Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.cpp @ 20197:ce8f6bb717c9
8042195: Introduce umbrella header orderAccess.inline.hpp.
Reviewed-by: dholmes, kvn, stefank, twisti
| author | goetz |
|---|---|
| date | Tue, 29 Apr 2014 15:17:27 +0200 |
| parents | 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" | |
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33 #include "runtime/orderAccess.inline.hpp" |
| 0 | 34 |
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35 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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36 |
| 0 | 37 // |
| 38 // GCTask | |
| 39 // | |
| 40 | |
| 41 const char* GCTask::Kind::to_string(kind value) { | |
| 42 const char* result = "unknown GCTask kind"; | |
| 43 switch (value) { | |
| 44 default: | |
| 45 result = "unknown GCTask kind"; | |
| 46 break; | |
| 47 case unknown_task: | |
| 48 result = "unknown task"; | |
| 49 break; | |
| 50 case ordinary_task: | |
| 51 result = "ordinary task"; | |
| 52 break; | |
| 53 case barrier_task: | |
| 54 result = "barrier task"; | |
| 55 break; | |
| 56 case noop_task: | |
| 57 result = "noop task"; | |
| 58 break; | |
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59 case idle_task: |
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60 result = "idle task"; |
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61 break; |
| 0 | 62 } |
| 63 return result; | |
| 64 }; | |
| 65 | |
| 66 GCTask::GCTask() : | |
| 67 _kind(Kind::ordinary_task), | |
| 68 _affinity(GCTaskManager::sentinel_worker()){ | |
| 69 initialize(); | |
| 70 } | |
| 71 | |
| 72 GCTask::GCTask(Kind::kind kind) : | |
| 73 _kind(kind), | |
| 74 _affinity(GCTaskManager::sentinel_worker()) { | |
| 75 initialize(); | |
| 76 } | |
| 77 | |
| 78 GCTask::GCTask(uint affinity) : | |
| 79 _kind(Kind::ordinary_task), | |
| 80 _affinity(affinity) { | |
| 81 initialize(); | |
| 82 } | |
| 83 | |
| 84 GCTask::GCTask(Kind::kind kind, uint affinity) : | |
| 85 _kind(kind), | |
| 86 _affinity(affinity) { | |
| 87 initialize(); | |
| 88 } | |
| 89 | |
| 90 void GCTask::initialize() { | |
| 91 _older = NULL; | |
| 92 _newer = NULL; | |
| 93 } | |
| 94 | |
| 95 void GCTask::destruct() { | |
| 96 assert(older() == NULL, "shouldn't have an older task"); | |
| 97 assert(newer() == NULL, "shouldn't have a newer task"); | |
| 98 // Nothing to do. | |
| 99 } | |
| 100 | |
| 101 NOT_PRODUCT( | |
| 102 void GCTask::print(const char* message) const { | |
| 103 tty->print(INTPTR_FORMAT " <- " INTPTR_FORMAT "(%u) -> " INTPTR_FORMAT, | |
| 104 newer(), this, affinity(), older()); | |
| 105 } | |
| 106 ) | |
| 107 | |
| 108 // | |
| 109 // GCTaskQueue | |
| 110 // | |
| 111 | |
| 112 GCTaskQueue* GCTaskQueue::create() { | |
| 113 GCTaskQueue* result = new GCTaskQueue(false); | |
| 114 if (TraceGCTaskQueue) { | |
| 115 tty->print_cr("GCTaskQueue::create()" | |
| 116 " returns " INTPTR_FORMAT, result); | |
| 117 } | |
| 118 return result; | |
| 119 } | |
| 120 | |
| 121 GCTaskQueue* GCTaskQueue::create_on_c_heap() { | |
| 6197 | 122 GCTaskQueue* result = new(ResourceObj::C_HEAP, mtGC) GCTaskQueue(true); |
| 0 | 123 if (TraceGCTaskQueue) { |
| 124 tty->print_cr("GCTaskQueue::create_on_c_heap()" | |
| 125 " returns " INTPTR_FORMAT, | |
| 126 result); | |
| 127 } | |
| 128 return result; | |
| 129 } | |
| 130 | |
| 131 GCTaskQueue::GCTaskQueue(bool on_c_heap) : | |
| 132 _is_c_heap_obj(on_c_heap) { | |
| 133 initialize(); | |
| 134 if (TraceGCTaskQueue) { | |
| 135 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 136 " GCTaskQueue::GCTaskQueue() constructor", | |
| 137 this); | |
| 138 } | |
| 139 } | |
| 140 | |
| 141 void GCTaskQueue::destruct() { | |
| 142 // Nothing to do. | |
| 143 } | |
| 144 | |
| 145 void GCTaskQueue::destroy(GCTaskQueue* that) { | |
| 146 if (TraceGCTaskQueue) { | |
| 147 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 148 " GCTaskQueue::destroy()" | |
| 149 " is_c_heap_obj: %s", | |
| 150 that, | |
| 151 that->is_c_heap_obj() ? "true" : "false"); | |
| 152 } | |
| 153 // That instance may have been allocated as a CHeapObj, | |
| 154 // in which case we have to free it explicitly. | |
| 155 if (that != NULL) { | |
| 156 that->destruct(); | |
| 157 assert(that->is_empty(), "should be empty"); | |
| 158 if (that->is_c_heap_obj()) { | |
| 159 FreeHeap(that); | |
| 160 } | |
| 161 } | |
| 162 } | |
| 163 | |
| 164 void GCTaskQueue::initialize() { | |
| 165 set_insert_end(NULL); | |
| 166 set_remove_end(NULL); | |
| 167 set_length(0); | |
| 168 } | |
| 169 | |
| 170 // Enqueue one task. | |
| 171 void GCTaskQueue::enqueue(GCTask* task) { | |
| 172 if (TraceGCTaskQueue) { | |
| 173 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 174 " GCTaskQueue::enqueue(task: " | |
| 175 INTPTR_FORMAT ")", | |
| 176 this, task); | |
| 177 print("before:"); | |
| 178 } | |
| 179 assert(task != NULL, "shouldn't have null task"); | |
| 180 assert(task->older() == NULL, "shouldn't be on queue"); | |
| 181 assert(task->newer() == NULL, "shouldn't be on queue"); | |
| 182 task->set_newer(NULL); | |
| 183 task->set_older(insert_end()); | |
| 184 if (is_empty()) { | |
| 185 set_remove_end(task); | |
| 186 } else { | |
| 187 insert_end()->set_newer(task); | |
| 188 } | |
| 189 set_insert_end(task); | |
| 190 increment_length(); | |
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191 verify_length(); |
| 0 | 192 if (TraceGCTaskQueue) { |
| 193 print("after:"); | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 // Enqueue a whole list of tasks. Empties the argument list. | |
| 198 void GCTaskQueue::enqueue(GCTaskQueue* list) { | |
| 199 if (TraceGCTaskQueue) { | |
| 200 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 201 " GCTaskQueue::enqueue(list: " | |
| 202 INTPTR_FORMAT ")", | |
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203 this, list); |
| 0 | 204 print("before:"); |
| 205 list->print("list:"); | |
| 206 } | |
| 207 if (list->is_empty()) { | |
| 208 // Enqueuing the empty list: nothing to do. | |
| 209 return; | |
| 210 } | |
| 211 uint list_length = list->length(); | |
| 212 if (is_empty()) { | |
| 213 // Enqueuing to empty list: just acquire elements. | |
| 214 set_insert_end(list->insert_end()); | |
| 215 set_remove_end(list->remove_end()); | |
| 216 set_length(list_length); | |
| 217 } else { | |
| 218 // Prepend argument list to our queue. | |
| 219 list->remove_end()->set_older(insert_end()); | |
| 220 insert_end()->set_newer(list->remove_end()); | |
| 221 set_insert_end(list->insert_end()); | |
