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_implementation/parallelScavenge/parallelScavengeHeap.hpp"
29 #include "gc_implementation/parallelScavenge/pcTasks.hpp"
30 #include "gc_implementation/parallelScavenge/psCompactionManager.inline.hpp"
31 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
32 #include "gc_implementation/shared/gcTimer.hpp"
33 #include "gc_implementation/shared/gcTraceTime.hpp"
34 #include "gc_interface/collectedHeap.hpp"
35 #include "memory/universe.hpp"
36 #include "oops/objArrayKlass.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/fprofiler.hpp"
40 #include "runtime/jniHandles.hpp"
41 #include "runtime/thread.hpp"
42 #include "runtime/vmThread.hpp"
43 #include "services/management.hpp"
44
45 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
46
47 //
48 // ThreadRootsMarkingTask
49 //
50
51 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
52 assert(Universe::heap()->is_gc_active(), "called outside gc");
53
54 ResourceMark rm;
55
56 NOT_PRODUCT(GCTraceTime tm("ThreadRootsMarkingTask",
57 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
58 ParCompactionManager* cm =
59 ParCompactionManager::gc_thread_compaction_manager(which);
60
61 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
62 CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);
63 MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
64
65 if (_java_thread != NULL)
66 _java_thread->oops_do(
67 &mark_and_push_closure,
68 &mark_and_push_from_clds,
69 &mark_and_push_in_blobs);
70
71 if (_vm_thread != NULL)
72 _vm_thread->oops_do(
73 &mark_and_push_closure,
74 &mark_and_push_from_clds,
75 &mark_and_push_in_blobs);
76
77 // Do the real work
78 cm->follow_marking_stacks();
79 }
80
81
82 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
83 assert(Universe::heap()->is_gc_active(), "called outside gc");
84
85 NOT_PRODUCT(GCTraceTime tm("MarkFromRootsTask",
86 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
87 ParCompactionManager* cm =
88 ParCompactionManager::gc_thread_compaction_manager(which);
89 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
90 PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);
91
92 switch (_root_type) {
93 case universe:
94 Universe::oops_do(&mark_and_push_closure);
95 break;
96
97 case jni_handles:
98 JNIHandles::oops_do(&mark_and_push_closure);
99 break;
100
101 case threads:
102 {
103 ResourceMark rm;
104 MarkingCodeBlobClosure each_active_code_blob(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
105 CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure);
106 Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob);
107 }
108 break;
109
110 case object_synchronizer:
111 ObjectSynchronizer::oops_do(&mark_and_push_closure);
112 break;
113
114 case flat_profiler:
115 FlatProfiler::oops_do(&mark_and_push_closure);
116 break;
117
118 case management:
119 Management::oops_do(&mark_and_push_closure);
120 break;
121
122 case jvmti:
123 JvmtiExport::oops_do(&mark_and_push_closure);
124 break;
125
126 case system_dictionary:
127 SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
128 break;
129
130 case class_loader_data:
131 ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);
132 break;
133
134 case code_cache:
135 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
136 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
137 break;
138
139 default:
140 fatal("Unknown root type");
141 }
142
143 // Do the real work
144 cm->follow_marking_stacks();
145 }
146
147
148 //
149 // RefProcTaskProxy
150 //
151
152 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
153 {
154 assert(Universe::heap()->is_gc_active(), "called outside gc");
155
156 NOT_PRODUCT(GCTraceTime tm("RefProcTask",
157 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
158 ParCompactionManager* cm =
159 ParCompactionManager::gc_thread_compaction_manager(which);
160 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
161 PSParallelCompact::FollowStackClosure follow_stack_closure(cm);
162 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
163 mark_and_push_closure, follow_stack_closure);
164 }
165
166 //
167 // RefProcTaskExecutor
168 //
169
170 void RefProcTaskExecutor::execute(ProcessTask& task)
171 {
172 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
173 uint parallel_gc_threads = heap->gc_task_manager()->workers();
174 uint active_gc_threads = heap->gc_task_manager()->active_workers();
175 RegionTaskQueueSet* qset = ParCompactionManager::region_array();
176 ParallelTaskTerminator terminator(active_gc_threads, qset);
177 GCTaskQueue* q = GCTaskQueue::create();
178 for(uint i=0; i<parallel_gc_threads; i++) {
179 q->enqueue(new RefProcTaskProxy(task, i));
180 }
181 if (task.marks_oops_alive()) {
182 if (parallel_gc_threads>1) {
183 for (uint j=0; j<active_gc_threads; j++) {
184 q->enqueue(new StealMarkingTask(&terminator));
185 }
186 }
187 }
188 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
189 }
190
191 void RefProcTaskExecutor::execute(EnqueueTask& task)
192 {
193 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
194 uint parallel_gc_threads = heap->gc_task_manager()->workers();
195 GCTaskQueue* q = GCTaskQueue::create();
196 for(uint i=0; i<parallel_gc_threads; i++) {
197 q->enqueue(new RefEnqueueTaskProxy(task, i));
198 }
199 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
200 }
201
202 //
203 // StealMarkingTask
204 //
205
206 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
207 _terminator(t) {}
208
209 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
210 assert(Universe::heap()->is_gc_active(), "called outside gc");
211
212 NOT_PRODUCT(GCTraceTime tm("StealMarkingTask",
213 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
214
215 ParCompactionManager* cm =
216 ParCompactionManager::gc_thread_compaction_manager(which);
217 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
218
219 oop obj = NULL;
220 ObjArrayTask task;
221 int random_seed = 17;
222 do {
223 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
224 cm->follow_contents((objArrayOop)task.obj(), task.index());
225 cm->follow_marking_stacks();
226 }
227 while (ParCompactionManager::steal(which, &random_seed, obj)) {
228 cm->follow_contents(obj);
229 cm->follow_marking_stacks();
230 }
231 } while (!terminator()->offer_termination());
232 }
233
234 //
235 // StealRegionCompactionTask
236 //
237
238 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
239 _terminator(t) {}
240
241 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
242 assert(Universe::heap()->is_gc_active(), "called outside gc");
243
244 NOT_PRODUCT(GCTraceTime tm("StealRegionCompactionTask",
245 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
246
247 ParCompactionManager* cm =
248 ParCompactionManager::gc_thread_compaction_manager(which);
249
250
251 // If not all threads are active, get a draining stack
252 // from the list. Else, just use this threads draining stack.
