current overflow list |
|
1427 |
observed_overflow_list = _overflow_list; |
|
1428 |
do { |
|
1429 |
cur_overflow_list = observed_overflow_list; |
|
1430 |
if (cur_overflow_list != BUSY) { |
|
1431 |
// Do the splice ... |
|
1432 |
last->set_klass_to_list_ptr(cur_overflow_list); |
|
1433 |
} else { // cur_overflow_list == BUSY |
|
1434 |
last->set_klass_to_list_ptr(NULL); |
|
1435 |
} |
|
1436 |
observed_overflow_list = |
|
1437 |
(oop)Atomic::cmpxchg_ptr(suffix, &_overflow_list, cur_overflow_list); |
|
1438 |
} while (cur_overflow_list != observed_overflow_list); |
|
1 | 1439 |
} |
1440 |
} |
|
1441 |
||
1442 |
// Push objects on prefix list onto this thread's work queue |
|
1910 | 1443 |
assert(prefix != NULL && prefix != BUSY, "program logic"); |
1 | 1444 |
cur = prefix; |
1910 | 1445 |
ssize_t n = 0; |
1 | 1446 |
while (cur != NULL) { |
1447 |
oop obj_to_push = cur->forwardee(); |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1448 |
oop next = cur->list_ptr_from_klass(); |
1 | 1449 |
cur->set_klass(obj_to_push->klass()); |
1910 | 1450 |
// This may be an array object that is self-forwarded. In that case, the list pointer |
1451 |
// space, cur, is not in the Java heap, but rather in the C-heap and should be freed. |
|
1452 |
if (!is_in_reserved(cur)) { |
|
1453 |
// This can become a scaling bottleneck when there is work queue overflow coincident |
|
1454 |
// with promotion failure. |
|
1455 |
oopDesc* f = cur; |
|
27880
afb974a04396
8060074: os::free() takes MemoryTrackingLevel but doesn't need it
coleenp
parents:
27251
diff
changeset
|
1456 |
FREE_C_HEAP_ARRAY(oopDesc, f); |
1910 | 1457 |
} else if (par_scan_state->should_be_partially_scanned(obj_to_push, cur)) { |
1 | 1458 |
assert(arrayOop(cur)->length() == 0, "entire array remaining to be scanned"); |
1910 | 1459 |
obj_to_push = cur; |
1 | 1460 |
} |
1910 | 1461 |
bool ok = work_q->push(obj_to_push); |
1462 |
assert(ok, "Should have succeeded"); |
|
1 | 1463 |
cur = next; |
1464 |
n++; |
|
1465 |
} |
|
6252 | 1466 |
TASKQUEUE_STATS_ONLY(par_scan_state->note_overflow_refill(n)); |
1910 | 1467 |
#ifndef PRODUCT |
1468 |
assert(_num_par_pushes >= n, "Too many pops?"); |
|
1469 |
Atomic::add_ptr(-(intptr_t)n, &_num_par_pushes); |
|
1470 |
#endif |
|
1 | 1471 |
return true; |
1472 |
} |
|
1910 | 1473 |
#undef BUSY |
1 | 1474 |
|
18025 | 1475 |
void ParNewGeneration::ref_processor_init() { |
1 | 1476 |
if (_ref_processor == NULL) { |
1477 |
// Allocate and initialize a reference processor |
|
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1478 |
_ref_processor = |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1479 |
new ReferenceProcessor(_reserved, // span |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1480 |
ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1481 |
(int) ParallelGCThreads, // mt processing degree |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1482 |
refs_discovery_is_mt(), // mt discovery |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1483 |
(int) ParallelGCThreads, // mt discovery degree |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1484 |
refs_discovery_is_atomic(), // atomic_discovery |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
1485 |
NULL); // is_alive_non_header |
1 | 1486 |
} |
1487 |
} |
|
1488 |
||
1489 |
const char* ParNewGeneration::name() const { |
|
1490 |
return "par new generation"; |
|
1491 |
} |