1 /*
2 * Copyright (c) 2003, 2020, 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 "jmm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/iterator.hpp"
32 #include "memory/oopFactory.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "memory/universe.hpp"
35 #include "oops/klass.hpp"
36 #include "oops/objArrayKlass.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "oops/typeArrayOop.inline.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/flags/jvmFlag.hpp"
42 #include "runtime/globals.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/interfaceSupport.inline.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/jniHandles.inline.hpp"
47 #include "runtime/notificationThread.hpp"
48 #include "runtime/os.hpp"
49 #include "runtime/thread.inline.hpp"
50 #include "runtime/threadSMR.hpp"
51 #include "services/classLoadingService.hpp"
52 #include "services/diagnosticCommand.hpp"
53 #include "services/diagnosticFramework.hpp"
54 #include "services/writeableFlags.hpp"
55 #include "services/heapDumper.hpp"
56 #include "services/lowMemoryDetector.hpp"
57 #include "services/gcNotifier.hpp"
58 #include "services/nmtDCmd.hpp"
59 #include "services/management.hpp"
60 #include "services/memoryManager.hpp"
61 #include "services/memoryPool.hpp"
62 #include "services/memoryService.hpp"
63 #include "services/runtimeService.hpp"
64 #include "services/threadService.hpp"
65 #include "utilities/debug.hpp"
66 #include "utilities/formatBuffer.hpp"
67 #include "utilities/macros.hpp"
68
69 PerfVariable* Management::_begin_vm_creation_time = NULL;
70 PerfVariable* Management::_end_vm_creation_time = NULL;
71 PerfVariable* Management::_vm_init_done_time = NULL;
72
73 InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
74 InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
75 InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
76 InstanceKlass* Management::_gcInfo_klass = NULL;
77 InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
78 InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
79 InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
80 InstanceKlass* Management::_memoryUsage_klass = NULL;
81 InstanceKlass* Management::_sensor_klass = NULL;
82 InstanceKlass* Management::_threadInfo_klass = NULL;
83
84 jmmOptionalSupport Management::_optional_support = {0};
85 TimeStamp Management::_stamp;
86
87 void management_init() {
88 #if INCLUDE_MANAGEMENT
89 Management::init();
90 ThreadService::init();
91 RuntimeService::init();
92 ClassLoadingService::init();
93 #else
94 ThreadService::init();
95 #endif // INCLUDE_MANAGEMENT
96 }
97
98 #if INCLUDE_MANAGEMENT
99
100 void Management::init() {
101 EXCEPTION_MARK;
102
103 // These counters are for java.lang.management API support.
104 // They are created even if -XX:-UsePerfData is set and in
105 // that case, they will be allocated on C heap.
106
107 _begin_vm_creation_time =
108 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
109 PerfData::U_None, CHECK);
110
111 _end_vm_creation_time =
112 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
113 PerfData::U_None, CHECK);
114
115 _vm_init_done_time =
116 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
117 PerfData::U_None, CHECK);
118
119 // Initialize optional support
120 _optional_support.isLowMemoryDetectionSupported = 1;
121 _optional_support.isCompilationTimeMonitoringSupported = 1;
122 _optional_support.isThreadContentionMonitoringSupported = 1;
123
124 if (os::is_thread_cpu_time_supported()) {
125 _optional_support.isCurrentThreadCpuTimeSupported = 1;
126 _optional_support.isOtherThreadCpuTimeSupported = 1;
127 } else {
128 _optional_support.isCurrentThreadCpuTimeSupported = 0;
129 _optional_support.isOtherThreadCpuTimeSupported = 0;
130 }
131
132 _optional_support.isObjectMonitorUsageSupported = 1;
133 #if INCLUDE_SERVICES
134 // This depends on the heap inspector
135 _optional_support.isSynchronizerUsageSupported = 1;
136 #endif // INCLUDE_SERVICES
137 _optional_support.isThreadAllocatedMemorySupported = 1;
138 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
139
140 // Registration of the diagnostic commands
141 DCmdRegistrant::register_dcmds();
142 DCmdRegistrant::register_dcmds_ext();
143 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
144 | DCmd_Source_MBean;
145 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
146 }
147
148 void Management::initialize(TRAPS) {
149 if (UseNotificationThread) {
150 NotificationThread::initialize();
151 }
152 if (ManagementServer) {
153 ResourceMark rm(THREAD);
154 HandleMark hm(THREAD);
155
156 // Load and initialize the jdk.internal.agent.Agent class
157 // invoke startAgent method to start the management server
158 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
159 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
160 loader,
161 Handle(),
162 THREAD);
163 if (k == NULL) {
164 vm_exit_during_initialization("Management agent initialization failure: "
165 "class jdk.internal.agent.Agent not found.");
166 }
167
168 JavaValue result(T_VOID);
169 JavaCalls::call_static(&result,
170 k,
171 vmSymbols::startAgent_name(),
172 vmSymbols::void_method_signature(),
173 CHECK);
174 }
175 }
176
177 void Management::get_optional_support(jmmOptionalSupport* support) {
178 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
179 }
180
181 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
182 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
183 return initialize_klass(k, THREAD);
184 }
185
186 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
187 Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
188 if (k == NULL) {
189 return NULL;
190 }
191 return initialize_klass(k, THREAD);
192 }
193
194 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
195 InstanceKlass* ik = InstanceKlass::cast(k);
196 if (ik->should_be_initialized()) {
197 ik->initialize(CHECK_NULL);
198 }
199 // If these classes change to not be owned by the boot loader, they need
200 // to be walked to keep their class loader alive in oops_do.
201 assert(ik->class_loader() == NULL, "need to follow in oops_do");
202 return ik;
203 }
204
205 void Management::record_vm_startup_time(jlong begin, jlong duration) {
206 // if the performance counter is not initialized,
207 // then vm initialization failed; simply return.
208 if (_begin_vm_creation_time == NULL) return;
209
210 _begin_vm_creation_time->set_value(begin);
211 _end_vm_creation_time->set_value(begin + duration);
212 PerfMemory::set_accessible(true);
213 }
214
215 jlong Management::timestamp() {
216 TimeStamp t;
217 t.update();
218 return t.ticks() - _stamp.ticks();
219 }
220
221 void Management::oops_do(OopClosure* f) {
222 MemoryService::oops_do(f);
223 ThreadService::oops_do(f);
224 }
225
226 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
227 if (_threadInfo_klass == NULL) {
228 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
229 }
230 return _threadInfo_klass;
231 }
232
233 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
234 if (_memoryUsage_klass == NULL) {
235 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
236 }
237 return _memoryUsage_klass;
238 }
239
240 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
241 if (_memoryPoolMXBean_klass == NULL) {
242 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
243 }
244 return _memoryPoolMXBean_klass;
245 }
246
247 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
248 if (_memoryManagerMXBean_klass == NULL) {
249 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
250 }
251 return _memoryManagerMXBean_klass;
252 }
253
254 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
255 if (_garbageCollectorMXBean_klass == NULL) {
256 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
257 }
258 return _garbageCollectorMXBean_klass;
259 }
260
261 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
262 if (_sensor_klass == NULL) {
263 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
264 }
265 return _sensor_klass;
266 }
267
268 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
269 if (_managementFactoryHelper_klass == NULL) {
270 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
271 }
272 return _managementFactoryHelper_klass;
273 }
274
275 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
276 if (_garbageCollectorExtImpl_klass == NULL) {
277 _garbageCollectorExtImpl_klass =
278 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
279 }
280 return _garbageCollectorExtImpl_klass;
281 }
282
283 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
284 if (_gcInfo_klass == NULL) {
285 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
286 }
287 return _gcInfo_klass;
288 }
289
290 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
291 if (_diagnosticCommandImpl_klass == NULL) {
292 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
293 }
294 return _diagnosticCommandImpl_klass;
295 }
296
297 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
298 Handle snapshot_thread(THREAD, snapshot->threadObj());
299
300 jlong contended_time;
301 jlong waited_time;
302 if (ThreadService::is_thread_monitoring_contention()) {
303 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
304 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
305 } else {
306 // set them to -1 if thread contention monitoring is disabled.