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222 set_length(length() + list_length); |
| 0 | 223 // empty the argument list. |
| 224 } | |
| 225 list->initialize(); | |
| 226 if (TraceGCTaskQueue) { | |
| 227 print("after:"); | |
| 228 list->print("list:"); | |
| 229 } | |
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230 verify_length(); |
| 0 | 231 } |
| 232 | |
| 233 // Dequeue one task. | |
| 234 GCTask* GCTaskQueue::dequeue() { | |
| 235 if (TraceGCTaskQueue) { | |
| 236 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 237 " GCTaskQueue::dequeue()", this); | |
| 238 print("before:"); | |
| 239 } | |
| 240 assert(!is_empty(), "shouldn't dequeue from empty list"); | |
| 241 GCTask* result = remove(); | |
| 242 assert(result != NULL, "shouldn't have NULL task"); | |
| 243 if (TraceGCTaskQueue) { | |
| 244 tty->print_cr(" return: " INTPTR_FORMAT, result); | |
| 245 print("after:"); | |
| 246 } | |
| 247 return result; | |
| 248 } | |
| 249 | |
| 250 // Dequeue one task, preferring one with affinity. | |
| 251 GCTask* GCTaskQueue::dequeue(uint affinity) { | |
| 252 if (TraceGCTaskQueue) { | |
| 253 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 254 " GCTaskQueue::dequeue(%u)", this, affinity); | |
| 255 print("before:"); | |
| 256 } | |
| 257 assert(!is_empty(), "shouldn't dequeue from empty list"); | |
| 258 // Look down to the next barrier for a task with this affinity. | |
| 259 GCTask* result = NULL; | |
| 260 for (GCTask* element = remove_end(); | |
| 261 element != NULL; | |
| 262 element = element->newer()) { | |
| 263 if (element->is_barrier_task()) { | |
| 264 // Don't consider barrier tasks, nor past them. | |
| 265 result = NULL; | |
| 266 break; | |
| 267 } | |
| 268 if (element->affinity() == affinity) { | |
| 269 result = remove(element); | |
| 270 break; | |
| 271 } | |
| 272 } | |
| 273 // If we didn't find anything with affinity, just take the next task. | |
| 274 if (result == NULL) { | |
| 275 result = remove(); | |
| 276 } | |
| 277 if (TraceGCTaskQueue) { | |
| 278 tty->print_cr(" return: " INTPTR_FORMAT, result); | |
| 279 print("after:"); | |
| 280 } | |
| 281 return result; | |
| 282 } | |
| 283 | |
| 284 GCTask* GCTaskQueue::remove() { | |
| 285 // Dequeue from remove end. | |
| 286 GCTask* result = remove_end(); | |
| 287 assert(result != NULL, "shouldn't have null task"); | |
| 288 assert(result->older() == NULL, "not the remove_end"); | |
| 289 set_remove_end(result->newer()); | |
| 290 if (remove_end() == NULL) { | |
| 291 assert(insert_end() == result, "not a singleton"); | |
| 292 set_insert_end(NULL); | |
| 293 } else { | |
| 294 remove_end()->set_older(NULL); | |
| 295 } | |
| 296 result->set_newer(NULL); | |
| 297 decrement_length(); | |
| 298 assert(result->newer() == NULL, "shouldn't be on queue"); | |
| 299 assert(result->older() == NULL, "shouldn't be on queue"); | |
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300 verify_length(); |
| 0 | 301 return result; |
| 302 } | |
| 303 | |
| 304 GCTask* GCTaskQueue::remove(GCTask* task) { | |
| 305 // This is slightly more work, and has slightly fewer asserts | |
| 306 // than removing from the remove end. | |
| 307 assert(task != NULL, "shouldn't have null task"); | |
| 308 GCTask* result = task; | |
| 309 if (result->newer() != NULL) { | |
| 310 result->newer()->set_older(result->older()); | |
| 311 } else { | |
| 312 assert(insert_end() == result, "not youngest"); | |
| 313 set_insert_end(result->older()); | |
| 314 } | |
| 315 if (result->older() != NULL) { | |
| 316 result->older()->set_newer(result->newer()); | |
| 317 } else { | |
| 318 assert(remove_end() == result, "not oldest"); | |
| 319 set_remove_end(result->newer()); | |
| 320 } | |
| 321 result->set_newer(NULL); | |
| 322 result->set_older(NULL); | |
| 323 decrement_length(); | |
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324 verify_length(); |
| 0 | 325 return result; |
| 326 } | |
| 327 | |
| 328 NOT_PRODUCT( | |
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329 // Count the elements in the queue and verify the length against |
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330 // that count. |
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331 void GCTaskQueue::verify_length() const { |
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332 uint count = 0; |
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333 for (GCTask* element = insert_end(); |
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334 element != NULL; |
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335 element = element->older()) { |
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336 |
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337 count++; |
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338 } |
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339 assert(count == length(), "Length does not match queue"); |
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340 } |
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341 |
| 0 | 342 void GCTaskQueue::print(const char* message) const { |
| 343 tty->print_cr("[" INTPTR_FORMAT "] GCTaskQueue:" | |
| 344 " insert_end: " INTPTR_FORMAT | |
| 345 " remove_end: " INTPTR_FORMAT | |
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346 " length: %d" |
| 0 | 347 " %s", |
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348 this, insert_end(), remove_end(), length(), message); |
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349 uint count = 0; |
| 0 | 350 for (GCTask* element = insert_end(); |
| 351 element != NULL; | |
| 352 element = element->older()) { | |
| 353 element->print(" "); | |
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354 count++; |
| 0 | 355 tty->cr(); |
| 356 } | |
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357 tty->print("Total tasks: %d", count); |
| 0 | 358 } |
| 359 ) | |
| 360 | |
| 361 // | |
| 362 // SynchronizedGCTaskQueue | |
| 363 // | |
| 364 | |
| 365 SynchronizedGCTaskQueue::SynchronizedGCTaskQueue(GCTaskQueue* queue_arg, | |
| 366 Monitor * lock_arg) : | |
| 367 _unsynchronized_queue(queue_arg), | |
| 368 _lock(lock_arg) { | |
| 369 assert(unsynchronized_queue() != NULL, "null queue"); | |
| 370 assert(lock() != NULL, "null lock"); | |
| 371 } | |
| 372 | |
| 373 SynchronizedGCTaskQueue::~SynchronizedGCTaskQueue() { | |
| 374 // Nothing to do. | |
| 375 } | |
| 376 | |
| 377 // | |
| 378 // GCTaskManager | |
| 379 // | |
| 380 GCTaskManager::GCTaskManager(uint workers) : | |
