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/systemDictionary.hpp"
28 #include "code/codeCache.hpp"
29 #include "gc/parallel/gcTaskManager.hpp"
30 #include "gc/parallel/psCardTable.hpp"
31 #include "gc/parallel/psPromotionManager.hpp"
32 #include "gc/parallel/psPromotionManager.inline.hpp"
33 #include "gc/parallel/psScavenge.inline.hpp"
34 #include "gc/parallel/psTasks.hpp"
35 #include "gc/shared/taskqueue.inline.hpp"
36 #include "memory/iterator.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "memory/universe.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "runtime/thread.hpp"
41 #include "runtime/vmThread.hpp"
42 #include "services/management.hpp"
43
44 //
45 // ScavengeRootsTask
46 //
47
48 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
49 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
50
51 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
52 PSScavengeRootsClosure roots_closure(pm);
53 PSPromoteRootsClosure roots_to_old_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 system_dictionary:
76 SystemDictionary::oops_do(&roots_closure);
77 break;
78
79 case class_loader_data:
80 {
81 PSScavengeCLDClosure cld_closure(pm);
82 ClassLoaderDataGraph::cld_do(&cld_closure);
83 }
84 break;
85
86 case management:
87 Management::oops_do(&roots_closure);
88 break;
89
90 case jvmti:
91 JvmtiExport::oops_do(&roots_closure);
92 break;
93
94
95 case code_cache:
96 {
97 MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations);
98 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
99 AOTLoader::oops_do(&roots_closure);
100 }
101 break;
102
103 default:
104 fatal("Unknown root type");
105 }
106
107 // Do the real work
108 pm->drain_stacks(false);
109 }
110
111 //
112 // ThreadRootsTask
113 //
114
115 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
116 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
117
118 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
119 PSScavengeRootsClosure roots_closure(pm);
120 MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations);
121
122 if (_java_thread != NULL)
123 _java_thread->oops_do(&roots_closure, &roots_in_blobs);
124
125 if (_vm_thread != NULL)
126 _vm_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 int random_seed = 17;
149 while(true) {
150 StarTask p;
151 if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
152 TASKQUEUE_STATS_ONLY(pm->record_steal(p));
153 pm->process_popped_location_depth(p);
154 pm->drain_stacks_depth(true);
155 } else {
156 if (terminator()->offer_termination()) {
157 break;
158 }
159 }
160 }
161 guarantee(pm->stacks_empty(), "stacks should be empty at this point");
162 }
163
164 //
165 // OldToYoungRootsTask
166 //
167
168 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
169 // There are not old-to-young pointers if the old gen is empty.
170 assert(!_old_gen->object_space()->is_empty(),
171 "Should not be called is there is no work");
172 assert(_old_gen != NULL, "Sanity");
173 assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity");
174 assert(_stripe_number < ParallelGCThreads, "Sanity");
175
176 {
177 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
178 PSCardTable* card_table = ParallelScavengeHeap::heap()->card_table();
179
180 card_table->scavenge_contents_parallel(_old_gen->start_array(),
181 _old_gen->object_space(),
182 _gen_top,
183 pm,
184 _stripe_number,
185 _stripe_total);
186
187 // Do the real work
188 pm->drain_stacks(false);
189 }
190 }