Fri, 29 Apr 2016 00:06:10 +0800
Added MIPS 64-bit port.
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@1 | 25 | /* |
aoqi@1 | 26 | * This file has been modified by Loongson Technology in 2015. These |
aoqi@1 | 27 | * modifications are Copyright (c) 2015 Loongson Technology, and are made |
aoqi@1 | 28 | * available on the same license terms set forth above. |
aoqi@1 | 29 | */ |
aoqi@1 | 30 | |
aoqi@0 | 31 | #include "precompiled.hpp" |
aoqi@0 | 32 | #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" |
aoqi@0 | 33 | #include "gc_implementation/parallelScavenge/gcTaskThread.hpp" |
aoqi@0 | 34 | #include "gc_implementation/shared/adaptiveSizePolicy.hpp" |
aoqi@0 | 35 | #include "memory/allocation.hpp" |
aoqi@0 | 36 | #include "memory/allocation.inline.hpp" |
aoqi@0 | 37 | #include "runtime/mutex.hpp" |
aoqi@0 | 38 | #include "runtime/mutexLocker.hpp" |
aoqi@0 | 39 | |
aoqi@0 | 40 | PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
aoqi@0 | 41 | |
aoqi@0 | 42 | // |
aoqi@0 | 43 | // GCTask |
aoqi@0 | 44 | // |
aoqi@0 | 45 | |
aoqi@0 | 46 | const char* GCTask::Kind::to_string(kind value) { |
aoqi@0 | 47 | const char* result = "unknown GCTask kind"; |
aoqi@0 | 48 | switch (value) { |
aoqi@0 | 49 | default: |
aoqi@0 | 50 | result = "unknown GCTask kind"; |
aoqi@0 | 51 | break; |
aoqi@0 | 52 | case unknown_task: |
aoqi@0 | 53 | result = "unknown task"; |
aoqi@0 | 54 | break; |
aoqi@0 | 55 | case ordinary_task: |
aoqi@0 | 56 | result = "ordinary task"; |
aoqi@0 | 57 | break; |
aoqi@0 | 58 | case barrier_task: |
aoqi@0 | 59 | result = "barrier task"; |
aoqi@0 | 60 | break; |
aoqi@0 | 61 | case noop_task: |
aoqi@0 | 62 | result = "noop task"; |
aoqi@0 | 63 | break; |
aoqi@0 | 64 | case idle_task: |
aoqi@0 | 65 | result = "idle task"; |
aoqi@0 | 66 | break; |
aoqi@0 | 67 | } |
aoqi@0 | 68 | return result; |
aoqi@0 | 69 | }; |
aoqi@0 | 70 | |
aoqi@0 | 71 | GCTask::GCTask() : |
aoqi@0 | 72 | _kind(Kind::ordinary_task), |
aoqi@0 | 73 | _affinity(GCTaskManager::sentinel_worker()){ |
aoqi@0 | 74 | initialize(); |
aoqi@0 | 75 | } |
aoqi@0 | 76 | |
aoqi@0 | 77 | GCTask::GCTask(Kind::kind kind) : |
aoqi@0 | 78 | _kind(kind), |
aoqi@0 | 79 | _affinity(GCTaskManager::sentinel_worker()) { |
aoqi@0 | 80 | initialize(); |
aoqi@0 | 81 | } |
aoqi@0 | 82 | |
aoqi@0 | 83 | GCTask::GCTask(uint affinity) : |
aoqi@0 | 84 | _kind(Kind::ordinary_task), |
aoqi@0 | 85 | _affinity(affinity) { |
aoqi@0 | 86 | initialize(); |
aoqi@0 | 87 | } |
aoqi@0 | 88 | |
aoqi@0 | 89 | GCTask::GCTask(Kind::kind kind, uint affinity) : |
aoqi@0 | 90 | _kind(kind), |
aoqi@0 | 91 | _affinity(affinity) { |
aoqi@0 | 92 | initialize(); |
aoqi@0 | 93 | } |
aoqi@0 | 94 | |
aoqi@0 | 95 | void GCTask::initialize() { |
aoqi@0 | 96 | _older = NULL; |
aoqi@0 | 97 | _newer = NULL; |
aoqi@0 | 98 | } |
aoqi@0 | 99 | |
aoqi@0 | 100 | void GCTask::destruct() { |
aoqi@0 | 101 | assert(older() == NULL, "shouldn't have an older task"); |
aoqi@0 | 102 | assert(newer() == NULL, "shouldn't have a newer task"); |
aoqi@0 | 103 | // Nothing to do. |
aoqi@0 | 104 | } |
aoqi@0 | 105 | |
aoqi@0 | 106 | NOT_PRODUCT( |
aoqi@0 | 107 | void GCTask::print(const char* message) const { |
aoqi@0 | 108 | tty->print(INTPTR_FORMAT " <- " INTPTR_FORMAT "(%u) -> " INTPTR_FORMAT, |
aoqi@0 | 109 | newer(), this, affinity(), older()); |
aoqi@0 | 110 | } |
aoqi@0 | 111 | ) |
aoqi@0 | 112 | |
aoqi@0 | 113 | // |
aoqi@0 | 114 | // GCTaskQueue |
aoqi@0 | 115 | // |
aoqi@0 | 116 | |
aoqi@0 | 117 | GCTaskQueue* GCTaskQueue::create() { |
aoqi@0 | 118 | GCTaskQueue* result = new GCTaskQueue(false); |
aoqi@0 | 119 | if (TraceGCTaskQueue) { |
aoqi@0 | 120 | tty->print_cr("GCTaskQueue::create()" |
aoqi@0 | 121 | " returns " INTPTR_FORMAT, result); |
aoqi@0 | 122 | } |
aoqi@0 | 123 | return result; |
aoqi@0 | 124 | } |
aoqi@0 | 125 | |
aoqi@0 | 126 | GCTaskQueue* GCTaskQueue::create_on_c_heap() { |
aoqi@0 | 127 | GCTaskQueue* result = new(ResourceObj::C_HEAP, mtGC) GCTaskQueue(true); |
aoqi@0 | 128 | if (TraceGCTaskQueue) { |
aoqi@0 | 129 | tty->print_cr("GCTaskQueue::create_on_c_heap()" |
aoqi@0 | 130 | " returns " INTPTR_FORMAT, |
aoqi@0 | 131 | result); |
aoqi@0 | 132 | } |
aoqi@0 | 133 | return result; |
aoqi@0 | 134 | } |
aoqi@0 | 135 | |
aoqi@0 | 136 | GCTaskQueue::GCTaskQueue(bool on_c_heap) : |
aoqi@0 | 137 | _is_c_heap_obj(on_c_heap) { |
aoqi@0 | 138 | initialize(); |
aoqi@0 | 139 | if (TraceGCTaskQueue) { |
aoqi@0 | 140 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 141 | " GCTaskQueue::GCTaskQueue() constructor", |
aoqi@0 | 142 | this); |
aoqi@0 | 143 | } |
aoqi@0 | 144 | } |
aoqi@0 | 145 | |
aoqi@0 | 146 | void GCTaskQueue::destruct() { |
aoqi@0 | 147 | // Nothing to do. |
aoqi@0 | 148 | } |
aoqi@0 | 149 | |
aoqi@0 | 150 | void GCTaskQueue::destroy(GCTaskQueue* that) { |
aoqi@0 | 151 | if (TraceGCTaskQueue) { |
aoqi@0 | 152 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 153 | " GCTaskQueue::destroy()" |
aoqi@0 | 154 | " is_c_heap_obj: %s", |
aoqi@0 | 155 | that, |
aoqi@0 | 156 | that->is_c_heap_obj() ? "true" : "false"); |
aoqi@0 | 157 | } |
aoqi@0 | 158 | // That instance may have been allocated as a CHeapObj, |
aoqi@0 | 159 | // in which case we have to free it explicitly. |
aoqi@0 | 160 | if (that != NULL) { |
aoqi@0 | 161 | that->destruct(); |
aoqi@0 | 162 | assert(that->is_empty(), "should be empty"); |
aoqi@0 | 163 | if (that->is_c_heap_obj()) { |
aoqi@0 | 164 | FreeHeap(that); |
aoqi@0 | 165 | } |
aoqi@0 | 166 | } |
aoqi@0 | 167 | } |
aoqi@0 | 168 | |
aoqi@0 | 169 | void GCTaskQueue::initialize() { |
aoqi@0 | 170 | set_insert_end(NULL); |
aoqi@0 | 171 | set_remove_end(NULL); |
aoqi@0 | 172 | set_length(0); |
aoqi@0 | 173 | } |
aoqi@0 | 174 | |
aoqi@0 | 175 | // Enqueue one task. |
aoqi@0 | 176 | void GCTaskQueue::enqueue(GCTask* task) { |
aoqi@0 | 177 | if (TraceGCTaskQueue) { |
aoqi@0 | 178 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 179 | " GCTaskQueue::enqueue(task: " |
aoqi@0 | 180 | INTPTR_FORMAT ")", |
aoqi@0 | 181 | this, task); |
aoqi@0 | 182 | print("before:"); |
aoqi@0 | 183 | } |
aoqi@0 | 184 | assert(task != NULL, "shouldn't have null task"); |
aoqi@0 | 185 | assert(task->older() == NULL, "shouldn't be on queue"); |
aoqi@0 | 186 | assert(task->newer() == NULL, "shouldn't be on queue"); |
aoqi@0 | 187 | task->set_newer(NULL); |
aoqi@0 | 188 | task->set_older(insert_end()); |
