Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.cpp @ 8679:a252e688abcf
7189971: Implement CMSWaitDuration for non-incremental mode of CMS
Reviewed-by: jmasa, johnc, ysr
Contributed-by: michal@frajt.eu
| author | jmasa |
|---|---|
| date | Fri, 01 Feb 2013 17:02:36 -0800 |
| parents | a7509aff1b06 |
| children | f2110083203d |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 "classfile/systemDictionary.hpp" | |
| 27 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp" | |
| 28 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 29 #include "memory/genCollectedHeap.hpp" | |
| 30 #include "oops/instanceRefKlass.hpp" | |
| 31 #include "oops/oop.inline.hpp" | |
| 32 #include "runtime/init.hpp" | |
| 33 #include "runtime/interfaceSupport.hpp" | |
| 34 #include "runtime/java.hpp" | |
| 35 #include "runtime/javaCalls.hpp" | |
| 36 #include "runtime/mutexLocker.hpp" | |
| 37 #include "runtime/os.hpp" | |
| 38 #include "runtime/vmThread.hpp" | |
| 0 | 39 |
| 40 // ======= Concurrent Mark Sweep Thread ======== | |
| 41 | |
| 42 // The CMS thread is created when Concurrent Mark Sweep is used in the | |
| 43 // older of two generations in a generational memory system. | |
| 44 | |
| 45 ConcurrentMarkSweepThread* | |
| 46 ConcurrentMarkSweepThread::_cmst = NULL; | |
| 47 CMSCollector* ConcurrentMarkSweepThread::_collector = NULL; | |
| 48 bool ConcurrentMarkSweepThread::_should_terminate = false; | |
| 49 int ConcurrentMarkSweepThread::_CMS_flag = CMS_nil; | |
| 50 | |
| 51 volatile jint ConcurrentMarkSweepThread::_pending_yields = 0; | |
| 52 volatile jint ConcurrentMarkSweepThread::_pending_decrements = 0; | |
| 53 | |
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54 volatile jint ConcurrentMarkSweepThread::_icms_disabled = 0; |
| 0 | 55 volatile bool ConcurrentMarkSweepThread::_should_run = false; |
| 56 // When icms is enabled, the icms thread is stopped until explicitly | |
| 57 // started. | |
| 58 volatile bool ConcurrentMarkSweepThread::_should_stop = true; | |
| 59 | |
| 60 SurrogateLockerThread* | |
| 61 ConcurrentMarkSweepThread::_slt = NULL; | |
| 62 SurrogateLockerThread::SLT_msg_type | |
| 63 ConcurrentMarkSweepThread::_sltBuffer = SurrogateLockerThread::empty; | |
| 64 Monitor* | |
| 65 ConcurrentMarkSweepThread::_sltMonitor = NULL; | |
| 66 | |
| 67 ConcurrentMarkSweepThread::ConcurrentMarkSweepThread(CMSCollector* collector) | |
| 68 : ConcurrentGCThread() { | |
| 69 assert(UseConcMarkSweepGC, "UseConcMarkSweepGC should be set"); | |
| 70 assert(_cmst == NULL, "CMS thread already created"); | |
| 71 _cmst = this; | |
| 72 assert(_collector == NULL, "Collector already set"); | |
| 73 _collector = collector; | |
| 74 | |
| 75 set_name("Concurrent Mark-Sweep GC Thread"); | |
| 76 | |
| 77 if (os::create_thread(this, os::cgc_thread)) { | |
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78 // An old comment here said: "Priority should be just less |
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79 // than that of VMThread". Since the VMThread runs at |
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80 // NearMaxPriority, the old comment was inaccurate, but |
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81 // changing the default priority to NearMaxPriority-1 |
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82 // could change current behavior, so the default of |
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83 // NearMaxPriority stays in place. |
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84 // |
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85 // Note that there's a possibility of the VMThread |
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86 // starving if UseCriticalCMSThreadPriority is on. |
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87 // That won't happen on Solaris for various reasons, |
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88 // but may well happen on non-Solaris platforms. |
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89 int native_prio; |
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90 if (UseCriticalCMSThreadPriority) { |
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91 native_prio = os::java_to_os_priority[CriticalPriority]; |
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92 } else { |
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93 native_prio = os::java_to_os_priority[NearMaxPriority]; |
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94 } |
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95 os::set_native_priority(this, native_prio); |
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96 |
| 0 | 97 if (!DisableStartThread) { |
| 98 os::start_thread(this); | |
| 99 } | |
| 100 } | |
| 101 _sltMonitor = SLT_lock; | |
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102 assert(!CMSIncrementalMode || icms_is_enabled(), "Error"); |
