1 /*
2 * Copyright (c) 2003, 2025, 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 "classfile/classLoader.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmClasses.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "gc/shared/collectedHeap.hpp"
30 #include "jmm.h"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/iterator.hpp"
33 #include "memory/oopFactory.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "memory/universe.hpp"
36 #include "oops/klass.hpp"
37 #include "oops/klass.inline.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "oops/objArrayOop.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "oops/oopHandle.inline.hpp"
42 #include "oops/typeArrayOop.inline.hpp"
43 #include "runtime/flags/jvmFlag.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/handles.inline.hpp"
46 #include "runtime/interfaceSupport.inline.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/jniHandles.inline.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/notificationThread.hpp"
51 #include "runtime/os.hpp"
52 #include "runtime/thread.inline.hpp"
53 #include "runtime/threads.hpp"
54 #include "runtime/threadSMR.hpp"
55 #include "runtime/vmOperations.hpp"
56 #include "services/classLoadingService.hpp"
57 #include "services/cpuTimeUsage.hpp"
58 #include "services/diagnosticCommand.hpp"
59 #include "services/diagnosticFramework.hpp"
60 #include "services/finalizerService.hpp"
61 #include "services/gcNotifier.hpp"
62 #include "services/heapDumper.hpp"
63 #include "services/lowMemoryDetector.hpp"
64 #include "services/management.hpp"
65 #include "services/memoryManager.hpp"
66 #include "services/memoryPool.hpp"
67 #include "services/memoryService.hpp"
68 #include "services/runtimeService.hpp"
69 #include "services/threadService.hpp"
70 #include "services/writeableFlags.hpp"
71 #include "utilities/debug.hpp"
72 #include "utilities/formatBuffer.hpp"
73 #include "utilities/macros.hpp"
74
75 PerfVariable* Management::_begin_vm_creation_time = nullptr;
76 PerfVariable* Management::_end_vm_creation_time = nullptr;
77 PerfVariable* Management::_vm_init_done_time = nullptr;
78
79 InstanceKlass* Management::_diagnosticCommandImpl_klass = nullptr;
80 InstanceKlass* Management::_garbageCollectorExtImpl_klass = nullptr;
81 InstanceKlass* Management::_garbageCollectorMXBean_klass = nullptr;
82 InstanceKlass* Management::_gcInfo_klass = nullptr;
83 InstanceKlass* Management::_managementFactoryHelper_klass = nullptr;
84 InstanceKlass* Management::_memoryManagerMXBean_klass = nullptr;
85 InstanceKlass* Management::_memoryPoolMXBean_klass = nullptr;
86 InstanceKlass* Management::_memoryUsage_klass = nullptr;
87 InstanceKlass* Management::_sensor_klass = nullptr;
88 InstanceKlass* Management::_threadInfo_klass = nullptr;
89
90 jmmOptionalSupport Management::_optional_support = {0};
91 TimeStamp Management::_stamp;
92
93 void management_init() {
94 #if INCLUDE_MANAGEMENT
95 Management::init();
96 ThreadService::init();
97 RuntimeService::init();
98 ClassLoadingService::init();
99 FinalizerService::init();
100 #else
101 ThreadService::init();
102 #endif // INCLUDE_MANAGEMENT
103 }
104
105 #if INCLUDE_MANAGEMENT
106
107 void Management::init() {
108 EXCEPTION_MARK;
109
110 // These counters are for java.lang.management API support.
111 // They are created even if -XX:-UsePerfData is set and in
112 // that case, they will be allocated on C heap.
113
114 _begin_vm_creation_time =
115 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
116 PerfData::U_None, CHECK);
117
118 _end_vm_creation_time =
119 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
120 PerfData::U_None, CHECK);
121
122 _vm_init_done_time =
123 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
124 PerfData::U_None, CHECK);
125
126 // Initialize optional support
127 _optional_support.isLowMemoryDetectionSupported = 1;
128 _optional_support.isCompilationTimeMonitoringSupported = 1;
129 _optional_support.isThreadContentionMonitoringSupported = 1;
130
131 if (os::is_thread_cpu_time_supported()) {
132 _optional_support.isCurrentThreadCpuTimeSupported = 1;
133 _optional_support.isOtherThreadCpuTimeSupported = 1;
134 } else {
135 _optional_support.isCurrentThreadCpuTimeSupported = 0;
136 _optional_support.isOtherThreadCpuTimeSupported = 0;
137 }
138
139 _optional_support.isObjectMonitorUsageSupported = 1;
140 #if INCLUDE_SERVICES
141 // This depends on the heap inspector
142 _optional_support.isSynchronizerUsageSupported = 1;
143 #endif // INCLUDE_SERVICES
144 _optional_support.isThreadAllocatedMemorySupported = 1;
145 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
146
147 // Registration of the diagnostic commands
148 DCmd::register_dcmds();
149 }
150
151 void Management::initialize(TRAPS) {
152 NotificationThread::initialize();
153
154 if (ManagementServer) {
155 ResourceMark rm(THREAD);
156 HandleMark hm(THREAD);
157
158 // Load and initialize the jdk.internal.agent.Agent class
159 // invoke startAgent method to start the management server
160 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
161 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
162 loader,
163 THREAD);
164 if (k == nullptr) {
165 vm_exit_during_initialization("Management agent initialization failure: "
166 "class jdk.internal.agent.Agent not found.");
167 }
168
169 JavaValue result(T_VOID);
170 JavaCalls::call_static(&result,
171 k,
172 vmSymbols::startAgent_name(),
173 vmSymbols::void_method_signature(),
174 CHECK);
175 }
176 }
177
178 void Management::get_optional_support(jmmOptionalSupport* support) {
179 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
180 }
181
182 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
183 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
184 return initialize_klass(k, THREAD);
185 }
186
187 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
188 Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
189 if (k == nullptr) {
190 return nullptr;
191 }
192 return initialize_klass(k, THREAD);
193 }
194
195 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
196 InstanceKlass* ik = InstanceKlass::cast(k);
197 if (ik->should_be_initialized()) {
198 ik->initialize(CHECK_NULL);
199 }
200 // If these classes change to not be owned by the boot loader, they need
201 // to be walked to keep their class loader alive in oops_do.
202 assert(ik->class_loader() == nullptr, "need to follow in oops_do");
203 return ik;
204 }
205
206
207 void Management::record_vm_init_completed() {
208 // Initialize the timestamp to get the current time
209 _vm_init_done_time->set_value(os::javaTimeMillis());
210
211 // Update the timestamp to the vm init done time
212 _stamp.update();
213 }
214
215 void Management::record_vm_startup_time(jlong begin, jlong duration) {
216 // if the performance counter is not initialized,
217 // then vm initialization failed; simply return.
218 if (_begin_vm_creation_time == nullptr) return;
219
220 _begin_vm_creation_time->set_value(begin);
221 _end_vm_creation_time->set_value(begin + duration);
222 PerfMemory::set_accessible(true);
223 }
224
225 jlong Management::begin_vm_creation_time() {
226 return _begin_vm_creation_time->get_value();
227 }
228
229 jlong Management::vm_init_done_time() {
230 return _vm_init_done_time->get_value();
231 }
232
233 jlong Management::timestamp() {
234 TimeStamp t;
235 t.update();
236 return t.ticks() - _stamp.ticks();
237 }
238
239 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
240 if (_threadInfo_klass == nullptr) {
241 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
242 }
243 return _threadInfo_klass;
244 }
245
246 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
247 if (_memoryUsage_klass == nullptr) {
248 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
249 }
250 return _memoryUsage_klass;
251 }
252
253 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
254 if (_memoryPoolMXBean_klass == nullptr) {
255 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
256 }
257 return _memoryPoolMXBean_klass;
258 }
259
260 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
261 if (_memoryManagerMXBean_klass == nullptr) {
262 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
263 }
264 return _memoryManagerMXBean_klass;
265 }
266
267 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
268 if (_garbageCollectorMXBean_klass == nullptr) {
269 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
270 }
271 return _garbageCollectorMXBean_klass;
272 }
273
274 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
275 if (_sensor_klass == nullptr) {
276 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
277 }
278 return _sensor_klass;
279 }
280
281 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
282 if (_managementFactoryHelper_klass == nullptr) {
283 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
284 }
285 return _managementFactoryHelper_klass;
286 }
287
288 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
289 if (_garbageCollectorExtImpl_klass == nullptr) {
290 _garbageCollectorExtImpl_klass =
291 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
292 }
293 return _garbageCollectorExtImpl_klass;
294 }
295
296 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
297 if (_gcInfo_klass == nullptr) {
298 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
299 }
300 return _gcInfo_klass;
301 }
302
303 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
304 if (_diagnosticCommandImpl_klass == nullptr) {
305 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
306 }
307 return _diagnosticCommandImpl_klass;
308 }
309
310 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
311 Handle snapshot_thread(THREAD, snapshot->threadObj());
312
313 jlong contended_time;
314 jlong waited_time;
315 if (ThreadService::is_thread_monitoring_contention()) {
316 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
317 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
318 } else {
319 // set them to -1 if thread contention monitoring is disabled.
