1 /*
2 * Copyright (c) 2003, 2017, 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 "classfile/systemDictionary.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "memory/iterator.hpp"
29 #include "memory/oopFactory.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/klass.hpp"
32 #include "oops/objArrayKlass.hpp"
33 #include "oops/objArrayOop.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "runtime/interfaceSupport.hpp"
39 #include "runtime/javaCalls.hpp"
40 #include "runtime/jniHandles.hpp"
41 #include "runtime/os.hpp"
42 #include "runtime/serviceThread.hpp"
43 #include "runtime/thread.inline.hpp"
44 #include "runtime/threadSMR.hpp"
45 #include "services/classLoadingService.hpp"
46 #include "services/diagnosticCommand.hpp"
47 #include "services/diagnosticFramework.hpp"
48 #include "services/writeableFlags.hpp"
49 #include "services/heapDumper.hpp"
50 #include "services/jmm.h"
51 #include "services/lowMemoryDetector.hpp"
52 #include "services/gcNotifier.hpp"
53 #include "services/nmtDCmd.hpp"
54 #include "services/management.hpp"
55 #include "services/memoryManager.hpp"
56 #include "services/memoryPool.hpp"
57 #include "services/memoryService.hpp"
58 #include "services/runtimeService.hpp"
59 #include "services/threadService.hpp"
60 #include "utilities/debug.hpp"
61 #include "utilities/formatBuffer.hpp"
62 #include "utilities/macros.hpp"
63
64 PerfVariable* Management::_begin_vm_creation_time = NULL;
65 PerfVariable* Management::_end_vm_creation_time = NULL;
66 PerfVariable* Management::_vm_init_done_time = NULL;
67
68 InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
69 InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
70 InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
71 InstanceKlass* Management::_gcInfo_klass = NULL;
72 InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
73 InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
74 InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
75 InstanceKlass* Management::_memoryUsage_klass = NULL;
76 InstanceKlass* Management::_sensor_klass = NULL;
77 InstanceKlass* Management::_threadInfo_klass = NULL;
78
79 jmmOptionalSupport Management::_optional_support = {0};
80 TimeStamp Management::_stamp;
81
82 void management_init() {
83 #if INCLUDE_MANAGEMENT
84 Management::init();
85 ThreadService::init();
86 RuntimeService::init();
87 ClassLoadingService::init();
88 #else
89 ThreadService::init();
90 #endif // INCLUDE_MANAGEMENT
91 }
92
93 #if INCLUDE_MANAGEMENT
94
95 void Management::init() {
96 EXCEPTION_MARK;
97
98 // These counters are for java.lang.management API support.
99 // They are created even if -XX:-UsePerfData is set and in
100 // that case, they will be allocated on C heap.
101
102 _begin_vm_creation_time =
103 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
104 PerfData::U_None, CHECK);
105
106 _end_vm_creation_time =
107 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
108 PerfData::U_None, CHECK);
109
110 _vm_init_done_time =
111 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
112 PerfData::U_None, CHECK);
113
114 // Initialize optional support
115 _optional_support.isLowMemoryDetectionSupported = 1;
116 _optional_support.isCompilationTimeMonitoringSupported = 1;
117 _optional_support.isThreadContentionMonitoringSupported = 1;
118
119 if (os::is_thread_cpu_time_supported()) {
120 _optional_support.isCurrentThreadCpuTimeSupported = 1;
121 _optional_support.isOtherThreadCpuTimeSupported = 1;
122 } else {
123 _optional_support.isCurrentThreadCpuTimeSupported = 0;
124 _optional_support.isOtherThreadCpuTimeSupported = 0;
125 }
126
127 _optional_support.isObjectMonitorUsageSupported = 1;
128 #if INCLUDE_SERVICES
129 // This depends on the heap inspector
130 _optional_support.isSynchronizerUsageSupported = 1;
131 #endif // INCLUDE_SERVICES
132 _optional_support.isThreadAllocatedMemorySupported = 1;
133 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
134
135 // Registration of the diagnostic commands
136 DCmdRegistrant::register_dcmds();
137 DCmdRegistrant::register_dcmds_ext();
138 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
139 | DCmd_Source_MBean;
140 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
141 }
142
143 void Management::initialize(TRAPS) {
144 // Start the service thread
145 ServiceThread::initialize();
146
147 if (ManagementServer) {
148 ResourceMark rm(THREAD);
149 HandleMark hm(THREAD);
150
151 // Load and initialize the jdk.internal.agent.Agent class
152 // invoke startAgent method to start the management server
153 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
154 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
155 loader,
156 Handle(),
157 THREAD);
158 if (k == NULL) {
159 vm_exit_during_initialization("Management agent initialization failure: "
160 "class jdk.internal.agent.Agent not found.");
161 }
162
163 JavaValue result(T_VOID);
164 JavaCalls::call_static(&result,
165 k,
166 vmSymbols::startAgent_name(),
167 vmSymbols::void_method_signature(),
168 CHECK);
169 }
170 }
171
172 void Management::get_optional_support(jmmOptionalSupport* support) {
173 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
174 }
175
176 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
177 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
178 return initialize_klass(k, CHECK_NULL);
179 }
180
181 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
182 Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
183 if (k == NULL) {
184 return NULL;
185 }
186 return initialize_klass(k, CHECK_NULL);
187 }
188
189 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
190 InstanceKlass* ik = InstanceKlass::cast(k);
191 if (ik->should_be_initialized()) {
192 ik->initialize(CHECK_NULL);
193 }
194 // If these classes change to not be owned by the boot loader, they need
195 // to be walked to keep their class loader alive in oops_do.
196 assert(ik->class_loader() == NULL, "need to follow in oops_do");
197 return ik;
198 }
199
200 void Management::record_vm_startup_time(jlong begin, jlong duration) {
201 // if the performance counter is not initialized,
202 // then vm initialization failed; simply return.
203 if (_begin_vm_creation_time == NULL) return;
204
205 _begin_vm_creation_time->set_value(begin);
206 _end_vm_creation_time->set_value(begin + duration);
207 PerfMemory::set_accessible(true);
208 }
209
210 jlong Management::timestamp() {
211 TimeStamp t;
212 t.update();
213 return t.ticks() - _stamp.ticks();
214 }
215
216 void Management::oops_do(OopClosure* f) {
217 MemoryService::oops_do(f);
218 ThreadService::oops_do(f);
219 }
220
221 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
222 if (_threadInfo_klass == NULL) {
223 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
224 }
225 return _threadInfo_klass;
226 }
227
228 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
229 if (_memoryUsage_klass == NULL) {
230 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
231 }
232 return _memoryUsage_klass;
233 }
234
235 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
236 if (_memoryPoolMXBean_klass == NULL) {
237 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
238 }
239 return _memoryPoolMXBean_klass;
240 }
241
242 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
243 if (_memoryManagerMXBean_klass == NULL) {
244 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
245 }
246 return _memoryManagerMXBean_klass;
247 }
248
249 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
250 if (_garbageCollectorMXBean_klass == NULL) {
251 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
252 }
253 return _garbageCollectorMXBean_klass;
254 }
255
256 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
257 if (_sensor_klass == NULL) {
258 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
259 }
260 return _sensor_klass;
261 }
262
263 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
264 if (_managementFactoryHelper_klass == NULL) {
265 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
266 }
267 return _managementFactoryHelper_klass;
268 }
269
270 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
271 if (_garbageCollectorExtImpl_klass == NULL) {
272 _garbageCollectorExtImpl_klass =
273 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
274 }
275 return _garbageCollectorExtImpl_klass;
276 }
277
278 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
279 if (_gcInfo_klass == NULL) {
280 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
281 }
282 return _gcInfo_klass;
283 }
284
285 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
286 if (_diagnosticCommandImpl_klass == NULL) {
287 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
288 }
289 return _diagnosticCommandImpl_klass;
290 }
291
292 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
293 Handle snapshot_thread(THREAD, snapshot->threadObj());
294
295 jlong contended_time;
296 jlong waited_time;
297 if (ThreadService::is_thread_monitoring_contention()) {
298 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
299 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
300 } else {
301 // set them to -1 if thread contention monitoring is disabled.
