Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.cpp @ 4111:55d777c0860a
7118648: disable compressed oops by default on MacOS X until 7118647 is fixed
Summary: UseCompressedOops is false by default on MacOS X; can still be set manually
Reviewed-by: jmelvin, kvn, dholmes
| author | dcubed |
|---|---|
| date | Wed, 07 Dec 2011 07:27:09 -0800 |
| parents | bca17e38de00 |
| children | 6d7d0790074d |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 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 |
| 34 // | |
| 35 // GCTask | |
| 36 // | |
| 37 | |
| 38 const char* GCTask::Kind::to_string(kind value) { | |
| 39 const char* result = "unknown GCTask kind"; | |
| 40 switch (value) { | |
| 41 default: | |
| 42 result = "unknown GCTask kind"; | |
| 43 break; | |
| 44 case unknown_task: | |
| 45 result = "unknown task"; | |
| 46 break; | |
| 47 case ordinary_task: | |
| 48 result = "ordinary task"; | |
| 49 break; | |
| 50 case barrier_task: | |
| 51 result = "barrier task"; | |
| 52 break; | |
| 53 case noop_task: | |
| 54 result = "noop task"; | |
| 55 break; | |
| 56 } | |
| 57 return result; | |
| 58 }; | |
| 59 | |
| 60 GCTask::GCTask() : | |
| 61 _kind(Kind::ordinary_task), | |
| 62 _affinity(GCTaskManager::sentinel_worker()){ | |
| 63 initialize(); | |
| 64 } | |
| 65 | |
| 66 GCTask::GCTask(Kind::kind kind) : | |
| 67 _kind(kind), | |
| 68 _affinity(GCTaskManager::sentinel_worker()) { | |
| 69 initialize(); | |
| 70 } | |
| 71 | |
| 72 GCTask::GCTask(uint affinity) : | |
| 73 _kind(Kind::ordinary_task), | |
| 74 _affinity(affinity) { | |
| 75 initialize(); | |
| 76 } | |
| 77 | |
| 78 GCTask::GCTask(Kind::kind kind, uint affinity) : | |
| 79 _kind(kind), | |
| 80 _affinity(affinity) { | |
| 81 initialize(); | |
| 82 } | |
| 83 | |
| 84 void GCTask::initialize() { | |
| 85 _older = NULL; | |
| 86 _newer = NULL; | |
| 87 } | |
| 88 | |
| 89 void GCTask::destruct() { | |
| 90 assert(older() == NULL, "shouldn't have an older task"); | |
| 91 assert(newer() == NULL, "shouldn't have a newer task"); | |
| 92 // Nothing to do. | |
| 93 } | |
| 94 | |
| 95 NOT_PRODUCT( | |
| 96 void GCTask::print(const char* message) const { | |
| 97 tty->print(INTPTR_FORMAT " <- " INTPTR_FORMAT "(%u) -> " INTPTR_FORMAT, | |
| 98 newer(), this, affinity(), older()); | |
| 99 } | |
| 100 ) | |
| 101 | |
| 102 // | |
| 103 // GCTaskQueue | |
| 104 // | |
| 105 | |
| 106 GCTaskQueue* GCTaskQueue::create() { | |
| 107 GCTaskQueue* result = new GCTaskQueue(false); | |
| 108 if (TraceGCTaskQueue) { | |
| 109 tty->print_cr("GCTaskQueue::create()" | |
| 110 " returns " INTPTR_FORMAT, result); | |
| 111 } | |
| 112 return result; | |
| 113 } | |
| 114 | |
| 115 GCTaskQueue* GCTaskQueue::create_on_c_heap() { | |
| 116 GCTaskQueue* result = new(ResourceObj::C_HEAP) GCTaskQueue(true); | |
| 117 if (TraceGCTaskQueue) { | |
| 118 tty->print_cr("GCTaskQueue::create_on_c_heap()" | |
| 119 " returns " INTPTR_FORMAT, | |
| 120 result); | |
| 121 } | |
| 122 return result; | |
| 123 } | |
| 124 | |
| 125 GCTaskQueue::GCTaskQueue(bool on_c_heap) : | |
| 126 _is_c_heap_obj(on_c_heap) { | |
| 127 initialize(); | |
| 128 if (TraceGCTaskQueue) { | |
| 129 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 130 " GCTaskQueue::GCTaskQueue() constructor", | |
| 131 this); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 void GCTaskQueue::destruct() { | |
| 136 // Nothing to do. | |
| 137 } | |
| 138 | |
| 139 void GCTaskQueue::destroy(GCTaskQueue* that) { | |
| 140 if (TraceGCTaskQueue) { | |
| 141 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 142 " GCTaskQueue::destroy()" | |
| 143 " is_c_heap_obj: %s", | |
| 144 that, | |
| 145 that->is_c_heap_obj() ? "true" : "false"); | |
| 146 } | |
| 147 // That instance may have been allocated as a CHeapObj, | |
| 148 // in which case we have to free it explicitly. | |
| 149 if (that != NULL) { | |
| 150 that->destruct(); | |
| 151 assert(that->is_empty(), "should be empty"); | |
| 152 if (that->is_c_heap_obj()) { | |
| 153 FreeHeap(that); | |
| 154 } | |
| 155 } | |
| 156 } | |
| 157 | |
| 158 void GCTaskQueue::initialize() { | |
| 159 set_insert_end(NULL); | |
| 160 set_remove_end(NULL); | |
| 161 set_length(0); | |
| 162 } | |
| 163 | |
| 164 // Enqueue one task. | |
| 165 void GCTaskQueue::enqueue(GCTask* task) { | |
| 166 if (TraceGCTaskQueue) { | |
| 167 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 168 " GCTaskQueue::enqueue(task: " | |
| 169 INTPTR_FORMAT ")", | |
| 170 this, task); | |
| 171 print("before:"); | |
| 172 } | |
| 173 assert(task != NULL, "shouldn't have null task"); | |
| 174 assert(task->older() == NULL, "shouldn't be on queue"); | |
| 175 assert(task->newer() == NULL, "shouldn't be on queue"); | |
| 176 task->set_newer(NULL); | |
| 177 task->set_older(insert_end()); | |
| 178 if (is_empty()) { | |
| 179 set_remove_end(task); | |
| 180 } else { | |
| 181 insert_end()->set_newer(task); | |
| 182 } | |
| 183 set_insert_end(task); | |
| 184 increment_length(); | |
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185 verify_length(); |
| 0 | 186 if (TraceGCTaskQueue) { |
| 187 print("after:"); | |
| 188 } | |
| 189 } | |
| 190 | |
| 191 // Enqueue a whole list of tasks. Empties the argument list. | |
| 192 void GCTaskQueue::enqueue(GCTaskQueue* list) { | |
| 193 if (TraceGCTaskQueue) { | |
| 194 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 195 " GCTaskQueue::enqueue(list: " | |
| 196 INTPTR_FORMAT ")", | |
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197 this, list); |
| 0 | 198 print("before:"); |
| 199 list->print("list:"); | |
| 200 } | |
| 201 if (list->is_empty()) { | |
| 202 // Enqueuing the empty list: nothing to do. | |
| 203 return; | |
| 204 } | |
| 205 uint list_length = list->length(); | |
| 206 if (is_empty()) { | |
| 207 // Enqueuing to empty list: just acquire elements. | |
| 208 set_insert_end(list->insert_end()); | |
| 209 set_remove_end(list->remove_end()); | |
| 210 set_length(list_length); | |
| 211 } else { | |
| 212 // Prepend argument list to our queue. | |
| 213 list->remove_end()->set_older(insert_end()); | |
| 214 insert_end()->set_newer(list->remove_end()); | |
| 215 set_insert_end(list->insert_end()); | |
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216 set_length(length() + list_length); |
| 0 | 217 // empty the argument list. |
| 218 } | |
| 219 list->initialize(); | |
| 220 if (TraceGCTaskQueue) { | |
| 221 print("after:"); | |
| 222 list->print("list:"); | |