aoqi@0 | 189 | if (is_empty()) { |
aoqi@0 | 190 | set_remove_end(task); |
aoqi@0 | 191 | } else { |
aoqi@0 | 192 | insert_end()->set_newer(task); |
aoqi@0 | 193 | } |
aoqi@0 | 194 | set_insert_end(task); |
aoqi@0 | 195 | increment_length(); |
aoqi@0 | 196 | verify_length(); |
aoqi@0 | 197 | if (TraceGCTaskQueue) { |
aoqi@0 | 198 | print("after:"); |
aoqi@0 | 199 | } |
aoqi@0 | 200 | } |
aoqi@0 | 201 | |
aoqi@0 | 202 | // Enqueue a whole list of tasks. Empties the argument list. |
aoqi@0 | 203 | void GCTaskQueue::enqueue(GCTaskQueue* list) { |
aoqi@0 | 204 | if (TraceGCTaskQueue) { |
aoqi@0 | 205 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 206 | " GCTaskQueue::enqueue(list: " |
aoqi@0 | 207 | INTPTR_FORMAT ")", |
aoqi@0 | 208 | this, list); |
aoqi@0 | 209 | print("before:"); |
aoqi@0 | 210 | list->print("list:"); |
aoqi@0 | 211 | } |
aoqi@0 | 212 | if (list->is_empty()) { |
aoqi@0 | 213 | // Enqueuing the empty list: nothing to do. |
aoqi@0 | 214 | return; |
aoqi@0 | 215 | } |
aoqi@0 | 216 | uint list_length = list->length(); |
aoqi@0 | 217 | if (is_empty()) { |
aoqi@0 | 218 | // Enqueuing to empty list: just acquire elements. |
aoqi@0 | 219 | set_insert_end(list->insert_end()); |
aoqi@0 | 220 | set_remove_end(list->remove_end()); |
aoqi@0 | 221 | set_length(list_length); |
aoqi@0 | 222 | } else { |
aoqi@0 | 223 | // Prepend argument list to our queue. |
aoqi@0 | 224 | list->remove_end()->set_older(insert_end()); |
aoqi@0 | 225 | insert_end()->set_newer(list->remove_end()); |
aoqi@0 | 226 | set_insert_end(list->insert_end()); |
aoqi@0 | 227 | set_length(length() + list_length); |
aoqi@0 | 228 | // empty the argument list. |
aoqi@0 | 229 | } |
aoqi@0 | 230 | list->initialize(); |
aoqi@0 | 231 | if (TraceGCTaskQueue) { |
aoqi@0 | 232 | print("after:"); |
aoqi@0 | 233 | list->print("list:"); |
aoqi@0 | 234 | } |
aoqi@0 | 235 | verify_length(); |
aoqi@0 | 236 | } |
aoqi@0 | 237 | |
aoqi@0 | 238 | // Dequeue one task. |
aoqi@0 | 239 | GCTask* GCTaskQueue::dequeue() { |
aoqi@0 | 240 | if (TraceGCTaskQueue) { |
aoqi@0 | 241 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 242 | " GCTaskQueue::dequeue()", this); |
aoqi@0 | 243 | print("before:"); |
aoqi@0 | 244 | } |
aoqi@0 | 245 | assert(!is_empty(), "shouldn't dequeue from empty list"); |
aoqi@0 | 246 | GCTask* result = remove(); |
aoqi@0 | 247 | assert(result != NULL, "shouldn't have NULL task"); |
aoqi@0 | 248 | if (TraceGCTaskQueue) { |
aoqi@0 | 249 | tty->print_cr(" return: " INTPTR_FORMAT, result); |
aoqi@0 | 250 | print("after:"); |
aoqi@0 | 251 | } |
aoqi@0 | 252 | return result; |
aoqi@0 | 253 | } |
aoqi@0 | 254 | |
aoqi@0 | 255 | // Dequeue one task, preferring one with affinity. |
aoqi@0 | 256 | GCTask* GCTaskQueue::dequeue(uint affinity) { |
aoqi@0 | 257 | if (TraceGCTaskQueue) { |
aoqi@0 | 258 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 259 | " GCTaskQueue::dequeue(%u)", this, affinity); |
aoqi@0 | 260 | print("before:"); |
aoqi@0 | 261 | } |
aoqi@0 | 262 | assert(!is_empty(), "shouldn't dequeue from empty list"); |
aoqi@0 | 263 | // Look down to the next barrier for a task with this affinity. |
aoqi@0 | 264 | GCTask* result = NULL; |
aoqi@0 | 265 | for (GCTask* element = remove_end(); |
aoqi@0 | 266 | element != NULL; |
aoqi@0 | 267 | element = element->newer()) { |
aoqi@0 | 268 | if (element->is_barrier_task()) { |
aoqi@0 | 269 | // Don't consider barrier tasks, nor past them. |
aoqi@0 | 270 | result = NULL; |
aoqi@0 | 271 | break; |
aoqi@0 | 272 | } |
aoqi@0 | 273 | if (element->affinity() == affinity) { |
aoqi@0 | 274 | result = remove(element); |
aoqi@0 | 275 | break; |
aoqi@0 | 276 | } |
aoqi@0 | 277 | } |
aoqi@0 | 278 | // If we didn't find anything with affinity, just take the next task. |
aoqi@0 | 279 | if (result == NULL) { |
aoqi@0 | 280 | result = remove(); |
aoqi@0 | 281 | } |
aoqi@0 | 282 | if (TraceGCTaskQueue) { |
aoqi@0 | 283 | tty->print_cr(" return: " INTPTR_FORMAT, result); |
aoqi@0 | 284 | print("after:"); |
aoqi@0 | 285 | } |
aoqi@0 | 286 | return result; |
aoqi@0 | 287 | } |
aoqi@0 | 288 | |
aoqi@1 | 289 | // Dequeue one task, preferring one with numa_aware. |
aoqi@1 | 290 | GCTask* GCTaskQueue::numa_dequeue(int numa_id) { |
aoqi@1 | 291 | if (TraceGCTaskQueue) { |
aoqi@1 | 292 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@1 | 293 | " GCTaskQueue::dequeue(%u)", this, numa_id); |
aoqi@1 | 294 | print("before:"); |
aoqi@1 | 295 | } |
aoqi@1 | 296 | assert(!is_empty(), "shouldn't dequeue from empty list"); |
aoqi@1 | 297 | // Look down to the next barrier for a task with this affinity. |
aoqi@1 | 298 | GCTask* result = NULL; |
aoqi@1 | 299 | for (GCTask* element = remove_end(); |
aoqi@1 | 300 | element != NULL; |
aoqi@1 | 301 | element = element->newer()) { |
aoqi@1 | 302 | if (element->is_barrier_task()) { |
aoqi@1 | 303 | // Don't consider barrier tasks, nor past them. |
aoqi@1 | 304 | result = NULL; |
aoqi@1 | 305 | break; |
aoqi@1 | 306 | } |
aoqi@1 | 307 | if (element->task_numa_id() == numa_id) { |
aoqi@1 | 308 | result = remove(element); |
aoqi@1 | 309 | break; |
aoqi@1 | 310 | } |
aoqi@1 | 311 | } |
aoqi@1 | 312 | // If we didn't find anything with affinity, just take the next task. |
aoqi@1 | 313 | if (result == NULL) { |
aoqi@1 | 314 | result = remove(); |
aoqi@1 | 315 | } |
aoqi@1 | 316 | |
aoqi@1 | 317 | if (TraceGCTaskQueue) { |
aoqi@1 | 318 | tty->print_cr(" return: " INTPTR_FORMAT, result); |
aoqi@1 | 319 | print("after:"); |
aoqi@1 | 320 | } |
aoqi@1 | 321 | return result; |
aoqi@1 | 322 | } |
aoqi@1 | 323 | |
aoqi@0 | 324 | GCTask* GCTaskQueue::remove() { |
aoqi@0 | 325 | // Dequeue from remove end. |
aoqi@0 | 326 | GCTask* result = remove_end(); |
aoqi@0 | 327 | assert(result != NULL, "shouldn't have null task"); |
aoqi@0 | 328 | assert(result->older() == NULL, "not the remove_end"); |
aoqi@0 | 329 | set_remove_end(result->newer()); |
aoqi@0 | 330 | if (remove_end() == NULL) { |
aoqi@0 | 331 | assert(insert_end() == result, "not a singleton"); |
aoqi@0 | 332 | set_insert_end(NULL); |
aoqi@0 | 333 | } else { |
aoqi@0 | 334 | remove_end()->set_older(NULL); |
aoqi@0 | 335 | } |
aoqi@0 | 336 | result->set_newer(NULL); |
aoqi@0 | 337 | decrement_length(); |
aoqi@0 | 338 | assert(result->newer() == NULL, "shouldn't be on queue"); |
aoqi@0 | 339 | assert(result->older() == NULL, "shouldn't be on queue"); |
aoqi@0 | 340 | verify_length(); |
