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 "services/classLoadingService.hpp"
45 #include "services/diagnosticCommand.hpp"
46 #include "services/diagnosticFramework.hpp"
47 #include "services/writeableFlags.hpp"
48 #include "services/heapDumper.hpp"
49 #include "services/jmm.h"
50 #include "services/lowMemoryDetector.hpp"
51 #include "services/gcNotifier.hpp"
52 #include "services/nmtDCmd.hpp"
53 #include "services/management.hpp"
54 #include "services/memoryManager.hpp"
55 #include "services/memoryPool.hpp"
56 #include "services/memoryService.hpp"
57 #include "services/runtimeService.hpp"
58 #include "services/threadService.hpp"
59 #include "utilities/macros.hpp"
60
61 PerfVariable* Management::_begin_vm_creation_time = NULL;
62 PerfVariable* Management::_end_vm_creation_time = NULL;
63 PerfVariable* Management::_vm_init_done_time = NULL;
64
65 InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
66 InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
67 InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
68 InstanceKlass* Management::_gcInfo_klass = NULL;
69 InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
70 InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
71 InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
72 InstanceKlass* Management::_memoryUsage_klass = NULL;
73 InstanceKlass* Management::_sensor_klass = NULL;
74 InstanceKlass* Management::_threadInfo_klass = NULL;
75
76 jmmOptionalSupport Management::_optional_support = {0};
77 TimeStamp Management::_stamp;
78
79 void management_init() {
80 #if INCLUDE_MANAGEMENT
81 Management::init();
82 ThreadService::init();
83 RuntimeService::init();
84 ClassLoadingService::init();
85 #else
86 ThreadService::init();
87 #endif // INCLUDE_MANAGEMENT
88 }
89
90 #if INCLUDE_MANAGEMENT
91
92 void Management::init() {
93 EXCEPTION_MARK;
94
95 // These counters are for java.lang.management API support.
96 // They are created even if -XX:-UsePerfData is set and in
97 // that case, they will be allocated on C heap.
98
99 _begin_vm_creation_time =
100 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
101 PerfData::U_None, CHECK);
102
103 _end_vm_creation_time =
104 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
105 PerfData::U_None, CHECK);
106
107 _vm_init_done_time =
108 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
109 PerfData::U_None, CHECK);
110
111 // Initialize optional support
112 _optional_support.isLowMemoryDetectionSupported = 1;
113 _optional_support.isCompilationTimeMonitoringSupported = 1;
114 _optional_support.isThreadContentionMonitoringSupported = 1;
115
116 if (os::is_thread_cpu_time_supported()) {
117 _optional_support.isCurrentThreadCpuTimeSupported = 1;
118 _optional_support.isOtherThreadCpuTimeSupported = 1;
119 } else {
120 _optional_support.isCurrentThreadCpuTimeSupported = 0;
121 _optional_support.isOtherThreadCpuTimeSupported = 0;
122 }
123
124 _optional_support.isObjectMonitorUsageSupported = 1;
125 #if INCLUDE_SERVICES
126 // This depends on the heap inspector
127 _optional_support.isSynchronizerUsageSupported = 1;
128 #endif // INCLUDE_SERVICES
129 _optional_support.isThreadAllocatedMemorySupported = 1;
130 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
131
132 // Registration of the diagnostic commands
133 DCmdRegistrant::register_dcmds();
134 DCmdRegistrant::register_dcmds_ext();
135 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
136 | DCmd_Source_MBean;
137 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
138 }
139
140 void Management::initialize(TRAPS) {
141 // Start the service thread
142 ServiceThread::initialize();
143
144 if (ManagementServer) {
145 ResourceMark rm(THREAD);
146 HandleMark hm(THREAD);
147
148 // Load and initialize the jdk.internal.agent.Agent class
149 // invoke startAgent method to start the management server
150 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
151 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
152 loader,
153 Handle(),
154 THREAD);
155 if (k == NULL) {
156 vm_exit_during_initialization("Management agent initialization failure: "
157 "class jdk.internal.agent.Agent not found.");
158 }
159
160 JavaValue result(T_VOID);
161 JavaCalls::call_static(&result,
162 k,
163 vmSymbols::startAgent_name(),
164 vmSymbols::void_method_signature(),
165 CHECK);
166 }
167 }
168
169 void Management::get_optional_support(jmmOptionalSupport* support) {
170 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
171 }
172
173 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
174 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
175 return initialize_klass(k, CHECK_NULL);
176 }
177
178 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
179 Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
180 if (k == NULL) {
181 return NULL;
182 }
183 return initialize_klass(k, CHECK_NULL);
184 }
185
186 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
187 InstanceKlass* ik = InstanceKlass::cast(k);
188 if (ik->should_be_initialized()) {
189 ik->initialize(CHECK_NULL);
190 }
191 // If these classes change to not be owned by the boot loader, they need
192 // to be walked to keep their class loader alive in oops_do.
