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annotate src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children | cd3ef3fd20dd |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2001, 2006, 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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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_concurrentMarkSweepThread.cpp.incl" | |
| 27 | |
| 28 // ======= Concurrent Mark Sweep Thread ======== | |
| 29 | |
| 30 // The CMS thread is created when Concurrent Mark Sweep is used in the | |
| 31 // older of two generations in a generational memory system. | |
| 32 | |
| 33 ConcurrentMarkSweepThread* | |
| 34 ConcurrentMarkSweepThread::_cmst = NULL; | |
| 35 CMSCollector* ConcurrentMarkSweepThread::_collector = NULL; | |
| 36 bool ConcurrentMarkSweepThread::_should_terminate = false; | |
| 37 int ConcurrentMarkSweepThread::_CMS_flag = CMS_nil; | |
| 38 | |
| 39 volatile jint ConcurrentMarkSweepThread::_pending_yields = 0; | |
| 40 volatile jint ConcurrentMarkSweepThread::_pending_decrements = 0; | |
| 41 | |
| 42 volatile bool ConcurrentMarkSweepThread::_icms_enabled = false; | |
| 43 volatile bool ConcurrentMarkSweepThread::_should_run = false; | |
| 44 // When icms is enabled, the icms thread is stopped until explicitly | |
| 45 // started. | |
| 46 volatile bool ConcurrentMarkSweepThread::_should_stop = true; | |
| 47 | |
| 48 SurrogateLockerThread* | |
| 49 ConcurrentMarkSweepThread::_slt = NULL; | |
| 50 SurrogateLockerThread::SLT_msg_type | |
| 51 ConcurrentMarkSweepThread::_sltBuffer = SurrogateLockerThread::empty; | |
| 52 Monitor* | |
| 53 ConcurrentMarkSweepThread::_sltMonitor = NULL; | |
| 54 | |
| 55 ConcurrentMarkSweepThread::ConcurrentMarkSweepThread(CMSCollector* collector) | |
| 56 : ConcurrentGCThread() { | |
| 57 assert(UseConcMarkSweepGC, "UseConcMarkSweepGC should be set"); | |
| 58 assert(_cmst == NULL, "CMS thread already created"); | |
| 59 _cmst = this; | |
| 60 assert(_collector == NULL, "Collector already set"); | |
| 61 _collector = collector; | |
| 62 | |
| 63 set_name("Concurrent Mark-Sweep GC Thread"); | |
| 64 | |
| 65 if (os::create_thread(this, os::cgc_thread)) { | |
| 66 // XXX: need to set this to low priority | |
| 67 // unless "agressive mode" set; priority | |
| 68 // should be just less than that of VMThread. | |
| 69 os::set_priority(this, NearMaxPriority); | |
| 70 if (!DisableStartThread) { | |
| 71 os::start_thread(this); | |
| 72 } | |
| 73 } | |
| 74 _sltMonitor = SLT_lock; | |
| 75 set_icms_enabled(CMSIncrementalMode); | |
| 76 } | |
| 77 | |
| 78 void ConcurrentMarkSweepThread::run() { | |
| 79 assert(this == cmst(), "just checking"); | |
| 80 | |
| 81 this->record_stack_base_and_size(); | |
| 82 this->initialize_thread_local_storage(); | |
| 83 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 84 // From this time Thread::current() should be working. | |
| 85 assert(this == Thread::current(), "just checking"); | |
| 86 if (BindCMSThreadToCPU && !os::bind_to_processor(CPUForCMSThread)) { | |
| 87 warning("Couldn't bind CMS thread to processor %u", CPUForCMSThread); | |
| 88 } | |
| 89 // Wait until Universe::is_fully_initialized() | |
| 90 { | |
| 91 CMSLoopCountWarn loopX("CMS::run", "waiting for " | |
| 92 "Universe::is_fully_initialized()", 2); | |
| 93 MutexLockerEx x(CGC_lock, true); | |
| 94 set_CMS_flag(CMS_cms_wants_token); | |
