1 /* 2 * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "gc/parallel/objectStartArray.hpp" 28 #include "gc/parallel/parMarkBitMap.inline.hpp" 29 #include "gc/parallel/parallelScavengeHeap.hpp" 30 #include "gc/parallel/psCompactionManager.inline.hpp" 31 #include "gc/parallel/psOldGen.hpp" 32 #include "gc/parallel/psParallelCompact.inline.hpp" 33 #include "gc/shared/taskqueue.inline.hpp" 34 #include "logging/log.hpp" 35 #include "memory/iterator.inline.hpp" 36 #include "oops/access.inline.hpp" 37 #include "oops/compressedOops.inline.hpp" 38 #include "oops/instanceKlass.inline.hpp" 39 #include "oops/instanceMirrorKlass.inline.hpp" 40 #include "oops/objArrayKlass.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "runtime/atomic.hpp" 43 44 PSOldGen* ParCompactionManager::_old_gen = NULL; 45 ParCompactionManager** ParCompactionManager::_manager_array = NULL; 46 47 OopTaskQueueSet* ParCompactionManager::_stack_array = NULL; 48 ParCompactionManager::ObjArrayTaskQueueSet* 49 ParCompactionManager::_objarray_queues = NULL; 50 ObjectStartArray* ParCompactionManager::_start_array = NULL; 51 ParMarkBitMap* ParCompactionManager::_mark_bitmap = NULL; 52 RegionTaskQueueSet* ParCompactionManager::_region_array = NULL; 53 54 ParCompactionManager::ParCompactionManager() : 55 _action(CopyAndUpdate) { 56 57 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); 58 59 _old_gen = heap->old_gen(); 60 _start_array = old_gen()->start_array(); 61 62 marking_stack()->initialize(); 63 _objarray_stack.initialize(); 64 _region_stack.initialize(); 65 66 reset_bitmap_query_cache(); 67 } 68 69 void ParCompactionManager::initialize(ParMarkBitMap* mbm) { 70 assert(ParallelScavengeHeap::heap() != NULL, 71 "Needed for initialization"); 72 73 _mark_bitmap = mbm; 74 75 uint parallel_gc_threads = ParallelScavengeHeap::heap()->workers().total_workers(); 76 77 assert(_manager_array == NULL, "Attempt to initialize twice"); 78 _manager_array = NEW_C_HEAP_ARRAY(ParCompactionManager*, parallel_gc_threads+1, mtGC); 79 80 _stack_array = new OopTaskQueueSet(parallel_gc_threads); 81 guarantee(_stack_array != NULL, "Could not allocate stack_array"); 82 _objarray_queues = new ObjArrayTaskQueueSet(parallel_gc_threads); 83 guarantee(_objarray_queues != NULL, "Could not allocate objarray_queues"); 84 _region_array = new RegionTaskQueueSet(parallel_gc_threads); 85 guarantee(_region_array != NULL, "Could not allocate region_array"); 86 87 // Create and register the ParCompactionManager(s) for the worker threads. 88 for(uint i=0; i<parallel_gc_threads; i++) { 89 _manager_array[i] = new ParCompactionManager(); 90 guarantee(_manager_array[i] != NULL, "Could not create ParCompactionManager"); 91 stack_array()->register_queue(i, _manager_array[i]->marking_stack()); 92 _objarray_queues->register_queue(i, &_manager_array[i]->_objarray_stack); 93 region_array()->register_queue(i, _manager_array[i]->region_stack()); 94 } 95 96 // The VMThread gets its own ParCompactionManager, which is not available 97 // for work stealing. 98 _manager_array[parallel_gc_threads] = new ParCompactionManager(); 99 guarantee(_manager_array[parallel_gc_threads] != NULL, 100 "Could not create ParCompactionManager"); 101 assert(ParallelScavengeHeap::heap()->workers().total_workers() != 0, 102 "Not initialized?"); 103 } 104 105 void ParCompactionManager::reset_all_bitmap_query_caches() { 106 uint parallel_gc_threads = ParallelScavengeHeap::heap()->workers().total_workers(); 107 for (uint i=0; i<=parallel_gc_threads; i++) { 108 _manager_array[i]->reset_bitmap_query_cache(); 109 } 110 } 111 112 bool ParCompactionManager::should_update() { 113 assert(action() != NotValid, "Action is not set"); 114 return (action() == ParCompactionManager::Update) || 115 (action() == ParCompactionManager::CopyAndUpdate) || 116 (action() == ParCompactionManager::UpdateAndCopy); 117 } 118 119 bool ParCompactionManager::should_copy() { 120 assert(action() != NotValid, "Action is not set"); 121 return (action() == ParCompactionManager::Copy) || 122 (action() == ParCompactionManager::CopyAndUpdate) || 123 (action() == ParCompactionManager::UpdateAndCopy); 124 } 125 126 ParCompactionManager* 127 ParCompactionManager::gc_thread_compaction_manager(uint index) { 128 assert(index < ParallelGCThreads, "index out of range"); 129 assert(_manager_array != NULL, "Sanity"); 130 return _manager_array[index]; 131 } 132 133 void ParCompactionManager::follow_marking_stacks() { 134 do { 135 // Drain the overflow stack first, to allow stealing from the marking stack. 136 oop obj; 137 while (marking_stack()->pop_overflow(obj)) { 138 follow_contents(obj); 139 } 140 while (marking_stack()->pop_local(obj)) { 141 follow_contents(obj); 142 } 143 144 // Process ObjArrays one at a time to avoid marking stack bloat. 145 ObjArrayTask task; 146 if (_objarray_stack.pop_overflow(task) || _objarray_stack.pop_local(task)) { 147 follow_array((objArrayOop)task.obj(), task.index()); 148 } 149 } while (!marking_stacks_empty()); 150 151 assert(marking_stacks_empty(), "Sanity"); 152 } 153 154 void ParCompactionManager::drain_region_stacks() { 155 do { 156 // Drain overflow stack first so other threads can steal. 157 size_t region_index; 158 while (region_stack()->pop_overflow(region_index)) { 159 PSParallelCompact::fill_and_update_region(this, region_index); 160 } 161 162 while (region_stack()->pop_local(region_index)) { 163 PSParallelCompact::fill_and_update_region(this, region_index); 164 } 165 } while (!region_stack()->is_empty()); 166 }