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 "oops/typeArrayOop.inline.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals.hpp"
38 #include "runtime/handles.inline.hpp"
39 #include "runtime/interfaceSupport.hpp"
40 #include "runtime/javaCalls.hpp"
41 #include "runtime/jniHandles.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/serviceThread.hpp"
44 #include "runtime/thread.inline.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/macros.hpp"
61
62 PerfVariable* Management::_begin_vm_creation_time = NULL;
63 PerfVariable* Management::_end_vm_creation_time = NULL;
64 PerfVariable* Management::_vm_init_done_time = NULL;
65
66 InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
67 InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
68 InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
69 InstanceKlass* Management::_gcInfo_klass = NULL;
70 InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
71 InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
72 InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
73 InstanceKlass* Management::_memoryUsage_klass = NULL;
74 InstanceKlass* Management::_sensor_klass = NULL;
75 InstanceKlass* Management::_threadInfo_klass = NULL;
76
77 jmmOptionalSupport Management::_optional_support = {0};
78 TimeStamp Management::_stamp;
79
80 void management_init() {
81 #if INCLUDE_MANAGEMENT
82 Management::init();
83 ThreadService::init();
84 RuntimeService::init();
85 ClassLoadingService::init();
86 #else
87 ThreadService::init();
88 #endif // INCLUDE_MANAGEMENT
89 }
90
91 #if INCLUDE_MANAGEMENT
92
93 void Management::init() {
94 EXCEPTION_MARK;
95
96 // These counters are for java.lang.management API support.
97 // They are created even if -XX:-UsePerfData is set and in
98 // that case, they will be allocated on C heap.
99
100 _begin_vm_creation_time =
101 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
102 PerfData::U_None, CHECK);
103
104 _end_vm_creation_time =
105 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
106 PerfData::U_None, CHECK);
107
108 _vm_init_done_time =
109 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
110 PerfData::U_None, CHECK);
111
112 // Initialize optional support
113 _optional_support.isLowMemoryDetectionSupported = 1;
114 _optional_support.isCompilationTimeMonitoringSupported = 1;
115 _optional_support.isThreadContentionMonitoringSupported = 1;
116
117 if (os::is_thread_cpu_time_supported()) {
118 _optional_support.isCurrentThreadCpuTimeSupported = 1;
119 _optional_support.isOtherThreadCpuTimeSupported = 1;
120 } else {
121 _optional_support.isCurrentThreadCpuTimeSupported = 0;
122 _optional_support.isOtherThreadCpuTimeSupported = 0;
123 }
124
125 _optional_support.isObjectMonitorUsageSupported = 1;
126 #if INCLUDE_SERVICES
127 // This depends on the heap inspector
128 _optional_support.isSynchronizerUsageSupported = 1;
129 #endif // INCLUDE_SERVICES
130 _optional_support.isThreadAllocatedMemorySupported = 1;
131 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
132
133 // Registration of the diagnostic commands
134 DCmdRegistrant::register_dcmds();
135 DCmdRegistrant::register_dcmds_ext();
136 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
137 | DCmd_Source_MBean;
138 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
139 }
140
141 void Management::initialize(TRAPS) {
142 // Start the service thread
143 ServiceThread::initialize();
144
145 if (ManagementServer) {
146 ResourceMark rm(THREAD);
147 HandleMark hm(THREAD);
148
149 // Load and initialize the jdk.internal.agent.Agent class
150 // invoke startAgent method to start the management server
151 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
152 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
153 loader,
154 Handle(),
155 THREAD);
156 if (k == NULL) {
157 vm_exit_during_initialization("Management agent initialization failure: "
158 "class jdk.internal.agent.Agent not found.");
159 }
160
161 JavaValue result(T_VOID);
162 JavaCalls::call_static(&result,
163 k,
164 vmSymbols::startAgent_name(),
165 vmSymbols::void_method_signature(),
166 CHECK);
167 }
168 }
169
170 void Management::get_optional_support(jmmOptionalSupport* support) {
171 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
172 }
173
174 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
175 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
176 return initialize_klass(k, CHECK_NULL);
177 }
178
179 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
180 Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
181 if (k == NULL) {
182 return NULL;
183 }
184 return initialize_klass(k, CHECK_NULL);
185 }
186
187 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
188 InstanceKlass* ik = InstanceKlass::cast(k);
189 if (ik->should_be_initialized()) {
190 ik->initialize(CHECK_NULL);
191 }
192 // If these classes change to not be owned by the boot loader, they need
193 // to be walked to keep their class loader alive in oops_do.
194 assert(ik->class_loader() == NULL, "need to follow in oops_do");
195 return ik;
196 }
197
198 void Management::record_vm_startup_time(jlong begin, jlong duration) {
199 // if the performance counter is not initialized,
200 // then vm initialization failed; simply return.
201 if (_begin_vm_creation_time == NULL) return;
202
203 _begin_vm_creation_time->set_value(begin);
204 _end_vm_creation_time->set_value(begin + duration);
205 PerfMemory::set_accessible(true);
206 }
207
208 jlong Management::timestamp() {
209 TimeStamp t;
210 t.update();
211 return t.ticks() - _stamp.ticks();
212 }
213
214 void Management::oops_do(OopClosure* f) {
215 MemoryService::oops_do(f);
216 ThreadService::oops_do(f);
217 }
218
219 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
220 if (_threadInfo_klass == NULL) {
221 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
222 }
223 return _threadInfo_klass;
224 }
225
226 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
227 if (_memoryUsage_klass == NULL) {
228 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
229 }
230 return _memoryUsage_klass;
231 }
232
233 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
234 if (_memoryPoolMXBean_klass == NULL) {
235 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
236 }
237 return _memoryPoolMXBean_klass;
238 }
239
240 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
241 if (_memoryManagerMXBean_klass == NULL) {
242 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
243 }
244 return _memoryManagerMXBean_klass;
245 }
246
247 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
248 if (_garbageCollectorMXBean_klass == NULL) {
249 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
250 }
251 return _garbageCollectorMXBean_klass;
252 }
253
254 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
255 if (_sensor_klass == NULL) {
256 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
257 }
258 return _sensor_klass;
259 }
260
261 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
262 if (_managementFactoryHelper_klass == NULL) {
263 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
264 }
265 return _managementFactoryHelper_klass;
266 }
267
268 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
269 if (_garbageCollectorExtImpl_klass == NULL) {
270 _garbageCollectorExtImpl_klass =
271 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
272 }
273 return _garbageCollectorExtImpl_klass;
274 }
275
276 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
277 if (_gcInfo_klass == NULL) {
278 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
279 }
280 return _gcInfo_klass;
281 }
282
283 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
284 if (_diagnosticCommandImpl_klass == NULL) {
285 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
286 }
287 return _diagnosticCommandImpl_klass;
288 }
289
290 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
291 Handle snapshot_thread(THREAD, snapshot->threadObj());
292
293 jlong contended_time;
294 jlong waited_time;
295 if (ThreadService::is_thread_monitoring_contention()) {
296 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
297 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
298 } else {
299 // set them to -1 if thread contention monitoring is disabled.