| 223 } | |
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224 verify_length(); |
| 0 | 225 } |
| 226 | |
| 227 // Dequeue one task. | |
| 228 GCTask* GCTaskQueue::dequeue() { | |
| 229 if (TraceGCTaskQueue) { | |
| 230 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 231 " GCTaskQueue::dequeue()", this); | |
| 232 print("before:"); | |
| 233 } | |
| 234 assert(!is_empty(), "shouldn't dequeue from empty list"); | |
| 235 GCTask* result = remove(); | |
| 236 assert(result != NULL, "shouldn't have NULL task"); | |
| 237 if (TraceGCTaskQueue) { | |
| 238 tty->print_cr(" return: " INTPTR_FORMAT, result); | |
| 239 print("after:"); | |
| 240 } | |
| 241 return result; | |
| 242 } | |
| 243 | |
| 244 // Dequeue one task, preferring one with affinity. | |
| 245 GCTask* GCTaskQueue::dequeue(uint affinity) { | |
| 246 if (TraceGCTaskQueue) { | |
| 247 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 248 " GCTaskQueue::dequeue(%u)", this, affinity); | |
| 249 print("before:"); | |
| 250 } | |
| 251 assert(!is_empty(), "shouldn't dequeue from empty list"); | |
| 252 // Look down to the next barrier for a task with this affinity. | |
| 253 GCTask* result = NULL; | |
| 254 for (GCTask* element = remove_end(); | |
| 255 element != NULL; | |
| 256 element = element->newer()) { | |
| 257 if (element->is_barrier_task()) { | |
| 258 // Don't consider barrier tasks, nor past them. | |
| 259 result = NULL; | |
| 260 break; | |
| 261 } | |
| 262 if (element->affinity() == affinity) { | |
| 263 result = remove(element); | |
| 264 break; | |
| 265 } | |
| 266 } | |
| 267 // If we didn't find anything with affinity, just take the next task. | |
| 268 if (result == NULL) { | |
| 269 result = remove(); | |
| 270 } | |
| 271 if (TraceGCTaskQueue) { | |
| 272 tty->print_cr(" return: " INTPTR_FORMAT, result); | |
| 273 print("after:"); | |
| 274 } | |
| 275 return result; | |
| 276 } | |
| 277 | |
| 278 GCTask* GCTaskQueue::remove() { | |
| 279 // Dequeue from remove end. | |
| 280 GCTask* result = remove_end(); | |
| 281 assert(result != NULL, "shouldn't have null task"); | |
| 282 assert(result->older() == NULL, "not the remove_end"); | |
| 283 set_remove_end(result->newer()); | |
| 284 if (remove_end() == NULL) { | |
| 285 assert(insert_end() == result, "not a singleton"); | |
| 286 set_insert_end(NULL); | |
| 287 } else { | |
| 288 remove_end()->set_older(NULL); | |
| 289 } | |
| 290 result->set_newer(NULL); | |
| 291 decrement_length(); | |
| 292 assert(result->newer() == NULL, "shouldn't be on queue"); | |
| 293 assert(result->older() == NULL, "shouldn't be on queue"); | |
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294 verify_length(); |
| 0 | 295 return result; |
| 296 } | |
| 297 | |
| 298 GCTask* GCTaskQueue::remove(GCTask* task) { | |
| 299 // This is slightly more work, and has slightly fewer asserts | |
| 300 // than removing from the remove end. | |
| 301 assert(task != NULL, "shouldn't have null task"); | |
| 302 GCTask* result = task; | |
| 303 if (result->newer() != NULL) { | |
| 304 result->newer()->set_older(result->older()); | |
| 305 } else { | |
| 306 assert(insert_end() == result, "not youngest"); | |
| 307 set_insert_end(result->older()); | |
| 308 } | |
| 309 if (result->older() != NULL) { | |
| 310 result->older()->set_newer(result->newer()); | |
| 311 } else { | |
| 312 assert(remove_end() == result, "not oldest"); | |
| 313 set_remove_end(result->newer()); | |
| 314 } | |
| 315 result->set_newer(NULL); | |
| 316 result->set_older(NULL); | |
| 317 decrement_length(); | |
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318 verify_length(); |
| 0 | 319 return result; |
| 320 } | |
| 321 | |
| 322 NOT_PRODUCT( | |
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323 // Count the elements in the queue and verify the length against |
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324 // that count. |
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325 void GCTaskQueue::verify_length() const { |
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326 uint count = 0; |
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327 for (GCTask* element = insert_end(); |
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328 element != NULL; |
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329 element = element->older()) { |
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330 |
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331 count++; |
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332 } |
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333 assert(count == length(), "Length does not match queue"); |
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334 } |
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335 |
| 0 | 336 void GCTaskQueue::print(const char* message) const { |
| 337 tty->print_cr("[" INTPTR_FORMAT "] GCTaskQueue:" | |
| 338 " insert_end: " INTPTR_FORMAT | |
| 339 " remove_end: " INTPTR_FORMAT | |
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340 " length: %d" |
| 0 | 341 " %s", |
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342 this, insert_end(), remove_end(), length(), message); |
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343 uint count = 0; |
| 0 | 344 for (GCTask* element = insert_end(); |
| 345 element != NULL; | |
| 346 element = element->older()) { | |
| 347 element->print(" "); | |
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348 count++; |
| 0 | 349 tty->cr(); |
| 350 } | |
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351 tty->print("Total tasks: %d", count); |
| 0 | 352 } |
| 353 ) | |
| 354 | |
| 355 // | |
| 356 // SynchronizedGCTaskQueue | |
| 357 // | |
| 358 | |
| 359 SynchronizedGCTaskQueue::SynchronizedGCTaskQueue(GCTaskQueue* queue_arg, | |
| 360 Monitor * lock_arg) : | |
| 361 _unsynchronized_queue(queue_arg), | |
| 362 _lock(lock_arg) { | |
| 363 assert(unsynchronized_queue() != NULL, "null queue"); | |
| 364 assert(lock() != NULL, "null lock"); | |
| 365 } | |
| 366 | |
| 367 SynchronizedGCTaskQueue::~SynchronizedGCTaskQueue() { | |
| 368 // Nothing to do. | |
| 369 } | |
| 370 | |
| 371 // | |
| 372 // GCTaskManager | |
| 373 // | |
| 374 GCTaskManager::GCTaskManager(uint workers) : | |
| 375 _workers(workers), | |
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376 _active_workers(0), |
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377 _idle_workers(0), |
| 0 | 378 _ndc(NULL) { |