307 contended_time = max_julong;
308 waited_time = max_julong;
309 }
310
311 int thread_status = snapshot->thread_status();
312 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
313 if (snapshot->is_ext_suspended()) {
314 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
315 }
316 if (snapshot->is_in_native()) {
317 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
318 }
319
320 ThreadStackTrace* st = snapshot->get_stack_trace();
321 Handle stacktrace_h;
322 if (st != NULL) {
323 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
324 } else {
325 stacktrace_h = Handle();
326 }
327
328 args->push_oop(snapshot_thread);
329 args->push_int(thread_status);
330 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
331 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
332 args->push_long(snapshot->contended_enter_count());
333 args->push_long(contended_time);
334 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
335 args->push_long(waited_time);
336 args->push_oop(stacktrace_h);
337 }
338
339 // Helper function to construct a ThreadInfo object
340 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
341 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
342 JavaCallArguments args(14);
343
344 // initialize the arguments for the ThreadInfo constructor
345 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
346
347 // Call ThreadInfo constructor with no locked monitors and synchronizers
348 Handle element = JavaCalls::construct_new_instance(
349 ik,
350 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
351 &args,
352 CHECK_NULL);
353 return (instanceOop) element();
354 }
355
356 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
357 objArrayHandle monitors_array,
358 typeArrayHandle depths_array,
359 objArrayHandle synchronizers_array,
360 TRAPS) {
361 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
362 JavaCallArguments args(17);
363
364 // initialize the arguments for the ThreadInfo constructor
365 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
366
367 // push the locked monitors and synchronizers in the arguments
368 args.push_oop(monitors_array);
369 args.push_oop(depths_array);
370 args.push_oop(synchronizers_array);
371
372 // Call ThreadInfo constructor with locked monitors and synchronizers
373 Handle element = JavaCalls::construct_new_instance(
374 ik,
375 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
376 &args,
377 CHECK_NULL);
378 return (instanceOop) element();
379 }
380
381
382 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
383 if (mgr == NULL) {
384 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
385 }
386 oop mgr_obj = JNIHandles::resolve(mgr);
387 instanceHandle h(THREAD, (instanceOop) mgr_obj);
388
389 InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
390 if (!h->is_a(k)) {
391 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
392 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
393 NULL);
394 }
395
396 MemoryManager* gc = MemoryService::get_memory_manager(h);
397 if (gc == NULL || !gc->is_gc_memory_manager()) {
398 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
399 "Invalid GC memory manager",
400 NULL);
401 }
402 return (GCMemoryManager*) gc;
403 }
404
405 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
406 if (obj == NULL) {
407 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
408 }
409
410 oop pool_obj = JNIHandles::resolve(obj);
411 assert(pool_obj->is_instance(), "Should be an instanceOop");
412 instanceHandle ph(THREAD, (instanceOop) pool_obj);
413
414 return MemoryService::get_memory_pool(ph);
415 }
416
417 #endif // INCLUDE_MANAGEMENT
418
419 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
420 int num_threads = ids_ah->length();
421
422 // Validate input thread IDs
423 int i = 0;
424 for (i = 0; i < num_threads; i++) {
425 jlong tid = ids_ah->long_at(i);
426 if (tid <= 0) {
427 // throw exception if invalid thread id.
428 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
429 "Invalid thread ID entry");
430 }
431 }
432 }
433
434 #if INCLUDE_MANAGEMENT
435
436 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
437 // check if the element of infoArray is of type ThreadInfo class
438 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
439 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
440 if (element_klass != threadinfo_klass) {
441 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
442 "infoArray element type is not ThreadInfo class");
443 }
444 }
445
446
447 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
448 if (obj == NULL) {
449 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
450 }
451
452 oop mgr_obj = JNIHandles::resolve(obj);
453 assert(mgr_obj->is_instance(), "Should be an instanceOop");
454 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
455
456 return MemoryService::get_memory_manager(mh);
457 }
458
459 // Returns a version string and sets major and minor version if
460 // the input parameters are non-null.
461 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
462 return JMM_VERSION;
463 JVM_END
464
465 // Gets the list of VM monitoring and management optional supports
466 // Returns 0 if succeeded; otherwise returns non-zero.
467 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
468 if (support == NULL) {
469 return -1;
470 }
471 Management::get_optional_support(support);
472 return 0;
473 JVM_END
474
475 // Returns an array of java/lang/management/MemoryPoolMXBean object
476 // one for each memory pool if obj == null; otherwise returns
477 // an array of memory pools for a given memory manager if
478 // it is a valid memory manager.
479 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
480 ResourceMark rm(THREAD);
481
482 int num_memory_pools;
483 MemoryManager* mgr = NULL;
484 if (obj == NULL) {
485 num_memory_pools = MemoryService::num_memory_pools();
486 } else {
487 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
488 if (mgr == NULL) {
489 return NULL;
490 }
491 num_memory_pools = mgr->num_memory_pools();
492 }
493
494 // Allocate the resulting MemoryPoolMXBean[] object
495 InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
496 objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
497 objArrayHandle poolArray(THREAD, r);
498
499 if (mgr == NULL) {
500 // Get all memory pools
501 for (int i = 0; i < num_memory_pools; i++) {
502 MemoryPool* pool = MemoryService::get_memory_pool(i);
503 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
504 instanceHandle ph(THREAD, p);
505 poolArray->obj_at_put(i, ph());
506 }
507 } else {
508 // Get memory pools managed by a given memory manager
509 for (int i = 0; i < num_memory_pools; i++) {
510 MemoryPool* pool = mgr->get_memory_pool(i);
511 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
512 instanceHandle ph(THREAD, p);
513 poolArray->obj_at_put(i, ph());
514 }
515 }
516 return (jobjectArray) JNIHandles::make_local(env, poolArray());
517 JVM_END
518
519 // Returns an array of java/lang/management/MemoryManagerMXBean object
520 // one for each memory manager if obj == null; otherwise returns
521 // an array of memory managers for a given memory pool if
522 // it is a valid memory pool.
523 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
524 ResourceMark rm(THREAD);
525
526 int num_mgrs;
527 MemoryPool* pool = NULL;
528 if (obj == NULL) {
529 num_mgrs = MemoryService::num_memory_managers();
530 } else {
531 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
532 if (pool == NULL) {
533 return NULL;
534 }
535 num_mgrs = pool->num_memory_managers();
536 }
537
538 // Allocate the resulting MemoryManagerMXBean[] object
539 InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
540 objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
541 objArrayHandle mgrArray(THREAD, r);
542
543 if (pool == NULL) {
544 // Get all memory managers
545 for (int i = 0; i < num_mgrs; i++) {
546 MemoryManager* mgr = MemoryService::get_memory_manager(i);
547 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
548 instanceHandle ph(THREAD, p);
549 mgrArray->obj_at_put(i, ph());
550 }
551 } else {
552 // Get memory managers for a given memory pool
553 for (int i = 0; i < num_mgrs; i++) {
554 MemoryManager* mgr = pool->get_memory_manager(i);
555 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
556 instanceHandle ph(THREAD, p);
557 mgrArray->obj_at_put(i, ph());
558 }
559 }
560 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
561 JVM_END
562
563
564 // Returns a java/lang/management/MemoryUsage object containing the memory usage
565 // of a given memory pool.
566 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
567 ResourceMark rm(THREAD);
568
569 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
570 if (pool != NULL) {
571 MemoryUsage usage = pool->get_memory_usage();
572 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
573 return JNIHandles::make_local(env, h());
574 } else {
575 return NULL;
576 }
577 JVM_END
578
579 // Returns a java/lang/management/MemoryUsage object containing the memory usage
580 // of a given memory pool.
581 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
582 ResourceMark rm(THREAD);
583
584 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
585 if (pool != NULL) {
586 MemoryUsage usage = pool->get_peak_memory_usage();
587 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
588 return JNIHandles::make_local(env, h());
589 } else {
590 return NULL;
591 }
592 JVM_END
593
594 // Returns a java/lang/management/MemoryUsage object containing the memory usage
595 // of a given memory pool after most recent GC.
596 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
597 ResourceMark rm(THREAD);
598
599 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
600 if (pool != NULL && pool->is_collected_pool()) {
601 MemoryUsage usage = pool->get_last_collection_usage();
602 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
603 return JNIHandles::make_local(env, h());
604 } else {
605 return NULL;
606 }
607 JVM_END
608
609 // Sets the memory pool sensor for a threshold type
610 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
611 if (obj == NULL || sensorObj == NULL) {
612 THROW(vmSymbols::java_lang_NullPointerException());
613 }
614
615 InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
616 oop s = JNIHandles::resolve(sensorObj);
617 assert(s->is_instance(), "Sensor should be an instanceOop");
618 instanceHandle sensor_h(THREAD, (instanceOop) s);
619 if (!sensor_h->is_a(sensor_klass)) {
620 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
621 "Sensor is not an instance of sun.management.Sensor class");
622 }
623
624 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
625 assert(mpool != NULL, "MemoryPool should exist");
626
627 switch (type) {
628 case JMM_USAGE_THRESHOLD_HIGH:
629 case JMM_USAGE_THRESHOLD_LOW:
630 // have only one sensor for threshold high and low
631 mpool->set_usage_sensor_obj(sensor_h);
632 break;
633 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
634 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
635 // have only one sensor for threshold high and low
636 mpool->set_gc_usage_sensor_obj(sensor_h);
637 break;
638 default:
639 assert(false, "Unrecognized type");
640 }
641
642 JVM_END
643
644
645 // Sets the threshold of a given memory pool.