300 contended_time = max_julong;
301 waited_time = max_julong;
302 }
303
304 int thread_status = snapshot->thread_status();
305 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
306 if (snapshot->is_ext_suspended()) {
307 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
308 }
309 if (snapshot->is_in_native()) {
310 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
311 }
312
313 ThreadStackTrace* st = snapshot->get_stack_trace();
314 Handle stacktrace_h;
315 if (st != NULL) {
316 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
317 } else {
318 stacktrace_h = Handle();
319 }
320
321 args->push_oop(snapshot_thread);
322 args->push_int(thread_status);
323 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
324 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
325 args->push_long(snapshot->contended_enter_count());
326 args->push_long(contended_time);
327 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
328 args->push_long(waited_time);
329 args->push_oop(stacktrace_h);
330 }
331
332 // Helper function to construct a ThreadInfo object
333 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
334 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
335
336 JavaValue result(T_VOID);
337 JavaCallArguments args(14);
338
339 // First allocate a ThreadObj object and
340 // push the receiver as the first argument
341 Handle element = ik->allocate_instance_handle(CHECK_NULL);
342 args.push_oop(element);
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 JavaCalls::call_special(&result,
349 ik,
350 vmSymbols::object_initializer_name(),
351 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
352 &args,
353 CHECK_NULL);
354
355 return (instanceOop) element();
356 }
357
358 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
359 objArrayHandle monitors_array,
360 typeArrayHandle depths_array,
361 objArrayHandle synchronizers_array,
362 TRAPS) {
363 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
364
365 JavaValue result(T_VOID);
366 JavaCallArguments args(17);
367
368 // First allocate a ThreadObj object and
369 // push the receiver as the first argument
370 Handle element = ik->allocate_instance_handle(CHECK_NULL);
371 args.push_oop(element);
372
373 // initialize the arguments for the ThreadInfo constructor
374 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
375
376 // push the locked monitors and synchronizers in the arguments
377 args.push_oop(monitors_array);
378 args.push_oop(depths_array);
379 args.push_oop(synchronizers_array);
380
381 // Call ThreadInfo constructor with locked monitors and synchronizers
382 JavaCalls::call_special(&result,
383 ik,
384 vmSymbols::object_initializer_name(),
385 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
386 &args,
387 CHECK_NULL);
388
389 return (instanceOop) element();
390 }
391
392
393 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
394 if (mgr == NULL) {
395 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
396 }
397 oop mgr_obj = JNIHandles::resolve(mgr);
398 instanceHandle h(THREAD, (instanceOop) mgr_obj);
399
400 InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
401 if (!h->is_a(k)) {
402 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
403 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
404 NULL);
405 }
406
407 MemoryManager* gc = MemoryService::get_memory_manager(h);
408 if (gc == NULL || !gc->is_gc_memory_manager()) {
409 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
410 "Invalid GC memory manager",
411 NULL);
412 }
413 return (GCMemoryManager*) gc;
414 }
415
416 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
417 if (obj == NULL) {
418 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
419 }
420
421 oop pool_obj = JNIHandles::resolve(obj);
422 assert(pool_obj->is_instance(), "Should be an instanceOop");
423 instanceHandle ph(THREAD, (instanceOop) pool_obj);
424
425 return MemoryService::get_memory_pool(ph);
426 }
427
428 #endif // INCLUDE_MANAGEMENT
429
430 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
431 int num_threads = ids_ah->length();
432
433 // Validate input thread IDs
434 int i = 0;
435 for (i = 0; i < num_threads; i++) {
436 jlong tid = ids_ah->long_at(i);
437 if (tid <= 0) {
438 // throw exception if invalid thread id.
439 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
440 "Invalid thread ID entry");
441 }
442 }
443 }
444
445 #if INCLUDE_MANAGEMENT
446
447 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
448 // check if the element of infoArray is of type ThreadInfo class
449 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
450 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
451 if (element_klass != threadinfo_klass) {
452 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
453 "infoArray element type is not ThreadInfo class");
454 }
455 }
456
457
458 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
459 if (obj == NULL) {
460 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
461 }
462
463 oop mgr_obj = JNIHandles::resolve(obj);
464 assert(mgr_obj->is_instance(), "Should be an instanceOop");
465 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
466
467 return MemoryService::get_memory_manager(mh);
468 }
469
470 // Returns a version string and sets major and minor version if
471 // the input parameters are non-null.
472 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
473 return JMM_VERSION;
474 JVM_END
475
476 // Gets the list of VM monitoring and management optional supports
477 // Returns 0 if succeeded; otherwise returns non-zero.
478 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
479 if (support == NULL) {
480 return -1;
481 }
482 Management::get_optional_support(support);
483 return 0;
484 JVM_END
485
486 // Returns an array of java/lang/management/MemoryPoolMXBean object
487 // one for each memory pool if obj == null; otherwise returns
488 // an array of memory pools for a given memory manager if
489 // it is a valid memory manager.
490 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
491 ResourceMark rm(THREAD);
492
493 int num_memory_pools;
494 MemoryManager* mgr = NULL;
495 if (obj == NULL) {
496 num_memory_pools = MemoryService::num_memory_pools();
497 } else {
498 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
499 if (mgr == NULL) {
500 return NULL;
501 }
502 num_memory_pools = mgr->num_memory_pools();
503 }
504
505 // Allocate the resulting MemoryPoolMXBean[] object
506 InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
507 objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
508 objArrayHandle poolArray(THREAD, r);
509
510 if (mgr == NULL) {
511 // Get all memory pools
512 for (int i = 0; i < num_memory_pools; i++) {
513 MemoryPool* pool = MemoryService::get_memory_pool(i);
514 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
515 instanceHandle ph(THREAD, p);
516 poolArray->obj_at_put(i, ph());
517 }
518 } else {
519 // Get memory pools managed by a given memory manager
520 for (int i = 0; i < num_memory_pools; i++) {
521 MemoryPool* pool = mgr->get_memory_pool(i);
522 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
523 instanceHandle ph(THREAD, p);
524 poolArray->obj_at_put(i, ph());
525 }
526 }
527 return (jobjectArray) JNIHandles::make_local(env, poolArray());
528 JVM_END
529
530 // Returns an array of java/lang/management/MemoryManagerMXBean object
531 // one for each memory manager if obj == null; otherwise returns
532 // an array of memory managers for a given memory pool if
533 // it is a valid memory pool.
534 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
535 ResourceMark rm(THREAD);
536
537 int num_mgrs;
538 MemoryPool* pool = NULL;
539 if (obj == NULL) {
540 num_mgrs = MemoryService::num_memory_managers();
541 } else {
542 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
543 if (pool == NULL) {
544 return NULL;
545 }
546 num_mgrs = pool->num_memory_managers();
547 }
548
549 // Allocate the resulting MemoryManagerMXBean[] object
550 InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
551 objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
552 objArrayHandle mgrArray(THREAD, r);
553
554 if (pool == NULL) {
555 // Get all memory managers
556 for (int i = 0; i < num_mgrs; i++) {
557 MemoryManager* mgr = MemoryService::get_memory_manager(i);
558 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
559 instanceHandle ph(THREAD, p);
560 mgrArray->obj_at_put(i, ph());
561 }
562 } else {
563 // Get memory managers for a given memory pool
564 for (int i = 0; i < num_mgrs; i++) {
565 MemoryManager* mgr = pool->get_memory_manager(i);
566 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
567 instanceHandle ph(THREAD, p);
568 mgrArray->obj_at_put(i, ph());
569 }
570 }
571 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
572 JVM_END
573
574
575 // Returns a java/lang/management/MemoryUsage object containing the memory usage
576 // of a given memory pool.
577 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
578 ResourceMark rm(THREAD);
579
580 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
581 if (pool != NULL) {
582 MemoryUsage usage = pool->get_memory_usage();
583 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
584 return JNIHandles::make_local(env, h());
585 } else {
586 return NULL;
587 }
588 JVM_END
589
590 // Returns a java/lang/management/MemoryUsage object containing the memory usage
591 // of a given memory pool.
592 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
593 ResourceMark rm(THREAD);
594
595 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
596 if (pool != NULL) {
597 MemoryUsage usage = pool->get_peak_memory_usage();
598 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
599 return JNIHandles::make_local(env, h());
600 } else {
601 return NULL;
602 }
603 JVM_END
604
605 // Returns a java/lang/management/MemoryUsage object containing the memory usage
606 // of a given memory pool after most recent GC.
607 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
608 ResourceMark rm(THREAD);
609
610 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
611 if (pool != NULL && pool->is_collected_pool()) {
612 MemoryUsage usage = pool->get_last_collection_usage();
613 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
614 return JNIHandles::make_local(env, h());
615 } else {
616 return NULL;
617 }
618 JVM_END
619
620 // Sets the memory pool sensor for a threshold type
621 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
622 if (obj == NULL || sensorObj == NULL) {
623 THROW(vmSymbols::java_lang_NullPointerException());
624 }
625
626 InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
627 oop s = JNIHandles::resolve(sensorObj);
628 assert(s->is_instance(), "Sensor should be an instanceOop");
629 instanceHandle sensor_h(THREAD, (instanceOop) s);
630 if (!sensor_h->is_a(sensor_klass)) {
631 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
632 "Sensor is not an instance of sun.management.Sensor class");
633 }
634
635 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
636 assert(mpool != NULL, "MemoryPool should exist");
637
638 switch (type) {
639 case JMM_USAGE_THRESHOLD_HIGH:
640 case JMM_USAGE_THRESHOLD_LOW:
641 // have only one sensor for threshold high and low
642 mpool->set_usage_sensor_obj(sensor_h);
643 break;
644 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
645 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
646 // have only one sensor for threshold high and low
647 mpool->set_gc_usage_sensor_obj(sensor_h);
648 break;
649 default:
650 assert(false, "Unrecognized type");
651 }
652
653 JVM_END
654
655
656 // Sets the threshold of a given memory pool.