320 contended_time = max_julong;
321 waited_time = max_julong;
322 }
323
324 int thread_status = static_cast<int>(snapshot->thread_status());
325 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
326 if (snapshot->is_suspended()) {
327 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
328 }
329 if (snapshot->is_in_native()) {
330 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
331 }
332
333 ThreadStackTrace* st = snapshot->get_stack_trace();
334 Handle stacktrace_h;
335 if (st != nullptr) {
336 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
337 } else {
338 stacktrace_h = Handle();
339 }
340
341 args->push_oop(snapshot_thread);
342 args->push_int(thread_status);
343 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
344 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
345 args->push_long(snapshot->contended_enter_count());
346 args->push_long(contended_time);
347 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
348 args->push_long(waited_time);
349 args->push_oop(stacktrace_h);
350 }
351
352 // Helper function to construct a ThreadInfo object
353 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
354 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
355 JavaCallArguments args(14);
356
357 // initialize the arguments for the ThreadInfo constructor
358 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
359
360 // Call ThreadInfo constructor with no locked monitors and synchronizers
361 Handle element = JavaCalls::construct_new_instance(
362 ik,
363 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
364 &args,
365 CHECK_NULL);
366 return (instanceOop) element();
367 }
368
369 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
370 objArrayHandle monitors_array,
371 typeArrayHandle depths_array,
372 objArrayHandle synchronizers_array,
373 TRAPS) {
374 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
375 JavaCallArguments args(17);
376
377 // initialize the arguments for the ThreadInfo constructor
378 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
379
380 // push the locked monitors and synchronizers in the arguments
381 args.push_oop(monitors_array);
382 args.push_oop(depths_array);
383 args.push_oop(synchronizers_array);
384
385 // Call ThreadInfo constructor with locked monitors and synchronizers
386 Handle element = JavaCalls::construct_new_instance(
387 ik,
388 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
389 &args,
390 CHECK_NULL);
391 return (instanceOop) element();
392 }
393
394
395 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
396 if (mgr == nullptr) {
397 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
398 }
399 oop mgr_obj = JNIHandles::resolve(mgr);
400 instanceHandle h(THREAD, (instanceOop) mgr_obj);
401
402 InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
403 if (!h->is_a(k)) {
404 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
405 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
406 nullptr);
407 }
408
409 MemoryManager* gc = MemoryService::get_memory_manager(h);
410 if (gc == nullptr || !gc->is_gc_memory_manager()) {
411 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
412 "Invalid GC memory manager",
413 nullptr);
414 }
415 return (GCMemoryManager*) gc;
416 }
417
418 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
419 if (obj == nullptr) {
420 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
421 }
422
423 oop pool_obj = JNIHandles::resolve(obj);
424 assert(pool_obj->is_instance(), "Should be an instanceOop");
425 instanceHandle ph(THREAD, (instanceOop) pool_obj);
426
427 return MemoryService::get_memory_pool(ph);
428 }
429
430 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
431 int num_threads = ids_ah->length();
432
433 // Validate input thread IDs
434 int i = 0;
435 for (i = 0; i < num_threads; i++) {
436 jlong tid = ids_ah->long_at(i);
437 if (tid <= 0) {
438 // throw exception if invalid thread id.
439 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
440 "Invalid thread ID entry");
441 }
442 }
443 }
444
445 // Returns true if the JavaThread's Java object is a platform thread
446 static bool is_platform_thread(JavaThread* jt) {
447 if (jt != nullptr) {
448 oop thread_obj = jt->threadObj();
449 return (thread_obj != nullptr) && !thread_obj->is_a(vmClasses::BoundVirtualThread_klass());
450 } else {
451 return false;
452 }
453 }
454
455 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
456 // check if the element of infoArray is of type ThreadInfo class
457 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
458 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
459 if (element_klass != threadinfo_klass) {
460 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
461 "infoArray element type is not ThreadInfo class");
462 }
463 }
464
465 // Returns true if the ThreadSnapshot's Java object is a platform thread
466 static bool is_platform_thread(ThreadSnapshot* ts) {
467 oop thread_obj = ts->threadObj();
468 return (thread_obj != nullptr) && !thread_obj->is_a(vmClasses::BoundVirtualThread_klass());
469 }
470
471 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
472 if (obj == nullptr) {
473 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
474 }
475
476 oop mgr_obj = JNIHandles::resolve(obj);
477 assert(mgr_obj->is_instance(), "Should be an instanceOop");
478 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
479
480 return MemoryService::get_memory_manager(mh);
481 }
482
483 // Returns a version string and sets major and minor version if
484 // the input parameters are non-null.
485 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
486 return JMM_VERSION;
487 JVM_END
488
489 // Gets the list of VM monitoring and management optional supports
490 // Returns 0 if succeeded; otherwise returns non-zero.
491 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
492 if (support == nullptr) {
493 return -1;
494 }
495 Management::get_optional_support(support);
496 return 0;
497 JVM_END
498
499 // Returns an array of java/lang/management/MemoryPoolMXBean object
500 // one for each memory pool if obj == null; otherwise returns
501 // an array of memory pools for a given memory manager if
502 // it is a valid memory manager.
503 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
504 ResourceMark rm(THREAD);
505
506 int num_memory_pools;
507 MemoryManager* mgr = nullptr;
508 if (obj == nullptr) {
509 num_memory_pools = MemoryService::num_memory_pools();
510 } else {
511 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
512 if (mgr == nullptr) {
513 return nullptr;
514 }
515 num_memory_pools = mgr->num_memory_pools();
516 }
517
518 // Allocate the resulting MemoryPoolMXBean[] object
519 InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
520 objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
521 objArrayHandle poolArray(THREAD, r);
522
523 if (mgr == nullptr) {
524 // Get all memory pools
525 for (int i = 0; i < num_memory_pools; i++) {
526 MemoryPool* pool = MemoryService::get_memory_pool(i);
527 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
528 instanceHandle ph(THREAD, p);
529 poolArray->obj_at_put(i, ph());
530 }
531 } else {
532 // Get memory pools managed by a given memory manager
533 for (int i = 0; i < num_memory_pools; i++) {
534 MemoryPool* pool = mgr->get_memory_pool(i);
535 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
536 instanceHandle ph(THREAD, p);
537 poolArray->obj_at_put(i, ph());
538 }
539 }
540 return (jobjectArray) JNIHandles::make_local(THREAD, poolArray());
541 JVM_END
542
543 // Returns an array of java/lang/management/MemoryManagerMXBean object
544 // one for each memory manager if obj == null; otherwise returns
545 // an array of memory managers for a given memory pool if
546 // it is a valid memory pool.
547 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
548 ResourceMark rm(THREAD);
549
550 int num_mgrs;
551 MemoryPool* pool = nullptr;
552 if (obj == nullptr) {
553 num_mgrs = MemoryService::num_memory_managers();
554 } else {
555 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
556 if (pool == nullptr) {
557 return nullptr;
558 }
559 num_mgrs = pool->num_memory_managers();
560 }
561
562 // Allocate the resulting MemoryManagerMXBean[] object
563 InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
564 objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
565 objArrayHandle mgrArray(THREAD, r);
566
567 if (pool == nullptr) {
568 // Get all memory managers
569 for (int i = 0; i < num_mgrs; i++) {
570 MemoryManager* mgr = MemoryService::get_memory_manager(i);
571 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
572 instanceHandle ph(THREAD, p);
573 mgrArray->obj_at_put(i, ph());
574 }
575 } else {
576 // Get memory managers for a given memory pool
577 for (int i = 0; i < num_mgrs; i++) {
578 MemoryManager* mgr = pool->get_memory_manager(i);
579 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
580 instanceHandle ph(THREAD, p);
581 mgrArray->obj_at_put(i, ph());
582 }
583 }
584 return (jobjectArray) JNIHandles::make_local(THREAD, mgrArray());
585 JVM_END
586
587
588 // Returns a java/lang/management/MemoryUsage object containing the memory usage
589 // of a given memory pool.
590 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
591 ResourceMark rm(THREAD);
592
593 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
594 if (pool != nullptr) {
595 MemoryUsage usage = pool->get_memory_usage();
596 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
597 return JNIHandles::make_local(THREAD, h());
598 } else {
599 return nullptr;
600 }
601 JVM_END
602
603 // Returns a java/lang/management/MemoryUsage object containing the memory usage
604 // of a given memory pool.
605 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
606 ResourceMark rm(THREAD);
607
608 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
609 if (pool != nullptr) {
610 MemoryUsage usage = pool->get_peak_memory_usage();
611 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
612 return JNIHandles::make_local(THREAD, h());
613 } else {
614 return nullptr;
615 }
616 JVM_END
617
618 // Returns a java/lang/management/MemoryUsage object containing the memory usage
619 // of a given memory pool after most recent GC.