646 // Returns the previous threshold.
647 //
648 // Input parameters:
649 // pool - the MemoryPoolMXBean object
650 // type - threshold type
651 // threshold - the new threshold (must not be negative)
652 //
653 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
654 if (threshold < 0) {
655 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
656 "Invalid threshold value",
657 -1);
658 }
659
660 if ((size_t)threshold > max_uintx) {
661 stringStream st;
662 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
663 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
664 }
665
666 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
667 assert(pool != NULL, "MemoryPool should exist");
668
669 jlong prev = 0;
670 switch (type) {
671 case JMM_USAGE_THRESHOLD_HIGH:
672 if (!pool->usage_threshold()->is_high_threshold_supported()) {
673 return -1;
674 }
675 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
676 break;
677
678 case JMM_USAGE_THRESHOLD_LOW:
679 if (!pool->usage_threshold()->is_low_threshold_supported()) {
680 return -1;
681 }
682 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
683 break;
684
685 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
686 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
687 return -1;
688 }
689 // return and the new threshold is effective for the next GC
690 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
691
692 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
693 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
694 return -1;
695 }
696 // return and the new threshold is effective for the next GC
697 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
698
699 default:
700 assert(false, "Unrecognized type");
701 return -1;
702 }
703
704 // When the threshold is changed, reevaluate if the low memory
705 // detection is enabled.
706 if (prev != threshold) {
707 LowMemoryDetector::recompute_enabled_for_collected_pools();
708 LowMemoryDetector::detect_low_memory(pool);
709 }
710 return prev;
711 JVM_END
712
713 // Returns a java/lang/management/MemoryUsage object representing
714 // the memory usage for the heap or non-heap memory.
715 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
716 ResourceMark rm(THREAD);
717
718 MemoryUsage usage;
719
720 if (heap) {
721 usage = Universe::heap()->memory_usage();
722 } else {
723 // Calculate the memory usage by summing up the pools.
724 size_t total_init = 0;
725 size_t total_used = 0;
726 size_t total_committed = 0;
727 size_t total_max = 0;
728 bool has_undefined_init_size = false;
729 bool has_undefined_max_size = false;
730
731 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
732 MemoryPool* pool = MemoryService::get_memory_pool(i);
733 if (pool->is_non_heap()) {
734 MemoryUsage u = pool->get_memory_usage();
735 total_used += u.used();
736 total_committed += u.committed();
737
738 if (u.init_size() == MemoryUsage::undefined_size()) {
739 has_undefined_init_size = true;
740 }
741 if (!has_undefined_init_size) {
742 total_init += u.init_size();
743 }
744
745 if (u.max_size() == MemoryUsage::undefined_size()) {
746 has_undefined_max_size = true;
747 }
748 if (!has_undefined_max_size) {
749 total_max += u.max_size();
750 }
751 }
752 }
753
754 // if any one of the memory pool has undefined init_size or max_size,
755 // set it to MemoryUsage::undefined_size()
756 if (has_undefined_init_size) {
757 total_init = MemoryUsage::undefined_size();
758 }
759 if (has_undefined_max_size) {
760 total_max = MemoryUsage::undefined_size();
761 }
762
763 usage = MemoryUsage(total_init, total_used, total_committed, total_max);
764 }
765
766 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
767 return JNIHandles::make_local(env, obj());
768 JVM_END
769
770 // Returns the boolean value of a given attribute.
771 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
772 switch (att) {
773 case JMM_VERBOSE_GC:
774 return MemoryService::get_verbose();
775 case JMM_VERBOSE_CLASS:
776 return ClassLoadingService::get_verbose();
777 case JMM_THREAD_CONTENTION_MONITORING:
778 return ThreadService::is_thread_monitoring_contention();
779 case JMM_THREAD_CPU_TIME:
780 return ThreadService::is_thread_cpu_time_enabled();
781 case JMM_THREAD_ALLOCATED_MEMORY:
782 return ThreadService::is_thread_allocated_memory_enabled();
783 default:
784 assert(0, "Unrecognized attribute");
785 return false;
786 }
787 JVM_END
788
789 // Sets the given boolean attribute and returns the previous value.
790 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
791 switch (att) {
792 case JMM_VERBOSE_GC:
793 return MemoryService::set_verbose(flag != 0);
794 case JMM_VERBOSE_CLASS:
795 return ClassLoadingService::set_verbose(flag != 0);
796 case JMM_THREAD_CONTENTION_MONITORING:
797 return ThreadService::set_thread_monitoring_contention(flag != 0);
798 case JMM_THREAD_CPU_TIME:
799 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
800 case JMM_THREAD_ALLOCATED_MEMORY:
801 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
802 default:
803 assert(0, "Unrecognized attribute");
804 return false;
805 }
806 JVM_END
807
808
809 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
810 switch (att) {
811 case JMM_GC_TIME_MS:
812 return mgr->gc_time_ms();
813
814 case JMM_GC_COUNT:
815 return mgr->gc_count();
816
817 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
818 // current implementation only has 1 ext attribute
819 return 1;
820
821 default:
822 assert(0, "Unrecognized GC attribute");
823 return -1;
824 }
825 }
826
827 class VmThreadCountClosure: public ThreadClosure {
828 private:
829 int _count;
830 public:
831 VmThreadCountClosure() : _count(0) {};
832 void do_thread(Thread* thread);
833 int count() { return _count; }
834 };
835
836 void VmThreadCountClosure::do_thread(Thread* thread) {
837 // exclude externally visible JavaThreads
838 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
839 return;
840 }
841
842 _count++;
843 }
844
845 static jint get_vm_thread_count() {
846 VmThreadCountClosure vmtcc;
847 {
848 MutexLocker ml(Threads_lock);
849 Threads::threads_do(&vmtcc);
850 }
851
852 return vmtcc.count();
853 }
854
855 static jint get_num_flags() {
856 // last flag entry is always NULL, so subtract 1
857 int count = 0;
858 JVMFlag* flag;
859 JVMFLAG_FOR_EACH(flag) {
860 // Exclude the locked (diagnostic, experimental) flags
861 if (flag->is_unlocked() || flag->is_unlocker()) {
862 count++;
863 }
864 }
865 return count;
866 }
867
868 static jlong get_long_attribute(jmmLongAttribute att) {
869 switch (att) {
870 case JMM_CLASS_LOADED_COUNT:
871 return ClassLoadingService::loaded_class_count();
872
873 case JMM_CLASS_UNLOADED_COUNT:
874 return ClassLoadingService::unloaded_class_count();
875
876 case JMM_THREAD_TOTAL_COUNT:
877 return ThreadService::get_total_thread_count();
878
879 case JMM_THREAD_LIVE_COUNT:
880 return ThreadService::get_live_thread_count();
881
882 case JMM_THREAD_PEAK_COUNT:
883 return ThreadService::get_peak_thread_count();
884
885 case JMM_THREAD_DAEMON_COUNT:
886 return ThreadService::get_daemon_thread_count();
887
888 case JMM_JVM_INIT_DONE_TIME_MS:
889 return Management::vm_init_done_time();
890
891 case JMM_JVM_UPTIME_MS:
892 return Management::ticks_to_ms(os::elapsed_counter());
893
894 case JMM_COMPILE_TOTAL_TIME_MS:
895 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
896
897 case JMM_OS_PROCESS_ID:
898 return os::current_process_id();
899
900 // Hotspot-specific counters
901 case JMM_CLASS_LOADED_BYTES:
902 return ClassLoadingService::loaded_class_bytes();
903
904 case JMM_CLASS_UNLOADED_BYTES:
905 return ClassLoadingService::unloaded_class_bytes();
906
907 case JMM_SHARED_CLASS_LOADED_COUNT:
908 return ClassLoadingService::loaded_shared_class_count();
909
910 case JMM_SHARED_CLASS_UNLOADED_COUNT:
911 return ClassLoadingService::unloaded_shared_class_count();
912
913
914 case JMM_SHARED_CLASS_LOADED_BYTES:
915 return ClassLoadingService::loaded_shared_class_bytes();
916
917 case JMM_SHARED_CLASS_UNLOADED_BYTES:
918 return ClassLoadingService::unloaded_shared_class_bytes();
919
920 case JMM_TOTAL_CLASSLOAD_TIME_MS:
921 return ClassLoader::classloader_time_ms();
922
923 case JMM_VM_GLOBAL_COUNT:
924 return get_num_flags();
925
926 case JMM_SAFEPOINT_COUNT:
927 return RuntimeService::safepoint_count();
928
929 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
930 return RuntimeService::safepoint_sync_time_ms();
931
932 case JMM_TOTAL_STOPPED_TIME_MS:
933 return RuntimeService::safepoint_time_ms();
934
935 case JMM_TOTAL_APP_TIME_MS:
936 return RuntimeService::application_time_ms();
937
938 case JMM_VM_THREAD_COUNT:
939 return get_vm_thread_count();
940
941 case JMM_CLASS_INIT_TOTAL_COUNT:
942 return ClassLoader::class_init_count();
943
944 case JMM_CLASS_INIT_TOTAL_TIME_MS:
945 return ClassLoader::class_init_time_ms();
946
947 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
948 return ClassLoader::class_verify_time_ms();
949
950 case JMM_METHOD_DATA_SIZE_BYTES:
951 return ClassLoadingService::class_method_data_size();
952
953 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
954 return os::physical_memory();
955
956 default:
957 return -1;
958 }
959 }
960
961
962 // Returns the long value of a given attribute.
