author | drchase |
Fri, 09 May 2014 16:50:54 -0400 | |
changeset 24424 | 2658d7834c6e |
parent 24351 | 61b33cc6d3cf |
child 24845 | e8b8894a77df |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 2014, 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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#include "precompiled.hpp" |
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#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp" |
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#include "gc_implementation/parNew/parNewGeneration.hpp" |
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#include "gc_implementation/parNew/parOopClosures.inline.hpp" |
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#include "gc_implementation/shared/adaptiveSizePolicy.hpp" |
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#include "gc_implementation/shared/ageTable.hpp" |
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#include "gc_implementation/shared/parGCAllocBuffer.hpp" |
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#include "gc_implementation/shared/gcHeapSummary.hpp" |
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#include "gc_implementation/shared/gcTimer.hpp" |
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#include "gc_implementation/shared/gcTrace.hpp" |
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#include "gc_implementation/shared/gcTraceTime.hpp" |
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#include "gc_implementation/shared/copyFailedInfo.hpp" |
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#include "gc_implementation/shared/spaceDecorator.hpp" |
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#include "memory/defNewGeneration.inline.hpp" |
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#include "memory/genCollectedHeap.hpp" |
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#include "memory/genOopClosures.inline.hpp" |
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#include "memory/generation.hpp" |
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#include "memory/generation.inline.hpp" |
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#include "memory/referencePolicy.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "memory/sharedHeap.hpp" |
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#include "memory/space.hpp" |
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#include "oops/objArrayOop.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "oops/oop.pcgc.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/workgroup.hpp" |
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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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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(Universe::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(Universe::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(Universe::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) { |
|
230 |
ParGCAllocBuffer* const plab = to_space_alloc_buffer(); |
|
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. |
|
235 |
plab->retire(false, false); |
|
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 = |
|
240 |
ParGCAllocBuffer::min_size() << LogHeapWordSize; |
|
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); |
|
254 |
obj = plab->allocate(word_sz); |
|
255 |
// Note that we cannot compare buf_size < word_sz below |
|
256 |
// because of AlignmentReserve (see ParGCAllocBuffer::allocate()). |
|
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 |
||
276 |
void ParScanThreadState::undo_alloc_in_to_space(HeapWord* obj, |
|
277 |
size_t word_sz) { |
|
278 |
// Is the alloc in the current alloc buffer? |
|
279 |
if (to_space_alloc_buffer()->contains(obj)) { |
|
280 |
assert(to_space_alloc_buffer()->contains(obj + word_sz - 1), |
|
281 |
"Should contain whole object."); |
|
282 |
to_space_alloc_buffer()->undo_allocation(obj, word_sz); |
|
283 |
} else { |
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CollectedHeap::fill_with_object(obj, word_sz); |
1 | 285 |
} |
286 |
} |
|
287 |
||
18025 | 288 |
void ParScanThreadState::print_promotion_failure_size() { |
289 |
if (_promotion_failed_info.has_failed() && PrintPromotionFailure) { |
|
290 |
gclog_or_tty->print(" (%d: promotion failure size = " SIZE_FORMAT ") ", |
|
291 |
_thread_num, _promotion_failed_info.first_size()); |
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} |
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293 |
} |
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294 |
|
1 | 295 |
class ParScanThreadStateSet: private ResourceArray { |
296 |
public: |
|
297 |
// Initializes states for the specified number of threads; |
|
298 |
ParScanThreadStateSet(int num_threads, |
|
299 |
Space& to_space, |
|
300 |
ParNewGeneration& gen, |
|
301 |
Generation& old_gen, |
|
302 |
ObjToScanQueueSet& queue_set, |
|
13195 | 303 |
Stack<oop, mtGC>* overflow_stacks_, |
1 | 304 |
size_t desired_plab_sz, |
305 |
ParallelTaskTerminator& term); |
|
6252 | 306 |
|
307 |
~ParScanThreadStateSet() { TASKQUEUE_STATS_ONLY(reset_stats()); } |
|
308 |
||
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inline ParScanThreadState& thread_state(int i); |
6252 | 310 |
|
18025 | 311 |
void trace_promotion_failed(YoungGCTracer& gc_tracer); |
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void reset(int active_workers, bool promotion_failed); |
1 | 313 |
void flush(); |
6252 | 314 |
|
315 |
#if TASKQUEUE_STATS |
|
316 |
static void |
|
317 |
print_termination_stats_hdr(outputStream* const st = gclog_or_tty); |
|
318 |
void print_termination_stats(outputStream* const st = gclog_or_tty); |
|
319 |
static void |
|
320 |
print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); |
|
321 |
void print_taskqueue_stats(outputStream* const st = gclog_or_tty); |
|
322 |
void reset_stats(); |
|
323 |
#endif // TASKQUEUE_STATS |
|
324 |
||
1 | 325 |
private: |
326 |
ParallelTaskTerminator& _term; |
|
327 |
ParNewGeneration& _gen; |
|
328 |
Generation& _next_gen; |
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public: |
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bool is_valid(int id) const { return id < length(); } |
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331 |
ParallelTaskTerminator* terminator() { return &_term; } |
1 | 332 |
}; |
333 |
||
334 |
||
335 |
ParScanThreadStateSet::ParScanThreadStateSet( |
|
336 |
int num_threads, Space& to_space, ParNewGeneration& gen, |
|
337 |
Generation& old_gen, ObjToScanQueueSet& queue_set, |
|
13195 | 338 |
Stack<oop, mtGC>* overflow_stacks, |
1 | 339 |
size_t desired_plab_sz, ParallelTaskTerminator& term) |
340 |
: ResourceArray(sizeof(ParScanThreadState), num_threads), |
|
6252 | 341 |
_gen(gen), _next_gen(old_gen), _term(term) |
1 | 342 |
{ |
343 |
assert(num_threads > 0, "sanity check!"); |
|
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assert(ParGCUseLocalOverflow == (overflow_stacks != NULL), |
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345 |
"overflow_stack allocation mismatch"); |
1 | 346 |
// Initialize states. |
347 |
for (int i = 0; i < num_threads; ++i) { |
|
348 |
new ((ParScanThreadState*)_data + i) |
|
349 |
ParScanThreadState(&to_space, &gen, &old_gen, i, &queue_set, |
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overflow_stacks, desired_plab_sz, term); |
1 | 351 |
} |
352 |
} |
|
353 |
||
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354 |
inline ParScanThreadState& ParScanThreadStateSet::thread_state(int i) |
1 | 355 |
{ |
356 |
assert(i >= 0 && i < length(), "sanity check!"); |
|
357 |
return ((ParScanThreadState*)_data)[i]; |
|
358 |
} |
|
359 |
||
18025 | 360 |
void ParScanThreadStateSet::trace_promotion_failed(YoungGCTracer& gc_tracer) { |
361 |
for (int i = 0; i < length(); ++i) { |
|
362 |
if (thread_state(i).promotion_failed()) { |
|
363 |
gc_tracer.report_promotion_failed(thread_state(i).promotion_failed_info()); |
|
364 |
thread_state(i).promotion_failed_info().reset(); |
|
365 |
} |
|
366 |
} |
|
367 |
} |
|
1 | 368 |
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369 |
void ParScanThreadStateSet::reset(int active_threads, bool promotion_failed) |
1 | 370 |
{ |
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371 |
_term.reset_for_reuse(active_threads); |
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372 |
if (promotion_failed) { |
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373 |
for (int i = 0; i < length(); ++i) { |
18025 | 374 |
thread_state(i).print_promotion_failure_size(); |
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375 |
} |
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376 |
} |
1 | 377 |
} |
378 |
||
6252 | 379 |
#if TASKQUEUE_STATS |
380 |
void |
|
381 |
ParScanThreadState::reset_stats() |
|
382 |
{ |
|
383 |
taskqueue_stats().reset(); |
|
384 |
_term_attempts = 0; |
|
385 |
_overflow_refills = 0; |
|
386 |
_overflow_refill_objs = 0; |
|
387 |
} |
|
388 |
||
389 |
void ParScanThreadStateSet::reset_stats() |
|
390 |
{ |
|
391 |
for (int i = 0; i < length(); ++i) { |
|
392 |
thread_state(i).reset_stats(); |
|
393 |
} |
|
394 |
} |
|
395 |
||
396 |
void |
|
397 |
ParScanThreadStateSet::print_termination_stats_hdr(outputStream* const st) |
|
398 |
{ |
|
399 |
st->print_raw_cr("GC Termination Stats"); |
|
400 |
st->print_raw_cr(" elapsed --strong roots-- " |
|
401 |
"-------termination-------"); |
|
402 |
st->print_raw_cr("thr ms ms % " |
|
403 |
" ms % attempts"); |
|
404 |
st->print_raw_cr("--- --------- --------- ------ " |
|
405 |
"--------- ------ --------"); |
|
406 |
} |
|
407 |
||
408 |
void ParScanThreadStateSet::print_termination_stats(outputStream* const st) |
|
409 |
{ |
|
410 |