| 379 initialize(); | |
| 380 } | |
| 381 | |
| 382 GCTaskManager::GCTaskManager(uint workers, NotifyDoneClosure* ndc) : | |
| 383 _workers(workers), | |
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384 _active_workers(0), |
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385 _idle_workers(0), |
| 0 | 386 _ndc(ndc) { |
| 387 initialize(); | |
| 388 } | |
| 389 | |
| 390 void GCTaskManager::initialize() { | |
| 391 if (TraceGCTaskManager) { | |
| 392 tty->print_cr("GCTaskManager::initialize: workers: %u", workers()); | |
| 393 } | |
| 394 assert(workers() != 0, "no workers"); | |
| 395 _monitor = new Monitor(Mutex::barrier, // rank | |
| 396 "GCTaskManager monitor", // name | |
| 397 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 398 // The queue for the GCTaskManager must be a CHeapObj. | |
| 399 GCTaskQueue* unsynchronized_queue = GCTaskQueue::create_on_c_heap(); | |
| 400 _queue = SynchronizedGCTaskQueue::create(unsynchronized_queue, lock()); | |
| 401 _noop_task = NoopGCTask::create_on_c_heap(); | |
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402 _idle_inactive_task = WaitForBarrierGCTask::create_on_c_heap(); |
| 0 | 403 _resource_flag = NEW_C_HEAP_ARRAY(bool, workers()); |
| 404 { | |
| 405 // Set up worker threads. | |
| 406 // Distribute the workers among the available processors, | |
| 407 // unless we were told not to, or if the os doesn't want to. | |
| 408 uint* processor_assignment = NEW_C_HEAP_ARRAY(uint, workers()); | |
| 409 if (!BindGCTaskThreadsToCPUs || | |
| 410 !os::distribute_processes(workers(), processor_assignment)) { | |
| 411 for (uint a = 0; a < workers(); a += 1) { | |
| 412 processor_assignment[a] = sentinel_worker(); | |
| 413 } | |
| 414 } | |
| 415 _thread = NEW_C_HEAP_ARRAY(GCTaskThread*, workers()); | |
| 416 for (uint t = 0; t < workers(); t += 1) { | |
| 417 set_thread(t, GCTaskThread::create(this, t, processor_assignment[t])); | |
| 418 } | |
| 419 if (TraceGCTaskThread) { | |
| 420 tty->print("GCTaskManager::initialize: distribution:"); | |
| 421 for (uint t = 0; t < workers(); t += 1) { | |
| 422 tty->print(" %u", processor_assignment[t]); | |
| 423 } | |
| 424 tty->cr(); | |
| 425 } | |
| 426 FREE_C_HEAP_ARRAY(uint, processor_assignment); | |
| 427 } | |
| 428 reset_busy_workers(); | |
| 429 set_unblocked(); | |
| 430 for (uint w = 0; w < workers(); w += 1) { | |
| 431 set_resource_flag(w, false); | |
| 432 } | |
| 433 reset_delivered_tasks(); | |
| 434 reset_completed_tasks(); | |
| 435 reset_noop_tasks(); | |
| 436 reset_barriers(); | |
| 437 reset_emptied_queue(); | |
| 438 for (uint s = 0; s < workers(); s += 1) { | |
| 439 thread(s)->start(); | |
| 440 } | |
| 441 } | |
| 442 | |
| 443 GCTaskManager::~GCTaskManager() { | |
| 444 assert(busy_workers() == 0, "still have busy workers"); | |
| 445 assert(queue()->is_empty(), "still have queued work"); | |
| 446 NoopGCTask::destroy(_noop_task); | |
| 447 _noop_task = NULL; | |
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448 WaitForBarrierGCTask::destroy(_idle_inactive_task); |
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449 _idle_inactive_task = NULL; |
| 0 | 450 if (_thread != NULL) { |
| 451 for (uint i = 0; i < workers(); i += 1) { | |
| 452 GCTaskThread::destroy(thread(i)); | |
| 453 set_thread(i, NULL); | |
| 454 } | |
| 455 FREE_C_HEAP_ARRAY(GCTaskThread*, _thread); | |
| 456 _thread = NULL; | |
| 457 } | |
| 458 if (_resource_flag != NULL) { | |
| 459 FREE_C_HEAP_ARRAY(bool, _resource_flag); | |
| 460 _resource_flag = NULL; | |
| 461 } | |
| 462 if (queue() != NULL) { | |
| 463 GCTaskQueue* unsynchronized_queue = queue()->unsynchronized_queue(); | |
| 464 GCTaskQueue::destroy(unsynchronized_queue); | |
| 465 SynchronizedGCTaskQueue::destroy(queue()); | |
| 466 _queue = NULL; | |
| 467 } | |
| 468 if (monitor() != NULL) { | |
| 469 delete monitor(); | |
| 470 _monitor = NULL; | |
| 471 } | |
| 472 } | |
| 473 | |
|
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474 void GCTaskManager::set_active_gang() { |
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475 _active_workers = |
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476 AdaptiveSizePolicy::calc_active_workers(workers(), |
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477 active_workers(), |
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478 Threads::number_of_non_daemon_threads()); |
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479 |
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480 assert(!all_workers_active() || active_workers() == ParallelGCThreads, |
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481 err_msg("all_workers_active() is incorrect: " |
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482 "active %d ParallelGCThreads %d", active_workers(), |
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483 ParallelGCThreads)); |
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484 if (TraceDynamicGCThreads) { |
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485 gclog_or_tty->print_cr("GCTaskManager::set_active_gang(): " |
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486 "all_workers_active() %d workers %d " |
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487 "active %d ParallelGCThreads %d ", |
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488 all_workers_active(), workers(), active_workers(), |
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489 ParallelGCThreads); |
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490 } |
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491 } |
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492 |
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493 // Create IdleGCTasks for inactive workers. |
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494 // Creates tasks in a ResourceArea and assumes |
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495 // an appropriate ResourceMark. |
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496 void GCTaskManager::task_idle_workers() { |
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497 { |
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498 int more_inactive_workers = 0; |
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499 { |
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500 // Stop any idle tasks from exiting their IdleGCTask's |
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501 // and get the count for additional IdleGCTask's under |
