1 /*
2 * Copyright (c) 2002, 2016, 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 "classfile/systemDictionary.hpp"
27 #include "code/codeCache.hpp"
28 #include "gc/parallel/cardTableExtension.hpp"
29 #include "gc/parallel/gcTaskManager.hpp"
30 #include "gc/parallel/psMarkSweep.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/fprofiler.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 flat_profiler:
77 FlatProfiler::oops_do(&roots_closure);
78 break;
79
80 case system_dictionary:
81 SystemDictionary::oops_do(&roots_closure);
82 break;
83
84 case class_loader_data:
85 {
86 PSScavengeKlassClosure klass_closure(pm);
87 ClassLoaderDataGraph::oops_do(&roots_closure, &klass_closure, false);
88 }
89 break;
90
91 case management:
92 Management::oops_do(&roots_closure);
93 break;
94
95 case jvmti:
96 JvmtiExport::oops_do(&roots_closure);
97 break;
98
99
100 case code_cache:
101 {
102 MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations);
103 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
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 if (_java_thread != NULL)
127 _java_thread->oops_do(&roots_closure, &roots_in_blobs);
128
129 if (_vm_thread != NULL)
130 _vm_thread->oops_do(&roots_closure, &roots_in_blobs);
131
132 // Do the real work
133 pm->drain_stacks(false);
134 }
135
136 //
137 // StealTask
138 //
139
140 StealTask::StealTask(ParallelTaskTerminator* t) :
141 _terminator(t) {}
142
143 void StealTask::do_it(GCTaskManager* manager, uint which) {
144 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
145
146 PSPromotionManager* pm =
147 PSPromotionManager::gc_thread_promotion_manager(which);
148 pm->drain_stacks(true);
149 guarantee(pm->stacks_empty(),
150 "stacks should be empty at this point");
151
152 int random_seed = 17;
153 while(true) {
154 StarTask p;
155 if (PSPromotionManager::steal_depth(which, &random_seed, p)) {
156 TASKQUEUE_STATS_ONLY(pm->record_steal(p));
157 pm->process_popped_location_depth(p);
158 pm->drain_stacks_depth(true);
159 } else {
160 if (terminator()->offer_termination()) {
161 break;
162 }
163 }
164 }
165 guarantee(pm->stacks_empty(), "stacks should be empty at this point");
166 }
167
168 //
169 // OldToYoungRootsTask
170 //
171
172 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
173 // There are not old-to-young pointers if the old gen is empty.
174 assert(!_old_gen->object_space()->is_empty(),
175 "Should not be called is there is no work");
176 assert(_old_gen != NULL, "Sanity");
177 assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity");
178 assert(_stripe_number < ParallelGCThreads, "Sanity");
179
180 {
181 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
182 CardTableExtension* card_table =
183 barrier_set_cast<CardTableExtension>(ParallelScavengeHeap::heap()->barrier_set());
184
185 card_table->scavenge_contents_parallel(_old_gen->start_array(),
186 _old_gen->object_space(),
187 _gen_top,
188 pm,
189 _stripe_number,
190 _stripe_total);
191
192 // Do the real work
193 pm->drain_stacks(false);
194 }
195 }