| 95 // Wait until Universe is initialized and all initialization is completed. | |
| 96 while (!is_init_completed() && !Universe::is_fully_initialized() && | |
| 97 !_should_terminate) { | |
| 98 CGC_lock->wait(true, 200); | |
| 99 loopX.tick(); | |
| 100 } | |
| 101 // Wait until the surrogate locker thread that will do | |
| 102 // pending list locking on our behalf has been created. | |
| 103 // We cannot start the SLT thread ourselves since we need | |
| 104 // to be a JavaThread to do so. | |
| 105 CMSLoopCountWarn loopY("CMS::run", "waiting for SLT installation", 2); | |
| 106 while (_slt == NULL && !_should_terminate) { | |
| 107 CGC_lock->wait(true, 200); | |
| 108 loopY.tick(); | |
| 109 } | |
| 110 clear_CMS_flag(CMS_cms_wants_token); | |
| 111 } | |
| 112 | |
| 113 while (!_should_terminate) { | |
| 114 sleepBeforeNextCycle(); | |
| 115 if (_should_terminate) break; | |
| 116 _collector->collect_in_background(false); // !clear_all_soft_refs | |
| 117 } | |
| 118 assert(_should_terminate, "just checking"); | |
| 119 // Check that the state of any protocol for synchronization | |
| 120 // between background (CMS) and foreground collector is "clean" | |
| 121 // (i.e. will not potentially block the foreground collector, | |
| 122 // requiring action by us). | |
| 123 verify_ok_to_terminate(); | |
| 124 // Signal that it is terminated | |
| 125 { | |
| 126 MutexLockerEx mu(Terminator_lock, | |
| 127 Mutex::_no_safepoint_check_flag); | |
| 128 assert(_cmst == this, "Weird!"); | |
| 129 _cmst = NULL; | |
| 130 Terminator_lock->notify(); | |
| 131 } | |
| 132 | |
| 133 // Thread destructor usually does this.. | |
| 134 ThreadLocalStorage::set_thread(NULL); | |
| 135 } | |
| 136 | |
| 137 #ifndef PRODUCT | |
| 138 void ConcurrentMarkSweepThread::verify_ok_to_terminate() const { | |
| 139 assert(!(CGC_lock->owned_by_self() || cms_thread_has_cms_token() || | |
| 140 cms_thread_wants_cms_token()), | |
| 141 "Must renounce all worldly possessions and desires for nirvana"); | |
| 142 _collector->verify_ok_to_terminate(); | |
| 143 } | |
| 144 #endif | |
| 145 | |
| 146 // create and start a new ConcurrentMarkSweep Thread for given CMS generation | |
| 147 ConcurrentMarkSweepThread* ConcurrentMarkSweepThread::start(CMSCollector* collector) { | |
| 148 if (!_should_terminate) { | |
| 149 assert(cmst() == NULL, "start() called twice?"); | |
| 150 ConcurrentMarkSweepThread* th = new ConcurrentMarkSweepThread(collector); | |
| 151 assert(cmst() == th, "Where did the just-created CMS thread go?"); | |
| 152 return th; | |
| 153 } | |
| 154 return NULL; | |
| 155 } | |
| 156 | |
| 157 void ConcurrentMarkSweepThread::stop() { | |
| 158 if (CMSIncrementalMode) { | |
| 159 // Disable incremental mode and wake up the thread so it notices the change. | |
| 160 disable_icms(); | |
| 161 start_icms(); | |
| 162 } | |
| 163 // it is ok to take late safepoints here, if needed | |
| 164 { | |
| 165 MutexLockerEx x(Terminator_lock); | |
| 166 _should_terminate = true; | |
| 167 } | |
| 168 { // Now post a notify on CGC_lock so as to nudge | |
| 169 // CMS thread(s) that might be slumbering in | |
| 170 // sleepBeforeNextCycle. | |
| 171 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
| 172 CGC_lock->notify_all(); | |
| 173 } | |
| 174 { // Now wait until (all) CMS thread(s) have exited | |
| 175 MutexLockerEx x(Terminator_lock); | |
| 176 while(cmst() != NULL) { | |
| 177 Terminator_lock->wait(); | |
