1/*
2 * Copyright (c) 2002, 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/cardTableExtension.hpp"
30#include "gc/parallel/gcTaskManager.hpp"
31#include "gc/parallel/psMarkSweep.hpp"
32#include "gc/parallel/psPromotionManager.hpp"
33#include "gc/parallel/psPromotionManager.inline.hpp"
34#include "gc/parallel/psScavenge.inline.hpp"
35#include "gc/parallel/psTasks.hpp"
36#include "gc/shared/taskqueue.inline.hpp"
37#include "memory/iterator.hpp"
38#include "memory/resourceArea.hpp"
39#include "memory/universe.hpp"
40#include "oops/oop.inline.hpp"
41#include "runtime/fprofiler.hpp"
42#include "runtime/thread.hpp"
43#include "runtime/vmThread.hpp"
44#include "services/management.hpp"
45
46//
47// ScavengeRootsTask
48//
49
50void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
51  assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
52
53  PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
54  PSScavengeRootsClosure roots_closure(pm);
55  PSPromoteRootsClosure  roots_to_old_closure(pm);
56
57  switch (_root_type) {
58    case universe:
59      Universe::oops_do(&roots_closure);
60      break;
61
62    case jni_handles:
63      JNIHandles::oops_do(&roots_closure);
64      break;
65
66    case threads:
67    {
68      ResourceMark rm;
69      Threads::oops_do(&roots_closure, NULL);
70    }
71    break;
72
73    case object_synchronizer:
74      ObjectSynchronizer::oops_do(&roots_closure);
75      break;
76
77    case flat_profiler:
78      FlatProfiler::oops_do(&roots_closure);
79      break;
80
81    case system_dictionary:
82      SystemDictionary::oops_do(&roots_closure);
83      break;
84
85    case class_loader_data:
86    {
87      PSScavengeKlassClosure klass_closure(pm);
88      ClassLoaderDataGraph::oops_do(&roots_closure, &klass_closure, false);
89    }
90    break;
91
92    case management:
93      Management::oops_do(&roots_closure);
94      break;
95
96    case jvmti:
97      JvmtiExport::oops_do(&roots_closure);
98      break;
99
100
101    case code_cache:
102      {
103        MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations);
104        CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
105        AOTLoader::oops_do(&roots_closure);
106      }
107      break;
108
109    default:
110      fatal("Unknown root type");
111  }
112
113  // Do the real work
114  pm->drain_stacks(false);
115}
116
117//
118// ThreadRootsTask
119//
120
121void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
122  assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
123
124  PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
125  PSScavengeRootsClosure roots_closure(pm);
126  MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations);
127
128  if (_java_thread != NULL)
129    _java_thread->oops_do(&roots_closure, &roots_in_blobs);
130
131  if (_vm_thread != NULL)
132    _vm_thread->oops_do(&roots_closure, &roots_in_blobs);
133
134  // Do the real work
135  pm->drain_stacks(false);
136}
137
138//
139// StealTask
140//
141
142StealTask::StealTask(ParallelTaskTerminator* t) :
143  _terminator(t) {}
144
145void StealTask::do_it(GCTaskManager* manager, uint which) {
146  assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
147
148  PSPromotionManager* pm =
149    PSPromotionManager::gc_thread_promotion_manager(which);
150  pm->drain_stacks(true);
151  guarantee(pm->stacks_empty(),
152            "stacks should be empty at this point");
153
154  int random_seed = 17;
155  while(true) {
156    StarTask p;
157    if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
158      TASKQUEUE_STATS_ONLY(pm->record_steal(p));
159      pm->process_popped_location_depth(p);
160      pm->drain_stacks_depth(true);
161    } else {
162      if (terminator()->offer_termination()) {
163        break;
164      }
165    }
166  }
167  guarantee(pm->stacks_empty(), "stacks should be empty at this point");
168}
169
170//
171// OldToYoungRootsTask
172//
173
174void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
175  // There are not old-to-young pointers if the old gen is empty.
176  assert(!_old_gen->object_space()->is_empty(),
177    "Should not be called is there is no work");
178  assert(_old_gen != NULL, "Sanity");
179  assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity");
180  assert(_stripe_number < ParallelGCThreads, "Sanity");
181
182  {
183    PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
184    CardTableExtension* card_table =
185      barrier_set_cast<CardTableExtension>(ParallelScavengeHeap::heap()->barrier_set());
186
187    card_table->scavenge_contents_parallel(_old_gen->start_array(),
188                                           _old_gen->object_space(),
189                                           _gen_top,
190                                           pm,
191                                           _stripe_number,
192                                           _stripe_total);
193
194    // Do the real work
195    pm->drain_stacks(false);
196  }
197}
198