aoqi@0 | 341 | return result; |
aoqi@0 | 342 | } |
aoqi@0 | 343 | |
aoqi@0 | 344 | GCTask* GCTaskQueue::remove(GCTask* task) { |
aoqi@0 | 345 | // This is slightly more work, and has slightly fewer asserts |
aoqi@0 | 346 | // than removing from the remove end. |
aoqi@0 | 347 | assert(task != NULL, "shouldn't have null task"); |
aoqi@0 | 348 | GCTask* result = task; |
aoqi@0 | 349 | if (result->newer() != NULL) { |
aoqi@0 | 350 | result->newer()->set_older(result->older()); |
aoqi@0 | 351 | } else { |
aoqi@0 | 352 | assert(insert_end() == result, "not youngest"); |
aoqi@0 | 353 | set_insert_end(result->older()); |
aoqi@0 | 354 | } |
aoqi@0 | 355 | if (result->older() != NULL) { |
aoqi@0 | 356 | result->older()->set_newer(result->newer()); |
aoqi@0 | 357 | } else { |
aoqi@0 | 358 | assert(remove_end() == result, "not oldest"); |
aoqi@0 | 359 | set_remove_end(result->newer()); |
aoqi@0 | 360 | } |
aoqi@0 | 361 | result->set_newer(NULL); |
aoqi@0 | 362 | result->set_older(NULL); |
aoqi@0 | 363 | decrement_length(); |
aoqi@0 | 364 | verify_length(); |
aoqi@0 | 365 | return result; |
aoqi@0 | 366 | } |
aoqi@0 | 367 | |
aoqi@0 | 368 | NOT_PRODUCT( |
aoqi@0 | 369 | // Count the elements in the queue and verify the length against |
aoqi@0 | 370 | // that count. |
aoqi@0 | 371 | void GCTaskQueue::verify_length() const { |
aoqi@0 | 372 | uint count = 0; |
aoqi@0 | 373 | for (GCTask* element = insert_end(); |
aoqi@0 | 374 | element != NULL; |
aoqi@0 | 375 | element = element->older()) { |
aoqi@0 | 376 | |
aoqi@0 | 377 | count++; |
aoqi@0 | 378 | } |
aoqi@0 | 379 | assert(count == length(), "Length does not match queue"); |
aoqi@0 | 380 | } |
aoqi@0 | 381 | |
aoqi@0 | 382 | void GCTaskQueue::print(const char* message) const { |
aoqi@0 | 383 | tty->print_cr("[" INTPTR_FORMAT "] GCTaskQueue:" |
aoqi@0 | 384 | " insert_end: " INTPTR_FORMAT |
aoqi@0 | 385 | " remove_end: " INTPTR_FORMAT |
aoqi@0 | 386 | " length: %d" |
aoqi@0 | 387 | " %s", |
aoqi@0 | 388 | this, insert_end(), remove_end(), length(), message); |
aoqi@0 | 389 | uint count = 0; |
aoqi@0 | 390 | for (GCTask* element = insert_end(); |
aoqi@0 | 391 | element != NULL; |
aoqi@0 | 392 | element = element->older()) { |
aoqi@0 | 393 | element->print(" "); |
aoqi@0 | 394 | count++; |
aoqi@0 | 395 | tty->cr(); |
aoqi@0 | 396 | } |
aoqi@0 | 397 | tty->print("Total tasks: %d", count); |
aoqi@0 | 398 | } |
aoqi@0 | 399 | ) |
aoqi@0 | 400 | |
aoqi@0 | 401 | // |
aoqi@0 | 402 | // SynchronizedGCTaskQueue |
aoqi@0 | 403 | // |
aoqi@0 | 404 | |
aoqi@0 | 405 | SynchronizedGCTaskQueue::SynchronizedGCTaskQueue(GCTaskQueue* queue_arg, |
aoqi@0 | 406 | Monitor * lock_arg) : |
aoqi@0 | 407 | _unsynchronized_queue(queue_arg), |
aoqi@0 | 408 | _lock(lock_arg) { |
aoqi@0 | 409 | assert(unsynchronized_queue() != NULL, "null queue"); |
aoqi@0 | 410 | assert(lock() != NULL, "null lock"); |
aoqi@0 | 411 | } |
aoqi@0 | 412 | |
aoqi@0 | 413 | SynchronizedGCTaskQueue::~SynchronizedGCTaskQueue() { |
aoqi@0 | 414 | // Nothing to do. |
aoqi@0 | 415 | } |
aoqi@0 | 416 | |
aoqi@0 | 417 | // |
aoqi@0 | 418 | // GCTaskManager |
aoqi@0 | 419 | // |
aoqi@0 | 420 | GCTaskManager::GCTaskManager(uint workers) : |
aoqi@0 | 421 | _workers(workers), |
aoqi@0 | 422 | _active_workers(0), |
aoqi@0 | 423 | _idle_workers(0), |
aoqi@0 | 424 | _ndc(NULL) { |
aoqi@0 | 425 | initialize(); |
aoqi@0 | 426 | } |
aoqi@0 | 427 | |
aoqi@0 | 428 | GCTaskManager::GCTaskManager(uint workers, NotifyDoneClosure* ndc) : |
aoqi@0 | 429 | _workers(workers), |
aoqi@0 | 430 | _active_workers(0), |
aoqi@0 | 431 | _idle_workers(0), |
aoqi@0 | 432 | _ndc(ndc) { |
aoqi@0 | 433 | initialize(); |
aoqi@0 | 434 | } |
aoqi@0 | 435 | |
aoqi@0 | 436 | void GCTaskManager::initialize() { |
aoqi@0 | 437 | if (TraceGCTaskManager) { |
aoqi@0 | 438 | tty->print_cr("GCTaskManager::initialize: workers: %u", workers()); |
aoqi@0 | 439 | } |
aoqi@0 | 440 | assert(workers() != 0, "no workers"); |
aoqi@0 | 441 | _monitor = new Monitor(Mutex::barrier, // rank |
aoqi@0 | 442 | "GCTaskManager monitor", // name |
aoqi@0 | 443 | Mutex::_allow_vm_block_flag); // allow_vm_block |
aoqi@0 | 444 | // The queue for the GCTaskManager must be a CHeapObj. |
aoqi@0 | 445 | GCTaskQueue* unsynchronized_queue = GCTaskQueue::create_on_c_heap(); |
aoqi@0 | 446 | _queue = SynchronizedGCTaskQueue::create(unsynchronized_queue, lock()); |
aoqi@0 | 447 | _noop_task = NoopGCTask::create_on_c_heap(); |
aoqi@0 | 448 | _idle_inactive_task = WaitForBarrierGCTask::create_on_c_heap(); |
aoqi@0 | 449 | _resource_flag = NEW_C_HEAP_ARRAY(bool, workers(), mtGC); |
aoqi@0 | 450 | { |
aoqi@0 | 451 | // Set up worker threads. |
aoqi@0 | 452 | // Distribute the workers among the available processors, |
aoqi@0 | 453 | // unless we were told not to, or if the os doesn't want to. |
aoqi@0 | 454 | uint* processor_assignment = NEW_C_HEAP_ARRAY(uint, workers(), mtGC); |
aoqi@1 | 455 | if (BindGCTaskThreadsToCPUs || |
aoqi@0 | 456 | !os::distribute_processes(workers(), processor_assignment)) { |
aoqi@0 | 457 | for (uint a = 0; a < workers(); a += 1) { |
aoqi@1 | 458 | /*2014/7/7 Liao: Bind GCThread [a] to processor [a] */ |
aoqi@1 | 459 | processor_assignment[a] = a; |
aoqi@0 | 460 | } |
aoqi@0 | 461 | } |
aoqi@0 | 462 | _thread = NEW_C_HEAP_ARRAY(GCTaskThread*, workers(), mtGC); |
aoqi@0 | 463 | for (uint t = 0; t < workers(); t += 1) { |
aoqi@0 | 464 | set_thread(t, GCTaskThread::create(this, t, processor_assignment[t])); |
aoqi@0 | 465 | } |
aoqi@0 | 466 | if (TraceGCTaskThread) { |
aoqi@0 | 467 | tty->print("GCTaskManager::initialize: distribution:"); |
aoqi@0 | 468 | for (uint t = 0; t < workers(); t += 1) { |
aoqi@0 | 469 | tty->print(" %u", processor_assignment[t]); |
aoqi@0 | 470 | } |
aoqi@0 | 471 | tty->cr(); |
aoqi@0 | 472 | } |
aoqi@0 | 473 | FREE_C_HEAP_ARRAY(uint, processor_assignment, mtGC); |
aoqi@0 | 474 | } |
aoqi@0 | 475 | reset_busy_workers(); |
aoqi@0 | 476 | set_unblocked(); |
aoqi@0 | 477 | for (uint w = 0; w < workers(); w += 1) { |
aoqi@0 | 478 | set_resource_flag(w, false); |
aoqi@0 | 479 | } |
aoqi@0 | 480 | reset_delivered_tasks(); |
aoqi@0 | 481 | reset_completed_tasks(); |
aoqi@0 | 482 | reset_noop_tasks(); |
aoqi@0 | 483 | reset_barriers(); |
aoqi@0 | 484 | reset_emptied_queue(); |
aoqi@0 | 485 | for (uint s = 0; s < workers(); s += 1) { |
aoqi@0 | 486 | thread(s)->start(); |
aoqi@0 | 487 | } |
aoqi@0 | 488 | } |
aoqi@0 | 489 | |
