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* NMethodState_lock = nullptr;
43 Monitor* SystemDictionary_lock = nullptr;
44 Mutex* InvokeMethodTypeTable_lock = nullptr;
45 Monitor* InvokeMethodIntrinsicTable_lock = nullptr;
46 Mutex* SharedDictionary_lock = nullptr;
47 Monitor* ClassInitError_lock = nullptr;
48 Mutex* Module_lock = nullptr;
49 Mutex* CompiledIC_lock = nullptr;
50 Mutex* VMStatistic_lock = nullptr;
51 Mutex* JmethodIdCreation_lock = nullptr;
52 Mutex* JfieldIdCreation_lock = nullptr;
53 Monitor* JNICritical_lock = nullptr;
54 Mutex* JvmtiThreadState_lock = nullptr;
55 Monitor* EscapeBarrier_lock = nullptr;
56 Monitor* JvmtiVTMSTransition_lock = nullptr;
57 Monitor* Heap_lock = nullptr;
58 #ifdef INCLUDE_PARALLELGC
59 Mutex* PSOldGenExpand_lock = nullptr;
60 #endif
61 Mutex* AdapterHandlerLibrary_lock = nullptr;
62 Mutex* SignatureHandlerLibrary_lock = nullptr;
63 Mutex* VtableStubs_lock = nullptr;
64 Mutex* SymbolArena_lock = nullptr;
65 Monitor* StringDedup_lock = nullptr;
66 Mutex* StringDedupIntern_lock = nullptr;
67 Monitor* CodeCache_lock = nullptr;
68 Mutex* TouchedMethodLog_lock = nullptr;
69 Mutex* RetData_lock = nullptr;
70 Monitor* VMOperation_lock = nullptr;
71 Monitor* ThreadsLockThrottle_lock = nullptr;
72 Monitor* Threads_lock = nullptr;
73 Mutex* NonJavaThreadsList_lock = nullptr;
74 Mutex* NonJavaThreadsListSync_lock = nullptr;
75 Monitor* CGC_lock = nullptr;
76 Monitor* STS_lock = nullptr;
77 Monitor* G1OldGCCount_lock = nullptr;
78 Mutex* G1RareEvent_lock = nullptr;
79 Mutex* G1DetachedRefinementStats_lock = nullptr;
80 Mutex* MarkStackFreeList_lock = nullptr;
81 Mutex* MarkStackChunkList_lock = nullptr;
82 Mutex* MonitoringSupport_lock = nullptr;
83 Monitor* ConcurrentGCBreakpoints_lock = nullptr;
84 Mutex* Compile_lock = nullptr;
85 Monitor* MethodCompileQueue_lock = nullptr;
86 Monitor* MethodCompileQueueC1_lock = nullptr;
87 Monitor* MethodCompileQueueC2_lock = nullptr;
88 Monitor* MethodCompileQueueC3_lock = nullptr;
89 Monitor* MethodCompileQueueSC1_lock = nullptr;
90 Monitor* MethodCompileQueueSC2_lock = nullptr;
91 Monitor* CompileThread_lock = nullptr;
92 Monitor* Compilation_lock = nullptr;
93 Mutex* CompileTaskAlloc_lock = nullptr;
94 Mutex* CompileStatistics_lock = nullptr;
95 Mutex* DirectivesStack_lock = nullptr;
96 Monitor* Terminator_lock = nullptr;
97 Monitor* InitCompleted_lock = nullptr;
98 Monitor* BeforeExit_lock = nullptr;
99 Monitor* Notify_lock = nullptr;
100 Mutex* ExceptionCache_lock = nullptr;
101 Mutex* TrainingData_lock = nullptr;
102 Monitor* TrainingReplayQueue_lock = nullptr;
103 #ifndef PRODUCT
104 Mutex* FullGCALot_lock = nullptr;
105 #endif
106
107 Mutex* tty_lock = nullptr;
108
109 Mutex* RawMonitor_lock = nullptr;
110 Mutex* PerfDataMemAlloc_lock = nullptr;
111 Mutex* PerfDataManager_lock = nullptr;
112
113 Mutex* FreeList_lock = nullptr;
114 Mutex* OldSets_lock = nullptr;
115 Mutex* Uncommit_lock = nullptr;
116 Monitor* RootRegionScan_lock = nullptr;
117
118 Mutex* Management_lock = nullptr;
119 Monitor* MonitorDeflation_lock = nullptr;
120 Monitor* Service_lock = nullptr;
121 Monitor* Notification_lock = nullptr;
122 Monitor* PeriodicTask_lock = nullptr;
123 Monitor* RedefineClasses_lock = nullptr;
124 Mutex* Verify_lock = nullptr;
125
126 #if INCLUDE_JFR
127 Mutex* JfrStacktrace_lock = nullptr;
128 Monitor* JfrMsg_lock = nullptr;