| 381 _workers(workers), | |
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382 _active_workers(0), |
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383 _idle_workers(0), |
| 0 | 384 _ndc(NULL) { |
| 385 initialize(); | |
| 386 } | |
| 387 | |
| 388 GCTaskManager::GCTaskManager(uint workers, NotifyDoneClosure* ndc) : | |
| 389 _workers(workers), | |
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390 _active_workers(0), |
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391 _idle_workers(0), |
| 0 | 392 _ndc(ndc) { |
| 393 initialize(); | |
| 394 } | |
| 395 | |
| 396 void GCTaskManager::initialize() { | |
| 397 if (TraceGCTaskManager) { | |
| 398 tty->print_cr("GCTaskManager::initialize: workers: %u", workers()); | |
| 399 } | |
| 400 assert(workers() != 0, "no workers"); | |
| 401 _monitor = new Monitor(Mutex::barrier, // rank | |
| 402 "GCTaskManager monitor", // name | |
| 403 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 404 // The queue for the GCTaskManager must be a CHeapObj. | |
| 405 GCTaskQueue* unsynchronized_queue = GCTaskQueue::create_on_c_heap(); | |
| 406 _queue = SynchronizedGCTaskQueue::create(unsynchronized_queue, lock()); | |
| 407 _noop_task = NoopGCTask::create_on_c_heap(); | |
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408 _idle_inactive_task = WaitForBarrierGCTask::create_on_c_heap(); |
| 6197 | 409 _resource_flag = NEW_C_HEAP_ARRAY(bool, workers(), mtGC); |
| 0 | 410 { |
| 411 // Set up worker threads. | |
| 412 // Distribute the workers among the available processors, | |
| 413 // unless we were told not to, or if the os doesn't want to. | |
| 6197 | 414 uint* processor_assignment = NEW_C_HEAP_ARRAY(uint, workers(), mtGC); |
| 0 | 415 if (!BindGCTaskThreadsToCPUs || |
| 416 !os::distribute_processes(workers(), processor_assignment)) { | |
| 417 for (uint a = 0; a < workers(); a += 1) { | |
| 418 processor_assignment[a] = sentinel_worker(); | |
| 419 } | |
| 420 } | |
| 6197 | 421 _thread = NEW_C_HEAP_ARRAY(GCTaskThread*, workers(), mtGC); |
| 0 | 422 for (uint t = 0; t < workers(); t += 1) { |
| 423 set_thread(t, GCTaskThread::create(this, t, processor_assignment[t])); | |
| 424 } | |
| 425 if (TraceGCTaskThread) { | |
| 426 tty->print("GCTaskManager::initialize: distribution:"); | |
| 427 for (uint t = 0; t < workers(); t += 1) { | |
| 428 tty->print(" %u", processor_assignment[t]); | |
| 429 } | |
| 430 tty->cr(); | |
| 431 } | |
| 6197 | 432 FREE_C_HEAP_ARRAY(uint, processor_assignment, mtGC); |
| 0 | 433 } |
| 434 reset_busy_workers(); | |
| 435 set_unblocked(); | |
| 436 for (uint w = 0; w < workers(); w += 1) { | |
| 437 set_resource_flag(w, false); | |
| 438 } | |
| 439 reset_delivered_tasks(); | |
| 440 reset_completed_tasks(); | |
| 441 reset_noop_tasks(); | |
| 442 reset_barriers(); | |
| 443 reset_emptied_queue(); | |
| 444 for (uint s = 0; s < workers(); s += 1) { | |
| 445 thread(s)->start(); | |
| 446 } | |
| 447 } | |
| 448 | |
| 449 GCTaskManager::~GCTaskManager() { | |
| 450 assert(busy_workers() == 0, "still have busy workers"); | |
| 451 assert(queue()->is_empty(), "still have queued work"); | |
| 452 NoopGCTask::destroy(_noop_task); | |
| 453 _noop_task = NULL; | |
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454 WaitForBarrierGCTask::destroy(_idle_inactive_task); |
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455 _idle_inactive_task = NULL; |
| 0 | 456 if (_thread != NULL) { |
| 457 for (uint i = 0; i < workers(); i += 1) { | |
| 458 GCTaskThread::destroy(thread(i)); | |
| 459 set_thread(i, NULL); | |
| 460 } | |
| 6197 | 461 FREE_C_HEAP_ARRAY(GCTaskThread*, _thread, mtGC); |
| 0 | 462 _thread = NULL; |
| 463 } | |
| 464 if (_resource_flag != NULL) { | |
| 6197 | 465 FREE_C_HEAP_ARRAY(bool, _resource_flag, mtGC); |
| 0 | 466 _resource_flag = NULL; |
| 467 } | |
| 468 if (queue() != NULL) { | |
| 469 GCTaskQueue* unsynchronized_queue = queue()->unsynchronized_queue(); | |
| 470 GCTaskQueue::destroy(unsynchronized_queue); | |
| 471 SynchronizedGCTaskQueue::destroy(queue()); | |
| 472 _queue = NULL; | |
| 473 } | |
| 474 if (monitor() != NULL) { | |
| 475 delete monitor(); | |
| 476 _monitor = NULL; | |
| 477 } | |
| 478 } | |
| 479 | |
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480 void GCTaskManager::set_active_gang() { |
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481 _active_workers = |
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482 AdaptiveSizePolicy::calc_active_workers(workers(), |
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483 active_workers(), |
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484 Threads::number_of_non_daemon_threads()); |
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485 |
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486 assert(!all_workers_active() || active_workers() == ParallelGCThreads, |
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487 err_msg("all_workers_active() is incorrect: " |
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488 "active %d ParallelGCThreads %d", active_workers(), |
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489 ParallelGCThreads)); |
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490 if (TraceDynamicGCThreads) { |
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491 gclog_or_tty->print_cr("GCTaskManager::set_active_gang(): " |
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492 "all_workers_active() %d workers %d " |
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493 "active %d ParallelGCThreads %d ", |
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494 all_workers_active(), workers(), active_workers(), |
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495 ParallelGCThreads); |
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496 } |
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497 } |
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498 |
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499 // Create IdleGCTasks for inactive workers. |
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500 // Creates tasks in a ResourceArea and assumes |
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501 // an appropriate ResourceMark. |
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502 void GCTaskManager::task_idle_workers() { |
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503 { |
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504 int more_inactive_workers = 0; |