620 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
621 ResourceMark rm(THREAD);
622
623 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
624 if (pool != nullptr && pool->is_collected_pool()) {
625 MemoryUsage usage = pool->get_last_collection_usage();
626 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
627 return JNIHandles::make_local(THREAD, h());
628 } else {
629 return nullptr;
630 }
631 JVM_END
632
633 // Sets the memory pool sensor for a threshold type
634 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
635 if (obj == nullptr || sensorObj == nullptr) {
636 THROW(vmSymbols::java_lang_NullPointerException());
637 }
638
639 InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
640 oop s = JNIHandles::resolve(sensorObj);
641 assert(s->is_instance(), "Sensor should be an instanceOop");
642 instanceHandle sensor_h(THREAD, (instanceOop) s);
643 if (!sensor_h->is_a(sensor_klass)) {
644 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
645 "Sensor is not an instance of sun.management.Sensor class");
646 }
647
648 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
649 assert(mpool != nullptr, "MemoryPool should exist");
650
651 switch (type) {
652 case JMM_USAGE_THRESHOLD_HIGH:
653 case JMM_USAGE_THRESHOLD_LOW:
654 // have only one sensor for threshold high and low
655 mpool->set_usage_sensor_obj(sensor_h);
656 break;
657 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
658 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
659 // have only one sensor for threshold high and low
660 mpool->set_gc_usage_sensor_obj(sensor_h);
661 break;
662 default:
663 assert(false, "Unrecognized type");
664 }
665
666 JVM_END
667
668
669 // Sets the threshold of a given memory pool.
670 // Returns the previous threshold.
671 //
672 // Input parameters:
673 // pool - the MemoryPoolMXBean object
674 // type - threshold type
675 // threshold - the new threshold (must not be negative)
676 //
677 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
678 if (threshold < 0) {
679 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
680 "Invalid threshold value",
681 -1);
682 }
683
684 if ((size_t)threshold > max_uintx) {
685 stringStream st;
686 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (%zu)", threshold, max_uintx);
687 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
688 }
689
690 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
691 assert(pool != nullptr, "MemoryPool should exist");
692
693 jlong prev = 0;
694 switch (type) {
695 case JMM_USAGE_THRESHOLD_HIGH:
696 if (!pool->usage_threshold()->is_high_threshold_supported()) {
697 return -1;
698 }
699 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
700 break;
701
702 case JMM_USAGE_THRESHOLD_LOW:
703 if (!pool->usage_threshold()->is_low_threshold_supported()) {
704 return -1;
705 }
706 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
707 break;
708
709 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
710 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
711 return -1;
712 }
713 // return and the new threshold is effective for the next GC
714 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
715
716 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
717 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
718 return -1;
719 }
720 // return and the new threshold is effective for the next GC
721 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
722
723 default:
724 assert(false, "Unrecognized type");
725 return -1;
726 }
727
728 // When the threshold is changed, reevaluate if the low memory
729 // detection is enabled.
730 if (prev != threshold) {
731 LowMemoryDetector::recompute_enabled_for_collected_pools();
732 LowMemoryDetector::detect_low_memory(pool);
733 }
734 return prev;
735 JVM_END
736
737 // Returns a java/lang/management/MemoryUsage object representing
738 // the memory usage for the heap or non-heap memory.
739 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
740 ResourceMark rm(THREAD);
741
742 MemoryUsage usage;
743
744 if (heap) {
745 usage = Universe::heap()->memory_usage();
746 } else {
747 // Calculate the memory usage by summing up the pools.
748 size_t total_init = 0;
749 size_t total_used = 0;
750 size_t total_committed = 0;
751 size_t total_max = 0;
752 bool has_undefined_init_size = false;
753 bool has_undefined_max_size = false;
754
755 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
756 MemoryPool* pool = MemoryService::get_memory_pool(i);
757 if (pool->is_non_heap()) {
758 MemoryUsage u = pool->get_memory_usage();
759 total_used += u.used();
760 total_committed += u.committed();
761
762 if (u.init_size() == MemoryUsage::undefined_size()) {
763 has_undefined_init_size = true;
764 }
765 if (!has_undefined_init_size) {
766 total_init += u.init_size();
767 }
768
769 if (u.max_size() == MemoryUsage::undefined_size()) {
770 has_undefined_max_size = true;
771 }
772 if (!has_undefined_max_size) {
773 total_max += u.max_size();
774 }
775 }
776 }
777
778 // if any one of the memory pool has undefined init_size or max_size,
779 // set it to MemoryUsage::undefined_size()
780 if (has_undefined_init_size) {
781 total_init = MemoryUsage::undefined_size();
782 }
783 if (has_undefined_max_size) {
784 total_max = MemoryUsage::undefined_size();
785 }
786
787 usage = MemoryUsage(total_init, total_used, total_committed, total_max);
788 }
789
790 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
791 return JNIHandles::make_local(THREAD, obj());
792 JVM_END
793
794 // Returns the boolean value of a given attribute.
795 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
796 switch (att) {
797 case JMM_VERBOSE_GC:
798 return MemoryService::get_verbose();
799 case JMM_VERBOSE_CLASS:
800 return ClassLoadingService::get_verbose();
801 case JMM_THREAD_CONTENTION_MONITORING:
802 return ThreadService::is_thread_monitoring_contention();
803 case JMM_THREAD_CPU_TIME:
804 return ThreadService::is_thread_cpu_time_enabled();
805 case JMM_THREAD_ALLOCATED_MEMORY:
806 return ThreadService::is_thread_allocated_memory_enabled();
807 default:
808 assert(0, "Unrecognized attribute");
809 return false;
810 }
811 JVM_END
812
813 // Sets the given boolean attribute and returns the previous value.
814 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
815 switch (att) {
816 case JMM_VERBOSE_GC:
817 return MemoryService::set_verbose(flag != 0);
818 case JMM_VERBOSE_CLASS:
819 return ClassLoadingService::set_verbose(flag != 0);
820 case JMM_THREAD_CONTENTION_MONITORING:
821 return ThreadService::set_thread_monitoring_contention(flag != 0);
822 case JMM_THREAD_CPU_TIME:
823 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
824 case JMM_THREAD_ALLOCATED_MEMORY:
825 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
826 default:
827 assert(0, "Unrecognized attribute");
828 return false;
829 }
830 JVM_END
831
832
833 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
834 switch (att) {
835 case JMM_GC_TIME_MS:
836 return mgr->gc_time_ms();
837
838 case JMM_GC_COUNT:
839 return mgr->gc_count();
840
841 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
842 // current implementation only has 1 ext attribute
843 return 1;
844
845 default:
846 assert(0, "Unrecognized GC attribute");
847 return -1;
848 }
849 }
850
851 class VmThreadCountClosure: public ThreadClosure {
852 private:
853 int _count;
854 public:
855 VmThreadCountClosure() : _count(0) {};
856 void do_thread(Thread* thread);
857 int count() { return _count; }
858 };
859
860 void VmThreadCountClosure::do_thread(Thread* thread) {
861 // exclude externally visible JavaThreads
862 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
863 return;
864 }
865
866 _count++;
867 }
868
869 static jint get_vm_thread_count() {
870 VmThreadCountClosure vmtcc;
871 {
872 MutexLocker ml(Threads_lock);
873 Threads::threads_do(&vmtcc);
874 }
875
876 return vmtcc.count();
877 }
878
879 static jint get_num_flags() {
880 // last flag entry is always null, so subtract 1
881 int nFlags = (int) JVMFlag::numFlags - 1;
882 int count = 0;
883 for (int i = 0; i < nFlags; i++) {
884 JVMFlag* flag = &JVMFlag::flags[i];
885 // Exclude the locked (diagnostic, experimental) flags
886 if (flag->is_unlocked() || flag->is_unlocker()) {
887 count++;
888 }
889 }
890 return count;
891 }
892
893 static jlong get_gc_cpu_time() {
894 if (!os::is_thread_cpu_time_supported()) {
895 return -1;
896 }
897
898 {
899 MutexLocker hl(Heap_lock);
900 if (Universe::heap()->is_shutting_down()) {
901 return -1;
902 }
903
904 return CPUTimeUsage::GC::total();
905 }
906 }
907
908 static jlong get_long_attribute(jmmLongAttribute att) {
909 switch (att) {
910 case JMM_CLASS_LOADED_COUNT:
911 return ClassLoadingService::loaded_class_count();
912
913 case JMM_CLASS_UNLOADED_COUNT:
914 return ClassLoadingService::unloaded_class_count();
915
916 case JMM_THREAD_TOTAL_COUNT:
917 return ThreadService::get_total_thread_count();
918
919 case JMM_THREAD_LIVE_COUNT:
920 return ThreadService::get_live_thread_count();
921
922 case JMM_THREAD_PEAK_COUNT:
923 return ThreadService::get_peak_thread_count();
924
925 case JMM_THREAD_DAEMON_COUNT:
926 return ThreadService::get_daemon_thread_count();
927
928 case JMM_JVM_INIT_DONE_TIME_MS:
929 return Management::vm_init_done_time();
930
931 case JMM_JVM_UPTIME_MS:
932 return Management::ticks_to_ms(os::elapsed_counter());
933
934 case JMM_TOTAL_GC_CPU_TIME:
935 return get_gc_cpu_time();
936
937 case JMM_COMPILE_TOTAL_TIME_MS:
938 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
939
940 case JMM_OS_PROCESS_ID:
941 return os::current_process_id();
942
943 // Hotspot-specific counters
944 case JMM_CLASS_LOADED_BYTES:
945 return ClassLoadingService::loaded_class_bytes();
946
947 case JMM_CLASS_UNLOADED_BYTES:
948 return ClassLoadingService::unloaded_class_bytes();
949
950 case JMM_SHARED_CLASS_LOADED_COUNT:
951 return ClassLoadingService::loaded_shared_class_count();
952
953 case JMM_SHARED_CLASS_UNLOADED_COUNT:
954 return ClassLoadingService::unloaded_shared_class_count();
955
956
957 case JMM_SHARED_CLASS_LOADED_BYTES:
958 return ClassLoadingService::loaded_shared_class_bytes();
959
960 case JMM_SHARED_CLASS_UNLOADED_BYTES:
961 return ClassLoadingService::unloaded_shared_class_bytes();
962
963 case JMM_TOTAL_CLASSLOAD_TIME_MS:
964 return ClassLoader::classloader_time_ms();
965
966 case JMM_VM_GLOBAL_COUNT:
967 return get_num_flags();
968
969 case JMM_SAFEPOINT_COUNT:
970 return RuntimeService::safepoint_count();
971
972 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
973 return RuntimeService::safepoint_sync_time_ms();
974
975 case JMM_TOTAL_STOPPED_TIME_MS:
976 return RuntimeService::safepoint_time_ms();
977
978 case JMM_TOTAL_APP_TIME_MS:
979 return RuntimeService::application_time_ms();
980
981 case JMM_VM_THREAD_COUNT:
982 return get_vm_thread_count();
983
984 case JMM_CLASS_INIT_TOTAL_COUNT:
985 return ClassLoader::class_init_count();
986
987 case JMM_CLASS_INIT_TOTAL_TIME_MS:
988 return ClassLoader::class_init_time_ms();
989
990 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
991 return ClassLoader::class_verify_time_ms();
992
993 case JMM_METHOD_DATA_SIZE_BYTES:
994 return ClassLoadingService::class_method_data_size();
995
996 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
997 return static_cast<jlong>(os::physical_memory());
998
999 default:
1000 return -1;
1001 }
1002 }
1003
1004
1005 // Returns the long value of a given attribute.