129 Mutex* JfrBuffer_lock = nullptr;
130 Monitor* JfrThreadSampler_lock = nullptr;
131 #endif
132
133 Mutex* CodeHeapStateAnalytics_lock = nullptr;
134
135 Mutex* ExternalsRecorder_lock = nullptr;
136
137 Monitor* ContinuationRelativize_lock = nullptr;
138
139 Mutex* Metaspace_lock = nullptr;
140 Monitor* MetaspaceCritical_lock = nullptr;
141 Mutex* ClassLoaderDataGraph_lock = nullptr;
142 Monitor* ThreadsSMRDelete_lock = nullptr;
143 Mutex* ThreadIdTableCreate_lock = nullptr;
144 Mutex* SharedDecoder_lock = nullptr;
145 Mutex* DCmdFactory_lock = nullptr;
146 Mutex* NMTQuery_lock = nullptr;
147 Mutex* NMTCompilationCostHistory_lock = nullptr;
148
149 #if INCLUDE_CDS
150 #if INCLUDE_JVMTI
151 Mutex* CDSClassFileStream_lock = nullptr;
152 #endif
153 Mutex* DumpTimeTable_lock = nullptr;
154 Mutex* CDSLambda_lock = nullptr;
155 Mutex* DumpRegion_lock = nullptr;
156 Mutex* ClassListFile_lock = nullptr;
157 Mutex* UnregisteredClassesTable_lock= nullptr;
158 Mutex* LambdaFormInvokers_lock = nullptr;
159 Mutex* ScratchObjects_lock = nullptr;
160 Mutex* ArchivedObjectTables_lock = nullptr;
161 #endif // INCLUDE_CDS
162 Mutex* Bootclasspath_lock = nullptr;
163
164 #if INCLUDE_JVMCI
165 Monitor* JVMCI_lock = nullptr;
166 Monitor* JVMCIRuntime_lock = nullptr;
167 #endif
168
169 // Only one RecursiveMutex
170 RecursiveMutex* MultiArray_lock = nullptr;
171
172 #define MAX_NUM_MUTEX 128
173 static Mutex* _mutex_array[MAX_NUM_MUTEX];
174 static int _num_mutex;
175
176 #ifdef ASSERT
177 void assert_locked_or_safepoint(const Mutex* lock) {
178 if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return;
179 // check if this thread owns the lock (common case)
180 assert(lock != nullptr, "Need non-null lock");
181 if (lock->owned_by_self()) return;
182 if (SafepointSynchronize::is_at_safepoint()) return;
183 if (!Universe::is_fully_initialized()) return;
184 fatal("must own lock %s", lock->name());
185 }
186
187 // a stronger assertion than the above
188 void assert_lock_strong(const Mutex* lock) {
189 if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return;
190 assert(lock != nullptr, "Need non-null lock");
191 if (lock->owned_by_self()) return;
192 fatal("must own lock %s", lock->name());
193 }
194 #endif
195
196 static void add_mutex(Mutex* var) {
197 assert(_num_mutex < MAX_NUM_MUTEX, "increase MAX_NUM_MUTEX");
198 int id = _num_mutex++;
199 _mutex_array[id] = var;
200 // var->set_id(id);
201 }
202
203 #define MUTEX_STORAGE_NAME(name) name##_storage
204 #define MUTEX_STORAGE(name, type) alignas(type) static uint8_t MUTEX_STORAGE_NAME(name)[sizeof(type)]
205 #define MUTEX_DEF(name, type, pri, ...) { \
206 assert(name == nullptr, "Mutex/Monitor initialized twice"); \
207 MUTEX_STORAGE(name, type); \
208 name = ::new(static_cast<void*>(MUTEX_STORAGE_NAME(name))) type((pri), #name, ##__VA_ARGS__); \
209 add_mutex(name); \
210 }
211 #define MUTEX_DEFN(name, type, pri, ...) MUTEX_DEF(name, type, Mutex::pri, ##__VA_ARGS__)
212
213 // Specify relative ranked lock
214 #ifdef ASSERT
215 #define MUTEX_DEFL(name, type, held_lock, ...) MUTEX_DEF(name, type, (held_lock)->rank() - 1, ##__VA_ARGS__)
216 #else
217 #define MUTEX_DEFL(name, type, held_lock, ...) MUTEX_DEFN(name, type, safepoint, ##__VA_ARGS__)
218 #endif
219
220 // Using Padded subclasses to prevent false sharing of these global monitors and mutexes.
