Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.cpp @ 18041:52b4284cb496
Merge with jdk8u20-b26
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 16:02:50 +0200 |
| parents | 4ca6dc0799b6 78bbf4d43a14 |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2002, 2014, 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 #include "precompiled.hpp" |
| 26 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/gcTaskThread.hpp" | |
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28 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" |
| 1972 | 29 #include "memory/allocation.hpp" |
| 30 #include "memory/allocation.inline.hpp" | |
| 31 #include "runtime/mutex.hpp" | |
| 32 #include "runtime/mutexLocker.hpp" | |
| 0 | 33 |
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34 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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35 |
| 0 | 36 // |
| 37 // GCTask | |
| 38 // | |
| 39 | |
| 40 const char* GCTask::Kind::to_string(kind value) { | |
| 41 const char* result = "unknown GCTask kind"; | |
| 42 switch (value) { | |
| 43 default: | |
| 44 result = "unknown GCTask kind"; | |
| 45 break; | |
| 46 case unknown_task: | |
| 47 result = "unknown task"; | |
| 48 break; | |
| 49 case ordinary_task: | |
| 50 result = "ordinary task"; | |
| 51 break; | |
| 52 case barrier_task: | |
| 53 result = "barrier task"; | |
| 54 break; | |
| 55 case noop_task: | |
| 56 result = "noop task"; | |
| 57 break; | |
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58 case idle_task: |
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59 result = "idle task"; |
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60 break; |
| 0 | 61 } |
| 62 return result; | |
| 63 }; | |
| 64 | |
| 65 GCTask::GCTask() : | |
| 66 _kind(Kind::ordinary_task), | |
| 67 _affinity(GCTaskManager::sentinel_worker()){ | |
| 68 initialize(); | |
| 69 } | |
| 70 | |
| 71 GCTask::GCTask(Kind::kind kind) : | |
| 72 _kind(kind), | |
| 73 _affinity(GCTaskManager::sentinel_worker()) { | |
| 74 initialize(); | |
| 75 } | |
| 76 | |
| 77 GCTask::GCTask(uint affinity) : | |
| 78 _kind(Kind::ordinary_task), | |
| 79 _affinity(affinity) { | |
| 80 initialize(); | |
| 81 } | |
| 82 | |
| 83 GCTask::GCTask(Kind::kind kind, uint affinity) : | |
| 84 _kind(kind), | |
| 85 _affinity(affinity) { | |
| 86 initialize(); | |
| 87 } | |
| 88 | |
| 89 void GCTask::initialize() { | |
| 90 _older = NULL; | |
| 91 _newer = NULL; | |
| 92 } | |
| 93 | |
| 94 void GCTask::destruct() { | |
| 95 assert(older() == NULL, "shouldn't have an older task"); | |
| 96 assert(newer() == NULL, "shouldn't have a newer task"); | |
| 97 // Nothing to do. | |
| 98 } | |
| 99 | |
| 100 NOT_PRODUCT( | |
| 101 void GCTask::print(const char* message) const { | |
| 102 tty->print(INTPTR_FORMAT " <- " INTPTR_FORMAT "(%u) -> " INTPTR_FORMAT, | |
| 103 newer(), this, affinity(), older()); | |
| 104 } | |
| 105 ) | |
| 106 | |
| 107 // | |
| 108 // GCTaskQueue | |
| 109 // | |
| 110 | |
| 111 GCTaskQueue* GCTaskQueue::create() { | |
| 112 GCTaskQueue* result = new GCTaskQueue(false); | |
| 113 if (TraceGCTaskQueue) { | |
| 114 tty->print_cr("GCTaskQueue::create()" | |
| 115 " returns " INTPTR_FORMAT, result); | |
| 116 } | |
| 117 return result; | |
| 118 } | |
| 119 | |
| 120 GCTaskQueue* GCTaskQueue::create_on_c_heap() { | |
| 6197 | 121 GCTaskQueue* result = new(ResourceObj::C_HEAP, mtGC) GCTaskQueue(true); |
| 0 | 122 if (TraceGCTaskQueue) { |
| 123 tty->print_cr("GCTaskQueue::create_on_c_heap()" | |
| 124 " returns " INTPTR_FORMAT, | |
| 125 result); | |
| 126 } | |
| 127 return result; | |
| 128 } | |
| 129 | |
| 130 GCTaskQueue::GCTaskQueue(bool on_c_heap) : | |
| 131 _is_c_heap_obj(on_c_heap) { | |
| 132 initialize(); | |
| 133 if (TraceGCTaskQueue) { | |
| 134 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 135 " GCTaskQueue::GCTaskQueue() constructor", | |
| 136 this); | |
| 137 } | |
| 138 } | |
| 139 | |
| 140 void GCTaskQueue::destruct() { | |
| 141 // Nothing to do. | |
| 142 } | |
| 143 | |
| 144 void GCTaskQueue::destroy(GCTaskQueue* that) { | |
| 145 if (TraceGCTaskQueue) { | |
| 146 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 147 " GCTaskQueue::destroy()" | |
| 148 " is_c_heap_obj: %s", | |
| 149 that, | |
| 150 that->is_c_heap_obj() ? "true" : "false"); | |
| 151 } | |
| 152 // That instance may have been allocated as a CHeapObj, | |
| 153 // in which case we have to free it explicitly. | |
| 154 if (that != NULL) { | |
| 155 that->destruct(); | |
| 156 assert(that->is_empty(), "should be empty"); | |
| 157 if (that->is_c_heap_obj()) { | |
| 158 FreeHeap(that); | |
| 159 } | |
| 160 } | |
| 161 } | |
| 162 | |
| 163 void GCTaskQueue::initialize() { | |
| 164 set_insert_end(NULL); | |
| 165 set_remove_end(NULL); | |
| 166 set_length(0); | |
| 167 } | |
| 168 | |
| 169 // Enqueue one task. | |
| 170 void GCTaskQueue::enqueue(GCTask* task) { | |
| 171 if (TraceGCTaskQueue) { | |
| 172 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 173 " GCTaskQueue::enqueue(task: " | |
| 174 INTPTR_FORMAT ")", | |
| 175 this, task); | |
| 176 print("before:"); | |
| 177 } | |
| 178 assert(task != NULL, "shouldn't have null task"); | |
| 179 assert(task->older() == NULL, "shouldn't be on queue"); | |
| 180 assert(task->newer() == NULL, "shouldn't be on queue"); | |
| 181 task->set_newer(NULL); | |
| 182 task->set_older(insert_end()); | |
| 183 if (is_empty()) { | |
| 184 set_remove_end(task); | |
| 185 } else { | |
| 186 insert_end()->set_newer(task); | |
| 187 } | |
| 188 set_insert_end(task); | |
| 189 increment_length(); | |
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190 verify_length(); |
| 0 | 191 if (TraceGCTaskQueue) { |
| 192 print("after:"); | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 // Enqueue a whole list of tasks. Empties the argument list. | |
| 197 void GCTaskQueue::enqueue(GCTaskQueue* list) { | |
| 198 if (TraceGCTaskQueue) { | |
| 199 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 200 " GCTaskQueue::enqueue(list: " | |
| 201 INTPTR_FORMAT ")", | |
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202 this, list); |
| 0 | 203 print("before:"); |
| 204 list->print("list:"); | |
| 205 } | |
| 206 if (list->is_empty()) { | |
| 207 // Enqueuing the empty list: nothing to do. | |
| 208 return; | |
| 209 } | |
| 210 uint list_length = list->length(); | |
| 211 if (is_empty()) { | |
| 212 // Enqueuing to empty list: just acquire elements. | |
| 213 set_insert_end(list->insert_end()); | |
