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