1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "compiler/compiler_globals.hpp"
27 #include "gc/shared/gc_globals.hpp"
28 #include "logging/log.hpp"
29 #include "logging/logStream.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "memory/universe.hpp"
32 #include "runtime/java.hpp"
33 #include "runtime/javaThread.hpp"
34 #include "runtime/mutexLocker.hpp"
35 #include "runtime/safepoint.hpp"
36 #include "runtime/vmThread.hpp"
37 #include "services/management.hpp"
38 #include "utilities/vmError.hpp"
39
40 // Mutexes used in the VM (see comment in mutexLocker.hpp):
41
42 Mutex* Patching_lock = nullptr;
43 Mutex* NMethodState_lock = nullptr;
44 Monitor* SystemDictionary_lock = nullptr;
45 Mutex* InvokeMethodTypeTable_lock = nullptr;
46 Monitor* InvokeMethodIntrinsicTable_lock = nullptr;
47 Mutex* SharedDictionary_lock = nullptr;
48 Monitor* ClassInitError_lock = nullptr;
49 Mutex* Module_lock = nullptr;
50 Mutex* CompiledIC_lock = nullptr;
51 Mutex* InlineCacheBuffer_lock = nullptr;
52 Mutex* VMStatistic_lock = nullptr;
53 Mutex* JmethodIdCreation_lock = nullptr;
54 Mutex* JfieldIdCreation_lock = nullptr;
55 Monitor* JNICritical_lock = nullptr;
56 Mutex* JvmtiThreadState_lock = nullptr;
57 Monitor* EscapeBarrier_lock = nullptr;
58 Monitor* JvmtiVTMSTransition_lock = nullptr;
59 Monitor* Heap_lock = nullptr;
60 #ifdef INCLUDE_PARALLELGC
61 Mutex* PSOldGenExpand_lock = nullptr;
62 #endif
63 Mutex* AdapterHandlerLibrary_lock = nullptr;
64 Mutex* SignatureHandlerLibrary_lock = nullptr;
65 Mutex* VtableStubs_lock = nullptr;
66 Mutex* SymbolArena_lock = nullptr;
67 Monitor* StringDedup_lock = nullptr;
68 Mutex* StringDedupIntern_lock = nullptr;
69 Monitor* CodeCache_lock = nullptr;
70 Mutex* TouchedMethodLog_lock = nullptr;
71 Mutex* RetData_lock = nullptr;
72 Monitor* VMOperation_lock = nullptr;
73 Monitor* Threads_lock = nullptr;
74 Mutex* NonJavaThreadsList_lock = nullptr;
75 Mutex* NonJavaThreadsListSync_lock = nullptr;
76 Monitor* CGC_lock = nullptr;
77 Monitor* STS_lock = nullptr;
78 Monitor* G1OldGCCount_lock = nullptr;
79 Mutex* G1RareEvent_lock = nullptr;
80 Mutex* G1DetachedRefinementStats_lock = nullptr;
81 Mutex* MarkStackFreeList_lock = nullptr;
82 Mutex* MarkStackChunkList_lock = nullptr;
83 Mutex* MonitoringSupport_lock = nullptr;
84 Monitor* ConcurrentGCBreakpoints_lock = nullptr;
85 Mutex* Compile_lock = nullptr;
86 Monitor* MethodCompileQueue_lock = nullptr;
87 Monitor* MethodCompileQueueC1_lock = nullptr;
88 Monitor* MethodCompileQueueC2_lock = nullptr;
89 Monitor* MethodCompileQueueC3_lock = nullptr;
90 Monitor* MethodCompileQueueSC1_lock = nullptr;
91 Monitor* MethodCompileQueueSC2_lock = nullptr;
92 Monitor* CompileThread_lock = nullptr;
93 Monitor* Compilation_lock = nullptr;
94 Mutex* CompileTaskAlloc_lock = nullptr;
95 Mutex* CompileStatistics_lock = nullptr;
96 Mutex* DirectivesStack_lock = nullptr;
97 Monitor* Terminator_lock = nullptr;
98 Monitor* InitCompleted_lock = nullptr;
99 Monitor* BeforeExit_lock = nullptr;
100 Monitor* Notify_lock = nullptr;
101 Mutex* ExceptionCache_lock = nullptr;
102 Mutex* TrainingData_lock = nullptr;
103 Monitor* TrainingReplayQueue_lock = nullptr;
104 #ifndef PRODUCT
105 Mutex* FullGCALot_lock = nullptr;
106 #endif
107
108 Mutex* tty_lock = nullptr;
109
110 Mutex* RawMonitor_lock = nullptr;
111 Mutex* PerfDataMemAlloc_lock = nullptr;
112 Mutex* PerfDataManager_lock = nullptr;
113
114 Mutex* FreeList_lock = nullptr;
115 Mutex* OldSets_lock = nullptr;
116 Mutex* Uncommit_lock = nullptr;
117 Monitor* RootRegionScan_lock = nullptr;
118
119 Mutex* Management_lock = nullptr;
120 Monitor* MonitorDeflation_lock = nullptr;
