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 "logging/log.hpp"
  36 #include "memory/universe.hpp"
  37 #include "oops/objArrayKlass.inline.hpp"
  38 #include "oops/oop.inline.hpp"
  39 #include "prims/jvmtiExport.hpp"
  40 #include "runtime/fprofiler.hpp"
  41 #include "runtime/jniHandles.hpp"
  42 #include "runtime/thread.hpp"
  43 #include "runtime/vmThread.hpp"
  44 #include "services/management.hpp"
  45 #include "utilities/stack.inline.hpp"
  46 
  47 //
  48 // ThreadRootsMarkingTask
  49 //
  50 
  51 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
  52   assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
  53 
  54   ResourceMark rm;
  55 
  56   ParCompactionManager* cm =
  57     ParCompactionManager::gc_thread_compaction_manager(which);
  58 
  59   ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
  60   CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);
  61   MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
  62 
  63   if (_java_thread != NULL)
  64     _java_thread->oops_do(
  65         &mark_and_push_closure,
  66         &mark_and_push_from_clds,
  67         &mark_and_push_in_blobs);
  68 
  69   if (_vm_thread != NULL)
  70     _vm_thread->oops_do(
  71         &mark_and_push_closure,
  72         &mark_and_push_from_clds,
  73         &mark_and_push_in_blobs);
  74 
  75   // Do the real work
  76   cm->follow_marking_stacks();
  77 }
  78 
  79 
  80 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
  81   assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
  82 
  83   ParCompactionManager* cm =
  84     ParCompactionManager::gc_thread_compaction_manager(which);
  85   ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
  86   ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);
  87 
  88   switch (_root_type) {
  89     case universe:
  90       Universe::oops_do(&mark_and_push_closure);
  91       break;
  92 
  93     case jni_handles:
  94       JNIHandles::oops_do(&mark_and_push_closure);
  95       break;
  96 
  97     case threads:
  98     {
  99       ResourceMark rm;
 100       MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
 101       CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure);
 102       Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob);
 103     }
 104     break;
 105 
 106     case object_synchronizer:
 107       ObjectSynchronizer::oops_do(&mark_and_push_closure);
 108       break;
 109 
 110     case flat_profiler:
 111       FlatProfiler::oops_do(&mark_and_push_closure);
 112       break;
 113 
 114     case management:
 115       Management::oops_do(&mark_and_push_closure);
 116       break;
 117 
 118     case jvmti:
 119       JvmtiExport::oops_do(&mark_and_push_closure);
 120       break;
 121 
 122     case system_dictionary:
 123       SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
 124       break;
 125 
 126     case class_loader_data:
 127       ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);
 128       break;
 129 
 130     case code_cache:
 131       // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
 132       //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
 133       break;
 134 
 135     default:
 136       fatal("Unknown root type");
 137   }
 138 
 139   // Do the real work
 140   cm->follow_marking_stacks();
 141 }
 142 
 143 
 144 //
 145 // RefProcTaskProxy
 146 //
 147 
 148 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
 149 {
 150   assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
 151 
 152   ParCompactionManager* cm =
 153     ParCompactionManager::gc_thread_compaction_manager(which);
 154   ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
 155   ParCompactionManager::FollowStackClosure follow_stack_closure(cm);
 156   _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
 157                 mark_and_push_closure, follow_stack_closure);
 158 }
 159 
 160 //
 161 // RefProcTaskExecutor
 162 //
 163 
 164 void RefProcTaskExecutor::execute(ProcessTask& task)
 165 {
 166   ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
 167   uint parallel_gc_threads = heap->gc_task_manager()->workers();
 168   uint active_gc_threads = heap->gc_task_manager()->active_workers();
 169   RegionTaskQueueSet* qset = ParCompactionManager::region_array();
 170   ParallelTaskTerminator terminator(active_gc_threads, qset);
 171   GCTaskQueue* q = GCTaskQueue::create();
 172   for(uint i=0; i<parallel_gc_threads; i++) {
 173     q->enqueue(new RefProcTaskProxy(task, i));
 174   }
 175   if (task.marks_oops_alive()) {
 176     if (parallel_gc_threads>1) {
 177       for (uint j=0; j<active_gc_threads; j++) {
 178         q->enqueue(new StealMarkingTask(&terminator));
 179       }
 180     }
 181   }
 182   PSParallelCompact::gc_task_manager()->execute_and_wait(q);
 183 }
 184 
 185 void RefProcTaskExecutor::execute(EnqueueTask& task)
 186 {
 187   ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
 188   uint parallel_gc_threads = heap->gc_task_manager()->workers();
 189   GCTaskQueue* q = GCTaskQueue::create();
 190   for(uint i=0; i<parallel_gc_threads; i++) {
 191     q->enqueue(new RefEnqueueTaskProxy(task, i));
 192   }
 193   PSParallelCompact::gc_task_manager()->execute_and_wait(q);
 194 }
 195 
 196 //
 197 // StealMarkingTask
 198 //
 199 
 200 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
 201   _terminator(t) {}
 202 
 203 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
 204   assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
 205 
 206   ParCompactionManager* cm =
 207     ParCompactionManager::gc_thread_compaction_manager(which);
 208   ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
 209 
 210   oop obj = NULL;
 211   ObjArrayTask task;
 212   int random_seed = 17;
 213   do {
 214     while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
 215       cm->follow_contents((objArrayOop)task.obj(), task.index());
 216       cm->follow_marking_stacks();
 217     }
 218     while (ParCompactionManager::steal(which, &random_seed, obj)) {
 219       cm->follow_contents(obj);
 220       cm->follow_marking_stacks();
 221     }
 222   } while (!terminator()->offer_termination());
 223 }
 224 
 225 //
 226 // StealRegionCompactionTask
 227 //
 228 
 229 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
 230   _terminator(t) {}
 231 
 232 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
 233   assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
 234 
 235   ParCompactionManager* cm =
 236     ParCompactionManager::gc_thread_compaction_manager(which);
 237 
 238 
 239   // If not all threads are active, get a draining stack
 240   // from the list.  Else, just use this threads draining stack.
 241   uint which_stack_index;
 242   bool use_all_workers = manager->all_workers_active();
 243   if (use_all_workers) {
 244     which_stack_index = which;
 245     assert(manager->active_workers() == ParallelGCThreads,
 246            "all_workers_active has been incorrectly set: "
 247            " active %d  ParallelGCThreads %u", manager->active_workers(),
 248            ParallelGCThreads);
 249   } else {
 250     which_stack_index = ParCompactionManager::pop_recycled_stack_index();
 251   }
 252 
 253   cm->set_region_stack_index(which_stack_index);
 254   cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));