| 178 } | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 void ConcurrentMarkSweepThread::threads_do(ThreadClosure* tc) { | |
| 183 assert(tc != NULL, "Null ThreadClosure"); | |
| 184 if (_cmst != NULL) { | |
| 185 tc->do_thread(_cmst); | |
| 186 } | |
| 187 assert(Universe::is_fully_initialized(), | |
| 188 "Called too early, make sure heap is fully initialized"); | |
| 189 if (_collector != NULL) { | |
| 190 AbstractWorkGang* gang = _collector->conc_workers(); | |
| 191 if (gang != NULL) { | |
| 192 gang->threads_do(tc); | |
| 193 } | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 void ConcurrentMarkSweepThread::print_on(outputStream* st) const { | |
| 198 st->print("\"%s\" ", name()); | |
| 199 Thread::print_on(st); | |
| 200 st->cr(); | |
| 201 } | |
| 202 | |
| 203 void ConcurrentMarkSweepThread::print_all_on(outputStream* st) { | |
| 204 if (_cmst != NULL) { | |
| 205 _cmst->print_on(st); | |
| 206 } | |
| 207 if (_collector != NULL) { | |
| 208 AbstractWorkGang* gang = _collector->conc_workers(); | |
| 209 if (gang != NULL) { | |
| 210 gang->print_worker_threads_on(st); | |
| 211 } | |
| 212 } | |
| 213 } | |
| 214 | |
| 215 void ConcurrentMarkSweepThread::synchronize(bool is_cms_thread) { | |
| 216 assert(UseConcMarkSweepGC, "just checking"); | |
| 217 | |
| 218 MutexLockerEx x(CGC_lock, | |
| 219 Mutex::_no_safepoint_check_flag); | |
| 220 if (!is_cms_thread) { | |
| 221 assert(Thread::current()->is_VM_thread(), "Not a VM thread"); | |
| 222 CMSSynchronousYieldRequest yr; | |
| 223 while (CMS_flag_is_set(CMS_cms_has_token)) { | |
| 224 // indicate that we want to get the token | |
| 225 set_CMS_flag(CMS_vm_wants_token); | |
| 226 CGC_lock->wait(true); | |
| 227 } | |
| 228 // claim the token and proceed | |
| 229 clear_CMS_flag(CMS_vm_wants_token); | |
| 230 set_CMS_flag(CMS_vm_has_token); | |
| 231 } else { | |
| 232 assert(Thread::current()->is_ConcurrentGC_thread(), | |
| 233 "Not a CMS thread"); | |
| 234 // The following barrier assumes there's only one CMS thread. | |
| 235 // This will need to be modified is there are more CMS threads than one. | |
| 236 while (CMS_flag_is_set(CMS_vm_has_token | CMS_vm_wants_token)) { | |
| 237 set_CMS_flag(CMS_cms_wants_token); | |
| 238 CGC_lock->wait(true); | |
| 239 } | |
| 240 // claim the token | |
| 241 clear_CMS_flag(CMS_cms_wants_token); | |
| 242 set_CMS_flag(CMS_cms_has_token); | |
| 243 } | |
| 244 } | |
| 245 | |
| 246 void ConcurrentMarkSweepThread::desynchronize(bool is_cms_thread) { | |
| 247 assert(UseConcMarkSweepGC, "just checking"); | |
| 248 | |
| 249 MutexLockerEx x(CGC_lock, | |
| 250 Mutex::_no_safepoint_check_flag); | |
| 251 if (!is_cms_thread) { | |
| 252 assert(Thread::current()->is_VM_thread(), "Not a VM thread"); | |
| 253 assert(CMS_flag_is_set(CMS_vm_has_token), "just checking"); | |
| 254 clear_CMS_flag(CMS_vm_has_token); | |
| 255 if (CMS_flag_is_set(CMS_cms_wants_token)) { | |
| 256 // wake-up a waiting CMS thread | |
| 257 CGC_lock->notify(); | |
| 258 } | |
| 259 assert(!CMS_flag_is_set(CMS_vm_has_token | CMS_vm_wants_token), | |
| 260 "Should have been cleared"); | |
| 261 } else { | |
| 262 assert(Thread::current()->is_ConcurrentGC_thread(), | |
| 263 "Not a CMS thread"); | |
| 264 assert(CMS_flag_is_set(CMS_cms_has_token), "just checking"); | |
| 265 clear_CMS_flag(CMS_cms_has_token); | |
| 266 if (CMS_flag_is_set(CMS_vm_wants_token)) { | |
| 267 // wake-up a waiting VM thread | |