121 Monitor* Service_lock = nullptr;
122 Monitor* Notification_lock = nullptr;
123 Monitor* PeriodicTask_lock = nullptr;
124 Monitor* RedefineClasses_lock = nullptr;
125 Mutex* Verify_lock = nullptr;
126
127 #if INCLUDE_JFR
128 Mutex* JfrStacktrace_lock = nullptr;
129 Monitor* JfrMsg_lock = nullptr;
130 Mutex* JfrBuffer_lock = nullptr;
131 Monitor* JfrThreadSampler_lock = nullptr;
132 #endif
133
134 Mutex* CodeHeapStateAnalytics_lock = nullptr;
135
136 Monitor* ContinuationRelativize_lock = nullptr;
137
138 Mutex* Metaspace_lock = nullptr;
139 Monitor* MetaspaceCritical_lock = nullptr;
140 Mutex* ClassLoaderDataGraph_lock = nullptr;
141 Monitor* ThreadsSMRDelete_lock = nullptr;
142 Mutex* ThreadIdTableCreate_lock = nullptr;
143 Mutex* SharedDecoder_lock = nullptr;
144 Mutex* DCmdFactory_lock = nullptr;
145 Mutex* NMTQuery_lock = nullptr;
146 Mutex* NMTCompilationCostHistory_lock = nullptr;
147
148 #if INCLUDE_CDS
149 #if INCLUDE_JVMTI
150 Mutex* CDSClassFileStream_lock = nullptr;
151 #endif
152 Mutex* DumpTimeTable_lock = nullptr;
153 Mutex* CDSLambda_lock = nullptr;
154 Mutex* DumpRegion_lock = nullptr;
155 Mutex* ClassListFile_lock = nullptr;
156 Mutex* UnregisteredClassesTable_lock= nullptr;
157 Mutex* LambdaFormInvokers_lock = nullptr;
158 Mutex* ScratchObjects_lock = nullptr;
159 Mutex* ArchivedObjectTables_lock = nullptr;
160 #endif // INCLUDE_CDS
161 Mutex* Bootclasspath_lock = nullptr;
162
163 #if INCLUDE_JVMCI
164 Monitor* JVMCI_lock = nullptr;
165 Monitor* JVMCIRuntime_lock = nullptr;
166 #endif
167
168 // Only one RecursiveMutex
169 RecursiveMutex* MultiArray_lock = nullptr;
170
171 #define MAX_NUM_MUTEX 128
172 static Mutex* _mutex_array[MAX_NUM_MUTEX];
173 static int _num_mutex;
174
175 #ifdef ASSERT
176 void assert_locked_or_safepoint(const Mutex* lock) {
177 if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return;
178 // check if this thread owns the lock (common case)
179 assert(lock != nullptr, "Need non-null lock");
180 if (lock->owned_by_self()) return;
181 if (SafepointSynchronize::is_at_safepoint()) return;
182 if (!Universe::is_fully_initialized()) return;
183 fatal("must own lock %s", lock->name());
184 }
185
186 // a stronger assertion than the above
187 void assert_lock_strong(const Mutex* lock) {
188 if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return;
189 assert(lock != nullptr, "Need non-null lock");
190 if (lock->owned_by_self()) return;
191 fatal("must own lock %s", lock->name());
192 }
193 #endif
194
195 static void add_mutex(Mutex* var) {
196 assert(_num_mutex < MAX_NUM_MUTEX, "increase MAX_NUM_MUTEX");
197 int id = _num_mutex++;
198 _mutex_array[id] = var;
199 // var->set_id(id);
200 }
201
202 #define MUTEX_STORAGE_NAME(name) name##_storage
203 #define MUTEX_STORAGE(name, type) alignas(type) static uint8_t MUTEX_STORAGE_NAME(name)[sizeof(type)]
204 #define MUTEX_DEF(name, type, pri, ...) { \
205 assert(name == nullptr, "Mutex/Monitor initialized twice"); \
206 MUTEX_STORAGE(name, type); \
207 name = ::new(static_cast<void*>(MUTEX_STORAGE_NAME(name))) type((pri), #name, ##__VA_ARGS__); \
208 add_mutex(name); \
209 }
210 #define MUTEX_DEFN(name, type, pri, ...) MUTEX_DEF(name, type, Mutex::pri, ##__VA_ARGS__)
211
212 // Specify relative ranked lock
213 #ifdef ASSERT
214 #define MUTEX_DEFL(name, type, held_lock, ...) MUTEX_DEF(name, type, (held_lock)->rank() - 1, ##__VA_ARGS__)
215 #else
216 #define MUTEX_DEFL(name, type, held_lock, ...) MUTEX_DEFN(name, type, safepoint, ##__VA_ARGS__)
217 #endif
218
219 // Using Padded subclasses to prevent false sharing of these global monitors and mutexes.
