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       ReferenceProcessor::oops_do(&roots_closure);
  59       break;
  60 
  61     case jni_handles:
  62       JNIHandles::oops_do(&roots_closure);
  63       break;
  64 
  65     case threads:
  66     {
  67       ResourceMark rm;
  68       Threads::oops_do(&roots_closure, NULL);
  69     }
  70     break;
  71 
  72     case object_synchronizer:
  73       ObjectSynchronizer::oops_do(&roots_closure);
  74       break;
  75 
  76     case flat_profiler:
  77       FlatProfiler::oops_do(&roots_closure);
  78       break;
  79 
  80     case system_dictionary:
  81       SystemDictionary::oops_do(&roots_closure);
  82       break;
  83 
  84     case management:
  85       Management::oops_do(&roots_closure);
  86       break;
  87 
  88     case jvmti:
  89       JvmtiExport::oops_do(&roots_closure);
  90       break;
  91 
  92 
  93     case code_cache:
  94       {
  95         CodeBlobToOopClosure each_scavengable_code_blob(&roots_closure, /*do_marking=*/ true);
  96         CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
  97       }
  98       break;
  99 
 100     default:
 101       fatal("Unknown root type");
 102   }
 103 
 104   // Do the real work
 105   pm->drain_stacks(false);
 106 }
 107 
 108 //
 109 // ThreadRootsTask
 110 //
 111 
 112 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
 113   assert(Universe::heap()->is_gc_active(), "called outside gc");
 114 
 115   PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
 116   PSScavengeRootsClosure roots_closure(pm);
 117   CodeBlobToOopClosure roots_in_blobs(&roots_closure, /*do_marking=*/ true);
 118 
 119   if (_java_thread != NULL)
 120     _java_thread->oops_do(&roots_closure, &roots_in_blobs);
 121 
 122   if (_vm_thread != NULL)
 123     _vm_thread->oops_do(&roots_closure, &roots_in_blobs);
 124 
 125   // Do the real work
 126   pm->drain_stacks(false);
 127 }
 128 
 129 //
 130 // StealTask
 131 //
 132 
 133 StealTask::StealTask(ParallelTaskTerminator* t) :
 134   _terminator(t) {}
 135 
 136 void StealTask::do_it(GCTaskManager* manager, uint which) {
 137   assert(Universe::heap()->is_gc_active(), "called outside gc");
 138 
 139   PSPromotionManager* pm =
 140     PSPromotionManager::gc_thread_promotion_manager(which);
 141   pm->drain_stacks(true);
 142   guarantee(pm->stacks_empty(),
 143             "stacks should be empty at this point");
 144 
 145   int random_seed = 17;
 146   while(true) {
 147     StarTask p;
 148     if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
 149       TASKQUEUE_STATS_ONLY(pm->record_steal(p));
 150       pm->process_popped_location_depth(p);
 151       pm->drain_stacks_depth(true);
 152     } else {
 153       if (terminator()->offer_termination()) {
 154         break;
 155       }
 156     }
 157   }
 158   guarantee(pm->stacks_empty(), "stacks should be empty at this point");
 159 }
 160 
 161 //
 162 // SerialOldToYoungRootsTask
 163 //
 164 
 165 void SerialOldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
 166   assert(_gen != NULL, "Sanity");
 167   assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
 168 
 169   {
 170     PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
 171 
 172     assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
 173     CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
 174     // FIX ME! Assert that card_table is the type we believe it to be.
 175 
 176     card_table->scavenge_contents(_gen->start_array(),
 177                                   _gen->object_space(),
 178                                   _gen_top,
 179                                   pm);
 180 
 181     // Do the real work
 182     pm->drain_stacks(false);
 183   }
 184 }
 185 
 186 //
 187 // OldToYoungRootsTask
 188 //
 189 
 190 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
 191   assert(_gen != NULL, "Sanity");
 192   assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
 193   assert(_stripe_number < ParallelGCThreads, "Sanity");
 194 
 195   {
 196     PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
 197 
 198     assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
 199     CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
 200     // FIX ME! Assert that card_table is the type we believe it to be.
 201 
 202     card_table->scavenge_contents_parallel(_gen->start_array(),
 203                                            _gen->object_space(),
 204                                            _gen_top,
 205                                            pm,
 206                                            _stripe_number);
 207 
 208     // Do the real work
 209     pm->drain_stacks(false);
 210   }
 211 }