657 // Returns the previous threshold.
658 //
659 // Input parameters:
660 // pool - the MemoryPoolMXBean object
661 // type - threshold type
662 // threshold - the new threshold (must not be negative)
663 //
664 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
665 if (threshold < 0) {
666 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
667 "Invalid threshold value",
668 -1);
669 }
670
671 if ((size_t)threshold > max_uintx) {
672 stringStream st;
673 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
674 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
675 }
676
677 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
678 assert(pool != NULL, "MemoryPool should exist");
679
680 jlong prev = 0;
681 switch (type) {
682 case JMM_USAGE_THRESHOLD_HIGH:
683 if (!pool->usage_threshold()->is_high_threshold_supported()) {
684 return -1;
685 }
686 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
687 break;
688
689 case JMM_USAGE_THRESHOLD_LOW:
690 if (!pool->usage_threshold()->is_low_threshold_supported()) {
691 return -1;
692 }
693 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
694 break;
695
696 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
697 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
698 return -1;
699 }
700 // return and the new threshold is effective for the next GC
701 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
702
703 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
704 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
705 return -1;
706 }
707 // return and the new threshold is effective for the next GC
708 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
709
710 default:
711 assert(false, "Unrecognized type");
712 return -1;
713 }
714
715 // When the threshold is changed, reevaluate if the low memory
716 // detection is enabled.
717 if (prev != threshold) {
718 LowMemoryDetector::recompute_enabled_for_collected_pools();
719 LowMemoryDetector::detect_low_memory(pool);
720 }
721 return prev;
722 JVM_END
723
724 // Returns a java/lang/management/MemoryUsage object representing
725 // the memory usage for the heap or non-heap memory.
726 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
727 ResourceMark rm(THREAD);
728
729 // Calculate the memory usage
730 size_t total_init = 0;
731 size_t total_used = 0;
732 size_t total_committed = 0;
733 size_t total_max = 0;
734 bool has_undefined_init_size = false;
735 bool has_undefined_max_size = false;
736
737 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
738 MemoryPool* pool = MemoryService::get_memory_pool(i);
739 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
740 MemoryUsage u = pool->get_memory_usage();
741 total_used += u.used();
742 total_committed += u.committed();
743
744 if (u.init_size() == (size_t)-1) {
745 has_undefined_init_size = true;
746 }
747 if (!has_undefined_init_size) {
748 total_init += u.init_size();
749 }
750
751 if (u.max_size() == (size_t)-1) {
752 has_undefined_max_size = true;
753 }
754 if (!has_undefined_max_size) {
755 total_max += u.max_size();
756 }
757 }
758 }
759
760 // if any one of the memory pool has undefined init_size or max_size,
761 // set it to -1
762 if (has_undefined_init_size) {
763 total_init = (size_t)-1;
764 }
765 if (has_undefined_max_size) {
766 total_max = (size_t)-1;
767 }
768
769 MemoryUsage usage((heap ? InitialHeapSize : total_init),
770 total_used,
771 total_committed,
772 (heap ? Universe::heap()->max_capacity() : total_max));
773
774 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
775 return JNIHandles::make_local(env, obj());
776 JVM_END
777
778 // Returns the boolean value of a given attribute.
779 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
780 switch (att) {
781 case JMM_VERBOSE_GC:
782 return MemoryService::get_verbose();
783 case JMM_VERBOSE_CLASS:
784 return ClassLoadingService::get_verbose();
785 case JMM_THREAD_CONTENTION_MONITORING:
786 return ThreadService::is_thread_monitoring_contention();
787 case JMM_THREAD_CPU_TIME:
788 return ThreadService::is_thread_cpu_time_enabled();
789 case JMM_THREAD_ALLOCATED_MEMORY:
790 return ThreadService::is_thread_allocated_memory_enabled();
791 default:
792 assert(0, "Unrecognized attribute");
793 return false;
794 }
795 JVM_END
796
797 // Sets the given boolean attribute and returns the previous value.
798 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
799 switch (att) {
800 case JMM_VERBOSE_GC:
801 return MemoryService::set_verbose(flag != 0);
802 case JMM_VERBOSE_CLASS:
803 return ClassLoadingService::set_verbose(flag != 0);
804 case JMM_THREAD_CONTENTION_MONITORING:
805 return ThreadService::set_thread_monitoring_contention(flag != 0);
806 case JMM_THREAD_CPU_TIME:
807 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
808 case JMM_THREAD_ALLOCATED_MEMORY:
809 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
810 default:
811 assert(0, "Unrecognized attribute");
812 return false;
813 }
814 JVM_END
815
816
817 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
818 switch (att) {
819 case JMM_GC_TIME_MS:
820 return mgr->gc_time_ms();
821
822 case JMM_GC_COUNT:
823 return mgr->gc_count();
824
825 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
826 // current implementation only has 1 ext attribute
827 return 1;
828
829 default:
830 assert(0, "Unrecognized GC attribute");
831 return -1;
832 }
833 }
834
835 class VmThreadCountClosure: public ThreadClosure {
836 private:
837 int _count;
838 public:
839 VmThreadCountClosure() : _count(0) {};
840 void do_thread(Thread* thread);
841 int count() { return _count; }
842 };
843
844 void VmThreadCountClosure::do_thread(Thread* thread) {
845 // exclude externally visible JavaThreads
846 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
847 return;
848 }
849
850 _count++;
851 }
852
853 static jint get_vm_thread_count() {
854 VmThreadCountClosure vmtcc;
855 {
856 MutexLockerEx ml(Threads_lock);
857 Threads::threads_do(&vmtcc);
858 }
859
860 return vmtcc.count();
861 }
862
863 static jint get_num_flags() {
864 // last flag entry is always NULL, so subtract 1
865 int nFlags = (int) Flag::numFlags - 1;
866 int count = 0;
867 for (int i = 0; i < nFlags; i++) {
868 Flag* flag = &Flag::flags[i];
869 // Exclude the locked (diagnostic, experimental) flags
870 if (flag->is_unlocked() || flag->is_unlocker()) {
871 count++;
872 }
873 }
874 return count;
875 }
876
877 static jlong get_long_attribute(jmmLongAttribute att) {
878 switch (att) {
879 case JMM_CLASS_LOADED_COUNT:
880 return ClassLoadingService::loaded_class_count();
881
882 case JMM_CLASS_UNLOADED_COUNT:
883 return ClassLoadingService::unloaded_class_count();
884
885 case JMM_THREAD_TOTAL_COUNT:
886 return ThreadService::get_total_thread_count();
887
888 case JMM_THREAD_LIVE_COUNT:
889 return ThreadService::get_live_thread_count();
890
891 case JMM_THREAD_PEAK_COUNT:
892 return ThreadService::get_peak_thread_count();
893
894 case JMM_THREAD_DAEMON_COUNT:
895 return ThreadService::get_daemon_thread_count();
896
897 case JMM_JVM_INIT_DONE_TIME_MS:
898 return Management::vm_init_done_time();
899
900 case JMM_JVM_UPTIME_MS:
901 return Management::ticks_to_ms(os::elapsed_counter());
902
903 case JMM_COMPILE_TOTAL_TIME_MS:
904 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
905
906 case JMM_OS_PROCESS_ID:
907 return os::current_process_id();
908
909 // Hotspot-specific counters
910 case JMM_CLASS_LOADED_BYTES:
911 return ClassLoadingService::loaded_class_bytes();
912
913 case JMM_CLASS_UNLOADED_BYTES:
914 return ClassLoadingService::unloaded_class_bytes();
915
916 case JMM_SHARED_CLASS_LOADED_COUNT:
917 return ClassLoadingService::loaded_shared_class_count();
918
919 case JMM_SHARED_CLASS_UNLOADED_COUNT:
920 return ClassLoadingService::unloaded_shared_class_count();
921
922
923 case JMM_SHARED_CLASS_LOADED_BYTES:
924 return ClassLoadingService::loaded_shared_class_bytes();
925
926 case JMM_SHARED_CLASS_UNLOADED_BYTES:
927 return ClassLoadingService::unloaded_shared_class_bytes();
928
929 case JMM_TOTAL_CLASSLOAD_TIME_MS:
930 return ClassLoader::classloader_time_ms();
931
932 case JMM_VM_GLOBAL_COUNT:
933 return get_num_flags();
934
935 case JMM_SAFEPOINT_COUNT:
936 return RuntimeService::safepoint_count();
937
938 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
939 return RuntimeService::safepoint_sync_time_ms();
940
941 case JMM_TOTAL_STOPPED_TIME_MS:
942 return RuntimeService::safepoint_time_ms();
943
944 case JMM_TOTAL_APP_TIME_MS:
945 return RuntimeService::application_time_ms();
946
947 case JMM_VM_THREAD_COUNT:
948 return get_vm_thread_count();
949
950 case JMM_CLASS_INIT_TOTAL_COUNT:
951 return ClassLoader::class_init_count();
952
953 case JMM_CLASS_INIT_TOTAL_TIME_MS:
954 return ClassLoader::class_init_time_ms();
955
956 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
957 return ClassLoader::class_verify_time_ms();
958
959 case JMM_METHOD_DATA_SIZE_BYTES:
960 return ClassLoadingService::class_method_data_size();
961
962 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
963 return os::physical_memory();
964
965 default:
966 return -1;
967 }
968 }
969
970
971 // Returns the long value of a given attribute.
