1 /*
2 * Copyright (c) 2005, 2013, 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/pcTasks.hpp"
29 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
30 #include "gc_implementation/shared/gcTimer.hpp"
31 #include "gc_implementation/shared/gcTraceTime.hpp"
32 #include "gc_interface/collectedHeap.hpp"
33 #include "memory/universe.hpp"
34 #include "oops/objArrayKlass.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "oops/oop.pcgc.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/fprofiler.hpp"
39 #include "runtime/jniHandles.hpp"
40 #include "runtime/thread.hpp"
41 #include "runtime/vmThread.hpp"
42 #include "services/management.hpp"
43
44 //
45 // ThreadRootsMarkingTask
46 //
47
48 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
49 assert(Universe::heap()->is_gc_active(), "called outside gc");
50
51 ResourceMark rm;
52
53 NOT_PRODUCT(GCTraceTime tm("ThreadRootsMarkingTask",
54 PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
55 ParCompactionManager* cm =
56 ParCompactionManager::gc_thread_compaction_manager(which);
57
58 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
59 CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);
60 CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true);
61
62 if (_java_thread != NULL)
63 _java_thread->oops_do(
64 &mark_and_push_closure,
65 &mark_and_push_from_clds,
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_from_clds,
72 &mark_and_push_in_blobs);
73
74 // Do the real work
75 cm->follow_marking_stacks();
76 }
77
78
79 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
80 assert(Universe::heap()->is_gc_active(), "called outside gc");
81
82 NOT_PRODUCT(GCTraceTime tm("MarkFromRootsTask",
83 PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
84 ParCompactionManager* cm =
85 ParCompactionManager::gc_thread_compaction_manager(which);
86 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
87 PSParallelCompact::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 CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);
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(Universe::heap()->is_gc_active(), "called outside gc");
152
153 NOT_PRODUCT(GCTraceTime tm("RefProcTask",
154 PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
155 ParCompactionManager* cm =
156 ParCompactionManager::gc_thread_compaction_manager(which);
157 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
158 PSParallelCompact::FollowStackClosure follow_stack_closure(cm);
159 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
160 mark_and_push_closure, follow_stack_closure);
161 }
162
163 //
164 // RefProcTaskExecutor
165 //
166
167 void RefProcTaskExecutor::execute(ProcessTask& task)
168 {
169 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
170 uint parallel_gc_threads = heap->gc_task_manager()->workers();
171 uint active_gc_threads = heap->gc_task_manager()->active_workers();
172 RegionTaskQueueSet* qset = ParCompactionManager::region_array();
173 ParallelTaskTerminator terminator(active_gc_threads, qset);
174 GCTaskQueue* q = GCTaskQueue::create();
175 for(uint i=0; i<parallel_gc_threads; i++) {
176 q->enqueue(new RefProcTaskProxy(task, i));
177 }
178 if (task.marks_oops_alive()) {
179 if (parallel_gc_threads>1) {
180 for (uint j=0; j<active_gc_threads; j++) {
181 q->enqueue(new StealMarkingTask(&terminator));
182 }
183 }
184 }
185 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
186 }
187
188 void RefProcTaskExecutor::execute(EnqueueTask& task)
189 {
190 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
191 uint parallel_gc_threads = heap->gc_task_manager()->workers();
192 GCTaskQueue* q = GCTaskQueue::create();
193 for(uint i=0; i<parallel_gc_threads; i++) {
194 q->enqueue(new RefEnqueueTaskProxy(task, i));
195 }
196 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
197 }
198
199 //
200 // StealMarkingTask
201 //
202
203 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
204 _terminator(t) {}
205
206 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
207 assert(Universe::heap()->is_gc_active(), "called outside gc");
208
209 NOT_PRODUCT(GCTraceTime tm("StealMarkingTask",
210 PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
211
212 ParCompactionManager* cm =
213 ParCompactionManager::gc_thread_compaction_manager(which);
214 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
215
216 oop obj = NULL;
217 ObjArrayTask task;
218 int random_seed = 17;
219 do {
220 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
221 ObjArrayKlass* k = (ObjArrayKlass*)task.obj()->klass();
222 k->oop_follow_contents(cm, task.obj(), task.index());
223 cm->follow_marking_stacks();
224 }
225 while (ParCompactionManager::steal(which, &random_seed, obj)) {
226 obj->follow_contents(cm);
227 cm->follow_marking_stacks();
228 }
229 } while (!terminator()->offer_termination());
230 }
231
232 //
233 // StealRegionCompactionTask
234 //
235
236 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
237 _terminator(t) {}
238
239 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
240 assert(Universe::heap()->is_gc_active(), "called outside gc");
241
242 NOT_PRODUCT(GCTraceTime tm("StealRegionCompactionTask",
243 PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
244
245 ParCompactionManager* cm =
246 ParCompactionManager::gc_thread_compaction_manager(which);
247
248
249 // If not all threads are active, get a draining stack
250 // from the list. Else, just use this threads draining stack.