aoqi@0 | 490 | GCTaskManager::~GCTaskManager() { |
aoqi@0 | 491 | assert(busy_workers() == 0, "still have busy workers"); |
aoqi@0 | 492 | assert(queue()->is_empty(), "still have queued work"); |
aoqi@0 | 493 | NoopGCTask::destroy(_noop_task); |
aoqi@0 | 494 | _noop_task = NULL; |
aoqi@0 | 495 | WaitForBarrierGCTask::destroy(_idle_inactive_task); |
aoqi@0 | 496 | _idle_inactive_task = NULL; |
aoqi@0 | 497 | if (_thread != NULL) { |
aoqi@0 | 498 | for (uint i = 0; i < workers(); i += 1) { |
aoqi@0 | 499 | GCTaskThread::destroy(thread(i)); |
aoqi@0 | 500 | set_thread(i, NULL); |
aoqi@0 | 501 | } |
aoqi@0 | 502 | FREE_C_HEAP_ARRAY(GCTaskThread*, _thread, mtGC); |
aoqi@0 | 503 | _thread = NULL; |
aoqi@0 | 504 | } |
aoqi@0 | 505 | if (_resource_flag != NULL) { |
aoqi@0 | 506 | FREE_C_HEAP_ARRAY(bool, _resource_flag, mtGC); |
aoqi@0 | 507 | _resource_flag = NULL; |
aoqi@0 | 508 | } |
aoqi@0 | 509 | if (queue() != NULL) { |
aoqi@0 | 510 | GCTaskQueue* unsynchronized_queue = queue()->unsynchronized_queue(); |
aoqi@0 | 511 | GCTaskQueue::destroy(unsynchronized_queue); |
aoqi@0 | 512 | SynchronizedGCTaskQueue::destroy(queue()); |
aoqi@0 | 513 | _queue = NULL; |
aoqi@0 | 514 | } |
aoqi@0 | 515 | if (monitor() != NULL) { |
aoqi@0 | 516 | delete monitor(); |
aoqi@0 | 517 | _monitor = NULL; |
aoqi@0 | 518 | } |
aoqi@0 | 519 | } |
aoqi@0 | 520 | |
aoqi@0 | 521 | void GCTaskManager::set_active_gang() { |
aoqi@0 | 522 | _active_workers = |
aoqi@0 | 523 | AdaptiveSizePolicy::calc_active_workers(workers(), |
aoqi@0 | 524 | active_workers(), |
aoqi@0 | 525 | Threads::number_of_non_daemon_threads()); |
aoqi@0 | 526 | |
aoqi@0 | 527 | assert(!all_workers_active() || active_workers() == ParallelGCThreads, |
aoqi@0 | 528 | err_msg("all_workers_active() is incorrect: " |
aoqi@0 | 529 | "active %d ParallelGCThreads %d", active_workers(), |
aoqi@0 | 530 | ParallelGCThreads)); |
aoqi@0 | 531 | if (TraceDynamicGCThreads) { |
aoqi@0 | 532 | gclog_or_tty->print_cr("GCTaskManager::set_active_gang(): " |
aoqi@0 | 533 | "all_workers_active() %d workers %d " |
aoqi@0 | 534 | "active %d ParallelGCThreads %d ", |
aoqi@0 | 535 | all_workers_active(), workers(), active_workers(), |
aoqi@0 | 536 | ParallelGCThreads); |
aoqi@0 | 537 | } |
aoqi@0 | 538 | } |
aoqi@0 | 539 | |
aoqi@0 | 540 | // Create IdleGCTasks for inactive workers. |
aoqi@0 | 541 | // Creates tasks in a ResourceArea and assumes |
aoqi@0 | 542 | // an appropriate ResourceMark. |
aoqi@0 | 543 | void GCTaskManager::task_idle_workers() { |
aoqi@0 | 544 | { |
aoqi@0 | 545 | int more_inactive_workers = 0; |
aoqi@0 | 546 | { |
aoqi@0 | 547 | // Stop any idle tasks from exiting their IdleGCTask's |
aoqi@0 | 548 | // and get the count for additional IdleGCTask's under |
aoqi@0 | 549 | // the GCTaskManager's monitor so that the "more_inactive_workers" |
aoqi@0 | 550 | // count is correct. |
aoqi@0 | 551 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 552 | _idle_inactive_task->set_should_wait(true); |
aoqi@0 | 553 | // active_workers are a number being requested. idle_workers |
aoqi@0 | 554 | // are the number currently idle. If all the workers are being |
aoqi@0 | 555 | // requested to be active but some are already idle, reduce |
aoqi@0 | 556 | // the number of active_workers to be consistent with the |
aoqi@0 | 557 | // number of idle_workers. The idle_workers are stuck in |
aoqi@0 | 558 | // idle tasks and will no longer be release (since a new GC |
aoqi@0 | 559 | // is starting). Try later to release enough idle_workers |
aoqi@0 | 560 | // to allow the desired number of active_workers. |
aoqi@0 | 561 | more_inactive_workers = |
aoqi@0 | 562 | workers() - active_workers() - idle_workers(); |
aoqi@0 | 563 | if (more_inactive_workers < 0) { |
aoqi@0 | 564 | int reduced_active_workers = active_workers() + more_inactive_workers; |
aoqi@0 | 565 | set_active_workers(reduced_active_workers); |
aoqi@0 | 566 | more_inactive_workers = 0; |
aoqi@0 | 567 | } |
aoqi@0 | 568 | if (TraceDynamicGCThreads) { |
aoqi@0 | 569 | gclog_or_tty->print_cr("JT: %d workers %d active %d " |
aoqi@0 | 570 | "idle %d more %d", |
aoqi@0 | 571 | Threads::number_of_non_daemon_threads(), |
aoqi@0 | 572 | workers(), |
aoqi@0 | 573 | active_workers(), |
aoqi@0 | 574 | idle_workers(), |
aoqi@0 | 575 | more_inactive_workers); |
aoqi@0 | 576 | } |
aoqi@0 | 577 | } |
aoqi@0 | 578 | GCTaskQueue* q = GCTaskQueue::create(); |
aoqi@0 | 579 | for(uint i = 0; i < (uint) more_inactive_workers; i++) { |
aoqi@0 | 580 | q->enqueue(IdleGCTask::create_on_c_heap()); |
aoqi@0 | 581 | increment_idle_workers(); |
aoqi@0 | 582 | } |
aoqi@0 | 583 | assert(workers() == active_workers() + idle_workers(), |
aoqi@0 | 584 | "total workers should equal active + inactive"); |
aoqi@0 | 585 | add_list(q); |
aoqi@0 | 586 | // GCTaskQueue* q was created in a ResourceArea so a |
aoqi@0 | 587 | // destroy() call is not needed. |
aoqi@0 | 588 | } |
aoqi@0 | 589 | } |
aoqi@0 | 590 | |
aoqi@0 | 591 | void GCTaskManager::release_idle_workers() { |
aoqi@0 | 592 | { |
aoqi@0 | 593 | MutexLockerEx ml(monitor(), |
aoqi@0 | 594 | Mutex::_no_safepoint_check_flag); |
aoqi@0 | 595 | _idle_inactive_task->set_should_wait(false); |
aoqi@0 | 596 | monitor()->notify_all(); |
aoqi@0 | 597 | // Release monitor |
aoqi@0 | 598 | } |
aoqi@0 | 599 | } |
aoqi@0 | 600 | |
aoqi@0 | 601 | void GCTaskManager::print_task_time_stamps() { |
aoqi@0 | 602 | for(uint i=0; i<ParallelGCThreads; i++) { |
aoqi@0 | 603 | GCTaskThread* t = thread(i); |
aoqi@0 | 604 | t->print_task_time_stamps(); |
aoqi@0 | 605 | } |
aoqi@0 | 606 | } |
aoqi@0 | 607 | |
aoqi@0 | 608 | void GCTaskManager::print_threads_on(outputStream* st) { |
aoqi@0 | 609 | uint num_thr = workers(); |
aoqi@0 | 610 | for (uint i = 0; i < num_thr; i++) { |
aoqi@0 | 611 | thread(i)->print_on(st); |
aoqi@0 | 612 | st->cr(); |
aoqi@0 | 613 | } |
aoqi@0 | 614 | } |
aoqi@0 | 615 | |
aoqi@0 | 616 | void GCTaskManager::threads_do(ThreadClosure* tc) { |
aoqi@0 | 617 | assert(tc != NULL, "Null ThreadClosure"); |
aoqi@0 | 618 | uint num_thr = workers(); |
aoqi@0 | 619 | for (uint i = 0; i < num_thr; i++) { |
aoqi@0 | 620 | tc->do_thread(thread(i)); |
aoqi@0 | 621 | } |
aoqi@0 | 622 | } |
aoqi@0 | 623 | |
aoqi@0 | 624 | GCTaskThread* GCTaskManager::thread(uint which) { |
aoqi@0 | 625 | assert(which < workers(), "index out of bounds"); |