| 214 set_remove_end(list->remove_end()); | |
| 215 set_length(list_length); | |
| 216 } else { | |
| 217 // Prepend argument list to our queue. | |
| 218 list->remove_end()->set_older(insert_end()); | |
| 219 insert_end()->set_newer(list->remove_end()); | |
| 220 set_insert_end(list->insert_end()); | |
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221 set_length(length() + list_length); |
| 0 | 222 // empty the argument list. |
| 223 } | |
| 224 list->initialize(); | |
| 225 if (TraceGCTaskQueue) { | |
| 226 print("after:"); | |
| 227 list->print("list:"); | |
| 228 } | |
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229 verify_length(); |
| 0 | 230 } |
| 231 | |
| 232 // Dequeue one task. | |
| 233 GCTask* GCTaskQueue::dequeue() { | |
| 234 if (TraceGCTaskQueue) { | |
| 235 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 236 " GCTaskQueue::dequeue()", this); | |
| 237 print("before:"); | |
| 238 } | |
| 239 assert(!is_empty(), "shouldn't dequeue from empty list"); | |
| 240 GCTask* result = remove(); | |
| 241 assert(result != NULL, "shouldn't have NULL task"); | |
| 242 if (TraceGCTaskQueue) { | |
| 243 tty->print_cr(" return: " INTPTR_FORMAT, result); | |
| 244 print("after:"); | |
| 245 } | |
| 246 return result; | |
| 247 } | |
| 248 | |
| 249 // Dequeue one task, preferring one with affinity. | |
| 250 GCTask* GCTaskQueue::dequeue(uint affinity) { | |
| 251 if (TraceGCTaskQueue) { | |
| 252 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 253 " GCTaskQueue::dequeue(%u)", this, affinity); | |
| 254 print("before:"); | |
| 255 } | |
| 256 assert(!is_empty(), "shouldn't dequeue from empty list"); | |
| 257 // Look down to the next barrier for a task with this affinity. | |
| 258 GCTask* result = NULL; | |
| 259 for (GCTask* element = remove_end(); | |
| 260 element != NULL; | |
| 261 element = element->newer()) { | |
| 262 if (element->is_barrier_task()) { | |
| 263 // Don't consider barrier tasks, nor past them. | |
| 264 result = NULL; | |
| 265 break; | |
| 266 } | |
| 267 if (element->affinity() == affinity) { | |
| 268 result = remove(element); | |
| 269 break; | |
| 270 } | |
| 271 } | |
| 272 // If we didn't find anything with affinity, just take the next task. | |
| 273 if (result == NULL) { | |
| 274 result = remove(); | |
| 275 } | |
| 276 if (TraceGCTaskQueue) { | |
| 277 tty->print_cr(" return: " INTPTR_FORMAT, result); | |
| 278 print("after:"); | |
| 279 } | |
| 280 return result; | |
| 281 } | |
| 282 | |
| 283 GCTask* GCTaskQueue::remove() { | |
| 284 // Dequeue from remove end. | |
| 285 GCTask* result = remove_end(); | |
| 286 assert(result != NULL, "shouldn't have null task"); | |
| 287 assert(result->older() == NULL, "not the remove_end"); | |
| 288 set_remove_end(result->newer()); | |
| 289 if (remove_end() == NULL) { | |
| 290 assert(insert_end() == result, "not a singleton"); | |
| 291 set_insert_end(NULL); | |
| 292 } else { | |
| 293 remove_end()->set_older(NULL); | |
| 294 } | |
| 295 result->set_newer(NULL); | |
| 296 decrement_length(); | |
| 297 assert(result->newer() == NULL, "shouldn't be on queue"); | |
| 298 assert(result->older() == NULL, "shouldn't be on queue"); | |
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299 verify_length(); |
| 0 | 300 return result; |
| 301 } | |
| 302 | |
| 303 GCTask* GCTaskQueue::remove(GCTask* task) { | |
| 304 // This is slightly more work, and has slightly fewer asserts | |
| 305 // than removing from the remove end. | |
| 306 assert(task != NULL, "shouldn't have null task"); | |
| 307 GCTask* result = task; | |
| 308 if (result->newer() != NULL) { | |
| 309 result->newer()->set_older(result->older()); | |
| 310 } else { | |
| 311 assert(insert_end() == result, "not youngest"); | |
| 312 set_insert_end(result->older()); | |
| 313 } | |
| 314 if (result->older() != NULL) { | |
| 315 result->older()->set_newer(result->newer()); | |
| 316 } else { | |
| 317 assert(remove_end() == result, "not oldest"); | |
| 318 set_remove_end(result->newer()); | |
| 319 } | |
| 320 result->set_newer(NULL); | |
| 321 result->set_older(NULL); | |
| 322 decrement_length(); | |
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323 verify_length(); |
| 0 | 324 return result; |
| 325 } | |
| 326 | |
| 327 NOT_PRODUCT( | |
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328 // Count the elements in the queue and verify the length against |
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329 // that count. |
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330 void GCTaskQueue::verify_length() const { |
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331 uint count = 0; |
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332 for (GCTask* element = insert_end(); |
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333 element != NULL; |
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334 element = element->older()) { |
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335 |
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336 count++; |
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337 } |
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338 assert(count == length(), "Length does not match queue"); |
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339 } |
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340 |
| 0 | 341 void GCTaskQueue::print(const char* message) const { |
| 342 tty->print_cr("[" INTPTR_FORMAT "] GCTaskQueue:" | |
| 343 " insert_end: " INTPTR_FORMAT | |
| 344 " remove_end: " INTPTR_FORMAT | |
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345 " length: %d" |
| 0 | 346 " %s", |
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347 this, insert_end(), remove_end(), length(), message); |
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348 uint count = 0; |
| 0 | 349 for (GCTask* element = insert_end(); |
| 350 element != NULL; | |
| 351 element = element->older()) { | |
| 352 element->print(" "); | |
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353 count++; |
| 0 | 354 tty->cr(); |
| 355 } | |
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356 tty->print("Total tasks: %d", count); |
| 0 | 357 } |
| 358 ) | |
| 359 | |
| 360 // | |
| 361 // SynchronizedGCTaskQueue | |
| 362 // | |
| 363 | |
| 364 SynchronizedGCTaskQueue::SynchronizedGCTaskQueue(GCTaskQueue* queue_arg, | |
| 365 Monitor * lock_arg) : | |
| 366 _unsynchronized_queue(queue_arg), | |
| 367 _lock(lock_arg) { | |
| 368 assert(unsynchronized_queue() != NULL, "null queue"); | |
| 369 assert(lock() != NULL, "null lock"); | |