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505 { |
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506 // Stop any idle tasks from exiting their IdleGCTask's |
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507 // and get the count for additional IdleGCTask's under |
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508 // the GCTaskManager's monitor so that the "more_inactive_workers" |
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509 // count is correct. |
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510 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
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511 _idle_inactive_task->set_should_wait(true); |
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512 // active_workers are a number being requested. idle_workers |
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513 // are the number currently idle. If all the workers are being |
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514 // requested to be active but some are already idle, reduce |
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515 // the number of active_workers to be consistent with the |
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516 // number of idle_workers. The idle_workers are stuck in |
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517 // idle tasks and will no longer be release (since a new GC |
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518 // is starting). Try later to release enough idle_workers |
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519 // to allow the desired number of active_workers. |
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520 more_inactive_workers = |
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521 workers() - active_workers() - idle_workers(); |
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522 if (more_inactive_workers < 0) { |
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523 int reduced_active_workers = active_workers() + more_inactive_workers; |
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524 set_active_workers(reduced_active_workers); |
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525 more_inactive_workers = 0; |
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526 } |
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527 if (TraceDynamicGCThreads) { |
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528 gclog_or_tty->print_cr("JT: %d workers %d active %d " |
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529 "idle %d more %d", |
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530 Threads::number_of_non_daemon_threads(), |
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531 workers(), |
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532 active_workers(), |
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533 idle_workers(), |
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534 more_inactive_workers); |
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535 } |
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536 } |
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537 GCTaskQueue* q = GCTaskQueue::create(); |
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538 for(uint i = 0; i < (uint) more_inactive_workers; i++) { |
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539 q->enqueue(IdleGCTask::create_on_c_heap()); |
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540 increment_idle_workers(); |
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541 } |
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542 assert(workers() == active_workers() + idle_workers(), |
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543 "total workers should equal active + inactive"); |
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544 add_list(q); |
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545 // GCTaskQueue* q was created in a ResourceArea so a |
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546 // destroy() call is not needed. |
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547 } |
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548 } |
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549 |
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550 void GCTaskManager::release_idle_workers() { |
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551 { |
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552 MutexLockerEx ml(monitor(), |
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553 Mutex::_no_safepoint_check_flag); |
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554 _idle_inactive_task->set_should_wait(false); |
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555 monitor()->notify_all(); |
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556 // Release monitor |
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557 } |
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558 } |
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559 |
| 0 | 560 void GCTaskManager::print_task_time_stamps() { |
| 561 for(uint i=0; i<ParallelGCThreads; i++) { | |
| 562 GCTaskThread* t = thread(i); | |
| 563 t->print_task_time_stamps(); | |
| 564 } | |
| 565 } | |
| 566 | |
| 567 void GCTaskManager::print_threads_on(outputStream* st) { | |
| 568 uint num_thr = workers(); | |
| 569 for (uint i = 0; i < num_thr; i++) { | |
| 570 thread(i)->print_on(st); | |
| 571 st->cr(); | |
| 572 } | |
| 573 } | |
| 574 | |
| 575 void GCTaskManager::threads_do(ThreadClosure* tc) { | |
| 576 assert(tc != NULL, "Null ThreadClosure"); | |
| 577 uint num_thr = workers(); | |
| 578 for (uint i = 0; i < num_thr; i++) { | |
| 579 tc->do_thread(thread(i)); | |
| 580 } | |
| 581 } | |
| 582 | |
| 583 GCTaskThread* GCTaskManager::thread(uint which) { | |
| 584 assert(which < workers(), "index out of bounds"); | |
| 585 assert(_thread[which] != NULL, "shouldn't have null thread"); | |
| 586 return _thread[which]; | |
| 587 } | |
| 588 | |
| 589 void GCTaskManager::set_thread(uint which, GCTaskThread* value) { | |
| 590 assert(which < workers(), "index out of bounds"); | |
| 591 assert(value != NULL, "shouldn't have null thread"); | |
| 592 _thread[which] = value; | |
| 593 } | |
| 594 | |
| 595 void GCTaskManager::add_task(GCTask* task) { | |
| 596 assert(task != NULL, "shouldn't have null task"); | |
| 597 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 598 if (TraceGCTaskManager) { | |
| 599 tty->print_cr("GCTaskManager::add_task(" INTPTR_FORMAT " [%s])", | |