print_termination_stats_hdr(st); |
|
411 |
||
412 |
for (int i = 0; i < length(); ++i) { |
|
413 |
const ParScanThreadState & pss = thread_state(i); |
|
414 |
const double elapsed_ms = pss.elapsed_time() * 1000.0; |
|
415 |
const double s_roots_ms = pss.strong_roots_time() * 1000.0; |
|
416 |
const double term_ms = pss.term_time() * 1000.0; |
|
417 |
st->print_cr("%3d %9.2f %9.2f %6.2f " |
|
418 |
"%9.2f %6.2f " SIZE_FORMAT_W(8), |
|
419 |
i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, |
|
420 |
term_ms, term_ms * 100 / elapsed_ms, pss.term_attempts()); |
|
421 |
} |
|
422 |
} |
|
423 |
||
424 |
// Print stats related to work queue activity. |
|
425 |
void ParScanThreadStateSet::print_taskqueue_stats_hdr(outputStream* const st) |
|
426 |
{ |
|
427 |
st->print_raw_cr("GC Task Stats"); |
|
428 |
st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); |
|
429 |
st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); |
|
430 |
} |
|
431 |
||
432 |
void ParScanThreadStateSet::print_taskqueue_stats(outputStream* const st) |
|
433 |
{ |
|
434 |
print_taskqueue_stats_hdr(st); |
|
435 |
||
436 |
TaskQueueStats totals; |
|
437 |
for (int i = 0; i < length(); ++i) { |
|
438 |
const ParScanThreadState & pss = thread_state(i); |
|
439 |
const TaskQueueStats & stats = pss.taskqueue_stats(); |
|
440 |
st->print("%3d ", i); stats.print(st); st->cr(); |
|
441 |
totals += stats; |
|
442 |
||
443 |
if (pss.overflow_refills() > 0) { |
|
444 |
st->print_cr(" " SIZE_FORMAT_W(10) " overflow refills " |
|
445 |
SIZE_FORMAT_W(10) " overflow objects", |
|
446 |
pss.overflow_refills(), pss.overflow_refill_objs()); |
|
447 |
} |
|
448 |
} |
|
449 |
st->print("tot "); totals.print(st); st->cr(); |
|
450 |
||
451 |
DEBUG_ONLY(totals.verify()); |
|
452 |
} |
|
453 |
#endif // TASKQUEUE_STATS |
|
454 |
||
1 | 455 |
void ParScanThreadStateSet::flush() |
456 |
{ |
|
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457 |
// Work in this loop should be kept as lightweight as |
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|
458 |
// possible since this might otherwise become a bottleneck |
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|
459 |
// to scaling. Should we add heavy-weight work into this |
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|
460 |
// loop, consider parallelizing the loop into the worker threads. |
1 | 461 |
for (int i = 0; i < length(); ++i) { |
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|
462 |
ParScanThreadState& par_scan_state = thread_state(i); |
1 | 463 |
|
464 |
// Flush stats related to To-space PLAB activity and |
|
465 |
// retire the last buffer. |
|
466 |
par_scan_state.to_space_alloc_buffer()-> |
|
467 |
flush_stats_and_retire(_gen.plab_stats(), |
|
13466 | 468 |
true /* end_of_gc */, |
469 |
false /* retain */); |
|
1 | 470 |
|
471 |
// Every thread has its own age table. We need to merge |
|
472 |
// them all into one. |
|
473 |
ageTable *local_table = par_scan_state.age_table(); |
|
474 |
_gen.age_table()->merge(local_table); |
|
475 |
||
476 |
// Inform old gen that we're done. |
|
477 |
_next_gen.par_promote_alloc_done(i); |
|
478 |
_next_gen.par_oop_since_save_marks_iterate_done(i); |
|
6252 | 479 |
} |
1 | 480 |
|
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481 |
if (UseConcMarkSweepGC && ParallelGCThreads > 0) { |
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482 |
// We need to call this even when ResizeOldPLAB is disabled |
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483 |
// so as to avoid breaking some asserts. While we may be able |
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484 |
// to avoid this by reorganizing the code a bit, I am loathe |
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|
485 |
// to do that unless we find cases where ergo leads to bad |
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|
486 |
// performance. |
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|
487 |
CFLS_LAB::compute_desired_plab_size(); |
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|
488 |
} |
1 | 489 |
} |
490 |
||
491 |
ParScanClosure::ParScanClosure(ParNewGeneration* g, |
|
492 |
ParScanThreadState* par_scan_state) : |
|
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493 |
OopsInKlassOrGenClosure(g), _par_scan_state(par_scan_state), _g(g) |
1 | 494 |
{ |
495 |
assert(_g->level() == 0, "Optimized for youngest generation"); |
|
496 |
_boundary = _g->reserved().end(); |
|
497 |
} |
|
498 |
||
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499 |
void ParScanWithBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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500 |
void ParScanWithBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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501 |
|
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|
502 |
void ParScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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503 |
void ParScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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504 |
|
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|
505 |
void ParRootScanWithBarrierTwoGensClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, true); } |
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506 |
void ParRootScanWithBarrierTwoGensClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, true); } |
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|
507 |
|
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|
508 |
void ParRootScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, true); } |
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|
509 |
void ParRootScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, true); } |
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510 |
|
1 | 511 |
ParScanWeakRefClosure::ParScanWeakRefClosure(ParNewGeneration* g, |
512 |
ParScanThreadState* par_scan_state) |
|
513 |
: ScanWeakRefClosure(g), _par_scan_state(par_scan_state) |
|
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|
514 |
{} |
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changeset
|
515 |
|
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|
516 |
void ParScanWeakRefClosure::do_oop(oop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
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|
517 |
void ParScanWeakRefClosure::do_oop(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
1 | 518 |
|
519 |
#ifdef WIN32 |
|
520 |
#pragma warning(disable: 4786) /* identifier was truncated to '255' characters in the browser information */ |
|
521 |
#endif |
|
522 |
||
523 |
ParEvacuateFollowersClosure::ParEvacuateFollowersClosure( |
|
524 |
ParScanThreadState* par_scan_state_, |
|
525 |
ParScanWithoutBarrierClosure* to_space_closure_, |
|
526 |
ParScanWithBarrierClosure* old_gen_closure_, |
|
527 |
ParRootScanWithoutBarrierClosure* to_space_root_closure_, |
|
528 |
ParNewGeneration* par_gen_, |
|
529 |
ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure_, |
|
530 |
ObjToScanQueueSet* task_queues_, |
|
531 |
ParallelTaskTerminator* terminator_) : |
|
532 |
||
533 |
_par_scan_state(par_scan_state_), |
|
534 |
_to_space_closure(to_space_closure_), |
|
535 |
_old_gen_closure(old_gen_closure_), |
|
536 |
_to_space_root_closure(to_space_root_closure_), |
|
537 |
_old_gen_root_closure(old_gen_root_closure_), |
|
538 |
_par_gen(par_gen_), |
|
539 |
_task_queues(task_queues_), |
|
540 |
_terminator(terminator_) |
|
541 |
{} |
|
542 |
||
543 |
void ParEvacuateFollowersClosure::do_void() { |
|
544 |
ObjToScanQueue* work_q = par_scan_state()->work_queue(); |
|
545 |
||
546 |
while (true) { |
|
547 |
||
548 |
// Scan to-space and old-gen objs until we run out of both. |
|
549 |
oop obj_to_scan; |
|
550 |
par_scan_state()->trim_queues(0); |
|
551 |
||
552 |
// We have no local work, attempt to steal from other threads. |
|
553 |
||
554 |
// attempt to steal work from promoted. |
|
555 |
if (task_queues()->steal(par_scan_state()->thread_num(), |
|
556 |
par_scan_state()->hash_seed(), |
|
557 |
obj_to_scan)) { |
|
558 |
bool res = work_q->push(obj_to_scan); |
|
559 |
assert(res, "Empty queue should have room for a push."); |
|
560 |
||
561 |
// if successful, goto Start. |
|
562 |
continue; |
|
563 |
||
564 |
// try global overflow list. |
|
565 |
} else if (par_gen()->take_from_overflow_list(par_scan_state())) { |
|
566 |
continue; |
|
567 |
} |
|
568 |
||
569 |
// Otherwise, offer termination. |
|
570 |
par_scan_state()->start_term_time(); |
|
571 |
if (terminator()->offer_termination()) break; |
|
572 |
par_scan_state()->end_term_time(); |
|
573 |
} |
|
1910 | 574 |
assert(par_gen()->_overflow_list == NULL && par_gen()->_num_par_pushes == 0, |
575 |
"Broken overflow list?"); |
|
1 | 576 |
// Finish the last termination pause. |
577 |
par_scan_state()->end_term_time(); |
|
578 |
} |
|
579 |
||
580 |
ParNewGenTask::ParNewGenTask(ParNewGeneration* gen, Generation* next_gen, |
|
581 |
HeapWord* young_old_boundary, ParScanThreadStateSet* state_set) : |
|
582 |
AbstractGangTask("ParNewGeneration collection"), |
|
583 |
_gen(gen), _next_gen(next_gen), |
|
584 |
_young_old_boundary(young_old_boundary), |
|
585 |
_state_set(state_set) |
|
586 |
{} |
|
587 |
||
11174
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changeset
|
588 |
// Reset the terminator for the given number of |
fccee5238e70
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parents:
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diff
changeset
|
589 |
// active threads. |
fccee5238e70
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parents:
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diff
changeset
|
590 |
void ParNewGenTask::set_for_termination(int active_workers) { |
fccee5238e70