221 void mutex_init() {
222 MUTEX_DEFN(tty_lock , PaddedMutex , tty); // allow to lock in VM
223
224 MUTEX_DEFN(STS_lock , PaddedMonitor, nosafepoint);
225
226 if (UseG1GC) {
227 MUTEX_DEFN(CGC_lock , PaddedMonitor, nosafepoint);
228
229 MUTEX_DEFN(G1DetachedRefinementStats_lock, PaddedMutex , nosafepoint-2);
230
231 MUTEX_DEFN(FreeList_lock , PaddedMutex , service-1);
232 MUTEX_DEFN(OldSets_lock , PaddedMutex , nosafepoint);
233 MUTEX_DEFN(Uncommit_lock , PaddedMutex , service-2);
234 MUTEX_DEFN(RootRegionScan_lock , PaddedMonitor, nosafepoint-1);
235
236 MUTEX_DEFN(MarkStackFreeList_lock , PaddedMutex , nosafepoint);
237 MUTEX_DEFN(MarkStackChunkList_lock , PaddedMutex , nosafepoint);
238 }
239 MUTEX_DEFN(MonitoringSupport_lock , PaddedMutex , service-1); // used for serviceability monitoring support
240
241 MUTEX_DEFN(StringDedup_lock , PaddedMonitor, nosafepoint);
242 MUTEX_DEFN(StringDedupIntern_lock , PaddedMutex , nosafepoint);
243 MUTEX_DEFN(RawMonitor_lock , PaddedMutex , nosafepoint-1);
244
245 MUTEX_DEFN(Metaspace_lock , PaddedMutex , nosafepoint-3);
246 MUTEX_DEFN(MetaspaceCritical_lock , PaddedMonitor, nosafepoint-1);
247
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 MUTEX_DEFN(Notification_lock , PaddedMonitor, service); // used for notification thread operations
251
252 MUTEX_DEFN(JmethodIdCreation_lock , PaddedMutex , nosafepoint-2); // used for creating jmethodIDs.
253 MUTEX_DEFN(InvokeMethodTypeTable_lock , PaddedMutex , safepoint);
254 MUTEX_DEFN(InvokeMethodIntrinsicTable_lock , PaddedMonitor, safepoint);
255 MUTEX_DEFN(AdapterHandlerLibrary_lock , PaddedMutex , safepoint);
256 MUTEX_DEFN(SharedDictionary_lock , PaddedMutex , safepoint);
257 MUTEX_DEFN(VMStatistic_lock , PaddedMutex , safepoint);
258 MUTEX_DEFN(SignatureHandlerLibrary_lock , PaddedMutex , safepoint);
259 MUTEX_DEFN(SymbolArena_lock , PaddedMutex , nosafepoint);
260 MUTEX_DEFN(ExceptionCache_lock , PaddedMutex , safepoint);
261 #ifndef PRODUCT
262 MUTEX_DEFN(FullGCALot_lock , PaddedMutex , safepoint); // a lock to make FullGCALot MT safe
263 #endif
264 MUTEX_DEFN(BeforeExit_lock , PaddedMonitor, safepoint);
265
266 MUTEX_DEFN(NonJavaThreadsList_lock , PaddedMutex , nosafepoint-1);
267 MUTEX_DEFN(NonJavaThreadsListSync_lock , PaddedMutex , nosafepoint);
268
269 MUTEX_DEFN(RetData_lock , PaddedMutex , safepoint);
270 MUTEX_DEFN(Terminator_lock , PaddedMonitor, safepoint, true);
271 MUTEX_DEFN(InitCompleted_lock , PaddedMonitor, nosafepoint);
272 MUTEX_DEFN(Notify_lock , PaddedMonitor, safepoint, true);
273
274 MUTEX_DEFN(JfieldIdCreation_lock , PaddedMutex , safepoint);
275
276 MUTEX_DEFN(CompiledIC_lock , PaddedMutex , nosafepoint); // locks VtableStubs_lock
277 MUTEX_DEFN(MethodCompileQueue_lock , PaddedMonitor, safepoint);
278 if (UseGlobalCompileQueueLock) {
279 MethodCompileQueueC1_lock = MethodCompileQueue_lock;
280 MethodCompileQueueC2_lock = MethodCompileQueue_lock;