220 void mutex_init() {
221 MUTEX_DEFN(tty_lock , PaddedMutex , tty); // allow to lock in VM
222
223 MUTEX_DEFN(STS_lock , PaddedMonitor, nosafepoint);
224
225 if (UseG1GC) {
226 MUTEX_DEFN(CGC_lock , PaddedMonitor, nosafepoint);
227
228 MUTEX_DEFN(G1DetachedRefinementStats_lock, PaddedMutex , nosafepoint-2);
229
230 MUTEX_DEFN(FreeList_lock , PaddedMutex , service-1);
231 MUTEX_DEFN(OldSets_lock , PaddedMutex , nosafepoint);
232 MUTEX_DEFN(Uncommit_lock , PaddedMutex , service-2);
233 MUTEX_DEFN(RootRegionScan_lock , PaddedMonitor, nosafepoint-1);
234
235 MUTEX_DEFN(MarkStackFreeList_lock , PaddedMutex , nosafepoint);
236 MUTEX_DEFN(MarkStackChunkList_lock , PaddedMutex , nosafepoint);
237 }
238 MUTEX_DEFN(MonitoringSupport_lock , PaddedMutex , service-1); // used for serviceability monitoring support
239
240 MUTEX_DEFN(StringDedup_lock , PaddedMonitor, nosafepoint);
241 MUTEX_DEFN(StringDedupIntern_lock , PaddedMutex , nosafepoint);
242 MUTEX_DEFN(RawMonitor_lock , PaddedMutex , nosafepoint-1);
243
244 MUTEX_DEFN(Metaspace_lock , PaddedMutex , nosafepoint-3);
245 MUTEX_DEFN(MetaspaceCritical_lock , PaddedMonitor, nosafepoint-1);
246
247 MUTEX_DEFN(Patching_lock , PaddedMutex , nosafepoint); // used for safepointing and code patching.
248 MUTEX_DEFN(MonitorDeflation_lock , PaddedMonitor, nosafepoint); // used for monitor deflation thread operations
249 MUTEX_DEFN(Service_lock , PaddedMonitor, service); // used for service thread operations
250
251 if (UseNotificationThread) {
252 MUTEX_DEFN(Notification_lock , PaddedMonitor, service); // used for notification thread operations
253 } else {
254 Notification_lock = Service_lock;
255 }
256
257 MUTEX_DEFN(JmethodIdCreation_lock , PaddedMutex , nosafepoint-2); // used for creating jmethodIDs.
258 MUTEX_DEFN(InvokeMethodTypeTable_lock , PaddedMutex , safepoint);
259 MUTEX_DEFN(InvokeMethodIntrinsicTable_lock , PaddedMonitor, safepoint);
260 MUTEX_DEFN(AdapterHandlerLibrary_lock , PaddedMutex , safepoint);
261 MUTEX_DEFN(SharedDictionary_lock , PaddedMutex , safepoint);
262 MUTEX_DEFN(VMStatistic_lock , PaddedMutex , safepoint);
263 MUTEX_DEFN(SignatureHandlerLibrary_lock , PaddedMutex , safepoint);
264 MUTEX_DEFN(SymbolArena_lock , PaddedMutex , nosafepoint);
265 MUTEX_DEFN(ExceptionCache_lock , PaddedMutex , safepoint);
266 #ifndef PRODUCT
267 MUTEX_DEFN(FullGCALot_lock , PaddedMutex , safepoint); // a lock to make FullGCALot MT safe
268 #endif
269 MUTEX_DEFN(BeforeExit_lock , PaddedMonitor, safepoint);
270
271 MUTEX_DEFN(NonJavaThreadsList_lock , PaddedMutex , nosafepoint-1);
272 MUTEX_DEFN(NonJavaThreadsListSync_lock , PaddedMutex , nosafepoint);
273
274 MUTEX_DEFN(RetData_lock , PaddedMutex , safepoint);
275 MUTEX_DEFN(Terminator_lock , PaddedMonitor, safepoint, true);
276 MUTEX_DEFN(InitCompleted_lock , PaddedMonitor, nosafepoint);
277 MUTEX_DEFN(Notify_lock , PaddedMonitor, safepoint, true);
278
279 MUTEX_DEFN(JfieldIdCreation_lock , PaddedMutex , safepoint);
280