1006 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
1007 if (obj == nullptr) {
1008 return get_long_attribute(att);
1009 } else {
1010 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
1011 if (mgr != nullptr) {
1012 return get_gc_attribute(mgr, att);
1013 }
1014 }
1015 return -1;
1016 JVM_END
1017
1018 // Gets the value of all attributes specified in the given array
1019 // and sets the value in the result array.
1020 // Returns the number of attributes found.
1021 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
1022 jobject obj,
1023 jmmLongAttribute* atts,
1024 jint count,
1025 jlong* result))
1026
1027 int num_atts = 0;
1028 if (obj == nullptr) {
1029 for (int i = 0; i < count; i++) {
1030 result[i] = get_long_attribute(atts[i]);
1031 if (result[i] != -1) {
1032 num_atts++;
1033 }
1034 }
1035 } else {
1036 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1037 for (int i = 0; i < count; i++) {
1038 result[i] = get_gc_attribute(mgr, atts[i]);
1039 if (result[i] != -1) {
1040 num_atts++;
1041 }
1042 }
1043 }
1044 return num_atts;
1045 JVM_END
1046
1047 // Helper function to do thread dump for a specific list of threads
1048 static void do_thread_dump(ThreadDumpResult* dump_result,
1049 typeArrayHandle ids_ah, // array of thread ID (long[])
1050 int num_threads,
1051 int max_depth,
1052 bool with_locked_monitors,
1053 bool with_locked_synchronizers,
1054 TRAPS) {
1055 // no need to actually perform thread dump if no TIDs are specified
1056 if (num_threads == 0) return;
1057
1058 // First get an array of threadObj handles.
1059 // A JavaThread may terminate before we get the stack trace.
1060 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1061
1062 {
1063 // Need this ThreadsListHandle for converting Java thread IDs into
1064 // threadObj handles; dump_result->set_t_list() is called in the
1065 // VM op below so we can't use it yet.
1066 ThreadsListHandle tlh;
1067 for (int i = 0; i < num_threads; i++) {
1068 jlong tid = ids_ah->long_at(i);
1069 JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1070 oop thread_obj = is_platform_thread(jt) ? jt->threadObj() : (oop)nullptr;
1071 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1072 thread_handle_array->append(threadObj_h);
1073 }
1074 }
1075
1076 // Obtain thread dumps and thread snapshot information
1077 VM_ThreadDump op(dump_result,
1078 thread_handle_array,
1079 num_threads,
1080 max_depth, /* stack depth */
1081 with_locked_monitors,
1082 with_locked_synchronizers);
1083 VMThread::execute(&op);
1084 }
1085
1086 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1087 // for the thread ID specified in the corresponding entry in
1088 // the given array of thread IDs; or null if the thread does not exist
1089 // or has terminated.
1090 //
1091 // Input parameters:
1092 // ids - array of thread IDs
1093 // maxDepth - the maximum depth of stack traces to be dumped:
1094 // maxDepth == -1 requests to dump entire stack trace.
1095 // maxDepth == 0 requests no stack trace.
1096 // infoArray - array of ThreadInfo objects
1097 //
1098 // QQQ - Why does this method return a value instead of void?
1099 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1100 // Check if threads is null
1101 if (ids == nullptr || infoArray == nullptr) {
1102 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1103 }
1104
1105 if (maxDepth < -1) {
1106 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1107 "Invalid maxDepth", -1);
1108 }
1109
1110 ResourceMark rm(THREAD);
1111 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1112 typeArrayHandle ids_ah(THREAD, ta);
1113
1114 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1115 objArrayOop oa = objArrayOop(infoArray_obj);
1116 objArrayHandle infoArray_h(THREAD, oa);
1117
1118 // validate the thread id array
1119 validate_thread_id_array(ids_ah, CHECK_0);
1120
1121 // validate the ThreadInfo[] parameters
1122 validate_thread_info_array(infoArray_h, CHECK_0);
1123
1124 // infoArray must be of the same length as the given array of thread IDs
1125 int num_threads = ids_ah->length();
1126 if (num_threads != infoArray_h->length()) {
1127 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1128 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1129 }
1130
1131 // Must use ThreadDumpResult to store the ThreadSnapshot.
1132 // GC may occur after the thread snapshots are taken but before
1133 // this function returns. The threadObj and other oops kept
1134 // in the ThreadSnapshot are marked and adjusted during GC.
1135 ThreadDumpResult dump_result(num_threads);
1136
1137 if (maxDepth == 0) {
1138 // No stack trace to dump so we do not need to stop the world.
1139 // Since we never do the VM op here we must set the threads list.
1140 dump_result.set_t_list();
1141 for (int i = 0; i < num_threads; i++) {
1142 jlong tid = ids_ah->long_at(i);
1143 JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1144 if (jt == nullptr) {
1145 // if the thread does not exist or now it is terminated,
1146 // create dummy snapshot
1147 dump_result.add_thread_snapshot();
1148 } else {
1149 dump_result.add_thread_snapshot(jt);
1150 }
1151 }
1152 } else {
1153 // obtain thread dump with the specific list of threads with stack trace
1154 do_thread_dump(&dump_result,
1155 ids_ah,
1156 num_threads,
1157 maxDepth,
1158 false, /* no locked monitor */
1159 false, /* no locked synchronizers */
1160 CHECK_0);
1161 }
1162
1163 int num_snapshots = dump_result.num_snapshots();
1164 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1165 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1166 int index = 0;
1167 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != nullptr; index++, ts = ts->next()) {
1168 // For each thread, create an java/lang/management/ThreadInfo object
1169 // and fill with the thread information
1170
1171 if (!is_platform_thread(ts)) {
1172 // if the thread does not exist, has terminated, or is a virtual thread, then set threadinfo to null
1173 infoArray_h->obj_at_put(index, nullptr);
1174 continue;
1175 }
1176
1177 // Create java.lang.management.ThreadInfo object
1178 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1179 infoArray_h->obj_at_put(index, info_obj);
1180 }
1181 return 0;
1182 JVM_END
1183
1184 // Dump thread info for the specified threads.
1185 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1186 // for the thread ID specified in the corresponding entry in
1187 // the given array of thread IDs; or null if the thread does not exist
1188 // or has terminated.