| 0 | 103 } |
| 104 | |
| 105 void ConcurrentMarkSweepThread::run() { | |
| 106 assert(this == cmst(), "just checking"); | |
| 107 | |
| 108 this->record_stack_base_and_size(); | |
| 109 this->initialize_thread_local_storage(); | |
| 110 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 111 // From this time Thread::current() should be working. | |
| 112 assert(this == Thread::current(), "just checking"); | |
| 113 if (BindCMSThreadToCPU && !os::bind_to_processor(CPUForCMSThread)) { | |
| 114 warning("Couldn't bind CMS thread to processor %u", CPUForCMSThread); | |
| 115 } | |
| 116 // Wait until Universe::is_fully_initialized() | |
| 117 { | |
| 118 CMSLoopCountWarn loopX("CMS::run", "waiting for " | |
| 119 "Universe::is_fully_initialized()", 2); | |
| 120 MutexLockerEx x(CGC_lock, true); | |
| 121 set_CMS_flag(CMS_cms_wants_token); | |
| 122 // Wait until Universe is initialized and all initialization is completed. | |
| 123 while (!is_init_completed() && !Universe::is_fully_initialized() && | |
| 124 !_should_terminate) { | |
| 125 CGC_lock->wait(true, 200); | |
| 126 loopX.tick(); | |
| 127 } | |
| 128 // Wait until the surrogate locker thread that will do | |
| 129 // pending list locking on our behalf has been created. | |
| 130 // We cannot start the SLT thread ourselves since we need | |
| 131 // to be a JavaThread to do so. | |
| 132 CMSLoopCountWarn loopY("CMS::run", "waiting for SLT installation", 2); | |
| 133 while (_slt == NULL && !_should_terminate) { | |
| 134 CGC_lock->wait(true, 200); | |
| 135 loopY.tick(); | |
| 136 } | |
| 137 clear_CMS_flag(CMS_cms_wants_token); | |
| 138 } | |
| 139 | |
| 140 while (!_should_terminate) { | |
| 141 sleepBeforeNextCycle(); | |
| 142 if (_should_terminate) break; | |
| 143 _collector->collect_in_background(false); // !clear_all_soft_refs | |
| 144 } | |
| 145 assert(_should_terminate, "just checking"); | |
| 146 // Check that the state of any protocol for synchronization | |
| 147 // between background (CMS) and foreground collector is "clean" | |
| 148 // (i.e. will not potentially block the foreground collector, | |
| 149 // requiring action by us). | |
| 150 verify_ok_to_terminate(); | |
| 151 // Signal that it is terminated | |
| 152 { | |
| 153 MutexLockerEx mu(Terminator_lock, | |
| 154 Mutex::_no_safepoint_check_flag); | |
| 155 assert(_cmst == this, "Weird!"); | |
| 156 _cmst = NULL; | |
| 157 Terminator_lock->notify(); | |
| 158 } | |
| 159 | |
| 160 // Thread destructor usually does this.. | |
| 161 ThreadLocalStorage::set_thread(NULL); | |
| 162 } | |
| 163 | |
| 164 #ifndef PRODUCT | |
| 165 void ConcurrentMarkSweepThread::verify_ok_to_terminate() const { | |
| 166 assert(!(CGC_lock->owned_by_self() || cms_thread_has_cms_token() || | |
| 167 cms_thread_wants_cms_token()), | |
| 168 "Must renounce all worldly possessions and desires for nirvana"); | |
| 169 _collector->verify_ok_to_terminate(); | |
| 170 } | |
| 171 #endif | |
| 172 | |
| 173 // create and start a new ConcurrentMarkSweep Thread for given CMS generation | |
| 174 ConcurrentMarkSweepThread* ConcurrentMarkSweepThread::start(CMSCollector* collector) { | |
| 175 if (!_should_terminate) { | |
| 176 assert(cmst() == NULL, "start() called twice?"); | |
| 177 ConcurrentMarkSweepThread* th = new ConcurrentMarkSweepThread(collector); | |
| 178 assert(cmst() == th, "Where did the just-created CMS thread go?"); | |
| 179 return th; | |
| 180 } | |
| 181 return NULL; | |
| 182 } | |
| 183 | |
| 184 void ConcurrentMarkSweepThread::stop() { | |
| 185 if (CMSIncrementalMode) { | |
| 186 // Disable incremental mode and wake up the thread so it notices the change. | |
| 187 disable_icms(); | |
| 188 start_icms(); | |
| 189 } | |
| 190 // it is ok to take late safepoints here, if needed | |
| 191 { | |
| 192 MutexLockerEx x(Terminator_lock); | |
| 193 _should_terminate = true; | |
| 194 } | |
| 195 { // Now post a notify on CGC_lock so as to nudge | |
| 196 // CMS thread(s) that might be slumbering in | |
| 197 // sleepBeforeNextCycle. | |
| 198 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
| 199 CGC_lock->notify_all(); | |
| 200 } | |
| 201 { // Now wait until (all) CMS thread(s) have exited | |
| 202 MutexLockerEx x(Terminator_lock); | |
| 203 while(cmst() != NULL) { | |
| 204 Terminator_lock->wait(); | |
| 205 } | |
| 206 } | |
| 207 } | |
| 208 | |
| 209 void ConcurrentMarkSweepThread::threads_do(ThreadClosure* tc) { | |
| 210 assert(tc != NULL, "Null ThreadClosure"); | |
| 211 if (_cmst != NULL) { | |
| 212 tc->do_thread(_cmst); | |
| 213 } | |
| 214 assert(Universe::is_fully_initialized(), | |
| 215 "Called too early, make sure heap is fully initialized"); | |
| 216 if (_collector != NULL) { | |
| 217 AbstractWorkGang* gang = _collector->conc_workers(); | |
| 218 if (gang != NULL) { | |
