Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/pcTasks.hpp @ 10361:eda078b01c65
8015268: NPG: 2.5% regression in young GC times on CRM Sales Opty
Summary: Split SystemDictionary and ClassLoaderDataGraph root processing to help load balancing.
Reviewed-by: tschatzl, johnc
| author | stefank |
|---|---|
| date | Mon, 27 May 2013 15:22:59 +0200 |
| parents | c2bf0120ee5d |
| children | de6a9e811145 |
| rev | line source |
|---|---|
| 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 class_loader_data = 9, |
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102 code_cache = 10 |
| 0 | 103 }; |
| 104 private: | |
| 105 RootType _root_type; | |
| 106 public: | |
| 107 MarkFromRootsTask(RootType value) : _root_type(value) {} | |
| 108 | |
| 109 char* name() { return (char *)"mark-from-roots-task"; } | |
| 110 | |
| 111 virtual void do_it(GCTaskManager* manager, uint which); | |
| 112 }; | |
| 113 | |
| 114 // | |
| 115 // RefProcTaskProxy | |
| 116 // | |
| 117 // This task is used as a proxy to parallel reference processing tasks . | |
| 118 // | |
| 119 | |
| 120 class RefProcTaskProxy : public GCTask { | |
| 121 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
| 122 ProcessTask & _rp_task; | |
| 123 uint _work_id; | |
| 124 public: | |
| 125 RefProcTaskProxy(ProcessTask & rp_task, uint work_id) | |
| 126 : _rp_task(rp_task), | |
| 127 _work_id(work_id) | |
| 128 { } | |
| 129 | |
| 130 private: | |
| 131 virtual char* name() { return (char *)"Process referents by policy in parallel"; } | |
| 132 | |
| 133 virtual void do_it(GCTaskManager* manager, uint which); | |
| 134 }; | |
| 135 | |
| 136 | |
| 137 | |
| 138 // | |
| 139 // RefEnqueueTaskProxy | |
| 140 // | |
| 141 // This task is used as a proxy to parallel reference processing tasks . | |
| 142 // | |
| 143 | |
| 144 class RefEnqueueTaskProxy: public GCTask { | |
| 145 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
| 146 EnqueueTask& _enq_task; | |
| 147 uint _work_id; | |
| 148 | |
| 149 public: | |
| 150 RefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) | |
| 151 : _enq_task(enq_task), | |
| 152 _work_id(work_id) | |
| 153 { } | |
| 154 | |
| 155 virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } | |
| 156 virtual void do_it(GCTaskManager* manager, uint which) | |
| 157 { | |
| 158 _enq_task.work(_work_id); | |
| 159 } | |
| 160 }; | |
| 161 | |
| 162 | |
| 163 // | |
| 164 // RefProcTaskExecutor | |
| 165 // | |
| 166 // Task executor is an interface for the reference processor to run | |
| 167 // tasks using GCTaskManager. | |
| 168 // | |
| 169 | |
| 170 class RefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
| 171 virtual void execute(ProcessTask& task); | |
| 172 virtual void execute(EnqueueTask& task); | |
| 173 }; | |
| 174 | |
| 175 | |
| 176 // | |
| 177 // StealMarkingTask | |
| 178 // | |
| 179 // This task is used to distribute work to idle threads. | |
| 180 // | |
| 181 | |
| 182 class StealMarkingTask : public GCTask { | |
| 183 private: | |
| 184 ParallelTaskTerminator* const _terminator; | |
| 185 private: | |
| 186 | |
| 187 public: | |
| 188 char* name() { return (char *)"steal-marking-task"; } | |
| 189 | |
| 190 StealMarkingTask(ParallelTaskTerminator* t); | |
| 191 | |
| 192 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 193 | |
| 194 virtual void do_it(GCTaskManager* manager, uint which); | |
| 195 }; | |
| 196 | |
| 197 // | |
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198 // StealRegionCompactionTask |
| 0 | 199 // |
| 200 // This task is used to distribute work to idle threads. | |
| 201 // | |
| 202 | |
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203 class StealRegionCompactionTask : public GCTask { |
| 0 | 204 private: |
| 205 ParallelTaskTerminator* const _terminator; | |
| 206 public: | |
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207 StealRegionCompactionTask(ParallelTaskTerminator* t); |
| 0 | 208 |
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209 char* name() { return (char *)"steal-region-task"; } |
| 0 | 210 ParallelTaskTerminator* terminator() { return _terminator; } |
| 211 | |
| 212 virtual void do_it(GCTaskManager* manager, uint which); | |
| 213 }; | |
| 214 | |
| 215 // | |
| 216 // UpdateDensePrefixTask | |
| 217 // | |
| 218 // This task is used to update the dense prefix | |
| 219 // of a space. | |
| 220 // | |
| 221 | |
| 222 class UpdateDensePrefixTask : public GCTask { | |
| 223 private: | |
| 224 PSParallelCompact::SpaceId _space_id; | |
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225 size_t _region_index_start; |
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226 size_t _region_index_end; |
| 0 | 227 |
| 228 public: | |
| 229 char* name() { return (char *)"update-dense_prefix-task"; } | |
| 230 | |
| 231 UpdateDensePrefixTask(PSParallelCompact::SpaceId space_id, | |
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232 size_t region_index_start, |
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233 size_t region_index_end); |
| 0 | 234 |
| 235 virtual void do_it(GCTaskManager* manager, uint which); | |
| 236 }; | |
| 237 | |
| 238 // | |
| 239 // DrainStacksCompactionTask | |
| 240 // | |
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241 // This task processes regions that have been added to the stacks of each |
| 0 | 242 // compaction manager. |
| 243 // | |
| 244 // Trying to use one draining thread does not work because there are no | |
| 245 // guarantees about which task will be picked up by which thread. For example, | |
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246 // if thread A gets all the preloaded regions, thread A may not get a draining |
| 0 | 247 // task (they may all be done by other threads). |
| 248 // | |
| 249 | |
| 250 class DrainStacksCompactionTask : public GCTask { | |
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251 uint _stack_index; |
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252 uint stack_index() { return _stack_index; } |
| 0 | 253 public: |
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254 DrainStacksCompactionTask(uint stack_index) : GCTask(), |
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255 _stack_index(stack_index) {}; |
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256 char* name() { return (char *)"drain-region-task"; } |
| 0 | 257 virtual void do_it(GCTaskManager* manager, uint which); |
| 258 }; | |
| 1972 | 259 |
| 260 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PCTASKS_HPP |