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502 // the GCTaskManager's monitor so that the "more_inactive_workers" |
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503 // count is correct. |
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504 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
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505 _idle_inactive_task->set_should_wait(true); |
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506 // active_workers are a number being requested. idle_workers |
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507 // are the number currently idle. If all the workers are being |
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508 // requested to be active but some are already idle, reduce |
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509 // the number of active_workers to be consistent with the |
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510 // number of idle_workers. The idle_workers are stuck in |
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511 // idle tasks and will no longer be release (since a new GC |
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512 // is starting). Try later to release enough idle_workers |
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513 // to allow the desired number of active_workers. |
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514 more_inactive_workers = |
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515 workers() - active_workers() - idle_workers(); |
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516 if (more_inactive_workers < 0) { |
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517 int reduced_active_workers = active_workers() + more_inactive_workers; |
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518 set_active_workers(reduced_active_workers); |
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519 more_inactive_workers = 0; |
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520 } |
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521 if (TraceDynamicGCThreads) { |
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522 gclog_or_tty->print_cr("JT: %d workers %d active %d " |
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523 "idle %d more %d", |
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524 Threads::number_of_non_daemon_threads(), |
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525 workers(), |
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526 active_workers(), |
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527 idle_workers(), |
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528 more_inactive_workers); |
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529 } |
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530 } |
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531 GCTaskQueue* q = GCTaskQueue::create(); |
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532 for(uint i = 0; i < (uint) more_inactive_workers; i++) { |
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533 q->enqueue(IdleGCTask::create_on_c_heap()); |
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534 increment_idle_workers(); |
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535 } |
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536 assert(workers() == active_workers() + idle_workers(), |
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537 "total workers should equal active + inactive"); |
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538 add_list(q); |
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539 // GCTaskQueue* q was created in a ResourceArea so a |
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540 // destroy() call is not needed. |
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541 } |
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542 } |
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543 |
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544 void GCTaskManager::release_idle_workers() { |
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545 { |
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546 MutexLockerEx ml(monitor(), |
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547 Mutex::_no_safepoint_check_flag); |
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548 _idle_inactive_task->set_should_wait(false); |
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549 monitor()->notify_all(); |
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550 // Release monitor |
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551 } |
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552 } |
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553 |
| 0 | 554 void GCTaskManager::print_task_time_stamps() { |
| 555 for(uint i=0; i<ParallelGCThreads; i++) { | |
| 556 GCTaskThread* t = thread(i); | |
| 557 t->print_task_time_stamps(); | |
| 558 } | |
| 559 } | |
| 560 | |
| 561 void GCTaskManager::print_threads_on(outputStream* st) { | |
| 562 uint num_thr = workers(); | |
| 563 for (uint i = 0; i < num_thr; i++) { | |
| 564 thread(i)->print_on(st); | |
| 565 st->cr(); | |
| 566 } | |
| 567 } | |
| 568 | |
| 569 void GCTaskManager::threads_do(ThreadClosure* tc) { | |
| 570 assert(tc != NULL, "Null ThreadClosure"); | |
| 571 uint num_thr = workers(); | |
| 572 for (uint i = 0; i < num_thr; i++) { | |
| 573 tc->do_thread(thread(i)); | |
| 574 } | |
| 575 } | |
| 576 | |
| 577 GCTaskThread* GCTaskManager::thread(uint which) { | |
| 578 assert(which < workers(), "index out of bounds"); | |
| 579 assert(_thread[which] != NULL, "shouldn't have null thread"); | |
| 580 return _thread[which]; | |
| 581 } | |
| 582 | |
| 583 void GCTaskManager::set_thread(uint which, GCTaskThread* value) { | |
| 584 assert(which < workers(), "index out of bounds"); | |
| 585 assert(value != NULL, "shouldn't have null thread"); | |
| 586 _thread[which] = value; | |
| 587 } | |
| 588 | |
| 589 void GCTaskManager::add_task(GCTask* task) { | |
| 590 assert(task != NULL, "shouldn't have null task"); | |
| 591 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 592 if (TraceGCTaskManager) { | |
| 593 tty->print_cr("GCTaskManager::add_task(" INTPTR_FORMAT " [%s])", | |
| 594 task, GCTask::Kind::to_string(task->kind())); | |
| 595 } | |
| 596 queue()->enqueue(task); | |
| 597 // Notify with the lock held to avoid missed notifies. | |
| 598 if (TraceGCTaskManager) { | |
