1 /*
2 * Copyright (c) 2002, 2017, 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/thread.hpp"
42 #include "runtime/vmThread.hpp"
43 #include "services/management.hpp"
44
45 //
46 // ScavengeRootsTask
47 //
48
49 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
50 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
51
52 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
53 PSScavengeRootsClosure roots_closure(pm);
54 PSPromoteRootsClosure roots_to_old_closure(pm);
55
56 switch (_root_type) {
57 case universe:
58 Universe::oops_do(&roots_closure);
59 break;
60
61 case jni_handles:
62 JNIHandles::oops_do(&roots_closure);
63 break;
64
65 case threads:
66 {
67 ResourceMark rm;
68 Threads::oops_do(&roots_closure, NULL);
69 }
70 break;
71
72 case object_synchronizer:
73 ObjectSynchronizer::oops_do(&roots_closure);
74 break;
75
76 case system_dictionary:
77 SystemDictionary::oops_do(&roots_closure);
78 break;
79
80 case class_loader_data:
81 {
82 PSScavengeCLDClosure ps(pm);
83 ClassLoaderDataGraph::cld_do(&ps);
84 }
85 break;
86
87 case management:
88 Management::oops_do(&roots_closure);
89 break;
90
91 case jvmti:
92 JvmtiExport::oops_do(&roots_closure);
93 break;
94
95
96 case code_cache:
97 {
98 MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations);
99 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
100 AOTLoader::oops_do(&roots_closure);
101 }
102 break;
103
104 default:
105 fatal("Unknown root type");
106 }
107
108 // Do the real work
109 pm->drain_stacks(false);
110 }
111
112 //
113 // ThreadRootsTask
114 //
115
116 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
117 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
118
119 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
120 PSScavengeRootsClosure roots_closure(pm);
121 MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations);
122
123 if (_java_thread != NULL)
124 _java_thread->oops_do(&roots_closure, &roots_in_blobs);
125
126 if (_vm_thread != NULL)
127 _vm_thread->oops_do(&roots_closure, &roots_in_blobs);
128
129 // Do the real work
130 pm->drain_stacks(false);
131 }
132
133 //
134 // StealTask
135 //
136
137 StealTask::StealTask(ParallelTaskTerminator* t) :
138 _terminator(t) {}
139
140 void StealTask::do_it(GCTaskManager* manager, uint which) {
141 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
142
143 PSPromotionManager* pm =
144 PSPromotionManager::gc_thread_promotion_manager(which);
145 pm->drain_stacks(true);
146 guarantee(pm->stacks_empty(),
147 "stacks should be empty at this point");
148
149 int random_seed = 17;
150 while(true) {
151 StarTask p;
152 if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
153 TASKQUEUE_STATS_ONLY(pm->record_steal(p));
154 pm->process_popped_location_depth(p);
155 pm->drain_stacks_depth(true);
156 } else {
157 if (terminator()->offer_termination()) {
158 break;
159 }
160 }
161 }
162 guarantee(pm->stacks_empty(), "stacks should be empty at this point");
163 }
164
165 //
166 // OldToYoungRootsTask
167 //
168
169 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
170 // There are not old-to-young pointers if the old gen is empty.
171 assert(!_old_gen->object_space()->is_empty(),
172 "Should not be called is there is no work");
173 assert(_old_gen != NULL, "Sanity");
174 assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity");
175 assert(_stripe_number < ParallelGCThreads, "Sanity");
176
177 {
178 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
179 CardTableExtension* card_table =
180 barrier_set_cast<CardTableExtension>(ParallelScavengeHeap::heap()->barrier_set());
181
182 card_table->scavenge_contents_parallel(_old_gen->start_array(),
183 _old_gen->object_space(),
184 _gen_top,
185 pm,
186 _stripe_number,
187 _stripe_total);
188
189 // Do the real work
190 pm->drain_stacks(false);
191 }
192 }