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 ParCompactionManager* cm =
83 ParCompactionManager::gc_thread_compaction_manager(which);
84 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
85 ParCompactionManager::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);
86
87 switch (_root_type) {
88 case universe:
89 Universe::oops_do(&mark_and_push_closure);
90 break;
91
92 case jni_handles:
93 JNIHandles::oops_do(&mark_and_push_closure);
94 break;
95
96 case threads:
97 {
98 ResourceMark rm;
99 MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
100 CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure);
101 Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob);
102 }
103 break;
104
105 case object_synchronizer:
106 ObjectSynchronizer::oops_do(&mark_and_push_closure);
107 break;
108
109 case flat_profiler:
110 FlatProfiler::oops_do(&mark_and_push_closure);
111 break;
112
113 case management:
114 Management::oops_do(&mark_and_push_closure);
115 break;
116
117 case jvmti:
118 JvmtiExport::oops_do(&mark_and_push_closure);
119 break;
120
121 case system_dictionary:
122 SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
123 break;
124
125 case class_loader_data:
126 ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);
127 break;
128
129 case code_cache:
130 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
131 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
132 break;
133
134 default:
135 fatal("Unknown root type");
136 }
137
138 // Do the real work
139 cm->follow_marking_stacks();
140 }
141
142
143 //
144 // RefProcTaskProxy
145 //
146
147 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
148 {
149 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
150 ParCompactionManager* cm = 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 RegionTaskQueueSet* qset = ParCompactionManager::region_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 = ParCompactionManager::gc_thread_compaction_manager(which);
204 ParCompactionManager::MarkAndPushClosure mark_and_push_closure(cm);
205
206 oop obj = NULL;
207 ObjArrayTask task;
208 int random_seed = 17;
209 do {
210 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
211 cm->follow_contents((objArrayOop)task.obj(), task.index());
212 cm->follow_marking_stacks();
213 }
214 while (ParCompactionManager::steal(which, &random_seed, obj)) {
215 cm->follow_contents(obj);
216 cm->follow_marking_stacks();
217 }
218 } while (!terminator()->offer_termination());
219 }
220
221 //
222 // StealRegionCompactionTask
223 //
224
225 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
226 _terminator(t) {}
227
228 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
229 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
230
231 ParCompactionManager* cm = ParCompactionManager::gc_thread_compaction_manager(which);
232
233 // If not all threads are active, get a draining stack
234 // from the list. Else, just use this threads draining stack.
235 uint which_stack_index;
236 bool use_all_workers = manager->all_workers_active();
237 if (use_all_workers) {
238 which_stack_index = which;
239 assert(manager->active_workers() == ParallelGCThreads,
240 "all_workers_active has been incorrectly set: "
241 " active %d ParallelGCThreads %u", manager->active_workers(),
242 ParallelGCThreads);
243 } else {
244 which_stack_index = ParCompactionManager::pop_recycled_stack_index();
245 }
246
247 cm->set_region_stack_index(which_stack_index);
248 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
249
250 // Has to drain stacks first because there may be regions on
251 // preloaded onto the stack and this thread may never have
252 // done a draining task. Are the draining tasks needed?
253
254 cm->drain_region_stacks();
255
256 size_t region_index = 0;
257 int random_seed = 17;
258
259 // If we're the termination task, try 10 rounds of stealing before
260 // setting the termination flag
261
262 while(true) {
263 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
264 PSParallelCompact::fill_and_update_region(cm, region_index);
265 cm->drain_region_stacks();
266 } else {
267 if (terminator()->offer_termination()) {
268 break;
269 }
270 // Go around again.
271 }
272 }
273 return;
274 }
275
276 UpdateDensePrefixTask::UpdateDensePrefixTask(
277 PSParallelCompact::SpaceId space_id,
278 size_t region_index_start,
279 size_t region_index_end) :
280 _space_id(space_id), _region_index_start(region_index_start),
281 _region_index_end(region_index_end) {}
282
283 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
284 ParCompactionManager* cm = ParCompactionManager::gc_thread_compaction_manager(which);
285
286 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
287 _space_id,
288 _region_index_start,
289 _region_index_end);
290 }
291
292 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
293 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc");
294 ParCompactionManager* cm = ParCompactionManager::gc_thread_compaction_manager(which);
295
296 uint which_stack_index;
297 bool use_all_workers = manager->all_workers_active();
298 if (use_all_workers) {
299 which_stack_index = which;
300 assert(manager->active_workers() == ParallelGCThreads,
301 "all_workers_active has been incorrectly set: "
302 " active %d ParallelGCThreads %u", manager->active_workers(),
303 ParallelGCThreads);
304 } else {
305 which_stack_index = stack_index();
306 }
307
308 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
309
310 cm->set_region_stack_index(which_stack_index);
311
312 // Process any regions already in the compaction managers stacks.
313 cm->drain_region_stacks();
314
315 assert(cm->region_stack()->is_empty(), "Not empty");
316
317 if (!use_all_workers) {
318 // Always give up the region stack.
319 assert(cm->region_stack() ==
320 ParCompactionManager::region_list(cm->region_stack_index()),
321 "region_stack and region_stack_index are inconsistent");
322 ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());
323
324 cm->set_region_stack(NULL);
325 cm->set_region_stack_index((uint)max_uintx);
326 }
327 }