| 599 tty->print_cr(" GCTaskManager::add_task (%s)->notify_all", | |
| 600 monitor()->name()); | |
| 601 } | |
| 602 (void) monitor()->notify_all(); | |
| 603 // Release monitor(). | |
| 604 } | |
| 605 | |
| 606 void GCTaskManager::add_list(GCTaskQueue* list) { | |
| 607 assert(list != NULL, "shouldn't have null task"); | |
| 608 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 609 if (TraceGCTaskManager) { | |
| 610 tty->print_cr("GCTaskManager::add_list(%u)", list->length()); | |
| 611 } | |
| 612 queue()->enqueue(list); | |
| 613 // Notify with the lock held to avoid missed notifies. | |
| 614 if (TraceGCTaskManager) { | |
| 615 tty->print_cr(" GCTaskManager::add_list (%s)->notify_all", | |
| 616 monitor()->name()); | |
| 617 } | |
| 618 (void) monitor()->notify_all(); | |
| 619 // Release monitor(). | |
| 620 } | |
| 621 | |
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622 // GC workers wait in get_task() for new work to be added |
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623 // to the GCTaskManager's queue. When new work is added, |
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624 // a notify is sent to the waiting GC workers which then |
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625 // compete to get tasks. If a GC worker wakes up and there |
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626 // is no work on the queue, it is given a noop_task to execute |
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627 // and then loops to find more work. |
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628 |
| 0 | 629 GCTask* GCTaskManager::get_task(uint which) { |
| 630 GCTask* result = NULL; | |
| 631 // Grab the queue lock. | |
| 632 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 633 // Wait while the queue is block or | |
| 634 // there is nothing to do, except maybe release resources. | |
| 635 while (is_blocked() || | |
| 636 (queue()->is_empty() && !should_release_resources(which))) { | |
| 637 if (TraceGCTaskManager) { | |
| 638 tty->print_cr("GCTaskManager::get_task(%u)" | |
| 639 " blocked: %s" | |
| 640 " empty: %s" | |
| 641 " release: %s", | |
| 642 which, | |
| 643 is_blocked() ? "true" : "false", | |
| 644 queue()->is_empty() ? "true" : "false", | |
| 645 should_release_resources(which) ? "true" : "false"); | |
| 646 tty->print_cr(" => (%s)->wait()", | |
| 647 monitor()->name()); | |
| 648 } | |
| 649 monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 650 } | |
| 651 // We've reacquired the queue lock here. | |
| 652 // Figure out which condition caused us to exit the loop above. | |
| 653 if (!queue()->is_empty()) { | |
| 654 if (UseGCTaskAffinity) { | |
| 655 result = queue()->dequeue(which); | |
| 656 } else { | |
| 657 result = queue()->dequeue(); | |
| 658 } | |
| 659 if (result->is_barrier_task()) { | |
| 660 assert(which != sentinel_worker(), | |
| 661 "blocker shouldn't be bogus"); | |
| 662 set_blocking_worker(which); | |
| 663 } | |
| 664 } else { | |
| 665 // The queue is empty, but we were woken up. | |
| 666 // Just hand back a Noop task, | |
| 667 // in case someone wanted us to release resources, or whatever. | |
| 668 result = noop_task(); | |
| 669 increment_noop_tasks(); | |
| 670 } | |
| 671 assert(result != NULL, "shouldn't have null task"); | |
| 672 if (TraceGCTaskManager) { | |
| 673 tty->print_cr("GCTaskManager::get_task(%u) => " INTPTR_FORMAT " [%s]", | |
| 674 which, result, GCTask::Kind::to_string(result->kind())); | |
| 675 tty->print_cr(" %s", result->name()); | |
| 676 } | |
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677 if (!result->is_idle_task()) { |
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678 increment_busy_workers(); |
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679 increment_delivered_tasks(); |
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680 } |
| 0 | 681 return result; |
| 682 // Release monitor(). | |
| 683 } | |
| 684 | |
| 685 void GCTaskManager::note_completion(uint which) { | |
| 686 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 687 if (TraceGCTaskManager) { | |
| 688 tty->print_cr("GCTaskManager::note_completion(%u)", which); | |
| 689 } | |
| 690 // If we are blocked, check if the completing thread is the blocker. | |
| 691 if (blocking_worker() == which) { | |
| 692 assert(blocking_worker() != sentinel_worker(), | |
| 693 "blocker shouldn't be bogus"); | |
| 694 increment_barriers(); | |
| 695 set_unblocked(); | |
| 696 } | |
| 697 increment_completed_tasks(); | |
| 698 uint active = decrement_busy_workers(); | |
| 699 if ((active == 0) && (queue()->is_empty())) { | |
| 700 increment_emptied_queue(); | |
| 701 if (TraceGCTaskManager) { | |
| 702 tty->print_cr(" GCTaskManager::note_completion(%u) done", which); | |
| 703 } | |
| 704 // Notify client that we are done. | |
| 705 NotifyDoneClosure* ndc = notify_done_closure(); | |
| 706 if (ndc != NULL) { | |
| 707 ndc->notify(this); | |
| 708 } | |
| 709 } | |
| 710 if (TraceGCTaskManager) { | |
| 711 tty->print_cr(" GCTaskManager::note_completion(%u) (%s)->notify_all", | |
| 712 which, monitor()->name()); | |
| 713 tty->print_cr(" " | |
| 714 " blocked: %s" | |
| 715 " empty: %s" | |
| 716 " release: %s", | |
| 717 is_blocked() ? "true" : "false", | |
| 718 queue()->is_empty() ? "true" : "false", | |
| 719 should_release_resources(which) ? "true" : "false"); | |
| 720 tty->print_cr(" " | |
| 721 " delivered: %u" | |
| 722 " completed: %u" | |
| 723 " barriers: %u" | |
| 724 " emptied: %u", | |
| 725 delivered_tasks(), | |
| 726 completed_tasks(), | |
| 727 barriers(), | |
| 728 emptied_queue()); | |
| 729 } | |
| 730 // Tell everyone that a task has completed. | |
| 731 (void) monitor()->notify_all(); | |
| 732 // Release monitor(). | |
| 733 } | |
| 734 | |
| 735 uint GCTaskManager::increment_busy_workers() { | |
| 736 assert(queue()->own_lock(), "don't own the lock"); | |
| 737 _busy_workers += 1; | |
| 738 return _busy_workers; | |
| 739 } | |
| 740 | |
| 741 uint GCTaskManager::decrement_busy_workers() { | |
| 742 assert(queue()->own_lock(), "don't own the lock"); | |
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743 assert(_busy_workers > 0, "About to make a mistake"); |
| 0 | 744 _busy_workers -= 1; |
| 745 return _busy_workers; | |
| 746 } | |
| 747 | |
| 748 void GCTaskManager::release_all_resources() { | |
| 749 // If you want this to be done atomically, do it in a BarrierGCTask. | |