| 600 task, GCTask::Kind::to_string(task->kind())); | |
| 601 } | |
| 602 queue()->enqueue(task); | |
| 603 // Notify with the lock held to avoid missed notifies. | |
| 604 if (TraceGCTaskManager) { | |
| 605 tty->print_cr(" GCTaskManager::add_task (%s)->notify_all", | |
| 606 monitor()->name()); | |
| 607 } | |
| 608 (void) monitor()->notify_all(); | |
| 609 // Release monitor(). | |
| 610 } | |
| 611 | |
| 612 void GCTaskManager::add_list(GCTaskQueue* list) { | |
| 613 assert(list != NULL, "shouldn't have null task"); | |
| 614 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 615 if (TraceGCTaskManager) { | |
| 616 tty->print_cr("GCTaskManager::add_list(%u)", list->length()); | |
| 617 } | |
| 618 queue()->enqueue(list); | |
| 619 // Notify with the lock held to avoid missed notifies. | |
| 620 if (TraceGCTaskManager) { | |
| 621 tty->print_cr(" GCTaskManager::add_list (%s)->notify_all", | |
| 622 monitor()->name()); | |
| 623 } | |
| 624 (void) monitor()->notify_all(); | |
| 625 // Release monitor(). | |
| 626 } | |
| 627 | |
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628 // GC workers wait in get_task() for new work to be added |
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629 // to the GCTaskManager's queue. When new work is added, |
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630 // a notify is sent to the waiting GC workers which then |
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631 // compete to get tasks. If a GC worker wakes up and there |
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632 // is no work on the queue, it is given a noop_task to execute |
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633 // and then loops to find more work. |
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634 |
| 0 | 635 GCTask* GCTaskManager::get_task(uint which) { |
| 636 GCTask* result = NULL; | |
| 637 // Grab the queue lock. | |
| 638 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 639 // Wait while the queue is block or | |
| 640 // there is nothing to do, except maybe release resources. | |
| 641 while (is_blocked() || | |
| 642 (queue()->is_empty() && !should_release_resources(which))) { | |
| 643 if (TraceGCTaskManager) { | |
| 644 tty->print_cr("GCTaskManager::get_task(%u)" | |
| 645 " blocked: %s" | |
| 646 " empty: %s" | |
| 647 " release: %s", | |
| 648 which, | |
| 649 is_blocked() ? "true" : "false", | |
| 650 queue()->is_empty() ? "true" : "false", | |
| 651 should_release_resources(which) ? "true" : "false"); | |
| 652 tty->print_cr(" => (%s)->wait()", | |
| 653 monitor()->name()); | |
| 654 } | |
| 655 monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 656 } | |
| 657 // We've reacquired the queue lock here. | |
| 658 // Figure out which condition caused us to exit the loop above. | |
| 659 if (!queue()->is_empty()) { | |
| 660 if (UseGCTaskAffinity) { | |
| 661 result = queue()->dequeue(which); | |
| 662 } else { | |
| 663 result = queue()->dequeue(); | |
| 664 } | |
| 665 if (result->is_barrier_task()) { | |
| 666 assert(which != sentinel_worker(), | |
| 667 "blocker shouldn't be bogus"); | |
| 668 set_blocking_worker(which); | |
| 669 } | |
| 670 } else { | |
| 671 // The queue is empty, but we were woken up. | |
| 672 // Just hand back a Noop task, | |
| 673 // in case someone wanted us to release resources, or whatever. | |
| 674 result = noop_task(); | |
| 675 increment_noop_tasks(); | |
| 676 } | |
| 677 assert(result != NULL, "shouldn't have null task"); | |
| 678 if (TraceGCTaskManager) { | |
| 679 tty->print_cr("GCTaskManager::get_task(%u) => " INTPTR_FORMAT " [%s]", | |
| 680 which, result, GCTask::Kind::to_string(result->kind())); | |
| 681 tty->print_cr(" %s", result->name()); | |
| 682 } | |
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683 if (!result->is_idle_task()) { |
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684 increment_busy_workers(); |
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685 increment_delivered_tasks(); |
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686 } |
| 0 | 687 return result; |
| 688 // Release monitor(). | |
| 689 } | |
| 690 | |
| 691 void GCTaskManager::note_completion(uint which) { | |
| 692 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 693 if (TraceGCTaskManager) { | |
| 694 tty->print_cr("GCTaskManager::note_completion(%u)", which); | |
| 695 } | |
| 696 // If we are blocked, check if the completing thread is the blocker. | |
| 697 if (blocking_worker() == which) { | |
| 698 assert(blocking_worker() != sentinel_worker(), | |
| 699 "blocker shouldn't be bogus"); | |
| 700 increment_barriers(); | |
| 701 set_unblocked(); | |
| 702 } | |
| 703 increment_completed_tasks(); | |
| 704 uint active = decrement_busy_workers(); | |
| 705 if ((active == 0) && (queue()->is_empty())) { | |
| 706 increment_emptied_queue(); | |
| 707 if (TraceGCTaskManager) { | |
| 708 tty->print_cr(" GCTaskManager::note_completion(%u) done", which); | |
| 709 } | |
| 710 // Notify client that we are done. | |
| 711 NotifyDoneClosure* ndc = notify_done_closure(); | |
| 712 if (ndc != NULL) { | |
| 713 ndc->notify(this); | |
| 714 } | |
| 715 } | |
| 716 if (TraceGCTaskManager) { | |
| 717 tty->print_cr(" GCTaskManager::note_completion(%u) (%s)->notify_all", | |
| 718 which, monitor()->name()); | |
| 719 tty->print_cr(" " | |
| 720 " blocked: %s" | |
| 721 " empty: %s" | |
| 722 " release: %s", | |
| 723 is_blocked() ? "true" : "false", | |
| 724 queue()->is_empty() ? "true" : "false", | |
| 725 should_release_resources(which) ? "true" : "false"); | |
| 726 tty->print_cr(" " | |
| 727 " delivered: %u" | |
| 728 " completed: %u" | |
| 729 " barriers: %u" | |
| 730 " emptied: %u", | |
| 731 delivered_tasks(), | |
| 732 completed_tasks(), | |
| 733 barriers(), | |
| 734 emptied_queue()); | |
| 735 } | |
| 736 // Tell everyone that a task has completed. | |
| 737 (void) monitor()->notify_all(); | |
| 738 // Release monitor(). | |
| 739 } | |
| 740 | |
| 741 uint GCTaskManager::increment_busy_workers() { | |
| 742 assert(queue()->own_lock(), "don't own the lock"); | |
| 743 _busy_workers += 1; | |
| 744 return _busy_workers; | |
| 745 } | |
| 746 | |
| 747 uint GCTaskManager::decrement_busy_workers() { | |
| 748 assert(queue()->own_lock(), "don't own the lock"); | |
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749 assert(_busy_workers > 0, "About to make a mistake"); |
| 0 | 750 _busy_workers -= 1; |
| 751 return _busy_workers; | |
| 752 } | |
| 753 | |
