1 /*
2 * Copyright (c) 2002, 2019, 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 #if INCLUDE_JVMCI
48 #include "jvmci/jvmci.hpp"
49 #endif
50
51 //
52 // ScavengeRootsTask
53 //
54
do_it(GCTaskManager * manager,uint which)55 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
56 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
57
58 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
59 PSScavengeRootsClosure roots_closure(pm);
60 PSPromoteRootsClosure roots_to_old_closure(pm);
61
62 switch (_root_type) {
63 case universe:
64 Universe::oops_do(&roots_closure);
65 break;
66
67 case jni_handles:
68 JNIHandles::oops_do(&roots_closure);
69 break;
70
71 case threads:
72 {
73 ResourceMark rm;
74 Threads::oops_do(&roots_closure, NULL);
75 }
76 break;
77
78 case object_synchronizer:
79 ObjectSynchronizer::oops_do(&roots_closure);
80 break;
81
82 case system_dictionary:
83 SystemDictionary::oops_do(&roots_closure);
84 break;
85
86 case class_loader_data:
87 {
88 PSScavengeCLDClosure cld_closure(pm);
89 ClassLoaderDataGraph::cld_do(&cld_closure);
90 }
91 break;
92
93 case management:
94 Management::oops_do(&roots_closure);
95 break;
96
97 case jvmti:
98 JvmtiExport::oops_do(&roots_closure);
99 break;
100
101 case code_cache:
102 {
103 MarkingCodeBlobClosure code_closure(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations);
104 ScavengableNMethods::nmethods_do(&code_closure);
105 AOTLoader::oops_do(&roots_closure);
106 }
107 break;
108
109 #if INCLUDE_JVMCI
110 case jvmci:
111 JVMCI::oops_do(&roots_closure);
112 break;
113 #endif
114
115 default:
116 fatal("Unknown root type");
117 }
118
119 // Do the real work
120 pm->drain_stacks(false);
121 }
122
123 //
124 // ThreadRootsTask
125 //
126
do_it(GCTaskManager * manager,uint which)127 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
128 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
129
130 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
131 PSScavengeRootsClosure roots_closure(pm);
132 MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations);
133
134 _thread->oops_do(&roots_closure, &roots_in_blobs);
135
136 // Do the real work
137 pm->drain_stacks(false);
138 }
139
140 //
141 // StealTask
142 //
143
StealTask(ParallelTaskTerminator * t)144 StealTask::StealTask(ParallelTaskTerminator* t) :
145 _terminator(t) {}
146
do_it(GCTaskManager * manager,uint which)147 void StealTask::do_it(GCTaskManager* manager, uint which) {
148 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
149
150 PSPromotionManager* pm =
151 PSPromotionManager::gc_thread_promotion_manager(which);
152 pm->drain_stacks(true);
153 guarantee(pm->stacks_empty(),
154 "stacks should be empty at this point");
155
156 while(true) {
157 StarTask p;
158 if (PSPromotionManager::steal_depth(which, p)) {
159 TASKQUEUE_STATS_ONLY(pm->record_steal(p));
160 pm->process_popped_location_depth(p);
161 pm->drain_stacks_depth(true);
162 } else {
163 if (terminator()->offer_termination()) {
164 break;
165 }
166 }
167 }
168 guarantee(pm->stacks_empty(), "stacks should be empty at this point");
169 }
170
171 //
172 // OldToYoungRootsTask
173 //
174
do_it(GCTaskManager * manager,uint which)175 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
176 // There are not old-to-young pointers if the old gen is empty.
177 assert(!_old_gen->object_space()->is_empty(),
178 "Should not be called is there is no work");
179 assert(_old_gen != NULL, "Sanity");
180 assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity");
181 assert(_stripe_number < ParallelGCThreads, "Sanity");
182
183 {
184 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
185 PSCardTable* card_table = ParallelScavengeHeap::heap()->card_table();
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