1189 //
1190 // Input parameter:
1191 // ids - array of thread IDs; null indicates all live threads
1192 // locked_monitors - if true, dump locked object monitors
1193 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1194 //
1195 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1196 jboolean locked_synchronizers, jint maxDepth))
1197 ResourceMark rm(THREAD);
1198
1199 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1200 int num_threads = (ta != nullptr ? ta->length() : 0);
1201 typeArrayHandle ids_ah(THREAD, ta);
1202
1203 ThreadDumpResult dump_result(num_threads); // can safepoint
1204
1205 if (ids_ah() != nullptr) {
1206
1207 // validate the thread id array
1208 validate_thread_id_array(ids_ah, CHECK_NULL);
1209
1210 // obtain thread dump of a specific list of threads
1211 do_thread_dump(&dump_result,
1212 ids_ah,
1213 num_threads,
1214 maxDepth, /* stack depth */
1215 (locked_monitors ? true : false), /* with locked monitors */
1216 (locked_synchronizers ? true : false), /* with locked synchronizers */
1217 CHECK_NULL);
1218 } else {
1219 // obtain thread dump of all threads
1220 VM_ThreadDump op(&dump_result,
1221 maxDepth, /* stack depth */
1222 (locked_monitors ? true : false), /* with locked monitors */
1223 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1224 VMThread::execute(&op);
1225 }
1226
1227 int num_snapshots = dump_result.num_snapshots();
1228 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1229
1230 // create the result ThreadInfo[] object
1231 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1232 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1233 objArrayHandle result_h(THREAD, r);
1234
1235 int index = 0;
1236 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != nullptr; ts = ts->next(), index++) {
1237 if (!is_platform_thread(ts)) {
1238 // if the thread does not exist, has terminated, or is a virtual thread, then set threadinfo to null
1239 result_h->obj_at_put(index, nullptr);
1240 continue;
1241 }
1242
1243 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1244 assert(stacktrace != nullptr, "Must have a stack trace dumped");
1245
1246 // Create Object[] filled with locked monitors
1247 // Create int[] filled with the stack depth where a monitor was locked
1248 int num_frames = stacktrace->get_stack_depth();
1249 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1250
1251 // Count the total number of locked monitors
1252 for (int i = 0; i < num_frames; i++) {
1253 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1254 num_locked_monitors += frame->num_locked_monitors();
1255 }
1256
1257 objArrayHandle monitors_array;
1258 typeArrayHandle depths_array;
1259 objArrayHandle synchronizers_array;
1260
1261 if (locked_monitors) {
1262 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1263 // where the thread locked it
1264 objArrayOop array = oopFactory::new_objArray(vmClasses::Object_klass(), num_locked_monitors, CHECK_NULL);
1265 objArrayHandle mh(THREAD, array);
1266 monitors_array = mh;
1267
1268 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1269 typeArrayHandle dh(THREAD, tarray);
1270 depths_array = dh;
1271
1272 int count = 0;
1273 int j = 0;
1274 for (int depth = 0; depth < num_frames; depth++) {
1275 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1276 int len = frame->num_locked_monitors();
1277 GrowableArray<OopHandle>* locked_monitors = frame->locked_monitors();
1278 for (j = 0; j < len; j++) {
1279 oop monitor = locked_monitors->at(j).resolve();
1280 assert(monitor != nullptr, "must be a Java object");
1281 monitors_array->obj_at_put(count, monitor);
1282 depths_array->int_at_put(count, depth);
1283 count++;
1284 }
1285 }
1286
1287 GrowableArray<OopHandle>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1288 for (j = 0; j < jni_locked_monitors->length(); j++) {
1289 oop object = jni_locked_monitors->at(j).resolve();
1290 assert(object != nullptr, "must be a Java object");
1291 monitors_array->obj_at_put(count, object);
1292 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1293 depths_array->int_at_put(count, -1);
1294 count++;
1295 }
1296 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1297 }
1298
1299 if (locked_synchronizers) {
1300 // Create Object[] filled with locked JSR-166 synchronizers
1301 assert(ts->threadObj() != nullptr, "Must be a valid JavaThread");
1302 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1303 GrowableArray<OopHandle>* locks = (tcl != nullptr ? tcl->owned_locks() : nullptr);
1304 int num_locked_synchronizers = (locks != nullptr ? locks->length() : 0);
1305
1306 objArrayOop array = oopFactory::new_objArray(vmClasses::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1307 objArrayHandle sh(THREAD, array);
1308 synchronizers_array = sh;
1309
1310 for (int k = 0; k < num_locked_synchronizers; k++) {
1311 synchronizers_array->obj_at_put(k, locks->at(k).resolve());
1312 }
1313 }
1314
1315 // Create java.lang.management.ThreadInfo object
1316 instanceOop info_obj = Management::create_thread_info_instance(ts,
1317 monitors_array,
1318 depths_array,
1319 synchronizers_array,
1320 CHECK_NULL);
1321 result_h->obj_at_put(index, info_obj);
1322 }
1323
1324 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
1325 JVM_END
1326
1327 // Reset statistic. Return true if the requested statistic is reset.
1328 // Otherwise, return false.
1329 //
1330 // Input parameters:
1331 // obj - specify which instance the statistic associated with to be reset
1332 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1333 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1334 // type - the type of statistic to be reset
1335 //
1336 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1337 ResourceMark rm(THREAD);
1338
1339 switch (type) {
1340 case JMM_STAT_PEAK_THREAD_COUNT:
1341 ThreadService::reset_peak_thread_count();
1342 return true;
1343
1344 case JMM_STAT_THREAD_CONTENTION_COUNT:
1345 case JMM_STAT_THREAD_CONTENTION_TIME: {
1346 jlong tid = obj.j;
1347 if (tid < 0) {
1348 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1349 }
1350
1351 // Look for the JavaThread of this given tid
1352 JavaThreadIteratorWithHandle jtiwh;
1353 if (tid == 0) {
1354 // reset contention statistics for all threads if tid == 0
1355 for (; JavaThread *java_thread = jtiwh.next(); ) {
1356 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1357 ThreadService::reset_contention_count_stat(java_thread);
1358 } else {
1359 ThreadService::reset_contention_time_stat(java_thread);
1360 }
1361 }
1362 } else {
1363 // reset contention statistics for a given thread
1364 JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1365 if (java_thread == nullptr) {
1366 return false;
1367 }
1368
1369 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1370 ThreadService::reset_contention_count_stat(java_thread);
1371 } else {
1372 ThreadService::reset_contention_time_stat(java_thread);
1373 }
1374 }
1375 return true;
1376 break;
1377 }
1378 case JMM_STAT_PEAK_POOL_USAGE: {
1379 jobject o = obj.l;
1380 if (o == nullptr) {
1381 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1382 }
1383
1384 oop pool_obj = JNIHandles::resolve(o);
1385 assert(pool_obj->is_instance(), "Should be an instanceOop");
1386 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1387
1388 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1389 if (pool != nullptr) {
1390 pool->reset_peak_memory_usage();
1391 return true;
1392 }
1393 break;
1394 }
1395 case JMM_STAT_GC_STAT: {
1396 jobject o = obj.l;
1397 if (o == nullptr) {
1398 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1399 }
1400
1401 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_false);
1402 if (mgr != nullptr) {
1403 mgr->reset_gc_stat();
1404 return true;
1405 }
1406 break;
1407 }
1408 default:
1409 assert(0, "Unknown Statistic Type");
1410 }
1411 return false;
1412 JVM_END
1413
1414 // Returns the fast estimate of CPU time consumed by
1415 // a given thread (in nanoseconds).
1416 // If thread_id == 0, return CPU time for the current thread.
1417 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1418 if (!os::is_thread_cpu_time_supported()) {
1419 return -1;
1420 }
1421
1422 if (thread_id < 0) {
1423 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1424 "Invalid thread ID", -1);
1425 }
1426
1427 JavaThread* java_thread = nullptr;
1428 if (thread_id == 0) {
1429 // current thread
1430 return os::current_thread_cpu_time();
1431 } else {
1432 ThreadsListHandle tlh;
1433 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1434 if (is_platform_thread(java_thread)) {
1435 return os::thread_cpu_time((Thread*) java_thread);
1436 }
1437 }
1438 return -1;
1439 JVM_END
1440
1441 // Returns a String array of all VM global flag names
1442 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1443 // last flag entry is always null, so subtract 1
1444 int nFlags = (int) JVMFlag::numFlags - 1;
1445 // allocate a temp array
1446 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(),
1447 nFlags, CHECK_NULL);
1448 objArrayHandle flags_ah(THREAD, r);
1449 int num_entries = 0;
1450 for (int i = 0; i < nFlags; i++) {
1451 JVMFlag* flag = &JVMFlag::flags[i];
1452 // Exclude develop flags in product builds.
1453 if (flag->is_constant_in_binary()) {
1454 continue;
1455 }
1456 // Exclude the locked (experimental, diagnostic) flags
1457 if (flag->is_unlocked() || flag->is_unlocker()) {
1458 Handle s = java_lang_String::create_from_str(flag->name(), CHECK_NULL);
1459 flags_ah->obj_at_put(num_entries, s());
1460 num_entries++;
1461 }
1462 }
1463
1464 if (num_entries < nFlags) {
1465 // Return array of right length
1466 objArrayOop res = oopFactory::new_objArray(vmClasses::String_klass(), num_entries, CHECK_NULL);
1467 for(int i = 0; i < num_entries; i++) {
1468 res->obj_at_put(i, flags_ah->obj_at(i));
1469 }
1470 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1471 }
1472
1473 return (jobjectArray)JNIHandles::make_local(THREAD, flags_ah());
1474 JVM_END
1475
1476 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1477 // can't be determined, true otherwise. If false is returned, then *global
1478 // will be incomplete and invalid.