| 754 void GCTaskManager::release_all_resources() { | |
| 755 // If you want this to be done atomically, do it in a BarrierGCTask. | |
| 756 for (uint i = 0; i < workers(); i += 1) { | |
| 757 set_resource_flag(i, true); | |
| 758 } | |
| 759 } | |
| 760 | |
| 761 bool GCTaskManager::should_release_resources(uint which) { | |
| 762 // This can be done without a lock because each thread reads one element. | |
| 763 return resource_flag(which); | |
| 764 } | |
| 765 | |
| 766 void GCTaskManager::note_release(uint which) { | |
| 767 // This can be done without a lock because each thread writes one element. | |
| 768 set_resource_flag(which, false); | |
| 769 } | |
| 770 | |
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771 // "list" contains tasks that are ready to execute. Those |
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772 // tasks are added to the GCTaskManager's queue of tasks and |
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773 // then the GC workers are notified that there is new work to |
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774 // do. |
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775 // |
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776 // Typically different types of tasks can be added to the "list". |
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777 // For example in PSScavenge OldToYoungRootsTask, SerialOldToYoungRootsTask, |
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778 // ScavengeRootsTask, and StealTask tasks are all added to the list |
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779 // and then the GC workers are notified of new work. The tasks are |
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780 // handed out in the order in which they are added to the list |
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781 // (although execution is not necessarily in that order). As long |
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782 // as any tasks are running the GCTaskManager will wait for execution |
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783 // to complete. GC workers that execute a stealing task remain in |
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784 // the stealing task until all stealing tasks have completed. The load |
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785 // balancing afforded by the stealing tasks work best if the stealing |
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786 // tasks are added last to the list. |
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787 |
| 0 | 788 void GCTaskManager::execute_and_wait(GCTaskQueue* list) { |
| 789 WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); | |
| 790 list->enqueue(fin); | |
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791 // The barrier task will be read by one of the GC |
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792 // workers once it is added to the list of tasks. |
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793 // Be sure that is globally visible before the |
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794 // GC worker reads it (which is after the task is added |
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795 // to the list of tasks below). |
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796 OrderAccess::storestore(); |
| 0 | 797 add_list(list); |
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798 fin->wait_for(true /* reset */); |
| 0 | 799 // We have to release the barrier tasks! |
| 800 WaitForBarrierGCTask::destroy(fin); | |
| 801 } | |
| 802 | |
| 803 bool GCTaskManager::resource_flag(uint which) { | |
| 804 assert(which < workers(), "index out of bounds"); | |
| 805 return _resource_flag[which]; | |
| 806 } | |
| 807 | |
| 808 void GCTaskManager::set_resource_flag(uint which, bool value) { | |
| 809 assert(which < workers(), "index out of bounds"); | |
| 810 _resource_flag[which] = value; | |
| 811 } | |
| 812 | |
| 813 // | |
| 814 // NoopGCTask | |
| 815 // | |
| 816 | |
| 817 NoopGCTask* NoopGCTask::create() { | |
| 818 NoopGCTask* result = new NoopGCTask(false); | |
| 819 return result; | |
| 820 } | |
| 821 | |
| 822 NoopGCTask* NoopGCTask::create_on_c_heap() { | |
| 6197 | 823 NoopGCTask* result = new(ResourceObj::C_HEAP, mtGC) NoopGCTask(true); |
| 0 | 824 return result; |
| 825 } | |
| 826 | |
| 827 void NoopGCTask::destroy(NoopGCTask* that) { | |
| 828 if (that != NULL) { | |
| 829 that->destruct(); | |
| 830 if (that->is_c_heap_obj()) { | |
| 831 FreeHeap(that); | |
| 832 } | |
| 833 } | |
| 834 } | |
| 835 | |
| 836 void NoopGCTask::destruct() { | |
| 837 // This has to know it's superclass structure, just like the constructor. | |
| 838 this->GCTask::destruct(); | |
| 839 // Nothing else to do. | |
| 840 } | |
| 841 | |
| 842 // | |
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843 // IdleGCTask |
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844 // |
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845 |
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846 IdleGCTask* IdleGCTask::create() { |
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847 IdleGCTask* result = new IdleGCTask(false); |
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848 assert(UseDynamicNumberOfGCThreads, |
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849 "Should only be used with dynamic GC thread"); |
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850 return result; |
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851 } |
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852 |
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853 IdleGCTask* IdleGCTask::create_on_c_heap() { |
| 6197 | 854 IdleGCTask* result = new(ResourceObj::C_HEAP, mtGC) IdleGCTask(true); |
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855 assert(UseDynamicNumberOfGCThreads, |
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856 "Should only be used with dynamic GC thread"); |
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857 return result; |
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858 } |
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859 |
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860 void IdleGCTask::do_it(GCTaskManager* manager, uint which) { |
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861 WaitForBarrierGCTask* wait_for_task = manager->idle_inactive_task(); |
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862 if (TraceGCTaskManager) { |