| 750 for (uint i = 0; i < workers(); i += 1) { | |
| 751 set_resource_flag(i, true); | |
| 752 } | |
| 753 } | |
| 754 | |
| 755 bool GCTaskManager::should_release_resources(uint which) { | |
| 756 // This can be done without a lock because each thread reads one element. | |
| 757 return resource_flag(which); | |
| 758 } | |
| 759 | |
| 760 void GCTaskManager::note_release(uint which) { | |
| 761 // This can be done without a lock because each thread writes one element. | |
| 762 set_resource_flag(which, false); | |
| 763 } | |
| 764 | |
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765 // "list" contains tasks that are ready to execute. Those |
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766 // tasks are added to the GCTaskManager's queue of tasks and |
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767 // then the GC workers are notified that there is new work to |
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768 // do. |
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769 // |
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770 // Typically different types of tasks can be added to the "list". |
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771 // For example in PSScavenge OldToYoungRootsTask, SerialOldToYoungRootsTask, |
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772 // ScavengeRootsTask, and StealTask tasks are all added to the list |
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773 // and then the GC workers are notified of new work. The tasks are |
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774 // handed out in the order in which they are added to the list |
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775 // (although execution is not necessarily in that order). As long |
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776 // as any tasks are running the GCTaskManager will wait for execution |
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777 // to complete. GC workers that execute a stealing task remain in |
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778 // the stealing task until all stealing tasks have completed. The load |
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779 // balancing afforded by the stealing tasks work best if the stealing |
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780 // tasks are added last to the list. |
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781 |
| 0 | 782 void GCTaskManager::execute_and_wait(GCTaskQueue* list) { |
| 783 WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); | |
| 784 list->enqueue(fin); | |
| 785 add_list(list); | |
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786 fin->wait_for(true /* reset */); |
| 0 | 787 // We have to release the barrier tasks! |
| 788 WaitForBarrierGCTask::destroy(fin); | |
| 789 } | |
| 790 | |
| 791 bool GCTaskManager::resource_flag(uint which) { | |
| 792 assert(which < workers(), "index out of bounds"); | |
| 793 return _resource_flag[which]; | |
| 794 } | |
| 795 | |
| 796 void GCTaskManager::set_resource_flag(uint which, bool value) { | |
| 797 assert(which < workers(), "index out of bounds"); | |
| 798 _resource_flag[which] = value; | |
| 799 } | |
| 800 | |
| 801 // | |
| 802 // NoopGCTask | |
| 803 // | |
| 804 | |
| 805 NoopGCTask* NoopGCTask::create() { | |
| 806 NoopGCTask* result = new NoopGCTask(false); | |
| 807 return result; | |
| 808 } | |
| 809 | |
| 810 NoopGCTask* NoopGCTask::create_on_c_heap() { | |
| 811 NoopGCTask* result = new(ResourceObj::C_HEAP) NoopGCTask(true); | |
| 812 return result; | |
| 813 } | |
| 814 | |
| 815 void NoopGCTask::destroy(NoopGCTask* that) { | |
| 816 if (that != NULL) { | |
| 817 that->destruct(); | |
| 818 if (that->is_c_heap_obj()) { | |
| 819 FreeHeap(that); | |
| 820 } | |
| 821 } | |
| 822 } | |
| 823 | |
| 824 void NoopGCTask::destruct() { | |
| 825 // This has to know it's superclass structure, just like the constructor. | |
| 826 this->GCTask::destruct(); | |
| 827 // Nothing else to do. | |
| 828 } | |
| 829 | |
| 830 // | |
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831 // IdleGCTask |
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832 // |
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833 |
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834 IdleGCTask* IdleGCTask::create() { |
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835 IdleGCTask* result = new IdleGCTask(false); |
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836 return result; |
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837 } |
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838 |
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839 IdleGCTask* IdleGCTask::create_on_c_heap() { |
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840 IdleGCTask* result = new(ResourceObj::C_HEAP) IdleGCTask(true); |
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841 return result; |
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842 } |
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843 |
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844 void IdleGCTask::do_it(GCTaskManager* manager, uint which) { |
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845 WaitForBarrierGCTask* wait_for_task = manager->idle_inactive_task(); |
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846 if (TraceGCTaskManager) { |
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847 tty->print_cr("[" INTPTR_FORMAT "]" |
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848 " IdleGCTask:::do_it()" |
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849 " should_wait: %s", |
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850 this, wait_for_task->should_wait() ? "true" : "false"); |
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851 } |
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852 MutexLockerEx ml(manager->monitor(), Mutex::_no_safepoint_check_flag); |
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853 if (TraceDynamicGCThreads) { |
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854 gclog_or_tty->print_cr("--- idle %d", which); |
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855 } |
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856 // Increment has to be done when the idle tasks are created. |
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857 // manager->increment_idle_workers(); |
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858 manager->monitor()->notify_all(); |