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parents:
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diff
changeset
|
591 |
_state_set->reset(active_workers, _gen->promotion_failed()); |
fccee5238e70
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parents:
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diff
changeset
|
592 |
// Should the heap be passed in? There's only 1 for now so |
fccee5238e70
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parents:
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diff
changeset
|
593 |
// grab it instead. |
fccee5238e70
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jmasa
parents:
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diff
changeset
|
594 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
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diff
changeset
|
595 |
gch->set_n_termination(active_workers); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
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diff
changeset
|
596 |
} |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
597 |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11174
diff
changeset
|
598 |
void ParNewGenTask::work(uint worker_id) { |
1 | 599 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
600 |
// Since this is being done in a separate thread, need new resource |
|
601 |
// and handle marks. |
|
602 |
ResourceMark rm; |
|
603 |
HandleMark hm; |
|
604 |
// We would need multiple old-gen queues otherwise. |
|
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
605 |
assert(gch->n_gens() == 2, "Par young collection currently only works with one older gen."); |
1 | 606 |
|
607 |
Generation* old_gen = gch->next_gen(_gen); |
|
608 |
||
11396
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parents:
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diff
changeset
|
609 |
ParScanThreadState& par_scan_state = _state_set->thread_state(worker_id); |
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
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changeset
|
610 |
assert(_state_set->is_valid(worker_id), "Should not have been called"); |
11174
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diff
changeset
|
611 |
|
1 | 612 |
par_scan_state.set_young_old_boundary(_young_old_boundary); |
613 |
||
13728
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parents:
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diff
changeset
|
614 |
KlassScanClosure klass_scan_closure(&par_scan_state.to_space_root_closure(), |
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parents:
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diff
changeset
|
615 |
gch->rem_set()->klass_rem_set()); |
882756847a04
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coleenp
parents:
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diff
changeset
|
616 |
|
22550
820966182ab9
8032379: Remove the is_scavenging flag to process_strong_roots
mgerdin
parents:
21767
diff
changeset
|
617 |
int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_ScavengeCodeCache; |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
618 |
|
1 | 619 |
par_scan_state.start_strong_roots(); |
620 |
gch->gen_process_strong_roots(_gen->level(), |
|
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2362
diff
changeset
|
621 |
true, // Process younger gens, if any, |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2362
diff
changeset
|
622 |
// as strong roots. |
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2362
diff
changeset
|
623 |
false, // no scope; this is parallel code |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
624 |
SharedHeap::ScanningOption(so), |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2362
diff
changeset
|
625 |
&par_scan_state.to_space_root_closure(), |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
626 |
&par_scan_state.older_gen_closure(), |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
627 |
&klass_scan_closure); |
1 | 628 |
par_scan_state.end_strong_roots(); |
629 |
||
630 |
// "evacuate followers". |
|
631 |
par_scan_state.evacuate_followers_closure().do_void(); |
|
632 |
} |
|
633 |
||
634 |
#ifdef _MSC_VER |
|
635 |
#pragma warning( push ) |
|
636 |
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
|
637 |
#endif |
|
638 |
ParNewGeneration:: |
|
639 |
ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level) |
|
640 |
: DefNewGeneration(rs, initial_byte_size, level, "PCopy"), |
|
641 |
_overflow_list(NULL), |
|
642 |
_is_alive_closure(this), |
|
643 |
_plab_stats(YoungPLABSize, PLABWeight) |
|
644 |
{ |
|
1910 | 645 |
NOT_PRODUCT(_overflow_counter = ParGCWorkQueueOverflowInterval;) |
646 |
NOT_PRODUCT(_num_par_pushes = 0;) |
|
1 | 647 |
_task_queues = new ObjToScanQueueSet(ParallelGCThreads); |
648 |
guarantee(_task_queues != NULL, "task_queues allocation failure."); |
|
649 |
||
650 |
for (uint i1 = 0; i1 < ParallelGCThreads; i1++) { |
|
6067 | 651 |
ObjToScanQueue *q = new ObjToScanQueue(); |
652 |
guarantee(q != NULL, "work_queue Allocation failure."); |
|
653 |
_task_queues->register_queue(i1, q); |
|
1 | 654 |
} |
655 |
||
656 |
for (uint i2 = 0; i2 < ParallelGCThreads; i2++) |
|
657 |
_task_queues->queue(i2)->initialize(); |
|
658 |
||
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
6759
diff
changeset
|
659 |
_overflow_stacks = NULL; |
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
6759
diff
changeset
|
660 |
if (ParGCUseLocalOverflow) { |
13195 | 661 |
|
662 |
// typedef to workaround NEW_C_HEAP_ARRAY macro, which can not deal |
|
663 |
// with ',' |
|
664 |
typedef Stack<oop, mtGC> GCOopStack; |
|
665 |
||
666 |
_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
|
667 |
for (size_t i = 0; i < ParallelGCThreads; ++i) { |
13195 | 668 |
new (_overflow_stacks + i) Stack<oop, mtGC>(); |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
669 |
} |
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
670 |
} |
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
671 |
|
1 | 672 |
if (UsePerfData) { |
673 |
EXCEPTION_MARK; |
|
674 |
ResourceMark rm; |
|
675 |
||
676 |
const char* cname = |
|
677 |
PerfDataManager::counter_name(_gen_counters->name_space(), "threads"); |
|
678 |
PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, |
|
679 |
ParallelGCThreads, CHECK); |
|
680 |
} |
|
681 |
} |
|
682 |
#ifdef _MSC_VER |
|
683 |
#pragma warning( pop ) |
|
684 |
#endif |
|
685 |
||
686 |
// ParNewGeneration:: |
|
687 |
ParKeepAliveClosure::ParKeepAliveClosure(ParScanWeakRefClosure* cl) : |
|
688 |
DefNewGeneration::KeepAliveClosure(cl), _par_cl(cl) {} |
|
689 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
690 |
template <class T> |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
691 |
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop_work(T* p) { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
692 |
#ifdef ASSERT |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
693 |
{ |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
694 |
assert(!oopDesc::is_null(*p), "expected non-null ref"); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
695 |
oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
696 |
// We never expect to see a null reference being processed |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
697 |
// as a weak reference. |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
698 |
assert(obj->is_oop(), "expected an oop while scanning weak refs"); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
699 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
700 |
#endif // ASSERT |
1 | 701 |
|
702 |
_par_cl->do_oop_nv(p); |
|
703 |
||
704 |
if (Universe::heap()->is_in_reserved(p)) { |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
705 |
oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
706 |
_rs->write_ref_field_gc_par(p, obj); |
1 | 707 |
} |
708 |
} |
|
709 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
710 |
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(oop* p) { ParKeepAliveClosure::do_oop_work(p); } |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
711 |
void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(narrowOop* p) { ParKeepAliveClosure::do_oop_work(p); } |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
712 |
|
1 | 713 |
// ParNewGeneration:: |
714 |
KeepAliveClosure::KeepAliveClosure(ScanWeakRefClosure* cl) : |
|
715 |
DefNewGeneration::KeepAliveClosure(cl) {} |
|
716 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
717 |
template <class T> |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
718 |
void /*ParNewGeneration::*/KeepAliveClosure::do_oop_work(T* p) { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
719 |
#ifdef ASSERT |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
720 |
{ |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
721 |
assert(!oopDesc::is_null(*p), "expected non-null ref"); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
722 |
oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
723 |
// We never expect to see a null reference being processed |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
724 |
// as a weak reference. |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
725 |
assert(obj->is_oop(), "expected an oop while scanning weak refs"); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
726 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
727 |
#endif // ASSERT |
1 | 728 |
|
729 |
_cl->do_oop_nv(p); |
|
730 |
||
731 |
if (Universe::heap()->is_in_reserved(p)) { |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
732 |
oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
733 |
_rs->write_ref_field_gc_par(p, obj); |
1 | 734 |
} |
735 |
} |
|
736 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
