1 /* 2 * Copyright (c) 2005, 2015, 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 "code/codeCache.hpp" 28 #include "gc/parallel/parallelScavengeHeap.hpp" 29 #include "gc/parallel/pcTasks.hpp" 30 #include "gc/parallel/psCompactionManager.inline.hpp" 31 #include "gc/parallel/psParallelCompact.hpp" 32 #include "gc/shared/collectedHeap.hpp" 33 #include "gc/shared/gcTimer.hpp" 34 #include "gc/shared/gcTraceTime.hpp" 35 #include "memory/universe.hpp" 36 #include "oops/objArrayKlass.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "prims/jvmtiExport.hpp" 39 #include "runtime/fprofiler.hpp" 40 #include "runtime/jniHandles.hpp" 41 #include "runtime/thread.hpp" 42 #include "runtime/vmThread.hpp" 43 #include "services/management.hpp" 44 #include "utilities/stack.inline.hpp" 45 46 // 47 // ThreadRootsMarkingTask 48 // 49 50 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) { 51 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 52 53 ResourceMark rm; 54 55 ParCompactionManager* cm = 56 ParCompactionManager::gc_thread_compaction_manager(which); 57 58 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 59 CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true); 60 MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); 61 62 if (_java_thread != NULL) 63 _java_thread->oops_do( 64 &mark_and_push_closure, 65 &mark_and_push_from_clds, 66 &mark_and_push_in_blobs); 67 68 if (_vm_thread != NULL) 69 _vm_thread->oops_do( 70 &mark_and_push_closure, 71 &mark_and_push_from_clds, 72 &mark_and_push_in_blobs); 73 74 // Do the real work 75 cm->follow_marking_stacks(); 76 } 77 78 79 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) { 80 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 81 82 ParCompactionManager* cm = 83 ParCompactionManager::gc_thread_compaction_manager(which); 84 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 85 ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); 86 87 switch (_root_type) { 88 case universe: 89 Universe::oops_do(&mark_and_push_closure); 90 break; 91 92 case jni_handles: 93 JNIHandles::oops_do(&mark_and_push_closure); 94 break; 95 96 case threads: 97 { 98 ResourceMark rm; 99 MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); 100 CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure); 101 Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob); 102 } 103 break; 104 105 case object_synchronizer: 106 ObjectSynchronizer::oops_do(&mark_and_push_closure); 107 break; 108 109 case flat_profiler: 110 FlatProfiler::oops_do(&mark_and_push_closure); 111 break; 112 113 case management: 114 Management::oops_do(&mark_and_push_closure); 115 break; 116 117 case jvmti: 118 JvmtiExport::oops_do(&mark_and_push_closure); 119 break; 120 121 case system_dictionary: 122 SystemDictionary::always_strong_oops_do(&mark_and_push_closure); 123 break; 124 125 case class_loader_data: 126 ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true); 127 break; 128 129 case code_cache: 130 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. 131 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure)); 132 break; 133 134 default: 135 fatal("Unknown root type"); 136 } 137 138 // Do the real work 139 cm->follow_marking_stacks(); 140 } 141 142 143 // 144 // RefProcTaskProxy 145 // 146 147 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which) 148 { 149 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 150 151 ParCompactionManager* cm = 152 ParCompactionManager::gc_thread_compaction_manager(which); 153 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 154 ParCompactionManager::FollowStackClosure follow_stack_closure(cm); 155 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(), 156 mark_and_push_closure, follow_stack_closure); 157 } 158 159 // 160 // RefProcTaskExecutor 161 // 162 163 void RefProcTaskExecutor::execute(ProcessTask& task) 164 { 165 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); 166 uint parallel_gc_threads = heap->gc_task_manager()->workers(); 167 uint active_gc_threads = heap->gc_task_manager()->active_workers(); 168 RegionTaskQueueSet* qset = ParCompactionManager::region_array(); 169 ParallelTaskTerminator terminator(active_gc_threads, qset); 170 GCTaskQueue* q = GCTaskQueue::create(); 171 for(uint i=0; i<parallel_gc_threads; i++) { 172 q->enqueue(new RefProcTaskProxy(task, i)); 173 } 174 if (task.marks_oops_alive()) { 175 if (parallel_gc_threads>1) { 176 for (uint j=0; j<active_gc_threads; j++) { 177 q->enqueue(new StealMarkingTask(&terminator)); 178 } 179 } 180 } 181 PSParallelCompact::gc_task_manager()->execute_and_wait(q); 182 } 183 184 void RefProcTaskExecutor::execute(EnqueueTask& task) 185 { 186 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); 187 uint parallel_gc_threads = heap->gc_task_manager()->workers(); 188 GCTaskQueue* q = GCTaskQueue::create(); 189 for(uint i=0; i<parallel_gc_threads; i++) { 190 q->enqueue(new RefEnqueueTaskProxy(task, i)); 191 } 192 PSParallelCompact::gc_task_manager()->execute_and_wait(q); 193 } 194 195 // 196 // StealMarkingTask 197 // 198 199 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) : 200 _terminator(t) {} 201 202 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) { 