281 MethodCompileQueueC3_lock = MethodCompileQueue_lock;
282 MethodCompileQueueSC1_lock = MethodCompileQueue_lock;
283 MethodCompileQueueSC2_lock = MethodCompileQueue_lock;
284 } else {
285 MUTEX_DEFN(MethodCompileQueueC1_lock , PaddedMonitor, safepoint);
286 MUTEX_DEFN(MethodCompileQueueC2_lock , PaddedMonitor, safepoint);
287 MUTEX_DEFN(MethodCompileQueueC3_lock , PaddedMonitor, safepoint);
288 MUTEX_DEFN(MethodCompileQueueSC1_lock , PaddedMonitor, safepoint);
289 MUTEX_DEFN(MethodCompileQueueSC2_lock , PaddedMonitor, safepoint);
290 }
291 MUTEX_DEFL(TrainingData_lock , PaddedMutex , MethodCompileQueue_lock);
292 MUTEX_DEFN(TrainingReplayQueue_lock , PaddedMonitor, safepoint);
293 MUTEX_DEFN(CompileStatistics_lock , PaddedMutex , safepoint);
294 MUTEX_DEFN(DirectivesStack_lock , PaddedMutex , nosafepoint);
295
296 MUTEX_DEFN(JvmtiVTMSTransition_lock , PaddedMonitor, safepoint); // used for Virtual Thread Mount State transition management
297 MUTEX_DEFN(EscapeBarrier_lock , PaddedMonitor, nosafepoint); // Used to synchronize object reallocation/relocking triggered by JVMTI
298 MUTEX_DEFN(Management_lock , PaddedMutex , safepoint); // used for JVM management
299
300 MUTEX_DEFN(ConcurrentGCBreakpoints_lock , PaddedMonitor, safepoint, true);
301 MUTEX_DEFN(TouchedMethodLog_lock , PaddedMutex , safepoint);
302
303 MUTEX_DEFN(CompileThread_lock , PaddedMonitor, safepoint);
304 MUTEX_DEFN(PeriodicTask_lock , PaddedMonitor, safepoint, true);
305 MUTEX_DEFN(RedefineClasses_lock , PaddedMonitor, safepoint);
306 MUTEX_DEFN(Verify_lock , PaddedMutex , safepoint);
307 MUTEX_DEFN(ClassLoaderDataGraph_lock , PaddedMutex , safepoint);
308
309 MUTEX_DEFN(Compilation_lock , PaddedMonitor, nosafepoint);
310
311 #if INCLUDE_JFR
312 MUTEX_DEFN(JfrBuffer_lock , PaddedMutex , event);
313 MUTEX_DEFN(JfrMsg_lock , PaddedMonitor, event);
314 MUTEX_DEFN(JfrStacktrace_lock , PaddedMutex , event);
315 MUTEX_DEFN(JfrThreadSampler_lock , PaddedMonitor, nosafepoint);
316 #endif
317
318 MUTEX_DEFN(ContinuationRelativize_lock , PaddedMonitor, nosafepoint-3);
319 MUTEX_DEFN(CodeHeapStateAnalytics_lock , PaddedMutex , safepoint);
320 MUTEX_DEFN(ThreadsSMRDelete_lock , PaddedMonitor, service-2); // Holds ConcurrentHashTableResize_lock
321 MUTEX_DEFN(ThreadIdTableCreate_lock , PaddedMutex , safepoint);
322 MUTEX_DEFN(SharedDecoder_lock , PaddedMutex , tty-1);
323 MUTEX_DEFN(DCmdFactory_lock , PaddedMutex , nosafepoint);
324 MUTEX_DEFN(NMTQuery_lock , PaddedMutex , safepoint);
325 MUTEX_DEFN(NMTCompilationCostHistory_lock , PaddedMutex , nosafepoint);
326 #if INCLUDE_CDS
327 #if INCLUDE_JVMTI
328 MUTEX_DEFN(CDSClassFileStream_lock , PaddedMutex , safepoint);
329 #endif
330 MUTEX_DEFN(DumpTimeTable_lock , PaddedMutex , nosafepoint);
331 MUTEX_DEFN(CDSLambda_lock , PaddedMutex , nosafepoint);
332 MUTEX_DEFN(DumpRegion_lock , PaddedMutex , nosafepoint);
333 MUTEX_DEFN(ClassListFile_lock , PaddedMutex , nosafepoint);
