Mercurial > hg > graal-jvmci-8
annotate src/share/vm/utilities/workgroup.hpp @ 1833:8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
Summary: Associate number of GC workers with the workgang as opposed to the task.
Reviewed-by: johnc, ysr
| author | jmasa |
|---|---|
| date | Mon, 20 Sep 2010 14:38:38 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2002, 2010, 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 | |
| 25 // Forward declarations of classes defined here | |
| 26 | |
| 27 class WorkGang; | |
| 28 class GangWorker; | |
| 29 class YieldingFlexibleGangWorker; | |
| 30 class YieldingFlexibleGangTask; | |
| 31 class WorkData; | |
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32 class AbstractWorkGang; |
| 0 | 33 |
| 34 // An abstract task to be worked on by a gang. | |
| 35 // You subclass this to supply your own work() method | |
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36 class AbstractGangTask VALUE_OBJ_CLASS_SPEC { |
| 0 | 37 public: |
| 38 // The abstract work method. | |
| 39 // The argument tells you which member of the gang you are. | |
| 40 virtual void work(int i) = 0; | |
| 41 | |
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42 // This method configures the task for proper termination. |
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43 // Some tasks do not have any requirements on termination |
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44 // and may inherit this method that does nothing. Some |
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45 // tasks do some coordination on termination and override |
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46 // this method to implement that coordination. |
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47 virtual void set_for_termination(int active_workers) {}; |
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48 |
| 0 | 49 // Debugging accessor for the name. |
| 50 const char* name() const PRODUCT_RETURN_(return NULL;); | |
| 51 int counter() { return _counter; } | |
| 52 void set_counter(int value) { _counter = value; } | |
| 53 int *address_of_counter() { return &_counter; } | |
| 54 | |
| 55 // RTTI | |
| 56 NOT_PRODUCT(virtual bool is_YieldingFlexibleGang_task() const { | |
| 57 return false; | |
| 58 }) | |
| 59 | |
| 60 private: | |
| 61 NOT_PRODUCT(const char* _name;) | |
| 62 // ??? Should a task have a priority associated with it? | |
| 63 // ??? Or can the run method adjust priority as needed? | |
| 64 int _counter; | |
| 65 | |
| 66 protected: | |
| 67 // Constructor and desctructor: only construct subclasses. | |
| 68 AbstractGangTask(const char* name) { | |
| 69 NOT_PRODUCT(_name = name); | |
| 70 _counter = 0; | |
| 71 } | |
| 72 virtual ~AbstractGangTask() { } | |
| 73 }; | |
| 74 | |
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75 class AbstractGangTaskWOopQueues : public AbstractGangTask { |
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76 OopTaskQueueSet* _queues; |
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77 ParallelTaskTerminator _terminator; |
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78 public: |
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79 AbstractGangTaskWOopQueues(const char* name, OopTaskQueueSet* queues) : |
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80 AbstractGangTask(name), _queues(queues), _terminator(0, _queues) {} |
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81 ParallelTaskTerminator* terminator() { return &_terminator; } |
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82 virtual void set_for_termination(int active_workers) { |
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83 terminator()->reset_for_reuse(active_workers); |
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84 } |
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85 OopTaskQueueSet* queues() { return _queues; } |
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86 }; |
| 0 | 87 |
| 88 // Class AbstractWorkGang: | |
| 89 // An abstract class representing a gang of workers. | |
| 90 // You subclass this to supply an implementation of run_task(). | |