 255 
 256   // Has to drain stacks first because there may be regions on
 257   // preloaded onto the stack and this thread may never have
 258   // done a draining task.  Are the draining tasks needed?
 259 
 260   cm->drain_region_stacks();
 261 
 262   size_t region_index = 0;
 263   int random_seed = 17;
 264 
 265   // If we're the termination task, try 10 rounds of stealing before
 266   // setting the termination flag
 267 
 268   while(true) {
 269     if (ParCompactionManager::steal(which, &random_seed, region_index)) {
 270       PSParallelCompact::fill_and_update_region(cm, region_index);
 271       cm->drain_region_stacks();
 272     } else {
 273       if (terminator()->offer_termination()) {
 274         break;
 275       }
 276       // Go around again.
 277     }
 278   }
 279   return;
 280 }
 281 
 282 UpdateDensePrefixTask::UpdateDensePrefixTask(
 283                                    PSParallelCompact::SpaceId space_id,
 284                                    size_t region_index_start,
 285                                    size_t region_index_end) :
 286   _space_id(space_id), _region_index_start(region_index_start),
 287   _region_index_end(region_index_end) {}
 288 
 289 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
 290 
 291   ParCompactionManager* cm =
 292     ParCompactionManager::gc_thread_compaction_manager(which);
 293 
 294   PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
 295                                                          _space_id,
 296                                                          _region_index_start,
 297                                                          _region_index_end);
 298 }
 299 
 300 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
 301   assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
 302 
 303   ParCompactionManager* cm =
 304     ParCompactionManager::gc_thread_compaction_manager(which);
 305 
 306   uint which_stack_index;
 307   bool use_all_workers = manager->all_workers_active();
 308   if (use_all_workers) {
 309     which_stack_index = which;
 310     assert(manager->active_workers() == ParallelGCThreads,
 311            "all_workers_active has been incorrectly set: "
 312            " active %d  ParallelGCThreads %u", manager->active_workers(),
 313            ParallelGCThreads);
 314   } else {
 315     which_stack_index = stack_index();
 316   }
 317 
 318   cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));








 319 
 320   cm->set_region_stack_index(which_stack_index);
 321 
 322   // Process any regions already in the compaction managers stacks.
 323   cm->drain_region_stacks();
 324 
 325   assert(cm->region_stack()->is_empty(), "Not empty");
 326 
 327   if (!use_all_workers) {
 328     // Always give up the region stack.
 329     assert(cm->region_stack() ==
 330            ParCompactionManager::region_list(cm->region_stack_index()),
 331            "region_stack and region_stack_index are inconsistent");
 332     ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());







 333 
 334     cm->set_region_stack(NULL);
 335     cm->set_region_stack_index((uint)max_uintx);
 336   }
 337 }
--- EOF ---