737 |
void /*ParNewGeneration::*/KeepAliveClosure::do_oop(oop* p) { KeepAliveClosure::do_oop_work(p); } |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
738 |
void /*ParNewGeneration::*/KeepAliveClosure::do_oop(narrowOop* p) { KeepAliveClosure::do_oop_work(p); } |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
739 |
|
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
740 |
template <class T> void ScanClosureWithParBarrier::do_oop_work(T* p) { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
179
diff
changeset
|
741 |
T heap_oop = oopDesc::load_heap_oop(p); |
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|
742 |
if (!oopDesc::is_null(heap_oop)) { |
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|
743 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
1 | 744 |
if ((HeapWord*)obj < _boundary) { |
745 |
assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); |
|
360
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|
746 |
oop new_obj = obj->is_forwarded() |
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changeset
|
747 |
? obj->forwardee() |
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|
748 |
: _g->DefNewGeneration::copy_to_survivor_space(obj); |
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changeset
|
749 |
oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
1 | 750 |
} |
751 |
if (_gc_barrier) { |
|
752 |
// If p points to a younger generation, mark the card. |
|
753 |
if ((HeapWord*)obj < _gen_boundary) { |
|
754 |
_rs->write_ref_field_gc_par(p, obj); |
|
755 |
} |
|
756 |
} |
|
757 |
} |
|
758 |
} |
|
759 |
||
360
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|
760 |
void ScanClosureWithParBarrier::do_oop(oop* p) { ScanClosureWithParBarrier::do_oop_work(p); } |
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|
761 |
void ScanClosureWithParBarrier::do_oop(narrowOop* p) { ScanClosureWithParBarrier::do_oop_work(p); } |
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|
762 |
|
1 | 763 |
class ParNewRefProcTaskProxy: public AbstractGangTask { |
764 |
typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
765 |
public: |
|
766 |
ParNewRefProcTaskProxy(ProcessTask& task, ParNewGeneration& gen, |
|
767 |
Generation& next_gen, |
|
768 |
HeapWord* young_old_boundary, |
|
769 |
ParScanThreadStateSet& state_set); |
|
770 |
||
771 |
private: |
|
11396
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diff
changeset
|
772 |
virtual void work(uint worker_id); |
11174
fccee5238e70
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parents:
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diff
changeset
|
773 |
virtual void set_for_termination(int active_workers) { |
fccee5238e70
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parents:
8688
diff
changeset
|
774 |
_state_set.terminator()->reset_for_reuse(active_workers); |
fccee5238e70
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changeset
|
775 |
} |
1 | 776 |
private: |
777 |
ParNewGeneration& _gen; |
|
778 |
ProcessTask& _task; |
|
779 |
Generation& _next_gen; |
|
780 |
HeapWord* _young_old_boundary; |
|
781 |
ParScanThreadStateSet& _state_set; |
|
782 |
}; |
|
783 |
||
784 |
ParNewRefProcTaskProxy::ParNewRefProcTaskProxy( |
|
785 |
ProcessTask& task, ParNewGeneration& gen, |
|
786 |
Generation& next_gen, |
|
787 |
HeapWord* young_old_boundary, |
|
788 |
ParScanThreadStateSet& state_set) |
|
789 |
: AbstractGangTask("ParNewGeneration parallel reference processing"), |
|
790 |
_gen(gen), |
|
791 |
_task(task), |
|
792 |
_next_gen(next_gen), |
|
793 |
_young_old_boundary(young_old_boundary), |
|
794 |
_state_set(state_set) |
|
795 |
{ |
|
796 |
} |
|
797 |
||
11396
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parents:
11174
diff
changeset
|
798 |
void ParNewRefProcTaskProxy::work(uint worker_id) |
1 | 799 |
{ |
800 |
ResourceMark rm; |
|
801 |
HandleMark hm; |
|
11396
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parents:
11174
diff
changeset
|
802 |
ParScanThreadState& par_scan_state = _state_set.thread_state(worker_id); |
1 | 803 |
par_scan_state.set_young_old_boundary(_young_old_boundary); |
11396
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jmasa
parents:
11174
diff
changeset
|
804 |
_task.work(worker_id, par_scan_state.is_alive_closure(), |
1 | 805 |
par_scan_state.keep_alive_closure(), |
806 |
par_scan_state.evacuate_followers_closure()); |
|
807 |
} |
|
808 |
||
809 |
class ParNewRefEnqueueTaskProxy: public AbstractGangTask { |
|
810 |
typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
811 |
EnqueueTask& _task; |
|
812 |
||
813 |
public: |
|
814 |
ParNewRefEnqueueTaskProxy(EnqueueTask& task) |
|
815 |
: AbstractGangTask("ParNewGeneration parallel reference enqueue"), |
|
816 |
_task(task) |
|
817 |
{ } |
|
818 |
||
11396
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parents:
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diff
changeset
|
819 |
virtual void work(uint worker_id) |
1 | 820 |
{ |
11396
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diff
changeset
|
821 |
_task.work(worker_id); |
1 | 822 |
} |
823 |
}; |
|
824 |
||
825 |
||
826 |
void ParNewRefProcTaskExecutor::execute(ProcessTask& task) |
|
827 |
{ |
|
828 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
829 |
assert(gch->kind() == CollectedHeap::GenCollectedHeap, |
|
830 |
"not a generational heap"); |
|
11174
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changeset
|
831 |
FlexibleWorkGang* workers = gch->workers(); |
1 | 832 |
assert(workers != NULL, "Need parallel worker threads."); |
11174
fccee5238e70
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parents:
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diff
changeset
|
833 |
_state_set.reset(workers->active_workers(), _generation.promotion_failed()); |
1 | 834 |
ParNewRefProcTaskProxy rp_task(task, _generation, *_generation.next_gen(), |
835 |
_generation.reserved().end(), _state_set); |
|
836 |
workers->run_task(&rp_task); |
|
11174
fccee5238e70
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8688
diff
changeset
|
837 |
_state_set.reset(0 /* bad value in debug if not reset */, |
fccee5238e70
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parents:
8688
diff
changeset
|
838 |
_generation.promotion_failed()); |
1 | 839 |
} |
840 |
||
841 |
void ParNewRefProcTaskExecutor::execute(EnqueueTask& task) |
|
842 |
{ |
|
843 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
11174
fccee5238e70
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parents:
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diff
changeset
|
844 |
FlexibleWorkGang* workers = gch->workers(); |
1 | 845 |
assert(workers != NULL, "Need parallel worker threads."); |
846 |
ParNewRefEnqueueTaskProxy enq_task(task); |
|
847 |
workers->run_task(&enq_task); |
|
848 |
} |
|
849 |
||
850 |
void ParNewRefProcTaskExecutor::set_single_threaded_mode() |
|
851 |
{ |
|
852 |
_state_set.flush(); |
|
853 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
854 |
gch->set_par_threads(0); // 0 ==> non-parallel. |
|
855 |
gch->save_marks(); |
|
856 |
} |
|
857 |
||
858 |
ScanClosureWithParBarrier:: |
|
859 |
ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier) : |
|
860 |
ScanClosure(g, gc_barrier) {} |
|
861 |
||
862 |
EvacuateFollowersClosureGeneral:: |
|
863 |
EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level, |
|
864 |
OopsInGenClosure* cur, |
|
865 |
OopsInGenClosure* older) : |
|
866 |
_gch(gch), _level(level), |
|
867 |
_scan_cur_or_nonheap(cur), _scan_older(older) |
|
868 |
{} |
|
869 |
||
870 |
void EvacuateFollowersClosureGeneral::do_void() { |
|
871 |
do { |
|
872 |
// Beware: this call will lead to closure applications via virtual |
|
873 |
// calls. |
|
874 |
_gch->oop_since_save_marks_iterate(_level, |
|
875 |
_scan_cur_or_nonheap, |
|
876 |
_scan_older); |
|
877 |
} while (!_gch->no_allocs_since_save_marks(_level)); |
|
878 |
} |
|
879 |
||
880 |
||
18025 | 881 |
// A Generation that does parallel young-gen collection. |
882 |
||
1 | 883 |
bool ParNewGeneration::_avoid_promotion_undo = false; |
884 |
||
18025 | 885 |
void ParNewGeneration::handle_promotion_failed(GenCollectedHeap* gch, ParScanThreadStateSet& thread_state_set, ParNewTracer& gc_tracer) { |
886 |
assert(_promo_failure_scan_stack.is_empty(), "post condition"); |
|
887 |
_promo_failure_scan_stack.clear(true); // Clear cached segments. |
|
888 |
||
889 |
remove_forwarding_pointers(); |
|
890 |
if (PrintGCDetails) { |
|
891 |
gclog_or_tty->print(" (promotion failed)"); |
|
892 |
} |
|
893 |
// All the spaces are in play for mark-sweep. |
|
894 |
swap_spaces(); // Make life simpler for CMS || rescan; see 6483690. |
|
895 |
from()->set_next_compaction_space(to()); |
|
896 |
gch->set_incremental_collection_failed(); |
|
897 |
// Inform the next generation that a promotion failure occurred. |
|
898 |
_next_gen->promotion_failure_occurred(); |
|
899 |
||
900 |
// Trace promotion failure in the parallel GC threads |
|
901 |
thread_state_set.trace_promotion_failed(gc_tracer); |
|
902 |
// Single threaded code may have reported promotion failure to the global state |
|
903 |
if (_promotion_failed_info.has_failed()) { |
|
904 |
gc_tracer.report_promotion_failed(_promotion_failed_info); |
|
905 |
} |
|
906 |
// Reset the PromotionFailureALot counters. |
|
907 |
NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) |
|
908 |
} |
|
1 | 909 |
|
910 |
void ParNewGeneration::collect(bool full, |
|
911 |
bool clear_all_soft_refs, |
|
912 |
size_t size, |
|
913 |
bool is_tlab) { |
|
914 |
assert(full || size > 0, "otherwise we don't want to collect"); |
|
18025 | 915 |
|
1 | 916 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
18025 | 917 |
|
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
20282