| 91 class AbstractWorkGang: public CHeapObj { | |
| 92 // Here's the public interface to this class. | |
| 93 public: | |
| 94 // Constructor and destructor. | |
| 342 | 95 AbstractWorkGang(const char* name, bool are_GC_task_threads, |
| 96 bool are_ConcurrentGC_threads); | |
| 0 | 97 ~AbstractWorkGang(); |
| 98 // Run a task, returns when the task is done (or terminated). | |
| 99 virtual void run_task(AbstractGangTask* task) = 0; | |
| 100 // Stop and terminate all workers. | |
| 101 virtual void stop(); | |
| 102 public: | |
| 103 // Debugging. | |
| 104 const char* name() const; | |
| 105 protected: | |
| 106 // Initialize only instance data. | |
| 342 | 107 const bool _are_GC_task_threads; |
| 108 const bool _are_ConcurrentGC_threads; | |
| 0 | 109 // Printing support. |
| 110 const char* _name; | |
| 111 // The monitor which protects these data, | |
| 112 // and notifies of changes in it. | |
| 113 Monitor* _monitor; | |
| 114 // The count of the number of workers in the gang. | |
| 115 int _total_workers; | |
| 116 // Whether the workers should terminate. | |
| 117 bool _terminate; | |
| 118 // The array of worker threads for this gang. | |
| 119 // This is only needed for cleaning up. | |
| 120 GangWorker** _gang_workers; | |
| 121 // The task for this gang. | |
| 122 AbstractGangTask* _task; | |
| 123 // A sequence number for the current task. | |
| 124 int _sequence_number; | |
| 125 // The number of started workers. | |
| 126 int _started_workers; | |
| 127 // The number of finished workers. | |
| 128 int _finished_workers; | |
| 129 public: | |
| 130 // Accessors for fields | |
| 131 Monitor* monitor() const { | |
| 132 return _monitor; | |
| 133 } | |
| 134 int total_workers() const { | |
| 135 return _total_workers; | |
| 136 } | |
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137 virtual int active_workers() const { |
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138 return _total_workers; |
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139 } |
| 0 | 140 bool terminate() const { |
| 141 return _terminate; | |
| 142 } | |
| 143 GangWorker** gang_workers() const { | |
| 144 return _gang_workers; | |
| 145 } | |
| 146 AbstractGangTask* task() const { | |
| 147 return _task; | |
| 148 } | |
| 149 int sequence_number() const { | |
| 150 return _sequence_number; | |
| 151 } | |
| 152 int started_workers() const { | |
| 153 return _started_workers; | |
| 154 } | |
| 155 int finished_workers() const { | |
| 156 return _finished_workers; | |
| 157 } | |
| 342 | 158 bool are_GC_task_threads() const { |
| 159 return _are_GC_task_threads; | |
| 160 } | |
| 161 bool are_ConcurrentGC_threads() const { | |
| 162 return _are_ConcurrentGC_threads; | |
| 0 | 163 } |
| 164 // Predicates. | |
| 165 bool is_idle() const { | |
| 166 return (task() == NULL); | |
| 167 } | |
| 168 // Return the Ith gang worker. | |
| 169 GangWorker* gang_worker(int i) const; | |
| 170 | |
| 171 void threads_do(ThreadClosure* tc) const; | |
| 172 | |
| 173 // Printing | |
| 174 void print_worker_threads_on(outputStream *st) const; | |
| 175 void print_worker_threads() const { | |
| 176 print_worker_threads_on(tty); | |
| 177 } | |
| 178 | |
| 179 protected: | |
| 180 friend class GangWorker; | |
| 181 friend class YieldingFlexibleGangWorker; | |
| 182 // Note activation and deactivation of workers. | |
| 183 // These methods should only be called with the mutex held. | |
| 184 void internal_worker_poll(WorkData* data) const; | |
| 185 void internal_note_start(); | |
| 186 void internal_note_finish(); | |
| 187 }; | |
| 188 | |
| 189 class WorkData: public StackObj { | |
| 190 // This would be a struct, but I want accessor methods. | |
| 191 private: | |
| 192 bool _terminate; | |
| 193 AbstractGangTask* _task; | |
| 194 int _sequence_number; | |
| 195 public: | |
| 196 // Constructor and destructor | |
| 197 WorkData() { | |
| 198 _terminate = false; | |
| 199 _task = NULL; | |
| 200 _sequence_number = 0; | |
| 201 } | |
| 202 ~WorkData() { | |
| 203 } | |
| 204 // Accessors and modifiers | |
| 205 bool terminate() const { return _terminate; } | |