| 370 } | |
| 371 | |
| 372 SynchronizedGCTaskQueue::~SynchronizedGCTaskQueue() { | |
| 373 // Nothing to do. | |
| 374 } | |
| 375 | |
| 376 // | |
| 377 // GCTaskManager | |
| 378 // | |
| 379 GCTaskManager::GCTaskManager(uint workers) : | |
| 380 _workers(workers), | |
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381 _active_workers(0), |
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382 _idle_workers(0), |
| 0 | 383 _ndc(NULL) { |
| 384 initialize(); | |
| 385 } | |
| 386 | |
| 387 GCTaskManager::GCTaskManager(uint workers, NotifyDoneClosure* ndc) : | |
| 388 _workers(workers), | |
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389 _active_workers(0), |
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390 _idle_workers(0), |
| 0 | 391 _ndc(ndc) { |
| 392 initialize(); | |
| 393 } | |
| 394 | |
| 395 void GCTaskManager::initialize() { | |
| 396 if (TraceGCTaskManager) { | |
| 397 tty->print_cr("GCTaskManager::initialize: workers: %u", workers()); | |
| 398 } | |
| 399 assert(workers() != 0, "no workers"); | |
| 400 _monitor = new Monitor(Mutex::barrier, // rank | |
| 401 "GCTaskManager monitor", // name | |
| 402 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 403 // The queue for the GCTaskManager must be a CHeapObj. | |
| 404 GCTaskQueue* unsynchronized_queue = GCTaskQueue::create_on_c_heap(); | |
| 405 _queue = SynchronizedGCTaskQueue::create(unsynchronized_queue, lock()); | |
| 406 _noop_task = NoopGCTask::create_on_c_heap(); | |
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407 _idle_inactive_task = WaitForBarrierGCTask::create_on_c_heap(); |
| 6197 | 408 _resource_flag = NEW_C_HEAP_ARRAY(bool, workers(), mtGC); |
| 0 | 409 { |
| 410 // Set up worker threads. | |
| 411 // Distribute the workers among the available processors, | |
| 412 // unless we were told not to, or if the os doesn't want to. | |
| 6197 | 413 uint* processor_assignment = NEW_C_HEAP_ARRAY(uint, workers(), mtGC); |
| 0 | 414 if (!BindGCTaskThreadsToCPUs || |
| 415 !os::distribute_processes(workers(), processor_assignment)) { | |
| 416 for (uint a = 0; a < workers(); a += 1) { | |
| 417 processor_assignment[a] = sentinel_worker(); | |
| 418 } | |
| 419 } | |
| 6197 | 420 _thread = NEW_C_HEAP_ARRAY(GCTaskThread*, workers(), mtGC); |
| 0 | 421 for (uint t = 0; t < workers(); t += 1) { |
| 422 set_thread(t, GCTaskThread::create(this, t, processor_assignment[t])); | |
| 423 } | |
| 424 if (TraceGCTaskThread) { | |
| 425 tty->print("GCTaskManager::initialize: distribution:"); | |
| 426 for (uint t = 0; t < workers(); t += 1) { | |
| 427 tty->print(" %u", processor_assignment[t]); | |
| 428 } | |
| 429 tty->cr(); | |
| 430 } | |
| 6197 | 431 FREE_C_HEAP_ARRAY(uint, processor_assignment, mtGC); |
| 0 | 432 } |
| 433 reset_busy_workers(); | |
| 434 set_unblocked(); | |
| 435 for (uint w = 0; w < workers(); w += 1) { | |
| 436 set_resource_flag(w, false); | |
| 437 } | |
| 438 reset_delivered_tasks(); | |
| 439 reset_completed_tasks(); | |
| 440 reset_noop_tasks(); | |
| 441 reset_barriers(); | |
| 442 reset_emptied_queue(); | |
| 443 for (uint s = 0; s < workers(); s += 1) { | |
| 444 thread(s)->start(); | |
| 445 } | |
| 446 } | |
| 447 | |
| 448 GCTaskManager::~GCTaskManager() { | |
| 449 assert(busy_workers() == 0, "still have busy workers"); | |
| 450 assert(queue()->is_empty(), "still have queued work"); | |
| 451 NoopGCTask::destroy(_noop_task); | |
| 452 _noop_task = NULL; | |
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453 WaitForBarrierGCTask::destroy(_idle_inactive_task); |
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454 _idle_inactive_task = NULL; |
| 0 | 455 if (_thread != NULL) { |
| 456 for (uint i = 0; i < workers(); i += 1) { | |
| 457 GCTaskThread::destroy(thread(i)); | |
| 458 set_thread(i, NULL); | |
| 459 } | |
| 6197 | 460 FREE_C_HEAP_ARRAY(GCTaskThread*, _thread, mtGC); |
| 0 | 461 _thread = NULL; |
| 462 } | |
| 463 if (_resource_flag != NULL) { | |
| 6197 | 464 FREE_C_HEAP_ARRAY(bool, _resource_flag, mtGC); |
| 0 | 465 _resource_flag = NULL; |
| 466 } | |
| 467 if (queue() != NULL) { | |
| 468 GCTaskQueue* unsynchronized_queue = queue()->unsynchronized_queue(); | |
| 469 GCTaskQueue::destroy(unsynchronized_queue); | |
| 470 SynchronizedGCTaskQueue::destroy(queue()); | |
| 471 _queue = NULL; | |
| 472 } | |
| 473 if (monitor() != NULL) { | |
| 474 delete monitor(); | |
| 475 _monitor = NULL; | |
| 476 } | |
| 477 } | |
| 478 | |
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479 void GCTaskManager::set_active_gang() { |
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480 _active_workers = |
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481 AdaptiveSizePolicy::calc_active_workers(workers(), |
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482 active_workers(), |
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483 Threads::number_of_non_daemon_threads()); |
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484 |
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485 assert(!all_workers_active() || active_workers() == ParallelGCThreads, |
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486 err_msg("all_workers_active() is incorrect: " |
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487 "active %d ParallelGCThreads %d", active_workers(), |
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488 ParallelGCThreads)); |
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489 if (TraceDynamicGCThreads) { |
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490 gclog_or_tty->print_cr("GCTaskManager::set_active_gang(): " |
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491 "all_workers_active() %d workers %d " |
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492 "active %d ParallelGCThreads %d ", |
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493 all_workers_active(), workers(), active_workers(), |
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494 ParallelGCThreads); |
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495 } |
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496 } |
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497 |
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498 // Create IdleGCTasks for inactive workers. |
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499 // Creates tasks in a ResourceArea and assumes |
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500 // an appropriate ResourceMark. |
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501 void GCTaskManager::task_idle_workers() { |