1479 static bool add_global_entry(Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {
1480 Handle flag_name;
1481 if (name() == nullptr) {
1482 flag_name = java_lang_String::create_from_str(flag->name(), CHECK_false);
1483 } else {
1484 flag_name = name;
1485 }
1486 global->name = (jstring)JNIHandles::make_local(THREAD, flag_name());
1487
1488 if (flag->is_bool()) {
1489 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1490 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1491 } else if (flag->is_int()) {
1492 global->value.j = (jlong)flag->get_int();
1493 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1494 } else if (flag->is_uint()) {
1495 global->value.j = (jlong)flag->get_uint();
1496 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1497 } else if (flag->is_intx()) {
1498 global->value.j = (jlong)flag->get_intx();
1499 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1500 } else if (flag->is_uintx()) {
1501 global->value.j = (jlong)flag->get_uintx();
1502 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1503 } else if (flag->is_uint64_t()) {
1504 global->value.j = (jlong)flag->get_uint64_t();
1505 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1506 } else if (flag->is_double()) {
1507 global->value.d = (jdouble)flag->get_double();
1508 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1509 } else if (flag->is_size_t()) {
1510 global->value.j = (jlong)flag->get_size_t();
1511 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1512 } else if (flag->is_ccstr()) {
1513 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1514 global->value.l = (jobject)JNIHandles::make_local(THREAD, str());
1515 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1516 } else {
1517 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1518 return false;
1519 }
1520
1521 global->writeable = flag->is_writeable();
1522 global->external = flag->is_external();
1523 switch (flag->get_origin()) {
1524 case JVMFlagOrigin::DEFAULT:
1525 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1526 break;
1527 case JVMFlagOrigin::COMMAND_LINE:
1528 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1529 break;
1530 case JVMFlagOrigin::ENVIRON_VAR:
1531 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1532 break;
1533 case JVMFlagOrigin::CONFIG_FILE:
1534 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1535 break;
1536 case JVMFlagOrigin::MANAGEMENT:
1537 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1538 break;
1539 case JVMFlagOrigin::ERGONOMIC:
1540 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1541 break;
1542 case JVMFlagOrigin::ATTACH_ON_DEMAND:
1543 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1544 break;
1545 default:
1546 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1547 }
1548
1549 return true;
1550 }
1551
1552 // Fill globals array of count length with jmmVMGlobal entries
1553 // specified by names. If names == null, fill globals array
1554 // with all Flags. Return value is number of entries
1555 // created in globals.
1556 // If a JVMFlag with a given name in an array element does not
1557 // exist, globals[i].name will be set to null.
1558 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1559 jobjectArray names,
1560 jmmVMGlobal *globals,
1561 jint count))
1562
1563
1564 if (globals == nullptr) {
1565 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1566 }
1567
1568 ResourceMark rm(THREAD);
1569
1570 if (names != nullptr) {
1571 // return the requested globals
1572 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1573 objArrayHandle names_ah(THREAD, ta);
1574 // Make sure we have a String array
1575 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1576 if (element_klass != vmClasses::String_klass()) {
1577 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1578 "Array element type is not String class", 0);
1579 }
1580
1581 int names_length = names_ah->length();
1582 int num_entries = 0;
1583 for (int i = 0; i < names_length && i < count; i++) {
1584 oop s = names_ah->obj_at(i);
1585 if (s == nullptr) {
1586 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1587 }
1588
1589 Handle sh(THREAD, s);
1590 char* str = java_lang_String::as_utf8_string(s);
1591 JVMFlag* flag = JVMFlag::find_flag(str);
1592 if (flag != nullptr &&
1593 add_global_entry(sh, &globals[i], flag, THREAD)) {
1594 num_entries++;
1595 } else {
1596 globals[i].name = nullptr;
1597 }
1598 }
1599 return num_entries;
1600 } else {
1601 // return all globals if names == null
1602
1603 // last flag entry is always null, so subtract 1
1604 int nFlags = (int) JVMFlag::numFlags - 1;
1605 Handle null_h;
1606 int num_entries = 0;
1607 for (int i = 0; i < nFlags && num_entries < count; i++) {
1608 JVMFlag* flag = &JVMFlag::flags[i];
1609 // Exclude develop flags in product builds.
1610 if (flag->is_constant_in_binary()) {
1611 continue;
1612 }
1613 // Exclude the locked (diagnostic, experimental) flags
1614 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1615 add_global_entry(null_h, &globals[num_entries], flag, THREAD)) {
1616 num_entries++;
1617 }
1618 }
1619 return num_entries;
1620 }
1621 JVM_END
1622
1623 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1624 ResourceMark rm(THREAD);
1625
1626 oop fn = JNIHandles::resolve_external_guard(flag_name);
1627 if (fn == nullptr) {
1628 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1629 "The flag name cannot be null.");
1630 }
1631 char* name = java_lang_String::as_utf8_string(fn);
1632
1633 FormatBuffer<80> error_msg("%s", "");
1634 int succeed = WriteableFlags::set_flag(name, new_value, JVMFlagOrigin::MANAGEMENT, error_msg);
1635
1636 if (succeed != JVMFlag::SUCCESS) {
1637 if (succeed == JVMFlag::MISSING_VALUE) {
1638 // missing value causes NPE to be thrown
1639 THROW(vmSymbols::java_lang_NullPointerException());
1640 } else {
1641 // all the other errors are reported as IAE with the appropriate error message
1642 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1643 error_msg.buffer());
1644 }
1645 }
1646 assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1647 JVM_END
1648
1649 class ThreadTimesClosure: public ThreadClosure {
1650 private:
1651 objArrayHandle _names_strings;
1652 char **_names_chars;
1653 typeArrayHandle _times;
1654 int _names_len;
1655 int _times_len;
1656 int _count;
1657
1658 public:
1659 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1660 ~ThreadTimesClosure();
1661 virtual void do_thread(Thread* thread);
1662 void do_unlocked(TRAPS);
1663 int count() { return _count; }
1664 };
1665
1666 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1667 typeArrayHandle times) {
1668 assert(names() != nullptr, "names was null");
1669 assert(times() != nullptr, "times was null");
1670 _names_strings = names;
1671 _names_len = names->length();
1672 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1673 _times = times;
1674 _times_len = times->length();
1675 _count = 0;
1676 }
1677
1678 //
1679 // Called with Threads_lock held
1680 //
1681 void ThreadTimesClosure::do_thread(Thread* thread) {
1682 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
1683 assert(thread != nullptr, "thread was null");
1684
1685 // exclude externally visible JavaThreads
1686 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1687 return;
1688 }
1689
1690 if (_count >= _names_len || _count >= _times_len) {
1691 // skip if the result array is not big enough
1692 return;
1693 }
1694
1695 ResourceMark rm; // thread->name() uses ResourceArea
1696
1697 assert(thread->name() != nullptr, "All threads should have a name");
1698 _names_chars[_count] = os::strdup_check_oom(thread->name());
1699 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1700 os::thread_cpu_time(thread) : -1);
1701 _count++;
1702 }
1703
1704 // Called without Threads_lock, we can allocate String objects.
1705 void ThreadTimesClosure::do_unlocked(TRAPS) {
1706
1707 for (int i = 0; i < _count; i++) {
1708 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1709 _names_strings->obj_at_put(i, s());
1710 }
1711 }
1712
1713 ThreadTimesClosure::~ThreadTimesClosure() {
1714 for (int i = 0; i < _count; i++) {
1715 os::free(_names_chars[i]);
1716 }
1717 FREE_C_HEAP_ARRAY(char *, _names_chars);
1718 }
1719
1720 // Fills names with VM internal thread names and times with the corresponding
1721 // CPU times. If names or times is null, a NullPointerException is thrown.
1722 // If the element type of names is not String, an IllegalArgumentException is
1723 // thrown.
1724 // If an array is not large enough to hold all the entries, only the entries
1725 // that fit will be returned. Return value is the number of VM internal
1726 // threads entries.
1727 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1728 jobjectArray names,
1729 jlongArray times))
1730 if (names == nullptr || times == nullptr) {
1731 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1732 }
1733 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1734 objArrayHandle names_ah(THREAD, na);
1735
1736 // Make sure we have a String array
1737 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1738 if (element_klass != vmClasses::String_klass()) {
1739 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1740 "Array element type is not String class", 0);
1741 }
1742
1743 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1744 typeArrayHandle times_ah(THREAD, ta);
1745
1746 ThreadTimesClosure ttc(names_ah, times_ah);
1747 {
1748 MutexLocker ml(THREAD, Threads_lock);
1749 Threads::threads_do(&ttc);
1750 }
1751 ttc.do_unlocked(THREAD);
1752 return ttc.count();
1753 JVM_END
1754
1755 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1756 ResourceMark rm(THREAD);
1757
1758 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1759 VMThread::execute(&op);
1760
1761 DeadlockCycle* deadlocks = op.result();
1762 if (deadlocks == nullptr) {
1763 // no deadlock found and return
1764 return Handle();
1765 }
1766
1767 int num_threads = 0;
1768 DeadlockCycle* cycle;
1769 for (cycle = deadlocks; cycle != nullptr; cycle = cycle->next()) {
1770 num_threads += cycle->num_threads();
1771 }
1772
1773 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NH);
1774 objArrayHandle threads_ah(THREAD, r);
1775
1776 int index = 0;
1777 for (cycle = deadlocks; cycle != nullptr; cycle = cycle->next()) {
1778 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1779 int len = deadlock_threads->length();
1780 for (int i = 0; i < len; i++) {
1781 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1782 index++;
1783 }
1784 }
1785 return threads_ah;
1786 }
1787
1788 // Finds cycles of threads that are deadlocked involved in object monitors
1789 // and JSR-166 synchronizers.
1790 // Returns an array of Thread objects which are in deadlock, if any.
1791 // Otherwise, returns null.
1792 //
1793 // Input parameter:
1794 // object_monitors_only - if true, only check object monitors
1795 //
1796 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1797 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_NULL);
1798 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1799 JVM_END
1800
1801 // Finds cycles of threads that are deadlocked on monitor locks
1802 // Returns an array of Thread objects which are in deadlock, if any.
1803 // Otherwise, returns null.
1804 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1805 Handle result = find_deadlocks(true, CHECK_NULL);
1806 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1807 JVM_END
1808
1809 // Gets the information about GC extension attributes including
1810 // the name of the attribute, its type, and a short description.