| 206 void set_terminate(bool value) { _terminate = value; } | |
| 207 AbstractGangTask* task() const { return _task; } | |
| 208 void set_task(AbstractGangTask* value) { _task = value; } | |
| 209 int sequence_number() const { return _sequence_number; } | |
| 210 void set_sequence_number(int value) { _sequence_number = value; } | |
| 211 | |
| 212 YieldingFlexibleGangTask* yf_task() const { | |
| 213 return (YieldingFlexibleGangTask*)_task; | |
| 214 } | |
| 215 }; | |
| 216 | |
| 217 // Class WorkGang: | |
| 218 class WorkGang: public AbstractWorkGang { | |
| 219 public: | |
| 220 // Constructor | |
| 342 | 221 WorkGang(const char* name, int workers, |
| 222 bool are_GC_task_threads, bool are_ConcurrentGC_threads); | |
| 0 | 223 // Run a task, returns when the task is done (or terminated). |
| 224 virtual void run_task(AbstractGangTask* task); | |
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225 void run_task(AbstractGangTask* task, uint no_of_parallel_workers); |
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226 // Allocate a worker and return a pointer to it. |
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227 virtual GangWorker* allocate_worker(int which); |
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228 // Initialize workers in the gang. Return true if initialization |
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229 // succeeded. The type of the worker can be overridden in a derived |
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230 // class with the appropriate implementation of allocate_worker(). |
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231 bool initialize_workers(); |
| 0 | 232 }; |
| 233 | |
| 234 // Class GangWorker: | |
| 235 // Several instances of this class run in parallel as workers for a gang. | |
| 236 class GangWorker: public WorkerThread { | |
| 237 public: | |
| 238 // Constructors and destructor. | |
| 239 GangWorker(AbstractWorkGang* gang, uint id); | |
| 240 | |
| 241 // The only real method: run a task for the gang. | |
| 242 virtual void run(); | |
| 243 // Predicate for Thread | |
| 244 virtual bool is_GC_task_thread() const; | |
| 342 | 245 virtual bool is_ConcurrentGC_thread() const; |
| 0 | 246 // Printing |
| 247 void print_on(outputStream* st) const; | |
| 248 virtual void print() const { print_on(tty); } | |
| 249 protected: | |
| 250 AbstractWorkGang* _gang; | |
| 251 | |
| 252 virtual void initialize(); | |
| 253 virtual void loop(); | |
| 254 | |
| 255 public: | |
| 256 AbstractWorkGang* gang() const { return _gang; } | |
| 257 }; | |
| 258 | |
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259 class FlexibleWorkGang: public WorkGang { |
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260 protected: |
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261 int _active_workers; |
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262 public: |
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263 // Constructor and destructor. |
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264 FlexibleWorkGang(const char* name, int workers, |
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265 bool are_GC_task_threads, |
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266 bool are_ConcurrentGC_threads) : |
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267 WorkGang(name, workers, are_GC_task_threads, are_ConcurrentGC_threads) { |
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268 _active_workers = ParallelGCThreads; |
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269 }; |
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270 // Accessors for fields |
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271 virtual int active_workers() const { return _active_workers; } |
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272 void set_active_workers(int v) { _active_workers = v; } |
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273 }; |
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274 |
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275 // Work gangs in garbage collectors: 2009-06-10 |
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276 // |
