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/psCardTable.hpp"
32 #include "gc/parallel/psClosure.inline.hpp"
33 #include "gc/parallel/psPromotionManager.hpp"
34 #include "gc/parallel/psPromotionManager.inline.hpp"
35 #include "gc/parallel/psScavenge.inline.hpp"
36 #include "gc/parallel/psTasks.hpp"
37 #include "gc/shared/taskqueue.inline.hpp"
38 #include "memory/iterator.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/thread.hpp"
43 #include "runtime/vmThread.hpp"
44 #include "services/management.hpp"
45
46 //
47 // ScavengeRootsTask
48 //
49
50 void 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 system_dictionary:
78 SystemDictionary::oops_do(&roots_closure);
79 break;
80
81 case class_loader_data:
82 {
83 PSScavengeCLDClosure cld_closure(pm);
84 ClassLoaderDataGraph::cld_do(&cld_closure);
85 }
86 break;
87
88 case management:
89 Management::oops_do(&roots_closure);
90 break;
91
92 case jvmti:
93 JvmtiExport::oops_do(&roots_closure);
94 break;
95
96
97 case code_cache:
98 {
99 MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations);
100 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
101 AOTLoader::oops_do(&roots_closure);
102 }
103 break;
104
105 default:
106 fatal("Unknown root type");
107 }
108
109 // Do the real work
110 pm->drain_stacks(false);
111 }
112
113 //
114 // ThreadRootsTask
115 //
116
117 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
118 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
119
120 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
121 PSScavengeRootsClosure roots_closure(pm);
122 MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations);
123
124 _thread->oops_do(&roots_closure, &roots_in_blobs);
125
126 // Do the real work
127 pm->drain_stacks(false);
128 }
129
130 //
131 // StealTask
132 //
133
134 StealTask::StealTask(ParallelTaskTerminator* t) :
135 _terminator(t) {}
136
137 void StealTask::do_it(GCTaskManager* manager, uint which) {
138 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
139
140 PSPromotionManager* pm =
141 PSPromotionManager::gc_thread_promotion_manager(which);
142 pm->drain_stacks(true);
143 guarantee(pm->stacks_empty(),
144 "stacks should be empty at this point");
145
146 while(true) {
147 StarTask p;
148 if (PSPromotionManager::steal_depth(which, 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 // OldToYoungRootsTask
163 //
164
165 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
166 // There are not old-to-young pointers if the old gen is empty.
167 assert(!_old_gen->object_space()->is_empty(),
168 "Should not be called is there is no work");
169 assert(_old_gen != NULL, "Sanity");
170 assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity");
171 assert(_stripe_number < ParallelGCThreads, "Sanity");
172
173 {
174 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
175 PSCardTable* card_table = ParallelScavengeHeap::heap()->card_table();
176
177 card_table->scavenge_contents_parallel(_old_gen->start_array(),
178 _old_gen->object_space(),
179 _gen_top,
180 pm,
181 _stripe_number,
182 _stripe_total);
183
184 // Do the real work
185 pm->drain_stacks(false);
186 }
187 }