diff
changeset
|
918 |
_gc_timer->register_gc_start(); |
18025 | 919 |
|
1 | 920 |
assert(gch->kind() == CollectedHeap::GenCollectedHeap, |
921 |
"not a CMS generational heap"); |
|
922 |
AdaptiveSizePolicy* size_policy = gch->gen_policy()->size_policy(); |
|
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
923 |
FlexibleWorkGang* workers = gch->workers(); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
924 |
assert(workers != NULL, "Need workgang for parallel work"); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
925 |
int active_workers = |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
926 |
AdaptiveSizePolicy::calc_active_workers(workers->total_workers(), |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
927 |
workers->active_workers(), |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
928 |
Threads::number_of_non_daemon_threads()); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
929 |
workers->set_active_workers(active_workers); |
1 | 930 |
assert(gch->n_gens() == 2, |
931 |
"Par collection currently only works with single older gen."); |
|
19286
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18025
diff
changeset
|
932 |
_next_gen = gch->next_gen(this); |
1 | 933 |
// Do we have to avoid promotion_undo? |
934 |
if (gch->collector_policy()->is_concurrent_mark_sweep_policy()) { |
|
935 |
set_avoid_promotion_undo(true); |
|
936 |
} |
|
937 |
||
18025 | 938 |
// If the next generation is too full to accommodate worst-case promotion |
1 | 939 |
// from this generation, pass on collection; let the next generation |
940 |
// do it. |
|
941 |
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
|
942 |
gch->set_incremental_collection_failed(); // slight lie, in that we did not even attempt one |
1 | 943 |
return; |
944 |
} |
|
945 |
assert(to()->is_empty(), "Else not collection_attempt_is_safe"); |
|
946 |
||
18025 | 947 |
ParNewTracer gc_tracer; |
948 |
gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start()); |
|
949 |
gch->trace_heap_before_gc(&gc_tracer); |
|
950 |
||
1 | 951 |
init_assuming_no_promotion_failure(); |
952 |
||
953 |
if (UseAdaptiveSizePolicy) { |
|
954 |
set_survivor_overflow(false); |
|
955 |
size_policy->minor_collection_begin(); |
|
956 |
} |
|
957 |
||
18025 | 958 |
GCTraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL); |
1 | 959 |
// Capture heap used before collection (for printing). |
960 |
size_t gch_prev_used = gch->used(); |
|
961 |
||
962 |
SpecializationStats::clear(); |
|
963 |
||
964 |
age_table()->clear(); |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
965 |
to()->clear(SpaceDecorator::Mangle); |
1 | 966 |
|
967 |
gch->save_marks(); |
|
968 |
assert(workers != NULL, "Need parallel worker threads."); |
|
11174
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
969 |
int n_workers = active_workers; |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
970 |
|
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
971 |
// 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
|
972 |
ref_processor()->set_active_mt_degree(n_workers); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
973 |
|
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
974 |
// 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
|
975 |
// because only those workers go through the termination protocol. |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
976 |
ParallelTaskTerminator _term(n_workers, task_queues()); |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
977 |
ParScanThreadStateSet thread_state_set(workers->active_workers(), |
1 | 978 |
*to(), *this, *_next_gen, *task_queues(), |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
979 |
_overflow_stacks, desired_plab_sz(), _term); |
1 | 980 |
|
981 |
ParNewGenTask tsk(this, _next_gen, reserved().end(), &thread_state_set); |
|
982 |
gch->set_par_threads(n_workers); |
|
983 |
gch->rem_set()->prepare_for_younger_refs_iterate(true); |
|
984 |
// It turns out that even when we're using 1 thread, doing the work in a |
|
985 |
// separate thread causes wide variance in run times. We can't help this |
|
986 |
// in the multi-threaded case, but we special-case n=1 here to get |
|
987 |
// repeatable measurements of the 1-thread overhead of the parallel code. |
|
988 |
if (n_workers > 1) { |
|
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2362
diff
changeset
|
989 |
GenCollectedHeap::StrongRootsScope srs(gch); |
1 | 990 |
workers->run_task(&tsk); |
991 |
} else { |
|
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
2362
diff
changeset
|
992 |
GenCollectedHeap::StrongRootsScope srs(gch); |
1 | 993 |
tsk.work(0); |
994 |
} |
|
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
995 |
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
|
996 |
promotion_failed()); |
1 | 997 |
|
998 |
// Process (weak) reference objects found during scavenge. |
|
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
999 |
ReferenceProcessor* rp = ref_processor(); |
1 | 1000 |
IsAliveClosure is_alive(this); |
1001 |
ScanWeakRefClosure scan_weak_ref(this); |
|
1002 |
KeepAliveClosure keep_alive(&scan_weak_ref); |
|
1003 |
ScanClosure scan_without_gc_barrier(this, false); |
|
1004 |
ScanClosureWithParBarrier scan_with_gc_barrier(this, true); |
|
1005 |
set_promo_failure_scan_stack_closure(&scan_without_gc_barrier); |
|
1006 |
EvacuateFollowersClosureGeneral evacuate_followers(gch, _level, |
|
1007 |
&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
|
1008 |
rp->setup_policy(clear_all_soft_refs); |
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
8688
diff
changeset
|
1009 |
// 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
|
1010 |
rp->set_active_mt_degree(active_workers); |
18025 | 1011 |
ReferenceProcessorStats stats; |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1012 |
if (rp->processing_is_mt()) { |
1 | 1013 |
ParNewRefProcTaskExecutor task_executor(*this, thread_state_set); |
18025 | 1014 |
stats = rp->process_discovered_references(&is_alive, &keep_alive, |
1015 |
&evacuate_followers, &task_executor, |
|
1016 |
_gc_timer); |
|
1 | 1017 |
} else { |
1018 |
thread_state_set.flush(); |
|
1019 |
gch->set_par_threads(0); // 0 ==> non-parallel. |
|
1020 |
gch->save_marks(); |
|
18025 | 1021 |
stats = rp->process_discovered_references(&is_alive, &keep_alive, |
1022 |
&evacuate_followers, NULL, |
|
1023 |
_gc_timer); |
|
1 | 1024 |
} |
18025 | 1025 |
gc_tracer.report_gc_reference_stats(stats); |
1 | 1026 |
if (!promotion_failed()) { |
1027 |
// Swap the survivor spaces. |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1028 |
eden()->clear(SpaceDecorator::Mangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1029 |
from()->clear(SpaceDecorator::Mangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1030 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1031 |
// 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
|
1032 |
// 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
|
1033 |
// 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
|
1034 |
// 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
|
1035 |
// 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
|
1036 |
// 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
|
1037 |
// other spaces. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1038 |
to()->mangle_unused_area(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
593
diff
changeset
|
1039 |
} |
1 | 1040 |
swap_spaces(); |
1041 |
||
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
1042 |
// 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
|
1043 |
// for full GC's. |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4574
diff
changeset
|
1044 |
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
|
1045 |
|
1 | 1046 |
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
|
1047 |
|
048f775ae371
8005972: ParNew should not update the tenuring threshold when promotion failed has occurred
brutisso
parents:
15091
diff
changeset
|
1048 |
adjust_desired_tenuring_threshold(); |
1 | 1049 |
} else { |
18025 | 1050 |
handle_promotion_failed(gch, thread_state_set, gc_tracer); |
1 | 1051 |
} |
1052 |
// set new iteration safe limit for the survivor spaces |
|
1053 |
from()->set_concurrent_iteration_safe_limit(from()->top()); |
|
1054 |
to()->set_concurrent_iteration_safe_limit(to()->top()); |
|
1055 |
||
1056 |
if (ResizePLAB) { |
|
13926 | 1057 |
plab_stats()->adjust_desired_plab_sz(n_workers); |
1 | 1058 |
} |
1059 |
||
1060 |
if (PrintGC && !PrintGCDetails) { |
|
1061 |
gch->print_heap_change(gch_prev_used); |
|
1062 |
} |
|
1063 |
||
6254
71523cbc990c
6976378: ParNew: stats are printed unconditionally in debug builds
jcoomes
parents:
6252
diff
changeset
|
1064 |
if (PrintGCDetails && ParallelGCVerbose) { |
71523cbc990c
6976378: ParNew: stats are printed unconditionally in debug builds
jcoomes
parents:
6252
diff
changeset
|
1065 |
TASKQUEUE_STATS_ONLY(thread_state_set.print_termination_stats()); |
71523cbc990c
6976378: ParNew: stats are printed unconditionally in debug builds
jcoomes
parents:
6252
diff
changeset
|
1066 |
TASKQUEUE_STATS_ONLY(thread_state_set.print_taskqueue_stats()); |
71523cbc990c
6976378: ParNew: stats are printed unconditionally in debug builds
jcoomes
parents:
6252
diff
changeset
|
1067 |
} |
6252 | 1068 |
|
1 | 1069 |
if (UseAdaptiveSizePolicy) { |
1070 |
size_policy->minor_collection_end(gch->gc_cause()); |
|
1071 |
size_policy->avg_survived()->sample(from()->used()); |
|
1072 |
} |
|
1073 |
||
22551 | 1074 |
// We need to use a monotonically non-decreasing time in ms |
11755 | 1075 |
// or we will see time-warp warnings and os::javaTimeMillis() |
1076 |
// does not guarantee monotonicity. |
|
1077 |
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
|
1078 |
update_time_of_last_gc(now); |