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863 tty->print_cr("[" INTPTR_FORMAT "]" |
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864 " IdleGCTask:::do_it()" |
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865 " should_wait: %s", |
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866 this, wait_for_task->should_wait() ? "true" : "false"); |
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867 } |
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868 MutexLockerEx ml(manager->monitor(), Mutex::_no_safepoint_check_flag); |
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869 if (TraceDynamicGCThreads) { |
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870 gclog_or_tty->print_cr("--- idle %d", which); |
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871 } |
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872 // Increment has to be done when the idle tasks are created. |
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873 // manager->increment_idle_workers(); |
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874 manager->monitor()->notify_all(); |
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875 while (wait_for_task->should_wait()) { |
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876 if (TraceGCTaskManager) { |
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877 tty->print_cr("[" INTPTR_FORMAT "]" |
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878 " IdleGCTask::do_it()" |
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879 " [" INTPTR_FORMAT "] (%s)->wait()", |
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880 this, manager->monitor(), manager->monitor()->name()); |
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881 } |
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882 manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
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883 } |
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884 manager->decrement_idle_workers(); |
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885 if (TraceDynamicGCThreads) { |
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886 gclog_or_tty->print_cr("--- release %d", which); |
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887 } |
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888 if (TraceGCTaskManager) { |
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889 tty->print_cr("[" INTPTR_FORMAT "]" |
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890 " IdleGCTask::do_it() returns" |
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891 " should_wait: %s", |
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892 this, wait_for_task->should_wait() ? "true" : "false"); |
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893 } |
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894 // Release monitor(). |
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895 } |
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896 |
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897 void IdleGCTask::destroy(IdleGCTask* that) { |
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898 if (that != NULL) { |
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899 that->destruct(); |
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900 if (that->is_c_heap_obj()) { |
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901 FreeHeap(that); |
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902 } |
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903 } |
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904 } |
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905 |
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906 void IdleGCTask::destruct() { |
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907 // This has to know it's superclass structure, just like the constructor. |
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908 this->GCTask::destruct(); |
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909 // Nothing else to do. |
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910 } |
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911 |
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912 // |
| 0 | 913 // BarrierGCTask |
| 914 // | |
| 915 | |
| 916 void BarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 917 // Wait for this to be the only busy worker. | |
| 918 // ??? I thought of having a StackObj class | |
| 919 // whose constructor would grab the lock and come to the barrier, | |
| 920 // and whose destructor would release the lock, | |
| 921 // but that seems like too much mechanism for two lines of code. | |
| 922 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 923 do_it_internal(manager, which); | |
| 924 // Release manager->lock(). | |
| 925 } | |
| 926 | |
| 927 void BarrierGCTask::do_it_internal(GCTaskManager* manager, uint which) { | |
| 928 // Wait for this to be the only busy worker. | |
| 929 assert(manager->monitor()->owned_by_self(), "don't own the lock"); | |
| 930 assert(manager->is_blocked(), "manager isn't blocked"); | |
| 931 while (manager->busy_workers() > 1) { | |
| 932 if (TraceGCTaskManager) { | |
| 933 tty->print_cr("BarrierGCTask::do_it(%u) waiting on %u workers", | |
| 934 which, manager->busy_workers()); | |
| 935 } | |
| 936 manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 937 } | |
| 938 } | |
| 939 | |
| 940 void BarrierGCTask::destruct() { | |
| 941 this->GCTask::destruct(); | |
| 942 // Nothing else to do. | |
| 943 } | |
| 944 | |
| 945 // | |
| 946 // ReleasingBarrierGCTask | |
| 947 // | |
| 948 | |
| 949 void ReleasingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 950 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 951 do_it_internal(manager, which); | |
| 952 manager->release_all_resources(); | |
| 953 // Release manager->lock(). | |
| 954 } | |
| 955 | |
| 956 void ReleasingBarrierGCTask::destruct() { | |
| 957 this->BarrierGCTask::destruct(); | |
| 958 // Nothing else to do. | |
| 959 } | |
| 960 | |
| 961 // | |
| 962 // NotifyingBarrierGCTask | |
| 963 // | |
| 964 | |
| 965 void NotifyingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 966 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 967 do_it_internal(manager, which); | |
| 968 NotifyDoneClosure* ndc = notify_done_closure(); | |
| 969 if (ndc != NULL) { | |
| 970 ndc->notify(manager); | |
| 971 } | |
| 972 // Release manager->lock(). | |
| 973 } | |
| 974 | |