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502 { |
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503 int more_inactive_workers = 0; |
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504 { |
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505 // Stop any idle tasks from exiting their IdleGCTask's |
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506 // and get the count for additional IdleGCTask's under |
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507 // the GCTaskManager's monitor so that the "more_inactive_workers" |
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508 // count is correct. |
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509 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
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510 _idle_inactive_task->set_should_wait(true); |
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511 // active_workers are a number being requested. idle_workers |
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512 // are the number currently idle. If all the workers are being |
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513 // requested to be active but some are already idle, reduce |
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514 // the number of active_workers to be consistent with the |
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515 // number of idle_workers. The idle_workers are stuck in |
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516 // idle tasks and will no longer be release (since a new GC |
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517 // is starting). Try later to release enough idle_workers |
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518 // to allow the desired number of active_workers. |
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519 more_inactive_workers = |
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520 workers() - active_workers() - idle_workers(); |
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521 if (more_inactive_workers < 0) { |
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522 int reduced_active_workers = active_workers() + more_inactive_workers; |
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523 set_active_workers(reduced_active_workers); |
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524 more_inactive_workers = 0; |
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525 } |
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526 if (TraceDynamicGCThreads) { |
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527 gclog_or_tty->print_cr("JT: %d workers %d active %d " |
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528 "idle %d more %d", |
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529 Threads::number_of_non_daemon_threads(), |
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530 workers(), |
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531 active_workers(), |
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532 idle_workers(), |
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533 more_inactive_workers); |
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534 } |
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535 } |
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536 GCTaskQueue* q = GCTaskQueue::create(); |
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537 for(uint i = 0; i < (uint) more_inactive_workers; i++) { |
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538 q->enqueue(IdleGCTask::create_on_c_heap()); |
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539 increment_idle_workers(); |
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540 } |
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541 assert(workers() == active_workers() + idle_workers(), |
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542 "total workers should equal active + inactive"); |
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543 add_list(q); |
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544 // GCTaskQueue* q was created in a ResourceArea so a |
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545 // destroy() call is not needed. |
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546 } |
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547 } |
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548 |
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549 void GCTaskManager::release_idle_workers() { |
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550 { |
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551 MutexLockerEx ml(monitor(), |
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552 Mutex::_no_safepoint_check_flag); |
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553 _idle_inactive_task->set_should_wait(false); |
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554 monitor()->notify_all(); |
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555 // Release monitor |
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556 } |
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557 } |
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558 |
| 0 | 559 void GCTaskManager::print_task_time_stamps() { |
| 560 for(uint i=0; i<ParallelGCThreads; i++) { | |
| 561 GCTaskThread* t = thread(i); | |
| 562 t->print_task_time_stamps(); | |
| 563 } | |
| 564 } | |
| 565 | |
| 566 void GCTaskManager::print_threads_on(outputStream* st) { | |
| 567 uint num_thr = workers(); | |
| 568 for (uint i = 0; i < num_thr; i++) { | |
| 569 thread(i)->print_on(st); | |
| 570 st->cr(); | |
| 571 } | |
| 572 } | |
| 573 | |
| 574 void GCTaskManager::threads_do(ThreadClosure* tc) { | |
| 575 assert(tc != NULL, "Null ThreadClosure"); | |
| 576 uint num_thr = workers(); | |
| 577 for (uint i = 0; i < num_thr; i++) { | |
| 578 tc->do_thread(thread(i)); | |
| 579 } | |
| 580 } | |
| 581 | |
| 582 GCTaskThread* GCTaskManager::thread(uint which) { | |
| 583 assert(which < workers(), "index out of bounds"); | |
| 584 assert(_thread[which] != NULL, "shouldn't have null thread"); | |
| 585 return _thread[which]; | |
| 586 } | |
| 587 | |
| 588 void GCTaskManager::set_thread(uint which, GCTaskThread* value) { | |
| 589 assert(which < workers(), "index out of bounds"); | |
| 590 assert(value != NULL, "shouldn't have null thread"); | |
| 591 _thread[which] = value; | |
| 592 } | |
| 593 | |
| 594 void GCTaskManager::add_task(GCTask* task) { | |
| 595 assert(task != NULL, "shouldn't have null task"); | |