281 MUTEX_DEFN(CompiledIC_lock , PaddedMutex , nosafepoint); // locks VtableStubs_lock, InlineCacheBuffer_lock
282 MUTEX_DEFN(MethodCompileQueue_lock , PaddedMonitor, safepoint);
283 if (UseGlobalCompileQueueLock) {
284 MethodCompileQueueC1_lock = MethodCompileQueue_lock;
285 MethodCompileQueueC2_lock = MethodCompileQueue_lock;
286 MethodCompileQueueC3_lock = MethodCompileQueue_lock;
287 MethodCompileQueueSC1_lock = MethodCompileQueue_lock;
288 MethodCompileQueueSC2_lock = MethodCompileQueue_lock;
289 } else {
290 MUTEX_DEFN(MethodCompileQueueC1_lock , PaddedMonitor, safepoint);
291 MUTEX_DEFN(MethodCompileQueueC2_lock , PaddedMonitor, safepoint);
292 MUTEX_DEFN(MethodCompileQueueC3_lock , PaddedMonitor, safepoint);
293 MUTEX_DEFN(MethodCompileQueueSC1_lock , PaddedMonitor, safepoint);
294 MUTEX_DEFN(MethodCompileQueueSC2_lock , PaddedMonitor, safepoint);
295 }
296 MUTEX_DEFL(TrainingData_lock , PaddedMutex , MethodCompileQueue_lock);
297 MUTEX_DEFN(TrainingReplayQueue_lock , PaddedMonitor, safepoint);
298 MUTEX_DEFN(CompileStatistics_lock , PaddedMutex , safepoint);
299 MUTEX_DEFN(DirectivesStack_lock , PaddedMutex , nosafepoint);
300
301 MUTEX_DEFN(JvmtiThreadState_lock , PaddedMutex , safepoint); // Used by JvmtiThreadState/JvmtiEventController
302 MUTEX_DEFN(EscapeBarrier_lock , PaddedMonitor, nosafepoint); // Used to synchronize object reallocation/relocking triggered by JVMTI
303 MUTEX_DEFN(JvmtiVTMSTransition_lock , PaddedMonitor, safepoint); // used for Virtual Thread Mount State transition management
304 MUTEX_DEFN(Management_lock , PaddedMutex , safepoint); // used for JVM management
305
306 MUTEX_DEFN(ConcurrentGCBreakpoints_lock , PaddedMonitor, safepoint, true);
307 MUTEX_DEFN(TouchedMethodLog_lock , PaddedMutex , safepoint);
308
309 MUTEX_DEFN(CompileThread_lock , PaddedMonitor, safepoint);
310 MUTEX_DEFN(PeriodicTask_lock , PaddedMonitor, safepoint, true);
311 MUTEX_DEFN(RedefineClasses_lock , PaddedMonitor, safepoint);
312 MUTEX_DEFN(Verify_lock , PaddedMutex , safepoint);
313 MUTEX_DEFN(ClassLoaderDataGraph_lock , PaddedMutex , safepoint);
314
315 MUTEX_DEFN(Compilation_lock , PaddedMonitor, nosafepoint);
316
317 #if INCLUDE_JFR
318 MUTEX_DEFN(JfrBuffer_lock , PaddedMutex , event);
319 MUTEX_DEFN(JfrMsg_lock , PaddedMonitor, event);
320 MUTEX_DEFN(JfrStacktrace_lock , PaddedMutex , event);
321 MUTEX_DEFN(JfrThreadSampler_lock , PaddedMonitor, nosafepoint);
322 #endif
323
324 MUTEX_DEFN(ContinuationRelativize_lock , PaddedMonitor, nosafepoint-3);
325 MUTEX_DEFN(CodeHeapStateAnalytics_lock , PaddedMutex , safepoint);
326 MUTEX_DEFN(ThreadsSMRDelete_lock , PaddedMonitor, service-2); // Holds ConcurrentHashTableResize_lock
327 MUTEX_DEFN(ThreadIdTableCreate_lock , PaddedMutex , safepoint);
328 MUTEX_DEFN(SharedDecoder_lock , PaddedMutex , tty-1);
329 MUTEX_DEFN(DCmdFactory_lock , PaddedMutex , nosafepoint);
330 MUTEX_DEFN(NMTQuery_lock , PaddedMutex , safepoint);
331 MUTEX_DEFN(NMTCompilationCostHistory_lock , PaddedMutex , nosafepoint);