963 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
964 if (obj == NULL) {
965 return get_long_attribute(att);
966 } else {
967 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
968 if (mgr != NULL) {
969 return get_gc_attribute(mgr, att);
970 }
971 }
972 return -1;
973 JVM_END
974
975 // Gets the value of all attributes specified in the given array
976 // and sets the value in the result array.
977 // Returns the number of attributes found.
978 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
979 jobject obj,
980 jmmLongAttribute* atts,
981 jint count,
982 jlong* result))
983
984 int num_atts = 0;
985 if (obj == NULL) {
986 for (int i = 0; i < count; i++) {
987 result[i] = get_long_attribute(atts[i]);
988 if (result[i] != -1) {
989 num_atts++;
990 }
991 }
992 } else {
993 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
994 for (int i = 0; i < count; i++) {
995 result[i] = get_gc_attribute(mgr, atts[i]);
996 if (result[i] != -1) {
997 num_atts++;
998 }
999 }
1000 }
1001 return num_atts;
1002 JVM_END
1003
1004 // Helper function to do thread dump for a specific list of threads
1005 static void do_thread_dump(ThreadDumpResult* dump_result,
1006 typeArrayHandle ids_ah, // array of thread ID (long[])
1007 int num_threads,
1008 int max_depth,
1009 bool with_locked_monitors,
1010 bool with_locked_synchronizers,
1011 TRAPS) {
1012 // no need to actually perform thread dump if no TIDs are specified
1013 if (num_threads == 0) return;
1014
1015 // First get an array of threadObj handles.
1016 // A JavaThread may terminate before we get the stack trace.
1017 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1018
1019 {
1020 // Need this ThreadsListHandle for converting Java thread IDs into
1021 // threadObj handles; dump_result->set_t_list() is called in the
1022 // VM op below so we can't use it yet.
1023 ThreadsListHandle tlh;
1024 for (int i = 0; i < num_threads; i++) {
1025 jlong tid = ids_ah->long_at(i);
1026 JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1027 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1028 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1029 thread_handle_array->append(threadObj_h);
1030 }
1031 }
1032
1033 // Obtain thread dumps and thread snapshot information
1034 VM_ThreadDump op(dump_result,
1035 thread_handle_array,
1036 num_threads,
1037 max_depth, /* stack depth */
1038 with_locked_monitors,
1039 with_locked_synchronizers);
1040 VMThread::execute(&op);
1041 }
1042
1043 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1044 // for the thread ID specified in the corresponding entry in
1045 // the given array of thread IDs; or NULL if the thread does not exist
1046 // or has terminated.
1047 //
1048 // Input parameters:
1049 // ids - array of thread IDs
1050 // maxDepth - the maximum depth of stack traces to be dumped:
1051 // maxDepth == -1 requests to dump entire stack trace.
1052 // maxDepth == 0 requests no stack trace.
1053 // infoArray - array of ThreadInfo objects
1054 //
1055 // QQQ - Why does this method return a value instead of void?
1056 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1057 // Check if threads is null
1058 if (ids == NULL || infoArray == NULL) {
1059 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1060 }
1061
1062 if (maxDepth < -1) {
1063 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1064 "Invalid maxDepth", -1);
1065 }
1066
1067 ResourceMark rm(THREAD);
1068 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1069 typeArrayHandle ids_ah(THREAD, ta);
1070
1071 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1072 objArrayOop oa = objArrayOop(infoArray_obj);
1073 objArrayHandle infoArray_h(THREAD, oa);
1074
1075 // validate the thread id array
1076 validate_thread_id_array(ids_ah, CHECK_0);
1077
1078 // validate the ThreadInfo[] parameters
1079 validate_thread_info_array(infoArray_h, CHECK_0);
1080
1081 // infoArray must be of the same length as the given array of thread IDs
1082 int num_threads = ids_ah->length();
1083 if (num_threads != infoArray_h->length()) {
1084 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1085 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1086 }
1087
1088 // Must use ThreadDumpResult to store the ThreadSnapshot.
1089 // GC may occur after the thread snapshots are taken but before
1090 // this function returns. The threadObj and other oops kept
1091 // in the ThreadSnapshot are marked and adjusted during GC.
1092 ThreadDumpResult dump_result(num_threads);
1093
1094 if (maxDepth == 0) {
1095 // No stack trace to dump so we do not need to stop the world.
1096 // Since we never do the VM op here we must set the threads list.
1097 dump_result.set_t_list();
1098 for (int i = 0; i < num_threads; i++) {
1099 jlong tid = ids_ah->long_at(i);
1100 JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1101 if (jt == NULL) {
1102 // if the thread does not exist or now it is terminated,
1103 // create dummy snapshot
1104 dump_result.add_thread_snapshot();
1105 } else {
1106 dump_result.add_thread_snapshot(jt);
1107 }
1108 }
1109 } else {
1110 // obtain thread dump with the specific list of threads with stack trace
1111 do_thread_dump(&dump_result,
1112 ids_ah,
1113 num_threads,
1114 maxDepth,
1115 false, /* no locked monitor */
1116 false, /* no locked synchronizers */
1117 CHECK_0);
1118 }
1119
1120 int num_snapshots = dump_result.num_snapshots();
1121 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1122 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1123 int index = 0;
1124 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1125 // For each thread, create an java/lang/management/ThreadInfo object
1126 // and fill with the thread information
1127
1128 if (ts->threadObj() == NULL) {
1129 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1130 infoArray_h->obj_at_put(index, NULL);
1131 continue;
1132 }
1133
1134 // Create java.lang.management.ThreadInfo object
1135 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1136 infoArray_h->obj_at_put(index, info_obj);
1137 }
1138 return 0;
1139 JVM_END
1140
1141 // Dump thread info for the specified threads.
1142 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1143 // for the thread ID specified in the corresponding entry in
1144 // the given array of thread IDs; or NULL if the thread does not exist
1145 // or has terminated.