302 contended_time = max_julong;
303 waited_time = max_julong;
304 }
305
306 int thread_status = snapshot->thread_status();
307 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
308 if (snapshot->is_ext_suspended()) {
309 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
310 }
311 if (snapshot->is_in_native()) {
312 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
313 }
314
315 ThreadStackTrace* st = snapshot->get_stack_trace();
316 Handle stacktrace_h;
317 if (st != NULL) {
318 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
319 } else {
320 stacktrace_h = Handle();
321 }
322
323 args->push_oop(snapshot_thread);
324 args->push_int(thread_status);
325 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
326 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
327 args->push_long(snapshot->contended_enter_count());
328 args->push_long(contended_time);
329 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
330 args->push_long(waited_time);
331 args->push_oop(stacktrace_h);
332 }
333
334 // Helper function to construct a ThreadInfo object
335 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
336 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
337
338 JavaValue result(T_VOID);
339 JavaCallArguments args(14);
340
341 // First allocate a ThreadObj object and
342 // push the receiver as the first argument
343 Handle element = ik->allocate_instance_handle(CHECK_NULL);
344 args.push_oop(element);
345
346 // initialize the arguments for the ThreadInfo constructor
347 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
348
349 // Call ThreadInfo constructor with no locked monitors and synchronizers
350 JavaCalls::call_special(&result,
351 ik,
352 vmSymbols::object_initializer_name(),
353 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
354 &args,
355 CHECK_NULL);
356
357 return (instanceOop) element();
358 }
359
360 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
361 objArrayHandle monitors_array,
362 typeArrayHandle depths_array,
363 objArrayHandle synchronizers_array,
364 TRAPS) {
365 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
366
367 JavaValue result(T_VOID);
368 JavaCallArguments args(17);
369
370 // First allocate a ThreadObj object and
371 // push the receiver as the first argument
372 Handle element = ik->allocate_instance_handle(CHECK_NULL);
373 args.push_oop(element);
374
375 // initialize the arguments for the ThreadInfo constructor
376 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
377
378 // push the locked monitors and synchronizers in the arguments
379 args.push_oop(monitors_array);
380 args.push_oop(depths_array);
381 args.push_oop(synchronizers_array);
382
383 // Call ThreadInfo constructor with locked monitors and synchronizers
384 JavaCalls::call_special(&result,
385 ik,
386 vmSymbols::object_initializer_name(),
387 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
388 &args,
389 CHECK_NULL);
390
391 return (instanceOop) element();
392 }
393
394
395 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
396 if (mgr == NULL) {
397 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
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 NULL);
407 }
408
409 MemoryManager* gc = MemoryService::get_memory_manager(h);
410 if (gc == NULL || !gc->is_gc_memory_manager()) {
411 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
412 "Invalid GC memory manager",
413 NULL);
414 }
415 return (GCMemoryManager*) gc;
416 }
417
418 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
419 if (obj == NULL) {
420 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
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 #endif // INCLUDE_MANAGEMENT
431
432 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
433 int num_threads = ids_ah->length();
434
435 // Validate input thread IDs
436 int i = 0;
437 for (i = 0; i < num_threads; i++) {
438 jlong tid = ids_ah->long_at(i);
439 if (tid <= 0) {
440 // throw exception if invalid thread id.
441 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
442 "Invalid thread ID entry");
443 }
444 }
445 }
446
447 #if INCLUDE_MANAGEMENT
448
449 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
450 // check if the element of infoArray is of type ThreadInfo class
451 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
452 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
453 if (element_klass != threadinfo_klass) {
454 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
455 "infoArray element type is not ThreadInfo class");
456 }
457 }
458
459
460 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
461 if (obj == NULL) {
462 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
463 }
464
465 oop mgr_obj = JNIHandles::resolve(obj);
466 assert(mgr_obj->is_instance(), "Should be an instanceOop");
467 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
468
469 return MemoryService::get_memory_manager(mh);
470 }
471
472 // Returns a version string and sets major and minor version if
473 // the input parameters are non-null.
474 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
475 return JMM_VERSION;
476 JVM_END
477
478 // Gets the list of VM monitoring and management optional supports
479 // Returns 0 if succeeded; otherwise returns non-zero.
480 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
481 if (support == NULL) {
482 return -1;
483 }
484 Management::get_optional_support(support);
485 return 0;
486 JVM_END
487
488 // Returns an array of java/lang/management/MemoryPoolMXBean object
489 // one for each memory pool if obj == null; otherwise returns
490 // an array of memory pools for a given memory manager if
491 // it is a valid memory manager.
492 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
493 ResourceMark rm(THREAD);
494
495 int num_memory_pools;
496 MemoryManager* mgr = NULL;
497 if (obj == NULL) {
498 num_memory_pools = MemoryService::num_memory_pools();
499 } else {
500 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
501 if (mgr == NULL) {
502 return NULL;
503 }
504 num_memory_pools = mgr->num_memory_pools();
505 }
506
507 // Allocate the resulting MemoryPoolMXBean[] object
508 InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
509 objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
510 objArrayHandle poolArray(THREAD, r);
511
512 if (mgr == NULL) {
513 // Get all memory pools
514 for (int i = 0; i < num_memory_pools; i++) {
515 MemoryPool* pool = MemoryService::get_memory_pool(i);
516 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
517 instanceHandle ph(THREAD, p);
518 poolArray->obj_at_put(i, ph());
519 }
520 } else {
521 // Get memory pools managed by a given memory manager
522 for (int i = 0; i < num_memory_pools; i++) {
523 MemoryPool* pool = mgr->get_memory_pool(i);
524 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
525 instanceHandle ph(THREAD, p);
526 poolArray->obj_at_put(i, ph());
527 }
528 }
529 return (jobjectArray) JNIHandles::make_local(env, poolArray());
530 JVM_END
531
532 // Returns an array of java/lang/management/MemoryManagerMXBean object
533 // one for each memory manager if obj == null; otherwise returns
534 // an array of memory managers for a given memory pool if
535 // it is a valid memory pool.
536 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
537 ResourceMark rm(THREAD);
538
539 int num_mgrs;
540 MemoryPool* pool = NULL;
541 if (obj == NULL) {
542 num_mgrs = MemoryService::num_memory_managers();
543 } else {
544 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
545 if (pool == NULL) {
546 return NULL;
547 }
548 num_mgrs = pool->num_memory_managers();
549 }
550
551 // Allocate the resulting MemoryManagerMXBean[] object
552 InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
553 objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
554 objArrayHandle mgrArray(THREAD, r);
555
556 if (pool == NULL) {
557 // Get all memory managers
558 for (int i = 0; i < num_mgrs; i++) {
559 MemoryManager* mgr = MemoryService::get_memory_manager(i);
560 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
561 instanceHandle ph(THREAD, p);
562 mgrArray->obj_at_put(i, ph());
563 }
564 } else {
565 // Get memory managers for a given memory pool
566 for (int i = 0; i < num_mgrs; i++) {
567 MemoryManager* mgr = pool->get_memory_manager(i);
568 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
569 instanceHandle ph(THREAD, p);
570 mgrArray->obj_at_put(i, ph());
571 }
572 }
573 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
574 JVM_END
575
576
577 // Returns a java/lang/management/MemoryUsage object containing the memory usage
578 // of a given memory pool.
579 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
580 ResourceMark rm(THREAD);
581
582 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
583 if (pool != NULL) {
584 MemoryUsage usage = pool->get_memory_usage();
585 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
586 return JNIHandles::make_local(env, h());
587 } else {
588 return NULL;
589 }
590 JVM_END
591
592 // Returns a java/lang/management/MemoryUsage object containing the memory usage
593 // of a given memory pool.
594 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
595 ResourceMark rm(THREAD);
596
597 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
598 if (pool != NULL) {
599 MemoryUsage usage = pool->get_peak_memory_usage();
600 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
601 return JNIHandles::make_local(env, h());
602 } else {
603 return NULL;
604 }
605 JVM_END
606
607 // Returns a java/lang/management/MemoryUsage object containing the memory usage
608 // of a given memory pool after most recent GC.