193 assert(ik->class_loader() == NULL, "need to follow in oops_do");
194 return ik;
195 }
196
197 void Management::record_vm_startup_time(jlong begin, jlong duration) {
198 // if the performance counter is not initialized,
199 // then vm initialization failed; simply return.
200 if (_begin_vm_creation_time == NULL) return;
201
202 _begin_vm_creation_time->set_value(begin);
203 _end_vm_creation_time->set_value(begin + duration);
204 PerfMemory::set_accessible(true);
205 }
206
207 jlong Management::timestamp() {
208 TimeStamp t;
209 t.update();
210 return t.ticks() - _stamp.ticks();
211 }
212
213 void Management::oops_do(OopClosure* f) {
214 MemoryService::oops_do(f);
215 ThreadService::oops_do(f);
216 }
217
218 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
219 if (_threadInfo_klass == NULL) {
220 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
221 }
222 return _threadInfo_klass;
223 }
224
225 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
226 if (_memoryUsage_klass == NULL) {
227 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
228 }
229 return _memoryUsage_klass;
230 }
231
232 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
233 if (_memoryPoolMXBean_klass == NULL) {
234 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
235 }
236 return _memoryPoolMXBean_klass;
237 }
238
239 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
240 if (_memoryManagerMXBean_klass == NULL) {
241 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
242 }
243 return _memoryManagerMXBean_klass;
244 }
245
246 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
247 if (_garbageCollectorMXBean_klass == NULL) {
248 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
249 }
250 return _garbageCollectorMXBean_klass;
251 }
252
253 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
254 if (_sensor_klass == NULL) {
255 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
256 }
257 return _sensor_klass;
258 }
259
260 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
261 if (_managementFactoryHelper_klass == NULL) {
262 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
263 }
264 return _managementFactoryHelper_klass;
265 }
266
267 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
268 if (_garbageCollectorExtImpl_klass == NULL) {
269 _garbageCollectorExtImpl_klass =
270 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
271 }
272 return _garbageCollectorExtImpl_klass;
273 }
274
275 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
276 if (_gcInfo_klass == NULL) {
277 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
278 }
279 return _gcInfo_klass;
280 }
281
282 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
283 if (_diagnosticCommandImpl_klass == NULL) {
284 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
285 }
286 return _diagnosticCommandImpl_klass;
287 }
288
289 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
290 Handle snapshot_thread(THREAD, snapshot->threadObj());
291
292 jlong contended_time;
293 jlong waited_time;
294 if (ThreadService::is_thread_monitoring_contention()) {
295 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
296 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
297 } else {
298 // set them to -1 if thread contention monitoring is disabled.