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859 while (wait_for_task->should_wait()) { |
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860 if (TraceGCTaskManager) { |
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861 tty->print_cr("[" INTPTR_FORMAT "]" |
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862 " IdleGCTask::do_it()" |
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863 " [" INTPTR_FORMAT "] (%s)->wait()", |
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864 this, manager->monitor(), manager->monitor()->name()); |
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865 } |
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866 manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
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867 } |
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868 manager->decrement_idle_workers(); |
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869 if (TraceDynamicGCThreads) { |
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870 gclog_or_tty->print_cr("--- release %d", which); |
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871 } |
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872 if (TraceGCTaskManager) { |
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873 tty->print_cr("[" INTPTR_FORMAT "]" |
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874 " IdleGCTask::do_it() returns" |
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875 " should_wait: %s", |
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876 this, wait_for_task->should_wait() ? "true" : "false"); |
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877 } |
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878 // Release monitor(). |
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879 } |
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880 |
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881 void IdleGCTask::destroy(IdleGCTask* that) { |
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882 if (that != NULL) { |
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883 that->destruct(); |
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884 if (that->is_c_heap_obj()) { |
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885 FreeHeap(that); |
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886 } |
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887 } |
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888 } |
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889 |
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890 void IdleGCTask::destruct() { |
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891 // This has to know it's superclass structure, just like the constructor. |
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892 this->GCTask::destruct(); |
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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1972
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893 // Nothing else to do. |
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bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
1972
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894 } |
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bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
1972
diff
changeset
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895 |
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bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
1972
diff
changeset
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896 // |
| 0 | 897 // BarrierGCTask |
| 898 // | |
| 899 | |
| 900 void BarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 901 // Wait for this to be the only busy worker. | |
| 902 // ??? I thought of having a StackObj class | |
| 903 // whose constructor would grab the lock and come to the barrier, | |
| 904 // and whose destructor would release the lock, | |
| 905 // but that seems like too much mechanism for two lines of code. | |
| 906 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 907 do_it_internal(manager, which); | |
| 908 // Release manager->lock(). | |
| 909 } | |
| 910 | |
| 911 void BarrierGCTask::do_it_internal(GCTaskManager* manager, uint which) { | |
| 912 // Wait for this to be the only busy worker. | |
| 913 assert(manager->monitor()->owned_by_self(), "don't own the lock"); | |
| 914 assert(manager->is_blocked(), "manager isn't blocked"); | |
| 915 while (manager->busy_workers() > 1) { | |
| 916 if (TraceGCTaskManager) { | |
| 917 tty->print_cr("BarrierGCTask::do_it(%u) waiting on %u workers", | |
| 918 which, manager->busy_workers()); | |
| 919 } | |
| 920 manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 921 } | |
| 922 } | |
| 923 | |
| 924 void BarrierGCTask::destruct() { | |
| 925 this->GCTask::destruct(); | |
| 926 // Nothing else to do. | |
| 927 } | |
| 928 | |
| 929 // | |
| 930 // ReleasingBarrierGCTask | |
| 931 // | |
| 932 | |
| 933 void ReleasingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 934 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 935 do_it_internal(manager, which); | |
| 936 manager->release_all_resources(); | |
| 937 // Release manager->lock(). | |
| 938 } | |
| 939 | |
| 940 void ReleasingBarrierGCTask::destruct() { | |
| 941 this->BarrierGCTask::destruct(); | |
| 942 // Nothing else to do. | |
| 943 } | |
| 944 | |
| 945 // | |
| 946 // NotifyingBarrierGCTask | |
| 947 // | |
| 948 | |
| 949 void NotifyingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 950 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 951 do_it_internal(manager, which); | |
| 952 NotifyDoneClosure* ndc = notify_done_closure(); | |
| 953 if (ndc != NULL) { | |
| 954 ndc->notify(manager); | |
| 955 } | |
| 956 // Release manager->lock(). | |
| 957 } | |
| 958 | |
| 959 void NotifyingBarrierGCTask::destruct() { | |
| 960 this->BarrierGCTask::destruct(); | |
| 961 // Nothing else to do. | |
| 962 } | |
| 963 | |
| 964 // | |
| 965 // WaitForBarrierGCTask | |
| 966 // | |
| 967 WaitForBarrierGCTask* WaitForBarrierGCTask::create() { | |
| 968 WaitForBarrierGCTask* result = new WaitForBarrierGCTask(false); | |
| 969 return result; | |
| 970 } | |
| 971 | |
| 972 WaitForBarrierGCTask* WaitForBarrierGCTask::create_on_c_heap() { | |
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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973 WaitForBarrierGCTask* result = |