609 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
610 ResourceMark rm(THREAD);
611
612 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
613 if (pool != NULL && pool->is_collected_pool()) {
614 MemoryUsage usage = pool->get_last_collection_usage();
615 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
616 return JNIHandles::make_local(env, h());
617 } else {
618 return NULL;
619 }
620 JVM_END
621
622 // Sets the memory pool sensor for a threshold type
623 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
624 if (obj == NULL || sensorObj == NULL) {
625 THROW(vmSymbols::java_lang_NullPointerException());
626 }
627
628 InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
629 oop s = JNIHandles::resolve(sensorObj);
630 assert(s->is_instance(), "Sensor should be an instanceOop");
631 instanceHandle sensor_h(THREAD, (instanceOop) s);
632 if (!sensor_h->is_a(sensor_klass)) {
633 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
634 "Sensor is not an instance of sun.management.Sensor class");
635 }
636
637 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
638 assert(mpool != NULL, "MemoryPool should exist");
639
640 switch (type) {
641 case JMM_USAGE_THRESHOLD_HIGH:
642 case JMM_USAGE_THRESHOLD_LOW:
643 // have only one sensor for threshold high and low
644 mpool->set_usage_sensor_obj(sensor_h);
645 break;
646 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
647 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
648 // have only one sensor for threshold high and low
649 mpool->set_gc_usage_sensor_obj(sensor_h);
650 break;
651 default:
652 assert(false, "Unrecognized type");
653 }
654
655 JVM_END
656
657
658 // Sets the threshold of a given memory pool.
659 // Returns the previous threshold.
660 //
661 // Input parameters:
662 // pool - the MemoryPoolMXBean object
663 // type - threshold type
664 // threshold - the new threshold (must not be negative)
665 //
666 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
667 if (threshold < 0) {
668 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
669 "Invalid threshold value",
670 -1);
671 }
672
673 if ((size_t)threshold > max_uintx) {
674 stringStream st;
675 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
676 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
677 }
678
679 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
680 assert(pool != NULL, "MemoryPool should exist");
681
682 jlong prev = 0;
683 switch (type) {
684 case JMM_USAGE_THRESHOLD_HIGH:
685 if (!pool->usage_threshold()->is_high_threshold_supported()) {
686 return -1;
687 }
688 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
689 break;
690
691 case JMM_USAGE_THRESHOLD_LOW:
692 if (!pool->usage_threshold()->is_low_threshold_supported()) {
693 return -1;
694 }
695 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
696 break;
697
698 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
699 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
700 return -1;
701 }
702 // return and the new threshold is effective for the next GC
703 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
704
705 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
706 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
707 return -1;
708 }
709 // return and the new threshold is effective for the next GC
710 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
711
712 default:
713 assert(false, "Unrecognized type");
714 return -1;
715 }
716
717 // When the threshold is changed, reevaluate if the low memory
718 // detection is enabled.
719 if (prev != threshold) {
720 LowMemoryDetector::recompute_enabled_for_collected_pools();
721 LowMemoryDetector::detect_low_memory(pool);
722 }
723 return prev;
724 JVM_END
725
726 // Returns a java/lang/management/MemoryUsage object representing
727 // the memory usage for the heap or non-heap memory.
728 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
729 ResourceMark rm(THREAD);
730
731 // Calculate the memory usage
732 size_t total_init = 0;
733 size_t total_used = 0;
734 size_t total_committed = 0;
735 size_t total_max = 0;
736 bool has_undefined_init_size = false;
737 bool has_undefined_max_size = false;
738
739 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
740 MemoryPool* pool = MemoryService::get_memory_pool(i);
741 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
742 MemoryUsage u = pool->get_memory_usage();
743 total_used += u.used();
744 total_committed += u.committed();
745
746 if (u.init_size() == (size_t)-1) {
747 has_undefined_init_size = true;
748 }
749 if (!has_undefined_init_size) {
750 total_init += u.init_size();
751 }
752
753 if (u.max_size() == (size_t)-1) {
754 has_undefined_max_size = true;
755 }
756 if (!has_undefined_max_size) {
757 total_max += u.max_size();
758 }
759 }
760 }
761
762 // if any one of the memory pool has undefined init_size or max_size,
763 // set it to -1
764 if (has_undefined_init_size) {
765 total_init = (size_t)-1;
766 }
767 if (has_undefined_max_size) {
768 total_max = (size_t)-1;
769 }
770
771 MemoryUsage usage((heap ? InitialHeapSize : total_init),
772 total_used,
773 total_committed,
774 (heap ? Universe::heap()->max_capacity() : total_max));
775
776 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
777 return JNIHandles::make_local(env, obj());
778 JVM_END
779
780 // Returns the boolean value of a given attribute.
781 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
782 switch (att) {
783 case JMM_VERBOSE_GC:
784 return MemoryService::get_verbose();
785 case JMM_VERBOSE_CLASS:
786 return ClassLoadingService::get_verbose();
787 case JMM_THREAD_CONTENTION_MONITORING:
788 return ThreadService::is_thread_monitoring_contention();
789 case JMM_THREAD_CPU_TIME:
790 return ThreadService::is_thread_cpu_time_enabled();
791 case JMM_THREAD_ALLOCATED_MEMORY:
792 return ThreadService::is_thread_allocated_memory_enabled();
793 default:
794 assert(0, "Unrecognized attribute");
795 return false;
796 }
797 JVM_END
798
799 // Sets the given boolean attribute and returns the previous value.
800 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
801 switch (att) {
802 case JMM_VERBOSE_GC:
803 return MemoryService::set_verbose(flag != 0);
804 case JMM_VERBOSE_CLASS:
805 return ClassLoadingService::set_verbose(flag != 0);
806 case JMM_THREAD_CONTENTION_MONITORING:
807 return ThreadService::set_thread_monitoring_contention(flag != 0);
808 case JMM_THREAD_CPU_TIME:
809 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
810 case JMM_THREAD_ALLOCATED_MEMORY:
811 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
812 default:
813 assert(0, "Unrecognized attribute");
814 return false;
815 }
816 JVM_END
817
818
819 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
820 switch (att) {
821 case JMM_GC_TIME_MS:
822 return mgr->gc_time_ms();
823
824 case JMM_GC_COUNT:
825 return mgr->gc_count();
826
827 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
828 // current implementation only has 1 ext attribute
829 return 1;
830
831 default:
832 assert(0, "Unrecognized GC attribute");
833 return -1;
834 }
835 }
836
837 class VmThreadCountClosure: public ThreadClosure {
838 private:
839 int _count;
840 public:
841 VmThreadCountClosure() : _count(0) {};
842 void do_thread(Thread* thread);
843 int count() { return _count; }
844 };
845
846 void VmThreadCountClosure::do_thread(Thread* thread) {
847 // exclude externally visible JavaThreads
848 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
849 return;
850 }
851
852 _count++;
853 }
854
855 static jint get_vm_thread_count() {
856 VmThreadCountClosure vmtcc;
857 {
858 MutexLockerEx ml(Threads_lock);
859 Threads::threads_do(&vmtcc);
860 }
861
862 return vmtcc.count();
863 }
864
865 static jint get_num_flags() {
866 // last flag entry is always NULL, so subtract 1
867 int nFlags = (int) Flag::numFlags - 1;
868 int count = 0;
869 for (int i = 0; i < nFlags; i++) {
870 Flag* flag = &Flag::flags[i];
871 // Exclude the locked (diagnostic, experimental) flags
872 if (flag->is_unlocked() || flag->is_unlocker()) {
873 count++;
874 }
875 }
876 return count;
877 }
878
879 static jlong get_long_attribute(jmmLongAttribute att) {
880 switch (att) {
881 case JMM_CLASS_LOADED_COUNT:
882 return ClassLoadingService::loaded_class_count();
883
884 case JMM_CLASS_UNLOADED_COUNT:
885 return ClassLoadingService::unloaded_class_count();
886
887 case JMM_THREAD_TOTAL_COUNT:
888 return ThreadService::get_total_thread_count();
889
890 case JMM_THREAD_LIVE_COUNT:
891 return ThreadService::get_live_thread_count();
892
893 case JMM_THREAD_PEAK_COUNT:
894 return ThreadService::get_peak_thread_count();
895
896 case JMM_THREAD_DAEMON_COUNT:
897 return ThreadService::get_daemon_thread_count();
898
899 case JMM_JVM_INIT_DONE_TIME_MS:
900 return Management::vm_init_done_time();
901
902 case JMM_JVM_UPTIME_MS:
903 return Management::ticks_to_ms(os::elapsed_counter());
904
905 case JMM_COMPILE_TOTAL_TIME_MS:
906 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
907
908 case JMM_OS_PROCESS_ID:
909 return os::current_process_id();
910
911 // Hotspot-specific counters
912 case JMM_CLASS_LOADED_BYTES:
913 return ClassLoadingService::loaded_class_bytes();
914
915 case JMM_CLASS_UNLOADED_BYTES:
916 return ClassLoadingService::unloaded_class_bytes();
917
918 case JMM_SHARED_CLASS_LOADED_COUNT:
919 return ClassLoadingService::loaded_shared_class_count();
920
921 case JMM_SHARED_CLASS_UNLOADED_COUNT:
922 return ClassLoadingService::unloaded_shared_class_count();
923
924
925 case JMM_SHARED_CLASS_LOADED_BYTES:
926 return ClassLoadingService::loaded_shared_class_bytes();
927
928 case JMM_SHARED_CLASS_UNLOADED_BYTES:
929 return ClassLoadingService::unloaded_shared_class_bytes();
930
931 case JMM_TOTAL_CLASSLOAD_TIME_MS:
932 return ClassLoader::classloader_time_ms();
933
934 case JMM_VM_GLOBAL_COUNT:
935 return get_num_flags();
936
937 case JMM_SAFEPOINT_COUNT:
938 return RuntimeService::safepoint_count();
939
940 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
941 return RuntimeService::safepoint_sync_time_ms();
942
943 case JMM_TOTAL_STOPPED_TIME_MS:
944 return RuntimeService::safepoint_time_ms();
945
946 case JMM_TOTAL_APP_TIME_MS:
947 return RuntimeService::application_time_ms();
948
949 case JMM_VM_THREAD_COUNT:
950 return get_vm_thread_count();
951
952 case JMM_CLASS_INIT_TOTAL_COUNT:
953 return ClassLoader::class_init_count();
954
955 case JMM_CLASS_INIT_TOTAL_TIME_MS:
956 return ClassLoader::class_init_time_ms();
957
958 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
959 return ClassLoader::class_verify_time_ms();
960
961 case JMM_METHOD_DATA_SIZE_BYTES:
962 return ClassLoadingService::class_method_data_size();
963
964 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
965 return os::physical_memory();
966
967 default:
968 return -1;
969 }
970 }
971
972
973 // Returns the long value of a given attribute.