| 596 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 597 if (TraceGCTaskManager) { | |
| 598 tty->print_cr("GCTaskManager::add_task(" INTPTR_FORMAT " [%s])", | |
| 599 task, GCTask::Kind::to_string(task->kind())); | |
| 600 } | |
| 601 queue()->enqueue(task); | |
| 602 // Notify with the lock held to avoid missed notifies. | |
| 603 if (TraceGCTaskManager) { | |
| 604 tty->print_cr(" GCTaskManager::add_task (%s)->notify_all", | |
| 605 monitor()->name()); | |
| 606 } | |
| 607 (void) monitor()->notify_all(); | |
| 608 // Release monitor(). | |
| 609 } | |
| 610 | |
| 611 void GCTaskManager::add_list(GCTaskQueue* list) { | |
| 612 assert(list != NULL, "shouldn't have null task"); | |
| 613 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 614 if (TraceGCTaskManager) { | |
| 615 tty->print_cr("GCTaskManager::add_list(%u)", list->length()); | |
| 616 } | |
| 617 queue()->enqueue(list); | |
| 618 // Notify with the lock held to avoid missed notifies. | |
| 619 if (TraceGCTaskManager) { | |
| 620 tty->print_cr(" GCTaskManager::add_list (%s)->notify_all", | |
| 621 monitor()->name()); | |
| 622 } | |
| 623 (void) monitor()->notify_all(); | |
| 624 // Release monitor(). | |
| 625 } | |
| 626 | |
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627 // GC workers wait in get_task() for new work to be added |
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628 // to the GCTaskManager's queue. When new work is added, |
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629 // a notify is sent to the waiting GC workers which then |
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630 // compete to get tasks. If a GC worker wakes up and there |
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631 // is no work on the queue, it is given a noop_task to execute |
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632 // and then loops to find more work. |
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633 |
| 0 | 634 GCTask* GCTaskManager::get_task(uint which) { |
| 635 GCTask* result = NULL; | |
| 636 // Grab the queue lock. | |
| 637 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 638 // Wait while the queue is block or | |
| 639 // there is nothing to do, except maybe release resources. | |
| 640 while (is_blocked() || | |
| 641 (queue()->is_empty() && !should_release_resources(which))) { | |
| 642 if (TraceGCTaskManager) { | |
| 643 tty->print_cr("GCTaskManager::get_task(%u)" | |
| 644 " blocked: %s" | |
| 645 " empty: %s" | |
| 646 " release: %s", | |
| 647 which, | |
| 648 is_blocked() ? "true" : "false", | |
| 649 queue()->is_empty() ? "true" : "false", | |
| 650 should_release_resources(which) ? "true" : "false"); | |
| 651 tty->print_cr(" => (%s)->wait()", | |
| 652 monitor()->name()); | |
| 653 } | |
| 654 monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 655 } | |
| 656 // We've reacquired the queue lock here. | |
| 657 // Figure out which condition caused us to exit the loop above. | |
| 658 if (!queue()->is_empty()) { | |
| 659 if (UseGCTaskAffinity) { | |
| 660 result = queue()->dequeue(which); | |
| 661 } else { | |
| 662 result = queue()->dequeue(); | |
| 663 } | |
| 664 if (result->is_barrier_task()) { | |
| 665 assert(which != sentinel_worker(), | |
| 666 "blocker shouldn't be bogus"); | |
| 667 set_blocking_worker(which); | |
| 668 } | |
| 669 } else { | |
| 670 // The queue is empty, but we were woken up. | |
| 671 // Just hand back a Noop task, | |
| 672 // in case someone wanted us to release resources, or whatever. | |
| 673 result = noop_task(); | |
| 674 increment_noop_tasks(); | |
| 675 } | |
| 676 assert(result != NULL, "shouldn't have null task"); | |
| 677 if (TraceGCTaskManager) { | |
| 678 tty->print_cr("GCTaskManager::get_task(%u) => " INTPTR_FORMAT " [%s]", | |
| 679 which, result, GCTask::Kind::to_string(result->kind())); | |
| 680 tty->print_cr(" %s", result->name()); | |
| 681 } | |
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682 if (!result->is_idle_task()) { |
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683 increment_busy_workers(); |
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684 increment_delivered_tasks(); |
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685 } |
| 0 | 686 return result; |
| 687 // Release monitor(). | |
| 688 } | |
| 689 | |
| 690 void GCTaskManager::note_completion(uint which) { | |
| 691 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 692 if (TraceGCTaskManager) { | |
| 693 tty->print_cr("GCTaskManager::note_completion(%u)", which); | |
| 694 } | |
| 695 // If we are blocked, check if the completing thread is the blocker. | |
| 696 if (blocking_worker() == which) { | |
| 697 assert(blocking_worker() != sentinel_worker(), | |
| 698 "blocker shouldn't be bogus"); | |
| 699 increment_barriers(); | |
| 700 set_unblocked(); | |
| 701 } | |
| 702 increment_completed_tasks(); | |
| 703 uint active = decrement_busy_workers(); | |
| 704 if ((active == 0) && (queue()->is_empty())) { | |
| 705 increment_emptied_queue(); | |
| 706 if (TraceGCTaskManager) { | |
| 707 tty->print_cr(" GCTaskManager::note_completion(%u) done", which); | |
| 708 } | |
| 709 // Notify client that we are done. | |
| 710 NotifyDoneClosure* ndc = notify_done_closure(); | |
| 711 if (ndc != NULL) { | |
| 712 ndc->notify(this); | |
| 713 } | |
| 714 } | |
| 715 if (TraceGCTaskManager) { | |
| 716 tty->print_cr(" GCTaskManager::note_completion(%u) (%s)->notify_all", | |
| 717 which, monitor()->name()); | |
| 718 tty->print_cr(" " | |
| 719 " blocked: %s" | |
| 720 " empty: %s" | |
| 721 " release: %s", | |
| 722 is_blocked() ? "true" : "false", | |
| 723 queue()->is_empty() ? "true" : "false", | |
| 724 should_release_resources(which) ? "true" : "false"); | |
| 725 tty->print_cr(" " | |
| 726 " delivered: %u" | |
| 727 " completed: %u" | |
| 728 " barriers: %u" | |
| 729 " emptied: %u", | |
| 730 delivered_tasks(), | |
| 731 completed_tasks(), | |
| 732 barriers(), | |
| 733 emptied_queue()); | |
| 734 } | |
| 735 // Tell everyone that a task has completed. | |
| 736 (void) monitor()->notify_all(); | |
| 737 // Release monitor(). | |
| 738 } | |
| 739 | |
| 740 uint GCTaskManager::increment_busy_workers() { | |
| 741 assert(queue()->own_lock(), "don't own the lock"); | |
| 742 _busy_workers += 1; | |
| 743 return _busy_workers; | |
| 744 } | |
| 745 | |
| 746 uint GCTaskManager::decrement_busy_workers() { | |
| 747 assert(queue()->own_lock(), "don't own the lock"); | |
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748 assert(_busy_workers > 0, "About to make a mistake"); |
