1 /*
2 * Copyright (c) 2002, 2012, 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_implementation/parallelScavenge/cardTableExtension.hpp"
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
30 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp"
31 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
32 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
33 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
34 #include "gc_implementation/parallelScavenge/psTasks.hpp"
35 #include "memory/iterator.hpp"
36 #include "memory/universe.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "oops/oop.psgc.inline.hpp"
39 #include "runtime/fprofiler.hpp"
40 #include "runtime/thread.hpp"
41 #include "runtime/vmThread.hpp"
42 #include "services/management.hpp"
43 #include "utilities/taskqueue.hpp"
44
45 //
46 // ScavengeRootsTask
47 //
48
49 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) {
50 assert(Universe::heap()->is_gc_active(), "called outside gc");
51
52 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
53 PSScavengeRootsClosure</*promote_immediately=*/false> roots_closure(pm);
54 PSScavengeRootsClosure</*promote_immediately=*/true> 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 management:
85 Management::oops_do(&roots_closure);
86 break;
87
88 case jvmti:
89 JvmtiExport::oops_do(&roots_closure);
90 break;
91
92
93 case code_cache:
94 {
95 CodeBlobToOopClosure each_scavengable_code_blob(&roots_to_old_closure, /*do_marking=*/ true);
96 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob);
97 }
98 break;
99
100 default:
101 fatal("Unknown root type");
102 }
103
104 // Do the real work
105 pm->drain_stacks(false);
106 }
107
108 //
109 // ThreadRootsTask
110 //
111
112 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) {
113 assert(Universe::heap()->is_gc_active(), "called outside gc");
114
115 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
116 PSScavengeRootsClosure</*promote_immediately=*/false> roots_closure(pm);
117 CodeBlobToOopClosure roots_in_blobs(&roots_closure, /*do_marking=*/ true);
118
119 if (_java_thread != NULL)
120 _java_thread->oops_do(&roots_closure, &roots_in_blobs);
121
122 if (_vm_thread != NULL)
123 _vm_thread->oops_do(&roots_closure, &roots_in_blobs);
124
125 // Do the real work
126 pm->drain_stacks(false);
127 }
128
129 //
130 // StealTask
131 //
132
133 StealTask::StealTask(ParallelTaskTerminator* t) :
134 _terminator(t) {}
135
136 void StealTask::do_it(GCTaskManager* manager, uint which) {
137 assert(Universe::heap()->is_gc_active(), "called outside gc");
138
139 PSPromotionManager* pm =
140 PSPromotionManager::gc_thread_promotion_manager(which);
141 pm->drain_stacks(true);
142 guarantee(pm->stacks_empty(),
143 "stacks should be empty at this point");
144
145 int random_seed = 17;
146 while(true) {
147 StarTask p;
148 if (PSPromotionManager::steal_depth(which, &random_seed, 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 // SerialOldToYoungRootsTask
163 //
164
165 void SerialOldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
166 assert(_gen != NULL, "Sanity");
167 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
168
169 {
170 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
171
172 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
173 CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
174 // FIX ME! Assert that card_table is the type we believe it to be.
175
176 card_table->scavenge_contents(_gen->start_array(),
177 _gen->object_space(),
178 _gen_top,
179 pm);
180
181 // Do the real work
182 pm->drain_stacks(false);
183 }
184 }
185
186 //
187 // OldToYoungRootsTask
188 //
189
190 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) {
191 assert(_gen != NULL, "Sanity");
192 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity");
193 assert(_stripe_number < ParallelGCThreads, "Sanity");
194
195 {
196 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which);
197
198 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
199 CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set();
200 // FIX ME! Assert that card_table is the type we believe it to be.
201
202 card_table->scavenge_contents_parallel(_gen->start_array(),
203 _gen->object_space(),
204 _gen_top,
205 pm,
206 _stripe_number,
207 _stripe_total);
208
209 // Do the real work
210 pm->drain_stacks(false);
211 }
212 }