251 uint which_stack_index;
252 bool use_all_workers = manager->all_workers_active();
253 if (use_all_workers) {
254 which_stack_index = which;
255 assert(manager->active_workers() == ParallelGCThreads,
256 err_msg("all_workers_active has been incorrectly set: "
257 " active %d ParallelGCThreads %d", manager->active_workers(),
258 ParallelGCThreads));
259 } else {
260 which_stack_index = ParCompactionManager::pop_recycled_stack_index();
261 }
262
263 cm->set_region_stack_index(which_stack_index);
264 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
265 if (TraceDynamicGCThreads) {
266 gclog_or_tty->print_cr("StealRegionCompactionTask::do_it "
267 "region_stack_index %d region_stack = 0x%x "
268 " empty (%d) use all workers %d",
269 which_stack_index, ParCompactionManager::region_list(which_stack_index),
270 cm->region_stack()->is_empty(),
271 use_all_workers);
272 }
273
274 // Has to drain stacks first because there may be regions on
275 // preloaded onto the stack and this thread may never have
276 // done a draining task. Are the draining tasks needed?
277
278 cm->drain_region_stacks();
279
280 size_t region_index = 0;
281 int random_seed = 17;
282
283 // If we're the termination task, try 10 rounds of stealing before
284 // setting the termination flag
285
286 while(true) {
287 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
288 PSParallelCompact::fill_and_update_region(cm, region_index);
289 cm->drain_region_stacks();
290 } else {
291 if (terminator()->offer_termination()) {
292 break;
293 }
294 // Go around again.
295 }
296 }
297 return;
298 }
299
300 UpdateDensePrefixTask::UpdateDensePrefixTask(
301 PSParallelCompact::SpaceId space_id,
302 size_t region_index_start,
303 size_t region_index_end) :
304 _space_id(space_id), _region_index_start(region_index_start),
305 _region_index_end(region_index_end) {}
306
307 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
308
309 NOT_PRODUCT(GCTraceTime tm("UpdateDensePrefixTask",
310 PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
311
312 ParCompactionManager* cm =
313 ParCompactionManager::gc_thread_compaction_manager(which);
314
315 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
316 _space_id,
317 _region_index_start,
318 _region_index_end);
319 }
320
321 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
322 assert(Universe::heap()->is_gc_active(), "called outside gc");
323
324 NOT_PRODUCT(GCTraceTime tm("DrainStacksCompactionTask",
325 PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
326
327 ParCompactionManager* cm =
328 ParCompactionManager::gc_thread_compaction_manager(which);
329
330 uint which_stack_index;
331 bool use_all_workers = manager->all_workers_active();
332 if (use_all_workers) {
333 which_stack_index = which;
334 assert(manager->active_workers() == ParallelGCThreads,
335 err_msg("all_workers_active has been incorrectly set: "
336 " active %d ParallelGCThreads %d", manager->active_workers(),
337 ParallelGCThreads));
338 } else {
339 which_stack_index = stack_index();
340 }
341
342 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
343 if (TraceDynamicGCThreads) {
344 gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d "
345 "which_stack_index = %d/empty(%d) "
346 "use all workers %d",
347 which, which_stack_index,
348 cm->region_stack()->is_empty(),
349 use_all_workers);
350 }
351
352 cm->set_region_stack_index(which_stack_index);
353
354 // Process any regions already in the compaction managers stacks.
355 cm->drain_region_stacks();
356
357 assert(cm->region_stack()->is_empty(), "Not empty");
358
359 if (!use_all_workers) {
360 // Always give up the region stack.
361 assert(cm->region_stack() ==
362 ParCompactionManager::region_list(cm->region_stack_index()),
363 "region_stack and region_stack_index are inconsistent");
364 ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());
365
366 if (TraceDynamicGCThreads) {
367 void* old_region_stack = (void*) cm->region_stack();
368 int old_region_stack_index = cm->region_stack_index();
369 gclog_or_tty->print_cr("Pushing region stack 0x%x/%d",
370 old_region_stack, old_region_stack_index);
371 }
372
373 cm->set_region_stack(NULL);
374 cm->set_region_stack_index((uint)max_uintx);
375 }
376 }