| 219 gang->threads_do(tc); | |
| 220 } | |
| 221 } | |
| 222 } | |
| 223 | |
| 224 void ConcurrentMarkSweepThread::print_on(outputStream* st) const { | |
| 225 st->print("\"%s\" ", name()); | |
| 226 Thread::print_on(st); | |
| 227 st->cr(); | |
| 228 } | |
| 229 | |
| 230 void ConcurrentMarkSweepThread::print_all_on(outputStream* st) { | |
| 231 if (_cmst != NULL) { | |
| 232 _cmst->print_on(st); | |
| 6766 | 233 st->cr(); |
| 0 | 234 } |
| 235 if (_collector != NULL) { | |
| 236 AbstractWorkGang* gang = _collector->conc_workers(); | |
| 237 if (gang != NULL) { | |
| 238 gang->print_worker_threads_on(st); | |
| 239 } | |
| 240 } | |
| 241 } | |
| 242 | |
| 243 void ConcurrentMarkSweepThread::synchronize(bool is_cms_thread) { | |
| 244 assert(UseConcMarkSweepGC, "just checking"); | |
| 245 | |
| 246 MutexLockerEx x(CGC_lock, | |
| 247 Mutex::_no_safepoint_check_flag); | |
| 248 if (!is_cms_thread) { | |
| 249 assert(Thread::current()->is_VM_thread(), "Not a VM thread"); | |
| 250 CMSSynchronousYieldRequest yr; | |
| 251 while (CMS_flag_is_set(CMS_cms_has_token)) { | |
| 252 // indicate that we want to get the token | |
| 253 set_CMS_flag(CMS_vm_wants_token); | |
| 254 CGC_lock->wait(true); | |
| 255 } | |
| 256 // claim the token and proceed | |
| 257 clear_CMS_flag(CMS_vm_wants_token); | |
| 258 set_CMS_flag(CMS_vm_has_token); | |
| 259 } else { | |
| 260 assert(Thread::current()->is_ConcurrentGC_thread(), | |
| 261 "Not a CMS thread"); | |
| 262 // The following barrier assumes there's only one CMS thread. | |
| 263 // This will need to be modified is there are more CMS threads than one. | |
| 264 while (CMS_flag_is_set(CMS_vm_has_token | CMS_vm_wants_token)) { | |
| 265 set_CMS_flag(CMS_cms_wants_token); | |
| 266 CGC_lock->wait(true); | |
| 267 } | |
| 268 // claim the token | |
| 269 clear_CMS_flag(CMS_cms_wants_token); | |
| 270 set_CMS_flag(CMS_cms_has_token); | |
| 271 } | |
| 272 } | |
| 273 | |
| 274 void ConcurrentMarkSweepThread::desynchronize(bool is_cms_thread) { | |
| 275 assert(UseConcMarkSweepGC, "just checking"); | |
| 276 | |
| 277 MutexLockerEx x(CGC_lock, | |
| 278 Mutex::_no_safepoint_check_flag); | |
| 279 if (!is_cms_thread) { | |
| 280 assert(Thread::current()->is_VM_thread(), "Not a VM thread"); | |
| 281 assert(CMS_flag_is_set(CMS_vm_has_token), "just checking"); | |
| 282 clear_CMS_flag(CMS_vm_has_token); | |
| 283 if (CMS_flag_is_set(CMS_cms_wants_token)) { | |
| 284 // wake-up a waiting CMS thread | |
| 285 CGC_lock->notify(); | |
| 286 } | |
| 287 assert(!CMS_flag_is_set(CMS_vm_has_token | CMS_vm_wants_token), | |
| 288 "Should have been cleared"); | |
| 289 } else { | |
| 290 assert(Thread::current()->is_ConcurrentGC_thread(), | |
| 291 "Not a CMS thread"); | |
| 292 assert(CMS_flag_is_set(CMS_cms_has_token), "just checking"); | |
| 293 clear_CMS_flag(CMS_cms_has_token); | |
| 294 if (CMS_flag_is_set(CMS_vm_wants_token)) { | |
| 295 // wake-up a waiting VM thread | |
| 296 CGC_lock->notify(); | |
| 297 } | |
| 298 assert(!CMS_flag_is_set(CMS_cms_has_token | CMS_cms_wants_token), | |
| 299 "Should have been cleared"); | |
| 300 } | |
| 301 } | |
| 302 | |
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303 // Wait until any cms_lock event |
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304 void ConcurrentMarkSweepThread::wait_on_cms_lock(long t_millis) { |
| 0 | 305 MutexLockerEx x(CGC_lock, |
| 306 Mutex::_no_safepoint_check_flag); | |
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307 if (_should_terminate || _collector->_full_gc_requested) { |
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308 return; |
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309 } |
| 0 | 310 set_CMS_flag(CMS_cms_wants_token); // to provoke notifies |
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311 CGC_lock->wait(Mutex::_no_safepoint_check_flag, t_millis); |
| 0 | 312 clear_CMS_flag(CMS_cms_wants_token); |
| 313 assert(!CMS_flag_is_set(CMS_cms_has_token | CMS_cms_wants_token), | |
| 314 "Should not be set"); | |
| 315 } | |
| 316 | |
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317 // Wait until the next synchronous GC, a concurrent full gc request, |
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318 // or a timeout, whichever is earlier. |
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319 void ConcurrentMarkSweepThread::wait_on_cms_lock_for_scavenge(long t_millis) { |
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320 // Wait time in millis or 0 value representing infinite wait for a scavenge |
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321 assert(t_millis >= 0, "Wait time for scavenge should be 0 or positive"); |
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322 |