334 MUTEX_DEFN(UnregisteredClassesTable_lock , PaddedMutex , nosafepoint-1);
335 MUTEX_DEFN(LambdaFormInvokers_lock , PaddedMutex , safepoint);
336 MUTEX_DEFN(ScratchObjects_lock , PaddedMutex , nosafepoint-1); // Holds DumpTimeTable_lock
337 MUTEX_DEFN(ArchivedObjectTables_lock , PaddedMutex , nosafepoint);
338 #endif // INCLUDE_CDS
339 MUTEX_DEFN(Bootclasspath_lock , PaddedMutex , nosafepoint);
340
341 #if INCLUDE_JVMCI
342 // JVMCIRuntime::_lock must be acquired before JVMCI_lock to avoid deadlock
343 MUTEX_DEFN(JVMCIRuntime_lock , PaddedMonitor, safepoint, true);
344 #endif
345
346 MUTEX_DEFN(ThreadsLockThrottle_lock , PaddedMonitor, safepoint);
347
348 // These locks have relative rankings, and inherit safepoint checking attributes from that rank.
349 MUTEX_DEFL(VtableStubs_lock , PaddedMutex , CompiledIC_lock); // Also holds DumpTimeTable_lock
350 MUTEX_DEFL(CodeCache_lock , PaddedMonitor, VtableStubs_lock);
351 MUTEX_DEFL(NMethodState_lock , PaddedMutex , CodeCache_lock);
352
353 // tty_lock is held when printing nmethod and its relocations which use this lock.
354 MUTEX_DEFL(ExternalsRecorder_lock , PaddedMutex , tty_lock);
355
356 MUTEX_DEFL(Threads_lock , PaddedMonitor, CompileThread_lock, true);
357 MUTEX_DEFL(Compile_lock , PaddedMutex , MethodCompileQueue_lock);
358 MUTEX_DEFL(Heap_lock , PaddedMonitor, TrainingData_lock /*AdapterHandlerLibrary_lock*/);
359
360 MUTEX_DEFL(PerfDataMemAlloc_lock , PaddedMutex , Heap_lock);
361 MUTEX_DEFL(PerfDataManager_lock , PaddedMutex , Heap_lock);
362 MUTEX_DEFL(VMOperation_lock , PaddedMonitor, Heap_lock, true);
363 MUTEX_DEFL(ClassInitError_lock , PaddedMonitor, Threads_lock);
364
365 if (UseG1GC) {
366 MUTEX_DEFL(G1OldGCCount_lock , PaddedMonitor, Threads_lock, true);
367 MUTEX_DEFL(G1RareEvent_lock , PaddedMutex , Threads_lock, true);
368 }
369
370 MUTEX_DEFL(CompileTaskAlloc_lock , PaddedMutex , MethodCompileQueue_lock);
371 #ifdef INCLUDE_PARALLELGC
372 if (UseParallelGC) {
373 MUTEX_DEFL(PSOldGenExpand_lock , PaddedMutex , Heap_lock, true);
374 }
375 #endif
376 MUTEX_DEFL(Module_lock , PaddedMutex , ClassLoaderDataGraph_lock);
377 MUTEX_DEFL(SystemDictionary_lock , PaddedMonitor, Module_lock);
378 MUTEX_DEFL(JNICritical_lock , PaddedMonitor, AdapterHandlerLibrary_lock); // used for JNI critical regions
379 #if INCLUDE_JVMCI
380 // JVMCIRuntime_lock must be acquired before JVMCI_lock to avoid deadlock
381 MUTEX_DEFL(JVMCI_lock , PaddedMonitor, JVMCIRuntime_lock);
382 #endif
383 MUTEX_DEFL(JvmtiThreadState_lock , PaddedMutex , JvmtiVTMSTransition_lock); // Used by JvmtiThreadState/JvmtiEventController
384
385 // Allocate RecursiveMutex
386 MultiArray_lock = new RecursiveMutex();
387 }
388
389 #undef MUTEX_DEFL
390 #undef MUTEX_DEFN
391 #undef MUTEX_DEF
392 #undef MUTEX_STORAGE
393 #undef MUTEX_STORAGE_NAME
394
395 static const int MAX_NAMES = 200;
396 static const char* _names[MAX_NAMES] = { nullptr };