|
1 | 1079 |
|
1080 |
SpecializationStats::print(); |
|
1081 |
||
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1082 |
rp->set_enqueuing_is_done(true); |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1083 |
if (rp->processing_is_mt()) { |
1 | 1084 |
ParNewRefProcTaskExecutor task_executor(*this, thread_state_set); |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1085 |
rp->enqueue_discovered_references(&task_executor); |
1 | 1086 |
} else { |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1087 |
rp->enqueue_discovered_references(NULL); |
1 | 1088 |
} |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
1089 |
rp->verify_no_references_recorded(); |
18025 | 1090 |
|
1091 |
gch->trace_heap_after_gc(&gc_tracer); |
|
1092 |
gc_tracer.report_tenuring_threshold(tenuring_threshold()); |
|
1093 |
||
21767
41eaa9a17059
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
20282
diff
changeset
|
1094 |
_gc_timer->register_gc_end(); |
18025 | 1095 |
|
1096 |
gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); |
|
1 | 1097 |
} |
1098 |
||
1099 |
static int sum; |
|
1100 |
void ParNewGeneration::waste_some_time() { |
|
1101 |
for (int i = 0; i < 100; i++) { |
|
1102 |
sum += i; |
|
1103 |
} |
|
1104 |
} |
|
1105 |
||
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1106 |
static const oop ClaimedForwardPtr = cast_to_oop<intptr_t>(0x4); |
1 | 1107 |
|
1108 |
// Because of concurrency, there are times where an object for which |
|
1109 |
// "is_forwarded()" is true contains an "interim" forwarding pointer |
|
1110 |
// value. Such a value will soon be overwritten with a real value. |
|
1111 |
// This method requires "obj" to have a forwarding pointer, and waits, if |
|
1112 |
// necessary for a real one to be inserted, and returns it. |
|
1113 |
||
1114 |
oop ParNewGeneration::real_forwardee(oop obj) { |
|
1115 |
oop forward_ptr = obj->forwardee(); |
|
1116 |
if (forward_ptr != ClaimedForwardPtr) { |
|
1117 |
return forward_ptr; |
|
1118 |
} else { |
|
1119 |
return real_forwardee_slow(obj); |
|
1120 |
} |
|
1121 |
} |
|
1122 |
||
1123 |
oop ParNewGeneration::real_forwardee_slow(oop obj) { |
|
1124 |
// Spin-read if it is claimed but not yet written by another thread. |
|
1125 |
oop forward_ptr = obj->forwardee(); |
|
1126 |
while (forward_ptr == ClaimedForwardPtr) { |
|
1127 |
waste_some_time(); |
|
1128 |
assert(obj->is_forwarded(), "precondition"); |
|
1129 |
forward_ptr = obj->forwardee(); |
|
1130 |
} |
|
1131 |
return forward_ptr; |
|
1132 |
} |
|
1133 |
||
1134 |
#ifdef ASSERT |
|
1135 |
bool ParNewGeneration::is_legal_forward_ptr(oop p) { |
|
1136 |
return |
|
1137 |
(_avoid_promotion_undo && p == ClaimedForwardPtr) |
|
1138 |
|| Universe::heap()->is_in_reserved(p); |
|
1139 |
} |
|
1140 |
#endif |
|
1141 |
||
1142 |
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
|
1143 |
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
|
1144 |
// 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
|
1145 |
// than use locking of a common pair of stacks. |
1 | 1146 |
MutexLocker ml(ParGCRareEvent_lock); |
7658
b970e410547a
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
7397
diff
changeset
|
1147 |
preserve_mark(obj, m); |
1 | 1148 |
} |
1149 |
} |
|
1150 |
||
1151 |
// Multiple GC threads may try to promote an object. If the object |
|
1152 |
// is successfully promoted, a forwarding pointer will be installed in |
|
1153 |
// the object in the young generation. This method claims the right |
|
1154 |
// to install the forwarding pointer before it copies the object, |
|
1155 |
// thus avoiding the need to undo the copy as in |
|
1156 |
// copy_to_survivor_space_avoiding_with_undo. |
|
1157 |
||
1158 |
oop ParNewGeneration::copy_to_survivor_space_avoiding_promotion_undo( |
|
1159 |
ParScanThreadState* par_scan_state, oop old, size_t sz, markOop m) { |
|
1160 |
// In the sequential version, this assert also says that the object is |
|
1161 |
// not forwarded. That might not be the case here. It is the case that |
|
1162 |
// the caller observed it to be not forwarded at some time in the past. |
|
1163 |
assert(is_in_reserved(old), "shouldn't be scavenging this oop"); |
|
1164 |
||
1165 |
// The sequential code read "old->age()" below. That doesn't work here, |
|
1166 |
// since the age is in the mark word, and that might be overwritten with |
|
1167 |
// a forwarding pointer by a parallel thread. So we must save the mark |
|
1168 |
// word in a local and then analyze it. |
|
1169 |
oopDesc dummyOld; |
|
1170 |
dummyOld.set_mark(m); |
|
1171 |
assert(!dummyOld.is_forwarded(), |
|
1172 |
"should not be called with forwarding pointer mark word."); |
|
1173 |
||
1174 |
oop new_obj = NULL; |
|
1175 |
oop forward_ptr; |
|
1176 |
||
1177 |
// Try allocating obj in to-space (unless too old) |
|
1178 |
if (dummyOld.age() < tenuring_threshold()) { |
|
1179 |
new_obj = (oop)par_scan_state->alloc_in_to_space(sz); |
|
1180 |
if (new_obj == NULL) { |
|
1181 |
set_survivor_overflow(true); |
|
1182 |
} |
|
1183 |
} |
|
1184 |
||
1185 |
if (new_obj == NULL) { |
|
1186 |
// Either to-space is full or we decided to promote |
|
1187 |
// try allocating obj tenured |
|
1188 |
||
1189 |
// Attempt to install a null forwarding pointer (atomically), |
|
1190 |
// to claim the right to install the real forwarding pointer. |
|
1191 |
forward_ptr = old->forward_to_atomic(ClaimedForwardPtr); |
|
1192 |
if (forward_ptr != NULL) { |
|
1193 |
// someone else beat us to it. |
|
1194 |
return real_forwardee(old); |
|
1195 |
} |
|
1196 |
||
1197 |
new_obj = _next_gen->par_promote(par_scan_state->thread_num(), |
|
1198 |
old, m, sz); |
|
1199 |
||
1200 |
if (new_obj == NULL) { |
|
1201 |
// promotion failed, forward to self |
|
1202 |
_promotion_failed = true; |
|
1203 |
new_obj = old; |
|
1204 |
||
1205 |
preserve_mark_if_necessary(old, m); |
|
18025 | 1206 |
par_scan_state->register_promotion_failure(sz); |
1 | 1207 |
} |
1208 |
||
1209 |
old->forward_to(new_obj); |
|
1210 |
forward_ptr = NULL; |
|
1211 |
} else { |
|
1212 |
// Is in to-space; do copying ourselves. |
|
1213 |
Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)new_obj, sz); |
|
1214 |
forward_ptr = old->forward_to_atomic(new_obj); |
|
1215 |
// Restore the mark word copied above. |
|
1216 |
new_obj->set_mark(m); |
|
1217 |
// Increment age if obj still in new generation |
|
1218 |
new_obj->incr_age(); |
|
1219 |
par_scan_state->age_table()->add(new_obj, sz); |
|
1220 |
} |
|
1221 |
assert(new_obj != NULL, "just checking"); |
|
1222 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1223 |
#ifndef PRODUCT |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1224 |
// 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
|
1225 |
// information. |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1226 |
if (TraceScavenge) { |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1227 |
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
|
1228 |
is_in_reserved(new_obj) ? "copying" : "tenuring", |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1229 |
new_obj->klass()->internal_name(), (void *)old, (void *)new_obj, new_obj->size()); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1230 |
} |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1231 |
#endif |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1232 |
|
1 | 1233 |
if (forward_ptr == NULL) { |
1234 |
oop obj_to_push = new_obj; |
|
1235 |
if (par_scan_state->should_be_partially_scanned(obj_to_push, old)) { |
|
1236 |
// Length field used as index of next element to be scanned. |
|
1237 |
// Real length can be obtained from real_forwardee() |
|
1238 |
arrayOop(old)->set_length(0); |
|
1239 |
obj_to_push = old; |
|
1240 |
assert(obj_to_push->is_forwarded() && obj_to_push->forwardee() != obj_to_push, |
|
1241 |
"push forwarded object"); |
|
1242 |
} |
|
1243 |
// Push it on one of the queues of to-be-scanned objects. |
|
1910 | 1244 |
bool simulate_overflow = false; |
1245 |
NOT_PRODUCT( |
|
1246 |
if (ParGCWorkQueueOverflowALot && should_simulate_overflow()) { |
|
1247 |
// simulate a stack overflow |
|
1248 |
simulate_overflow = true; |
|
1249 |
} |
|
1250 |
) |
|
1251 |
if (simulate_overflow || !par_scan_state->work_queue()->push(obj_to_push)) { |
|
1 | 1252 |
// Add stats for overflow pushes. |
1253 |
if (Verbose && PrintGCDetails) { |
|
1254 |
gclog_or_tty->print("queue overflow!\n"); |
|
1255 |
} |
|
1910 | 1256 |
push_on_overflow_list(old, par_scan_state); |
6252 | 1257 |
TASKQUEUE_STATS_ONLY(par_scan_state->taskqueue_stats().record_overflow(0)); |
1 | 1258 |
} |
1259 |
||
1260 |
return new_obj; |
|
1261 |
} |
|
1262 |
||
1263 |
// Oops. Someone beat us to it. Undo the allocation. Where did we |
|
1264 |
// allocate it? |
|
1265 |
if (is_in_reserved(new_obj)) { |
|
1266 |
// Must be in to_space. |
|
1267 |
assert(to()->is_in_reserved(new_obj), "Checking"); |
|
1268 |
if (forward_ptr == ClaimedForwardPtr) { |
|
1269 |
// Wait to get the real forwarding pointer value. |
|
1270 |
forward_ptr = real_forwardee(old); |
|
1271 |
} |
|
1272 |
par_scan_state->undo_alloc_in_to_space((HeapWord*)new_obj, sz); |
|
1273 |
} |
|
1274 |
||
1275 |
return forward_ptr; |
|
1276 |
} |
|
1277 |
||
1278 |
||
1279 |
// Multiple GC threads may try to promote the same object. If two |
|
1280 |
// or more GC threads copy the object, only one wins the race to install |
|
1281 |
// the forwarding pointer. The other threads have to undo their copy. |
|
1282 |
||
1283 |
oop ParNewGeneration::copy_to_survivor_space_with_undo( |
|
1284 |
ParScanThreadState* par_scan_state, oop old, size_t sz, markOop m) { |
|
1285 |
||
1286 |
// In the sequential version, this assert also says that the object is |
|
1287 |
// not forwarded. That might not be the case here. It is the case that |
|