| 268 CGC_lock->notify(); | |
| 269 } | |
| 270 assert(!CMS_flag_is_set(CMS_cms_has_token | CMS_cms_wants_token), | |
| 271 "Should have been cleared"); | |
| 272 } | |
| 273 } | |
| 274 | |
| 275 // Wait until the next synchronous GC or a timeout, whichever is earlier. | |
| 276 void ConcurrentMarkSweepThread::wait_on_cms_lock(long t) { | |
| 277 MutexLockerEx x(CGC_lock, | |
| 278 Mutex::_no_safepoint_check_flag); | |
| 279 set_CMS_flag(CMS_cms_wants_token); // to provoke notifies | |
| 280 CGC_lock->wait(Mutex::_no_safepoint_check_flag, t); | |
| 281 clear_CMS_flag(CMS_cms_wants_token); | |
| 282 assert(!CMS_flag_is_set(CMS_cms_has_token | CMS_cms_wants_token), | |
| 283 "Should not be set"); | |
| 284 } | |
| 285 | |
| 286 void ConcurrentMarkSweepThread::sleepBeforeNextCycle() { | |
| 287 while (!_should_terminate) { | |
| 288 if (CMSIncrementalMode) { | |
| 289 icms_wait(); | |
| 290 return; | |
| 291 } else { | |
| 292 // Wait until the next synchronous GC or a timeout, whichever is earlier | |
| 293 wait_on_cms_lock(CMSWaitDuration); | |
| 294 } | |
| 295 // Check if we should start a CMS collection cycle | |
| 296 if (_collector->shouldConcurrentCollect()) { | |
| 297 return; | |
| 298 } | |
| 299 // .. collection criterion not yet met, let's go back | |
| 300 // and wait some more | |
| 301 } | |
| 302 } | |
| 303 | |
| 304 // Incremental CMS | |
| 305 void ConcurrentMarkSweepThread::start_icms() { | |
| 306 assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking"); | |
| 307 MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag); | |
| 308 trace_state("start_icms"); | |
| 309 _should_run = true; | |
| 310 iCMS_lock->notify_all(); | |
| 311 } | |
| 312 | |
| 313 void ConcurrentMarkSweepThread::stop_icms() { | |
| 314 assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking"); | |
| 315 MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag); | |
| 316 if (!_should_stop) { | |
| 317 trace_state("stop_icms"); | |
| 318 _should_stop = true; | |
| 319 _should_run = false; | |
| 320 asynchronous_yield_request(); | |
| 321 iCMS_lock->notify_all(); | |
| 322 } | |
| 323 } | |
| 324 | |
| 325 void ConcurrentMarkSweepThread::icms_wait() { | |
| 326 assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking"); | |
| 327 if (_should_stop && icms_enabled()) { | |
| 328 MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag); | |
| 329 trace_state("pause_icms"); | |
| 330 _collector->stats().stop_cms_timer(); | |
| 331 while(!_should_run && icms_enabled()) { | |
| 332 iCMS_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 333 } | |
| 334 _collector->stats().start_cms_timer(); | |
| 335 _should_stop = false; | |
| 336 trace_state("pause_icms end"); | |
| 337 } | |
| 338 } | |
| 339 | |
| 340 // Note: this method, although exported by the ConcurrentMarkSweepThread, | |
| 341 // which is a non-JavaThread, can only be called by a JavaThread. | |
| 342 // Currently this is done at vm creation time (post-vm-init) by the | |
| 343 // main/Primordial (Java)Thread. | |
| 344 // XXX Consider changing this in the future to allow the CMS thread | |
| 345 // itself to create this thread? | |
| 346 void ConcurrentMarkSweepThread::makeSurrogateLockerThread(TRAPS) { | |
| 347 assert(UseConcMarkSweepGC, "SLT thread needed only for CMS GC"); | |
| 348 assert(_slt == NULL, "SLT already created"); | |
| 349 _slt = SurrogateLockerThread::make(THREAD); | |
| 350 } |