1146 //
1147 // Input parameter:
1148 // ids - array of thread IDs; NULL indicates all live threads
1149 // locked_monitors - if true, dump locked object monitors
1150 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1151 //
1152 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1153 jboolean locked_synchronizers, jint maxDepth))
1154 ResourceMark rm(THREAD);
1155
1156 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1157 int num_threads = (ta != NULL ? ta->length() : 0);
1158 typeArrayHandle ids_ah(THREAD, ta);
1159
1160 ThreadDumpResult dump_result(num_threads); // can safepoint
1161
1162 if (ids_ah() != NULL) {
1163
1164 // validate the thread id array
1165 validate_thread_id_array(ids_ah, CHECK_NULL);
1166
1167 // obtain thread dump of a specific list of threads
1168 do_thread_dump(&dump_result,
1169 ids_ah,
1170 num_threads,
1171 maxDepth, /* stack depth */
1172 (locked_monitors ? true : false), /* with locked monitors */
1173 (locked_synchronizers ? true : false), /* with locked synchronizers */
1174 CHECK_NULL);
1175 } else {
1176 // obtain thread dump of all threads
1177 VM_ThreadDump op(&dump_result,
1178 maxDepth, /* stack depth */
1179 (locked_monitors ? true : false), /* with locked monitors */
1180 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1181 VMThread::execute(&op);
1182 }
1183
1184 int num_snapshots = dump_result.num_snapshots();
1185 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1186
1187 // create the result ThreadInfo[] object
1188 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1189 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1190 objArrayHandle result_h(THREAD, r);
1191
1192 int index = 0;
1193 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1194 if (ts->threadObj() == NULL) {
1195 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1196 result_h->obj_at_put(index, NULL);
1197 continue;
1198 }
1199
1200 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1201 assert(stacktrace != NULL, "Must have a stack trace dumped");
1202
1203 // Create Object[] filled with locked monitors
1204 // Create int[] filled with the stack depth where a monitor was locked
1205 int num_frames = stacktrace->get_stack_depth();
1206 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1207
1208 // Count the total number of locked monitors
1209 for (int i = 0; i < num_frames; i++) {
1210 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1211 num_locked_monitors += frame->num_locked_monitors();
1212 }
1213
1214 objArrayHandle monitors_array;
1215 typeArrayHandle depths_array;
1216 objArrayHandle synchronizers_array;
1217
1218 if (locked_monitors) {
1219 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1220 // where the thread locked it
1221 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1222 objArrayHandle mh(THREAD, array);
1223 monitors_array = mh;
1224
1225 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1226 typeArrayHandle dh(THREAD, tarray);
1227 depths_array = dh;
1228
1229 int count = 0;
1230 int j = 0;
1231 for (int depth = 0; depth < num_frames; depth++) {
1232 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1233 int len = frame->num_locked_monitors();
1234 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1235 for (j = 0; j < len; j++) {
1236 oop monitor = locked_monitors->at(j);
1237 assert(monitor != NULL, "must be a Java object");
1238 monitors_array->obj_at_put(count, monitor);
1239 depths_array->int_at_put(count, depth);
1240 count++;
1241 }
1242 }
1243
1244 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1245 for (j = 0; j < jni_locked_monitors->length(); j++) {
1246 oop object = jni_locked_monitors->at(j);
1247 assert(object != NULL, "must be a Java object");
1248 monitors_array->obj_at_put(count, object);
1249 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1250 depths_array->int_at_put(count, -1);
1251 count++;
1252 }
1253 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1254 }
1255
1256 if (locked_synchronizers) {
1257 // Create Object[] filled with locked JSR-166 synchronizers
1258 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1259 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1260 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1261 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1262
1263 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1264 objArrayHandle sh(THREAD, array);
1265 synchronizers_array = sh;
1266
1267 for (int k = 0; k < num_locked_synchronizers; k++) {
1268 synchronizers_array->obj_at_put(k, locks->at(k));
1269 }
1270 }
1271
1272 // Create java.lang.management.ThreadInfo object
1273 instanceOop info_obj = Management::create_thread_info_instance(ts,
1274 monitors_array,
1275 depths_array,
1276 synchronizers_array,
1277 CHECK_NULL);
1278 result_h->obj_at_put(index, info_obj);
1279 }
1280
1281 return (jobjectArray) JNIHandles::make_local(env, result_h());
1282 JVM_END
1283
1284 // Reset statistic. Return true if the requested statistic is reset.
1285 // Otherwise, return false.
1286 //
1287 // Input parameters:
1288 // obj - specify which instance the statistic associated with to be reset
1289 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1290 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1291 // type - the type of statistic to be reset
1292 //
1293 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1294 ResourceMark rm(THREAD);
1295
1296 switch (type) {
1297 case JMM_STAT_PEAK_THREAD_COUNT:
1298 ThreadService::reset_peak_thread_count();
1299 return true;
1300
1301 case JMM_STAT_THREAD_CONTENTION_COUNT:
1302 case JMM_STAT_THREAD_CONTENTION_TIME: {
1303 jlong tid = obj.j;
1304 if (tid < 0) {
1305 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1306 }
1307
1308 // Look for the JavaThread of this given tid
1309 JavaThreadIteratorWithHandle jtiwh;
1310 if (tid == 0) {
1311 // reset contention statistics for all threads if tid == 0
1312 for (; JavaThread *java_thread = jtiwh.next(); ) {
1313 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1314 ThreadService::reset_contention_count_stat(java_thread);
1315 } else {
1316 ThreadService::reset_contention_time_stat(java_thread);
1317 }
1318 }
1319 } else {
1320 // reset contention statistics for a given thread
1321 JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1322 if (java_thread == NULL) {
1323 return false;
1324 }
1325
1326 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1327 ThreadService::reset_contention_count_stat(java_thread);
1328 } else {
1329 ThreadService::reset_contention_time_stat(java_thread);
1330 }
1331 }
1332 return true;
1333 break;
1334 }
1335 case JMM_STAT_PEAK_POOL_USAGE: {
1336 jobject o = obj.l;
1337 if (o == NULL) {
1338 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1339 }
1340
1341 oop pool_obj = JNIHandles::resolve(o);
1342 assert(pool_obj->is_instance(), "Should be an instanceOop");
1343 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1344
1345 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1346 if (pool != NULL) {
1347 pool->reset_peak_memory_usage();
1348 return true;
1349 }
1350 break;
1351 }
1352 case JMM_STAT_GC_STAT: {
1353 jobject o = obj.l;
1354 if (o == NULL) {
1355 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1356 }
1357
1358 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_false);
1359 if (mgr != NULL) {
1360 mgr->reset_gc_stat();
1361 return true;
1362 }
1363 break;
1364 }
1365 default:
1366 assert(0, "Unknown Statistic Type");
1367 }
1368 return false;
1369 JVM_END
1370
1371 // Returns the fast estimate of CPU time consumed by
1372 // a given thread (in nanoseconds).
1373 // If thread_id == 0, return CPU time for the current thread.
1374 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1375 if (!os::is_thread_cpu_time_supported()) {
1376 return -1;
1377 }
1378
1379 if (thread_id < 0) {
1380 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1381 "Invalid thread ID", -1);
1382 }
1383
1384 JavaThread* java_thread = NULL;
1385 if (thread_id == 0) {
1386 // current thread
1387 return os::current_thread_cpu_time();
1388 } else {
1389 ThreadsListHandle tlh;
1390 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1391 if (java_thread != NULL) {
1392 return os::thread_cpu_time((Thread*) java_thread);
1393 }
1394 }
1395 return -1;
1396 JVM_END
1397
1398 // Returns a String array of all VM global flag names
1399 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1400 int nFlags = JVMFlag::num_flags();
1401 // allocate a temp array
1402 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1403 nFlags, CHECK_NULL);
1404 objArrayHandle flags_ah(THREAD, r);
1405 int num_entries = 0;
1406 JVMFlag* flag;
1407 JVMFLAG_FOR_EACH(flag) {
1408 // Exclude notproduct and develop flags in product builds.
1409 if (flag->is_constant_in_binary()) {
1410 continue;
1411 }
1412 // Exclude the locked (experimental, diagnostic) flags
1413 if (flag->is_unlocked() || flag->is_unlocker()) {
1414 Handle s = java_lang_String::create_from_str(flag->name(), CHECK_NULL);
1415 flags_ah->obj_at_put(num_entries, s());
1416 num_entries++;
1417 }
1418 }
1419
1420 if (num_entries < nFlags) {
1421 // Return array of right length
1422 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_NULL);
1423 for(int i = 0; i < num_entries; i++) {
1424 res->obj_at_put(i, flags_ah->obj_at(i));
1425 }
1426 return (jobjectArray)JNIHandles::make_local(env, res);
1427 }
1428
1429 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1430 JVM_END
1431
1432 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1433 // can't be determined, true otherwise. If false is returned, then *global
1434 // will be incomplete and invalid.