974 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
975 if (obj == NULL) {
976 return get_long_attribute(att);
977 } else {
978 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
979 if (mgr != NULL) {
980 return get_gc_attribute(mgr, att);
981 }
982 }
983 return -1;
984 JVM_END
985
986 // Gets the value of all attributes specified in the given array
987 // and sets the value in the result array.
988 // Returns the number of attributes found.
989 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
990 jobject obj,
991 jmmLongAttribute* atts,
992 jint count,
993 jlong* result))
994
995 int num_atts = 0;
996 if (obj == NULL) {
997 for (int i = 0; i < count; i++) {
998 result[i] = get_long_attribute(atts[i]);
999 if (result[i] != -1) {
1000 num_atts++;
1001 }
1002 }
1003 } else {
1004 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1005 for (int i = 0; i < count; i++) {
1006 result[i] = get_gc_attribute(mgr, atts[i]);
1007 if (result[i] != -1) {
1008 num_atts++;
1009 }
1010 }
1011 }
1012 return num_atts;
1013 JVM_END
1014
1015 // Helper function to do thread dump for a specific list of threads
1016 static void do_thread_dump(ThreadDumpResult* dump_result,
1017 typeArrayHandle ids_ah, // array of thread ID (long[])
1018 int num_threads,
1019 int max_depth,
1020 bool with_locked_monitors,
1021 bool with_locked_synchronizers,
1022 TRAPS) {
1023 // no need to actually perform thread dump if no TIDs are specified
1024 if (num_threads == 0) return;
1025
1026 // First get an array of threadObj handles.
1027 // A JavaThread may terminate before we get the stack trace.
1028 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1029
1030 {
1031 // Need this ThreadsListHandle for converting Java thread IDs into
1032 // threadObj handles; dump_result->set_t_list() is called in the
1033 // VM op below so we can't use it yet.
1034 ThreadsListHandle tlh;
1035 for (int i = 0; i < num_threads; i++) {
1036 jlong tid = ids_ah->long_at(i);
1037 JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1038 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1039 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1040 thread_handle_array->append(threadObj_h);
1041 }
1042 }
1043
1044 // Obtain thread dumps and thread snapshot information
1045 VM_ThreadDump op(dump_result,
1046 thread_handle_array,
1047 num_threads,
1048 max_depth, /* stack depth */
1049 with_locked_monitors,
1050 with_locked_synchronizers);
1051 VMThread::execute(&op);
1052 }
1053
1054 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1055 // for the thread ID specified in the corresponding entry in
1056 // the given array of thread IDs; or NULL if the thread does not exist
1057 // or has terminated.
1058 //
1059 // Input parameters:
1060 // ids - array of thread IDs
1061 // maxDepth - the maximum depth of stack traces to be dumped:
1062 // maxDepth == -1 requests to dump entire stack trace.
1063 // maxDepth == 0 requests no stack trace.
1064 // infoArray - array of ThreadInfo objects
1065 //
1066 // QQQ - Why does this method return a value instead of void?
1067 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1068 // Check if threads is null
1069 if (ids == NULL || infoArray == NULL) {
1070 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1071 }
1072
1073 if (maxDepth < -1) {
1074 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1075 "Invalid maxDepth", -1);
1076 }
1077
1078 ResourceMark rm(THREAD);
1079 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1080 typeArrayHandle ids_ah(THREAD, ta);
1081
1082 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1083 objArrayOop oa = objArrayOop(infoArray_obj);
1084 objArrayHandle infoArray_h(THREAD, oa);
1085
1086 // validate the thread id array
1087 validate_thread_id_array(ids_ah, CHECK_0);
1088
1089 // validate the ThreadInfo[] parameters
1090 validate_thread_info_array(infoArray_h, CHECK_0);
1091
1092 // infoArray must be of the same length as the given array of thread IDs
1093 int num_threads = ids_ah->length();
1094 if (num_threads != infoArray_h->length()) {
1095 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1096 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1097 }
1098
1099 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1100 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1101
1102 // Must use ThreadDumpResult to store the ThreadSnapshot.
1103 // GC may occur after the thread snapshots are taken but before
1104 // this function returns. The threadObj and other oops kept
1105 // in the ThreadSnapshot are marked and adjusted during GC.
1106 ThreadDumpResult dump_result(num_threads);
1107
1108 if (maxDepth == 0) {
1109 // No stack trace to dump so we do not need to stop the world.
1110 // Since we never do the VM op here we must set the threads list.
1111 dump_result.set_t_list();
1112 for (int i = 0; i < num_threads; i++) {
1113 jlong tid = ids_ah->long_at(i);
1114 JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1115 ThreadSnapshot* ts;
1116 if (jt == NULL) {
1117 // if the thread does not exist or now it is terminated,
1118 // create dummy snapshot
1119 ts = new ThreadSnapshot();
1120 } else {
1121 ts = new ThreadSnapshot(dump_result.t_list(), jt);
1122 }
1123 dump_result.add_thread_snapshot(ts);
1124 }
1125 } else {
1126 // obtain thread dump with the specific list of threads with stack trace
1127 do_thread_dump(&dump_result,
1128 ids_ah,
1129 num_threads,
1130 maxDepth,
1131 false, /* no locked monitor */
1132 false, /* no locked synchronizers */
1133 CHECK_0);
1134 }
1135
1136 int num_snapshots = dump_result.num_snapshots();
1137 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1138 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1139 int index = 0;
1140 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1141 // For each thread, create an java/lang/management/ThreadInfo object
1142 // and fill with the thread information
1143
1144 if (ts->threadObj() == NULL) {
1145 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1146 infoArray_h->obj_at_put(index, NULL);
1147 continue;
1148 }
1149
1150 // Create java.lang.management.ThreadInfo object
1151 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1152 infoArray_h->obj_at_put(index, info_obj);
1153 }
1154 return 0;
1155 JVM_END
1156
1157 // Dump thread info for the specified threads.
1158 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1159 // for the thread ID specified in the corresponding entry in
1160 // the given array of thread IDs; or NULL if the thread does not exist
1161 // or has terminated.