| 975 void NotifyingBarrierGCTask::destruct() { | |
| 976 this->BarrierGCTask::destruct(); | |
| 977 // Nothing else to do. | |
| 978 } | |
| 979 | |
| 980 // | |
| 981 // WaitForBarrierGCTask | |
| 982 // | |
| 983 WaitForBarrierGCTask* WaitForBarrierGCTask::create() { | |
| 984 WaitForBarrierGCTask* result = new WaitForBarrierGCTask(false); | |
| 985 return result; | |
| 986 } | |
| 987 | |
| 988 WaitForBarrierGCTask* WaitForBarrierGCTask::create_on_c_heap() { | |
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989 WaitForBarrierGCTask* result = |
| 6197 | 990 new (ResourceObj::C_HEAP, mtGC) WaitForBarrierGCTask(true); |
| 0 | 991 return result; |
| 992 } | |
| 993 | |
| 994 WaitForBarrierGCTask::WaitForBarrierGCTask(bool on_c_heap) : | |
| 995 _is_c_heap_obj(on_c_heap) { | |
| 996 _monitor = MonitorSupply::reserve(); | |
| 997 set_should_wait(true); | |
| 998 if (TraceGCTaskManager) { | |
| 999 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1000 " WaitForBarrierGCTask::WaitForBarrierGCTask()" | |
| 1001 " monitor: " INTPTR_FORMAT, | |
| 1002 this, monitor()); | |
| 1003 } | |
| 1004 } | |
| 1005 | |
| 1006 void WaitForBarrierGCTask::destroy(WaitForBarrierGCTask* that) { | |
| 1007 if (that != NULL) { | |
| 1008 if (TraceGCTaskManager) { | |
| 1009 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1010 " WaitForBarrierGCTask::destroy()" | |
| 1011 " is_c_heap_obj: %s" | |
| 1012 " monitor: " INTPTR_FORMAT, | |
| 1013 that, | |
| 1014 that->is_c_heap_obj() ? "true" : "false", | |
| 1015 that->monitor()); | |
| 1016 } | |
| 1017 that->destruct(); | |
| 1018 if (that->is_c_heap_obj()) { | |
| 1019 FreeHeap(that); | |
| 1020 } | |
| 1021 } | |
| 1022 } | |
| 1023 | |
| 1024 void WaitForBarrierGCTask::destruct() { | |
| 1025 assert(monitor() != NULL, "monitor should not be NULL"); | |
| 1026 if (TraceGCTaskManager) { | |
| 1027 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1028 " WaitForBarrierGCTask::destruct()" | |
| 1029 " monitor: " INTPTR_FORMAT, | |
| 1030 this, monitor()); | |
| 1031 } | |
| 1032 this->BarrierGCTask::destruct(); | |
| 1033 // Clean up that should be in the destructor, | |
| 1034 // except that ResourceMarks don't call destructors. | |
| 1035 if (monitor() != NULL) { | |
| 1036 MonitorSupply::release(monitor()); | |
| 1037 } | |
| 1038 _monitor = (Monitor*) 0xDEAD000F; | |
| 1039 } | |
| 1040 | |
| 1041 void WaitForBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 1042 if (TraceGCTaskManager) { | |
| 1043 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1044 " WaitForBarrierGCTask::do_it() waiting for idle" | |
| 1045 " monitor: " INTPTR_FORMAT, | |
| 1046 this, monitor()); | |
| 1047 } | |
| 1048 { | |
| 1049 // First, wait for the barrier to arrive. | |
| 1050 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 1051 do_it_internal(manager, which); | |
| 1052 // Release manager->lock(). | |
| 1053 } | |
| 1054 { | |
| 1055 // Then notify the waiter. | |
| 1056 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 1057 set_should_wait(false); | |
| 1058 // Waiter doesn't miss the notify in the wait_for method | |
| 1059 // since it checks the flag after grabbing the monitor. | |
| 1060 if (TraceGCTaskManager) { | |
| 1061 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1062 " WaitForBarrierGCTask::do_it()" | |
| 1063 " [" INTPTR_FORMAT "] (%s)->notify_all()", | |
| 1064 this, monitor(), monitor()->name()); | |
| 1065 } | |
| 1066 monitor()->notify_all(); | |
| 1067 // Release monitor(). | |
| 1068 } | |
| 1069 } | |
| 1070 | |
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1071 void WaitForBarrierGCTask::wait_for(bool reset) { |
| 0 | 1072 if (TraceGCTaskManager) { |
| 1073 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1074 " WaitForBarrierGCTask::wait_for()" | |
| 1075 " should_wait: %s", | |
| 1076 this, should_wait() ? "true" : "false"); | |
| 1077 } | |
| 1078 { | |
| 1079 // Grab the lock and check again. | |
| 1080 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 1081 while (should_wait()) { | |
| 1082 if (TraceGCTaskManager) { | |
| 1083 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1084 " WaitForBarrierGCTask::wait_for()" | |
| 1085 " [" INTPTR_FORMAT "] (%s)->wait()", | |
| 1086 this, monitor(), monitor()->name()); | |
| 1087 } | |
| 1088 monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 1089 } | |
| 1090 // Reset the flag in case someone reuses this task. | |
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1091 if (reset) { |
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1092 set_should_wait(true); |
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1093 } |
| 0 | 1094 if (TraceGCTaskManager) { |
| 1095 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1096 " WaitForBarrierGCTask::wait_for() returns" | |
| 1097 " should_wait: %s", | |
| 1098 this, should_wait() ? "true" : "false"); | |
| 1099 } | |
| 1100 // Release monitor(). | |
| 1101 } | |
| 1102 } | |
| 1103 | |
| 1104 Mutex* MonitorSupply::_lock = NULL; | |
| 1105 GrowableArray<Monitor*>* MonitorSupply::_freelist = NULL; | |
| 1106 | |
| 1107 Monitor* MonitorSupply::reserve() { | |
| 1108 Monitor* result = NULL; | |
| 1109 // Lazy initialization: possible race. | |
| 1110 if (lock() == NULL) { | |
| 1111 _lock = new Mutex(Mutex::barrier, // rank | |
| 1112 "MonitorSupply mutex", // name | |
| 1113 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 1114 } | |
| 1115 { | |
| 1116 MutexLockerEx ml(lock()); | |
| 1117 // Lazy initialization. | |
| 1118 if (freelist() == NULL) { | |
| 1119 _freelist = | |
| 6197 | 1120 new(ResourceObj::C_HEAP, mtGC) GrowableArray<Monitor*>(ParallelGCThreads, |
| 0 | 1121 true); |
| 1122 } | |
| 1123 if (! freelist()->is_empty()) { | |
| 1124 result = freelist()->pop(); | |
| 1125 } else { | |
| 1126 result = new Monitor(Mutex::barrier, // rank | |
| 1127 "MonitorSupply monitor", // name | |
| 1128 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 1129 } | |
| 1130 guarantee(result != NULL, "shouldn't return NULL"); | |
| 1131 assert(!result->is_locked(), "shouldn't be locked"); | |
| 1132 // release lock(). | |
| 1133 } | |
| 1134 return result; | |
| 1135 } | |
| 1136 | |
| 1137 void MonitorSupply::release(Monitor* instance) { | |
| 1138 assert(instance != NULL, "shouldn't release NULL"); | |
| 1139 assert(!instance->is_locked(), "shouldn't be locked"); | |
| 1140 { | |
| 1141 MutexLockerEx ml(lock()); | |
| 1142 freelist()->push(instance); | |
| 1143 // release lock(). | |
| 1144 } | |
| 1145 } |