1 /*
2 * Copyright (c) 2002, 2018, 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/classLoaderDataGraph.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "code/codeCache.hpp"
30 #include "gc/parallel/gcTaskManager.hpp"
31 #include "gc/parallel/parallelScavengeHeap.inline.hpp"
32 #include "gc/parallel/psCardTable.hpp"
33 #include "gc/parallel/psClosure.inline.hpp"
34 #include "gc/parallel/psPromotionManager.hpp"
35 #include "gc/parallel/psPromotionManager.inline.hpp"
36 #include "gc/parallel/psScavenge.inline.hpp"
37 #include "gc/parallel/psTasks.hpp"
38 #include "gc/shared/scavengableNMethods.hpp"
39 #include "gc/shared/taskqueue.inline.hpp"
40 #include "memory/iterator.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "runtime/thread.hpp"
45 #include "runtime/vmThread.hpp"
46 #include "services/management.hpp"
47
48 //
49 // ScavengeRootsTask
50 //
51
52 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
53 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
54
55 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
56 PSScavengeRootsClosure roots_closure(pm);
57 PSPromoteRootsClosure roots_to_old_closure(pm);
58
59 switch (_root_type) {
60 case universe:
61 Universe::oops_do(&roots_closure);
62 break;
63
64 case jni_handles:
65 JNIHandles::oops_do(&roots_closure);
66 break;
67
68 case threads:
69 {
70 ResourceMark rm;
71 Threads::oops_do(&roots_closure, NULL);
72 }
73 break;
74
75 case object_synchronizer:
76 ObjectSynchronizer::oops_do(&roots_closure);
77 break;
78
79 case system_dictionary:
80 SystemDictionary::oops_do(&roots_closure);
81 break;
82
83 case class_loader_data:
84 {
85 PSScavengeCLDClosure cld_closure(pm);
86 ClassLoaderDataGraph::cld_do(&cld_closure);
87 }
88 break;
89
90 case management:
91 Management::oops_do(&roots_closure);
92 break;
93
94 case jvmti:
95 JvmtiExport::oops_do(&roots_closure);
96 break;
97
98
99 case code_cache:
100 {
101 MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations);
102 ScavengableNMethods::scavengable_nmethods_do(&each_scavengable_code_blob);
103 AOTLoader::oops_do(&roots_closure);
104 }
105 break;
106
107 default:
108 fatal("Unknown root type");
109 }
110
111 // Do the real work
112 pm->drain_stacks(false);
113 }
114
115 //
116 // ThreadRootsTask
117 //
118
119 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
120 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
121
122 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
123 PSScavengeRootsClosure roots_closure(pm);
124 MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations);
125
126 _thread->oops_do(&roots_closure, &roots_in_blobs);
127
128 // Do the real work
129 pm->drain_stacks(false);
130 }
131
132 //
133 // StealTask
134 //
135
136 StealTask::StealTask(ParallelTaskTerminator* t) :
137 _terminator(t) {}
138
139 void StealTask::do_it(GCTaskManager* manager, uint which) {
140 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
141
142 PSPromotionManager* pm =
143 PSPromotionManager::gc_thread_promotion_manager(which);
144 pm->drain_stacks(true);
145 guarantee(pm->stacks_empty(),
146 "stacks should be empty at this point");
147
148 while(true) {
149 StarTask p;
150 if (PSPromotionManager::steal_depth(which, p)) {
151 TASKQUEUE_STATS_ONLY(pm->record_steal(p));
152 pm->process_popped_location_depth(p);
153 pm->drain_stacks_depth(true);
154 } else {
155 if (terminator()->offer_termination()) {
156 break;
157 }
158 }
159 }
160 guarantee(pm->stacks_empty(), "stacks should be empty at this point");
161 }
162
163 //
164 // OldToYoungRootsTask
165 //
166
167 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
168 // There are not old-to-young pointers if the old gen is empty.
169 assert(!_old_gen->object_space()->is_empty(),
170 "Should not be called is there is no work");
171 assert(_old_gen != NULL, "Sanity");
172 assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity");
173 assert(_stripe_number < ParallelGCThreads, "Sanity");
174
175 {
176 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
177 PSCardTable* card_table = ParallelScavengeHeap::heap()->card_table();
178
179 card_table->scavenge_contents_parallel(_old_gen->start_array(),
180 _old_gen->object_space(),
181 _gen_top,
182 pm,
183 _stripe_number,
184 _stripe_total);
185
186 // Do the real work
187 pm->drain_stacks(false);
188 }
189 }