aoqi@0 | 626 | assert(_thread[which] != NULL, "shouldn't have null thread"); |
aoqi@0 | 627 | return _thread[which]; |
aoqi@0 | 628 | } |
aoqi@0 | 629 | |
aoqi@0 | 630 | void GCTaskManager::set_thread(uint which, GCTaskThread* value) { |
aoqi@0 | 631 | assert(which < workers(), "index out of bounds"); |
aoqi@0 | 632 | assert(value != NULL, "shouldn't have null thread"); |
aoqi@0 | 633 | _thread[which] = value; |
aoqi@0 | 634 | } |
aoqi@0 | 635 | |
aoqi@0 | 636 | void GCTaskManager::add_task(GCTask* task) { |
aoqi@0 | 637 | assert(task != NULL, "shouldn't have null task"); |
aoqi@0 | 638 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 639 | if (TraceGCTaskManager) { |
aoqi@0 | 640 | tty->print_cr("GCTaskManager::add_task(" INTPTR_FORMAT " [%s])", |
aoqi@0 | 641 | task, GCTask::Kind::to_string(task->kind())); |
aoqi@0 | 642 | } |
aoqi@0 | 643 | queue()->enqueue(task); |
aoqi@0 | 644 | // Notify with the lock held to avoid missed notifies. |
aoqi@0 | 645 | if (TraceGCTaskManager) { |
aoqi@0 | 646 | tty->print_cr(" GCTaskManager::add_task (%s)->notify_all", |
aoqi@0 | 647 | monitor()->name()); |
aoqi@0 | 648 | } |
aoqi@0 | 649 | (void) monitor()->notify_all(); |
aoqi@0 | 650 | // Release monitor(). |
aoqi@0 | 651 | } |
aoqi@0 | 652 | |
aoqi@0 | 653 | void GCTaskManager::add_list(GCTaskQueue* list) { |
aoqi@0 | 654 | assert(list != NULL, "shouldn't have null task"); |
aoqi@0 | 655 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 656 | if (TraceGCTaskManager) { |
aoqi@0 | 657 | tty->print_cr("GCTaskManager::add_list(%u)", list->length()); |
aoqi@0 | 658 | } |
aoqi@0 | 659 | queue()->enqueue(list); |
aoqi@0 | 660 | // Notify with the lock held to avoid missed notifies. |
aoqi@0 | 661 | if (TraceGCTaskManager) { |
aoqi@0 | 662 | tty->print_cr(" GCTaskManager::add_list (%s)->notify_all", |
aoqi@0 | 663 | monitor()->name()); |
aoqi@0 | 664 | } |
aoqi@0 | 665 | (void) monitor()->notify_all(); |
aoqi@0 | 666 | // Release monitor(). |
aoqi@0 | 667 | } |
aoqi@0 | 668 | |
aoqi@0 | 669 | // GC workers wait in get_task() for new work to be added |
aoqi@0 | 670 | // to the GCTaskManager's queue. When new work is added, |
aoqi@0 | 671 | // a notify is sent to the waiting GC workers which then |
aoqi@0 | 672 | // compete to get tasks. If a GC worker wakes up and there |
aoqi@0 | 673 | // is no work on the queue, it is given a noop_task to execute |
aoqi@0 | 674 | // and then loops to find more work. |
aoqi@0 | 675 | |
aoqi@0 | 676 | GCTask* GCTaskManager::get_task(uint which) { |
aoqi@0 | 677 | GCTask* result = NULL; |
aoqi@0 | 678 | // Grab the queue lock. |
aoqi@0 | 679 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 680 | // Wait while the queue is block or |
aoqi@0 | 681 | // there is nothing to do, except maybe release resources. |
aoqi@0 | 682 | while (is_blocked() || |
aoqi@0 | 683 | (queue()->is_empty() && !should_release_resources(which))) { |
aoqi@0 | 684 | if (TraceGCTaskManager) { |
aoqi@0 | 685 | tty->print_cr("GCTaskManager::get_task(%u)" |
aoqi@0 | 686 | " blocked: %s" |
aoqi@0 | 687 | " empty: %s" |
aoqi@0 | 688 | " release: %s", |
aoqi@0 | 689 | which, |
aoqi@0 | 690 | is_blocked() ? "true" : "false", |
aoqi@0 | 691 | queue()->is_empty() ? "true" : "false", |
aoqi@0 | 692 | should_release_resources(which) ? "true" : "false"); |
aoqi@0 | 693 | tty->print_cr(" => (%s)->wait()", |
aoqi@0 | 694 | monitor()->name()); |
aoqi@0 | 695 | } |
aoqi@0 | 696 | monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
aoqi@0 | 697 | } |
aoqi@0 | 698 | // We've reacquired the queue lock here. |
aoqi@0 | 699 | // Figure out which condition caused us to exit the loop above. |
aoqi@0 | 700 | if (!queue()->is_empty()) { |
aoqi@0 | 701 | if (UseGCTaskAffinity) { |
aoqi@0 | 702 | result = queue()->dequeue(which); |
aoqi@0 | 703 | } else { |
aoqi@1 | 704 | /* 2014/7/7 Liao: GCThread get task on numa machines with numa_aware. */ |
aoqi@1 | 705 | if(UseNUMAThreadRoots) { |
aoqi@1 | 706 | result = queue()->numa_dequeue(os::numa_get_group_id()); |
aoqi@1 | 707 | } |
aoqi@1 | 708 | else { |
aoqi@1 | 709 | result = queue()->dequeue(); |
aoqi@1 | 710 | } |
aoqi@0 | 711 | } |
aoqi@0 | 712 | if (result->is_barrier_task()) { |
aoqi@0 | 713 | assert(which != sentinel_worker(), |
aoqi@0 | 714 | "blocker shouldn't be bogus"); |
aoqi@0 | 715 | set_blocking_worker(which); |
aoqi@0 | 716 | } |
aoqi@0 | 717 | } else { |
aoqi@0 | 718 | // The queue is empty, but we were woken up. |
aoqi@0 | 719 | // Just hand back a Noop task, |
aoqi@0 | 720 | // in case someone wanted us to release resources, or whatever. |
aoqi@0 | 721 | result = noop_task(); |
aoqi@0 | 722 | increment_noop_tasks(); |
aoqi@0 | 723 | } |
aoqi@0 | 724 | assert(result != NULL, "shouldn't have null task"); |
aoqi@0 | 725 | if (TraceGCTaskManager) { |
aoqi@0 | 726 | tty->print_cr("GCTaskManager::get_task(%u) => " INTPTR_FORMAT " [%s]", |
aoqi@0 | 727 | which, result, GCTask::Kind::to_string(result->kind())); |
aoqi@0 | 728 | tty->print_cr(" %s", result->name()); |
aoqi@0 | 729 | } |
aoqi@0 | 730 | if (!result->is_idle_task()) { |
aoqi@0 | 731 | increment_busy_workers(); |
aoqi@0 | 732 | increment_delivered_tasks(); |
aoqi@0 | 733 | } |
aoqi@0 | 734 | return result; |
aoqi@0 | 735 | // Release monitor(). |
aoqi@0 | 736 | } |
aoqi@0 | 737 | |
aoqi@0 | 738 | void GCTaskManager::note_completion(uint which) { |
aoqi@0 | 739 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 740 | if (TraceGCTaskManager) { |
aoqi@0 | 741 | tty->print_cr("GCTaskManager::note_completion(%u)", which); |
aoqi@0 | 742 | } |
aoqi@0 | 743 | // If we are blocked, check if the completing thread is the blocker. |
aoqi@0 | 744 | if (blocking_worker() == which) { |
aoqi@0 | 745 | assert(blocking_worker() != sentinel_worker(), |
aoqi@0 | 746 | "blocker shouldn't be bogus"); |
aoqi@0 | 747 | increment_barriers(); |
aoqi@0 | 748 | set_unblocked(); |
aoqi@0 | 749 | } |
aoqi@0 | 750 | increment_completed_tasks(); |
aoqi@0 | 751 | uint active = decrement_busy_workers(); |
aoqi@0 | 752 | if ((active == 0) && (queue()->is_empty())) { |
aoqi@0 | 753 | increment_emptied_queue(); |
aoqi@0 | 754 | if (TraceGCTaskManager) { |
aoqi@0 | 755 | tty->print_cr(" GCTaskManager::note_completion(%u) done", which); |
aoqi@0 | 756 | } |
aoqi@0 | 757 | // Notify client that we are done. |
aoqi@0 | 758 | NotifyDoneClosure* ndc = notify_done_closure(); |
aoqi@0 | 759 | if (ndc != NULL) { |
aoqi@0 | 760 | ndc->notify(this); |