253 uint which_stack_index;
254 bool use_all_workers = manager->all_workers_active();
255 if (use_all_workers) {
256 which_stack_index = which;
257 assert(manager->active_workers() == ParallelGCThreads,
258 err_msg("all_workers_active has been incorrectly set: "
259 " active %d ParallelGCThreads %d", manager->active_workers(),
260 ParallelGCThreads));
261 } else {
262 which_stack_index = ParCompactionManager::pop_recycled_stack_index();
263 }
264
265 cm->set_region_stack_index(which_stack_index);
266 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
267 if (TraceDynamicGCThreads) {
268 gclog_or_tty->print_cr("StealRegionCompactionTask::do_it "
269 "region_stack_index %d region_stack = " PTR_FORMAT " "
270 " empty (%d) use all workers %d",
271 which_stack_index, ParCompactionManager::region_list(which_stack_index),
272 cm->region_stack()->is_empty(),
273 use_all_workers);
274 }
275
276 // Has to drain stacks first because there may be regions on
277 // preloaded onto the stack and this thread may never have
278 // done a draining task. Are the draining tasks needed?
279
280 cm->drain_region_stacks();
281
282 size_t region_index = 0;
283 int random_seed = 17;
284
285 // If we're the termination task, try 10 rounds of stealing before
286 // setting the termination flag
287
288 while(true) {
289 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
290 PSParallelCompact::fill_and_update_region(cm, region_index);
291 cm->drain_region_stacks();
292 } else {
293 if (terminator()->offer_termination()) {
294 break;
295 }
296 // Go around again.
297 }
298 }
299 return;
300 }
301
302 UpdateDensePrefixTask::UpdateDensePrefixTask(
303 PSParallelCompact::SpaceId space_id,
304 size_t region_index_start,
305 size_t region_index_end) :
306 _space_id(space_id), _region_index_start(region_index_start),
307 _region_index_end(region_index_end) {}
308
309 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
310
311 NOT_PRODUCT(GCTraceTime tm("UpdateDensePrefixTask",
312 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
313
314 ParCompactionManager* cm =
315 ParCompactionManager::gc_thread_compaction_manager(which);
316
317 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
318 _space_id,
319 _region_index_start,
320 _region_index_end);
321 }
322
323 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
324 assert(Universe::heap()->is_gc_active(), "called outside gc");
325
326 NOT_PRODUCT(GCTraceTime tm("DrainStacksCompactionTask",
327 PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
328
329 ParCompactionManager* cm =
330 ParCompactionManager::gc_thread_compaction_manager(which);
331
332 uint which_stack_index;
333 bool use_all_workers = manager->all_workers_active();
334 if (use_all_workers) {
335 which_stack_index = which;
336 assert(manager->active_workers() == ParallelGCThreads,
337 err_msg("all_workers_active has been incorrectly set: "
338 " active %d ParallelGCThreads %d", manager->active_workers(),
339 ParallelGCThreads));
340 } else {
341 which_stack_index = stack_index();
342 }
343
344 cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
345 if (TraceDynamicGCThreads) {
346 gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d "
347 "which_stack_index = %d/empty(%d) "
348 "use all workers %d",
349 which, which_stack_index,
350 cm->region_stack()->is_empty(),
351 use_all_workers);
352 }
353
354 cm->set_region_stack_index(which_stack_index);
355
356 // Process any regions already in the compaction managers stacks.
357 cm->drain_region_stacks();
358
359 assert(cm->region_stack()->is_empty(), "Not empty");
360
361 if (!use_all_workers) {
362 // Always give up the region stack.
363 assert(cm->region_stack() ==
364 ParCompactionManager::region_list(cm->region_stack_index()),
365 "region_stack and region_stack_index are inconsistent");
366 ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());
367
368 if (TraceDynamicGCThreads) {
369 void* old_region_stack = (void*) cm->region_stack();
370 int old_region_stack_index = cm->region_stack_index();
371 gclog_or_tty->print_cr("Pushing region stack " PTR_FORMAT "/%d",
372 old_region_stack, old_region_stack_index);
373 }
374
375 cm->set_region_stack(NULL);
376 cm->set_region_stack_index((uint)max_uintx);
377 }
378 }