397 static bool _is_unique[MAX_NAMES] = { false };
398 static int _num_names = 0;
399
400 PerfCounter** MutexLockerImpl::_perf_lock_count = nullptr;
401 PerfCounter** MutexLockerImpl::_perf_lock_wait_time = nullptr;
402 PerfCounter** MutexLockerImpl::_perf_lock_hold_time = nullptr;
403
404 void MutexLockerImpl::init_counters() {
405 if (ProfileVMLocks && UsePerfData) {
406 ResourceMark rm;
407 EXCEPTION_MARK;
408 _perf_lock_count = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
409 _perf_lock_wait_time = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
410 _perf_lock_hold_time = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
411
412 NEWPERFEVENTCOUNTER(_perf_lock_count[0], SUN_RT, PerfDataManager::counter_name("Other", "Count"));
413 NEWPERFEVENTCOUNTER(_perf_lock_wait_time[0], SUN_RT, PerfDataManager::counter_name("Other", "BeforeTime"));
414 NEWPERFEVENTCOUNTER(_perf_lock_hold_time[0], SUN_RT, PerfDataManager::counter_name("Other", "AfterTime"));
415 for (int i = 0; i < MAX_NAMES; i++) {
416 ResourceMark rm;
417 const char* counter_name = _names[i];
418 if (counter_name == nullptr) {
419 stringStream ss;
420 ss.print("UnnamedMutex#%d", i);
421 counter_name = ss.as_string();
422 }
423 NEWPERFEVENTCOUNTER(_perf_lock_count[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "Count"));
424 NEWPERFEVENTCOUNTER(_perf_lock_wait_time[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "BeforeTime"));
425 NEWPERFEVENTCOUNTER(_perf_lock_hold_time[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "AfterTime"));
426 }
427 if (HAS_PENDING_EXCEPTION) {
428 vm_exit_during_initialization("MutexLockerImpl::init_counters() failed unexpectedly");
429 }
430 }
431 }
432
433 int MutexLockerImpl::name2id(const char* name) {
434 if (ProfileVMLocks && UsePerfData) {
435 for (int i = 0; i < _num_names; i++) {
436 if (strcmp(_names[i], name) == 0) {
437 _is_unique[i] = false;
438 return i;
439 }
440 }
441 if (_num_names < MAX_NAMES) {
442 int new_id = _num_names++;
443 _names[new_id] = os::strdup(name, mtInternal);
444 _is_unique[new_id] = true;
445 return new_id;
446 }
447 log_debug(init)("Unnamed: %s", name); // no slots left
448 }
449 return -1;
450 }
451
452 void MutexLockerImpl::print_counter_on(outputStream* st, const char* name, bool is_unique, int idx) {
453 jlong count = _perf_lock_count[idx]->get_value();
454 if (count > 0) {
455 st->print_cr(" %3d: %s%40s = " JLONG_FORMAT_W(5) "us (" JLONG_FORMAT_W(5) "us) / " JLONG_FORMAT_W(9) " events",
456 idx, (is_unique ? " " : "M"), name,
457 Management::ticks_to_us(_perf_lock_hold_time[idx]->get_value()),
458 Management::ticks_to_us(_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 = " JLONG_FORMAT "us (wait = " JLONG_FORMAT "us) / " JLONG_FORMAT " events for thread \"main\"",
481 _num_mutex, _num_names,
482 Management::ticks_to_us(total_hold_time),
483 Management::ticks_to_us(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 }