1 /*
2 * Copyright (c) 2005, 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/parallelScavengeHeap.hpp"
29 #include "gc/parallel/pcTasks.hpp"
30 #include "gc/parallel/psCompactionManager.inline.hpp"
31 #include "gc/parallel/psParallelCompact.hpp"
32 #include "gc/shared/collectedHeap.hpp"
33 #include "gc/shared/gcTimer.hpp"
34 #include "gc/shared/gcTraceTime.inline.hpp"
35 #include "logging/log.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "memory/universe.hpp"
38 #include "oops/objArrayKlass.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiExport.hpp"
41 #include "runtime/fprofiler.hpp"
42 #include "runtime/jniHandles.hpp"
43 #include "runtime/thread.hpp"
44 #include "runtime/vmThread.hpp"
45 #include "services/management.hpp"
46 #include "utilities/stack.inline.hpp"
47
48 //
49 // ThreadRootsMarkingTask
50 //
51
52 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
53 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
54
55 ResourceMark rm;
56
57 ParCompactionManager* cm =
58 ParCompactionManager::gc_thread_compaction_manager(which);
59
60 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
61 MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
62
63 if (_java_thread != NULL)
64 _java_thread->oops_do(
65 &mark_and_push_closure,
66 &mark_and_push_in_blobs);
67
68 if (_vm_thread != NULL)
69 _vm_thread->oops_do(
70 &mark_and_push_closure,
71 &mark_and_push_in_blobs);
72
73 // Do the real work
74 cm->follow_marking_stacks();
75 }
76
77
78 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
79 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
80
81 ParCompactionManager* cm =
82 ParCompactionManager::gc_thread_compaction_manager(which);
83 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
84 ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);
85
86 switch (_root_type) {
87 case universe:
88 Universe::oops_do(&mark_and_push_closure);
89 break;
90
91 case jni_handles:
92 JNIHandles::oops_do(&mark_and_push_closure);
93 break;
94
95 case threads:
96 {
97 ResourceMark rm;
98 MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
99 Threads::oops_do(&mark_and_push_closure, &each_active_code_blob);
100 }
101 break;
102
103 case object_synchronizer:
104 ObjectSynchronizer::oops_do(&mark_and_push_closure);
105 break;
106
107 case flat_profiler:
108 FlatProfiler::oops_do(&mark_and_push_closure);
109 break;
110
111 case management:
112 Management::oops_do(&mark_and_push_closure);
113 break;
114
115 case jvmti:
116 JvmtiExport::oops_do(&mark_and_push_closure);
117 break;
118
119 case system_dictionary:
120 SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
121 break;
122
123 case class_loader_data:
124 ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);
125 break;
126
127 case code_cache:
128 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
129 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
130 break;
131
132 default:
133 fatal("Unknown root type");
134 }
135
136 // Do the real work
137 cm->follow_marking_stacks();
138 }
139
140
141 //
142 // RefProcTaskProxy
143 //
144
145 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
146 {
147 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
148
149 ParCompactionManager* cm =
150 ParCompactionManager::gc_thread_compaction_manager(which);
151 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
152 ParCompactionManager::FollowStackClosure follow_stack_closure(cm);
153 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
154 mark_and_push_closure, follow_stack_closure);
155 }
156
157 //
158 // RefProcTaskExecutor
159 //
160
161 void RefProcTaskExecutor::execute(ProcessTask& task)
162 {
163 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
164 uint parallel_gc_threads = heap->gc_task_manager()->workers();
165 uint active_gc_threads = heap->gc_task_manager()->active_workers();
166 OopTaskQueueSet* qset = ParCompactionManager::stack_array();
167 ParallelTaskTerminator terminator(active_gc_threads, qset);
168 GCTaskQueue* q = GCTaskQueue::create();
169 for(uint i=0; i<parallel_gc_threads; i++) {
170 q->enqueue(new RefProcTaskProxy(task, i));
171 }
172 if (task.marks_oops_alive()) {
173 if (parallel_gc_threads>1) {
174 for (uint j=0; j<active_gc_threads; j++) {
175 q->enqueue(new StealMarkingTask(&terminator));
176 }
177 }
178 }
179 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
180 }
181
182 void RefProcTaskExecutor::execute(EnqueueTask& task)
183 {
184 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
185 uint parallel_gc_threads = heap->gc_task_manager()->workers();
186 GCTaskQueue* q = GCTaskQueue::create();
187 for(uint i=0; i<parallel_gc_threads; i++) {
188 q->enqueue(new RefEnqueueTaskProxy(task, i));
189 }
190 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
191 }
192
193 //
194 // StealMarkingTask
195 //
196
197 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
198 _terminator(t) {}
199
200 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
201 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
202
203 ParCompactionManager* cm =
204 ParCompactionManager::gc_thread_compaction_manager(which);
205 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
206
207 oop obj = NULL;
208 ObjArrayTask task;
209 int random_seed = 17;
210 do {
211 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
212 cm->follow_contents((objArrayOop)task.obj(), task.index());
213 cm->follow_marking_stacks();
214 }
215 while (ParCompactionManager::steal(which, &random_seed, obj)) {
216 cm->follow_contents(obj);
217 cm->follow_marking_stacks();
218 }
219 } while (!terminator()->offer_termination());
220 }
221
222 //
223 // CompactionWithStealingTask
224 //
225
226 CompactionWithStealingTask::CompactionWithStealingTask(ParallelTaskTerminator* t):
227 _terminator(t) {}
228
229 void CompactionWithStealingTask::do_it(GCTaskManager* manager, uint which) {
230 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
231
232 ParCompactionManager* cm =
233 ParCompactionManager::gc_thread_compaction_manager(which);
234
235 // Drain the stacks that have been preloaded with regions
236 // that are ready to fill.
237
238 cm->drain_region_stacks();
239
240 guarantee(cm->region_stack()->is_empty(), "Not empty");
241
242 size_t region_index = 0;
243 int random_seed = 17;
244
245 while(true) {
246 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
247 PSParallelCompact::fill_and_update_region(cm, region_index);
248 cm->drain_region_stacks();
249 } else {
250 if (terminator()->offer_termination()) {
251 break;
252 }
253 // Go around again.
254 }
255 }
256 return;
257 }
258
259 UpdateDensePrefixTask::UpdateDensePrefixTask(
260 PSParallelCompact::SpaceId space_id,
261 size_t region_index_start,
262 size_t region_index_end) :
263 _space_id(space_id), _region_index_start(region_index_start),
264 _region_index_end(region_index_end) {}
265
266 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
267
268 ParCompactionManager* cm =
269 ParCompactionManager::gc_thread_compaction_manager(which);
270
271 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
272 _space_id,
273 _region_index_start,
274 _region_index_end);
275 }