1 /*
2 * Copyright (c) 2005, 2015, 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.hpp"
35 #include "logging/log.hpp"
36 #include "memory/universe.hpp"
37 #include "oops/objArrayKlass.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/fprofiler.hpp"
41 #include "runtime/jniHandles.hpp"
42 #include "runtime/thread.hpp"
43 #include "runtime/vmThread.hpp"
44 #include "services/management.hpp"
45 #include "utilities/stack.inline.hpp"
46
47 //
48 // ThreadRootsMarkingTask
49 //
50
51 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
52 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
53
54 ResourceMark rm;
55
56 ParCompactionManager* cm =
57 ParCompactionManager::gc_thread_compaction_manager(which);
58
59 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
60 CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);
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_from_clds,
67 &mark_and_push_in_blobs);
68
69 if (_vm_thread != NULL)
70 _vm_thread->oops_do(
71 &mark_and_push_closure,
72 &mark_and_push_from_clds,
73 &mark_and_push_in_blobs);
74
75 // Do the real work
76 cm->follow_marking_stacks();
77 }
78
79
80 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
81 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
82
83 ParCompactionManager* cm =
84 ParCompactionManager::gc_thread_compaction_manager(which);
85 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
86 ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);
87
88 switch (_root_type) {
89 case universe:
90 Universe::oops_do(&mark_and_push_closure);
91 break;
92
93 case jni_handles:
94 JNIHandles::oops_do(&mark_and_push_closure);
95 break;
96
97 case threads:
98 {
99 ResourceMark rm;
100 MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
101 CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure);
102 Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob);
103 }
104 break;
105
106 case object_synchronizer:
107 ObjectSynchronizer::oops_do(&mark_and_push_closure);
108 break;
109
110 case flat_profiler:
111 FlatProfiler::oops_do(&mark_and_push_closure);
112 break;
113
114 case management:
115 Management::oops_do(&mark_and_push_closure);
116 break;
117
118 case jvmti:
119 JvmtiExport::oops_do(&mark_and_push_closure);
120 break;
121
122 case system_dictionary:
123 SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
124 break;
125
126 case class_loader_data:
127 ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);
128 break;
129
130 case code_cache:
131 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
132 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
133 break;
134
135 default:
136 fatal("Unknown root type");
137 }
138
139 // Do the real work
140 cm->follow_marking_stacks();
141 }
142
143
144 //
145 // RefProcTaskProxy
146 //
147
148 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
149 {
150 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
151
152 ParCompactionManager* cm =
153 ParCompactionManager::gc_thread_compaction_manager(which);
154 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
155 ParCompactionManager::FollowStackClosure follow_stack_closure(cm);
156 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
157 mark_and_push_closure, follow_stack_closure);
158 }
159
160 //
161 // RefProcTaskExecutor
162 //
163
164 void RefProcTaskExecutor::execute(ProcessTask& task)
165 {
166 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
167 uint parallel_gc_threads = heap->gc_task_manager()->workers();
168 uint active_gc_threads = heap->gc_task_manager()->active_workers();
169 RegionTaskQueueSet* qset = ParCompactionManager::region_array();
170 ParallelTaskTerminator terminator(active_gc_threads, qset);
171 GCTaskQueue* q = GCTaskQueue::create();
172 for(uint i=0; i<parallel_gc_threads; i++) {
173 q->enqueue(new RefProcTaskProxy(task, i));
174 }
175 if (task.marks_oops_alive()) {
176 if (parallel_gc_threads>1) {
177 for (uint j=0; j<active_gc_threads; j++) {
178 q->enqueue(new StealMarkingTask(&terminator));
179 }
180 }
181 }
182 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
183 }
184
185 void RefProcTaskExecutor::execute(EnqueueTask& task)
186 {
187 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
188 uint parallel_gc_threads = heap->gc_task_manager()->workers();
189 GCTaskQueue* q = GCTaskQueue::create();
190 for(uint i=0; i<parallel_gc_threads; i++) {
191 q->enqueue(new RefEnqueueTaskProxy(task, i));
192 }
193 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
194 }
195
196 //
197 // StealMarkingTask
198 //
199
200 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
201 _terminator(t) {}
202
203 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
204 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
205
206 ParCompactionManager* cm =
207 ParCompactionManager::gc_thread_compaction_manager(which);
208 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
209
210 oop obj = NULL;
211 ObjArrayTask task;
212 int random_seed = 17;
213 do {
214 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
215 cm->follow_contents((objArrayOop)task.obj(), task.index());
216 cm->follow_marking_stacks();
217 }
218 while (ParCompactionManager::steal(which, &random_seed, obj)) {
219 cm->follow_contents(obj);
220 cm->follow_marking_stacks();
221 }
222 } while (!terminator()->offer_termination());
223 }
224
225 //
226 // StealRegionCompactionTask
227 //
228
229 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
230 _terminator(t) {}
231
232 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
233 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
234
235 ParCompactionManager* cm =
236 ParCompactionManager::gc_thread_compaction_manager(which);
237
238
239 // If not all threads are active, get a draining stack
240 // from the list. Else, just use this threads draining stack.
