1 /*
2 * Copyright (c) 2005, 2010, 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_interface/collectedHeap.hpp"
31 #include "memory/universe.hpp"
32 #include "oops/objArrayKlass.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "oops/oop.pcgc.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/fprofiler.hpp"
37 #include "runtime/jniHandles.hpp"
38 #include "runtime/thread.hpp"
39 #include "runtime/vmThread.hpp"
40 #include "services/management.hpp"
41
42 //
43 // ThreadRootsMarkingTask
44 //
45
46 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
47 assert(Universe::heap()->is_gc_active(), "called outside gc");
48
49 ResourceMark rm;
50
51 NOT_PRODUCT(TraceTime tm("ThreadRootsMarkingTask",
52 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
53 ParCompactionManager* cm =
54 ParCompactionManager::gc_thread_compaction_manager(which);
55 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
56 CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true);
57
58 if (_java_thread != NULL)
59 _java_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);
60
61 if (_vm_thread != NULL)
62 _vm_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);
63
64 // Do the real work
65 cm->follow_marking_stacks();
66 }
67
68
69 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
70 assert(Universe::heap()->is_gc_active(), "called outside gc");
71
72 NOT_PRODUCT(TraceTime tm("MarkFromRootsTask",
73 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
74 ParCompactionManager* cm =
75 ParCompactionManager::gc_thread_compaction_manager(which);
76 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
77
78 switch (_root_type) {
79 case universe:
80 Universe::oops_do(&mark_and_push_closure);
81 break;
82
83 case reference_processing:
84 ReferenceProcessor::oops_do(&mark_and_push_closure);
85 break;
86
87 case jni_handles:
88 JNIHandles::oops_do(&mark_and_push_closure);
89 break;
90
91 case threads:
92 {
93 ResourceMark rm;
94 CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);
95 Threads::oops_do(&mark_and_push_closure, &each_active_code_blob);
96 }
97 break;
98
99 case object_synchronizer:
100 ObjectSynchronizer::oops_do(&mark_and_push_closure);
101 break;
102
103 case flat_profiler:
104 FlatProfiler::oops_do(&mark_and_push_closure);
105 break;
106
107 case management:
108 Management::oops_do(&mark_and_push_closure);
109 break;
110
111 case jvmti:
112 JvmtiExport::oops_do(&mark_and_push_closure);
113 break;
114
115 case system_dictionary:
116 SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
117 break;
118
119 case vm_symbols:
120 vmSymbols::oops_do(&mark_and_push_closure);
121 break;
122
123 case code_cache:
124 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
125 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
126 break;
127
128 default:
129 fatal("Unknown root type");
130 }
131
132 // Do the real work
133 cm->follow_marking_stacks();
134 }
135
136
137 //
138 // RefProcTaskProxy
139 //
140
141 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
142 {
143 assert(Universe::heap()->is_gc_active(), "called outside gc");
144
145 NOT_PRODUCT(TraceTime tm("RefProcTask",
146 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
147 ParCompactionManager* cm =
148 ParCompactionManager::gc_thread_compaction_manager(which);
149 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
150 PSParallelCompact::FollowStackClosure follow_stack_closure(cm);
151 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
152 mark_and_push_closure, follow_stack_closure);
153 }
154
155 //
156 // RefProcTaskExecutor
157 //
158
159 void RefProcTaskExecutor::execute(ProcessTask& task)
160 {
161 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
162 uint parallel_gc_threads = heap->gc_task_manager()->workers();
163 RegionTaskQueueSet* qset = ParCompactionManager::region_array();
164 ParallelTaskTerminator terminator(parallel_gc_threads, qset);
165 GCTaskQueue* q = GCTaskQueue::create();
166 for(uint i=0; i<parallel_gc_threads; i++) {
167 q->enqueue(new RefProcTaskProxy(task, i));
168 }
169 if (task.marks_oops_alive()) {
170 if (parallel_gc_threads>1) {
171 for (uint j=0; j<parallel_gc_threads; j++) {
172 q->enqueue(new StealMarkingTask(&terminator));
173 }
174 }
175 }
176 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
177 }
178
179 void RefProcTaskExecutor::execute(EnqueueTask& task)
180 {
181 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
182 uint parallel_gc_threads = heap->gc_task_manager()->workers();
183 GCTaskQueue* q = GCTaskQueue::create();
184 for(uint i=0; i<parallel_gc_threads; i++) {
185 q->enqueue(new RefEnqueueTaskProxy(task, i));
186 }
187 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
188 }
189
190 //
191 // StealMarkingTask
192 //
193
194 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
195 _terminator(t) {}
196
197 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
198 assert(Universe::heap()->is_gc_active(), "called outside gc");
199
200 NOT_PRODUCT(TraceTime tm("StealMarkingTask",
201 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
202
203 ParCompactionManager* cm =
204 ParCompactionManager::gc_thread_compaction_manager(which);
205 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
206
207 oop obj = NULL;
208 ObjArrayTask task;
209 int random_seed = 17;
210 do {
211 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
212 objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
213 k->oop_follow_contents(cm, task.obj(), task.index());
214 cm->follow_marking_stacks();
215 }
216 while (ParCompactionManager::steal(which, &random_seed, obj)) {
217 obj->follow_contents(cm);
218 cm->follow_marking_stacks();
219 }
220 } while (!terminator()->offer_termination());
221 }
222
223 //
224 // StealRegionCompactionTask
225 //
226
227
228 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
229 _terminator(t) {}
230
231 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
232 assert(Universe::heap()->is_gc_active(), "called outside gc");
233
234 NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask",
235 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
236
237 ParCompactionManager* cm =
238 ParCompactionManager::gc_thread_compaction_manager(which);
239
240 // Has to drain stacks first because there may be regions on
241 // preloaded onto the stack and this thread may never have
242 // done a draining task. Are the draining tasks needed?
243
244 cm->drain_region_stacks();
245
246 size_t region_index = 0;
247 int random_seed = 17;
248
249 // If we're the termination task, try 10 rounds of stealing before
250 // setting the termination flag
251
252 while(true) {
253 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
254 PSParallelCompact::fill_and_update_region(cm, region_index);
255 cm->drain_region_stacks();
256 } else {
257 if (terminator()->offer_termination()) {
258 break;
259 }
260 // Go around again.
261 }
262 }
263 return;
264 }
265
266 UpdateDensePrefixTask::UpdateDensePrefixTask(
267 PSParallelCompact::SpaceId space_id,
268 size_t region_index_start,
269 size_t region_index_end) :
270 _space_id(space_id), _region_index_start(region_index_start),
271 _region_index_end(region_index_end) {}
272
273 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
274
275 NOT_PRODUCT(TraceTime tm("UpdateDensePrefixTask",
276 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
277
278 ParCompactionManager* cm =
279 ParCompactionManager::gc_thread_compaction_manager(which);
280
281 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
282 _space_id,
283 _region_index_start,
284 _region_index_end);
285 }
286
287 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
288 assert(Universe::heap()->is_gc_active(), "called outside gc");
289
290 NOT_PRODUCT(TraceTime tm("DrainStacksCompactionTask",
291 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
292
293 ParCompactionManager* cm =
294 ParCompactionManager::gc_thread_compaction_manager(which);
295
296 // Process any regions already in the compaction managers stacks.
297 cm->drain_region_stacks();
298 }