972 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
973 if (obj == NULL) {
974 return get_long_attribute(att);
975 } else {
976 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
977 if (mgr != NULL) {
978 return get_gc_attribute(mgr, att);
979 }
980 }
981 return -1;
982 JVM_END
983
984 // Gets the value of all attributes specified in the given array
985 // and sets the value in the result array.
986 // Returns the number of attributes found.
987 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
988 jobject obj,
989 jmmLongAttribute* atts,
990 jint count,
991 jlong* result))
992
993 int num_atts = 0;
994 if (obj == NULL) {
995 for (int i = 0; i < count; i++) {
996 result[i] = get_long_attribute(atts[i]);
997 if (result[i] != -1) {
998 num_atts++;
999 }
1000 }
1001 } else {
1002 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1003 for (int i = 0; i < count; i++) {
1004 result[i] = get_gc_attribute(mgr, atts[i]);
1005 if (result[i] != -1) {
1006 num_atts++;
1007 }
1008 }
1009 }
1010 return num_atts;
1011 JVM_END
1012
1013 // Helper function to do thread dump for a specific list of threads
1014 static void do_thread_dump(ThreadDumpResult* dump_result,
1015 typeArrayHandle ids_ah, // array of thread ID (long[])
1016 int num_threads,
1017 int max_depth,
1018 bool with_locked_monitors,
1019 bool with_locked_synchronizers,
1020 TRAPS) {
1021 // no need to actually perform thread dump if no TIDs are specified
1022 if (num_threads == 0) return;
1023
1024 // First get an array of threadObj handles.
1025 // A JavaThread may terminate before we get the stack trace.
1026 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1027 {
1028 MutexLockerEx ml(Threads_lock);
1029 for (int i = 0; i < num_threads; i++) {
1030 jlong tid = ids_ah->long_at(i);
1031 JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1032 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1033 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1034 thread_handle_array->append(threadObj_h);
1035 }
1036 }
1037
1038 // Obtain thread dumps and thread snapshot information
1039 VM_ThreadDump op(dump_result,
1040 thread_handle_array,
1041 num_threads,
1042 max_depth, /* stack depth */
1043 with_locked_monitors,
1044 with_locked_synchronizers);
1045 VMThread::execute(&op);
1046 }
1047
1048 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1049 // for the thread ID specified in the corresponding entry in
1050 // the given array of thread IDs; or NULL if the thread does not exist
1051 // or has terminated.
1052 //
1053 // Input parameters:
1054 // ids - array of thread IDs
1055 // maxDepth - the maximum depth of stack traces to be dumped:
1056 // maxDepth == -1 requests to dump entire stack trace.
1057 // maxDepth == 0 requests no stack trace.
1058 // infoArray - array of ThreadInfo objects
1059 //
1060 // QQQ - Why does this method return a value instead of void?
1061 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1062 // Check if threads is null
1063 if (ids == NULL || infoArray == NULL) {
1064 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1065 }
1066
1067 if (maxDepth < -1) {
1068 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1069 "Invalid maxDepth", -1);
1070 }
1071
1072 ResourceMark rm(THREAD);
1073 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1074 typeArrayHandle ids_ah(THREAD, ta);
1075
1076 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1077 objArrayOop oa = objArrayOop(infoArray_obj);
1078 objArrayHandle infoArray_h(THREAD, oa);
1079
1080 // validate the thread id array
1081 validate_thread_id_array(ids_ah, CHECK_0);
1082
1083 // validate the ThreadInfo[] parameters
1084 validate_thread_info_array(infoArray_h, CHECK_0);
1085
1086 // infoArray must be of the same length as the given array of thread IDs
1087 int num_threads = ids_ah->length();
1088 if (num_threads != infoArray_h->length()) {
1089 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1090 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1091 }
1092
1093 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1094 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1095
1096 // Must use ThreadDumpResult to store the ThreadSnapshot.
1097 // GC may occur after the thread snapshots are taken but before
1098 // this function returns. The threadObj and other oops kept
1099 // in the ThreadSnapshot are marked and adjusted during GC.
1100 ThreadDumpResult dump_result(num_threads);
1101
1102 if (maxDepth == 0) {
1103 // no stack trace dumped - do not need to stop the world
1104 {
1105 MutexLockerEx ml(Threads_lock);
1106 for (int i = 0; i < num_threads; i++) {
1107 jlong tid = ids_ah->long_at(i);
1108 JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1109 ThreadSnapshot* ts;
1110 if (jt == NULL) {
1111 // if the thread does not exist or now it is terminated,
1112 // create dummy snapshot
1113 ts = new ThreadSnapshot();
1114 } else {
1115 ts = new ThreadSnapshot(jt);
1116 }
1117 dump_result.add_thread_snapshot(ts);
1118 }
1119 }
1120 } else {
1121 // obtain thread dump with the specific list of threads with stack trace
1122 do_thread_dump(&dump_result,
1123 ids_ah,
1124 num_threads,
1125 maxDepth,
1126 false, /* no locked monitor */
1127 false, /* no locked synchronizers */
1128 CHECK_0);
1129 }
1130
1131 int num_snapshots = dump_result.num_snapshots();
1132 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1133 int index = 0;
1134 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1135 // For each thread, create an java/lang/management/ThreadInfo object
1136 // and fill with the thread information
1137
1138 if (ts->threadObj() == NULL) {
1139 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1140 infoArray_h->obj_at_put(index, NULL);
1141 continue;
1142 }
1143
1144 // Create java.lang.management.ThreadInfo object
1145 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1146 infoArray_h->obj_at_put(index, info_obj);
1147 }
1148 return 0;
1149 JVM_END
1150
1151 // Dump thread info for the specified threads.
1152 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1153 // for the thread ID specified in the corresponding entry in
1154 // the given array of thread IDs; or NULL if the thread does not exist
1155 // or has terminated.
