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 CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);
62 MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
63
64 if (_java_thread != NULL)
65 _java_thread->oops_do(
66 &mark_and_push_closure,
67 &mark_and_push_from_clds,
68 &mark_and_push_in_blobs);
69
70 if (_vm_thread != NULL)
71 _vm_thread->oops_do(
72 &mark_and_push_closure,
73 &mark_and_push_from_clds,
74 &mark_and_push_in_blobs);
75
76 // Do the real work
77 cm->follow_marking_stacks();
78 }
79
80
81 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
82 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
83
84 ParCompactionManager* cm =
85 ParCompactionManager::gc_thread_compaction_manager(which);
86 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
87 ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);
88
89 switch (_root_type) {
90 case universe:
91 Universe::oops_do(&mark_and_push_closure);
92 break;
93
94 case jni_handles:
95 JNIHandles::oops_do(&mark_and_push_closure);
96 break;
97
98 case threads:
99 {
100 ResourceMark rm;
101 MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
102 CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure);
103 Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob);
104 }
105 break;
106
107 case object_synchronizer:
108 ObjectSynchronizer::oops_do(&mark_and_push_closure);
109 break;
110
111 case flat_profiler:
112 FlatProfiler::oops_do(&mark_and_push_closure);
113 break;
114
115 case management:
116 Management::oops_do(&mark_and_push_closure);
117 break;
118
119 case jvmti:
120 JvmtiExport::oops_do(&mark_and_push_closure);
121 break;
122
123 case system_dictionary:
124 SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
125 break;
126
127 case class_loader_data:
128 ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);
129 break;
130
131 case code_cache:
132 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
133 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
134 break;
135
136 default:
137 fatal("Unknown root type");
138 }
139
140 // Do the real work
141 cm->follow_marking_stacks();
142 }
143
144
145 //
146 // RefProcTaskProxy
147 //
148
149 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
150 {
151 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
152
153 ParCompactionManager* cm =
154 ParCompactionManager::gc_thread_compaction_manager(which);
155 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
156 ParCompactionManager::FollowStackClosure follow_stack_closure(cm);
157 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
158 mark_and_push_closure, follow_stack_closure);
159 }
160
161 //
162 // RefProcTaskExecutor
163 //
164
165 void RefProcTaskExecutor::execute(ProcessTask& task)
166 {
167 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
168 uint parallel_gc_threads = heap->gc_task_manager()->workers();
169 uint active_gc_threads = heap->gc_task_manager()->active_workers();
170 OopTaskQueueSet* qset = ParCompactionManager::stack_array();
171 ParallelTaskTerminator terminator(active_gc_threads, qset);
172 GCTaskQueue* q = GCTaskQueue::create();
173 for(uint i=0; i<parallel_gc_threads; i++) {
174 q->enqueue(new RefProcTaskProxy(task, i));
175 }
176 if (task.marks_oops_alive()) {
177 if (parallel_gc_threads>1) {
178 for (uint j=0; j<active_gc_threads; j++) {
179 q->enqueue(new StealMarkingTask(&terminator));
180 }
181 }
182 }
183 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
184 }
185
186 void RefProcTaskExecutor::execute(EnqueueTask& task)
187 {
188 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
189 uint parallel_gc_threads = heap->gc_task_manager()->workers();
190 GCTaskQueue* q = GCTaskQueue::create();
191 for(uint i=0; i<parallel_gc_threads; i++) {
192 q->enqueue(new RefEnqueueTaskProxy(task, i));
193 }
194 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
195 }
196
197 //
198 // StealMarkingTask
199 //
200
201 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
202 _terminator(t) {}
203
204 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
205 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
206
207 ParCompactionManager* cm =
208 ParCompactionManager::gc_thread_compaction_manager(which);
209 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
210
211 oop obj = NULL;
212 ObjArrayTask task;
213 int random_seed = 17;
214 do {
215 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
216 cm->follow_contents((objArrayOop)task.obj(), task.index());
217 cm->follow_marking_stacks();
218 }
219 while (ParCompactionManager::steal(which, &random_seed, obj)) {
220 cm->follow_contents(obj);
221 cm->follow_marking_stacks();
222 }
223 } while (!terminator()->offer_termination());
224 }
225
226 //
227 // StealRegionCompactionTask
228 //
229
230 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
231 _terminator(t) {}
232
233 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
234 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
235
236 ParCompactionManager* cm =
237 ParCompactionManager::gc_thread_compaction_manager(which);
238
239
240 // If not all threads are active, get a draining stack
241 // from the list. Else, just use this threads draining stack.
242 uint which_stack_index;
243 bool use_all_workers = manager->all_workers_active();
244 if (use_all_workers) {
245 which_stack_index = which;
246 assert(manager->active_workers() == ParallelGCThreads,
247 "all_workers_active has been incorrectly set: "
248 " active %d ParallelGCThreads %u", manager->active_workers(),
249 ParallelGCThreads);
250 } else {
251 which_stack_index = ParCompactionManager::pop_recycled_stack_index();
252 }
253
254 cm->set_region_stack_index(which_stack_index);
255 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
256
257 // Has to drain stacks first because there may be regions on
258 // preloaded onto the stack and this thread may never have
259 // done a draining task. Are the draining tasks needed?
260
261 cm->drain_region_stacks();
262
263 size_t region_index = 0;
264 int random_seed = 17;
265
266 // If we're the termination task, try 10 rounds of stealing before
267 // setting the termination flag
268
269 while(true) {
270 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
271 PSParallelCompact::fill_and_update_region(cm, region_index);
272 cm->drain_region_stacks();
273 } else {
274 if (terminator()->offer_termination()) {
275 break;
276 }
277 // Go around again.
278 }
279 }
280 return;
281 }
282
283 UpdateDensePrefixTask::UpdateDensePrefixTask(
284 PSParallelCompact::SpaceId space_id,
285 size_t region_index_start,
286 size_t region_index_end) :
287 _space_id(space_id), _region_index_start(region_index_start),
288 _region_index_end(region_index_end) {}
289
290 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
291
292 ParCompactionManager* cm =
293 ParCompactionManager::gc_thread_compaction_manager(which);
294
295 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
296 _space_id,
297 _region_index_start,
298 _region_index_end);
299 }
300
301 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
302 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
303
304 ParCompactionManager* cm =
305 ParCompactionManager::gc_thread_compaction_manager(which);
306
307 uint which_stack_index;
308 bool use_all_workers = manager->all_workers_active();
309 if (use_all_workers) {
310 which_stack_index = which;
311 assert(manager->active_workers() == ParallelGCThreads,
312 "all_workers_active has been incorrectly set: "
313 " active %d ParallelGCThreads %u", manager->active_workers(),
314 ParallelGCThreads);
315 } else {
316 which_stack_index = stack_index();
317 }
318
319 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
320
321 cm->set_region_stack_index(which_stack_index);
322
323 // Process any regions already in the compaction managers stacks.
324 cm->drain_region_stacks();
325
326 assert(cm->region_stack()->is_empty(), "Not empty");
327
328 if (!use_all_workers) {
329 // Always give up the region stack.
330 assert(cm->region_stack() ==
331 ParCompactionManager::region_list(cm->region_stack_index()),
332 "region_stack and region_stack_index are inconsistent");
333 ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());
334
335 cm->set_region_stack(NULL);
336 cm->set_region_stack_index((uint)max_uintx);
337 }
338 }