1811 //
1812 // Input parameters:
1813 // mgr - GC memory manager
1814 // info - caller allocated array of jmmExtAttributeInfo
1815 // count - number of elements of the info array
1816 //
1817 // Returns the number of GC extension attributes filled in the info array; or
1818 // -1 if info is not big enough
1819 //
1820 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1821 // All GC memory managers have 1 attribute (number of GC threads)
1822 if (count == 0) {
1823 return 0;
1824 }
1825
1826 if (info == nullptr) {
1827 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1828 }
1829
1830 info[0].name = "GcThreadCount";
1831 info[0].type = 'I';
1832 info[0].description = "Number of GC threads";
1833 return 1;
1834 JVM_END
1835
1836 // verify the given array is an array of java/lang/management/MemoryUsage objects
1837 // of a given length and return the objArrayOop
1838 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1839 if (array == nullptr) {
1840 THROW_NULL(vmSymbols::java_lang_NullPointerException());
1841 }
1842
1843 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1844 objArrayHandle array_h(THREAD, oa);
1845
1846 // array must be of the given length
1847 if (length != array_h->length()) {
1848 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1849 "The length of the given MemoryUsage array does not match the number of memory pools.");
1850 }
1851
1852 // check if the element of array is of type MemoryUsage class
1853 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_NULL);
1854 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1855 if (element_klass != usage_klass) {
1856 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1857 "The element type is not MemoryUsage class");
1858 }
1859
1860 return array_h();
1861 }
1862
1863 // Gets the statistics of the last GC of a given GC memory manager.
1864 // Input parameters:
1865 // obj - GarbageCollectorMXBean object
1866 // gc_stat - caller allocated jmmGCStat where:
1867 // a. before_gc_usage - array of MemoryUsage objects
1868 // b. after_gc_usage - array of MemoryUsage objects
1869 // c. gc_ext_attributes_values_size is set to the
1870 // gc_ext_attribute_values array allocated
1871 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1872 //
1873 // On return,
1874 // gc_index == 0 indicates no GC statistics available
1875 //
1876 // before_gc_usage and after_gc_usage - filled with per memory pool
1877 // before and after GC usage in the same order as the memory pools
1878 // returned by GetMemoryPools for a given GC memory manager.
1879 // num_gc_ext_attributes indicates the number of elements in
1880 // the gc_ext_attribute_values array is filled; or
1881 // -1 if the gc_ext_attributes_values array is not big enough
1882 //
1883 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1884 ResourceMark rm(THREAD);
1885
1886 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == nullptr) {
1887 THROW(vmSymbols::java_lang_NullPointerException());
1888 }
1889
1890 // Get the GCMemoryManager
1891 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1892
1893 // Make a copy of the last GC statistics
1894 // GC may occur while constructing the last GC information
1895 int num_pools = MemoryService::num_memory_pools();
1896 GCStatInfo stat(num_pools);
1897 if (mgr->get_last_gc_stat(&stat) == 0) {
1898 gc_stat->gc_index = 0;
1899 return;
1900 }
1901
1902 gc_stat->gc_index = stat.gc_index();
1903 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1904 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1905
1906 // Current implementation does not have GC extension attributes
1907 gc_stat->num_gc_ext_attributes = 0;
1908
1909 // Fill the arrays of MemoryUsage objects with before and after GC
1910 // per pool memory usage
1911 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1912 num_pools,
1913 CHECK);
1914 objArrayHandle usage_before_gc_ah(THREAD, bu);
1915
1916 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1917 num_pools,
1918 CHECK);
1919 objArrayHandle usage_after_gc_ah(THREAD, au);
1920
1921 for (int i = 0; i < num_pools; i++) {
1922 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1923 Handle after_usage;
1924
1925 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1926 if (u.max_size() == 0 && u.used() > 0) {
1927 // If max size == 0, this pool is a survivor space.
1928 // Set max size = -1 since the pools will be swapped after GC.
1929 MemoryUsage usage(u.init_size(), u.used(), u.committed(), MemoryUsage::undefined_size());
1930 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1931 } else {
1932 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1933 }
1934 usage_before_gc_ah->obj_at_put(i, before_usage());
1935 usage_after_gc_ah->obj_at_put(i, after_usage());
1936 }
1937
1938 if (gc_stat->gc_ext_attribute_values_size > 0) {
1939 // Current implementation only has 1 attribute (number of GC threads)
1940 // The type is 'I'
1941 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1942 }
1943 JVM_END
1944
1945 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1946 ResourceMark rm(THREAD);
1947 // Get the GCMemoryManager
1948 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1949 mgr->set_notification_enabled(enabled?true:false);
1950 JVM_END
1951
1952 // Dump heap - Returns 0 if succeeds.
1953 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1954 #if INCLUDE_SERVICES
1955 ResourceMark rm(THREAD);
1956 oop on = JNIHandles::resolve_external_guard(outputfile);
1957 if (on == nullptr) {
1958 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1959 "Output file name cannot be null.", -1);
1960 }
1961 Handle onhandle(THREAD, on);
1962 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1963 if (name == nullptr) {
1964 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1965 "Output file name cannot be null.", -1);
1966 }
1967 HeapDumper dumper(live ? true : false);
1968 if (dumper.dump(name) != 0) {
1969 const char* errmsg = dumper.error_as_C_string();
1970 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1971 }
1972 return 0;
1973 #else // INCLUDE_SERVICES
1974 return -1;
1975 #endif // INCLUDE_SERVICES
1976 JVM_END
1977
1978 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1979 ResourceMark rm(THREAD);
1980 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1981 objArrayOop cmd_array_oop = oopFactory::new_objArray(vmClasses::String_klass(),
1982 dcmd_list->length(), CHECK_NULL);
1983 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1984 for (int i = 0; i < dcmd_list->length(); i++) {
1985 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1986 cmd_array->obj_at_put(i, cmd_name);
1987 }
1988 return (jobjectArray) JNIHandles::make_local(THREAD, cmd_array());
1989 JVM_END
1990
1991 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1992 dcmdInfo* infoArray))
1993 if (cmds == nullptr || infoArray == nullptr) {
1994 THROW(vmSymbols::java_lang_NullPointerException());
1995 }
1996
1997 ResourceMark rm(THREAD);
1998
1999 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
2000 objArrayHandle cmds_ah(THREAD, ca);
2001
2002 // Make sure we have a String array
2003 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
2004 if (element_klass != vmClasses::String_klass()) {
2005 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2006 "Array element type is not String class");
2007 }
2008
2009 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
2010
2011 int num_cmds = cmds_ah->length();
2012 for (int i = 0; i < num_cmds; i++) {
2013 oop cmd = cmds_ah->obj_at(i);
2014 if (cmd == nullptr) {
2015 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2016 "Command name cannot be null.");
2017 }
2018 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2019 if (cmd_name == nullptr) {
2020 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2021 "Command name cannot be null.");
2022 }
2023 int pos = info_list->find_if([&](DCmdInfo* info) {
2024 return info->name_equals(cmd_name);
2025 });
2026 if (pos == -1) {
2027 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2028 "Unknown diagnostic command");
2029 }
2030 DCmdInfo* info = info_list->at(pos);
2031 infoArray[i].name = info->name();
2032 infoArray[i].description = info->description();
2033 infoArray[i].impact = info->impact();
2034 infoArray[i].num_arguments = info->num_arguments();
2035
2036 // All registered DCmds are always enabled. We set the dcmdInfo::enabled
2037 // field to true to be compatible with the Java API
2038 // com.sun.management.internal.DiagnosticCommandInfo.
2039 infoArray[i].enabled = true;
2040 }
2041 JVM_END
2042
2043 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2044 jstring command, dcmdArgInfo* infoArray, jint count))
2045 ResourceMark rm(THREAD);
2046 oop cmd = JNIHandles::resolve_external_guard(command);
2047 if (cmd == nullptr) {
2048 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2049 "Command line cannot be null.");
2050 }
2051 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2052 if (cmd_name == nullptr) {
2053 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2054 "Command line content cannot be null.");
2055 }
2056 DCmd* dcmd = nullptr;
2057 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2058 strlen(cmd_name));
2059 if (factory != nullptr) {
2060 dcmd = factory->create_resource_instance(nullptr);
2061 }
2062 if (dcmd == nullptr) {
2063 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2064 "Unknown diagnostic command");
2065 }
2066 DCmdMark mark(dcmd);
2067 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2068 const int num_args = array->length();
2069 if (num_args != count) {
2070 assert(false, "jmm_GetDiagnosticCommandArgumentsInfo count mismatch (%d vs %d)", count, num_args);
2071 THROW_MSG(vmSymbols::java_lang_InternalError(), "jmm_GetDiagnosticCommandArgumentsInfo count mismatch");
2072 }
2073 for (int i = 0; i < num_args; i++) {
2074 infoArray[i].name = array->at(i)->name();
2075 infoArray[i].description = array->at(i)->description();
2076 infoArray[i].type = array->at(i)->type();
2077 infoArray[i].default_string = array->at(i)->default_string();
2078 infoArray[i].mandatory = array->at(i)->is_mandatory();
2079 infoArray[i].option = array->at(i)->is_option();
2080 infoArray[i].multiple = array->at(i)->is_multiple();
2081 infoArray[i].position = array->at(i)->position();
2082 }
2083 return;
2084 JVM_END
2085
2086 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2087 ResourceMark rm(THREAD);
2088 oop cmd = JNIHandles::resolve_external_guard(commandline);
2089 if (cmd == nullptr) {
2090 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2091 "Command line cannot be null.");
2092 }
2093 char* cmdline = java_lang_String::as_utf8_string(cmd);
2094 if (cmdline == nullptr) {
2095 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2096 "Command line content cannot be null.");
2097 }
2098 bufferedStream output;
2099 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2100 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2101 return (jstring) JNIHandles::make_local(THREAD, result);
2102 JVM_END
2103
2104 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2105 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2106 JVM_END
2107
2108 jlong Management::ticks_to_ms(jlong ticks) {
2109 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2110 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2111 * (double)1000.0);
2112 }
2113
2114 jlong Management::ticks_to_us(jlong ticks) {
2115 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2116 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2117 * (double)1000000.0);
2118 }
2119
2120 // Gets the amount of memory allocated on the Java heap since JVM launch.