1162 //
1163 // Input parameter:
1164 // ids - array of thread IDs; NULL indicates all live threads
1165 // locked_monitors - if true, dump locked object monitors
1166 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1167 //
1168 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1169 ResourceMark rm(THREAD);
1170
1171 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1172 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1173
1174 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1175 int num_threads = (ta != NULL ? ta->length() : 0);
1176 typeArrayHandle ids_ah(THREAD, ta);
1177
1178 ThreadDumpResult dump_result(num_threads); // can safepoint
1179
1180 if (ids_ah() != NULL) {
1181
1182 // validate the thread id array
1183 validate_thread_id_array(ids_ah, CHECK_NULL);
1184
1185 // obtain thread dump of a specific list of threads
1186 do_thread_dump(&dump_result,
1187 ids_ah,
1188 num_threads,
1189 -1, /* entire stack */
1190 (locked_monitors ? true : false), /* with locked monitors */
1191 (locked_synchronizers ? true : false), /* with locked synchronizers */
1192 CHECK_NULL);
1193 } else {
1194 // obtain thread dump of all threads
1195 VM_ThreadDump op(&dump_result,
1196 -1, /* entire stack */
1197 (locked_monitors ? true : false), /* with locked monitors */
1198 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1199 VMThread::execute(&op);
1200 }
1201
1202 int num_snapshots = dump_result.num_snapshots();
1203 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1204
1205 // create the result ThreadInfo[] object
1206 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1207 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1208 objArrayHandle result_h(THREAD, r);
1209
1210 int index = 0;
1211 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1212 if (ts->threadObj() == NULL) {
1213 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1214 result_h->obj_at_put(index, NULL);
1215 continue;
1216 }
1217
1218 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1219 assert(stacktrace != NULL, "Must have a stack trace dumped");
1220
1221 // Create Object[] filled with locked monitors
1222 // Create int[] filled with the stack depth where a monitor was locked
1223 int num_frames = stacktrace->get_stack_depth();
1224 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1225
1226 // Count the total number of locked monitors
1227 for (int i = 0; i < num_frames; i++) {
1228 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1229 num_locked_monitors += frame->num_locked_monitors();
1230 }
1231
1232 objArrayHandle monitors_array;
1233 typeArrayHandle depths_array;
1234 objArrayHandle synchronizers_array;
1235
1236 if (locked_monitors) {
1237 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1238 // where the thread locked it
1239 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1240 objArrayHandle mh(THREAD, array);
1241 monitors_array = mh;
1242
1243 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1244 typeArrayHandle dh(THREAD, tarray);
1245 depths_array = dh;
1246
1247 int count = 0;
1248 int j = 0;
1249 for (int depth = 0; depth < num_frames; depth++) {
1250 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1251 int len = frame->num_locked_monitors();
1252 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1253 for (j = 0; j < len; j++) {
1254 oop monitor = locked_monitors->at(j);
1255 assert(monitor != NULL, "must be a Java object");
1256 monitors_array->obj_at_put(count, monitor);
1257 depths_array->int_at_put(count, depth);
1258 count++;
1259 }
1260 }
1261
1262 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1263 for (j = 0; j < jni_locked_monitors->length(); j++) {
1264 oop object = jni_locked_monitors->at(j);
1265 assert(object != NULL, "must be a Java object");
1266 monitors_array->obj_at_put(count, object);
1267 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1268 depths_array->int_at_put(count, -1);
1269 count++;
1270 }
1271 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1272 }
1273
1274 if (locked_synchronizers) {
1275 // Create Object[] filled with locked JSR-166 synchronizers
1276 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1277 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1278 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1279 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1280
1281 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1282 objArrayHandle sh(THREAD, array);
1283 synchronizers_array = sh;
1284
1285 for (int k = 0; k < num_locked_synchronizers; k++) {
1286 synchronizers_array->obj_at_put(k, locks->at(k));
1287 }
1288 }
1289
1290 // Create java.lang.management.ThreadInfo object
1291 instanceOop info_obj = Management::create_thread_info_instance(ts,
1292 monitors_array,
1293 depths_array,
1294 synchronizers_array,
1295 CHECK_NULL);
1296 result_h->obj_at_put(index, info_obj);
1297 }
1298
1299 return (jobjectArray) JNIHandles::make_local(env, result_h());
1300 JVM_END
1301
1302 // Reset statistic. Return true if the requested statistic is reset.
1303 // Otherwise, return false.
1304 //
1305 // Input parameters:
1306 // obj - specify which instance the statistic associated with to be reset
1307 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1308 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1309 // type - the type of statistic to be reset
1310 //
1311 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1312 ResourceMark rm(THREAD);
1313
1314 switch (type) {
1315 case JMM_STAT_PEAK_THREAD_COUNT:
1316 ThreadService::reset_peak_thread_count();
1317 return true;
1318
1319 case JMM_STAT_THREAD_CONTENTION_COUNT:
1320 case JMM_STAT_THREAD_CONTENTION_TIME: {
1321 jlong tid = obj.j;
1322 if (tid < 0) {
1323 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1324 }
1325
1326 // Look for the JavaThread of this given tid
1327 JavaThreadIteratorWithHandle jtiwh;
1328 if (tid == 0) {
1329 // reset contention statistics for all threads if tid == 0
1330 for (; JavaThread *java_thread = jtiwh.next(); ) {
1331 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1332 ThreadService::reset_contention_count_stat(java_thread);
1333 } else {
1334 ThreadService::reset_contention_time_stat(java_thread);
1335 }
1336 }
1337 } else {
1338 // reset contention statistics for a given thread
1339 JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1340 if (java_thread == NULL) {
1341 return false;
1342 }
1343
1344 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1345 ThreadService::reset_contention_count_stat(java_thread);
1346 } else {
1347 ThreadService::reset_contention_time_stat(java_thread);
1348 }
1349 }
1350 return true;
1351 break;
1352 }
1353 case JMM_STAT_PEAK_POOL_USAGE: {
1354 jobject o = obj.l;
1355 if (o == NULL) {
1356 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1357 }
1358
1359 oop pool_obj = JNIHandles::resolve(o);
1360 assert(pool_obj->is_instance(), "Should be an instanceOop");
1361 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1362
1363 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1364 if (pool != NULL) {
1365 pool->reset_peak_memory_usage();
1366 return true;
1367 }
1368 break;
1369 }
1370 case JMM_STAT_GC_STAT: {
1371 jobject o = obj.l;
1372 if (o == NULL) {
1373 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1374 }
1375
1376 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1377 if (mgr != NULL) {
1378 mgr->reset_gc_stat();
1379 return true;
1380 }
1381 break;
1382 }
1383 default:
1384 assert(0, "Unknown Statistic Type");
1385 }
1386 return false;
1387 JVM_END
1388
1389 // Returns the fast estimate of CPU time consumed by
1390 // a given thread (in nanoseconds).
1391 // If thread_id == 0, return CPU time for the current thread.
1392 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1393 if (!os::is_thread_cpu_time_supported()) {
1394 return -1;
1395 }
1396
1397 if (thread_id < 0) {
1398 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1399 "Invalid thread ID", -1);
1400 }
1401
1402 JavaThread* java_thread = NULL;
1403 if (thread_id == 0) {
1404 // current thread
1405 return os::current_thread_cpu_time();
1406 } else {
1407 ThreadsListHandle tlh;
1408 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1409 if (java_thread != NULL) {
1410 return os::thread_cpu_time((Thread*) java_thread);
1411 }
1412 }
1413 return -1;
1414 JVM_END
1415
1416 // Returns a String array of all VM global flag names
1417 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1418 // last flag entry is always NULL, so subtract 1
1419 int nFlags = (int) Flag::numFlags - 1;
1420 // allocate a temp array
1421 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1422 nFlags, CHECK_0);
1423 objArrayHandle flags_ah(THREAD, r);
1424 int num_entries = 0;
1425 for (int i = 0; i < nFlags; i++) {
1426 Flag* flag = &Flag::flags[i];
1427 // Exclude notproduct and develop flags in product builds.
1428 if (flag->is_constant_in_binary()) {
1429 continue;
1430 }
1431 // Exclude the locked (experimental, diagnostic) flags
1432 if (flag->is_unlocked() || flag->is_unlocker()) {
1433 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1434 flags_ah->obj_at_put(num_entries, s());
1435 num_entries++;
1436 }
1437 }
1438
1439 if (num_entries < nFlags) {
1440 // Return array of right length
1441 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1442 for(int i = 0; i < num_entries; i++) {
1443 res->obj_at_put(i, flags_ah->obj_at(i));
1444 }
1445 return (jobjectArray)JNIHandles::make_local(env, res);
1446 }
1447
1448 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1449 JVM_END
1450
1451 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1452 // can't be determined, true otherwise. If false is returned, then *global
1453 // will be incomplete and invalid.
