Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/concurrentGCThread.cpp @ 10290:05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
Summary: Improve the output of G1PrintRegionLivenessInfo by adding a per-region remembered set size information column
Reviewed-by: jwilhelm, johnc
author | tschatzl |
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date | Thu, 16 May 2013 13:02:33 +0200 |
parents | aed758eda82a |
children | 63a4eb8bcd23 581e70386ec9 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "gc_implementation/shared/concurrentGCThread.hpp" | |
28 #include "oops/instanceRefKlass.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "runtime/init.hpp" | |
31 #include "runtime/interfaceSupport.hpp" | |
32 #include "runtime/java.hpp" | |
33 #include "runtime/javaCalls.hpp" | |
342 | 34 |
1972 | 35 // CopyrightVersion 1.2 |
342 | 36 |
37 int ConcurrentGCThread::_CGC_flag = CGC_nil; | |
38 | |
39 SuspendibleThreadSet ConcurrentGCThread::_sts; | |
40 | |
794 | 41 ConcurrentGCThread::ConcurrentGCThread() : |
42 _should_terminate(false), _has_terminated(false) { | |
342 | 43 _sts.initialize(); |
44 }; | |
45 | |
46 void ConcurrentGCThread::safepoint_synchronize() { | |
47 _sts.suspend_all(); | |
48 } | |
49 | |
50 void ConcurrentGCThread::safepoint_desynchronize() { | |
51 _sts.resume_all(); | |
52 } | |
53 | |
54 void ConcurrentGCThread::create_and_start() { | |
55 if (os::create_thread(this, os::cgc_thread)) { | |
56 // XXX: need to set this to low priority | |
57 // unless "agressive mode" set; priority | |
58 // should be just less than that of VMThread. | |
59 os::set_priority(this, NearMaxPriority); | |
60 if (!_should_terminate && !DisableStartThread) { | |
61 os::start_thread(this); | |
62 } | |
63 } | |
64 } | |
65 | |
66 void ConcurrentGCThread::initialize_in_thread() { | |
67 this->record_stack_base_and_size(); | |
68 this->initialize_thread_local_storage(); | |
69 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
70 // From this time Thread::current() should be working. | |
71 assert(this == Thread::current(), "just checking"); | |
72 } | |
73 | |
74 void ConcurrentGCThread::wait_for_universe_init() { | |
75 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
76 while (!is_init_completed() && !_should_terminate) { | |
77 CGC_lock->wait(Mutex::_no_safepoint_check_flag, 200); | |
78 } | |
79 } | |
80 | |
81 void ConcurrentGCThread::terminate() { | |
82 // Signal that it is terminated | |
83 { | |
84 MutexLockerEx mu(Terminator_lock, | |
85 Mutex::_no_safepoint_check_flag); | |
86 _has_terminated = true; | |
87 Terminator_lock->notify(); | |
88 } | |
89 | |
90 // Thread destructor usually does this.. | |
91 ThreadLocalStorage::set_thread(NULL); | |
92 } | |
93 | |
94 | |
95 void SuspendibleThreadSet::initialize_work() { | |
96 MutexLocker x(STS_init_lock); | |
97 if (!_initialized) { | |
98 _m = new Monitor(Mutex::leaf, | |
99 "SuspendibleThreadSetLock", true); | |
100 _async = 0; | |
101 _async_stop = false; | |
102 _async_stopped = 0; | |
103 _initialized = true; | |
104 } | |
105 } | |
106 | |
107 void SuspendibleThreadSet::join() { | |
108 initialize(); | |
109 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
110 while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag); | |
111 _async++; | |
112 assert(_async > 0, "Huh."); | |
113 } | |
114 | |
115 void SuspendibleThreadSet::leave() { | |
116 assert(_initialized, "Must be initialized."); | |
117 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
118 _async--; | |
119 assert(_async >= 0, "Huh."); | |
120 if (_async_stop) _m->notify_all(); | |
121 } | |
122 | |
123 void SuspendibleThreadSet::yield(const char* id) { | |
124 assert(_initialized, "Must be initialized."); | |
125 if (_async_stop) { | |
126 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
127 if (_async_stop) { | |
128 _async_stopped++; | |
129 assert(_async_stopped > 0, "Huh."); | |
130 if (_async_stopped == _async) { | |
131 if (ConcGCYieldTimeout > 0) { | |
132 double now = os::elapsedTime(); | |
133 guarantee((now - _suspend_all_start) * 1000.0 < | |
134 (double)ConcGCYieldTimeout, | |
135 "Long delay; whodunit?"); | |
136 } | |
137 } | |
138 _m->notify_all(); | |
139 while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag); | |
140 _async_stopped--; | |
141 assert(_async >= 0, "Huh"); | |
142 _m->notify_all(); | |
143 } | |
144 } | |
145 } | |
146 | |
147 void SuspendibleThreadSet::suspend_all() { | |
148 initialize(); // If necessary. | |
149 if (ConcGCYieldTimeout > 0) { | |
150 _suspend_all_start = os::elapsedTime(); | |
151 } | |
152 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
153 assert(!_async_stop, "Only one at a time."); | |
154 _async_stop = true; | |
155 while (_async_stopped < _async) _m->wait(Mutex::_no_safepoint_check_flag); | |
156 } | |
157 | |
158 void SuspendibleThreadSet::resume_all() { | |
159 assert(_initialized, "Must be initialized."); | |
160 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
161 assert(_async_stopped == _async, "Huh."); | |
162 _async_stop = false; | |
163 _m->notify_all(); | |
164 } | |
165 | |
166 static void _sltLoop(JavaThread* thread, TRAPS) { | |
167 SurrogateLockerThread* slt = (SurrogateLockerThread*)thread; | |
168 slt->loop(); | |
169 } | |
170 | |
171 SurrogateLockerThread::SurrogateLockerThread() : | |
172 JavaThread(&_sltLoop), | |