332 #if INCLUDE_CDS
333 #if INCLUDE_JVMTI
334 MUTEX_DEFN(CDSClassFileStream_lock , PaddedMutex , safepoint);
335 #endif
336 MUTEX_DEFN(DumpTimeTable_lock , PaddedMutex , nosafepoint);
337 MUTEX_DEFN(CDSLambda_lock , PaddedMutex , nosafepoint);
338 MUTEX_DEFN(DumpRegion_lock , PaddedMutex , nosafepoint);
339 MUTEX_DEFN(ClassListFile_lock , PaddedMutex , nosafepoint);
340 MUTEX_DEFN(UnregisteredClassesTable_lock , PaddedMutex , nosafepoint-1);
341 MUTEX_DEFN(LambdaFormInvokers_lock , PaddedMutex , safepoint);
342 MUTEX_DEFN(ScratchObjects_lock , PaddedMutex , nosafepoint-1); // Holds DumpTimeTable_lock
343 MUTEX_DEFN(ArchivedObjectTables_lock , PaddedMutex , nosafepoint);
344 #endif // INCLUDE_CDS
345 MUTEX_DEFN(Bootclasspath_lock , PaddedMutex , nosafepoint);
346
347 #if INCLUDE_JVMCI
348 // JVMCIRuntime::_lock must be acquired before JVMCI_lock to avoid deadlock
349 MUTEX_DEFN(JVMCIRuntime_lock , PaddedMonitor, safepoint, true);
350 #endif
351
352 // These locks have relative rankings, and inherit safepoint checking attributes from that rank.
353 MUTEX_DEFL(InlineCacheBuffer_lock , PaddedMutex , CompiledIC_lock);
354 MUTEX_DEFL(VtableStubs_lock , PaddedMutex , CompiledIC_lock); // Also holds DumpTimeTable_lock
355 MUTEX_DEFL(CodeCache_lock , PaddedMonitor, VtableStubs_lock);
356 MUTEX_DEFL(NMethodState_lock , PaddedMutex , CodeCache_lock);
357
358 MUTEX_DEFL(Threads_lock , PaddedMonitor, CompileThread_lock, true);
359 MUTEX_DEFL(Compile_lock , PaddedMutex , MethodCompileQueue_lock);
360 MUTEX_DEFL(Heap_lock , PaddedMonitor, TrainingData_lock /*AdapterHandlerLibrary_lock*/);
361
362 MUTEX_DEFL(PerfDataMemAlloc_lock , PaddedMutex , Heap_lock);
363 MUTEX_DEFL(PerfDataManager_lock , PaddedMutex , Heap_lock);
364 MUTEX_DEFL(VMOperation_lock , PaddedMonitor, Heap_lock, true);
365 MUTEX_DEFL(ClassInitError_lock , PaddedMonitor, Threads_lock);
366
367 if (UseG1GC) {
368 MUTEX_DEFL(G1OldGCCount_lock , PaddedMonitor, Threads_lock, true);
369 MUTEX_DEFL(G1RareEvent_lock , PaddedMutex , Threads_lock, true);
370 }
371
372 MUTEX_DEFL(CompileTaskAlloc_lock , PaddedMutex , MethodCompileQueue_lock);
373 #ifdef INCLUDE_PARALLELGC
374 if (UseParallelGC) {
375 MUTEX_DEFL(PSOldGenExpand_lock , PaddedMutex , Heap_lock, true);
376 }
377 #endif
378 MUTEX_DEFL(Module_lock , PaddedMutex , ClassLoaderDataGraph_lock);
379 MUTEX_DEFL(SystemDictionary_lock , PaddedMonitor, Module_lock);
380 MUTEX_DEFL(JNICritical_lock , PaddedMonitor, AdapterHandlerLibrary_lock); // used for JNI critical regions
381 #if INCLUDE_JVMCI
382 // JVMCIRuntime_lock must be acquired before JVMCI_lock to avoid deadlock
383 MUTEX_DEFL(JVMCI_lock , PaddedMonitor, JVMCIRuntime_lock);
384 #endif
385
386 // Allocate RecursiveMutex
387 MultiArray_lock = new RecursiveMutex();
388 }
389
390 #undef MUTEX_DEFL
391 #undef MUTEX_DEFN
392 #undef MUTEX_DEF
393 #undef MUTEX_STORAGE
394 #undef MUTEX_STORAGE_NAME
395
396 static const int MAX_NAMES = 200;