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323 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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324 double start_time_secs = os::elapsedTime(); |
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325 double end_time_secs = start_time_secs + (t_millis / ((double) MILLIUNITS)); |
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326 |
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327 // Total collections count before waiting loop |
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328 unsigned int before_count; |
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329 { |
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330 MutexLockerEx hl(Heap_lock, Mutex::_no_safepoint_check_flag); |
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331 before_count = gch->total_collections(); |
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332 } |
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333 |
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334 unsigned int loop_count = 0; |
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335 |
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336 while(!_should_terminate) { |
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337 double now_time = os::elapsedTime(); |
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338 long wait_time_millis; |
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339 |
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340 if(t_millis != 0) { |
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341 // New wait limit |
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342 wait_time_millis = (long) ((end_time_secs - now_time) * MILLIUNITS); |
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343 if(wait_time_millis <= 0) { |
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344 // Wait time is over |
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345 break; |
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346 } |
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347 } else { |
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348 // No wait limit, wait if necessary forever |
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349 wait_time_millis = 0; |
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350 } |
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351 |
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352 // Wait until the next event or the remaining timeout |
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353 { |
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354 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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355 |
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356 if (_should_terminate || _collector->_full_gc_requested) { |
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357 return; |
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358 } |
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359 set_CMS_flag(CMS_cms_wants_token); // to provoke notifies |
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360 assert(t_millis == 0 || wait_time_millis > 0, "Sanity"); |
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361 CGC_lock->wait(Mutex::_no_safepoint_check_flag, wait_time_millis); |
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362 clear_CMS_flag(CMS_cms_wants_token); |
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363 assert(!CMS_flag_is_set(CMS_cms_has_token | CMS_cms_wants_token), |
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364 "Should not be set"); |
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365 } |
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366 |
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367 // Extra wait time check before entering the heap lock to get the collection count |
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368 if(t_millis != 0 && os::elapsedTime() >= end_time_secs) { |
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369 // Wait time is over |
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370 break; |
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371 } |
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372 |
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373 // Total collections count after the event |
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374 unsigned int after_count; |
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375 { |
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376 MutexLockerEx hl(Heap_lock, Mutex::_no_safepoint_check_flag); |
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377 after_count = gch->total_collections(); |
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378 } |
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379 |