1435 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {
1436 Handle flag_name;
1437 if (name() == NULL) {
1438 flag_name = java_lang_String::create_from_str(flag->name(), CHECK_false);
1439 } else {
1440 flag_name = name;
1441 }
1442 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1443
1444 if (flag->is_bool()) {
1445 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1446 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1447 } else if (flag->is_int()) {
1448 global->value.j = (jlong)flag->get_int();
1449 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1450 } else if (flag->is_uint()) {
1451 global->value.j = (jlong)flag->get_uint();
1452 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1453 } else if (flag->is_intx()) {
1454 global->value.j = (jlong)flag->get_intx();
1455 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1456 } else if (flag->is_uintx()) {
1457 global->value.j = (jlong)flag->get_uintx();
1458 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1459 } else if (flag->is_uint64_t()) {
1460 global->value.j = (jlong)flag->get_uint64_t();
1461 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1462 } else if (flag->is_double()) {
1463 global->value.d = (jdouble)flag->get_double();
1464 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1465 } else if (flag->is_size_t()) {
1466 global->value.j = (jlong)flag->get_size_t();
1467 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1468 } else if (flag->is_ccstr()) {
1469 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1470 global->value.l = (jobject)JNIHandles::make_local(env, str());
1471 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1472 } else {
1473 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1474 return false;
1475 }
1476
1477 global->writeable = flag->is_writeable();
1478 global->external = flag->is_external();
1479 switch (flag->get_origin()) {
1480 case JVMFlag::DEFAULT:
1481 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1482 break;
1483 case JVMFlag::COMMAND_LINE:
1484 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1485 break;
1486 case JVMFlag::ENVIRON_VAR:
1487 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1488 break;
1489 case JVMFlag::CONFIG_FILE:
1490 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1491 break;
1492 case JVMFlag::MANAGEMENT:
1493 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1494 break;
1495 case JVMFlag::ERGONOMIC:
1496 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1497 break;
1498 case JVMFlag::ATTACH_ON_DEMAND:
1499 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1500 break;
1501 default:
1502 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1503 }
1504
1505 return true;
1506 }
1507
1508 // Fill globals array of count length with jmmVMGlobal entries
1509 // specified by names. If names == NULL, fill globals array
1510 // with all Flags. Return value is number of entries
1511 // created in globals.
1512 // If a JVMFlag with a given name in an array element does not
1513 // exist, globals[i].name will be set to NULL.
1514 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1515 jobjectArray names,
1516 jmmVMGlobal *globals,
1517 jint count))
1518
1519
1520 if (globals == NULL) {
1521 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1522 }
1523
1524 ResourceMark rm(THREAD);
1525
1526 if (names != NULL) {
1527 // return the requested globals
1528 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1529 objArrayHandle names_ah(THREAD, ta);
1530 // Make sure we have a String array
1531 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1532 if (element_klass != SystemDictionary::String_klass()) {
1533 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1534 "Array element type is not String class", 0);
1535 }
1536
1537 int names_length = names_ah->length();
1538 int num_entries = 0;
1539 for (int i = 0; i < names_length && i < count; i++) {
1540 oop s = names_ah->obj_at(i);
1541 if (s == NULL) {
1542 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1543 }
1544
1545 Handle sh(THREAD, s);
1546 char* str = java_lang_String::as_utf8_string(s);
1547 JVMFlag* flag = JVMFlag::find_flag(str);
1548 if (flag != NULL &&
1549 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1550 num_entries++;
1551 } else {
1552 globals[i].name = NULL;
1553 }
1554 }
1555 return num_entries;
1556 } else {
1557 // return all globals if names == NULL
1558
1559 // last flag entry is always NULL, so subtract 1
1560 Handle null_h;
1561 int num_entries = 0;
1562 JVMFlag* flag;
1563 JVMFLAG_FOR_EACH(flag) {
1564 if (num_entries >= count) {
1565 break;
1566 }
1567 // Exclude notproduct and develop flags in product builds.
1568 if (flag->is_constant_in_binary()) {
1569 continue;
1570 }
1571 // Exclude the locked (diagnostic, experimental) flags
1572 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1573 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1574 num_entries++;
1575 }
1576 }
1577 return num_entries;
1578 }
1579 JVM_END
1580
1581 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1582 ResourceMark rm(THREAD);
1583
1584 oop fn = JNIHandles::resolve_external_guard(flag_name);
1585 if (fn == NULL) {
1586 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1587 "The flag name cannot be null.");
1588 }
1589 char* name = java_lang_String::as_utf8_string(fn);
1590
1591 FormatBuffer<80> error_msg("%s", "");
1592 int succeed = WriteableFlags::set_flag(name, new_value, JVMFlag::MANAGEMENT, error_msg);
1593
1594 if (succeed != JVMFlag::SUCCESS) {
1595 if (succeed == JVMFlag::MISSING_VALUE) {
1596 // missing value causes NPE to be thrown
1597 THROW(vmSymbols::java_lang_NullPointerException());
1598 } else {
1599 // all the other errors are reported as IAE with the appropriate error message
1600 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1601 error_msg.buffer());
1602 }
1603 }
1604 assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1605 JVM_END
1606
1607 class ThreadTimesClosure: public ThreadClosure {
1608 private:
1609 objArrayHandle _names_strings;
1610 char **_names_chars;
1611 typeArrayHandle _times;
1612 int _names_len;
1613 int _times_len;
1614 int _count;
1615
1616 public:
1617 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1618 ~ThreadTimesClosure();
1619 virtual void do_thread(Thread* thread);
1620 void do_unlocked();
1621 int count() { return _count; }
1622 };
1623
1624 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1625 typeArrayHandle times) {
1626 assert(names() != NULL, "names was NULL");
1627 assert(times() != NULL, "times was NULL");
1628 _names_strings = names;
1629 _names_len = names->length();
1630 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1631 _times = times;
1632 _times_len = times->length();
1633 _count = 0;
1634 }
1635
1636 //
1637 // Called with Threads_lock held
1638 //
1639 void ThreadTimesClosure::do_thread(Thread* thread) {
1640 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
1641 assert(thread != NULL, "thread was NULL");
1642
1643 // exclude externally visible JavaThreads
1644 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1645 return;
1646 }
1647
1648 if (_count >= _names_len || _count >= _times_len) {
1649 // skip if the result array is not big enough
1650 return;
1651 }
1652
1653 EXCEPTION_MARK;
1654 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1655
1656 assert(thread->name() != NULL, "All threads should have a name");
1657 _names_chars[_count] = os::strdup(thread->name());
1658 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1659 os::thread_cpu_time(thread) : -1);
1660 _count++;
1661 }
1662
1663 // Called without Threads_lock, we can allocate String objects.
1664 void ThreadTimesClosure::do_unlocked() {
1665
1666 EXCEPTION_MARK;
1667 for (int i = 0; i < _count; i++) {
1668 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1669 _names_strings->obj_at_put(i, s());
1670 }
1671 }
1672
1673 ThreadTimesClosure::~ThreadTimesClosure() {
1674 for (int i = 0; i < _count; i++) {
1675 os::free(_names_chars[i]);
1676 }
1677 FREE_C_HEAP_ARRAY(char *, _names_chars);
1678 }
1679
1680 // Fills names with VM internal thread names and times with the corresponding
1681 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1682 // If the element type of names is not String, an IllegalArgumentException is
1683 // thrown.
1684 // If an array is not large enough to hold all the entries, only the entries
1685 // that fit will be returned. Return value is the number of VM internal
1686 // threads entries.
1687 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1688 jobjectArray names,
1689 jlongArray times))
1690 if (names == NULL || times == NULL) {
1691 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1692 }
1693 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1694 objArrayHandle names_ah(THREAD, na);
1695
1696 // Make sure we have a String array
1697 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1698 if (element_klass != SystemDictionary::String_klass()) {
1699 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1700 "Array element type is not String class", 0);
1701 }
1702
1703 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1704 typeArrayHandle times_ah(THREAD, ta);
1705
1706 ThreadTimesClosure ttc(names_ah, times_ah);
1707 {
1708 MutexLocker ml(THREAD, Threads_lock);
1709 Threads::threads_do(&ttc);
1710 }
1711 ttc.do_unlocked();
1712 return ttc.count();
1713 JVM_END
1714
1715 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1716 ResourceMark rm(THREAD);
1717
1718 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1719 VMThread::execute(&op);
1720
1721 DeadlockCycle* deadlocks = op.result();
1722 if (deadlocks == NULL) {
1723 // no deadlock found and return
1724 return Handle();
1725 }
1726
1727 int num_threads = 0;
1728 DeadlockCycle* cycle;
1729 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1730 num_threads += cycle->num_threads();
1731 }
1732
1733 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1734 objArrayHandle threads_ah(THREAD, r);
1735
1736 int index = 0;
1737 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1738 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1739 int len = deadlock_threads->length();
1740 for (int i = 0; i < len; i++) {
1741 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1742 index++;
1743 }
1744 }
1745 return threads_ah;
1746 }
1747
1748 // Finds cycles of threads that are deadlocked involved in object monitors
1749 // and JSR-166 synchronizers.