241 uint which_stack_index;
242 bool use_all_workers = manager->all_workers_active();
243 if (use_all_workers) {
244 which_stack_index = which;
245 assert(manager->active_workers() == ParallelGCThreads,
246 "all_workers_active has been incorrectly set: "
247 " active %d ParallelGCThreads %u", manager->active_workers(),
248 ParallelGCThreads);
249 } else {
250 which_stack_index = ParCompactionManager::pop_recycled_stack_index();
251 }
252
253 cm->set_region_stack_index(which_stack_index);
254 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
255
256 // Has to drain stacks first because there may be regions on
257 // preloaded onto the stack and this thread may never have
258 // done a draining task. Are the draining tasks needed?
259
260 cm->drain_region_stacks();
261
262 size_t region_index = 0;
263 int random_seed = 17;
264
265 // If we're the termination task, try 10 rounds of stealing before
266 // setting the termination flag
267
268 while(true) {
269 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
270 PSParallelCompact::fill_and_update_region(cm, region_index);
271 cm->drain_region_stacks();
272 } else {
273 if (terminator()->offer_termination()) {
274 break;
275 }
276 // Go around again.
277 }
278 }
279 return;
280 }
281
282 UpdateDensePrefixTask::UpdateDensePrefixTask(
283 PSParallelCompact::SpaceId space_id,
284 size_t region_index_start,
285 size_t region_index_end) :
286 _space_id(space_id), _region_index_start(region_index_start),
287 _region_index_end(region_index_end) {}
288
289 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
290
291 ParCompactionManager* cm =
292 ParCompactionManager::gc_thread_compaction_manager(which);
293
294 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
295 _space_id,
296 _region_index_start,
297 _region_index_end);
298 }
299
300 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
301 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
302
303 ParCompactionManager* cm =
304 ParCompactionManager::gc_thread_compaction_manager(which);
305
306 uint which_stack_index;
307 bool use_all_workers = manager->all_workers_active();
308 if (use_all_workers) {
309 which_stack_index = which;
310 assert(manager->active_workers() == ParallelGCThreads,
311 "all_workers_active has been incorrectly set: "
312 " active %d ParallelGCThreads %u", manager->active_workers(),
313 ParallelGCThreads);
314 } else {
315 which_stack_index = stack_index();
316 }
317
318 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
319
320 cm->set_region_stack_index(which_stack_index);
321
322 // Process any regions already in the compaction managers stacks.
323 cm->drain_region_stacks();
324
325 assert(cm->region_stack()->is_empty(), "Not empty");
326
327 if (!use_all_workers) {
328 // Always give up the region stack.
329 assert(cm->region_stack() ==
330 ParCompactionManager::region_list(cm->region_stack_index()),
331 "region_stack and region_stack_index are inconsistent");
332 ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());
333
334 cm->set_region_stack(NULL);
335 cm->set_region_stack_index((uint)max_uintx);
336 }
337 }