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277 // SharedHeap - work gang for stop-the-world parallel collection. |
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278 // Used by |
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279 // ParNewGeneration |
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280 // CMSParRemarkTask |
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281 // CMSRefProcTaskExecutor |
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282 // G1CollectedHeap |
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283 // G1ParFinalCountTask |
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284 // ConcurrentMark |
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285 // CMSCollector |
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286 |
| 0 | 287 // A class that acts as a synchronisation barrier. Workers enter |
| 288 // the barrier and must wait until all other workers have entered | |
| 289 // before any of them may leave. | |
| 290 | |
| 291 class WorkGangBarrierSync : public StackObj { | |
| 292 protected: | |
| 293 Monitor _monitor; | |
| 294 int _n_workers; | |
| 295 int _n_completed; | |
| 342 | 296 bool _should_reset; |
| 0 | 297 |
| 342 | 298 Monitor* monitor() { return &_monitor; } |
| 299 int n_workers() { return _n_workers; } | |
| 300 int n_completed() { return _n_completed; } | |
| 301 bool should_reset() { return _should_reset; } | |
| 0 | 302 |
| 342 | 303 void zero_completed() { _n_completed = 0; } |
| 304 void inc_completed() { _n_completed++; } | |
| 305 | |
| 306 void set_should_reset(bool v) { _should_reset = v; } | |
| 0 | 307 |
| 308 public: | |
| 309 WorkGangBarrierSync(); | |
| 310 WorkGangBarrierSync(int n_workers, const char* name); | |
| 311 | |
| 312 // Set the number of workers that will use the barrier. | |
| 313 // Must be called before any of the workers start running. | |
| 314 void set_n_workers(int n_workers); | |
| 315 | |
| 316 // Enter the barrier. A worker that enters the barrier will | |
| 317 // not be allowed to leave until all other threads have | |
| 318 // also entered the barrier. | |
| 319 void enter(); | |
| 320 }; | |
| 321 | |
| 322 // A class to manage claiming of subtasks within a group of tasks. The | |
| 323 // subtasks will be identified by integer indices, usually elements of an | |
| 324 // enumeration type. | |
| 325 | |
| 326 class SubTasksDone: public CHeapObj { | |
| 327 jint* _tasks; | |
| 328 int _n_tasks; | |
| 329 int _n_threads; | |
| 330 jint _threads_completed; | |
| 331 #ifdef ASSERT | |
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332 volatile jint _claimed; |
| 0 | 333 #endif |
| 334 | |
| 335 // Set all tasks to unclaimed. | |
| 336 void clear(); | |
| 337 | |
| 338 public: | |
| 339 // Initializes "this" to a state in which there are "n" tasks to be | |
| 340 // processed, none of the which are originally claimed. The number of | |
| 341 // threads doing the tasks is initialized 1. | |
| 342 SubTasksDone(int n); | |
| 343 | |
| 344 // True iff the object is in a valid state. | |
| 345 bool valid(); | |
| 346 | |
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347 // Get/set the number of parallel threads doing the tasks to "t". Can only |
| 0 | 348 // be called before tasks start or after they are complete. |
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349 int n_threads() { return _n_threads; } |
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350 void set_n_threads(int t); |
| 0 | 351 |
| 352 // Returns "false" if the task "t" is unclaimed, and ensures that task is | |
| 353 // claimed. The task "t" is required to be within the range of "this". | |
| 354 bool is_task_claimed(int t); | |
| 355 | |
| 356 // The calling thread asserts that it has attempted to claim all the | |
| 357 // tasks that it will try to claim. Every thread in the parallel task | |
| 358 // must execute this. (When the last thread does so, the task array is | |
| 359 // cleared.) | |
| 360 void all_tasks_completed(); | |
| 361 | |
| 362 // Destructor. | |
| 363 ~SubTasksDone(); | |
| 364 }; | |
| 365 | |