299 contended_time = max_julong;
300 waited_time = max_julong;
301 }
302
303 int thread_status = snapshot->thread_status();
304 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
305 if (snapshot->is_ext_suspended()) {
306 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
307 }
308 if (snapshot->is_in_native()) {
309 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
310 }
311
312 ThreadStackTrace* st = snapshot->get_stack_trace();
313 Handle stacktrace_h;
314 if (st != NULL) {
315 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
316 } else {
317 stacktrace_h = Handle();
318 }
319
320 args->push_oop(snapshot_thread);
321 args->push_int(thread_status);
322 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
323 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
324 args->push_long(snapshot->contended_enter_count());
325 args->push_long(contended_time);
326 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
327 args->push_long(waited_time);
328 args->push_oop(stacktrace_h);
329 }
330
331 // Helper function to construct a ThreadInfo object
332 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
333 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
334
335 JavaValue result(T_VOID);
336 JavaCallArguments args(14);
337
338 // First allocate a ThreadObj object and
339 // push the receiver as the first argument
340 Handle element = ik->allocate_instance_handle(CHECK_NULL);
341 args.push_oop(element);
342
343 // initialize the arguments for the ThreadInfo constructor
344 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
345
346 // Call ThreadInfo constructor with no locked monitors and synchronizers
347 JavaCalls::call_special(&result,
348 ik,
349 vmSymbols::object_initializer_name(),
350 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
351 &args,
352 CHECK_NULL);
353
354 return (instanceOop) element();
355 }
356
357 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
358 objArrayHandle monitors_array,
359 typeArrayHandle depths_array,
360 objArrayHandle synchronizers_array,
361 TRAPS) {
362 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
363
364 JavaValue result(T_VOID);
365 JavaCallArguments args(17);
366
367 // First allocate a ThreadObj object and
368 // push the receiver as the first argument
369 Handle element = ik->allocate_instance_handle(CHECK_NULL);
370 args.push_oop(element);
371
372 // initialize the arguments for the ThreadInfo constructor
373 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
374
375 // push the locked monitors and synchronizers in the arguments
376 args.push_oop(monitors_array);
377 args.push_oop(depths_array);
378 args.push_oop(synchronizers_array);
379
380 // Call ThreadInfo constructor with locked monitors and synchronizers
381 JavaCalls::call_special(&result,
382 ik,
383 vmSymbols::object_initializer_name(),
384 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
385 &args,
386 CHECK_NULL);
387
388 return (instanceOop) element();
389 }
390
391
392 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
393 if (mgr == NULL) {
394 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
395 }
396 oop mgr_obj = JNIHandles::resolve(mgr);
397 instanceHandle h(THREAD, (instanceOop) mgr_obj);
398
399 InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
400 if (!h->is_a(k)) {
401 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
402 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
403 NULL);
404 }
405
406 MemoryManager* gc = MemoryService::get_memory_manager(h);
407 if (gc == NULL || !gc->is_gc_memory_manager()) {
408 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
409 "Invalid GC memory manager",
410 NULL);
411 }
412 return (GCMemoryManager*) gc;
413 }
414
415 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
416 if (obj == NULL) {
417 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
418 }
419
420 oop pool_obj = JNIHandles::resolve(obj);
421 assert(pool_obj->is_instance(), "Should be an instanceOop");
422 instanceHandle ph(THREAD, (instanceOop) pool_obj);
423
424 return MemoryService::get_memory_pool(ph);
425 }
426
427 #endif // INCLUDE_MANAGEMENT
428
429 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
430 int num_threads = ids_ah->length();
431
432 // Validate input thread IDs
433 int i = 0;
434 for (i = 0; i < num_threads; i++) {
435 jlong tid = ids_ah->long_at(i);
436 if (tid <= 0) {
437 // throw exception if invalid thread id.
438 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
439 "Invalid thread ID entry");
440 }
441 }
442 }
443
444 #if INCLUDE_MANAGEMENT
445
446 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
447 // check if the element of infoArray is of type ThreadInfo class
448 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
449 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
450 if (element_klass != threadinfo_klass) {
451 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
452 "infoArray element type is not ThreadInfo class");
453 }
454 }
455
456
457 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
458 if (obj == NULL) {
459 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
460 }
461
462 oop mgr_obj = JNIHandles::resolve(obj);
463 assert(mgr_obj->is_instance(), "Should be an instanceOop");
464 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
465
466 return MemoryService::get_memory_manager(mh);
467 }
468
469 // Returns a version string and sets major and minor version if
470 // the input parameters are non-null.
471 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
472 return JMM_VERSION;
473 JVM_END
474
475 // Gets the list of VM monitoring and management optional supports
476 // Returns 0 if succeeded; otherwise returns non-zero.
477 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
478 if (support == NULL) {
479 return -1;
480 }
481 Management::get_optional_support(support);
482 return 0;
483 JVM_END
484
485 // Returns an array of java/lang/management/MemoryPoolMXBean object
486 // one for each memory pool if obj == null; otherwise returns
487 // an array of memory pools for a given memory manager if
488 // it is a valid memory manager.