1454 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1455 Handle flag_name;
1456 if (name() == NULL) {
1457 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1458 } else {
1459 flag_name = name;
1460 }
1461 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1462
1463 if (flag->is_bool()) {
1464 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1465 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1466 } else if (flag->is_int()) {
1467 global->value.j = (jlong)flag->get_int();
1468 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1469 } else if (flag->is_uint()) {
1470 global->value.j = (jlong)flag->get_uint();
1471 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1472 } else if (flag->is_intx()) {
1473 global->value.j = (jlong)flag->get_intx();
1474 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1475 } else if (flag->is_uintx()) {
1476 global->value.j = (jlong)flag->get_uintx();
1477 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1478 } else if (flag->is_uint64_t()) {
1479 global->value.j = (jlong)flag->get_uint64_t();
1480 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1481 } else if (flag->is_double()) {
1482 global->value.d = (jdouble)flag->get_double();
1483 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1484 } else if (flag->is_size_t()) {
1485 global->value.j = (jlong)flag->get_size_t();
1486 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1487 } else if (flag->is_ccstr()) {
1488 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1489 global->value.l = (jobject)JNIHandles::make_local(env, str());
1490 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1491 } else {
1492 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1493 return false;
1494 }
1495
1496 global->writeable = flag->is_writeable();
1497 global->external = flag->is_external();
1498 switch (flag->get_origin()) {
1499 case Flag::DEFAULT:
1500 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1501 break;
1502 case Flag::COMMAND_LINE:
1503 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1504 break;
1505 case Flag::ENVIRON_VAR:
1506 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1507 break;
1508 case Flag::CONFIG_FILE:
1509 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1510 break;
1511 case Flag::MANAGEMENT:
1512 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1513 break;
1514 case Flag::ERGONOMIC:
1515 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1516 break;
1517 case Flag::ATTACH_ON_DEMAND:
1518 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1519 break;
1520 default:
1521 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1522 }
1523
1524 return true;
1525 }
1526
1527 // Fill globals array of count length with jmmVMGlobal entries
1528 // specified by names. If names == NULL, fill globals array
1529 // with all Flags. Return value is number of entries
1530 // created in globals.
1531 // If a Flag with a given name in an array element does not
1532 // exist, globals[i].name will be set to NULL.
1533 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1534 jobjectArray names,
1535 jmmVMGlobal *globals,
1536 jint count))
1537
1538
1539 if (globals == NULL) {
1540 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1541 }
1542
1543 ResourceMark rm(THREAD);
1544
1545 if (names != NULL) {
1546 // return the requested globals
1547 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1548 objArrayHandle names_ah(THREAD, ta);
1549 // Make sure we have a String array
1550 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1551 if (element_klass != SystemDictionary::String_klass()) {
1552 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1553 "Array element type is not String class", 0);
1554 }
1555
1556 int names_length = names_ah->length();
1557 int num_entries = 0;
1558 for (int i = 0; i < names_length && i < count; i++) {
1559 oop s = names_ah->obj_at(i);
1560 if (s == NULL) {
1561 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1562 }
1563
1564 Handle sh(THREAD, s);
1565 char* str = java_lang_String::as_utf8_string(s);
1566 Flag* flag = Flag::find_flag(str, strlen(str));
1567 if (flag != NULL &&
1568 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1569 num_entries++;
1570 } else {
1571 globals[i].name = NULL;
1572 }
1573 }
1574 return num_entries;
1575 } else {
1576 // return all globals if names == NULL
1577
1578 // last flag entry is always NULL, so subtract 1
1579 int nFlags = (int) Flag::numFlags - 1;
1580 Handle null_h;
1581 int num_entries = 0;
1582 for (int i = 0; i < nFlags && num_entries < count; i++) {
1583 Flag* flag = &Flag::flags[i];
1584 // Exclude notproduct and develop flags in product builds.
1585 if (flag->is_constant_in_binary()) {
1586 continue;
1587 }
1588 // Exclude the locked (diagnostic, experimental) flags
1589 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1590 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1591 num_entries++;
1592 }
1593 }
1594 return num_entries;
1595 }
1596 JVM_END
1597
1598 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1599 ResourceMark rm(THREAD);
1600
1601 oop fn = JNIHandles::resolve_external_guard(flag_name);
1602 if (fn == NULL) {
1603 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1604 "The flag name cannot be null.");
1605 }
1606 char* name = java_lang_String::as_utf8_string(fn);
1607
1608 FormatBuffer<80> error_msg("%s", "");
1609 int succeed = WriteableFlags::set_flag(name, new_value, Flag::MANAGEMENT, error_msg);
1610
1611 if (succeed != Flag::SUCCESS) {
1612 if (succeed == Flag::MISSING_VALUE) {
1613 // missing value causes NPE to be thrown
1614 THROW(vmSymbols::java_lang_NullPointerException());
1615 } else {
1616 // all the other errors are reported as IAE with the appropriate error message
1617 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1618 error_msg.buffer());
1619 }
1620 }
1621 assert(succeed == Flag::SUCCESS, "Setting flag should succeed");
1622 JVM_END
1623
1624 class ThreadTimesClosure: public ThreadClosure {
1625 private:
1626 objArrayHandle _names_strings;
1627 char **_names_chars;
1628 typeArrayHandle _times;
1629 int _names_len;
1630 int _times_len;
1631 int _count;
1632
1633 public:
1634 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1635 ~ThreadTimesClosure();
1636 virtual void do_thread(Thread* thread);
1637 void do_unlocked();
1638 int count() { return _count; }
1639 };
1640
1641 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1642 typeArrayHandle times) {
1643 assert(names() != NULL, "names was NULL");
1644 assert(times() != NULL, "times was NULL");
1645 _names_strings = names;
1646 _names_len = names->length();
1647 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1648 _times = times;
1649 _times_len = times->length();
1650 _count = 0;
1651 }
1652
1653 //
1654 // Called with Threads_lock held
1655 //
1656 void ThreadTimesClosure::do_thread(Thread* thread) {
1657 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
1658 assert(thread != NULL, "thread was NULL");
1659
1660 // exclude externally visible JavaThreads
1661 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1662 return;
1663 }
1664
1665 if (_count >= _names_len || _count >= _times_len) {
1666 // skip if the result array is not big enough
1667 return;
1668 }
1669
1670 EXCEPTION_MARK;
1671 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1672
1673 assert(thread->name() != NULL, "All threads should have a name");
1674 _names_chars[_count] = os::strdup(thread->name());
1675 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1676 os::thread_cpu_time(thread) : -1);
1677 _count++;
1678 }
1679
1680 // Called without Threads_lock, we can allocate String objects.
1681 void ThreadTimesClosure::do_unlocked() {
1682
1683 EXCEPTION_MARK;
1684 for (int i = 0; i < _count; i++) {
1685 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1686 _names_strings->obj_at_put(i, s());
1687 }
1688 }
1689
1690 ThreadTimesClosure::~ThreadTimesClosure() {
1691 for (int i = 0; i < _count; i++) {
1692 os::free(_names_chars[i]);
1693 }
1694 FREE_C_HEAP_ARRAY(char *, _names_chars);
1695 }
1696
1697 // Fills names with VM internal thread names and times with the corresponding
1698 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1699 // If the element type of names is not String, an IllegalArgumentException is
1700 // thrown.
1701 // If an array is not large enough to hold all the entries, only the entries
1702 // that fit will be returned. Return value is the number of VM internal
1703 // threads entries.
1704 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1705 jobjectArray names,
1706 jlongArray times))
1707 if (names == NULL || times == NULL) {
1708 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1709 }
1710 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1711 objArrayHandle names_ah(THREAD, na);
1712
1713 // Make sure we have a String array
1714 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1715 if (element_klass != SystemDictionary::String_klass()) {
1716 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1717 "Array element type is not String class", 0);
1718 }
1719
1720 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1721 typeArrayHandle times_ah(THREAD, ta);
1722
1723 ThreadTimesClosure ttc(names_ah, times_ah);
1724 {
1725 MutexLockerEx ml(Threads_lock);
1726 Threads::threads_do(&ttc);
1727 }
1728 ttc.do_unlocked();
1729 return ttc.count();
1730 JVM_END
1731
1732 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1733 ResourceMark rm(THREAD);
1734
1735 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1736 VMThread::execute(&op);
1737
1738 DeadlockCycle* deadlocks = op.result();
1739 if (deadlocks == NULL) {
1740 // no deadlock found and return
1741 return Handle();
1742 }
1743
1744 int num_threads = 0;
1745 DeadlockCycle* cycle;
1746 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1747 num_threads += cycle->num_threads();
1748 }
1749
1750 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1751 objArrayHandle threads_ah(THREAD, r);
1752
1753 int index = 0;
1754 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1755 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1756 int len = deadlock_threads->length();
1757 for (int i = 0; i < len; i++) {
1758 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1759 index++;
1760 }
1761 }
1762 return threads_ah;
1763 }
1764
1765 // Finds cycles of threads that are deadlocked involved in object monitors
1766 // and JSR-166 synchronizers.
