1 /*
   2  * Copyright (c) 2005, 2011, 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   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
  56   CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true);
  57 
  58   if (_java_thread != NULL)
  59     _java_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);
  60 
  61   if (_vm_thread != NULL)
  62     _vm_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);
  63 
  64   // Do the real work
  65   cm->follow_marking_stacks();
  66 }
  67 
  68 
  69 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
  70   assert(Universe::heap()->is_gc_active(), "called outside gc");
  71 
  72   NOT_PRODUCT(TraceTime tm("MarkFromRootsTask",
  73     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
  74   ParCompactionManager* cm =
  75     ParCompactionManager::gc_thread_compaction_manager(which);
  76   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
  77 
  78   switch (_root_type) {
  79     case universe:
  80       Universe::oops_do(&mark_and_push_closure);
  81       break;
  82 
  83     case reference_processing:
  84       ReferenceProcessor::oops_do(&mark_and_push_closure);
  85       break;
  86 
  87     case jni_handles:
  88       JNIHandles::oops_do(&mark_and_push_closure);
  89       break;
  90 
  91     case threads:
  92     {
  93       ResourceMark rm;
  94       CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);
  95       Threads::oops_do(&mark_and_push_closure, &each_active_code_blob);
  96     }
  97     break;
  98 
  99     case object_synchronizer:
 100       ObjectSynchronizer::oops_do(&mark_and_push_closure);
 101       break;
 102 
 103     case flat_profiler:
 104       FlatProfiler::oops_do(&mark_and_push_closure);
 105       break;
 106 
 107     case management:
 108       Management::oops_do(&mark_and_push_closure);
 109       break;
 110 
 111     case jvmti:
 112       JvmtiExport::oops_do(&mark_and_push_closure);
 113       break;
 114 
 115     case system_dictionary:
 116       SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
 117       break;
 118 
 119     case code_cache:
 120       // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
 121       //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
 122       break;
 123 
 124     default:
 125       fatal("Unknown root type");
 126   }
 127 
 128   // Do the real work
 129   cm->follow_marking_stacks();
 130 }
 131 
 132 
 133 //
 134 // RefProcTaskProxy
 135 //
 136 
 137 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
 138 {
 139   assert(Universe::heap()->is_gc_active(), "called outside gc");
 140 
 141   NOT_PRODUCT(TraceTime tm("RefProcTask",
 142     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
 143   ParCompactionManager* cm =
 144     ParCompactionManager::gc_thread_compaction_manager(which);
 145   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
 146   PSParallelCompact::FollowStackClosure follow_stack_closure(cm);
 147   _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
 148                 mark_and_push_closure, follow_stack_closure);
 149 }
 150 
 151 //
 152 // RefProcTaskExecutor
 153 //
 154 
 155 void RefProcTaskExecutor::execute(ProcessTask& task)
 156 {
 157   ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
 158   uint parallel_gc_threads = heap->gc_task_manager()->workers();
 159   RegionTaskQueueSet* qset = ParCompactionManager::region_array();
 160   ParallelTaskTerminator terminator(parallel_gc_threads, qset);
 161   GCTaskQueue* q = GCTaskQueue::create();
 162   for(uint i=0; i<parallel_gc_threads; i++) {
 163     q->enqueue(new RefProcTaskProxy(task, i));
 164   }
 165   if (task.marks_oops_alive()) {
 166     if (parallel_gc_threads>1) {
 167       for (uint j=0; j<parallel_gc_threads; j++) {
 168         q->enqueue(new StealMarkingTask(&terminator));
 169       }
 170     }
 171   }
 172   PSParallelCompact::gc_task_manager()->execute_and_wait(q);
 173 }
 174 
 175 void RefProcTaskExecutor::execute(EnqueueTask& task)
 176 {
 177   ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
 178   uint parallel_gc_threads = heap->gc_task_manager()->workers();
 179   GCTaskQueue* q = GCTaskQueue::create();
 180   for(uint i=0; i<parallel_gc_threads; i++) {
 181     q->enqueue(new RefEnqueueTaskProxy(task, i));
 182   }
 183   PSParallelCompact::gc_task_manager()->execute_and_wait(q);
 184 }
 185 
 186 //
 187 // StealMarkingTask
 188 //
 189 
 190 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
 191   _terminator(t) {}
 192 
 193 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
 194   assert(Universe::heap()->is_gc_active(), "called outside gc");
 195 
 196   NOT_PRODUCT(TraceTime tm("StealMarkingTask",
 197     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
 198 
 199   ParCompactionManager* cm =
 200     ParCompactionManager::gc_thread_compaction_manager(which);
 201   PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
 202 
 203   oop obj = NULL;
 204   ObjArrayTask task;
 205   int random_seed = 17;
 206   do {
 207     while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
 208       objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
 209       k->oop_follow_contents(cm, task.obj(), task.index());
 210       cm->follow_marking_stacks();
 211     }
 212     while (ParCompactionManager::steal(which, &random_seed, obj)) {
 213       obj->follow_contents(cm);
 214       cm->follow_marking_stacks();
 215     }
 216   } while (!terminator()->offer_termination());
 217 }
 218 
 219 //
 220 // StealRegionCompactionTask
 221 //
 222 
 223 
 224 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
 225   _terminator(t) {}
 226 
 227 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
 228   assert(Universe::heap()->is_gc_active(), "called outside gc");
 229 
 230   NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask",
 231     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
 232 
 233   ParCompactionManager* cm =
 234     ParCompactionManager::gc_thread_compaction_manager(which);
 235 
 236   // Has to drain stacks first because there may be regions on
 237   // preloaded onto the stack and this thread may never have
 238   // done a draining task.  Are the draining tasks needed?
 239 
 240   cm->drain_region_stacks();
 241 
 242   size_t region_index = 0;
 243   int random_seed = 17;
 244 
 245   // If we're the termination task, try 10 rounds of stealing before
 246   // setting the termination flag
 247 
 248   while(true) {
 249     if (ParCompactionManager::steal(which, &random_seed, region_index)) {
 250       PSParallelCompact::fill_and_update_region(cm, region_index);
 251       cm->drain_region_stacks();
 252     } else {
 253       if (terminator()->offer_termination()) {
 254         break;
 255       }
 256       // Go around again.
 257     }
 258   }
 259   return;
 260 }
 261 
 262 UpdateDensePrefixTask::UpdateDensePrefixTask(
 263                                    PSParallelCompact::SpaceId space_id,
 264                                    size_t region_index_start,
 265                                    size_t region_index_end) :
 266   _space_id(space_id), _region_index_start(region_index_start),
 267   _region_index_end(region_index_end) {}
 268 
 269 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
 270 
 271   NOT_PRODUCT(TraceTime tm("UpdateDensePrefixTask",
 272     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
 273 
 274   ParCompactionManager* cm =
 275     ParCompactionManager::gc_thread_compaction_manager(which);
 276 
 277   PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
 278                                                          _space_id,
 279                                                          _region_index_start,
 280                                                          _region_index_end);
 281 }
 282 
 283 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
 284   assert(Universe::heap()->is_gc_active(), "called outside gc");
 285 
 286   NOT_PRODUCT(TraceTime tm("DrainStacksCompactionTask",
 287     PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
 288 
 289   ParCompactionManager* cm =
 290     ParCompactionManager::gc_thread_compaction_manager(which);
 291 
 292   // Process any regions already in the compaction managers stacks.
 293   cm->drain_region_stacks();
 294 }