1156 //
1157 // Input parameter:
1158 // ids - array of thread IDs; NULL indicates all live threads
1159 // locked_monitors - if true, dump locked object monitors
1160 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1161 //
1162 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1163 ResourceMark rm(THREAD);
1164
1165 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1166 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1167
1168 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1169 int num_threads = (ta != NULL ? ta->length() : 0);
1170 typeArrayHandle ids_ah(THREAD, ta);
1171
1172 ThreadDumpResult dump_result(num_threads); // can safepoint
1173
1174 if (ids_ah() != NULL) {
1175
1176 // validate the thread id array
1177 validate_thread_id_array(ids_ah, CHECK_NULL);
1178
1179 // obtain thread dump of a specific list of threads
1180 do_thread_dump(&dump_result,
1181 ids_ah,
1182 num_threads,
1183 -1, /* entire stack */
1184 (locked_monitors ? true : false), /* with locked monitors */
1185 (locked_synchronizers ? true : false), /* with locked synchronizers */
1186 CHECK_NULL);
1187 } else {
1188 // obtain thread dump of all threads
1189 VM_ThreadDump op(&dump_result,
1190 -1, /* entire stack */
1191 (locked_monitors ? true : false), /* with locked monitors */
1192 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1193 VMThread::execute(&op);
1194 }
1195
1196 int num_snapshots = dump_result.num_snapshots();
1197
1198 // create the result ThreadInfo[] object
1199 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1200 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1201 objArrayHandle result_h(THREAD, r);
1202
1203 int index = 0;
1204 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1205 if (ts->threadObj() == NULL) {
1206 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1207 result_h->obj_at_put(index, NULL);
1208 continue;
1209 }
1210
1211 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1212 assert(stacktrace != NULL, "Must have a stack trace dumped");
1213
1214 // Create Object[] filled with locked monitors
1215 // Create int[] filled with the stack depth where a monitor was locked
1216 int num_frames = stacktrace->get_stack_depth();
1217 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1218
1219 // Count the total number of locked monitors
1220 for (int i = 0; i < num_frames; i++) {
1221 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1222 num_locked_monitors += frame->num_locked_monitors();
1223 }
1224
1225 objArrayHandle monitors_array;
1226 typeArrayHandle depths_array;
1227 objArrayHandle synchronizers_array;
1228
1229 if (locked_monitors) {
1230 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1231 // where the thread locked it
1232 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1233 objArrayHandle mh(THREAD, array);
1234 monitors_array = mh;
1235
1236 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1237 typeArrayHandle dh(THREAD, tarray);
1238 depths_array = dh;
1239
1240 int count = 0;
1241 int j = 0;
1242 for (int depth = 0; depth < num_frames; depth++) {
1243 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1244 int len = frame->num_locked_monitors();
1245 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1246 for (j = 0; j < len; j++) {
1247 oop monitor = locked_monitors->at(j);
1248 assert(monitor != NULL, "must be a Java object");
1249 monitors_array->obj_at_put(count, monitor);
1250 depths_array->int_at_put(count, depth);
1251 count++;
1252 }
1253 }
1254
1255 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1256 for (j = 0; j < jni_locked_monitors->length(); j++) {
1257 oop object = jni_locked_monitors->at(j);
1258 assert(object != NULL, "must be a Java object");
1259 monitors_array->obj_at_put(count, object);
1260 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1261 depths_array->int_at_put(count, -1);
1262 count++;
1263 }
1264 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1265 }
1266
1267 if (locked_synchronizers) {
1268 // Create Object[] filled with locked JSR-166 synchronizers
1269 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1270 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1271 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1272 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1273
1274 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1275 objArrayHandle sh(THREAD, array);
1276 synchronizers_array = sh;
1277
1278 for (int k = 0; k < num_locked_synchronizers; k++) {
1279 synchronizers_array->obj_at_put(k, locks->at(k));
1280 }
1281 }
1282
1283 // Create java.lang.management.ThreadInfo object
1284 instanceOop info_obj = Management::create_thread_info_instance(ts,
1285 monitors_array,
1286 depths_array,
1287 synchronizers_array,
1288 CHECK_NULL);
1289 result_h->obj_at_put(index, info_obj);
1290 }
1291
1292 return (jobjectArray) JNIHandles::make_local(env, result_h());
1293 JVM_END
1294
1295 // Reset statistic. Return true if the requested statistic is reset.
1296 // Otherwise, return false.
1297 //
1298 // Input parameters:
1299 // obj - specify which instance the statistic associated with to be reset
1300 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1301 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1302 // type - the type of statistic to be reset
1303 //
1304 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1305 ResourceMark rm(THREAD);
1306
1307 switch (type) {
1308 case JMM_STAT_PEAK_THREAD_COUNT:
1309 ThreadService::reset_peak_thread_count();
1310 return true;
1311
1312 case JMM_STAT_THREAD_CONTENTION_COUNT:
1313 case JMM_STAT_THREAD_CONTENTION_TIME: {
1314 jlong tid = obj.j;
1315 if (tid < 0) {
1316 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1317 }
1318
1319 // Look for the JavaThread of this given tid
1320 MutexLockerEx ml(Threads_lock);
1321 if (tid == 0) {
1322 // reset contention statistics for all threads if tid == 0
1323 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1324 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1325 ThreadService::reset_contention_count_stat(java_thread);
1326 } else {
1327 ThreadService::reset_contention_time_stat(java_thread);
1328 }
1329 }
1330 } else {
1331 // reset contention statistics for a given thread
1332 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(tid);
1333 if (java_thread == NULL) {
1334 return false;
1335 }
1336
1337 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1338 ThreadService::reset_contention_count_stat(java_thread);
1339 } else {
1340 ThreadService::reset_contention_time_stat(java_thread);
1341 }
1342 }
1343 return true;
1344 break;
1345 }
1346 case JMM_STAT_PEAK_POOL_USAGE: {
1347 jobject o = obj.l;
1348 if (o == NULL) {
1349 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1350 }
1351
1352 oop pool_obj = JNIHandles::resolve(o);
1353 assert(pool_obj->is_instance(), "Should be an instanceOop");
1354 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1355
1356 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1357 if (pool != NULL) {
1358 pool->reset_peak_memory_usage();
1359 return true;
1360 }
1361 break;
1362 }
1363 case JMM_STAT_GC_STAT: {
1364 jobject o = obj.l;
1365 if (o == NULL) {
1366 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1367 }
1368
1369 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1370 if (mgr != NULL) {
1371 mgr->reset_gc_stat();
1372 return true;
1373 }
1374 break;
1375 }
1376 default:
1377 assert(0, "Unknown Statistic Type");
1378 }
1379 return false;
1380 JVM_END
1381
1382 // Returns the fast estimate of CPU time consumed by
1383 // a given thread (in nanoseconds).
1384 // If thread_id == 0, return CPU time for the current thread.
1385 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1386 if (!os::is_thread_cpu_time_supported()) {
1387 return -1;
1388 }
1389
1390 if (thread_id < 0) {
1391 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1392 "Invalid thread ID", -1);
1393 }
1394
1395 JavaThread* java_thread = NULL;
1396 if (thread_id == 0) {
1397 // current thread
1398 return os::current_thread_cpu_time();
1399 } else {
1400 MutexLockerEx ml(Threads_lock);
1401 java_thread = Threads::find_java_thread_from_java_tid(thread_id);
1402 if (java_thread != NULL) {
1403 return os::thread_cpu_time((Thread*) java_thread);
1404 }
1405 }
1406 return -1;
1407 JVM_END
1408
1409 // Returns a String array of all VM global flag names
1410 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1411 // last flag entry is always NULL, so subtract 1
1412 int nFlags = (int) Flag::numFlags - 1;
1413 // allocate a temp array
1414 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1415 nFlags, CHECK_0);
1416 objArrayHandle flags_ah(THREAD, r);
1417 int num_entries = 0;
1418 for (int i = 0; i < nFlags; i++) {
1419 Flag* flag = &Flag::flags[i];
1420 // Exclude notproduct and develop flags in product builds.
1421 if (flag->is_constant_in_binary()) {
1422 continue;
1423 }
1424 // Exclude the locked (experimental, diagnostic) flags
1425 if (flag->is_unlocked() || flag->is_unlocker()) {
1426 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1427 flags_ah->obj_at_put(num_entries, s());
1428 num_entries++;
1429 }
1430 }
1431
1432 if (num_entries < nFlags) {
1433 // Return array of right length
1434 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1435 for(int i = 0; i < num_entries; i++) {
1436 res->obj_at_put(i, flags_ah->obj_at(i));
1437 }
1438 return (jobjectArray)JNIHandles::make_local(env, res);
1439 }
1440
1441 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1442 JVM_END
1443
1444 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1445 // can't be determined, true otherwise. If false is returned, then *global
1446 // will be incomplete and invalid.