| 0 | 749 _busy_workers -= 1; |
| 750 return _busy_workers; | |
| 751 } | |
| 752 | |
| 753 void GCTaskManager::release_all_resources() { | |
| 754 // If you want this to be done atomically, do it in a BarrierGCTask. | |
| 755 for (uint i = 0; i < workers(); i += 1) { | |
| 756 set_resource_flag(i, true); | |
| 757 } | |
| 758 } | |
| 759 | |
| 760 bool GCTaskManager::should_release_resources(uint which) { | |
| 761 // This can be done without a lock because each thread reads one element. | |
| 762 return resource_flag(which); | |
| 763 } | |
| 764 | |
| 765 void GCTaskManager::note_release(uint which) { | |
| 766 // This can be done without a lock because each thread writes one element. | |
| 767 set_resource_flag(which, false); | |
| 768 } | |
| 769 | |
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770 // "list" contains tasks that are ready to execute. Those |
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771 // tasks are added to the GCTaskManager's queue of tasks and |
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772 // then the GC workers are notified that there is new work to |
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773 // do. |
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774 // |
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775 // Typically different types of tasks can be added to the "list". |
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776 // For example in PSScavenge OldToYoungRootsTask, SerialOldToYoungRootsTask, |
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777 // ScavengeRootsTask, and StealTask tasks are all added to the list |
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778 // and then the GC workers are notified of new work. The tasks are |
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779 // handed out in the order in which they are added to the list |
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780 // (although execution is not necessarily in that order). As long |
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781 // as any tasks are running the GCTaskManager will wait for execution |
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782 // to complete. GC workers that execute a stealing task remain in |
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783 // the stealing task until all stealing tasks have completed. The load |
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784 // balancing afforded by the stealing tasks work best if the stealing |
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785 // tasks are added last to the list. |
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786 |
| 0 | 787 void GCTaskManager::execute_and_wait(GCTaskQueue* list) { |
| 788 WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); | |
| 789 list->enqueue(fin); | |
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790 // The barrier task will be read by one of the GC |
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791 // workers once it is added to the list of tasks. |
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792 // Be sure that is globally visible before the |
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793 // GC worker reads it (which is after the task is added |
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794 // to the list of tasks below). |
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795 OrderAccess::storestore(); |
| 0 | 796 add_list(list); |
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797 fin->wait_for(true /* reset */); |
| 0 | 798 // We have to release the barrier tasks! |
| 799 WaitForBarrierGCTask::destroy(fin); | |
| 800 } | |
| 801 | |
| 802 bool GCTaskManager::resource_flag(uint which) { | |
| 803 assert(which < workers(), "index out of bounds"); | |
| 804 return _resource_flag[which]; | |
| 805 } | |
| 806 | |
| 807 void GCTaskManager::set_resource_flag(uint which, bool value) { | |
| 808 assert(which < workers(), "index out of bounds"); | |
| 809 _resource_flag[which] = value; | |
| 810 } | |
| 811 | |
| 812 // | |
| 813 // NoopGCTask | |
| 814 // | |
| 815 | |
| 816 NoopGCTask* NoopGCTask::create() { | |
| 817 NoopGCTask* result = new NoopGCTask(false); | |
| 818 return result; | |
| 819 } | |
| 820 | |
| 821 NoopGCTask* NoopGCTask::create_on_c_heap() { | |
| 6197 | 822 NoopGCTask* result = new(ResourceObj::C_HEAP, mtGC) NoopGCTask(true); |
| 0 | 823 return result; |
| 824 } | |
| 825 | |
| 826 void NoopGCTask::destroy(NoopGCTask* that) { | |
| 827 if (that != NULL) { | |
| 828 that->destruct(); | |
| 829 if (that->is_c_heap_obj()) { | |
| 830 FreeHeap(that); | |
| 831 } | |
| 832 } | |
| 833 } | |
| 834 | |
| 835 void NoopGCTask::destruct() { | |
| 836 // This has to know it's superclass structure, just like the constructor. | |
| 837 this->GCTask::destruct(); | |
| 838 // Nothing else to do. | |
| 839 } | |
| 840 | |
| 841 // | |
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842 // IdleGCTask |
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843 // |
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844 |
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845 IdleGCTask* IdleGCTask::create() { |
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846 IdleGCTask* result = new IdleGCTask(false); |
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847 assert(UseDynamicNumberOfGCThreads, |
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848 "Should only be used with dynamic GC thread"); |
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849 return result; |
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850 } |
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851 |
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852 IdleGCTask* IdleGCTask::create_on_c_heap() { |
| 6197 | 853 IdleGCTask* result = new(ResourceObj::C_HEAP, mtGC) IdleGCTask(true); |
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854 assert(UseDynamicNumberOfGCThreads, |
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855 "Should only be used with dynamic GC thread"); |
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856 return result; |
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857 } |
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858 |
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859 void IdleGCTask::do_it(GCTaskManager* manager, uint which) { |
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860 WaitForBarrierGCTask* wait_for_task = manager->idle_inactive_task(); |