489 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
490 ResourceMark rm(THREAD);
491
492 int num_memory_pools;
493 MemoryManager* mgr = NULL;
494 if (obj == NULL) {
495 num_memory_pools = MemoryService::num_memory_pools();
496 } else {
497 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
498 if (mgr == NULL) {
499 return NULL;
500 }
501 num_memory_pools = mgr->num_memory_pools();
502 }
503
504 // Allocate the resulting MemoryPoolMXBean[] object
505 InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
506 objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
507 objArrayHandle poolArray(THREAD, r);
508
509 if (mgr == NULL) {
510 // Get all memory pools
511 for (int i = 0; i < num_memory_pools; i++) {
512 MemoryPool* pool = MemoryService::get_memory_pool(i);
513 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
514 instanceHandle ph(THREAD, p);
515 poolArray->obj_at_put(i, ph());
516 }
517 } else {
518 // Get memory pools managed by a given memory manager
519 for (int i = 0; i < num_memory_pools; i++) {
520 MemoryPool* pool = mgr->get_memory_pool(i);
521 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
522 instanceHandle ph(THREAD, p);
523 poolArray->obj_at_put(i, ph());
524 }
525 }
526 return (jobjectArray) JNIHandles::make_local(env, poolArray());
527 JVM_END
528
529 // Returns an array of java/lang/management/MemoryManagerMXBean object
530 // one for each memory manager if obj == null; otherwise returns
531 // an array of memory managers for a given memory pool if
532 // it is a valid memory pool.
533 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
534 ResourceMark rm(THREAD);
535
536 int num_mgrs;
537 MemoryPool* pool = NULL;
538 if (obj == NULL) {
539 num_mgrs = MemoryService::num_memory_managers();
540 } else {
541 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
542 if (pool == NULL) {
543 return NULL;
544 }
545 num_mgrs = pool->num_memory_managers();
546 }
547
548 // Allocate the resulting MemoryManagerMXBean[] object
549 InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
550 objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
551 objArrayHandle mgrArray(THREAD, r);
552
553 if (pool == NULL) {
554 // Get all memory managers
555 for (int i = 0; i < num_mgrs; i++) {
556 MemoryManager* mgr = MemoryService::get_memory_manager(i);
557 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
558 instanceHandle ph(THREAD, p);
559 mgrArray->obj_at_put(i, ph());
560 }
561 } else {
562 // Get memory managers for a given memory pool
563 for (int i = 0; i < num_mgrs; i++) {
564 MemoryManager* mgr = pool->get_memory_manager(i);
565 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
566 instanceHandle ph(THREAD, p);
567 mgrArray->obj_at_put(i, ph());
568 }
569 }
570 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
571 JVM_END
572
573
574 // Returns a java/lang/management/MemoryUsage object containing the memory usage
575 // of a given memory pool.
576 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
577 ResourceMark rm(THREAD);
578
579 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
580 if (pool != NULL) {
581 MemoryUsage usage = pool->get_memory_usage();
582 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
583 return JNIHandles::make_local(env, h());
584 } else {
585 return NULL;
586 }
587 JVM_END
588
589 // Returns a java/lang/management/MemoryUsage object containing the memory usage
590 // of a given memory pool.
591 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
592 ResourceMark rm(THREAD);
593
594 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
595 if (pool != NULL) {
596 MemoryUsage usage = pool->get_peak_memory_usage();
597 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
598 return JNIHandles::make_local(env, h());
599 } else {
600 return NULL;
601 }
602 JVM_END
603
604 // Returns a java/lang/management/MemoryUsage object containing the memory usage
605 // of a given memory pool after most recent GC.
606 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
607 ResourceMark rm(THREAD);
608
609 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
610 if (pool != NULL && pool->is_collected_pool()) {
611 MemoryUsage usage = pool->get_last_collection_usage();
612 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
613 return JNIHandles::make_local(env, h());
614 } else {
615 return NULL;
616 }
617 JVM_END
618
619 // Sets the memory pool sensor for a threshold type
620 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
621 if (obj == NULL || sensorObj == NULL) {
622 THROW(vmSymbols::java_lang_NullPointerException());
623 }
624
625 InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
626 oop s = JNIHandles::resolve(sensorObj);
627 assert(s->is_instance(), "Sensor should be an instanceOop");
628 instanceHandle sensor_h(THREAD, (instanceOop) s);
629 if (!sensor_h->is_a(sensor_klass)) {
630 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
631 "Sensor is not an instance of sun.management.Sensor class");
632 }
633
634 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
635 assert(mpool != NULL, "MemoryPool should exist");
636
637 switch (type) {
638 case JMM_USAGE_THRESHOLD_HIGH:
639 case JMM_USAGE_THRESHOLD_LOW:
640 // have only one sensor for threshold high and low
641 mpool->set_usage_sensor_obj(sensor_h);
642 break;
643 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
644 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
645 // have only one sensor for threshold high and low
646 mpool->set_gc_usage_sensor_obj(sensor_h);
647 break;
648 default:
649 assert(false, "Unrecognized type");
650 }
651
652 JVM_END
653
654
655 // Sets the threshold of a given memory pool.
