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annotate src/share/vm/gc_implementation/parallelScavenge/pcTasks.hpp @ 8090:2af22eb04623
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author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PCTASKS_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PCTASKS_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
29 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
30 #include "gc_implementation/parallelScavenge/psTasks.hpp" | |
31 | |
0 | 32 |
33 // Tasks for parallel compaction of the old generation | |
34 // | |
35 // Tasks are created and enqueued on a task queue. The | |
36 // tasks for parallel old collector for marking objects | |
37 // are MarkFromRootsTask and ThreadRootsMarkingTask. | |
38 // | |
39 // MarkFromRootsTask's are created | |
40 // with a root group (e.g., jni_handles) and when the do_it() | |
41 // method of a MarkFromRootsTask is executed, it starts marking | |
42 // form it's root group. | |
43 // | |
44 // ThreadRootsMarkingTask's are created for each Java thread. When | |
45 // the do_it() method of a ThreadRootsMarkingTask is executed, it | |
46 // starts marking from the thread's roots. | |
47 // | |
48 // The enqueuing of the MarkFromRootsTask and ThreadRootsMarkingTask | |
49 // do little more than create the task and put it on a queue. The | |
50 // queue is a GCTaskQueue and threads steal tasks from this GCTaskQueue. | |
51 // | |
52 // In addition to the MarkFromRootsTask and ThreadRootsMarkingTask | |
53 // tasks there are StealMarkingTask tasks. The StealMarkingTask's | |
54 // steal a reference from the marking stack of another | |
55 // thread and transitively marks the object of the reference | |
56 // and internal references. After successfully stealing a reference | |
57 // and marking it, the StealMarkingTask drains its marking stack | |
58 // stack before attempting another steal. | |
59 // | |
60 // ThreadRootsMarkingTask | |
61 // | |
62 // This task marks from the roots of a single thread. This task | |
63 // enables marking of thread roots in parallel. | |
64 // | |
65 | |
66 class ParallelTaskTerminator; | |
67 | |
68 class ThreadRootsMarkingTask : public GCTask { | |
69 private: | |
70 JavaThread* _java_thread; | |
71 VMThread* _vm_thread; | |
72 public: | |
73 ThreadRootsMarkingTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {} | |
74 ThreadRootsMarkingTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {} | |
75 | |
76 char* name() { return (char *)"thread-roots-marking-task"; } | |
77 | |
78 virtual void do_it(GCTaskManager* manager, uint which); | |
79 }; | |
80 | |
81 | |
82 // | |
83 // MarkFromRootsTask | |
84 // | |
85 // This task marks from all the roots to all live | |
86 // objects. | |
87 // | |
88 // | |
89 | |
90 class MarkFromRootsTask : public GCTask { | |
91 public: | |
92 enum RootType { | |
93 universe = 1, | |
94 jni_handles = 2, | |
95 threads = 3, | |
96 object_synchronizer = 4, | |
97 flat_profiler = 5, | |
98 management = 6, | |
99 jvmti = 7, | |
100 system_dictionary = 8, | |
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101 code_cache = 9 |
0 | 102 }; |
103 private: | |
104 RootType _root_type; | |
105 public: | |
106 MarkFromRootsTask(RootType value) : _root_type(value) {} | |
107 | |
108 char* name() { return (char *)"mark-from-roots-task"; } | |
109 | |
110 virtual void do_it(GCTaskManager* manager, uint which); | |
111 }; | |
112 | |
113 // | |
114 // RefProcTaskProxy | |
115 // | |
116 // This task is used as a proxy to parallel reference processing tasks . | |
117 // | |
118 | |
119 class RefProcTaskProxy : public GCTask { | |
120 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
121 ProcessTask & _rp_task; | |
122 uint _work_id; | |
123 public: | |
124 RefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
125 : _rp_task(rp_task), | |
126 _work_id(work_id) | |
127 { } | |
128 | |
129 private: | |
130 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
131 | |
132 virtual void do_it(GCTaskManager* manager, uint which); | |
133 }; | |
134 | |
135 | |
136 | |
137 // | |
138 // RefEnqueueTaskProxy | |
139 // | |
140 // This task is used as a proxy to parallel reference processing tasks . | |
141 // | |
142 | |
143 class RefEnqueueTaskProxy: public GCTask { | |
144 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