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861 if (TraceGCTaskManager) { |
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862 tty->print_cr("[" INTPTR_FORMAT "]" |
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863 " IdleGCTask:::do_it()" |
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864 " should_wait: %s", |
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865 this, wait_for_task->should_wait() ? "true" : "false"); |
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866 } |
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867 MutexLockerEx ml(manager->monitor(), Mutex::_no_safepoint_check_flag); |
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868 if (TraceDynamicGCThreads) { |
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869 gclog_or_tty->print_cr("--- idle %d", which); |
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870 } |
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871 // Increment has to be done when the idle tasks are created. |
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872 // manager->increment_idle_workers(); |
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873 manager->monitor()->notify_all(); |
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874 while (wait_for_task->should_wait()) { |
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875 if (TraceGCTaskManager) { |
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876 tty->print_cr("[" INTPTR_FORMAT "]" |
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877 " IdleGCTask::do_it()" |
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878 " [" INTPTR_FORMAT "] (%s)->wait()", |
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879 this, manager->monitor(), manager->monitor()->name()); |
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880 } |
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881 manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
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882 } |
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883 manager->decrement_idle_workers(); |
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884 if (TraceDynamicGCThreads) { |
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885 gclog_or_tty->print_cr("--- release %d", which); |
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886 } |
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887 if (TraceGCTaskManager) { |
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888 tty->print_cr("[" INTPTR_FORMAT "]" |
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889 " IdleGCTask::do_it() returns" |
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890 " should_wait: %s", |
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891 this, wait_for_task->should_wait() ? "true" : "false"); |
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892 } |
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893 // Release monitor(). |
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894 } |
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895 |
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896 void IdleGCTask::destroy(IdleGCTask* that) { |
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897 if (that != NULL) { |
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898 that->destruct(); |
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899 if (that->is_c_heap_obj()) { |
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900 FreeHeap(that); |
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901 } |
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902 } |
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903 } |
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904 |
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905 void IdleGCTask::destruct() { |
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906 // This has to know it's superclass structure, just like the constructor. |
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907 this->GCTask::destruct(); |
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908 // Nothing else to do. |
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909 } |
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910 |
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911 // |
| 0 | 912 // BarrierGCTask |
| 913 // | |
| 914 | |
| 915 void BarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 916 // Wait for this to be the only busy worker. | |
| 917 // ??? I thought of having a StackObj class | |
| 918 // whose constructor would grab the lock and come to the barrier, | |
| 919 // and whose destructor would release the lock, | |
| 920 // but that seems like too much mechanism for two lines of code. | |
| 921 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 922 do_it_internal(manager, which); | |
| 923 // Release manager->lock(). | |
| 924 } | |
| 925 | |
| 926 void BarrierGCTask::do_it_internal(GCTaskManager* manager, uint which) { | |
| 927 // Wait for this to be the only busy worker. | |
| 928 assert(manager->monitor()->owned_by_self(), "don't own the lock"); | |
| 929 assert(manager->is_blocked(), "manager isn't blocked"); | |
| 930 while (manager->busy_workers() > 1) { | |
| 931 if (TraceGCTaskManager) { | |
| 932 tty->print_cr("BarrierGCTask::do_it(%u) waiting on %u workers", | |
| 933 which, manager->busy_workers()); | |
| 934 } | |
| 935 manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 936 } | |
| 937 } | |
| 938 | |
| 939 void BarrierGCTask::destruct() { | |
| 940 this->GCTask::destruct(); | |
| 941 // Nothing else to do. | |
| 942 } | |
| 943 | |
| 944 // | |
| 945 // ReleasingBarrierGCTask | |
| 946 // | |
| 947 | |
| 948 void ReleasingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 949 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 950 do_it_internal(manager, which); | |
| 951 manager->release_all_resources(); | |
| 952 // Release manager->lock(). | |
| 953 } | |
| 954 | |
| 955 void ReleasingBarrierGCTask::destruct() { | |
| 956 this->BarrierGCTask::destruct(); | |
| 957 // Nothing else to do. | |
| 958 } | |
| 959 | |
| 960 // | |
| 961 // NotifyingBarrierGCTask | |
| 962 // | |
| 963 | |
| 964 void NotifyingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 965 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 966 do_it_internal(manager, which); | |
| 967 NotifyDoneClosure* ndc = notify_done_closure(); | |
| 968 if (ndc != NULL) { | |
| 969 ndc->notify(manager); | |
| 970 } | |
| 971 // Release manager->lock(). | |