397 static const char* _names[MAX_NAMES] = { nullptr };
398 static bool _is_unique[MAX_NAMES] = { false };
399 static int _num_names = 0;
400
401 PerfCounter** MutexLockerImpl::_perf_lock_count = nullptr;
402 PerfCounter** MutexLockerImpl::_perf_lock_wait_time = nullptr;
403 PerfCounter** MutexLockerImpl::_perf_lock_hold_time = nullptr;
404
405 void MutexLockerImpl::init_counters() {
406 if (ProfileVMLocks && UsePerfData) {
407 ResourceMark rm;
408 EXCEPTION_MARK;
409 _perf_lock_count = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
410 _perf_lock_wait_time = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
411 _perf_lock_hold_time = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
412
413 NEWPERFEVENTCOUNTER(_perf_lock_count[0], SUN_RT, PerfDataManager::counter_name("Other", "Count"));
414 NEWPERFEVENTCOUNTER(_perf_lock_wait_time[0], SUN_RT, PerfDataManager::counter_name("Other", "BeforeTime"));
415 NEWPERFEVENTCOUNTER(_perf_lock_hold_time[0], SUN_RT, PerfDataManager::counter_name("Other", "AfterTime"));
416 for (int i = 0; i < MAX_NAMES; i++) {
417 ResourceMark rm;
418 const char* counter_name = _names[i];
419 if (counter_name == nullptr) {
420 stringStream ss;
421 ss.print("UnnamedMutex#%d", i);
422 counter_name = ss.as_string();
423 }
424 NEWPERFEVENTCOUNTER(_perf_lock_count[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "Count"));
425 NEWPERFEVENTCOUNTER(_perf_lock_wait_time[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "BeforeTime"));
426 NEWPERFEVENTCOUNTER(_perf_lock_hold_time[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "AfterTime"));
427 }
428 if (HAS_PENDING_EXCEPTION) {
429 vm_exit_during_initialization("MutexLockerImpl::init_counters() failed unexpectedly");
430 }
431 }
432 }
433
434 int MutexLockerImpl::name2id(const char* name) {
435 if (ProfileVMLocks && UsePerfData) {
436 for (int i = 0; i < _num_names; i++) {
437 if (strcmp(_names[i], name) == 0) {
438 _is_unique[i] = false;
439 return i;
440 }
441 }
442 if (_num_names < MAX_NAMES) {
443 int new_id = _num_names++;
444 _names[new_id] = os::strdup(name, mtInternal);
445 _is_unique[new_id] = true;
446 return new_id;
447 }
448 log_debug(init)("Unnamed: %s", name); // no slots left
449 }
450 return -1;
451 }
452
453 void MutexLockerImpl::print_counter_on(outputStream* st, const char* name, bool is_unique, int idx) {
454 jlong count = _perf_lock_count[idx]->get_value();
455 if (count > 0) {
456 st->print_cr(" %3d: %s%40s = %5ldms (%5ldms) / %9ld events", idx, (is_unique ? " " : "M"), name,
457 Management::ticks_to_ms(_perf_lock_hold_time[idx]->get_value()),
458 Management::ticks_to_ms(_perf_lock_wait_time[idx]->get_value()),
459 count);
460 }
461 }
462
463 static jlong accumulate_lock_counters(PerfCounter** lock_counters) {
464 jlong acc = 0;
465 for (int i = 0; i < _num_names + 1; i++) { // 0 slot is reserved for unnamed locks
466 if (lock_counters[i] == nullptr) {
467 break;
468 }
469 acc += lock_counters[i]->get_value();
470 }