145 EnqueueTask& _enq_task; | |
146 uint _work_id; | |
147 | |
148 public: | |
149 RefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
150 : _enq_task(enq_task), | |
151 _work_id(work_id) | |
152 { } | |
153 | |
154 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
155 virtual void do_it(GCTaskManager* manager, uint which) | |
156 { | |
157 _enq_task.work(_work_id); | |
158 } | |
159 }; | |
160 | |
161 | |
162 // | |
163 // RefProcTaskExecutor | |
164 // | |
165 // Task executor is an interface for the reference processor to run | |
166 // tasks using GCTaskManager. | |
167 // | |
168 | |
169 class RefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
170 virtual void execute(ProcessTask& task); | |
171 virtual void execute(EnqueueTask& task); | |
172 }; | |
173 | |
174 | |
175 // | |
176 // StealMarkingTask | |
177 // | |
178 // This task is used to distribute work to idle threads. | |
179 // | |
180 | |
181 class StealMarkingTask : public GCTask { | |
182 private: | |
183 ParallelTaskTerminator* const _terminator; | |
184 private: | |
185 | |
186 public: | |
187 char* name() { return (char *)"steal-marking-task"; } | |
188 | |
189 StealMarkingTask(ParallelTaskTerminator* t); | |
190 | |
191 ParallelTaskTerminator* terminator() { return _terminator; } | |
192 | |
193 virtual void do_it(GCTaskManager* manager, uint which); | |
194 }; | |
195 | |
196 // | |
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197 // StealRegionCompactionTask |
0 | 198 // |
199 // This task is used to distribute work to idle threads. | |
200 // | |
201 | |
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202 class StealRegionCompactionTask : public GCTask { |
0 | 203 private: |
204 ParallelTaskTerminator* const _terminator; | |
205 public: | |
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206 StealRegionCompactionTask(ParallelTaskTerminator* t); |
0 | 207 |
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208 char* name() { return (char *)"steal-region-task"; } |
0 | 209 ParallelTaskTerminator* terminator() { return _terminator; } |
210 | |
211 virtual void do_it(GCTaskManager* manager, uint which); | |
212 }; | |
213 | |
214 // | |
215 // UpdateDensePrefixTask | |
216 // | |
217 // This task is used to update the dense prefix | |
218 // of a space. | |
219 // | |
220 | |
221 class UpdateDensePrefixTask : public GCTask { | |
222 private: | |
223 PSParallelCompact::SpaceId _space_id; | |
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224 size_t _region_index_start; |
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225 size_t _region_index_end; |
0 | 226 |
227 public: | |
228 char* name() { return (char *)"update-dense_prefix-task"; } | |
229 | |
230 UpdateDensePrefixTask(PSParallelCompact::SpaceId space_id, | |
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231 size_t region_index_start, |
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232 size_t region_index_end); |
0 | 233 |
234 virtual void do_it(GCTaskManager* manager, uint which); | |
235 }; | |
236 | |
237 // | |
238 // DrainStacksCompactionTask | |
239 // | |
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240 // This task processes regions that have been added to the stacks of each |
0 | 241 // compaction manager. |
242 // | |
243 // Trying to use one draining thread does not work because there are no | |
244 // guarantees about which task will be picked up by which thread. For example, | |
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245 // if thread A gets all the preloaded regions, thread A may not get a draining |
0 | 246 // task (they may all be done by other threads). |
247 // | |
248 | |
249 class DrainStacksCompactionTask : public GCTask { | |
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250 uint _stack_index; |
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251 uint stack_index() { return _stack_index; } |
0 | 252 public: |
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253 DrainStacksCompactionTask(uint stack_index) : GCTask(), |
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254 _stack_index(stack_index) {}; |
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255 char* name() { return (char *)"drain-region-task"; } |
0 | 256 virtual void do_it(GCTaskManager* manager, uint which); |
257 }; | |
1972 | 258 |
259 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PCTASKS_HPP |