1447 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1448 Handle flag_name;
1449 if (name() == NULL) {
1450 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1451 } else {
1452 flag_name = name;
1453 }
1454 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1455
1456 if (flag->is_bool()) {
1457 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1458 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1459 } else if (flag->is_int()) {
1460 global->value.j = (jlong)flag->get_int();
1461 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1462 } else if (flag->is_uint()) {
1463 global->value.j = (jlong)flag->get_uint();
1464 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1465 } else if (flag->is_intx()) {
1466 global->value.j = (jlong)flag->get_intx();
1467 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1468 } else if (flag->is_uintx()) {
1469 global->value.j = (jlong)flag->get_uintx();
1470 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1471 } else if (flag->is_uint64_t()) {
1472 global->value.j = (jlong)flag->get_uint64_t();
1473 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1474 } else if (flag->is_double()) {
1475 global->value.d = (jdouble)flag->get_double();
1476 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1477 } else if (flag->is_size_t()) {
1478 global->value.j = (jlong)flag->get_size_t();
1479 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1480 } else if (flag->is_ccstr()) {
1481 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1482 global->value.l = (jobject)JNIHandles::make_local(env, str());
1483 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1484 } else {
1485 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1486 return false;
1487 }
1488
1489 global->writeable = flag->is_writeable();
1490 global->external = flag->is_external();
1491 switch (flag->get_origin()) {
1492 case Flag::DEFAULT:
1493 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1494 break;
1495 case Flag::COMMAND_LINE:
1496 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1497 break;
1498 case Flag::ENVIRON_VAR:
1499 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1500 break;
1501 case Flag::CONFIG_FILE:
1502 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1503 break;
1504 case Flag::MANAGEMENT:
1505 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1506 break;
1507 case Flag::ERGONOMIC:
1508 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1509 break;
1510 case Flag::ATTACH_ON_DEMAND:
1511 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1512 break;
1513 default:
1514 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1515 }
1516
1517 return true;
1518 }
1519
1520 // Fill globals array of count length with jmmVMGlobal entries
1521 // specified by names. If names == NULL, fill globals array
1522 // with all Flags. Return value is number of entries
1523 // created in globals.
1524 // If a Flag with a given name in an array element does not
1525 // exist, globals[i].name will be set to NULL.
1526 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1527 jobjectArray names,
1528 jmmVMGlobal *globals,
1529 jint count))
1530
1531
1532 if (globals == NULL) {
1533 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1534 }
1535
1536 ResourceMark rm(THREAD);
1537
1538 if (names != NULL) {
1539 // return the requested globals
1540 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1541 objArrayHandle names_ah(THREAD, ta);
1542 // Make sure we have a String array
1543 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1544 if (element_klass != SystemDictionary::String_klass()) {
1545 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1546 "Array element type is not String class", 0);
1547 }
1548
1549 int names_length = names_ah->length();
1550 int num_entries = 0;
1551 for (int i = 0; i < names_length && i < count; i++) {
1552 oop s = names_ah->obj_at(i);
1553 if (s == NULL) {
1554 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1555 }
1556
1557 Handle sh(THREAD, s);
1558 char* str = java_lang_String::as_utf8_string(s);
1559 Flag* flag = Flag::find_flag(str, strlen(str));
1560 if (flag != NULL &&
1561 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1562 num_entries++;
1563 } else {
1564 globals[i].name = NULL;
1565 }
1566 }
1567 return num_entries;
1568 } else {
1569 // return all globals if names == NULL
1570
1571 // last flag entry is always NULL, so subtract 1
1572 int nFlags = (int) Flag::numFlags - 1;
1573 Handle null_h;
1574 int num_entries = 0;
1575 for (int i = 0; i < nFlags && num_entries < count; i++) {
1576 Flag* flag = &Flag::flags[i];
1577 // Exclude notproduct and develop flags in product builds.
1578 if (flag->is_constant_in_binary()) {
1579 continue;
1580 }
1581 // Exclude the locked (diagnostic, experimental) flags
1582 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1583 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1584 num_entries++;
1585 }
1586 }
1587 return num_entries;
1588 }
1589 JVM_END
1590
1591 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1592 ResourceMark rm(THREAD);
1593
1594 oop fn = JNIHandles::resolve_external_guard(flag_name);
1595 if (fn == NULL) {
1596 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1597 "The flag name cannot be null.");
1598 }
1599 char* name = java_lang_String::as_utf8_string(fn);
1600
1601 FormatBuffer<80> error_msg("%s", "");
1602 int succeed = WriteableFlags::set_flag(name, new_value, Flag::MANAGEMENT, error_msg);
1603
1604 if (succeed != Flag::SUCCESS) {
1605 if (succeed == Flag::MISSING_VALUE) {
1606 // missing value causes NPE to be thrown
1607 THROW(vmSymbols::java_lang_NullPointerException());
1608 } else {
1609 // all the other errors are reported as IAE with the appropriate error message
1610 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1611 error_msg.buffer());
1612 }
1613 }
1614 assert(succeed == Flag::SUCCESS, "Setting flag should succeed");
1615 JVM_END
1616
1617 class ThreadTimesClosure: public ThreadClosure {
1618 private:
1619 objArrayHandle _names_strings;
1620 char **_names_chars;
1621 typeArrayHandle _times;
1622 int _names_len;
1623 int _times_len;
1624 int _count;
1625
1626 public:
1627 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1628 ~ThreadTimesClosure();
1629 virtual void do_thread(Thread* thread);
1630 void do_unlocked();
1631 int count() { return _count; }
1632 };
1633
1634 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1635 typeArrayHandle times) {
1636 assert(names() != NULL, "names was NULL");
1637 assert(times() != NULL, "times was NULL");
1638 _names_strings = names;
1639 _names_len = names->length();
1640 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1641 _times = times;
1642 _times_len = times->length();
1643 _count = 0;
1644 }
1645
1646 //
1647 // Called with Threads_lock held
1648 //
1649 void ThreadTimesClosure::do_thread(Thread* thread) {
1650 assert(thread != NULL, "thread was NULL");
1651
1652 // exclude externally visible JavaThreads
1653 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1654 return;
1655 }
1656
1657 if (_count >= _names_len || _count >= _times_len) {
1658 // skip if the result array is not big enough
1659 return;
1660 }
1661
1662 EXCEPTION_MARK;
1663 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1664
1665 assert(thread->name() != NULL, "All threads should have a name");
1666 _names_chars[_count] = os::strdup(thread->name());
1667 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1668 os::thread_cpu_time(thread) : -1);
1669 _count++;
1670 }
1671
1672 // Called without Threads_lock, we can allocate String objects.
1673 void ThreadTimesClosure::do_unlocked() {
1674
1675 EXCEPTION_MARK;
1676 for (int i = 0; i < _count; i++) {
1677 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1678 _names_strings->obj_at_put(i, s());
1679 }
1680 }
1681
1682 ThreadTimesClosure::~ThreadTimesClosure() {
1683 for (int i = 0; i < _count; i++) {
1684 os::free(_names_chars[i]);
1685 }
1686 FREE_C_HEAP_ARRAY(char *, _names_chars);
1687 }
1688
1689 // Fills names with VM internal thread names and times with the corresponding
1690 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1691 // If the element type of names is not String, an IllegalArgumentException is
1692 // thrown.
1693 // If an array is not large enough to hold all the entries, only the entries
1694 // that fit will be returned. Return value is the number of VM internal
1695 // threads entries.
1696 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1697 jobjectArray names,
1698 jlongArray times))
1699 if (names == NULL || times == NULL) {
1700 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1701 }
1702 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1703 objArrayHandle names_ah(THREAD, na);
1704
1705 // Make sure we have a String array
1706 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1707 if (element_klass != SystemDictionary::String_klass()) {
1708 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1709 "Array element type is not String class", 0);
1710 }
1711
1712 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1713 typeArrayHandle times_ah(THREAD, ta);
1714
1715 ThreadTimesClosure ttc(names_ah, times_ah);
1716 {
1717 MutexLockerEx ml(Threads_lock);
1718 Threads::threads_do(&ttc);
1719 }
1720 ttc.do_unlocked();
1721 return ttc.count();
1722 JVM_END
1723
1724 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1725 ResourceMark rm(THREAD);
1726
1727 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1728 VMThread::execute(&op);
1729
1730 DeadlockCycle* deadlocks = op.result();
1731 if (deadlocks == NULL) {
1732 // no deadlock found and return
1733 return Handle();
1734 }
1735
1736 int num_threads = 0;
1737 DeadlockCycle* cycle;
1738 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1739 num_threads += cycle->num_threads();
1740 }
1741
1742 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1743 objArrayHandle threads_ah(THREAD, r);
1744
1745 int index = 0;
1746 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1747 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1748 int len = deadlock_threads->length();
1749 for (int i = 0; i < len; i++) {
1750 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1751 index++;
1752 }
1753 }
1754 return threads_ah;
1755 }
1756
1757 // Finds cycles of threads that are deadlocked involved in object monitors
1758 // and JSR-166 synchronizers.