471 return acc;
472 }
473
474 void MutexLockerImpl::print_counters_on(outputStream* st) {
475 if (ProfileVMLocks && UsePerfData) {
476 jlong total_count = accumulate_lock_counters(_perf_lock_count);
477 jlong total_wait_time = accumulate_lock_counters(_perf_lock_wait_time);
478 jlong total_hold_time = accumulate_lock_counters(_perf_lock_hold_time);
479
480 st->print_cr("MutexLocker: Total: %d named locks (%d unique names); hold = %ldms (wait = %ldms) / %ld events for thread \"main\"",
481 _num_mutex, _num_names,
482 Management::ticks_to_ms(total_hold_time),
483 Management::ticks_to_ms(total_wait_time),
484 total_count);
485 for (int i = 0; i < _num_names; i++) {
486 print_counter_on(st, _names[i], _is_unique[i], i+1);
487 }
488 print_counter_on(st, "Unnamed / Other", false /*is_unique*/, 0);
489 } else {
490 st->print_cr("MutexLocker: no info (%s is disabled)", (UsePerfData ? "ProfileVMLocks" : "UsePerfData"));
491 }
492 }
493
494 void MutexLockerImpl::post_initialize() {
495 // Print mutex ranks if requested.
496 LogTarget(Info, vmmutex) lt;
497 if (lt.is_enabled()) {
498 ResourceMark rm;
499 LogStream ls(lt);
500 print_lock_ranks(&ls);
501 }
502 }
503
504 GCMutexLocker::GCMutexLocker(Mutex* mutex) {
505 if (SafepointSynchronize::is_at_safepoint()) {
506 _locked = false;
507 } else {
508 _mutex = mutex;
509 _locked = true;
510 _mutex->lock();
511 }
512 }
513
514 // Print all mutexes/monitors that are currently owned by a thread; called
515 // by fatal error handler.
516 void print_owned_locks_on_error(outputStream* st) {
517 st->print("VM Mutex/Monitor currently owned by a thread: ");
518 bool none = true;
519 for (int i = 0; i < _num_mutex; i++) {
520 // see if it has an owner
521 if (_mutex_array[i]->owner() != nullptr) {
522 if (none) {
523 // print format used by Mutex::print_on_error()
524 st->print_cr(" ([mutex/lock_event])");
525 none = false;
526 }
527 _mutex_array[i]->print_on_error(st);
528 st->cr();
529 }
530 }
531 if (none) st->print_cr("None");
532 }
533
534 void print_lock_ranks(outputStream* st) {
535 st->print_cr("VM Mutex/Monitor ranks: ");
536
537 #ifdef ASSERT
538 // Be extra defensive and figure out the bounds on
539 // ranks right here. This also saves a bit of time
540 // in the #ranks*#mutexes loop below.
541 int min_rank = INT_MAX;
542 int max_rank = INT_MIN;
543 for (int i = 0; i < _num_mutex; i++) {
544 Mutex* m = _mutex_array[i];
545 int r = (int) m->rank();
546 if (min_rank > r) min_rank = r;
547 if (max_rank < r) max_rank = r;
548 }
549
550 // Print the listings rank by rank
551 for (int r = min_rank; r <= max_rank; r++) {
552 bool first = true;
553 for (int i = 0; i < _num_mutex; i++) {
554 Mutex* m = _mutex_array[i];
555 if (r != (int) m->rank()) continue;
556
557 if (first) {
558 st->cr();
559 st->print_cr("Rank \"%s\":", m->rank_name());
560 first = false;
561 }
562 st->print_cr(" %s", m->name());
563 }
564 }
565 #else
566 st->print_cr(" Only known in debug builds.");
567 #endif // ASSERT
568 }