1 /* 2 * Copyright (c) 2005, 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/parallelScavengeHeap.hpp" 31 #include "gc/parallel/pcTasks.hpp" 32 #include "gc/parallel/psCompactionManager.inline.hpp" 33 #include "gc/parallel/psParallelCompact.inline.hpp" 34 #include "gc/shared/collectedHeap.hpp" 35 #include "gc/shared/gcTimer.hpp" 36 #include "gc/shared/gcTraceTime.inline.hpp" 37 #include "logging/log.hpp" 38 #include "memory/resourceArea.hpp" 39 #include "memory/universe.hpp" 40 #include "oops/objArrayKlass.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/jniHandles.hpp" 44 #include "runtime/thread.hpp" 45 #include "runtime/vmThread.hpp" 46 #include "services/management.hpp" 47 #include "utilities/stack.inline.hpp" 48 49 // 50 // ThreadRootsMarkingTask 51 // 52 53 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) { 54 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 55 56 ResourceMark rm; 57 58 ParCompactionManager* cm = 59 ParCompactionManager::gc_thread_compaction_manager(which); 60 61 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 62 MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); 63 64 _thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs); 65 66 // Do the real work 67 cm->follow_marking_stacks(); 68 } 69 70 71 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) { 72 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 73 74 ParCompactionManager* cm = 75 ParCompactionManager::gc_thread_compaction_manager(which); 76 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 77 78 switch (_root_type) { 79 case universe: 80 Universe::oops_do(&mark_and_push_closure); 81 break; 82 83 case jni_handles: 84 JNIHandles::oops_do(&mark_and_push_closure); 85 break; 86 87 case threads: 88 { 89 ResourceMark rm; 90 MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); 91 Threads::oops_do(&mark_and_push_closure, &each_active_code_blob); 92 } 93 break; 94 95 case object_synchronizer: 96 ObjectSynchronizer::oops_do(&mark_and_push_closure); 97 break; 98 99 case management: 100 Management::oops_do(&mark_and_push_closure); 101 break; 102 103 case jvmti: 104 JvmtiExport::oops_do(&mark_and_push_closure); 105 break; 106 107 case system_dictionary: 108 SystemDictionary::oops_do(&mark_and_push_closure); 109 break; 110 111 case class_loader_data: { 112 CLDToOopClosure cld_closure(&mark_and_push_closure); 113 ClassLoaderDataGraph::always_strong_cld_do(&cld_closure); 114 } 115 break; 116 117 case code_cache: 118 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. 119 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure)); 120 AOTLoader::oops_do(&mark_and_push_closure); 121 break; 122 123 default: 124 fatal("Unknown root type"); 125 } 126 127 // Do the real work 128 cm->follow_marking_stacks(); 129 } 130 131 132 // 133 // RefProcTaskProxy 134 // 135 136 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which) 137 { 138 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 139 140 ParCompactionManager* cm = 141 ParCompactionManager::gc_thread_compaction_manager(which); 142 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 143 ParCompactionManager::FollowStackClosure follow_stack_closure(cm); 144 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(), 145 mark_and_push_closure, follow_stack_closure); 146 } 147 148 // 149 // RefProcTaskExecutor 150 // 151 152 void RefProcTaskExecutor::execute(ProcessTask& task, uint ergo_workers) 153 { 154 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); 155 uint active_gc_threads = heap->gc_task_manager()->active_workers(); 156 assert(active_gc_threads == ergo_workers, 157 "Ergonomically chosen workers (%u) must be equal to active workers (%u)", 158 ergo_workers, active_gc_threads); 159 OopTaskQueueSet* qset = ParCompactionManager::stack_array(); 160 ParallelTaskTerminator terminator(active_gc_threads, qset); 161 GCTaskQueue* q = GCTaskQueue::create(); 162 for(uint i=0; i<active_gc_threads; i++) { 163 q->enqueue(new RefProcTaskProxy(task, i)); 164 } 165 if (task.marks_oops_alive() && (active_gc_threads>1)) { 166 for (uint j=0; j<active_gc_threads; j++) { 167 q->enqueue(new StealMarkingTask(&terminator)); 168 } 169 } 170 PSParallelCompact::gc_task_manager()->execute_and_wait(q); 171 } 172 173 // 174 // StealMarkingTask 175 // 176 177 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) : 178 _terminator(t) {} 179 180 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) { 181 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 182 183 ParCompactionManager* cm = 184 ParCompactionManager::gc_thread_compaction_manager(which); 185 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 186 187 oop obj = NULL; 188 ObjArrayTask task; 189 do { 190 while (ParCompactionManager::steal_objarray(which, task)) { 191 cm->follow_contents((objArrayOop)task.obj(), task.index()); 192 cm->follow_marking_stacks(); 193 } 194 while (ParCompactionManager::steal(which, obj)) { 195 cm->follow_contents(obj); 196 cm->follow_marking_stacks(); 197 } 198 } while (!terminator()->offer_termination()); 199 } 200 201 // 202 // CompactionWithStealingTask 203 // 204 205 CompactionWithStealingTask::CompactionWithStealingTask(ParallelTaskTerminator* t): 206 _terminator(t) {} 207 208 void CompactionWithStealingTask::do_it(GCTaskManager* manager, uint which) { 209 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 210 211 ParCompactionManager* cm = 212 ParCompactionManager::gc_thread_compaction_manager(which); 213 214 // Drain the stacks that have been preloaded with regions 215 // that are ready to fill. 216 217 cm->drain_region_stacks(); 218 219 guarantee(cm->region_stack()->is_empty(), "Not empty"); 220 221 size_t region_index = 0; 222 223 while(true) { 224 if (ParCompactionManager::steal(which, region_index)) { 225 PSParallelCompact::fill_and_update_region(cm, region_index); 226 cm->drain_region_stacks(); 227 } else { 228 if (terminator()->offer_termination()) { 229 break; 230 } 231 // Go around again. 232 } 233 } 234 return; 235 } 236 237 UpdateDensePrefixTask::UpdateDensePrefixTask( 238 PSParallelCompact::SpaceId space_id, 239 size_t region_index_start, 240 size_t region_index_end) : 241 _space_id(space_id), _region_index_start(region_index_start), 242 _region_index_end(region_index_end) {} 243 244 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) { 245 246 ParCompactionManager* cm = 247 ParCompactionManager::gc_thread_compaction_manager(which); 248 249 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm, 250 _space_id, 251 _region_index_start, 252 _region_index_end); 253 }