1759 // Returns an array of Thread objects which are in deadlock, if any.
1760 // Otherwise, returns NULL.
1761 //
1762 // Input parameter:
1763 // object_monitors_only - if true, only check object monitors
1764 //
1765 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1766 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1767 return (jobjectArray) JNIHandles::make_local(env, result());
1768 JVM_END
1769
1770 // Finds cycles of threads that are deadlocked on monitor locks
1771 // Returns an array of Thread objects which are in deadlock, if any.
1772 // Otherwise, returns NULL.
1773 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1774 Handle result = find_deadlocks(true, CHECK_0);
1775 return (jobjectArray) JNIHandles::make_local(env, result());
1776 JVM_END
1777
1778 // Gets the information about GC extension attributes including
1779 // the name of the attribute, its type, and a short description.
1780 //
1781 // Input parameters:
1782 // mgr - GC memory manager
1783 // info - caller allocated array of jmmExtAttributeInfo
1784 // count - number of elements of the info array
1785 //
1786 // Returns the number of GC extension attributes filled in the info array; or
1787 // -1 if info is not big enough
1788 //
1789 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1790 // All GC memory managers have 1 attribute (number of GC threads)
1791 if (count == 0) {
1792 return 0;
1793 }
1794
1795 if (info == NULL) {
1796 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1797 }
1798
1799 info[0].name = "GcThreadCount";
1800 info[0].type = 'I';
1801 info[0].description = "Number of GC threads";
1802 return 1;
1803 JVM_END
1804
1805 // verify the given array is an array of java/lang/management/MemoryUsage objects
1806 // of a given length and return the objArrayOop
1807 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1808 if (array == NULL) {
1809 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1810 }
1811
1812 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1813 objArrayHandle array_h(THREAD, oa);
1814
1815 // array must be of the given length
1816 if (length != array_h->length()) {
1817 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1818 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1819 }
1820
1821 // check if the element of array is of type MemoryUsage class
1822 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1823 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1824 if (element_klass != usage_klass) {
1825 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1826 "The element type is not MemoryUsage class", 0);
1827 }
1828
1829 return array_h();
1830 }
1831
1832 // Gets the statistics of the last GC of a given GC memory manager.
1833 // Input parameters:
1834 // obj - GarbageCollectorMXBean object
1835 // gc_stat - caller allocated jmmGCStat where:
1836 // a. before_gc_usage - array of MemoryUsage objects
1837 // b. after_gc_usage - array of MemoryUsage objects
1838 // c. gc_ext_attributes_values_size is set to the
1839 // gc_ext_attribute_values array allocated
1840 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1841 //
1842 // On return,
1843 // gc_index == 0 indicates no GC statistics available
1844 //
1845 // before_gc_usage and after_gc_usage - filled with per memory pool
1846 // before and after GC usage in the same order as the memory pools
1847 // returned by GetMemoryPools for a given GC memory manager.
1848 // num_gc_ext_attributes indicates the number of elements in
1849 // the gc_ext_attribute_values array is filled; or
1850 // -1 if the gc_ext_attributes_values array is not big enough
1851 //
1852 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1853 ResourceMark rm(THREAD);
1854
1855 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1856 THROW(vmSymbols::java_lang_NullPointerException());
1857 }
1858
1859 // Get the GCMemoryManager
1860 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1861
1862 // Make a copy of the last GC statistics
1863 // GC may occur while constructing the last GC information
1864 int num_pools = MemoryService::num_memory_pools();
1865 GCStatInfo stat(num_pools);
1866 if (mgr->get_last_gc_stat(&stat) == 0) {
1867 gc_stat->gc_index = 0;
1868 return;
1869 }
1870
1871 gc_stat->gc_index = stat.gc_index();
1872 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1873 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1874
1875 // Current implementation does not have GC extension attributes
1876 gc_stat->num_gc_ext_attributes = 0;
1877
1878 // Fill the arrays of MemoryUsage objects with before and after GC
1879 // per pool memory usage
1880 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1881 num_pools,
1882 CHECK);
1883 objArrayHandle usage_before_gc_ah(THREAD, bu);
1884
1885 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1886 num_pools,
1887 CHECK);
1888 objArrayHandle usage_after_gc_ah(THREAD, au);
1889
1890 for (int i = 0; i < num_pools; i++) {
1891 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1892 Handle after_usage;
1893
1894 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1895 if (u.max_size() == 0 && u.used() > 0) {
1896 // If max size == 0, this pool is a survivor space.
1897 // Set max size = -1 since the pools will be swapped after GC.
1898 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1899 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1900 } else {
1901 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1902 }
1903 usage_before_gc_ah->obj_at_put(i, before_usage());
1904 usage_after_gc_ah->obj_at_put(i, after_usage());
1905 }
1906
1907 if (gc_stat->gc_ext_attribute_values_size > 0) {
1908 // Current implementation only has 1 attribute (number of GC threads)
1909 // The type is 'I'
1910 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1911 }
1912 JVM_END
1913
1914 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1915 ResourceMark rm(THREAD);
1916 // Get the GCMemoryManager
1917 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1918 mgr->set_notification_enabled(enabled?true:false);
1919 JVM_END
1920
1921 // Dump heap - Returns 0 if succeeds.
1922 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1923 #if INCLUDE_SERVICES
1924 ResourceMark rm(THREAD);
1925 oop on = JNIHandles::resolve_external_guard(outputfile);
1926 if (on == NULL) {
1927 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1928 "Output file name cannot be null.", -1);
1929 }
1930 Handle onhandle(THREAD, on);
1931 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1932 if (name == NULL) {
1933 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1934 "Output file name cannot be null.", -1);
1935 }
1936 HeapDumper dumper(live ? true : false);
1937 if (dumper.dump(name) != 0) {
1938 const char* errmsg = dumper.error_as_C_string();
1939 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1940 }
1941 return 0;
1942 #else // INCLUDE_SERVICES
1943 return -1;
1944 #endif // INCLUDE_SERVICES
1945 JVM_END
1946
1947 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1948 ResourceMark rm(THREAD);
1949 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1950 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1951 dcmd_list->length(), CHECK_NULL);
1952 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1953 for (int i = 0; i < dcmd_list->length(); i++) {
1954 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1955 cmd_array->obj_at_put(i, cmd_name);
1956 }
1957 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1958 JVM_END
1959
1960 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1961 dcmdInfo* infoArray))
1962 if (cmds == NULL || infoArray == NULL) {
1963 THROW(vmSymbols::java_lang_NullPointerException());
1964 }
1965
1966 ResourceMark rm(THREAD);
1967
1968 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1969 objArrayHandle cmds_ah(THREAD, ca);
1970
1971 // Make sure we have a String array
1972 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1973 if (element_klass != SystemDictionary::String_klass()) {
1974 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1975 "Array element type is not String class");
1976 }
1977
1978 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1979
1980 int num_cmds = cmds_ah->length();
1981 for (int i = 0; i < num_cmds; i++) {
1982 oop cmd = cmds_ah->obj_at(i);
1983 if (cmd == NULL) {
1984 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1985 "Command name cannot be null.");
1986 }
1987 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1988 if (cmd_name == NULL) {
1989 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1990 "Command name cannot be null.");
1991 }
1992 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
1993 if (pos == -1) {
1994 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1995 "Unknown diagnostic command");