1767 // Returns an array of Thread objects which are in deadlock, if any.
1768 // Otherwise, returns NULL.
1769 //
1770 // Input parameter:
1771 // object_monitors_only - if true, only check object monitors
1772 //
1773 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1774 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1775 return (jobjectArray) JNIHandles::make_local(env, result());
1776 JVM_END
1777
1778 // Finds cycles of threads that are deadlocked on monitor locks
1779 // Returns an array of Thread objects which are in deadlock, if any.
1780 // Otherwise, returns NULL.
1781 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1782 Handle result = find_deadlocks(true, CHECK_0);
1783 return (jobjectArray) JNIHandles::make_local(env, result());
1784 JVM_END
1785
1786 // Gets the information about GC extension attributes including
1787 // the name of the attribute, its type, and a short description.
1788 //
1789 // Input parameters:
1790 // mgr - GC memory manager
1791 // info - caller allocated array of jmmExtAttributeInfo
1792 // count - number of elements of the info array
1793 //
1794 // Returns the number of GC extension attributes filled in the info array; or
1795 // -1 if info is not big enough
1796 //
1797 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1798 // All GC memory managers have 1 attribute (number of GC threads)
1799 if (count == 0) {
1800 return 0;
1801 }
1802
1803 if (info == NULL) {
1804 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1805 }
1806
1807 info[0].name = "GcThreadCount";
1808 info[0].type = 'I';
1809 info[0].description = "Number of GC threads";
1810 return 1;
1811 JVM_END
1812
1813 // verify the given array is an array of java/lang/management/MemoryUsage objects
1814 // of a given length and return the objArrayOop
1815 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1816 if (array == NULL) {
1817 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1818 }
1819
1820 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1821 objArrayHandle array_h(THREAD, oa);
1822
1823 // array must be of the given length
1824 if (length != array_h->length()) {
1825 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1826 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1827 }
1828
1829 // check if the element of array is of type MemoryUsage class
1830 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1831 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1832 if (element_klass != usage_klass) {
1833 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1834 "The element type is not MemoryUsage class", 0);
1835 }
1836
1837 return array_h();
1838 }
1839
1840 // Gets the statistics of the last GC of a given GC memory manager.
1841 // Input parameters:
1842 // obj - GarbageCollectorMXBean object
1843 // gc_stat - caller allocated jmmGCStat where:
1844 // a. before_gc_usage - array of MemoryUsage objects
1845 // b. after_gc_usage - array of MemoryUsage objects
1846 // c. gc_ext_attributes_values_size is set to the
1847 // gc_ext_attribute_values array allocated
1848 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1849 //
1850 // On return,
1851 // gc_index == 0 indicates no GC statistics available
1852 //
1853 // before_gc_usage and after_gc_usage - filled with per memory pool
1854 // before and after GC usage in the same order as the memory pools
1855 // returned by GetMemoryPools for a given GC memory manager.
1856 // num_gc_ext_attributes indicates the number of elements in
1857 // the gc_ext_attribute_values array is filled; or
1858 // -1 if the gc_ext_attributes_values array is not big enough
1859 //
1860 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1861 ResourceMark rm(THREAD);
1862
1863 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1864 THROW(vmSymbols::java_lang_NullPointerException());
1865 }
1866
1867 // Get the GCMemoryManager
1868 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1869
1870 // Make a copy of the last GC statistics
1871 // GC may occur while constructing the last GC information
1872 int num_pools = MemoryService::num_memory_pools();
1873 GCStatInfo stat(num_pools);
1874 if (mgr->get_last_gc_stat(&stat) == 0) {
1875 gc_stat->gc_index = 0;
1876 return;
1877 }
1878
1879 gc_stat->gc_index = stat.gc_index();
1880 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1881 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1882
1883 // Current implementation does not have GC extension attributes
1884 gc_stat->num_gc_ext_attributes = 0;
1885
1886 // Fill the arrays of MemoryUsage objects with before and after GC
1887 // per pool memory usage
1888 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1889 num_pools,
1890 CHECK);
1891 objArrayHandle usage_before_gc_ah(THREAD, bu);
1892
1893 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1894 num_pools,
1895 CHECK);
1896 objArrayHandle usage_after_gc_ah(THREAD, au);
1897
1898 for (int i = 0; i < num_pools; i++) {
1899 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1900 Handle after_usage;
1901
1902 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1903 if (u.max_size() == 0 && u.used() > 0) {
1904 // If max size == 0, this pool is a survivor space.
1905 // Set max size = -1 since the pools will be swapped after GC.
1906 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1907 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1908 } else {
1909 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1910 }
1911 usage_before_gc_ah->obj_at_put(i, before_usage());
1912 usage_after_gc_ah->obj_at_put(i, after_usage());
1913 }
1914
1915 if (gc_stat->gc_ext_attribute_values_size > 0) {
1916 // Current implementation only has 1 attribute (number of GC threads)
1917 // The type is 'I'
1918 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1919 }
1920 JVM_END
1921
1922 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1923 ResourceMark rm(THREAD);
1924 // Get the GCMemoryManager
1925 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1926 mgr->set_notification_enabled(enabled?true:false);
1927 JVM_END
1928
1929 // Dump heap - Returns 0 if succeeds.