1750 // Returns an array of Thread objects which are in deadlock, if any.
1751 // Otherwise, returns NULL.
1752 //
1753 // Input parameter:
1754 // object_monitors_only - if true, only check object monitors
1755 //
1756 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1757 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_NULL);
1758 return (jobjectArray) JNIHandles::make_local(env, result());
1759 JVM_END
1760
1761 // Finds cycles of threads that are deadlocked on monitor locks
1762 // Returns an array of Thread objects which are in deadlock, if any.
1763 // Otherwise, returns NULL.
1764 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1765 Handle result = find_deadlocks(true, CHECK_NULL);
1766 return (jobjectArray) JNIHandles::make_local(env, result());
1767 JVM_END
1768
1769 // Gets the information about GC extension attributes including
1770 // the name of the attribute, its type, and a short description.
1771 //
1772 // Input parameters:
1773 // mgr - GC memory manager
1774 // info - caller allocated array of jmmExtAttributeInfo
1775 // count - number of elements of the info array
1776 //
1777 // Returns the number of GC extension attributes filled in the info array; or
1778 // -1 if info is not big enough
1779 //
1780 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1781 // All GC memory managers have 1 attribute (number of GC threads)
1782 if (count == 0) {
1783 return 0;
1784 }
1785
1786 if (info == NULL) {
1787 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1788 }
1789
1790 info[0].name = "GcThreadCount";
1791 info[0].type = 'I';
1792 info[0].description = "Number of GC threads";
1793 return 1;
1794 JVM_END
1795
1796 // verify the given array is an array of java/lang/management/MemoryUsage objects
1797 // of a given length and return the objArrayOop
1798 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1799 if (array == NULL) {
1800 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1801 }
1802
1803 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1804 objArrayHandle array_h(THREAD, oa);
1805
1806 // array must be of the given length
1807 if (length != array_h->length()) {
1808 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1809 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1810 }
1811
1812 // check if the element of array is of type MemoryUsage class
1813 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_NULL);
1814 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1815 if (element_klass != usage_klass) {
1816 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1817 "The element type is not MemoryUsage class", 0);
1818 }
1819
1820 return array_h();
1821 }
1822
1823 // Gets the statistics of the last GC of a given GC memory manager.
1824 // Input parameters:
1825 // obj - GarbageCollectorMXBean object
1826 // gc_stat - caller allocated jmmGCStat where:
1827 // a. before_gc_usage - array of MemoryUsage objects
1828 // b. after_gc_usage - array of MemoryUsage objects
1829 // c. gc_ext_attributes_values_size is set to the
1830 // gc_ext_attribute_values array allocated
1831 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1832 //
1833 // On return,
1834 // gc_index == 0 indicates no GC statistics available
1835 //
1836 // before_gc_usage and after_gc_usage - filled with per memory pool
1837 // before and after GC usage in the same order as the memory pools
1838 // returned by GetMemoryPools for a given GC memory manager.
1839 // num_gc_ext_attributes indicates the number of elements in
1840 // the gc_ext_attribute_values array is filled; or
1841 // -1 if the gc_ext_attributes_values array is not big enough
1842 //
1843 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1844 ResourceMark rm(THREAD);
1845
1846 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1847 THROW(vmSymbols::java_lang_NullPointerException());
1848 }
1849
1850 // Get the GCMemoryManager
1851 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1852
1853 // Make a copy of the last GC statistics
1854 // GC may occur while constructing the last GC information
1855 int num_pools = MemoryService::num_memory_pools();
1856 GCStatInfo stat(num_pools);
1857 if (mgr->get_last_gc_stat(&stat) == 0) {
1858 gc_stat->gc_index = 0;
1859 return;
1860 }
1861
1862 gc_stat->gc_index = stat.gc_index();
1863 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1864 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1865
1866 // Current implementation does not have GC extension attributes
1867 gc_stat->num_gc_ext_attributes = 0;
1868
1869 // Fill the arrays of MemoryUsage objects with before and after GC
1870 // per pool memory usage
1871 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1872 num_pools,
1873 CHECK);
1874 objArrayHandle usage_before_gc_ah(THREAD, bu);
1875
1876 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1877 num_pools,
1878 CHECK);
1879 objArrayHandle usage_after_gc_ah(THREAD, au);
1880
1881 for (int i = 0; i < num_pools; i++) {
1882 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1883 Handle after_usage;
1884
1885 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1886 if (u.max_size() == 0 && u.used() > 0) {
1887 // If max size == 0, this pool is a survivor space.
1888 // Set max size = -1 since the pools will be swapped after GC.
1889 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1890 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1891 } else {
1892 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1893 }
1894 usage_before_gc_ah->obj_at_put(i, before_usage());
1895 usage_after_gc_ah->obj_at_put(i, after_usage());
1896 }
1897
1898 if (gc_stat->gc_ext_attribute_values_size > 0) {
1899 // Current implementation only has 1 attribute (number of GC threads)
1900 // The type is 'I'
1901 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1902 }
1903 JVM_END
1904
1905 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1906 ResourceMark rm(THREAD);
1907 // Get the GCMemoryManager
1908 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1909 mgr->set_notification_enabled(enabled?true:false);
1910 JVM_END
1911
1912 // Dump heap - Returns 0 if succeeds.
1913 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1914 #if INCLUDE_SERVICES
1915 ResourceMark rm(THREAD);
1916 oop on = JNIHandles::resolve_external_guard(outputfile);
1917 if (on == NULL) {
1918 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1919 "Output file name cannot be null.", -1);
1920 }
1921 Handle onhandle(THREAD, on);
1922 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1923 if (name == NULL) {
1924 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1925 "Output file name cannot be null.", -1);
1926 }
1927 HeapDumper dumper(live ? true : false);
1928 if (dumper.dump(name) != 0) {
1929 const char* errmsg = dumper.error_as_C_string();
1930 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1931 }
1932 return 0;
1933 #else // INCLUDE_SERVICES
1934 return -1;
1935 #endif // INCLUDE_SERVICES
1936 JVM_END
1937
1938 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1939 ResourceMark rm(THREAD);
1940 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1941 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1942 dcmd_list->length(), CHECK_NULL);
1943 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1944 for (int i = 0; i < dcmd_list->length(); i++) {
1945 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1946 cmd_array->obj_at_put(i, cmd_name);
1947 }
1948 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1949 JVM_END
1950
1951 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1952 dcmdInfo* infoArray))
1953 if (cmds == NULL || infoArray == NULL) {
1954 THROW(vmSymbols::java_lang_NullPointerException());
1955 }
1956
1957 ResourceMark rm(THREAD);
1958
1959 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1960 objArrayHandle cmds_ah(THREAD, ca);
1961
1962 // Make sure we have a String array
1963 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1964 if (element_klass != SystemDictionary::String_klass()) {
1965 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1966 "Array element type is not String class");
1967 }
1968
1969 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1970
1971 int num_cmds = cmds_ah->length();
1972 for (int i = 0; i < num_cmds; i++) {
1973 oop cmd = cmds_ah->obj_at(i);
1974 if (cmd == NULL) {
1975 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1976 "Command name cannot be null.");
1977 }
1978 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1979 if (cmd_name == NULL) {
1980 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1981 "Command name cannot be null.");
1982 }
1983 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
1984 if (pos == -1) {
1985 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1986 "Unknown diagnostic command");
1987 }
1988 DCmdInfo* info = info_list->at(pos);
1989 infoArray[i].name = info->name();
1990 infoArray[i].description = info->description();
1991 infoArray[i].impact = info->impact();
1992 JavaPermission p = info->permission();
1993 infoArray[i].permission_class = p._class;
1994 infoArray[i].permission_name = p._name;
1995 infoArray[i].permission_action = p._action;
1996 infoArray[i].num_arguments = info->num_arguments();
1997 infoArray[i].enabled = info->is_enabled();
1998 }
1999 JVM_END
2000
2001 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2002 jstring command, dcmdArgInfo* infoArray))
2003 ResourceMark rm(THREAD);
2004 oop cmd = JNIHandles::resolve_external_guard(command);
2005 if (cmd == NULL) {
2006 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2007 "Command line cannot be null.");
2008 }
2009 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2010 if (cmd_name == NULL) {
2011 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2012 "Command line content cannot be null.");
2013 }
2014 DCmd* dcmd = NULL;
2015 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2016 strlen(cmd_name));
2017 if (factory != NULL) {
2018 dcmd = factory->create_resource_instance(NULL);
2019 }
2020 if (dcmd == NULL) {
2021 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2022 "Unknown diagnostic command");
2023 }
2024 DCmdMark mark(dcmd);
2025 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2026 if (array->length() == 0) {
2027 return;
2028 }
2029 for (int i = 0; i < array->length(); i++) {
2030 infoArray[i].name = array->at(i)->name();
2031 infoArray[i].description = array->at(i)->description();
2032 infoArray[i].type = array->at(i)->type();
2033 infoArray[i].default_string = array->at(i)->default_string();
2034 infoArray[i].mandatory = array->at(i)->is_mandatory();
2035 infoArray[i].option = array->at(i)->is_option();
2036 infoArray[i].multiple = array->at(i)->is_multiple();
2037 infoArray[i].position = array->at(i)->position();
2038 }
2039 return;
2040 JVM_END
2041
2042 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2043 ResourceMark rm(THREAD);
2044 oop cmd = JNIHandles::resolve_external_guard(commandline);
2045 if (cmd == NULL) {
2046 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2047 "Command line cannot be null.");
2048 }
2049 char* cmdline = java_lang_String::as_utf8_string(cmd);
2050 if (cmdline == NULL) {
2051 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2052 "Command line content cannot be null.");
2053 }
2054 bufferedStream output;
2055 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2056 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2057 return (jstring) JNIHandles::make_local(env, result);
2058 JVM_END
2059
2060 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2061 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2062 JVM_END
2063
2064 jlong Management::ticks_to_ms(jlong ticks) {
2065 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2066 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2067 * (double)1000.0);
2068 }
2069 #endif // INCLUDE_MANAGEMENT
2070
2071 // Gets the amount of memory allocated on the Java heap for a single thread.