aoqi@0 | 761 | } |
aoqi@0 | 762 | } |
aoqi@0 | 763 | if (TraceGCTaskManager) { |
aoqi@0 | 764 | tty->print_cr(" GCTaskManager::note_completion(%u) (%s)->notify_all", |
aoqi@0 | 765 | which, monitor()->name()); |
aoqi@0 | 766 | tty->print_cr(" " |
aoqi@0 | 767 | " blocked: %s" |
aoqi@0 | 768 | " empty: %s" |
aoqi@0 | 769 | " release: %s", |
aoqi@0 | 770 | is_blocked() ? "true" : "false", |
aoqi@0 | 771 | queue()->is_empty() ? "true" : "false", |
aoqi@0 | 772 | should_release_resources(which) ? "true" : "false"); |
aoqi@0 | 773 | tty->print_cr(" " |
aoqi@0 | 774 | " delivered: %u" |
aoqi@0 | 775 | " completed: %u" |
aoqi@0 | 776 | " barriers: %u" |
aoqi@0 | 777 | " emptied: %u", |
aoqi@0 | 778 | delivered_tasks(), |
aoqi@0 | 779 | completed_tasks(), |
aoqi@0 | 780 | barriers(), |
aoqi@0 | 781 | emptied_queue()); |
aoqi@0 | 782 | } |
aoqi@0 | 783 | // Tell everyone that a task has completed. |
aoqi@0 | 784 | (void) monitor()->notify_all(); |
aoqi@0 | 785 | // Release monitor(). |
aoqi@0 | 786 | } |
aoqi@0 | 787 | |
aoqi@0 | 788 | uint GCTaskManager::increment_busy_workers() { |
aoqi@0 | 789 | assert(queue()->own_lock(), "don't own the lock"); |
aoqi@0 | 790 | _busy_workers += 1; |
aoqi@0 | 791 | return _busy_workers; |
aoqi@0 | 792 | } |
aoqi@0 | 793 | |
aoqi@0 | 794 | uint GCTaskManager::decrement_busy_workers() { |
aoqi@0 | 795 | assert(queue()->own_lock(), "don't own the lock"); |
aoqi@0 | 796 | assert(_busy_workers > 0, "About to make a mistake"); |
aoqi@0 | 797 | _busy_workers -= 1; |
aoqi@0 | 798 | return _busy_workers; |
aoqi@0 | 799 | } |
aoqi@0 | 800 | |
aoqi@0 | 801 | void GCTaskManager::release_all_resources() { |
aoqi@0 | 802 | // If you want this to be done atomically, do it in a BarrierGCTask. |
aoqi@0 | 803 | for (uint i = 0; i < workers(); i += 1) { |
aoqi@0 | 804 | set_resource_flag(i, true); |
aoqi@0 | 805 | } |
aoqi@0 | 806 | } |
aoqi@0 | 807 | |
aoqi@0 | 808 | bool GCTaskManager::should_release_resources(uint which) { |
aoqi@0 | 809 | // This can be done without a lock because each thread reads one element. |
aoqi@0 | 810 | return resource_flag(which); |
aoqi@0 | 811 | } |
aoqi@0 | 812 | |
aoqi@0 | 813 | void GCTaskManager::note_release(uint which) { |
aoqi@0 | 814 | // This can be done without a lock because each thread writes one element. |
aoqi@0 | 815 | set_resource_flag(which, false); |
aoqi@0 | 816 | } |
aoqi@0 | 817 | |
aoqi@0 | 818 | // "list" contains tasks that are ready to execute. Those |
aoqi@0 | 819 | // tasks are added to the GCTaskManager's queue of tasks and |
aoqi@0 | 820 | // then the GC workers are notified that there is new work to |
aoqi@0 | 821 | // do. |
aoqi@0 | 822 | // |
aoqi@0 | 823 | // Typically different types of tasks can be added to the "list". |
aoqi@0 | 824 | // For example in PSScavenge OldToYoungRootsTask, SerialOldToYoungRootsTask, |
aoqi@0 | 825 | // ScavengeRootsTask, and StealTask tasks are all added to the list |
aoqi@0 | 826 | // and then the GC workers are notified of new work. The tasks are |
aoqi@0 | 827 | // handed out in the order in which they are added to the list |
aoqi@0 | 828 | // (although execution is not necessarily in that order). As long |
aoqi@0 | 829 | // as any tasks are running the GCTaskManager will wait for execution |
aoqi@0 | 830 | // to complete. GC workers that execute a stealing task remain in |
aoqi@0 | 831 | // the stealing task until all stealing tasks have completed. The load |
aoqi@0 | 832 | // balancing afforded by the stealing tasks work best if the stealing |
aoqi@0 | 833 | // tasks are added last to the list. |
aoqi@0 | 834 | |
aoqi@0 | 835 | void GCTaskManager::execute_and_wait(GCTaskQueue* list) { |
aoqi@0 | 836 | WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); |
aoqi@0 | 837 | list->enqueue(fin); |
aoqi@0 | 838 | // The barrier task will be read by one of the GC |
aoqi@0 | 839 | // workers once it is added to the list of tasks. |
aoqi@0 | 840 | // Be sure that is globally visible before the |
aoqi@0 | 841 | // GC worker reads it (which is after the task is added |
aoqi@0 | 842 | // to the list of tasks below). |
aoqi@0 | 843 | OrderAccess::storestore(); |
aoqi@0 | 844 | add_list(list); |
aoqi@0 | 845 | fin->wait_for(true /* reset */); |
aoqi@0 | 846 | // We have to release the barrier tasks! |
aoqi@0 | 847 | WaitForBarrierGCTask::destroy(fin); |
aoqi@0 | 848 | } |
aoqi@0 | 849 | |
aoqi@0 | 850 | bool GCTaskManager::resource_flag(uint which) { |
aoqi@0 | 851 | assert(which < workers(), "index out of bounds"); |
aoqi@0 | 852 | return _resource_flag[which]; |
aoqi@0 | 853 | } |
aoqi@0 | 854 | |
aoqi@0 | 855 | void GCTaskManager::set_resource_flag(uint which, bool value) { |
aoqi@0 | 856 | assert(which < workers(), "index out of bounds"); |
aoqi@0 | 857 | _resource_flag[which] = value; |
aoqi@0 | 858 | } |
aoqi@0 | 859 | |
aoqi@0 | 860 | // |
aoqi@0 | 861 | // NoopGCTask |
aoqi@0 | 862 | // |
aoqi@0 | 863 | |
aoqi@0 | 864 | NoopGCTask* NoopGCTask::create() { |
aoqi@0 | 865 | NoopGCTask* result = new NoopGCTask(false); |
aoqi@0 | 866 | return result; |
aoqi@0 | 867 | } |
aoqi@0 | 868 | |
aoqi@0 | 869 | NoopGCTask* NoopGCTask::create_on_c_heap() { |
aoqi@0 | 870 | NoopGCTask* result = new(ResourceObj::C_HEAP, mtGC) NoopGCTask(true); |
aoqi@0 | 871 | return result; |
aoqi@0 | 872 | } |
aoqi@0 | 873 | |
aoqi@0 | 874 | void NoopGCTask::destroy(NoopGCTask* that) { |
aoqi@0 | 875 | if (that != NULL) { |
aoqi@0 | 876 | that->destruct(); |
aoqi@0 | 877 | if (that->is_c_heap_obj()) { |
aoqi@0 | 878 | FreeHeap(that); |
aoqi@0 | 879 | } |
aoqi@0 | 880 | } |
aoqi@0 | 881 | } |
aoqi@0 | 882 | |
aoqi@0 | 883 | void NoopGCTask::destruct() { |
aoqi@0 | 884 | // This has to know it's superclass structure, just like the constructor. |
aoqi@0 | 885 | this->GCTask::destruct(); |
aoqi@0 | 886 | // Nothing else to do. |
aoqi@0 | 887 | } |
aoqi@0 | 888 | |
aoqi@0 | 889 | // |
aoqi@0 | 890 | // IdleGCTask |
aoqi@0 | 891 | // |
aoqi@0 | 892 | |
aoqi@0 | 893 | IdleGCTask* IdleGCTask::create() { |
aoqi@0 | 894 | IdleGCTask* result = new IdleGCTask(false); |
aoqi@0 | 895 | assert(UseDynamicNumberOfGCThreads, |
aoqi@0 | 896 | "Should only be used with dynamic GC thread"); |
aoqi@0 | 897 | return result; |
aoqi@0 | 898 | } |
aoqi@0 | 899 | |
aoqi@0 | 900 | IdleGCTask* IdleGCTask::create_on_c_heap() { |
aoqi@0 | 901 | IdleGCTask* result = new(ResourceObj::C_HEAP, mtGC) IdleGCTask(true); |