1288 |
// the caller observed it to be not forwarded at some time in the past. |
|
1289 |
assert(is_in_reserved(old), "shouldn't be scavenging this oop"); |
|
1290 |
||
1291 |
// The sequential code read "old->age()" below. That doesn't work here, |
|
1292 |
// since the age is in the mark word, and that might be overwritten with |
|
1293 |
// a forwarding pointer by a parallel thread. So we must save the mark |
|
1294 |
// word here, install it in a local oopDesc, and then analyze it. |
|
1295 |
oopDesc dummyOld; |
|
1296 |
dummyOld.set_mark(m); |
|
1297 |
assert(!dummyOld.is_forwarded(), |
|
1298 |
"should not be called with forwarding pointer mark word."); |
|
1299 |
||
1300 |
bool failed_to_promote = false; |
|
1301 |
oop new_obj = NULL; |
|
1302 |
oop forward_ptr; |
|
1303 |
||
1304 |
// Try allocating obj in to-space (unless too old) |
|
1305 |
if (dummyOld.age() < tenuring_threshold()) { |
|
1306 |
new_obj = (oop)par_scan_state->alloc_in_to_space(sz); |
|
1307 |
if (new_obj == NULL) { |
|
1308 |
set_survivor_overflow(true); |
|
1309 |
} |
|
1310 |
} |
|
1311 |
||
1312 |
if (new_obj == NULL) { |
|
1313 |
// Either to-space is full or we decided to promote |
|
1314 |
// try allocating obj tenured |
|
1315 |
new_obj = _next_gen->par_promote(par_scan_state->thread_num(), |
|
1316 |
old, m, sz); |
|
1317 |
||
1318 |
if (new_obj == NULL) { |
|
1319 |
// promotion failed, forward to self |
|
1320 |
forward_ptr = old->forward_to_atomic(old); |
|
1321 |
new_obj = old; |
|
1322 |
||
1323 |
if (forward_ptr != NULL) { |
|
1324 |
return forward_ptr; // someone else succeeded |
|
1325 |
} |
|
1326 |
||
1327 |
_promotion_failed = true; |
|
1328 |
failed_to_promote = true; |
|
1329 |
||
1330 |
preserve_mark_if_necessary(old, m); |
|
18025 | 1331 |
par_scan_state->register_promotion_failure(sz); |
1 | 1332 |
} |
1333 |
} else { |
|
1334 |
// Is in to-space; do copying ourselves. |
|
1335 |
Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)new_obj, sz); |
|
1336 |
// Restore the mark word copied above. |
|
1337 |
new_obj->set_mark(m); |
|
1338 |
// Increment age if new_obj still in new generation |
|
1339 |
new_obj->incr_age(); |
|
1340 |
par_scan_state->age_table()->add(new_obj, sz); |
|
1341 |
} |
|
1342 |
assert(new_obj != NULL, "just checking"); |
|
1343 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1344 |
#ifndef PRODUCT |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1345 |
// 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
|
1346 |
// information. |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1347 |
if (TraceScavenge) { |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1348 |
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
|
1349 |
is_in_reserved(new_obj) ? "copying" : "tenuring", |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1350 |
new_obj->klass()->internal_name(), (void *)old, (void *)new_obj, new_obj->size()); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1351 |
} |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1352 |
#endif |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1353 |
|
1 | 1354 |
// Now attempt to install the forwarding pointer (atomically). |
1355 |
// We have to copy the mark word before overwriting with forwarding |
|
1356 |
// ptr, so we can restore it below in the copy. |
|
1357 |
if (!failed_to_promote) { |
|
1358 |
forward_ptr = old->forward_to_atomic(new_obj); |
|
1359 |
} |
|
1360 |
||
1361 |
if (forward_ptr == NULL) { |
|
1362 |
oop obj_to_push = new_obj; |
|
1363 |
if (par_scan_state->should_be_partially_scanned(obj_to_push, old)) { |
|
1364 |
// Length field used as index of next element to be scanned. |
|
1365 |
// Real length can be obtained from real_forwardee() |
|
1366 |
arrayOop(old)->set_length(0); |
|
1367 |
obj_to_push = old; |
|
1368 |
assert(obj_to_push->is_forwarded() && obj_to_push->forwardee() != obj_to_push, |
|
1369 |
"push forwarded object"); |
|
1370 |
} |
|
1371 |
// Push it on one of the queues of to-be-scanned objects. |
|
1910 | 1372 |
bool simulate_overflow = false; |
1373 |
NOT_PRODUCT( |
|
1374 |
if (ParGCWorkQueueOverflowALot && should_simulate_overflow()) { |
|
1375 |
// simulate a stack overflow |
|
1376 |
simulate_overflow = true; |
|
1377 |
} |
|
1378 |
) |
|
1379 |
if (simulate_overflow || !par_scan_state->work_queue()->push(obj_to_push)) { |
|
1 | 1380 |
// Add stats for overflow pushes. |
1910 | 1381 |
push_on_overflow_list(old, par_scan_state); |
6252 | 1382 |
TASKQUEUE_STATS_ONLY(par_scan_state->taskqueue_stats().record_overflow(0)); |
1 | 1383 |
} |
1384 |
||
1385 |
return new_obj; |
|
1386 |
} |
|
1387 |
||
1388 |
// Oops. Someone beat us to it. Undo the allocation. Where did we |
|
1389 |
// allocate it? |
|
1390 |
if (is_in_reserved(new_obj)) { |
|
1391 |
// Must be in to_space. |
|
1392 |
assert(to()->is_in_reserved(new_obj), "Checking"); |
|
1393 |
par_scan_state->undo_alloc_in_to_space((HeapWord*)new_obj, sz); |
|
1394 |
} else { |
|
1395 |
assert(!_avoid_promotion_undo, "Should not be here if avoiding."); |
|
1396 |
_next_gen->par_promote_alloc_undo(par_scan_state->thread_num(), |
|
1397 |
(HeapWord*)new_obj, sz); |
|
1398 |
} |
|
1399 |
||
1400 |
return forward_ptr; |
|
1401 |
} |
|
1402 |
||
1910 | 1403 |
#ifndef PRODUCT |
1404 |
// It's OK to call this multi-threaded; the worst thing |
|
1405 |
// that can happen is that we'll get a bunch of closely |
|
22551 | 1406 |
// spaced simulated overflows, but that's OK, in fact |
1910 | 1407 |
// probably good as it would exercise the overflow code |
1408 |
// under contention. |
|
1409 |
bool ParNewGeneration::should_simulate_overflow() { |
|
1410 |
if (_overflow_counter-- <= 0) { // just being defensive |
|
1411 |
_overflow_counter = ParGCWorkQueueOverflowInterval; |
|
1412 |
return true; |
|
1413 |
} else { |
|
1414 |
return false; |
|
1415 |
} |
|
1416 |
} |
|
1417 |
#endif |
|
1418 |
||
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1419 |
// 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
|
1420 |
// 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
|
1421 |
// 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
|
1422 |
// 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
|
1423 |
// 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
|
1424 |
// 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
|
1425 |
// 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
|
1426 |
// 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
|
1427 |
// 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
|
1428 |
// 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
|
1429 |
// 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
|
1430 |
// 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
|
1431 |
// 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
|
1432 |
// 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
|
1433 |
// 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
|
1434 |
// 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
|
1435 |
// 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
|
1436 |
// (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
|
1437 |
// 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
|
1438 |
// as we were made painfully aware not long ago, see 6786503). |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1439 |
#define BUSY (cast_to_oop<intptr_t>(0x1aff1aff)) |
1910 | 1440 |
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
|
1441 |
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
|
1442 |
if (ParGCUseLocalOverflow) { |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1443 |
// 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
|
1444 |
// overflow stack. |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1445 |
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
|
1446 |
} else { |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
1447 |
assert(!UseCompressedOops, "Error"); |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1448 |
// 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
|
1449 |
// 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
|
1450 |
// 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
|
1451 |
// 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
|
1452 |
// and should be fixed. XXX FIX ME !!! |
1910 | 1453 |
#ifndef PRODUCT |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1454 |
Atomic::inc_ptr(&_num_par_pushes); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1455 |
assert(_num_par_pushes > 0, "Tautology"); |
1910 | 1456 |
#endif |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1457 |
if (from_space_obj->forwardee() == from_space_obj) { |
13195 | 1458 |
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
|
1459 |
listhead->forward_to(from_space_obj); |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1460 |
from_space_obj = listhead; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1461 |
} |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1462 |
oop observed_overflow_list = _overflow_list; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1463 |
oop cur_overflow_list; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1464 |
do { |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1465 |
cur_overflow_list = observed_overflow_list; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1466 |
if (cur_overflow_list != BUSY) { |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1467 |
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
|
1468 |
} else { |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1469 |
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
|
1470 |
} |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1471 |
observed_overflow_list = |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1472 |