2121 JVM_ENTRY(jlong, jmm_GetTotalThreadAllocatedMemory(JNIEnv *env))
2122 // A thread increments exited_allocated_bytes in ThreadService::remove_thread
2123 // only after it removes itself from the threads list, and once a TLH is
2124 // created, no thread it references can remove itself from the threads
2125 // list, so none can update exited_allocated_bytes. We therefore initialize
2126 // result with exited_allocated_bytes after after we create the TLH so that
2127 // the final result can only be short due to (1) threads that start after
2128 // the TLH is created, or (2) terminating threads that escape TLH creation
2129 // and don't update exited_allocated_bytes before we initialize result.
2130
2131 // We keep a high water mark to ensure monotonicity in case threads counted
2132 // on a previous call end up in state (2).
2133 static jlong high_water_result = 0;
2134
2135 JavaThreadIteratorWithHandle jtiwh;
2136 jlong result = ThreadService::exited_allocated_bytes();
2137 for (; JavaThread* thread = jtiwh.next();) {
2138 jlong size = thread->cooked_allocated_bytes();
2139 result += size;
2140 }
2141
2142 {
2143 assert(MonitoringSupport_lock != nullptr, "Must be");
2144 MutexLocker ml(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
2145 if (result < high_water_result) {
2146 // Encountered (2) above, or result wrapped to a negative value. In
2147 // the latter case, it's pegged at the last positive value.
2148 result = high_water_result;
2149 } else {
2150 high_water_result = result;
2151 }
2152 }
2153 return result;
2154 JVM_END
2155
2156 // Gets the amount of memory allocated on the Java heap for a single thread.
2157 // Returns -1 if the thread does not exist or has terminated.
2158 JVM_ENTRY(jlong, jmm_GetOneThreadAllocatedMemory(JNIEnv *env, jlong thread_id))
2159 if (thread_id < 0) {
2160 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2161 "Invalid thread ID", -1);
2162 }
2163
2164 if (thread_id == 0) { // current thread
2165 return thread->cooked_allocated_bytes();
2166 }
2167
2168 ThreadsListHandle tlh;
2169 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2170 if (is_platform_thread(java_thread)) {
2171 return java_thread->cooked_allocated_bytes();
2172 }
2173 return -1;
2174 JVM_END
2175
2176 // Gets an array containing the amount of memory allocated on the Java
2177 // heap for a set of threads (in bytes). Each element of the array is
2178 // the amount of memory allocated for the thread ID specified in the
2179 // corresponding entry in the given array of thread IDs; or -1 if the
2180 // thread does not exist or has terminated.
2181 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2182 jlongArray sizeArray))
2183 // Check if threads is null
2184 if (ids == nullptr || sizeArray == nullptr) {
2185 THROW(vmSymbols::java_lang_NullPointerException());
2186 }
2187
2188 ResourceMark rm(THREAD);
2189 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2190 typeArrayHandle ids_ah(THREAD, ta);
2191
2192 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2193 typeArrayHandle sizeArray_h(THREAD, sa);
2194
2195 // validate the thread id array
2196 validate_thread_id_array(ids_ah, CHECK);
2197
2198 // sizeArray must be of the same length as the given array of thread IDs
2199 int num_threads = ids_ah->length();
2200 if (num_threads != sizeArray_h->length()) {
2201 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2202 "The length of the given long array does not match the length of "
2203 "the given array of thread IDs");
2204 }
2205
2206 ThreadsListHandle tlh;
2207 for (int i = 0; i < num_threads; i++) {
2208 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2209 if (is_platform_thread(java_thread)) {
2210 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2211 }
2212 }
2213 JVM_END
2214
2215 // Returns the CPU time consumed by a given thread (in nanoseconds).
2216 // If thread_id == 0, CPU time for the current thread is returned.
2217 // If user_sys_cpu_time = true, user level and system CPU time of
2218 // a given thread is returned; otherwise, only user level CPU time
2219 // is returned.
2220 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2221 if (!os::is_thread_cpu_time_supported()) {
2222 return -1;
2223 }
2224
2225 if (thread_id < 0) {
2226 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2227 "Invalid thread ID", -1);
2228 }
2229
2230 JavaThread* java_thread = nullptr;
2231 if (thread_id == 0) {
2232 // current thread
2233 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2234 } else {
2235 ThreadsListHandle tlh;
2236 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2237 if (is_platform_thread(java_thread)) {
2238 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2239 }
2240 }
2241 return -1;
2242 JVM_END
2243
2244 // Gets an array containing the CPU times consumed by a set of threads
2245 // (in nanoseconds). Each element of the array is the CPU time for the
2246 // thread ID specified in the corresponding entry in the given array
2247 // of thread IDs; or -1 if the thread does not exist or has terminated.
2248 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2249 // for the given thread is returned; otherwise, only user level CPU time
2250 // is returned.
2251 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2252 jlongArray timeArray,
2253 jboolean user_sys_cpu_time))
2254 // Check if threads is null
2255 if (ids == nullptr || timeArray == nullptr) {
2256 THROW(vmSymbols::java_lang_NullPointerException());
2257 }
2258
2259 ResourceMark rm(THREAD);
2260 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2261 typeArrayHandle ids_ah(THREAD, ta);
2262
2263 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2264 typeArrayHandle timeArray_h(THREAD, tia);
2265
2266 // validate the thread id array
2267 validate_thread_id_array(ids_ah, CHECK);
2268
2269 // timeArray must be of the same length as the given array of thread IDs
2270 int num_threads = ids_ah->length();
2271 if (num_threads != timeArray_h->length()) {
2272 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2273 "The length of the given long array does not match the length of "
2274 "the given array of thread IDs");
2275 }
2276
2277 ThreadsListHandle tlh;
2278 for (int i = 0; i < num_threads; i++) {
2279 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2280 if (is_platform_thread(java_thread)) {
2281 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2282 user_sys_cpu_time != 0));
2283 }
2284 }
2285 JVM_END
2286
2287 const struct jmmInterface_1_ jmm_interface = {
2288 nullptr,
2289 nullptr,
2290 jmm_GetVersion,
2291 jmm_GetOptionalSupport,
2292 jmm_GetThreadInfo,
2293 jmm_GetMemoryPools,
2294 jmm_GetMemoryManagers,
2295 jmm_GetMemoryPoolUsage,
2296 jmm_GetPeakMemoryPoolUsage,
2297 jmm_GetTotalThreadAllocatedMemory,
2298 jmm_GetOneThreadAllocatedMemory,
2299 jmm_GetThreadAllocatedMemory,
2300 jmm_GetMemoryUsage,
2301 jmm_GetLongAttribute,
2302 jmm_GetBoolAttribute,
2303 jmm_SetBoolAttribute,
2304 jmm_GetLongAttributes,
2305 jmm_FindMonitorDeadlockedThreads,
2306 jmm_GetThreadCpuTime,
2307 jmm_GetVMGlobalNames,
2308 jmm_GetVMGlobals,
2309 jmm_GetInternalThreadTimes,
2310 jmm_ResetStatistic,
2311 jmm_SetPoolSensor,
2312 jmm_SetPoolThreshold,
2313 jmm_GetPoolCollectionUsage,
2314 jmm_GetGCExtAttributeInfo,
2315 jmm_GetLastGCStat,
2316 jmm_GetThreadCpuTimeWithKind,
2317 jmm_GetThreadCpuTimesWithKind,
2318 jmm_DumpHeap0,
2319 jmm_FindDeadlockedThreads,
2320 jmm_SetVMGlobal,
2321 nullptr,
2322 jmm_DumpThreads,
2323 jmm_SetGCNotificationEnabled,
2324 jmm_GetDiagnosticCommands,
2325 jmm_GetDiagnosticCommandInfo,
2326 jmm_GetDiagnosticCommandArgumentsInfo,
2327 jmm_ExecuteDiagnosticCommand,
2328 jmm_SetDiagnosticFrameworkNotificationEnabled
2329 };
2330 #endif // INCLUDE_MANAGEMENT
2331
2332 void* Management::get_jmm_interface(int version) {
2333 #if INCLUDE_MANAGEMENT
2334 if (version == JMM_VERSION) {
2335 return (void*) &jmm_interface;
2336 }
2337 #endif // INCLUDE_MANAGEMENT
2338 return nullptr;
2339 }