| 366 // As above, but for sequential tasks, i.e. instead of claiming | |
| 367 // sub-tasks from a set (possibly an enumeration), claim sub-tasks | |
| 368 // in sequential order. This is ideal for claiming dynamically | |
| 369 // partitioned tasks (like striding in the parallel remembered | |
| 370 // set scanning). Note that unlike the above class this is | |
| 371 // a stack object - is there any reason for it not to be? | |
| 372 | |
| 373 class SequentialSubTasksDone : public StackObj { | |
| 374 protected: | |
| 375 jint _n_tasks; // Total number of tasks available. | |
| 376 jint _n_claimed; // Number of tasks claimed. | |
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377 // _n_threads is used to determine when a sub task is done. |
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378 // See comments on SubTasksDone::_n_threads |
| 0 | 379 jint _n_threads; // Total number of parallel threads. |
| 380 jint _n_completed; // Number of completed threads. | |
| 381 | |
| 382 void clear(); | |
| 383 | |
| 384 public: | |
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385 SequentialSubTasksDone() { |
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386 clear(); |
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387 } |
| 0 | 388 ~SequentialSubTasksDone() {} |
| 389 | |
| 390 // True iff the object is in a valid state. | |
| 391 bool valid(); | |
| 392 | |
| 393 // number of tasks | |
| 394 jint n_tasks() const { return _n_tasks; } | |
| 395 | |
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396 // Get/set the number of parallel threads doing the tasks to t. |
| 0 | 397 // Should be called before the task starts but it is safe |
| 398 // to call this once a task is running provided that all | |
| 399 // threads agree on the number of threads. | |
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400 int n_threads() { return _n_threads; } |
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401 void set_n_threads(int t) { _n_threads = t; } |
| 0 | 402 |
| 403 // Set the number of tasks to be claimed to t. As above, | |
| 404 // should be called before the tasks start but it is safe | |
| 405 // to call this once a task is running provided all threads | |
| 406 // agree on the number of tasks. | |
| 407 void set_n_tasks(int t) { _n_tasks = t; } | |
| 408 | |
| 409 // Returns false if the next task in the sequence is unclaimed, | |
| 410 // and ensures that it is claimed. Will set t to be the index | |
| 411 // of the claimed task in the sequence. Will return true if | |
| 412 // the task cannot be claimed and there are none left to claim. | |
| 413 bool is_task_claimed(int& t); | |
| 414 | |
| 415 // The calling thread asserts that it has attempted to claim | |
| 416 // all the tasks it possibly can in the sequence. Every thread | |
| 417 // claiming tasks must promise call this. Returns true if this | |
| 418 // is the last thread to complete so that the thread can perform | |
| 419 // cleanup if necessary. | |
| 420 bool all_tasks_completed(); | |
| 421 }; | |
| 342 | 422 |
| 423 // Represents a set of free small integer ids. | |
| 424 class FreeIdSet { | |
| 425 enum { | |
| 426 end_of_list = -1, | |
| 427 claimed = -2 | |
| 428 }; | |
| 429 | |
| 430 int _sz; | |
| 431 Monitor* _mon; | |
| 432 | |
| 433 int* _ids; | |
| 434 int _hd; | |
| 435 int _waiters; | |
| 436 int _claimed; | |
| 437 | |
| 438 static bool _safepoint; | |
| 439 typedef FreeIdSet* FreeIdSetPtr; | |
| 440 static const int NSets = 10; | |
| 441 static FreeIdSetPtr _sets[NSets]; | |
| 442 static bool _stat_init; | |
| 443 int _index; | |
| 444 | |
| 445 public: | |
| 446 FreeIdSet(int sz, Monitor* mon); | |
| 447 ~FreeIdSet(); | |
| 448 | |
| 449 static void set_safepoint(bool b); | |
| 450 | |
| 451 // Attempt to claim the given id permanently. Returns "true" iff | |
| 452 // successful. | |
| 453 bool claim_perm_id(int i); | |
| 454 | |
| 455 // Returns an unclaimed parallel id (waiting for one to be released if | |
| 456 // necessary). Returns "-1" if a GC wakes up a wait for an id. | |
| 457 int claim_par_id(); | |
| 458 | |
| 459 void release_par_id(int id); | |
| 460 }; |