aoqi@0 | 902 | assert(UseDynamicNumberOfGCThreads, |
aoqi@0 | 903 | "Should only be used with dynamic GC thread"); |
aoqi@0 | 904 | return result; |
aoqi@0 | 905 | } |
aoqi@0 | 906 | |
aoqi@0 | 907 | void IdleGCTask::do_it(GCTaskManager* manager, uint which) { |
aoqi@0 | 908 | WaitForBarrierGCTask* wait_for_task = manager->idle_inactive_task(); |
aoqi@0 | 909 | if (TraceGCTaskManager) { |
aoqi@0 | 910 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 911 | " IdleGCTask:::do_it()" |
aoqi@0 | 912 | " should_wait: %s", |
aoqi@0 | 913 | this, wait_for_task->should_wait() ? "true" : "false"); |
aoqi@0 | 914 | } |
aoqi@0 | 915 | MutexLockerEx ml(manager->monitor(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 916 | if (TraceDynamicGCThreads) { |
aoqi@0 | 917 | gclog_or_tty->print_cr("--- idle %d", which); |
aoqi@0 | 918 | } |
aoqi@0 | 919 | // Increment has to be done when the idle tasks are created. |
aoqi@0 | 920 | // manager->increment_idle_workers(); |
aoqi@0 | 921 | manager->monitor()->notify_all(); |
aoqi@0 | 922 | while (wait_for_task->should_wait()) { |
aoqi@0 | 923 | if (TraceGCTaskManager) { |
aoqi@0 | 924 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 925 | " IdleGCTask::do_it()" |
aoqi@0 | 926 | " [" INTPTR_FORMAT "] (%s)->wait()", |
aoqi@0 | 927 | this, manager->monitor(), manager->monitor()->name()); |
aoqi@0 | 928 | } |
aoqi@0 | 929 | manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
aoqi@0 | 930 | } |
aoqi@0 | 931 | manager->decrement_idle_workers(); |
aoqi@0 | 932 | if (TraceDynamicGCThreads) { |
aoqi@0 | 933 | gclog_or_tty->print_cr("--- release %d", which); |
aoqi@0 | 934 | } |
aoqi@0 | 935 | if (TraceGCTaskManager) { |
aoqi@0 | 936 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 937 | " IdleGCTask::do_it() returns" |
aoqi@0 | 938 | " should_wait: %s", |
aoqi@0 | 939 | this, wait_for_task->should_wait() ? "true" : "false"); |
aoqi@0 | 940 | } |
aoqi@0 | 941 | // Release monitor(). |
aoqi@0 | 942 | } |
aoqi@0 | 943 | |
aoqi@0 | 944 | void IdleGCTask::destroy(IdleGCTask* that) { |
aoqi@0 | 945 | if (that != NULL) { |
aoqi@0 | 946 | that->destruct(); |
aoqi@0 | 947 | if (that->is_c_heap_obj()) { |
aoqi@0 | 948 | FreeHeap(that); |
aoqi@0 | 949 | } |
aoqi@0 | 950 | } |
aoqi@0 | 951 | } |
aoqi@0 | 952 | |
aoqi@0 | 953 | void IdleGCTask::destruct() { |
aoqi@0 | 954 | // This has to know it's superclass structure, just like the constructor. |
aoqi@0 | 955 | this->GCTask::destruct(); |
aoqi@0 | 956 | // Nothing else to do. |
aoqi@0 | 957 | } |
aoqi@0 | 958 | |
aoqi@0 | 959 | // |
aoqi@0 | 960 | // BarrierGCTask |
aoqi@0 | 961 | // |
aoqi@0 | 962 | |
aoqi@0 | 963 | void BarrierGCTask::do_it(GCTaskManager* manager, uint which) { |
aoqi@0 | 964 | // Wait for this to be the only busy worker. |
aoqi@0 | 965 | // ??? I thought of having a StackObj class |
aoqi@0 | 966 | // whose constructor would grab the lock and come to the barrier, |
aoqi@0 | 967 | // and whose destructor would release the lock, |
aoqi@0 | 968 | // but that seems like too much mechanism for two lines of code. |
aoqi@0 | 969 | MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 970 | do_it_internal(manager, which); |
aoqi@0 | 971 | // Release manager->lock(). |
aoqi@0 | 972 | } |
aoqi@0 | 973 | |
aoqi@0 | 974 | void BarrierGCTask::do_it_internal(GCTaskManager* manager, uint which) { |
aoqi@0 | 975 | // Wait for this to be the only busy worker. |
aoqi@0 | 976 | assert(manager->monitor()->owned_by_self(), "don't own the lock"); |
aoqi@0 | 977 | assert(manager->is_blocked(), "manager isn't blocked"); |
aoqi@0 | 978 | while (manager->busy_workers() > 1) { |
aoqi@0 | 979 | if (TraceGCTaskManager) { |
aoqi@0 | 980 | tty->print_cr("BarrierGCTask::do_it(%u) waiting on %u workers", |
aoqi@0 | 981 | which, manager->busy_workers()); |
aoqi@0 | 982 | } |
aoqi@0 | 983 | manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
aoqi@0 | 984 | } |
aoqi@0 | 985 | } |
aoqi@0 | 986 | |
aoqi@0 | 987 | void BarrierGCTask::destruct() { |
aoqi@0 | 988 | this->GCTask::destruct(); |
aoqi@0 | 989 | // Nothing else to do. |
aoqi@0 | 990 | } |
aoqi@0 | 991 | |
aoqi@0 | 992 | // |
aoqi@0 | 993 | // ReleasingBarrierGCTask |
aoqi@0 | 994 | // |
aoqi@0 | 995 | |
aoqi@0 | 996 | void ReleasingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { |
aoqi@0 | 997 | MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 998 | do_it_internal(manager, which); |
aoqi@0 | 999 | manager->release_all_resources(); |
aoqi@0 | 1000 | // Release manager->lock(). |
aoqi@0 | 1001 | } |
aoqi@0 | 1002 | |
aoqi@0 | 1003 | void ReleasingBarrierGCTask::destruct() { |
aoqi@0 | 1004 | this->BarrierGCTask::destruct(); |
aoqi@0 | 1005 | // Nothing else to do. |
aoqi@0 | 1006 | } |
aoqi@0 | 1007 | |
aoqi@0 | 1008 | // |
aoqi@0 | 1009 | // NotifyingBarrierGCTask |
aoqi@0 | 1010 | // |
aoqi@0 | 1011 | |
aoqi@0 | 1012 | void NotifyingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { |
aoqi@0 | 1013 | MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 1014 | do_it_internal(manager, which); |
aoqi@0 | 1015 | NotifyDoneClosure* ndc = notify_done_closure(); |
aoqi@0 | 1016 | if (ndc != NULL) { |
aoqi@0 | 1017 | ndc->notify(manager); |
aoqi@0 | 1018 | } |
aoqi@0 | 1019 | // Release manager->lock(). |
aoqi@0 | 1020 | } |
aoqi@0 | 1021 | |
aoqi@0 | 1022 | void NotifyingBarrierGCTask::destruct() { |
aoqi@0 | 1023 | this->BarrierGCTask::destruct(); |
aoqi@0 | 1024 | // Nothing else to do. |
aoqi@0 | 1025 | } |
aoqi@0 | 1026 | |
aoqi@0 | 1027 | // |
aoqi@0 | 1028 | // WaitForBarrierGCTask |
aoqi@0 | 1029 | // |
aoqi@0 | 1030 | WaitForBarrierGCTask* WaitForBarrierGCTask::create() { |
aoqi@0 | 1031 | WaitForBarrierGCTask* result = new WaitForBarrierGCTask(false); |
aoqi@0 | 1032 | return result; |
aoqi@0 | 1033 | } |
aoqi@0 | 1034 | |
aoqi@0 | 1035 | WaitForBarrierGCTask* WaitForBarrierGCTask::create_on_c_heap() { |
aoqi@0 | 1036 | WaitForBarrierGCTask* result = |
aoqi@0 | 1037 | new (ResourceObj::C_HEAP, mtGC) WaitForBarrierGCTask(true); |
aoqi@0 | 1038 | return result; |
aoqi@0 | 1039 | } |
aoqi@0 | 1040 | |
aoqi@0 | 1041 | WaitForBarrierGCTask::WaitForBarrierGCTask(bool on_c_heap) : |
aoqi@0 | 1042 | _is_c_heap_obj(on_c_heap) { |
aoqi@0 | 1043 | _monitor = MonitorSupply::reserve(); |
aoqi@0 | 1044 | set_should_wait(true); |
aoqi@0 | 1045 | if (TraceGCTaskManager) { |