173 _monitor(Mutex::nonleaf, "SLTMonitor"), | |
174 _buffer(empty) | |
175 {} | |
176 | |
177 SurrogateLockerThread* SurrogateLockerThread::make(TRAPS) { | |
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178 Klass* k = |
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179 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), |
342 | 180 true, CHECK_NULL); |
181 instanceKlassHandle klass (THREAD, k); | |
182 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
183 | |
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184 const char thread_name[] = "Surrogate Locker Thread (Concurrent GC)"; |
342 | 185 Handle string = java_lang_String::create_from_str(thread_name, CHECK_NULL); |
186 | |
187 // Initialize thread_oop to put it into the system threadGroup | |
188 Handle thread_group (THREAD, Universe::system_thread_group()); | |
189 JavaValue result(T_VOID); | |
190 JavaCalls::call_special(&result, thread_oop, | |
191 klass, | |
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192 vmSymbols::object_initializer_name(), |
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193 vmSymbols::threadgroup_string_void_signature(), |
342 | 194 thread_group, |
195 string, | |
196 CHECK_NULL); | |
197 | |
198 SurrogateLockerThread* res; | |
199 { | |
200 MutexLocker mu(Threads_lock); | |
201 res = new SurrogateLockerThread(); | |
202 | |
203 // At this point it may be possible that no osthread was created for the | |
204 // JavaThread due to lack of memory. We would have to throw an exception | |
205 // in that case. However, since this must work and we do not allow | |
206 // exceptions anyway, check and abort if this fails. | |
207 if (res == NULL || res->osthread() == NULL) { | |
208 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
209 "unable to create new native thread"); | |
210 } | |
211 java_lang_Thread::set_thread(thread_oop(), res); | |
212 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
213 java_lang_Thread::set_daemon(thread_oop()); | |
214 | |
215 res->set_threadObj(thread_oop()); | |
216 Threads::add(res); | |
217 Thread::start(res); | |
218 } | |
219 os::yield(); // This seems to help with initial start-up of SLT | |
220 return res; | |
221 } | |
222 | |
223 void SurrogateLockerThread::manipulatePLL(SLT_msg_type msg) { | |
224 MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag); | |
225 assert(_buffer == empty, "Should be empty"); | |
226 assert(msg != empty, "empty message"); | |
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227 assert(!Heap_lock->owned_by_self(), "Heap_lock owned by requesting thread"); |
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228 |
342 | 229 _buffer = msg; |
230 while (_buffer != empty) { | |
231 _monitor.notify(); | |
232 _monitor.wait(Mutex::_no_safepoint_check_flag); | |
233 } | |
234 } | |
235 | |
236 // ======= Surrogate Locker Thread ============= | |
237 | |
238 void SurrogateLockerThread::loop() { | |
239 BasicLock pll_basic_lock; | |
240 SLT_msg_type msg; | |
241 debug_only(unsigned int owned = 0;) | |
242 | |
243 while (/* !isTerminated() */ 1) { | |
244 { | |
245 MutexLocker x(&_monitor); | |
246 // Since we are a JavaThread, we can't be here at a safepoint. | |
247 assert(!SafepointSynchronize::is_at_safepoint(), | |
248 "SLT is a JavaThread"); | |
249 // wait for msg buffer to become non-empty | |
250 while (_buffer == empty) { | |
251 _monitor.notify(); | |
252 _monitor.wait(); | |
253 } | |
254 msg = _buffer; | |
255 } | |
256 switch(msg) { | |
257 case acquirePLL: { | |
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258 InstanceRefKlass::acquire_pending_list_lock(&pll_basic_lock); |
342 | 259 debug_only(owned++;) |
260 break; | |
261 } | |
262 case releaseAndNotifyPLL: { | |
263 assert(owned > 0, "Don't have PLL"); | |
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264 InstanceRefKlass::release_and_notify_pending_list_lock(&pll_basic_lock); |
342 | 265 debug_only(owned--;) |
266 break; | |
267 } | |
268 case empty: | |
269 default: { | |
270 guarantee(false,"Unexpected message in _buffer"); | |
271 break; | |
272 } | |
273 } | |
274 { | |
275 MutexLocker x(&_monitor); | |
276 // Since we are a JavaThread, we can't be here at a safepoint. | |
277 assert(!SafepointSynchronize::is_at_safepoint(), | |
278 "SLT is a JavaThread"); | |
279 _buffer = empty; | |
280 _monitor.notify(); | |
281 } | |
282 } | |
283 assert(!_monitor.owned_by_self(), "Should unlock before exit."); | |
284 } | |
285 | |
286 | |
287 // ===== STS Access From Outside CGCT ===== | |
288 | |
289 void ConcurrentGCThread::stsYield(const char* id) { | |
290 assert( Thread::current()->is_ConcurrentGC_thread(), | |
291 "only a conc GC thread can call this" ); | |
292 _sts.yield(id); | |
293 } | |
294 | |
295 bool ConcurrentGCThread::stsShouldYield() { | |
296 assert( Thread::current()->is_ConcurrentGC_thread(), | |
297 "only a conc GC thread can call this" ); | |
298 return _sts.should_yield(); | |
299 } | |
300 | |
301 void ConcurrentGCThread::stsJoin() { | |
302 assert( Thread::current()->is_ConcurrentGC_thread(), | |
303 "only a conc GC thread can call this" ); | |
304 _sts.join(); | |
305 } | |
306 | |
307 void ConcurrentGCThread::stsLeave() { | |
308 assert( Thread::current()->is_ConcurrentGC_thread(), | |
309 "only a conc GC thread can call this" ); | |
310 _sts.leave(); | |
311 } |