1 /* 2 * Copyright (c) 2002, 2018, 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 "aot/aotLoader.hpp" 27 #include "classfile/classLoaderDataGraph.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "code/codeCache.hpp" 30 #include "gc/parallel/gcTaskManager.hpp" 31 #include "gc/parallel/parallelScavengeHeap.inline.hpp" 32 #include "gc/parallel/psCardTable.hpp" 33 #include "gc/parallel/psClosure.inline.hpp" 34 #include "gc/parallel/psPromotionManager.hpp" 35 #include "gc/parallel/psPromotionManager.inline.hpp" 36 #include "gc/parallel/psScavenge.inline.hpp" 37 #include "gc/parallel/psTasks.hpp" 38 #include "gc/shared/scavengableNMethods.hpp" 39 #include "gc/shared/taskqueue.inline.hpp" 40 #include "memory/iterator.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.hpp" 43 #include "oops/oop.inline.hpp" 44 #include "runtime/thread.hpp" 45 #include "runtime/vmThread.hpp" 46 #include "services/management.hpp" 47 48 // 49 // ScavengeRootsTask 50 // 51 52 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) { 53 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 54 55 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 56 PSScavengeRootsClosure roots_closure(pm); 57 PSPromoteRootsClosure roots_to_old_closure(pm); 58 59 switch (_root_type) { 60 case universe: 61 Universe::oops_do(&roots_closure); 62 break; 63 64 case jni_handles: 65 JNIHandles::oops_do(&roots_closure); 66 break; 67 68 case threads: 69 { 70 ResourceMark rm; 71 Threads::oops_do(&roots_closure, NULL); 72 } 73 break; 74 75 case object_synchronizer: 76 ObjectSynchronizer::oops_do(&roots_closure); 77 break; 78 79 case system_dictionary: 80 SystemDictionary::oops_do(&roots_closure); 81 break; 82 83 case class_loader_data: 84 { 85 PSScavengeCLDClosure cld_closure(pm); 86 ClassLoaderDataGraph::cld_do(&cld_closure); 87 } 88 break; 89 90 case management: 91 Management::oops_do(&roots_closure); 92 break; 93 94 case jvmti: 95 JvmtiExport::oops_do(&roots_closure); 96 break; 97 98 99 case code_cache: 100 { 101 MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations); 102 ScavengableNMethods::scavengable_nmethods_do(&each_scavengable_code_blob); 103 AOTLoader::oops_do(&roots_closure); 104 } 105 break; 106 107 default: 108 fatal("Unknown root type"); 109 } 110 111 // Do the real work 112 pm->drain_stacks(false); 113 } 114 115 // 116 // ThreadRootsTask 117 // 118 119 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) { 120 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 121 122 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 123 PSScavengeRootsClosure roots_closure(pm); 124 MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations); 125 126 _thread->oops_do(&roots_closure, &roots_in_blobs); 127 128 // Do the real work 129 pm->drain_stacks(false); 130 } 131 132 // 133 // StealTask 134 // 135 136 StealTask::StealTask(ParallelTaskTerminator* t) : 137 _terminator(t) {} 138 139 void StealTask::do_it(GCTaskManager* manager, uint which) { 140 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 141 142 PSPromotionManager* pm = 143 PSPromotionManager::gc_thread_promotion_manager(which); 144 pm->drain_stacks(true); 145 guarantee(pm->stacks_empty(), 146 "stacks should be empty at this point"); 147 148 while(true) { 149 StarTask p; 150 if (PSPromotionManager::steal_depth(which, p)) { 151 TASKQUEUE_STATS_ONLY(pm->record_steal(p)); 152 pm->process_popped_location_depth(p); 153 pm->drain_stacks_depth(true); 154 } else { 155 if (terminator()->offer_termination()) { 156 break; 157 } 158 } 159 } 160 guarantee(pm->stacks_empty(), "stacks should be empty at this point"); 161 } 162 163 // 164 // OldToYoungRootsTask 165 // 166 167 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) { 168 // There are not old-to-young pointers if the old gen is empty. 169 assert(!_old_gen->object_space()->is_empty(), 170 "Should not be called is there is no work"); 171 assert(_old_gen != NULL, "Sanity"); 172 assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity"); 173 assert(_stripe_number < ParallelGCThreads, "Sanity"); 174 175 { 176 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 177 PSCardTable* card_table = ParallelScavengeHeap::heap()->card_table(); 178 179 card_table->scavenge_contents_parallel(_old_gen->start_array(), 180 _old_gen->object_space(), 181 _gen_top, 182 pm, 183 _stripe_number, 184 _stripe_total); 185 186 // Do the real work 187 pm->drain_stacks(false); 188 } 189 }