(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
|
1473 |
} while (cur_overflow_list != observed_overflow_list); |
1 | 1474 |
} |
1475 |
} |
|
1476 |
||
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1477 |
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
|
1478 |
bool res; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1479 |
|
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
1480 |
if (ParGCUseLocalOverflow) { |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1481 |
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
|
1482 |
} else { |
2362
5e1bfddf919e
6824570: ParNew: Fix memory leak introduced in 6819891
ysr
parents:
2346
diff
changeset
|
1483 |
assert(!UseCompressedOops, "Error"); |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1484 |
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
|
1485 |
} |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1486 |
return res; |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1487 |
} |
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1488 |
|
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1489 |
|
1910 | 1490 |
// *NOTE*: The overflow list manipulation code here and |
1491 |
// in CMSCollector:: are very similar in shape, |
|
1492 |
// except that in the CMS case we thread the objects |
|
1493 |
// directly into the list via their mark word, and do |
|
1494 |
// not need to deal with special cases below related |
|
1495 |
// to chunking of object arrays and promotion failure |
|
1496 |
// handling. |
|
1497 |
// CR 6797058 has been filed to attempt consolidation of |
|
1498 |
// the common code. |
|
1499 |
// Because of the common code, if you make any changes in |
|
1500 |
// the code below, please check the CMS version to see if |
|
1501 |
// similar changes might be needed. |
|
1502 |
// See CMSCollector::par_take_from_overflow_list() for |
|
1503 |
// more extensive documentation comments. |
|
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1504 |
bool ParNewGeneration::take_from_overflow_list_work(ParScanThreadState* par_scan_state) { |
1 | 1505 |
ObjToScanQueue* work_q = par_scan_state->work_queue(); |
1506 |
// How many to take? |
|
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1507 |
size_t objsFromOverflow = MIN2((size_t)(work_q->max_elems() - work_q->size())/4, |
1910 | 1508 |
(size_t)ParGCDesiredObjsFromOverflowList); |
1 | 1509 |
|
6762
f8d1b560700e
6423256: GC stacks should use a better data structure
jcoomes
parents:
6759
diff
changeset
|
1510 |
assert(!UseCompressedOops, "Error"); |
2346
3aa355016e90
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
ysr
parents:
2105
diff
changeset
|
1511 |
assert(par_scan_state->overflow_stack() == NULL, "Error"); |
1 | 1512 |
if (_overflow_list == NULL) return false; |
1513 |
||
1514 |
// Otherwise, there was something there; try claiming the list. |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1515 |
oop prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
1910 | 1516 |
// Trim off a prefix of at most objsFromOverflow items |
1517 |
Thread* tid = Thread::current(); |
|
1518 |
size_t spin_count = (size_t)ParallelGCThreads; |
|
1519 |
size_t sleep_time_millis = MAX2((size_t)1, objsFromOverflow/100); |
|
1520 |
for (size_t spin = 0; prefix == BUSY && spin < spin_count; spin++) { |
|
1521 |
// someone grabbed it before we did ... |
|
1522 |
// ... we spin for a short while... |
|
1523 |
os::sleep(tid, sleep_time_millis, false); |
|
1524 |
if (_overflow_list == NULL) { |
|
1525 |
// nothing left to take |
|
1526 |
return false; |
|
1527 |
} else if (_overflow_list != BUSY) { |
|
1528 |
// try and grab the prefix |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
19286
diff
changeset
|
1529 |
prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
1910 | 1530 |
} |
1 | 1531 |
} |
1910 | 1532 |
if (prefix == NULL || prefix == BUSY) { |
1533 |
// Nothing to take or waited long enough |
|
1534 |
if (prefix == NULL) { |
|
1535 |
// Write back the NULL in case we overwrote it with BUSY above |
|
1536 |
// and it is still the same value. |
|
1537 |
(void) Atomic::cmpxchg_ptr(NULL, &_overflow_list, BUSY); |
|
1538 |
} |
|
1539 |
return false; |
|
1540 |
} |
|
1541 |
assert(prefix != NULL && prefix != BUSY, "Error"); |
|
1542 |
size_t i = 1; |
|
1 | 1543 |
oop cur = prefix; |
593
803947e176bd
6696264: assert("narrow oop can never be zero") for GCBasher & ParNewGC
coleenp
parents:
360
diff
changeset
|
1544 |
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
|
1545 |
i++; cur = cur->list_ptr_from_klass(); |
1 | 1546 |
} |
1547 |
||
1548 |
// Reattach remaining (suffix) to overflow list |
|
1910 | 1549 |
if (cur->klass_or_null() == NULL) { |
1550 |
// Write back the NULL in lieu of the BUSY we wrote |
|
1551 |
// above and it is still the same value. |
|
1552 |
if (_overflow_list == BUSY) { |
|
1553 |
(void) Atomic::cmpxchg_ptr(NULL, &_overflow_list, BUSY); |
|
1 | 1554 |
} |
1910 | 1555 |
} else { |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1556 |
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
|
1557 |
oop suffix = cur->list_ptr_from_klass(); // suffix will be put back on global list |
1910 | 1558 |
cur->set_klass_to_list_ptr(NULL); // break off suffix |
1559 |
// It's possible that the list is still in the empty(busy) state |
|
1560 |
// we left it in a short while ago; in that case we may be |
|
1561 |
// able to place back the suffix. |
|
1562 |
oop observed_overflow_list = _overflow_list; |
|
1563 |
oop cur_overflow_list = observed_overflow_list; |
|
1564 |
bool attached = false; |
|
1565 |
while (observed_overflow_list == BUSY || observed_overflow_list == NULL) { |
|
1566 |
observed_overflow_list = |
|
1567 |
(oop) Atomic::cmpxchg_ptr(suffix, &_overflow_list, cur_overflow_list); |
|
1568 |
if (cur_overflow_list == observed_overflow_list) { |
|
1569 |
attached = true; |
|
1570 |
break; |
|
1571 |
} else cur_overflow_list = observed_overflow_list; |
|
1572 |
} |
|
1573 |
if (!attached) { |
|
1574 |
// Too bad, someone else got in in between; we'll need to do a splice. |
|
1575 |
// Find the last item of suffix list |
|
1576 |
oop last = suffix; |
|
1577 |
while (last->klass_or_null() != NULL) { |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1578 |
last = last->list_ptr_from_klass(); |
1910 | 1579 |
} |
1580 |
// Atomically prepend suffix to current overflow list |
|
1581 |
observed_overflow_list = _overflow_list; |
|
1582 |
do { |
|
1583 |
cur_overflow_list = observed_overflow_list; |
|
1584 |
if (cur_overflow_list != BUSY) { |
|
1585 |
// Do the splice ... |
|
1586 |
last->set_klass_to_list_ptr(cur_overflow_list); |
|
1587 |
} else { // cur_overflow_list == BUSY |
|
1588 |
last->set_klass_to_list_ptr(NULL); |
|
1589 |
} |
|
1590 |
observed_overflow_list = |
|
1591 |
(oop)Atomic::cmpxchg_ptr(suffix, &_overflow_list, cur_overflow_list); |
|
1592 |
} while (cur_overflow_list != observed_overflow_list); |
|
1 | 1593 |
} |
1594 |
} |
|
1595 |
||
1596 |
// Push objects on prefix list onto this thread's work queue |
|
1910 | 1597 |
assert(prefix != NULL && prefix != BUSY, "program logic"); |
1 | 1598 |
cur = prefix; |
1910 | 1599 |
ssize_t n = 0; |
1 | 1600 |
while (cur != NULL) { |
1601 |
oop obj_to_push = cur->forwardee(); |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
13466
diff
changeset
|
1602 |
oop next = cur->list_ptr_from_klass(); |
1 | 1603 |
cur->set_klass(obj_to_push->klass()); |
1910 | 1604 |
// This may be an array object that is self-forwarded. In that case, the list pointer |
1605 |
// space, cur, is not in the Java heap, but rather in the C-heap and should be freed. |
|
1606 |
if (!is_in_reserved(cur)) { |
|
1607 |
// This can become a scaling bottleneck when there is work queue overflow coincident |
|
1608 |
// with promotion failure. |
|
1609 |
oopDesc* f = cur; |
|
13195 | 1610 |
FREE_C_HEAP_ARRAY(oopDesc, f, mtGC); |
1910 | 1611 |
} else if (par_scan_state->should_be_partially_scanned(obj_to_push, cur)) { |
1 | 1612 |
assert(arrayOop(cur)->length() == 0, "entire array remaining to be scanned"); |
1910 | 1613 |
obj_to_push = cur; |
1 | 1614 |
} |
1910 | 1615 |
bool ok = work_q->push(obj_to_push); |
1616 |
assert(ok, "Should have succeeded"); |
|
1 | 1617 |
cur = next; |
1618 |
n++; |
|
1619 |
} |
|
6252 | 1620 |
TASKQUEUE_STATS_ONLY(par_scan_state->note_overflow_refill(n)); |
1910 | 1621 |
#ifndef PRODUCT |
1622 |
assert(_num_par_pushes >= n, "Too many pops?"); |
|
1623 |
Atomic::add_ptr(-(intptr_t)n, &_num_par_pushes); |
|
1624 |
#endif |
|
1 | 1625 |
return true; |
1626 |
} |
|
1910 | 1627 |
#undef BUSY |
1 | 1628 |
|
18025 | 1629 |
void ParNewGeneration::ref_processor_init() { |
1 | 1630 |
if (_ref_processor == NULL) { |
1631 |
// Allocate and initialize a reference processor |
|
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1632 |
_ref_processor = |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1633 |
new ReferenceProcessor(_reserved, // span |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1634 |
ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1635 |
(int) ParallelGCThreads, // mt processing degree |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1636 |
refs_discovery_is_mt(), // mt discovery |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1637 |
(int) ParallelGCThreads, // mt discovery degree |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1638 |
refs_discovery_is_atomic(), // atomic_discovery |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1639 |
NULL, // is_alive_non_header |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7658
diff
changeset
|
1640 |
false); // write barrier for next field updates |
1 | 1641 |
} |
1642 |
} |
|
1643 |
||
1644 |
const char* ParNewGeneration::name() const { |
|
1645 |
return "par new generation"; |
|
1646 |
} |