203 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 204 205 ParCompactionManager* cm = 206 ParCompactionManager::gc_thread_compaction_manager(which); 207 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 208 209 oop obj = NULL; 210 ObjArrayTask task; 211 int random_seed = 17; 212 do { 213 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) { 214 cm->follow_contents((objArrayOop)task.obj(), task.index()); 215 cm->follow_marking_stacks(); 216 } 217 while (ParCompactionManager::steal(which, &random_seed, obj)) { 218 cm->follow_contents(obj); 219 cm->follow_marking_stacks(); 220 } 221 } while (!terminator()->offer_termination()); 222 } 223 224 // 225 // StealRegionCompactionTask 226 // 227 228 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t): 229 _terminator(t) {} 230 231 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) { 232 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 233 234 ParCompactionManager* cm = 235 ParCompactionManager::gc_thread_compaction_manager(which); 236 237 238 // If not all threads are active, get a draining stack 239 // from the list. Else, just use this threads draining stack. 240 uint which_stack_index; 241 bool use_all_workers = manager->all_workers_active(); 242 if (use_all_workers) { 243 which_stack_index = which; 244 assert(manager->active_workers() == ParallelGCThreads, 245 "all_workers_active has been incorrectly set: " 246 " active %d ParallelGCThreads %u", manager->active_workers(), 247 ParallelGCThreads); 248 } else { 249 which_stack_index = ParCompactionManager::pop_recycled_stack_index(); 250 } 251 252 cm->set_region_stack_index(which_stack_index); 253 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); 254 if (TraceDynamicGCThreads) { 255 gclog_or_tty->print_cr("StealRegionCompactionTask::do_it " 256 "region_stack_index %d region_stack = " PTR_FORMAT " " 257 " empty (%d) use all workers %d", 258 which_stack_index, p2i(ParCompactionManager::region_list(which_stack_index)), 259 cm->region_stack()->is_empty(), 260 use_all_workers); 261 } 262 263 // Has to drain stacks first because there may be regions on 264 // preloaded onto the stack and this thread may never have 265 // done a draining task. Are the draining tasks needed? 266 267 cm->drain_region_stacks(); 268 269 size_t region_index = 0; 270 int random_seed = 17; 271 272 // If we're the termination task, try 10 rounds of stealing before 273 // setting the termination flag 274 275 while(true) { 276 if (ParCompactionManager::steal(which, &random_seed, region_index)) { 277 PSParallelCompact::fill_and_update_region(cm, region_index); 278 cm->drain_region_stacks(); 279 } else { 280 if (terminator()->offer_termination()) { 281 break; 282 } 283 // Go around again. 284 } 285 } 286 return; 287 } 288 289 UpdateDensePrefixTask::UpdateDensePrefixTask( 290 PSParallelCompact::SpaceId space_id, 291 size_t region_index_start, 292 size_t region_index_end) : 293 _space_id(space_id), _region_index_start(region_index_start), 294 _region_index_end(region_index_end) {} 295 296 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) { 297 298 ParCompactionManager* cm = 299 ParCompactionManager::gc_thread_compaction_manager(which); 300 301 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm, 302 _space_id, 303 _region_index_start, 304 _region_index_end); 305 } 306 307 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) { 308 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 309 310 ParCompactionManager* cm = 311 ParCompactionManager::gc_thread_compaction_manager(which); 312 313 uint which_stack_index; 314 bool use_all_workers = manager->all_workers_active(); 315 if (use_all_workers) { 316 which_stack_index = which; 317 assert(manager->active_workers() == ParallelGCThreads, 318 "all_workers_active has been incorrectly set: " 319 " active %d ParallelGCThreads %u", manager->active_workers(), 320 ParallelGCThreads); 321 } else { 322 which_stack_index = stack_index(); 323 } 324 325 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); 326 if (TraceDynamicGCThreads) { 327 gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d " 328 "which_stack_index = %d/empty(%d) " 329 "use all workers %d", 330 which, which_stack_index, 331 cm->region_stack()->is_empty(), 332 use_all_workers); 333 } 334 335 cm->set_region_stack_index(which_stack_index); 336 337 // Process any regions already in the compaction managers stacks. 338 cm->drain_region_stacks(); 339 340 assert(cm->region_stack()->is_empty(), "Not empty"); 341 342 if (!use_all_workers) { 343 // Always give up the region stack. 344 assert(cm->region_stack() == 345 ParCompactionManager::region_list(cm->region_stack_index()), 346 "region_stack and region_stack_index are inconsistent"); 347 ParCompactionManager::push_recycled_stack_index(cm->region_stack_index()); 348 349 if (TraceDynamicGCThreads) { 350 void* old_region_stack = (void*) cm->region_stack(); 351 int old_region_stack_index = cm->region_stack_index(); 352 gclog_or_tty->print_cr("Pushing region stack " PTR_FORMAT "/%d", 353 p2i(old_region_stack), old_region_stack_index); 354 } 355 356 cm->set_region_stack(NULL); 357 cm->set_region_stack_index((uint)max_uintx); 358 } 359 }