1930 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1931 #if INCLUDE_SERVICES
1932 ResourceMark rm(THREAD);
1933 oop on = JNIHandles::resolve_external_guard(outputfile);
1934 if (on == NULL) {
1935 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1936 "Output file name cannot be null.", -1);
1937 }
1938 Handle onhandle(THREAD, on);
1939 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1940 if (name == NULL) {
1941 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1942 "Output file name cannot be null.", -1);
1943 }
1944 HeapDumper dumper(live ? true : false);
1945 if (dumper.dump(name) != 0) {
1946 const char* errmsg = dumper.error_as_C_string();
1947 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1948 }
1949 return 0;
1950 #else // INCLUDE_SERVICES
1951 return -1;
1952 #endif // INCLUDE_SERVICES
1953 JVM_END
1954
1955 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1956 ResourceMark rm(THREAD);
1957 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1958 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1959 dcmd_list->length(), CHECK_NULL);
1960 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1961 for (int i = 0; i < dcmd_list->length(); i++) {
1962 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1963 cmd_array->obj_at_put(i, cmd_name);
1964 }
1965 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1966 JVM_END
1967
1968 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1969 dcmdInfo* infoArray))
1970 if (cmds == NULL || infoArray == NULL) {
1971 THROW(vmSymbols::java_lang_NullPointerException());
1972 }
1973
1974 ResourceMark rm(THREAD);
1975
1976 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1977 objArrayHandle cmds_ah(THREAD, ca);
1978
1979 // Make sure we have a String array
1980 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1981 if (element_klass != SystemDictionary::String_klass()) {
1982 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1983 "Array element type is not String class");
1984 }
1985
1986 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1987
1988 int num_cmds = cmds_ah->length();
1989 for (int i = 0; i < num_cmds; i++) {
1990 oop cmd = cmds_ah->obj_at(i);
1991 if (cmd == NULL) {
1992 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1993 "Command name cannot be null.");
1994 }
1995 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1996 if (cmd_name == NULL) {
1997 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1998 "Command name cannot be null.");
1999 }
2000 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
2001 if (pos == -1) {
2002 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2003 "Unknown diagnostic command");
2004 }
2005 DCmdInfo* info = info_list->at(pos);
2006 infoArray[i].name = info->name();
2007 infoArray[i].description = info->description();
2008 infoArray[i].impact = info->impact();
2009 JavaPermission p = info->permission();
2010 infoArray[i].permission_class = p._class;
2011 infoArray[i].permission_name = p._name;
2012 infoArray[i].permission_action = p._action;
2013 infoArray[i].num_arguments = info->num_arguments();
2014 infoArray[i].enabled = info->is_enabled();
2015 }
2016 JVM_END
2017
2018 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2019 jstring command, dcmdArgInfo* infoArray))
2020 ResourceMark rm(THREAD);
2021 oop cmd = JNIHandles::resolve_external_guard(command);
2022 if (cmd == NULL) {
2023 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2024 "Command line cannot be null.");
2025 }
2026 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2027 if (cmd_name == NULL) {
2028 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2029 "Command line content cannot be null.");
2030 }
2031 DCmd* dcmd = NULL;
2032 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2033 strlen(cmd_name));
2034 if (factory != NULL) {
2035 dcmd = factory->create_resource_instance(NULL);
2036 }
2037 if (dcmd == NULL) {
2038 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2039 "Unknown diagnostic command");
2040 }
2041 DCmdMark mark(dcmd);
2042 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2043 if (array->length() == 0) {
2044 return;
2045 }
2046 for (int i = 0; i < array->length(); i++) {
2047 infoArray[i].name = array->at(i)->name();
2048 infoArray[i].description = array->at(i)->description();
2049 infoArray[i].type = array->at(i)->type();
2050 infoArray[i].default_string = array->at(i)->default_string();
2051 infoArray[i].mandatory = array->at(i)->is_mandatory();
2052 infoArray[i].option = array->at(i)->is_option();
2053 infoArray[i].multiple = array->at(i)->is_multiple();
2054 infoArray[i].position = array->at(i)->position();
2055 }
2056 return;
2057 JVM_END
2058
2059 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2060 ResourceMark rm(THREAD);
2061 oop cmd = JNIHandles::resolve_external_guard(commandline);
2062 if (cmd == NULL) {
2063 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2064 "Command line cannot be null.");
2065 }
2066 char* cmdline = java_lang_String::as_utf8_string(cmd);
2067 if (cmdline == NULL) {
2068 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2069 "Command line content cannot be null.");
2070 }
2071 bufferedStream output;
2072 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2073 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2074 return (jstring) JNIHandles::make_local(env, result);
2075 JVM_END
2076
2077 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2078 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2079 JVM_END
2080
2081 jlong Management::ticks_to_ms(jlong ticks) {
2082 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2083 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2084 * (double)1000.0);
2085 }
2086 #endif // INCLUDE_MANAGEMENT
2087
2088 // Gets an array containing the amount of memory allocated on the Java
2089 // heap for a set of threads (in bytes). Each element of the array is
2090 // the amount of memory allocated for the thread ID specified in the
2091 // corresponding entry in the given array of thread IDs; or -1 if the
2092 // thread does not exist or has terminated.
2093 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2094 jlongArray sizeArray))
2095 // Check if threads is null
2096 if (ids == NULL || sizeArray == NULL) {
2097 THROW(vmSymbols::java_lang_NullPointerException());
2098 }
2099
2100 ResourceMark rm(THREAD);
2101 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2102 typeArrayHandle ids_ah(THREAD, ta);
2103
2104 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2105 typeArrayHandle sizeArray_h(THREAD, sa);
2106
2107 // validate the thread id array
2108 validate_thread_id_array(ids_ah, CHECK);
2109
2110 // sizeArray must be of the same length as the given array of thread IDs
2111 int num_threads = ids_ah->length();
2112 if (num_threads != sizeArray_h->length()) {
2113 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2114 "The length of the given long array does not match the length of "
2115 "the given array of thread IDs");
2116 }
2117
2118 ThreadsListHandle tlh;
2119 for (int i = 0; i < num_threads; i++) {
2120 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2121 if (java_thread != NULL) {
2122 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2123 }
2124 }
2125 JVM_END
2126
2127 // Returns the CPU time consumed by a given thread (in nanoseconds).
2128 // If thread_id == 0, CPU time for the current thread is returned.
2129 // If user_sys_cpu_time = true, user level and system CPU time of
2130 // a given thread is returned; otherwise, only user level CPU time
2131 // is returned.
2132 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2133 if (!os::is_thread_cpu_time_supported()) {
2134 return -1;
2135 }
2136
2137 if (thread_id < 0) {
2138 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2139 "Invalid thread ID", -1);
2140 }
2141
2142 JavaThread* java_thread = NULL;
2143 if (thread_id == 0) {
2144 // current thread
2145 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2146 } else {
2147 ThreadsListHandle tlh;
2148 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2149 if (java_thread != NULL) {
2150 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2151 }
2152 }
2153 return -1;
2154 JVM_END
2155
2156 // Gets an array containing the CPU times consumed by a set of threads
2157 // (in nanoseconds). Each element of the array is the CPU time for the
2158 // thread ID specified in the corresponding entry in the given array
2159 // of thread IDs; or -1 if the thread does not exist or has terminated.
2160 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2161 // for the given thread is returned; otherwise, only user level CPU time
2162 // is returned.
2163 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2164 jlongArray timeArray,
2165 jboolean user_sys_cpu_time))
2166 // Check if threads is null
2167 if (ids == NULL || timeArray == NULL) {
2168 THROW(vmSymbols::java_lang_NullPointerException());
2169 }
2170
2171 ResourceMark rm(THREAD);
2172 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2173 typeArrayHandle ids_ah(THREAD, ta);
2174
2175 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2176 typeArrayHandle timeArray_h(THREAD, tia);
2177
2178 // validate the thread id array
2179 validate_thread_id_array(ids_ah, CHECK);
2180
2181 // timeArray must be of the same length as the given array of thread IDs
2182 int num_threads = ids_ah->length();
2183 if (num_threads != timeArray_h->length()) {
2184 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2185 "The length of the given long array does not match the length of "
2186 "the given array of thread IDs");
2187 }
2188
2189 ThreadsListHandle tlh;
2190 for (int i = 0; i < num_threads; i++) {
2191 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2192 if (java_thread != NULL) {
2193 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2194 user_sys_cpu_time != 0));
2195 }
2196 }
2197 JVM_END
2198
2199
2200
2201 #if INCLUDE_MANAGEMENT
2202 const struct jmmInterface_1_ jmm_interface = {
2203 NULL,
2204 NULL,
2205 jmm_GetVersion,
2206 jmm_GetOptionalSupport,
2207 jmm_GetThreadInfo,
2208 jmm_GetMemoryPools,
2209 jmm_GetMemoryManagers,
2210 jmm_GetMemoryPoolUsage,
2211 jmm_GetPeakMemoryPoolUsage,
2212 jmm_GetThreadAllocatedMemory,
2213 jmm_GetMemoryUsage,
2214 jmm_GetLongAttribute,
2215 jmm_GetBoolAttribute,
2216 jmm_SetBoolAttribute,
2217 jmm_GetLongAttributes,
2218 jmm_FindMonitorDeadlockedThreads,
2219 jmm_GetThreadCpuTime,
2220 jmm_GetVMGlobalNames,
2221 jmm_GetVMGlobals,
2222 jmm_GetInternalThreadTimes,
2223 jmm_ResetStatistic,
2224 jmm_SetPoolSensor,
2225 jmm_SetPoolThreshold,
2226 jmm_GetPoolCollectionUsage,
2227 jmm_GetGCExtAttributeInfo,
2228 jmm_GetLastGCStat,
2229 jmm_GetThreadCpuTimeWithKind,
2230 jmm_GetThreadCpuTimesWithKind,
2231 jmm_DumpHeap0,
2232 jmm_FindDeadlockedThreads,
2233 jmm_SetVMGlobal,
2234 NULL,
2235 jmm_DumpThreads,
2236 jmm_SetGCNotificationEnabled,
2237 jmm_GetDiagnosticCommands,
2238 jmm_GetDiagnosticCommandInfo,
2239 jmm_GetDiagnosticCommandArgumentsInfo,
2240 jmm_ExecuteDiagnosticCommand,
2241 jmm_SetDiagnosticFrameworkNotificationEnabled
2242 };
2243 #endif // INCLUDE_MANAGEMENT
2244
2245 void* Management::get_jmm_interface(int version) {
2246 #if INCLUDE_MANAGEMENT
2247 if (version == JMM_VERSION_1_0) {
2248 return (void*) &jmm_interface;
2249 }
2250 #endif // INCLUDE_MANAGEMENT
2251 return NULL;
2252 }