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_implementation/parallelScavenge/parallelScavengeHeap.hpp" 29 #include "gc_implementation/parallelScavenge/pcTasks.hpp" 30 #include "gc_implementation/parallelScavenge/psCompactionManager.inline.hpp" 31 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" 32 #include "gc_implementation/shared/gcTimer.hpp" 33 #include "gc_implementation/shared/gcTraceTime.hpp" 34 #include "gc_interface/collectedHeap.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 NOT_PRODUCT(GCTraceTime tm("ThreadRootsMarkingTask", 56 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); 57 ParCompactionManager* cm = 58 ParCompactionManager::gc_thread_compaction_manager(which); 59 60 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 61 CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true); 62 MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); 63 64 if (_java_thread != NULL) 65 _java_thread->oops_do( 66 &mark_and_push_closure, 67 &mark_and_push_from_clds, 68 &mark_and_push_in_blobs); 69 70 if (_vm_thread != NULL) 71 _vm_thread->oops_do( 72 &mark_and_push_closure, 73 &mark_and_push_from_clds, 74 &mark_and_push_in_blobs); 75 76 // Do the real work 77 cm->follow_marking_stacks(); 78 } 79 80 81 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) { 82 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 83 84 NOT_PRODUCT(GCTraceTime tm("MarkFromRootsTask", 85 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); 86 ParCompactionManager* cm = 87 ParCompactionManager::gc_thread_compaction_manager(which); 88 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 89 ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure); 90 91 switch (_root_type) { 92 case universe: 93 Universe::oops_do(&mark_and_push_closure); 94 break; 95 96 case jni_handles: 97 JNIHandles::oops_do(&mark_and_push_closure); 98 break; 99 100 case threads: 101 { 102 ResourceMark rm; 103 MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations); 104 CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure); 105 Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob); 106 } 107 break; 108 109 case object_synchronizer: 110 ObjectSynchronizer::oops_do(&mark_and_push_closure); 111 break; 112 113 case flat_profiler: 114 FlatProfiler::oops_do(&mark_and_push_closure); 115 break; 116 117 case management: 118 Management::oops_do(&mark_and_push_closure); 119 break; 120 121 case jvmti: 122 JvmtiExport::oops_do(&mark_and_push_closure); 123 break; 124 125 case system_dictionary: 126 SystemDictionary::always_strong_oops_do(&mark_and_push_closure); 127 break; 128 129 case class_loader_data: 130 ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true); 131 break; 132 133 case code_cache: 134 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. 135 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure)); 136 break; 137 138 default: 139 fatal("Unknown root type"); 140 } 141 142 // Do the real work 143 cm->follow_marking_stacks(); 144 } 145 146 147 // 148 // RefProcTaskProxy 149 // 150 151 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which) 152 { 153 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 154 155 NOT_PRODUCT(GCTraceTime tm("RefProcTask", 156 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); 157 ParCompactionManager* cm = 158 ParCompactionManager::gc_thread_compaction_manager(which); 159 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 160 ParCompactionManager::FollowStackClosure follow_stack_closure(cm); 161 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(), 162 mark_and_push_closure, follow_stack_closure); 163 } 164 165 // 166 // RefProcTaskExecutor 167 // 168 169 void RefProcTaskExecutor::execute(ProcessTask& task) 170 { 171 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); 172 uint parallel_gc_threads = heap->gc_task_manager()->workers(); 173 uint active_gc_threads = heap->gc_task_manager()->active_workers(); 174 RegionTaskQueueSet* qset = ParCompactionManager::region_array(); 175 ParallelTaskTerminator terminator(active_gc_threads, qset); 176 GCTaskQueue* q = GCTaskQueue::create(); 177 for(uint i=0; i<parallel_gc_threads; i++) { 178 q->enqueue(new RefProcTaskProxy(task, i)); 179 } 180 if (task.marks_oops_alive()) { 181 if (parallel_gc_threads>1) { 182 for (uint j=0; j<active_gc_threads; j++) { 183 q->enqueue(new StealMarkingTask(&terminator)); 184 } 185 } 186 } 187 PSParallelCompact::gc_task_manager()->execute_and_wait(q); 188 } 189 190 void RefProcTaskExecutor::execute(EnqueueTask& task) 191 { 192 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); 193 uint parallel_gc_threads = heap->gc_task_manager()->workers(); 194 GCTaskQueue* q = GCTaskQueue::create(); 195 for(uint i=0; i<parallel_gc_threads; i++) { 196 q->enqueue(new RefEnqueueTaskProxy(task, i)); 197 } 198 PSParallelCompact::gc_task_manager()->execute_and_wait(q); 199 } 200 201 // 202 // StealMarkingTask 203 // 204 205 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) : 206 _terminator(t) {} 207 208 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) { 209 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 210 211 NOT_PRODUCT(GCTraceTime tm("StealMarkingTask", 212 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); 213 214 ParCompactionManager* cm = 215 ParCompactionManager::gc_thread_compaction_manager(which); 216 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm); 