1 /*
2 * Copyright (c) 2005, 2009, 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 "incls/_precompiled.incl"
26 # include "incls/_pcTasks.cpp.incl"
27
28 //
29 // ThreadRootsMarkingTask
30 //
31
32 void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
33 assert(Universe::heap()->is_gc_active(), "called outside gc");
34
35 ResourceMark rm;
36
37 NOT_PRODUCT(TraceTime tm("ThreadRootsMarkingTask",
38 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
39 ParCompactionManager* cm =
40 ParCompactionManager::gc_thread_compaction_manager(which);
41 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
42 CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true);
43
44 if (_java_thread != NULL)
45 _java_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);
46
47 if (_vm_thread != NULL)
48 _vm_thread->oops_do(&mark_and_push_closure, &mark_and_push_in_blobs);
49
50 // Do the real work
51 cm->follow_marking_stacks();
52 }
53
54
55 void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
56 assert(Universe::heap()->is_gc_active(), "called outside gc");
57
58 NOT_PRODUCT(TraceTime tm("MarkFromRootsTask",
59 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
60 ParCompactionManager* cm =
61 ParCompactionManager::gc_thread_compaction_manager(which);
62 assert(cm->stacks_have_been_allocated(),
63 "Stack space has not been allocated");
64 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
65
66 switch (_root_type) {
67 case universe:
68 Universe::oops_do(&mark_and_push_closure);
69 break;
70
71 case reference_processing:
72 ReferenceProcessor::oops_do(&mark_and_push_closure);
73 break;
74
75 case jni_handles:
76 JNIHandles::oops_do(&mark_and_push_closure);
77 break;
78
79 case threads:
80 {
81 ResourceMark rm;
82 CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);
83 Threads::oops_do(&mark_and_push_closure, &each_active_code_blob);
84 }
85 break;
86
87 case object_synchronizer:
88 ObjectSynchronizer::oops_do(&mark_and_push_closure);
89 break;
90
91 case flat_profiler:
92 FlatProfiler::oops_do(&mark_and_push_closure);
93 break;
94
95 case management:
96 Management::oops_do(&mark_and_push_closure);
97 break;
98
99 case jvmti:
100 JvmtiExport::oops_do(&mark_and_push_closure);
101 break;
102
103 case system_dictionary:
104 SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
105 break;
106
107 case vm_symbols:
108 vmSymbols::oops_do(&mark_and_push_closure);
109 break;
110
111 case code_cache:
112 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
113 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
114 break;
115
116 default:
117 fatal("Unknown root type");
118 }
119
120 // Do the real work
121 cm->follow_marking_stacks();
122 // cm->deallocate_stacks();
123 }
124
125
126 //
127 // RefProcTaskProxy
128 //
129
130 void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
131 {
132 assert(Universe::heap()->is_gc_active(), "called outside gc");
133
134 NOT_PRODUCT(TraceTime tm("RefProcTask",
135 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
136 ParCompactionManager* cm =
137 ParCompactionManager::gc_thread_compaction_manager(which);
138 assert(cm->stacks_have_been_allocated(),
139 "Stack space has not been allocated");
140 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
141 PSParallelCompact::FollowStackClosure follow_stack_closure(cm);
142 _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
143 mark_and_push_closure, follow_stack_closure);
144 }
145
146 //
147 // RefProcTaskExecutor
148 //
149
150 void RefProcTaskExecutor::execute(ProcessTask& task)
151 {
152 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
153 uint parallel_gc_threads = heap->gc_task_manager()->workers();
154 RegionTaskQueueSet* qset = ParCompactionManager::region_array();
155 ParallelTaskTerminator terminator(parallel_gc_threads, qset);
156 GCTaskQueue* q = GCTaskQueue::create();
157 for(uint i=0; i<parallel_gc_threads; i++) {
158 q->enqueue(new RefProcTaskProxy(task, i));
159 }
160 if (task.marks_oops_alive()) {
161 if (parallel_gc_threads>1) {
162 for (uint j=0; j<parallel_gc_threads; j++) {
163 q->enqueue(new StealMarkingTask(&terminator));
164 }
165 }
166 }
167 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
168 }
169
170 void RefProcTaskExecutor::execute(EnqueueTask& task)
171 {
172 ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
173 uint parallel_gc_threads = heap->gc_task_manager()->workers();
174 GCTaskQueue* q = GCTaskQueue::create();
175 for(uint i=0; i<parallel_gc_threads; i++) {
176 q->enqueue(new RefEnqueueTaskProxy(task, i));
177 }
178 PSParallelCompact::gc_task_manager()->execute_and_wait(q);
179 }
180
181 //
182 // StealMarkingTask
183 //
184
185 StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
186 _terminator(t) {}
187
188 void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
189 assert(Universe::heap()->is_gc_active(), "called outside gc");
190
191 NOT_PRODUCT(TraceTime tm("StealMarkingTask",
192 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
193
194 ParCompactionManager* cm =
195 ParCompactionManager::gc_thread_compaction_manager(which);
196 PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
197
198 oop obj = NULL;
199 ObjArrayTask task;
200 int random_seed = 17;
201 do {
202 while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
203 objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
204 k->oop_follow_contents(cm, task.obj(), task.index());
205 cm->follow_marking_stacks();
206 }
207 while (ParCompactionManager::steal(which, &random_seed, obj)) {
208 obj->follow_contents(cm);
209 cm->follow_marking_stacks();
210 }
211 } while (!terminator()->offer_termination());
212 }
213
214 //
215 // StealRegionCompactionTask
216 //
217
218
219 StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
220 _terminator(t) {}
221
222 void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
223 assert(Universe::heap()->is_gc_active(), "called outside gc");
224
225 NOT_PRODUCT(TraceTime tm("StealRegionCompactionTask",
226 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
227
228 ParCompactionManager* cm =
229 ParCompactionManager::gc_thread_compaction_manager(which);
230
231 // Has to drain stacks first because there may be regions on
232 // preloaded onto the stack and this thread may never have
233 // done a draining task. Are the draining tasks needed?
234
235 cm->drain_region_stacks();
236
237 size_t region_index = 0;
238 int random_seed = 17;
239
240 // If we're the termination task, try 10 rounds of stealing before
241 // setting the termination flag
242
243 while(true) {
244 if (ParCompactionManager::steal(which, &random_seed, region_index)) {
245 PSParallelCompact::fill_and_update_region(cm, region_index);
246 cm->drain_region_stacks();
247 } else {
248 if (terminator()->offer_termination()) {
249 break;
250 }
251 // Go around again.
252 }
253 }
254 return;
255 }
256
257 UpdateDensePrefixTask::UpdateDensePrefixTask(
258 PSParallelCompact::SpaceId space_id,
259 size_t region_index_start,
260 size_t region_index_end) :
261 _space_id(space_id), _region_index_start(region_index_start),
262 _region_index_end(region_index_end) {}
263
264 void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
265
266 NOT_PRODUCT(TraceTime tm("UpdateDensePrefixTask",
267 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
268
269 ParCompactionManager* cm =
270 ParCompactionManager::gc_thread_compaction_manager(which);
271
272 PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
273 _space_id,
274 _region_index_start,
275 _region_index_end);
276 }
277
278 void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
279 assert(Universe::heap()->is_gc_active(), "called outside gc");
280
281 NOT_PRODUCT(TraceTime tm("DrainStacksCompactionTask",
282 PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
283
284 ParCompactionManager* cm =
285 ParCompactionManager::gc_thread_compaction_manager(which);
286
287 // Process any regions already in the compaction managers stacks.
288 cm->drain_region_stacks();
289 }