1 /* 2 * Copyright (c) 2005, 2013, 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/pcTasks.hpp" 29 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" 30 #include "gc_interface/collectedHeap.hpp" 31 #include "memory/universe.hpp" 32 #include "oops/objArrayKlass.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "oops/oop.pcgc.inline.hpp" 35 #include "prims/jvmtiExport.hpp" 36 #include "runtime/fprofiler.hpp" 37 #include "runtime/jniHandles.hpp" 38 #include "runtime/thread.hpp" 39 #include "runtime/vmThread.hpp" 40 #include "services/management.hpp" 41 42 // 43 // ThreadRootsMarkingTask 44 // 45 46 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) { 47 assert(Universe::heap()->is_gc_active(), "called outside gc"); 48 49 ResourceMark rm; 50 51 NOT_PRODUCT(TraceTime tm("ThreadRootsMarkingTask", 52 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty)); 53 ParCompactionManager* cm = 54 ParCompactionManager::gc_thread_compaction_manager(which); 55 56 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); 57 CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true); 58 CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true); 59 60 if (_java_thread != NULL) 61 _java_thread->oops_do( 62 &mark_and_push_closure, 63 &mark_and_push_from_clds, 64 &mark_and_push_in_blobs); 65 66 if (_vm_thread != NULL) 67 _vm_thread->oops_do( 68 &mark_and_push_closure, 69 &mark_and_push_from_clds, 70 &mark_and_push_in_blobs); 71 72 // Do the real work 73 cm->follow_marking_stacks(); 74 } 75 76 77 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) { 78 assert(Universe::heap()->is_gc_active(), "called outside gc"); 79 80 NOT_PRODUCT(TraceTime tm("MarkFromRootsTask", 81 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty)); 82 ParCompactionManager* cm = 83 ParCompactionManager::gc_thread_compaction_manager(which); 84 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); 85 PSParallelCompact::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 CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true); 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 ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true); 124 break; 125 126 case code_cache: 127 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them. 128 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure)); 129 break; 130 131 default: 132 fatal("Unknown root type"); 133 } 134 135 // Do the real work 136 cm->follow_marking_stacks(); 137 } 138 139 140 // 141 // RefProcTaskProxy 142 // 143 144 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which) 145 { 146 assert(Universe::heap()->is_gc_active(), "called outside gc"); 147 148 NOT_PRODUCT(TraceTime tm("RefProcTask", 149 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty)); 150 ParCompactionManager* cm = 151 ParCompactionManager::gc_thread_compaction_manager(which); 152 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); 153 PSParallelCompact::FollowStackClosure follow_stack_closure(cm); 154 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(), 155 mark_and_push_closure, follow_stack_closure); 156 } 157 158 // 159 // RefProcTaskExecutor 160 // 161 162 void RefProcTaskExecutor::execute(ProcessTask& task) 163 { 164 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap(); 165 uint parallel_gc_threads = heap->gc_task_manager()->workers(); 166 uint active_gc_threads = heap->gc_task_manager()->active_workers(); 167 RegionTaskQueueSet* qset = ParCompactionManager::region_array(); 168 ParallelTaskTerminator terminator(active_gc_threads, qset); 169 GCTaskQueue* q = GCTaskQueue::create(); 170 for(uint i=0; i<parallel_gc_threads; i++) { 171 q->enqueue(new RefProcTaskProxy(task, i)); 172 } 173 if (task.marks_oops_alive()) { 174 if (parallel_gc_threads>1) { 175 for (uint j=0; j<active_gc_threads; j++) { 176 q->enqueue(new StealMarkingTask(&terminator)); 177 } 178 } 179 } 180 PSParallelCompact::gc_task_manager()->execute_and_wait(q); 181 } 182 183 void RefProcTaskExecutor::execute(EnqueueTask& task) 184 { 185 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap(); 186 uint parallel_gc_threads = heap->gc_task_manager()->workers(); 187 GCTaskQueue* q = GCTaskQueue::create(); 188 for(uint i=0; i<parallel_gc_threads; i++) { 189 q->enqueue(new RefEnqueueTaskProxy(task, i)); 190 } 191 PSParallelCompact::gc_task_manager()->execute_and_wait(q); 192 } 193 194 // 195 // StealMarkingTask 196 // 197 198 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) : 199 _terminator(t) {} 200 201 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) { 202 assert(Universe::heap()->is_gc_active(), "called outside gc"); 203 204 NOT_PRODUCT(TraceTime tm("StealMarkingTask", 205 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty)); 206 207 ParCompactionManager* cm = 208 ParCompactionManager::gc_thread_compaction_manager(which); 209 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm); 210 211 oop obj = NULL; 212 ObjArrayTask task; 213 int random_seed = 17; 214 do { 215 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) { 216 ObjArrayKlass* k = (ObjArrayKlass*)task.obj()->klass(); 217 k->oop_follow_contents(cm, task.obj(), task.index()); 