1 /*
   2  * Copyright (c) 2002, 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/cardTableExtension.hpp"
  29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
  30 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp"
  31 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
  32 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
  33 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
  34 #include "gc_implementation/parallelScavenge/psTasks.hpp"
  35 #include "memory/iterator.hpp"
  36 #include "memory/universe.hpp"
  37 #include "oops/oop.inline.hpp"
  38 #include "oops/oop.psgc.inline.hpp"
  39 #include "runtime/fprofiler.hpp"
  40 #include "runtime/thread.hpp"
  41 #include "runtime/vmThread.hpp"
  42 #include "services/management.hpp"
  43 #include "utilities/taskqueue.hpp"
  44 
  45 //
  46 // ScavengeRootsTask
  47 //
  48 
  49 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
  50   assert(Universe::heap()->is_gc_active(), "called outside gc");
  51 
  52   PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
  53   PSScavengeRootsClosure roots_closure(pm);
  54 
  55   switch (_root_type) {
  56     case universe:
  57       Universe::oops_do(&roots_closure);
  58       break;
  59 
  60     case jni_handles:
  61       JNIHandles::oops_do(&roots_closure);
  62       break;
  63 
  64     case threads:
  65     {
  66       ResourceMark rm;
  67       Threads::oops_do(&roots_closure, NULL);
  68     }
  69     break;
  70 
  71     case object_synchronizer:
  72       ObjectSynchronizer::oops_do(&roots_closure);
  73       break;
  74 
  75     case flat_profiler:
  76       FlatProfiler::oops_do(&roots_closure);
  77       break;
  78 
  79     case system_dictionary:
  80       SystemDictionary::oops_do(&roots_closure);
  81       break;
  82 
  83     case management:
  84       Management::oops_do(&roots_closure);
  85       break;
  86 
  87     case jvmti:
  88       JvmtiExport::oops_do(&roots_closure);
  89       break;
  90 
  91 
  92     case code_cache:
  93       {
  94         CodeBlobToOopClosure each_scavengable_code_blob(&roots_closure, /*do_marking=*/ true);
  95         CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
  96       }
  97       break;
  98 
  99     default:
 100       fatal("Unknown root type");
 101   }
 102 
 103   // Do the real work
 104   pm->drain_stacks(false);
 105 }
 106 
 107 //
 108 // ThreadRootsTask
 109 //
 110 
 111 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
 112   assert(Universe::heap()->is_gc_active(), "called outside gc");
 113 
 114   PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
 115   PSScavengeRootsClosure roots_closure(pm);
 116   CodeBlobToOopClosure roots_in_blobs(&roots_closure, /*do_marking=*/ true);
 117 
 118   if (_java_thread != NULL)
 119     _java_thread->oops_do(&roots_closure, &roots_in_blobs);
 120 
 121   if (_vm_thread != NULL)
 122     _vm_thread->oops_do(&roots_closure, &roots_in_blobs);
 123 
 124   // Do the real work
 125   pm->drain_stacks(false);
 126 }
 127 
 128 //
 129 // StealTask
 130 //
 131 
 132 StealTask::StealTask(ParallelTaskTerminator* t) :
 133   _terminator(t) {}
 134 
 135 void StealTask::do_it(GCTaskManager* manager, uint which) {
 136   assert(Universe::heap()->is_gc_active(), "called outside gc");
 137 
 138   PSPromotionManager* pm =
 139     PSPromotionManager::gc_thread_promotion_manager(which);
 140   pm->drain_stacks(true);
 141   guarantee(pm->stacks_empty(),
 142             "stacks should be empty at this point");
 143 
 144   int random_seed = 17;
 145   while(true) {
 146     StarTask p;
 147     if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
 148       TASKQUEUE_STATS_ONLY(pm->record_steal(p));
 149       pm->process_popped_location_depth(p);
 150       pm->drain_stacks_depth(true);
 151     } else {
 152       if (terminator()->offer_termination()) {
 153         break;
 154       }
 155     }
 156   }
 157   guarantee(pm->stacks_empty(), "stacks should be empty at this point");
 158 }
 159 
 160 //
 161 // SerialOldToYoungRootsTask
 162 //
 163 
 164 void SerialOldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
 165   assert(_gen != NULL, "Sanity");
 166   assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
 167 
 168   {
 169     PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
 170 
 171     assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
 172     CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
 173     // FIX ME! Assert that card_table is the type we believe it to be.
 174 
 175     card_table->scavenge_contents(_gen->start_array(),
 176                                   _gen->object_space(),
 177                                   _gen_top,
 178                                   pm);
 179 
 180     // Do the real work
 181     pm->drain_stacks(false);
 182   }
 183 }
 184 
 185 //
 186 // OldToYoungRootsTask
 187 //
 188 
 189 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
 190   assert(_gen != NULL, "Sanity");
 191   assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
 192   assert(_stripe_number < ParallelGCThreads, "Sanity");
 193 
 194   {
 195     PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
 196 
 197     assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
 198     CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
 199     // FIX ME! Assert that card_table is the type we believe it to be.
 200 
 201     card_table->scavenge_contents_parallel(_gen->start_array(),
 202                                            _gen->object_space(),
 203                                            _gen_top,
 204                                            pm,
 205                                            _stripe_number);
 206 
 207     // Do the real work
 208     pm->drain_stacks(false);
 209   }
 210 }