1 /*
   2  * Copyright (c) 2005, 2016, 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/systemDictionary.hpp"
  28 #include "code/codeCache.hpp"
  29 #include "gc/parallel/parallelScavengeHeap.hpp"
  30 #include "gc/parallel/pcTasks.hpp"
  31 #include "gc/parallel/psCompactionManager.inline.hpp"
  32 #include "gc/parallel/psParallelCompact.hpp"
  33 #include "gc/shared/collectedHeap.hpp"
  34 #include "gc/shared/gcTimer.hpp"
  35 #include "gc/shared/gcTraceTime.inline.hpp"
  36 #include "logging/log.hpp"
  37 #include "memory/resourceArea.hpp"
  38 #include "memory/universe.hpp"
  39 #include "oops/objArrayKlass.inline.hpp"
  40 #include "oops/oop.inline.hpp"
  41 #include "prims/jvmtiExport.hpp"
  42 #include "runtime/fprofiler.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   if (_java_thread != NULL)
  65     _java_thread->oops_do(
  66         &mark_and_push_closure,
  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_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       Threads::oops_do(&mark_and_push_closure, &each_active_code_blob);
 101     }
 102     break;
 103 
 104     case object_synchronizer:
 105       ObjectSynchronizer::oops_do(&mark_and_push_closure);
 106       break;
 107 
 108     case flat_profiler:
 109       FlatProfiler::oops_do(&mark_and_push_closure);
 110       break;
 111 
 112     case management:
 113       Management::oops_do(&mark_and_push_closure);
 114       break;
 115 
 116     case jvmti:
 117       JvmtiExport::oops_do(&mark_and_push_closure);
 118       break;
 119 
 120     case system_dictionary:
 121       SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
 122       break;
 123 
 124     case class_loader_data:
 125       ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);
 126       break;
 127 
 128     case code_cache:
 129       // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
 130       //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
 131       AOTLoader::oops_do(&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   OopTaskQueueSet* qset = ParCompactionManager::stack_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 // CompactionWithStealingTask
 226 //
 227 
 228 CompactionWithStealingTask::CompactionWithStealingTask(ParallelTaskTerminator* t):
 229   _terminator(t) {}
 230 
 231 void CompactionWithStealingTask::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   // Drain the stacks that have been preloaded with regions
 238   // that are ready to fill.
 239 
 240   cm->drain_region_stacks();
 241 
 242   guarantee(cm->region_stack()->is_empty(), "Not empty");
 243 
 244   size_t region_index = 0;
 245   int random_seed = 17;
 246 
 247   while(true) {
 248     if (ParCompactionManager::steal(which, &random_seed, region_index)) {
 249       PSParallelCompact::fill_and_update_region(cm, region_index);
 250       cm->drain_region_stacks();
 251     } else {
 252       if (terminator()->offer_termination()) {
 253         break;
 254       }
 255       // Go around again.
 256     }
 257   }
 258   return;
 259 }
 260 
 261 UpdateDensePrefixTask::UpdateDensePrefixTask(
 262                                    PSParallelCompact::SpaceId space_id,
 263                                    size_t region_index_start,
 264                                    size_t region_index_end) :
 265   _space_id(space_id), _region_index_start(region_index_start),
 266   _region_index_end(region_index_end) {}
 267 
 268 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
 269 
 270   ParCompactionManager* cm =
 271     ParCompactionManager::gc_thread_compaction_manager(which);
 272 
 273   PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
 274                                                          _space_id,
 275                                                          _region_index_start,
 276                                                          _region_index_end);
 277 }