218 cm->follow_marking_stacks(); 219 } 220 while (ParCompactionManager::steal(which, &random_seed, obj)) { 221 obj->follow_contents(cm); 222 cm->follow_marking_stacks(); 223 } 224 } while (!terminator()->offer_termination()); 225 } 226 227 // 228 // StealRegionCompactionTask 229 // 230 231 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t): 232 _terminator(t) {} 233 234 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) { 235 assert(Universe::heap()->is_gc_active(), "called outside gc"); 236 237 NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask", 238 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty)); 239 240 ParCompactionManager* cm = 241 ParCompactionManager::gc_thread_compaction_manager(which); 242 243 244 // If not all threads are active, get a draining stack 245 // from the list. Else, just use this threads draining stack. 246 uint which_stack_index; 247 bool use_all_workers = manager->all_workers_active(); 248 if (use_all_workers) { 249 which_stack_index = which; 250 assert(manager->active_workers() == ParallelGCThreads, 251 err_msg("all_workers_active has been incorrectly set: " 252 " active %d ParallelGCThreads %d", manager->active_workers(), 253 ParallelGCThreads)); 254 } else { 255 which_stack_index = ParCompactionManager::pop_recycled_stack_index(); 256 } 257 258 cm->set_region_stack_index(which_stack_index); 259 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); 260 if (TraceDynamicGCThreads) { 261 gclog_or_tty->print_cr("StealRegionCompactionTask::do_it " 262 "region_stack_index %d region_stack = 0x%x " 263 " empty (%d) use all workers %d", 264 which_stack_index, ParCompactionManager::region_list(which_stack_index), 265 cm->region_stack()->is_empty(), 266 use_all_workers); 267 } 268 269 // Has to drain stacks first because there may be regions on 270 // preloaded onto the stack and this thread may never have 271 // done a draining task. Are the draining tasks needed? 272 273 cm->drain_region_stacks(); 274 275 size_t region_index = 0; 276 int random_seed = 17; 277 278 // If we're the termination task, try 10 rounds of stealing before 279 // setting the termination flag 280 281 while(true) { 282 if (ParCompactionManager::steal(which, &random_seed, region_index)) { 283 PSParallelCompact::fill_and_update_region(cm, region_index); 284 cm->drain_region_stacks(); 285 } else { 286 if (terminator()->offer_termination()) { 287 break; 288 } 289 // Go around again. 290 } 291 } 292 return; 293 } 294 295 UpdateDensePrefixTask::UpdateDensePrefixTask( 296 PSParallelCompact::SpaceId space_id, 297 size_t region_index_start, 298 size_t region_index_end) : 299 _space_id(space_id), _region_index_start(region_index_start), 300 _region_index_end(region_index_end) {} 301 302 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) { 303 304 NOT_PRODUCT(TraceTime tm("UpdateDensePrefixTask", 305 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty)); 306 307 ParCompactionManager* cm = 308 ParCompactionManager::gc_thread_compaction_manager(which); 309 310 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm, 311 _space_id, 312 _region_index_start, 313 _region_index_end); 314 } 315 316 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) { 317 assert(Universe::heap()->is_gc_active(), "called outside gc"); 318 319 NOT_PRODUCT(TraceTime tm("DrainStacksCompactionTask", 320 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty)); 321 322 ParCompactionManager* cm = 323 ParCompactionManager::gc_thread_compaction_manager(which); 324 325 uint which_stack_index; 326 bool use_all_workers = manager->all_workers_active(); 327 if (use_all_workers) { 328 which_stack_index = which; 329 assert(manager->active_workers() == ParallelGCThreads, 330 err_msg("all_workers_active has been incorrectly set: " 331 " active %d ParallelGCThreads %d", manager->active_workers(), 332 ParallelGCThreads)); 333 } else { 334 which_stack_index = stack_index(); 335 } 336 337 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index)); 338 if (TraceDynamicGCThreads) { 339 gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d " 340 "which_stack_index = %d/empty(%d) " 341 "use all workers %d", 342 which, which_stack_index, 343 cm->region_stack()->is_empty(), 344 use_all_workers); 345 } 346 347 cm->set_region_stack_index(which_stack_index); 348 349 // Process any regions already in the compaction managers stacks. 350 cm->drain_region_stacks(); 351 352 assert(cm->region_stack()->is_empty(), "Not empty"); 353 354 if (!use_all_workers) { 355 // Always give up the region stack. 356 assert(cm->region_stack() == 357 ParCompactionManager::region_list(cm->region_stack_index()), 358 "region_stack and region_stack_index are inconsistent"); 359 ParCompactionManager::push_recycled_stack_index(cm->region_stack_index()); 360 361 if (TraceDynamicGCThreads) { 362 void* old_region_stack = (void*) cm->region_stack(); 363 int old_region_stack_index = cm->region_stack_index(); 364 gclog_or_tty->print_cr("Pushing region stack 0x%x/%d", 365 old_region_stack, old_region_stack_index); 366 } 367 368 cm->set_region_stack(NULL); 369 cm->set_region_stack_index((uint)max_uintx); 370 } 371 }