2072 // Returns -1 if the thread does not exist or has terminated.
2073 JVM_ENTRY(jlong, jmm_GetOneThreadAllocatedMemory(JNIEnv *env, jlong thread_id))
2074 if (thread_id < 0) {
2075 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2076 "Invalid thread ID", -1);
2077 }
2078
2079 if (thread_id == 0) {
2080 // current thread
2081 if (THREAD->is_Java_thread()) {
2082 return ((JavaThread*)THREAD)->cooked_allocated_bytes();
2083 }
2084 return -1;
2085 }
2086
2087 ThreadsListHandle tlh;
2088 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2089
2090 if (java_thread != NULL) {
2091 return java_thread->cooked_allocated_bytes();
2092 }
2093 return -1;
2094 JVM_END
2095
2096 // Gets an array containing the amount of memory allocated on the Java
2097 // heap for a set of threads (in bytes). Each element of the array is
2098 // the amount of memory allocated for the thread ID specified in the
2099 // corresponding entry in the given array of thread IDs; or -1 if the
2100 // thread does not exist or has terminated.
2101 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2102 jlongArray sizeArray))
2103 // Check if threads is null
2104 if (ids == NULL || sizeArray == NULL) {
2105 THROW(vmSymbols::java_lang_NullPointerException());
2106 }
2107
2108 ResourceMark rm(THREAD);
2109 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2110 typeArrayHandle ids_ah(THREAD, ta);
2111
2112 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2113 typeArrayHandle sizeArray_h(THREAD, sa);
2114
2115 // validate the thread id array
2116 validate_thread_id_array(ids_ah, CHECK);
2117
2118 // sizeArray must be of the same length as the given array of thread IDs
2119 int num_threads = ids_ah->length();
2120 if (num_threads != sizeArray_h->length()) {
2121 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2122 "The length of the given long array does not match the length of "
2123 "the given array of thread IDs");
2124 }
2125
2126 ThreadsListHandle tlh;
2127 for (int i = 0; i < num_threads; i++) {
2128 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2129 if (java_thread != NULL) {
2130 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2131 }
2132 }
2133 JVM_END
2134
2135 // Returns the CPU time consumed by a given thread (in nanoseconds).
2136 // If thread_id == 0, CPU time for the current thread is returned.
2137 // If user_sys_cpu_time = true, user level and system CPU time of
2138 // a given thread is returned; otherwise, only user level CPU time
2139 // is returned.
2140 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2141 if (!os::is_thread_cpu_time_supported()) {
2142 return -1;
2143 }
2144
2145 if (thread_id < 0) {
2146 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2147 "Invalid thread ID", -1);
2148 }
2149
2150 JavaThread* java_thread = NULL;
2151 if (thread_id == 0) {
2152 // current thread
2153 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2154 } else {
2155 ThreadsListHandle tlh;
2156 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2157 if (java_thread != NULL) {
2158 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2159 }
2160 }
2161 return -1;
2162 JVM_END
2163
2164 // Gets an array containing the CPU times consumed by a set of threads
2165 // (in nanoseconds). Each element of the array is the CPU time for the
2166 // thread ID specified in the corresponding entry in the given array
2167 // of thread IDs; or -1 if the thread does not exist or has terminated.
2168 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2169 // for the given thread is returned; otherwise, only user level CPU time
2170 // is returned.
2171 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2172 jlongArray timeArray,
2173 jboolean user_sys_cpu_time))
2174 // Check if threads is null
2175 if (ids == NULL || timeArray == NULL) {
2176 THROW(vmSymbols::java_lang_NullPointerException());
2177 }
2178
2179 ResourceMark rm(THREAD);
2180 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2181 typeArrayHandle ids_ah(THREAD, ta);
2182
2183 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2184 typeArrayHandle timeArray_h(THREAD, tia);
2185
2186 // validate the thread id array
2187 validate_thread_id_array(ids_ah, CHECK);
2188
2189 // timeArray must be of the same length as the given array of thread IDs
2190 int num_threads = ids_ah->length();
2191 if (num_threads != timeArray_h->length()) {
2192 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2193 "The length of the given long array does not match the length of "
2194 "the given array of thread IDs");
2195 }
2196
2197 ThreadsListHandle tlh;
2198 for (int i = 0; i < num_threads; i++) {
2199 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2200 if (java_thread != NULL) {
2201 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2202 user_sys_cpu_time != 0));
2203 }
2204 }
2205 JVM_END
2206
2207
2208
2209 #if INCLUDE_MANAGEMENT
2210 const struct jmmInterface_1_ jmm_interface = {
2211 NULL,
2212 NULL,
2213 jmm_GetVersion,
2214 jmm_GetOptionalSupport,
2215 jmm_GetThreadInfo,
2216 jmm_GetMemoryPools,
2217 jmm_GetMemoryManagers,
2218 jmm_GetMemoryPoolUsage,
2219 jmm_GetPeakMemoryPoolUsage,
2220 jmm_GetOneThreadAllocatedMemory,
2221 jmm_GetThreadAllocatedMemory,
2222 jmm_GetMemoryUsage,
2223 jmm_GetLongAttribute,
2224 jmm_GetBoolAttribute,
2225 jmm_SetBoolAttribute,
2226 jmm_GetLongAttributes,
2227 jmm_FindMonitorDeadlockedThreads,
2228 jmm_GetThreadCpuTime,
2229 jmm_GetVMGlobalNames,
2230 jmm_GetVMGlobals,
2231 jmm_GetInternalThreadTimes,
2232 jmm_ResetStatistic,
2233 jmm_SetPoolSensor,
2234 jmm_SetPoolThreshold,
2235 jmm_GetPoolCollectionUsage,
2236 jmm_GetGCExtAttributeInfo,
2237 jmm_GetLastGCStat,
2238 jmm_GetThreadCpuTimeWithKind,
2239 jmm_GetThreadCpuTimesWithKind,
2240 jmm_DumpHeap0,
2241 jmm_FindDeadlockedThreads,
2242 jmm_SetVMGlobal,
2243 NULL,
2244 jmm_DumpThreads,
2245 jmm_SetGCNotificationEnabled,
2246 jmm_GetDiagnosticCommands,
2247 jmm_GetDiagnosticCommandInfo,
2248 jmm_GetDiagnosticCommandArgumentsInfo,
2249 jmm_ExecuteDiagnosticCommand,
2250 jmm_SetDiagnosticFrameworkNotificationEnabled
2251 };
2252 #endif // INCLUDE_MANAGEMENT
2253
2254 void* Management::get_jmm_interface(int version) {
2255 #if INCLUDE_MANAGEMENT
2256 if (version == JMM_VERSION) {
2257 return (void*) &jmm_interface;
2258 }
2259 #endif // INCLUDE_MANAGEMENT
2260 return NULL;
2261 }