1 /*
2 * Copyright (c) 2005, 2011, 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 jni_handles:
84 JNIHandles::oops_do(&mark_and_push_closure);
85 break;
86
87 case threads:
88 {
89 ResourceMark rm;
90 CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);
91 Threads::oops_do(&mark_and_push_closure, &each_active_code_blob);
92 }
93 break;
94
95 case object_synchronizer:
96 ObjectSynchronizer::oops_do(&mark_and_push_closure);
97 break;
98
99 case flat_profiler:
100 FlatProfiler::oops_do(&mark_and_push_closure);
101 break;
102
103 case management:
104 Management::oops_do(&mark_and_push_closure);
105 break;
106
107 case jvmti:
108 JvmtiExport::oops_do(&mark_and_push_closure);
109 break;
110
111 case system_dictionary:
112 SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
113 break;
114
115 case code_cache:
116 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
117 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
118 break;
119
120 default:
121 fatal("Unknown root type");
122 }
123
124 // Do the real work
125 cm->follow_marking_stacks();
126 }
127
128
129 //
130 // RefProcTaskProxy
131 //
132
133 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
134 {
135 assert(Universe::heap()->is_gc_active(), "called outside gc");
136
137 NOT_PRODUCT(TraceTime tm("RefProcTask",
138 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
139 ParCompactionManager* cm =
140 ParCompactionManager::gc_thread_compaction_manager(which);
141 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
142 PSParallelCompact::FollowStackClosure follow_stack_closure(cm);
143 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
144 mark_and_push_closure, follow_stack_closure);
145 }
146
147 //
148 // RefProcTaskExecutor
149 //
150
151 void RefProcTaskExecutor::execute(ProcessTask& task)
152 {
153 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
154 uint parallel_gc_threads = heap->gc_task_manager()->workers();
155 RegionTaskQueueSet* qset = ParCompactionManager::region_array();
156 ParallelTaskTerminator terminator(parallel_gc_threads, qset);
157 GCTaskQueue* q = GCTaskQueue::create();
158 for(uint i=0; i<parallel_gc_threads; i++) {
159 q->enqueue(new RefProcTaskProxy(task, i));
160 }
161 if (task.marks_oops_alive()) {
162 if (parallel_gc_threads>1) {
163 for (uint j=0; j<parallel_gc_threads; j++) {
164 q->enqueue(new StealMarkingTask(&terminator));
165 }
166 }
167 }
168 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
169 }
170
171 void RefProcTaskExecutor::execute(EnqueueTask& task)
172 {
173 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
174 uint parallel_gc_threads = heap->gc_task_manager()->workers();
175 GCTaskQueue* q = GCTaskQueue::create();
176 for(uint i=0; i<parallel_gc_threads; i++) {
177 q->enqueue(new RefEnqueueTaskProxy(task, i));
178 }
179 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
180 }
181
182 //
183 // StealMarkingTask
184 //
185
186 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
187 _terminator(t) {}
188
189 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
190 assert(Universe::heap()->is_gc_active(), "called outside gc");
191
192 NOT_PRODUCT(TraceTime tm("StealMarkingTask",
193 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
194
195 ParCompactionManager* cm =
196 ParCompactionManager::gc_thread_compaction_manager(which);
197 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
198
199 oop obj = NULL;
200 ObjArrayTask task;
201 int random_seed = 17;
202 do {
203 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
204 objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
205 k->oop_follow_contents(cm, task.obj(), task.index());
206 cm->follow_marking_stacks();
207 }
208 while (ParCompactionManager::steal(which, &random_seed, obj)) {
209 obj->follow_contents(cm);
210 cm->follow_marking_stacks();
211 }
212 } while (!terminator()->offer_termination());
213 }
214
215 //
216 // StealRegionCompactionTask
217 //
218
219
220 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
221 _terminator(t) {}
222
223 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
224 assert(Universe::heap()->is_gc_active(), "called outside gc");
225
226 NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask",
227 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
228
229 ParCompactionManager* cm =
230 ParCompactionManager::gc_thread_compaction_manager(which);
231
232 // Has to drain stacks first because there may be regions on
233 // preloaded onto the stack and this thread may never have
234 // done a draining task. Are the draining tasks needed?
235
236 cm->drain_region_stacks();
237
238 size_t region_index = 0;
239 int random_seed = 17;
240
241 // If we're the termination task, try 10 rounds of stealing before
242 // setting the termination flag
243
244 while(true) {
245 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
246 PSParallelCompact::fill_and_update_region(cm, region_index);
247 cm->drain_region_stacks();
248 } else {
249 if (terminator()->offer_termination()) {
250 break;
251 }
252 // Go around again.
253 }
254 }
255 return;
256 }
257
258 UpdateDensePrefixTask::UpdateDensePrefixTask(
259 PSParallelCompact::SpaceId space_id,
260 size_t region_index_start,
261 size_t region_index_end) :
262 _space_id(space_id), _region_index_start(region_index_start),
263 _region_index_end(region_index_end) {}
264
265 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
266
267 NOT_PRODUCT(TraceTime tm("UpdateDensePrefixTask",
268 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
269
270 ParCompactionManager* cm =
271 ParCompactionManager::gc_thread_compaction_manager(which);
272
273 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
274 _space_id,
275 _region_index_start,
276 _region_index_end);
277 }
278
279 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
280 assert(Universe::heap()->is_gc_active(), "called outside gc");
281
282 NOT_PRODUCT(TraceTime tm("DrainStacksCompactionTask",
283 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
284
285 ParCompactionManager* cm =
286 ParCompactionManager::gc_thread_compaction_manager(which);
287
288 // Process any regions already in the compaction managers stacks.
289 cm->drain_region_stacks();
290 }