aoqi@0 | 1046 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 1047 | " WaitForBarrierGCTask::WaitForBarrierGCTask()" |
aoqi@0 | 1048 | " monitor: " INTPTR_FORMAT, |
aoqi@0 | 1049 | this, monitor()); |
aoqi@0 | 1050 | } |
aoqi@0 | 1051 | } |
aoqi@0 | 1052 | |
aoqi@0 | 1053 | void WaitForBarrierGCTask::destroy(WaitForBarrierGCTask* that) { |
aoqi@0 | 1054 | if (that != NULL) { |
aoqi@0 | 1055 | if (TraceGCTaskManager) { |
aoqi@0 | 1056 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 1057 | " WaitForBarrierGCTask::destroy()" |
aoqi@0 | 1058 | " is_c_heap_obj: %s" |
aoqi@0 | 1059 | " monitor: " INTPTR_FORMAT, |
aoqi@0 | 1060 | that, |
aoqi@0 | 1061 | that->is_c_heap_obj() ? "true" : "false", |
aoqi@0 | 1062 | that->monitor()); |
aoqi@0 | 1063 | } |
aoqi@0 | 1064 | that->destruct(); |
aoqi@0 | 1065 | if (that->is_c_heap_obj()) { |
aoqi@0 | 1066 | FreeHeap(that); |
aoqi@0 | 1067 | } |
aoqi@0 | 1068 | } |
aoqi@0 | 1069 | } |
aoqi@0 | 1070 | |
aoqi@0 | 1071 | void WaitForBarrierGCTask::destruct() { |
aoqi@0 | 1072 | assert(monitor() != NULL, "monitor should not be NULL"); |
aoqi@0 | 1073 | if (TraceGCTaskManager) { |
aoqi@0 | 1074 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 1075 | " WaitForBarrierGCTask::destruct()" |
aoqi@0 | 1076 | " monitor: " INTPTR_FORMAT, |
aoqi@0 | 1077 | this, monitor()); |
aoqi@0 | 1078 | } |
aoqi@0 | 1079 | this->BarrierGCTask::destruct(); |
aoqi@0 | 1080 | // Clean up that should be in the destructor, |
aoqi@0 | 1081 | // except that ResourceMarks don't call destructors. |
aoqi@0 | 1082 | if (monitor() != NULL) { |
aoqi@0 | 1083 | MonitorSupply::release(monitor()); |
aoqi@0 | 1084 | } |
aoqi@0 | 1085 | _monitor = (Monitor*) 0xDEAD000F; |
aoqi@0 | 1086 | } |
aoqi@0 | 1087 | |
aoqi@0 | 1088 | void WaitForBarrierGCTask::do_it(GCTaskManager* manager, uint which) { |
aoqi@0 | 1089 | if (TraceGCTaskManager) { |
aoqi@0 | 1090 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 1091 | " WaitForBarrierGCTask::do_it() waiting for idle" |
aoqi@0 | 1092 | " monitor: " INTPTR_FORMAT, |
aoqi@0 | 1093 | this, monitor()); |
aoqi@0 | 1094 | } |
aoqi@0 | 1095 | { |
aoqi@0 | 1096 | // First, wait for the barrier to arrive. |
aoqi@0 | 1097 | MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 1098 | do_it_internal(manager, which); |
aoqi@0 | 1099 | // Release manager->lock(). |
aoqi@0 | 1100 | } |
aoqi@0 | 1101 | { |
aoqi@0 | 1102 | // Then notify the waiter. |
aoqi@0 | 1103 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 1104 | set_should_wait(false); |
aoqi@0 | 1105 | // Waiter doesn't miss the notify in the wait_for method |
aoqi@0 | 1106 | // since it checks the flag after grabbing the monitor. |
aoqi@0 | 1107 | if (TraceGCTaskManager) { |
aoqi@0 | 1108 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 1109 | " WaitForBarrierGCTask::do_it()" |
aoqi@0 | 1110 | " [" INTPTR_FORMAT "] (%s)->notify_all()", |
aoqi@0 | 1111 | this, monitor(), monitor()->name()); |
aoqi@0 | 1112 | } |
aoqi@0 | 1113 | monitor()->notify_all(); |
aoqi@0 | 1114 | // Release monitor(). |
aoqi@0 | 1115 | } |
aoqi@0 | 1116 | } |
aoqi@0 | 1117 | |
aoqi@0 | 1118 | void WaitForBarrierGCTask::wait_for(bool reset) { |
aoqi@0 | 1119 | if (TraceGCTaskManager) { |
aoqi@0 | 1120 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 1121 | " WaitForBarrierGCTask::wait_for()" |
aoqi@0 | 1122 | " should_wait: %s", |
aoqi@0 | 1123 | this, should_wait() ? "true" : "false"); |
aoqi@0 | 1124 | } |
aoqi@0 | 1125 | { |
aoqi@0 | 1126 | // Grab the lock and check again. |
aoqi@0 | 1127 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
aoqi@0 | 1128 | while (should_wait()) { |
aoqi@0 | 1129 | if (TraceGCTaskManager) { |
aoqi@0 | 1130 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 1131 | " WaitForBarrierGCTask::wait_for()" |
aoqi@0 | 1132 | " [" INTPTR_FORMAT "] (%s)->wait()", |
aoqi@0 | 1133 | this, monitor(), monitor()->name()); |
aoqi@0 | 1134 | } |
aoqi@0 | 1135 | monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
aoqi@0 | 1136 | } |
aoqi@0 | 1137 | // Reset the flag in case someone reuses this task. |
aoqi@0 | 1138 | if (reset) { |
aoqi@0 | 1139 | set_should_wait(true); |
aoqi@0 | 1140 | } |
aoqi@0 | 1141 | if (TraceGCTaskManager) { |
aoqi@0 | 1142 | tty->print_cr("[" INTPTR_FORMAT "]" |
aoqi@0 | 1143 | " WaitForBarrierGCTask::wait_for() returns" |
aoqi@0 | 1144 | " should_wait: %s", |
aoqi@0 | 1145 | this, should_wait() ? "true" : "false"); |
aoqi@0 | 1146 | } |
aoqi@0 | 1147 | // Release monitor(). |
aoqi@0 | 1148 | } |
aoqi@0 | 1149 | } |
aoqi@0 | 1150 | |
aoqi@0 | 1151 | Mutex* MonitorSupply::_lock = NULL; |
aoqi@0 | 1152 | GrowableArray<Monitor*>* MonitorSupply::_freelist = NULL; |
aoqi@0 | 1153 | |
aoqi@0 | 1154 | Monitor* MonitorSupply::reserve() { |
aoqi@0 | 1155 | Monitor* result = NULL; |
aoqi@0 | 1156 | // Lazy initialization: possible race. |
aoqi@0 | 1157 | if (lock() == NULL) { |
aoqi@0 | 1158 | _lock = new Mutex(Mutex::barrier, // rank |
aoqi@0 | 1159 | "MonitorSupply mutex", // name |
aoqi@0 | 1160 | Mutex::_allow_vm_block_flag); // allow_vm_block |
aoqi@0 | 1161 | } |
aoqi@0 | 1162 | { |
aoqi@0 | 1163 | MutexLockerEx ml(lock()); |
aoqi@0 | 1164 | // Lazy initialization. |
aoqi@0 | 1165 | if (freelist() == NULL) { |
aoqi@0 | 1166 | _freelist = |
aoqi@0 | 1167 | new(ResourceObj::C_HEAP, mtGC) GrowableArray<Monitor*>(ParallelGCThreads, |
aoqi@0 | 1168 | true); |
aoqi@0 | 1169 | } |
aoqi@0 | 1170 | if (! freelist()->is_empty()) { |
aoqi@0 | 1171 | result = freelist()->pop(); |
aoqi@0 | 1172 | } else { |
aoqi@0 | 1173 | result = new Monitor(Mutex::barrier, // rank |
aoqi@0 | 1174 | "MonitorSupply monitor", // name |
aoqi@0 | 1175 | Mutex::_allow_vm_block_flag); // allow_vm_block |
aoqi@0 | 1176 | } |
aoqi@0 | 1177 | guarantee(result != NULL, "shouldn't return NULL"); |
aoqi@0 | 1178 | assert(!result->is_locked(), "shouldn't be locked"); |
aoqi@0 | 1179 | // release lock(). |
aoqi@0 | 1180 | } |
aoqi@0 | 1181 | return result; |
aoqi@0 | 1182 | } |
aoqi@0 | 1183 | |
aoqi@0 | 1184 | void MonitorSupply::release(Monitor* instance) { |
aoqi@0 | 1185 | assert(instance != NULL, "shouldn't release NULL"); |
aoqi@0 | 1186 | assert(!instance->is_locked(), "shouldn't be locked"); |
aoqi@0 | 1187 | { |
aoqi@0 | 1188 | MutexLockerEx ml(lock()); |
aoqi@0 | 1189 | freelist()->push(instance); |
aoqi@0 | 1190 | // release lock(). |
aoqi@0 | 1191 | } |
aoqi@0 | 1192 | } |