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bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
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974 new (ResourceObj::C_HEAP) WaitForBarrierGCTask(true); |
| 0 | 975 return result; |
| 976 } | |
| 977 | |
| 978 WaitForBarrierGCTask::WaitForBarrierGCTask(bool on_c_heap) : | |
| 979 _is_c_heap_obj(on_c_heap) { | |
| 980 _monitor = MonitorSupply::reserve(); | |
| 981 set_should_wait(true); | |
| 982 if (TraceGCTaskManager) { | |
| 983 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 984 " WaitForBarrierGCTask::WaitForBarrierGCTask()" | |
| 985 " monitor: " INTPTR_FORMAT, | |
| 986 this, monitor()); | |
| 987 } | |
| 988 } | |
| 989 | |
| 990 void WaitForBarrierGCTask::destroy(WaitForBarrierGCTask* that) { | |
| 991 if (that != NULL) { | |
| 992 if (TraceGCTaskManager) { | |
| 993 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 994 " WaitForBarrierGCTask::destroy()" | |
| 995 " is_c_heap_obj: %s" | |
| 996 " monitor: " INTPTR_FORMAT, | |
| 997 that, | |
| 998 that->is_c_heap_obj() ? "true" : "false", | |
| 999 that->monitor()); | |
| 1000 } | |
| 1001 that->destruct(); | |
| 1002 if (that->is_c_heap_obj()) { | |
| 1003 FreeHeap(that); | |
| 1004 } | |
| 1005 } | |
| 1006 } | |
| 1007 | |
| 1008 void WaitForBarrierGCTask::destruct() { | |
| 1009 assert(monitor() != NULL, "monitor should not be NULL"); | |
| 1010 if (TraceGCTaskManager) { | |
| 1011 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1012 " WaitForBarrierGCTask::destruct()" | |
| 1013 " monitor: " INTPTR_FORMAT, | |
| 1014 this, monitor()); | |
| 1015 } | |
| 1016 this->BarrierGCTask::destruct(); | |
| 1017 // Clean up that should be in the destructor, | |
| 1018 // except that ResourceMarks don't call destructors. | |
| 1019 if (monitor() != NULL) { | |
| 1020 MonitorSupply::release(monitor()); | |
| 1021 } | |
| 1022 _monitor = (Monitor*) 0xDEAD000F; | |
| 1023 } | |
| 1024 | |
| 1025 void WaitForBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 1026 if (TraceGCTaskManager) { | |
| 1027 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1028 " WaitForBarrierGCTask::do_it() waiting for idle" | |
| 1029 " monitor: " INTPTR_FORMAT, | |
| 1030 this, monitor()); | |
| 1031 } | |
| 1032 { | |
| 1033 // First, wait for the barrier to arrive. | |
| 1034 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 1035 do_it_internal(manager, which); | |
| 1036 // Release manager->lock(). | |
| 1037 } | |
| 1038 { | |
| 1039 // Then notify the waiter. | |
| 1040 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 1041 set_should_wait(false); | |
| 1042 // Waiter doesn't miss the notify in the wait_for method | |
| 1043 // since it checks the flag after grabbing the monitor. | |
| 1044 if (TraceGCTaskManager) { | |
| 1045 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1046 " WaitForBarrierGCTask::do_it()" | |
| 1047 " [" INTPTR_FORMAT "] (%s)->notify_all()", | |
| 1048 this, monitor(), monitor()->name()); | |
| 1049 } | |
| 1050 monitor()->notify_all(); | |
| 1051 // Release monitor(). | |
| 1052 } | |
| 1053 } | |
| 1054 | |
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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1972
diff
changeset
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1055 void WaitForBarrierGCTask::wait_for(bool reset) { |
| 0 | 1056 if (TraceGCTaskManager) { |
| 1057 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1058 " WaitForBarrierGCTask::wait_for()" | |
| 1059 " should_wait: %s", | |
| 1060 this, should_wait() ? "true" : "false"); | |
| 1061 } | |
| 1062 { | |
| 1063 // Grab the lock and check again. | |
| 1064 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 1065 while (should_wait()) { | |
| 1066 if (TraceGCTaskManager) { | |
| 1067 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1068 " WaitForBarrierGCTask::wait_for()" | |
| 1069 " [" INTPTR_FORMAT "] (%s)->wait()", | |
| 1070 this, monitor(), monitor()->name()); | |
| 1071 } | |
| 1072 monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 1073 } | |
| 1074 // Reset the flag in case someone reuses this task. | |
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bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
1972
diff
changeset
|
1075 if (reset) { |
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bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
1972
diff
changeset
|
1076 set_should_wait(true); |
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bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
1972
diff
changeset
|
1077 } |
| 0 | 1078 if (TraceGCTaskManager) { |
| 1079 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1080 " WaitForBarrierGCTask::wait_for() returns" | |
| 1081 " should_wait: %s", | |
| 1082 this, should_wait() ? "true" : "false"); | |
| 1083 } | |
| 1084 // Release monitor(). | |
| 1085 } | |
| 1086 } | |
| 1087 | |
| 1088 Mutex* MonitorSupply::_lock = NULL; | |
| 1089 GrowableArray<Monitor*>* MonitorSupply::_freelist = NULL; | |
| 1090 | |
| 1091 Monitor* MonitorSupply::reserve() { | |
| 1092 Monitor* result = NULL; | |
| 1093 // Lazy initialization: possible race. | |
| 1094 if (lock() == NULL) { | |
| 1095 _lock = new Mutex(Mutex::barrier, // rank | |
| 1096 "MonitorSupply mutex", // name | |
| 1097 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 1098 } | |
| 1099 { | |
| 1100 MutexLockerEx ml(lock()); | |
| 1101 // Lazy initialization. | |
| 1102 if (freelist() == NULL) { | |
| 1103 _freelist = | |
| 1104 new(ResourceObj::C_HEAP) GrowableArray<Monitor*>(ParallelGCThreads, | |
| 1105 true); | |
| 1106 } | |
| 1107 if (! freelist()->is_empty()) { | |
| 1108 result = freelist()->pop(); | |
| 1109 } else { | |
| 1110 result = new Monitor(Mutex::barrier, // rank | |
| 1111 "MonitorSupply monitor", // name | |
| 1112 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 1113 } | |
| 1114 guarantee(result != NULL, "shouldn't return NULL"); | |
| 1115 assert(!result->is_locked(), "shouldn't be locked"); | |
| 1116 // release lock(). | |
| 1117 } | |
| 1118 return result; | |
| 1119 } | |
| 1120 | |
| 1121 void MonitorSupply::release(Monitor* instance) { | |
| 1122 assert(instance != NULL, "shouldn't release NULL"); | |
| 1123 assert(!instance->is_locked(), "shouldn't be locked"); | |
| 1124 { | |
| 1125 MutexLockerEx ml(lock()); | |
| 1126 freelist()->push(instance); | |
| 1127 // release lock(). | |
| 1128 } | |
| 1129 } |