1996 }
1997 DCmdInfo* info = info_list->at(pos);
1998 infoArray[i].name = info->name();
1999 infoArray[i].description = info->description();
2000 infoArray[i].impact = info->impact();
2001 JavaPermission p = info->permission();
2002 infoArray[i].permission_class = p._class;
2003 infoArray[i].permission_name = p._name;
2004 infoArray[i].permission_action = p._action;
2005 infoArray[i].num_arguments = info->num_arguments();
2006 infoArray[i].enabled = info->is_enabled();
2007 }
2008 JVM_END
2009
2010 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2011 jstring command, dcmdArgInfo* infoArray))
2012 ResourceMark rm(THREAD);
2013 oop cmd = JNIHandles::resolve_external_guard(command);
2014 if (cmd == NULL) {
2015 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2016 "Command line cannot be null.");
2017 }
2018 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2019 if (cmd_name == NULL) {
2020 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2021 "Command line content cannot be null.");
2022 }
2023 DCmd* dcmd = NULL;
2024 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2025 strlen(cmd_name));
2026 if (factory != NULL) {
2027 dcmd = factory->create_resource_instance(NULL);
2028 }
2029 if (dcmd == NULL) {
2030 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2031 "Unknown diagnostic command");
2032 }
2033 DCmdMark mark(dcmd);
2034 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2035 if (array->length() == 0) {
2036 return;
2037 }
2038 for (int i = 0; i < array->length(); i++) {
2039 infoArray[i].name = array->at(i)->name();
2040 infoArray[i].description = array->at(i)->description();
2041 infoArray[i].type = array->at(i)->type();
2042 infoArray[i].default_string = array->at(i)->default_string();
2043 infoArray[i].mandatory = array->at(i)->is_mandatory();
2044 infoArray[i].option = array->at(i)->is_option();
2045 infoArray[i].multiple = array->at(i)->is_multiple();
2046 infoArray[i].position = array->at(i)->position();
2047 }
2048 return;
2049 JVM_END
2050
2051 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2052 ResourceMark rm(THREAD);
2053 oop cmd = JNIHandles::resolve_external_guard(commandline);
2054 if (cmd == NULL) {
2055 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2056 "Command line cannot be null.");
2057 }
2058 char* cmdline = java_lang_String::as_utf8_string(cmd);
2059 if (cmdline == NULL) {
2060 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2061 "Command line content cannot be null.");
2062 }
2063 bufferedStream output;
2064 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2065 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2066 return (jstring) JNIHandles::make_local(env, result);
2067 JVM_END
2068
2069 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2070 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2071 JVM_END
2072
2073 jlong Management::ticks_to_ms(jlong ticks) {
2074 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2075 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2076 * (double)1000.0);
2077 }
2078 #endif // INCLUDE_MANAGEMENT
2079
2080 // Gets an array containing the amount of memory allocated on the Java
2081 // heap for a set of threads (in bytes). Each element of the array is
2082 // the amount of memory allocated for the thread ID specified in the
2083 // corresponding entry in the given array of thread IDs; or -1 if the
2084 // thread does not exist or has terminated.
2085 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2086 jlongArray sizeArray))
2087 // Check if threads is null
2088 if (ids == NULL || sizeArray == NULL) {
2089 THROW(vmSymbols::java_lang_NullPointerException());
2090 }
2091
2092 ResourceMark rm(THREAD);
2093 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2094 typeArrayHandle ids_ah(THREAD, ta);
2095
2096 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2097 typeArrayHandle sizeArray_h(THREAD, sa);
2098
2099 // validate the thread id array
2100 validate_thread_id_array(ids_ah, CHECK);
2101
2102 // sizeArray must be of the same length as the given array of thread IDs
2103 int num_threads = ids_ah->length();
2104 if (num_threads != sizeArray_h->length()) {
2105 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2106 "The length of the given long array does not match the length of "
2107 "the given array of thread IDs");
2108 }
2109
2110 MutexLockerEx ml(Threads_lock);
2111 for (int i = 0; i < num_threads; i++) {
2112 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2113 if (java_thread != NULL) {
2114 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2115 }
2116 }
2117 JVM_END
2118
2119 // Returns the CPU time consumed by a given thread (in nanoseconds).
2120 // If thread_id == 0, CPU time for the current thread is returned.
2121 // If user_sys_cpu_time = true, user level and system CPU time of
2122 // a given thread is returned; otherwise, only user level CPU time
2123 // is returned.
2124 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2125 if (!os::is_thread_cpu_time_supported()) {
2126 return -1;
2127 }
2128
2129 if (thread_id < 0) {
2130 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2131 "Invalid thread ID", -1);
2132 }
2133
2134 JavaThread* java_thread = NULL;
2135 if (thread_id == 0) {
2136 // current thread
2137 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2138 } else {
2139 MutexLockerEx ml(Threads_lock);
2140 java_thread = Threads::find_java_thread_from_java_tid(thread_id);
2141 if (java_thread != NULL) {
2142 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2143 }
2144 }
2145 return -1;
2146 JVM_END
2147
2148 // Gets an array containing the CPU times consumed by a set of threads
2149 // (in nanoseconds). Each element of the array is the CPU time for the
2150 // thread ID specified in the corresponding entry in the given array
2151 // of thread IDs; or -1 if the thread does not exist or has terminated.
2152 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2153 // for the given thread is returned; otherwise, only user level CPU time
2154 // is returned.
2155 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2156 jlongArray timeArray,
2157 jboolean user_sys_cpu_time))
2158 // Check if threads is null
2159 if (ids == NULL || timeArray == NULL) {
2160 THROW(vmSymbols::java_lang_NullPointerException());
2161 }
2162
2163 ResourceMark rm(THREAD);
2164 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2165 typeArrayHandle ids_ah(THREAD, ta);
2166
2167 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2168 typeArrayHandle timeArray_h(THREAD, tia);
2169
2170 // validate the thread id array
2171 validate_thread_id_array(ids_ah, CHECK);
2172
2173 // timeArray must be of the same length as the given array of thread IDs
2174 int num_threads = ids_ah->length();
2175 if (num_threads != timeArray_h->length()) {
2176 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2177 "The length of the given long array does not match the length of "
2178 "the given array of thread IDs");
2179 }
2180
2181 MutexLockerEx ml(Threads_lock);
2182 for (int i = 0; i < num_threads; i++) {
2183 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2184 if (java_thread != NULL) {
2185 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2186 user_sys_cpu_time != 0));
2187 }
2188 }
2189 JVM_END
2190
2191
2192
2193 #if INCLUDE_MANAGEMENT
2194 const struct jmmInterface_1_ jmm_interface = {
2195 NULL,
2196 NULL,
2197 jmm_GetVersion,
2198 jmm_GetOptionalSupport,
2199 jmm_GetThreadInfo,
2200 jmm_GetMemoryPools,
2201 jmm_GetMemoryManagers,
2202 jmm_GetMemoryPoolUsage,
2203 jmm_GetPeakMemoryPoolUsage,
2204 jmm_GetThreadAllocatedMemory,
2205 jmm_GetMemoryUsage,
2206 jmm_GetLongAttribute,
2207 jmm_GetBoolAttribute,
2208 jmm_SetBoolAttribute,
2209 jmm_GetLongAttributes,
2210 jmm_FindMonitorDeadlockedThreads,
2211 jmm_GetThreadCpuTime,
2212 jmm_GetVMGlobalNames,
2213 jmm_GetVMGlobals,
2214 jmm_GetInternalThreadTimes,
2215 jmm_ResetStatistic,
2216 jmm_SetPoolSensor,
2217 jmm_SetPoolThreshold,
2218 jmm_GetPoolCollectionUsage,
2219 jmm_GetGCExtAttributeInfo,
2220 jmm_GetLastGCStat,
2221 jmm_GetThreadCpuTimeWithKind,
2222 jmm_GetThreadCpuTimesWithKind,
2223 jmm_DumpHeap0,
2224 jmm_FindDeadlockedThreads,
2225 jmm_SetVMGlobal,
2226 NULL,
2227 jmm_DumpThreads,
2228 jmm_SetGCNotificationEnabled,
2229 jmm_GetDiagnosticCommands,
2230 jmm_GetDiagnosticCommandInfo,
2231 jmm_GetDiagnosticCommandArgumentsInfo,
2232 jmm_ExecuteDiagnosticCommand,
2233 jmm_SetDiagnosticFrameworkNotificationEnabled
2234 };
2235 #endif // INCLUDE_MANAGEMENT
2236
2237 void* Management::get_jmm_interface(int version) {
2238 #if INCLUDE_MANAGEMENT
2239 if (version == JMM_VERSION_1_0) {
2240 return (void*) &jmm_interface;
2241 }
2242 #endif // INCLUDE_MANAGEMENT
2243 return NULL;
2244 }