| 972 } | |
| 973 | |
| 974 void NotifyingBarrierGCTask::destruct() { | |
| 975 this->BarrierGCTask::destruct(); | |
| 976 // Nothing else to do. | |
| 977 } | |
| 978 | |
| 979 // | |
| 980 // WaitForBarrierGCTask | |
| 981 // | |
| 982 WaitForBarrierGCTask* WaitForBarrierGCTask::create() { | |
| 983 WaitForBarrierGCTask* result = new WaitForBarrierGCTask(false); | |
| 984 return result; | |
| 985 } | |
| 986 | |
| 987 WaitForBarrierGCTask* WaitForBarrierGCTask::create_on_c_heap() { | |
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988 WaitForBarrierGCTask* result = |
| 6197 | 989 new (ResourceObj::C_HEAP, mtGC) WaitForBarrierGCTask(true); |
| 0 | 990 return result; |
| 991 } | |
| 992 | |
| 993 WaitForBarrierGCTask::WaitForBarrierGCTask(bool on_c_heap) : | |
| 994 _is_c_heap_obj(on_c_heap) { | |
| 995 _monitor = MonitorSupply::reserve(); | |
| 996 set_should_wait(true); | |
| 997 if (TraceGCTaskManager) { | |
| 998 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 999 " WaitForBarrierGCTask::WaitForBarrierGCTask()" | |
| 1000 " monitor: " INTPTR_FORMAT, | |
| 1001 this, monitor()); | |
| 1002 } | |
| 1003 } | |
| 1004 | |
| 1005 void WaitForBarrierGCTask::destroy(WaitForBarrierGCTask* that) { | |
| 1006 if (that != NULL) { | |
| 1007 if (TraceGCTaskManager) { | |
| 1008 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1009 " WaitForBarrierGCTask::destroy()" | |
| 1010 " is_c_heap_obj: %s" | |
| 1011 " monitor: " INTPTR_FORMAT, | |
| 1012 that, | |
| 1013 that->is_c_heap_obj() ? "true" : "false", | |
| 1014 that->monitor()); | |
| 1015 } | |
| 1016 that->destruct(); | |
| 1017 if (that->is_c_heap_obj()) { | |
| 1018 FreeHeap(that); | |
| 1019 } | |
| 1020 } | |
| 1021 } | |
| 1022 | |
| 1023 void WaitForBarrierGCTask::destruct() { | |
| 1024 assert(monitor() != NULL, "monitor should not be NULL"); | |
| 1025 if (TraceGCTaskManager) { | |
| 1026 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1027 " WaitForBarrierGCTask::destruct()" | |
| 1028 " monitor: " INTPTR_FORMAT, | |
| 1029 this, monitor()); | |
| 1030 } | |
| 1031 this->BarrierGCTask::destruct(); | |
| 1032 // Clean up that should be in the destructor, | |
| 1033 // except that ResourceMarks don't call destructors. | |
| 1034 if (monitor() != NULL) { | |
| 1035 MonitorSupply::release(monitor()); | |
| 1036 } | |
| 1037 _monitor = (Monitor*) 0xDEAD000F; | |
| 1038 } | |
| 1039 | |
| 1040 void WaitForBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 1041 if (TraceGCTaskManager) { | |
| 1042 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1043 " WaitForBarrierGCTask::do_it() waiting for idle" | |
| 1044 " monitor: " INTPTR_FORMAT, | |
| 1045 this, monitor()); | |
| 1046 } | |
| 1047 { | |
| 1048 // First, wait for the barrier to arrive. | |
| 1049 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 1050 do_it_internal(manager, which); | |
| 1051 // Release manager->lock(). | |
| 1052 } | |
| 1053 { | |
| 1054 // Then notify the waiter. | |
| 1055 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 1056 set_should_wait(false); | |
| 1057 // Waiter doesn't miss the notify in the wait_for method | |
| 1058 // since it checks the flag after grabbing the monitor. | |
| 1059 if (TraceGCTaskManager) { | |
| 1060 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1061 " WaitForBarrierGCTask::do_it()" | |
| 1062 " [" INTPTR_FORMAT "] (%s)->notify_all()", | |
| 1063 this, monitor(), monitor()->name()); | |
| 1064 } | |
| 1065 monitor()->notify_all(); | |
| 1066 // Release monitor(). | |
| 1067 } | |
| 1068 } | |
| 1069 | |
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1070 void WaitForBarrierGCTask::wait_for(bool reset) { |
| 0 | 1071 if (TraceGCTaskManager) { |
| 1072 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1073 " WaitForBarrierGCTask::wait_for()" | |
| 1074 " should_wait: %s", | |
| 1075 this, should_wait() ? "true" : "false"); | |
| 1076 } | |
| 1077 { | |
| 1078 // Grab the lock and check again. | |
| 1079 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 1080 while (should_wait()) { | |
| 1081 if (TraceGCTaskManager) { | |
| 1082 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1083 " WaitForBarrierGCTask::wait_for()" | |
| 1084 " [" INTPTR_FORMAT "] (%s)->wait()", | |
| 1085 this, monitor(), monitor()->name()); | |
| 1086 } | |
| 1087 monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 1088 } | |
| 1089 // Reset the flag in case someone reuses this task. | |
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1090 if (reset) { |
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1091 set_should_wait(true); |
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1092 } |
| 0 | 1093 if (TraceGCTaskManager) { |
| 1094 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1095 " WaitForBarrierGCTask::wait_for() returns" | |
| 1096 " should_wait: %s", | |
| 1097 this, should_wait() ? "true" : "false"); | |
| 1098 } | |
| 1099 // Release monitor(). | |
| 1100 } | |
| 1101 } | |
| 1102 | |
| 1103 Mutex* MonitorSupply::_lock = NULL; | |
| 1104 GrowableArray<Monitor*>* MonitorSupply::_freelist = NULL; | |
| 1105 | |
| 1106 Monitor* MonitorSupply::reserve() { | |
| 1107 Monitor* result = NULL; | |
| 1108 // Lazy initialization: possible race. | |
| 1109 if (lock() == NULL) { | |
| 1110 _lock = new Mutex(Mutex::barrier, // rank | |
| 1111 "MonitorSupply mutex", // name | |
| 1112 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 1113 } | |
| 1114 { | |
| 1115 MutexLockerEx ml(lock()); | |
| 1116 // Lazy initialization. | |
| 1117 if (freelist() == NULL) { | |
| 1118 _freelist = | |
| 6197 | 1119 new(ResourceObj::C_HEAP, mtGC) GrowableArray<Monitor*>(ParallelGCThreads, |
| 0 | 1120 true); |
| 1121 } | |
| 1122 if (! freelist()->is_empty()) { | |
| 1123 result = freelist()->pop(); | |
| 1124 } else { | |
| 1125 result = new Monitor(Mutex::barrier, // rank | |
| 1126 "MonitorSupply monitor", // name | |
| 1127 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 1128 } | |
| 1129 guarantee(result != NULL, "shouldn't return NULL"); | |
| 1130 assert(!result->is_locked(), "shouldn't be locked"); | |
| 1131 // release lock(). | |
| 1132 } | |
| 1133 return result; | |
| 1134 } | |
| 1135 | |
| 1136 void MonitorSupply::release(Monitor* instance) { | |
| 1137 assert(instance != NULL, "shouldn't release NULL"); | |
| 1138 assert(!instance->is_locked(), "shouldn't be locked"); | |
| 1139 { | |
| 1140 MutexLockerEx ml(lock()); | |
| 1141 freelist()->push(instance); | |
| 1142 // release lock(). | |
| 1143 } | |
| 1144 } |