217 218 oop obj = NULL; 219 ObjArrayTask task; 220 int random_seed = 17; 221 do { 222 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) { 223 cm->follow_contents((objArrayOop)task.obj(), task.index()); 224 cm->follow_marking_stacks(); 225 } 226 while (ParCompactionManager::steal(which, &random_seed, obj)) { 227 cm->follow_contents(obj); 228 cm->follow_marking_stacks(); 229 } 230 } while (!terminator()->offer_termination()); 231 } 232 233 // 234 // StealRegionCompactionTask 235 // 236 237 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t): 238 _terminator(t) {} 239 240 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) { 241 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 242 243 NOT_PRODUCT(GCTraceTime tm("StealRegionCompactionTask", 244 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); 245 246 ParCompactionManager* cm = 247 ParCompactionManager::gc_thread_compaction_manager(which); 248 249 250 // If not all threads are active, get a draining stack 251 // from the list. Else, just use this threads draining stack. 252 uint which_stack_index; 253 bool use_all_workers = manager->all_workers_active(); 254 if (use_all_workers) { 255 which_stack_index = which; 256 assert(manager->active_workers() == ParallelGCThreads, 257 err_msg("all_workers_active has been incorrectly set: " 258 " active %d ParallelGCThreads " UINTX_FORMAT, manager->active_workers(), 259 ParallelGCThreads)); 260 } else { 261 which_stack_index = ParCompactionManager::pop_recycled_stack_index(); 262 } 263 264 cm->set_region_stack_index(which_stack_index); 265 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); 266 if (TraceDynamicGCThreads) { 267 gclog_or_tty->print_cr("StealRegionCompactionTask::do_it " 268 "region_stack_index %d region_stack = " PTR_FORMAT " " 269 " empty (%d) use all workers %d", 270 which_stack_index, p2i(ParCompactionManager::region_list(which_stack_index)), 271 cm->region_stack()->is_empty(), 272 use_all_workers); 273 } 274 275 // Has to drain stacks first because there may be regions on 276 // preloaded onto the stack and this thread may never have 277 // done a draining task. Are the draining tasks needed? 278 279 cm->drain_region_stacks(); 280 281 size_t region_index = 0; 282 int random_seed = 17; 283 284 // If we're the termination task, try 10 rounds of stealing before 285 // setting the termination flag 286 287 while(true) { 288 if (ParCompactionManager::steal(which, &random_seed, region_index)) { 289 PSParallelCompact::fill_and_update_region(cm, region_index); 290 cm->drain_region_stacks(); 291 } else { 292 if (terminator()->offer_termination()) { 293 break; 294 } 295 // Go around again. 296 } 297 } 298 return; 299 } 300 301 UpdateDensePrefixTask::UpdateDensePrefixTask( 302 PSParallelCompact::SpaceId space_id, 303 size_t region_index_start, 304 size_t region_index_end) : 305 _space_id(space_id), _region_index_start(region_index_start), 306 _region_index_end(region_index_end) {} 307 308 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) { 309 310 NOT_PRODUCT(GCTraceTime tm("UpdateDensePrefixTask", 311 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); 312 313 ParCompactionManager* cm = 314 ParCompactionManager::gc_thread_compaction_manager(which); 315 316 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm, 317 _space_id, 318 _region_index_start, 319 _region_index_end); 320 } 321 322 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) { 323 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 324 325 NOT_PRODUCT(GCTraceTime tm("DrainStacksCompactionTask", 326 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id())); 327 328 ParCompactionManager* cm = 329 ParCompactionManager::gc_thread_compaction_manager(which); 330 331 uint which_stack_index; 332 bool use_all_workers = manager->all_workers_active(); 333 if (use_all_workers) { 334 which_stack_index = which; 335 assert(manager->active_workers() == ParallelGCThreads, 336 err_msg("all_workers_active has been incorrectly set: " 337 " active %d ParallelGCThreads " UINTX_FORMAT, manager->active_workers(), 338 ParallelGCThreads)); 339 } else { 340 which_stack_index = stack_index(); 341 } 342 343 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); 344 if (TraceDynamicGCThreads) { 345 gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d " 346 "which_stack_index = %d/empty(%d) " 347 "use all workers %d", 348 which, which_stack_index, 349 cm->region_stack()->is_empty(), 350 use_all_workers); 351 } 352 353 cm->set_region_stack_index(which_stack_index); 354 355 // Process any regions already in the compaction managers stacks. 356 cm->drain_region_stacks(); 357 358 assert(cm->region_stack()->is_empty(), "Not empty"); 359 360 if (!use_all_workers) { 361 // Always give up the region stack. 362 assert(cm->region_stack() == 363 ParCompactionManager::region_list(cm->region_stack_index()), 364 "region_stack and region_stack_index are inconsistent"); 365 ParCompactionManager::push_recycled_stack_index(cm->region_stack_index()); 366 367 if (TraceDynamicGCThreads) { 368 void* old_region_stack = (void*) cm->region_stack(); 369 int old_region_stack_index = cm->region_stack_index(); 370 gclog_or_tty->print_cr("Pushing region stack " PTR_FORMAT "/%d", 371 p2i(old_region_stack), old_region_stack_index); 372 } 373 374 cm->set_region_stack(NULL); 375 cm->set_region_stack_index((uint)max_uintx); 376 } 377 }