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380 if(before_count != after_count) { |
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381 // There was a collection - success |
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382 break; |
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383 } |
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384 |
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385 // Too many loops warning |
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386 if(++loop_count == 0) { |
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387 warning("wait_on_cms_lock_for_scavenge() has looped %u times", loop_count - 1); |
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388 } |
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389 } |
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390 } |
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391 |
| 0 | 392 void ConcurrentMarkSweepThread::sleepBeforeNextCycle() { |
| 393 while (!_should_terminate) { | |
| 394 if (CMSIncrementalMode) { | |
| 395 icms_wait(); | |
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396 if(CMSWaitDuration >= 0) { |
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397 // Wait until the next synchronous GC, a concurrent full gc |
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398 // request or a timeout, whichever is earlier. |
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399 wait_on_cms_lock_for_scavenge(CMSWaitDuration); |
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400 } |
| 0 | 401 return; |
| 402 } else { | |
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403 if(CMSWaitDuration >= 0) { |
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404 // Wait until the next synchronous GC, a concurrent full gc |
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405 // request or a timeout, whichever is earlier. |
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406 wait_on_cms_lock_for_scavenge(CMSWaitDuration); |
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407 } else { |
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408 // Wait until any cms_lock event or check interval not to call shouldConcurrentCollect permanently |
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409 wait_on_cms_lock(CMSCheckInterval); |
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410 } |
| 0 | 411 } |
| 412 // Check if we should start a CMS collection cycle | |
| 413 if (_collector->shouldConcurrentCollect()) { | |
| 414 return; | |
| 415 } | |
| 416 // .. collection criterion not yet met, let's go back | |
| 417 // and wait some more | |
| 418 } | |
| 419 } | |
| 420 | |
| 421 // Incremental CMS | |
| 422 void ConcurrentMarkSweepThread::start_icms() { | |
| 423 assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking"); | |
| 424 MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag); | |
| 425 trace_state("start_icms"); | |
| 426 _should_run = true; | |
| 427 iCMS_lock->notify_all(); | |
| 428 } | |
| 429 | |
| 430 void ConcurrentMarkSweepThread::stop_icms() { | |
| 431 assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking"); | |
| 432 MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag); | |
| 433 if (!_should_stop) { | |
| 434 trace_state("stop_icms"); | |
| 435 _should_stop = true; | |
| 436 _should_run = false; | |
| 437 asynchronous_yield_request(); | |
| 438 iCMS_lock->notify_all(); | |
| 439 } | |
| 440 } | |
| 441 | |
| 442 void ConcurrentMarkSweepThread::icms_wait() { | |
| 443 assert(UseConcMarkSweepGC && CMSIncrementalMode, "just checking"); | |
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444 if (_should_stop && icms_is_enabled()) { |
| 0 | 445 MutexLockerEx x(iCMS_lock, Mutex::_no_safepoint_check_flag); |
| 446 trace_state("pause_icms"); | |
| 447 _collector->stats().stop_cms_timer(); | |
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448 while(!_should_run && icms_is_enabled()) { |
| 0 | 449 iCMS_lock->wait(Mutex::_no_safepoint_check_flag); |
| 450 } | |
| 451 _collector->stats().start_cms_timer(); | |
| 452 _should_stop = false; | |
| 453 trace_state("pause_icms end"); | |
| 454 } | |
| 455 } | |
| 456 | |
| 457 // Note: this method, although exported by the ConcurrentMarkSweepThread, | |
| 458 // which is a non-JavaThread, can only be called by a JavaThread. | |
| 459 // Currently this is done at vm creation time (post-vm-init) by the | |
| 460 // main/Primordial (Java)Thread. | |
| 461 // XXX Consider changing this in the future to allow the CMS thread | |
| 462 // itself to create this thread? | |
| 463 void ConcurrentMarkSweepThread::makeSurrogateLockerThread(TRAPS) { | |
| 464 assert(UseConcMarkSweepGC, "SLT thread needed only for CMS GC"); | |
| 465 assert(_slt == NULL, "SLT already created"); | |
| 466 _slt = SurrogateLockerThread::make(THREAD); | |
| 467 } |