656 // Returns the previous threshold.
657 //
658 // Input parameters:
659 // pool - the MemoryPoolMXBean object
660 // type - threshold type
661 // threshold - the new threshold (must not be negative)
662 //
663 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
664 if (threshold < 0) {
665 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
666 "Invalid threshold value",
667 -1);
668 }
669
670 if ((size_t)threshold > max_uintx) {
671 stringStream st;
672 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
673 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
674 }
675
676 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
677 assert(pool != NULL, "MemoryPool should exist");
678
679 jlong prev = 0;
680 switch (type) {
681 case JMM_USAGE_THRESHOLD_HIGH:
682 if (!pool->usage_threshold()->is_high_threshold_supported()) {
683 return -1;
684 }
685 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
686 break;
687
688 case JMM_USAGE_THRESHOLD_LOW:
689 if (!pool->usage_threshold()->is_low_threshold_supported()) {
690 return -1;
691 }
692 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
693 break;
694
695 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
696 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
697 return -1;
698 }
699 // return and the new threshold is effective for the next GC
700 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
701
702 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
703 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
704 return -1;
705 }
706 // return and the new threshold is effective for the next GC
707 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
708
709 default:
710 assert(false, "Unrecognized type");
711 return -1;
712 }
713
714 // When the threshold is changed, reevaluate if the low memory
715 // detection is enabled.
716 if (prev != threshold) {
717 LowMemoryDetector::recompute_enabled_for_collected_pools();
718 LowMemoryDetector::detect_low_memory(pool);
719 }
720 return prev;
721 JVM_END
722
723 // Returns a java/lang/management/MemoryUsage object representing
724 // the memory usage for the heap or non-heap memory.
725 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
726 ResourceMark rm(THREAD);
727
728 // Calculate the memory usage
729 size_t total_init = 0;
730 size_t total_used = 0;
731 size_t total_committed = 0;
732 size_t total_max = 0;
733 bool has_undefined_init_size = false;
734 bool has_undefined_max_size = false;
735
736 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
737 MemoryPool* pool = MemoryService::get_memory_pool(i);
738 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
739 MemoryUsage u = pool->get_memory_usage();
740 total_used += u.used();
741 total_committed += u.committed();
742
743 if (u.init_size() == (size_t)-1) {
744 has_undefined_init_size = true;
745 }
746 if (!has_undefined_init_size) {
747 total_init += u.init_size();
748 }
749
750 if (u.max_size() == (size_t)-1) {
751 has_undefined_max_size = true;
752 }
753 if (!has_undefined_max_size) {
754 total_max += u.max_size();
755 }
756 }
757 }
758
759 // if any one of the memory pool has undefined init_size or max_size,
760 // set it to -1
761 if (has_undefined_init_size) {
762 total_init = (size_t)-1;
763 }
764 if (has_undefined_max_size) {
765 total_max = (size_t)-1;
766 }
767
768 MemoryUsage usage((heap ? InitialHeapSize : total_init),
769 total_used,
770 total_committed,
771 (heap ? GC::gc()->heap()->max_capacity() : total_max));
772
773 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
774 return JNIHandles::make_local(env, obj());
775 JVM_END
776
777 // Returns the boolean value of a given attribute.
778 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
779 switch (att) {
780 case JMM_VERBOSE_GC:
781 return MemoryService::get_verbose();
782 case JMM_VERBOSE_CLASS:
783 return ClassLoadingService::get_verbose();
784 case JMM_THREAD_CONTENTION_MONITORING:
785 return ThreadService::is_thread_monitoring_contention();
786 case JMM_THREAD_CPU_TIME:
787 return ThreadService::is_thread_cpu_time_enabled();
788 case JMM_THREAD_ALLOCATED_MEMORY:
789 return ThreadService::is_thread_allocated_memory_enabled();
790 default:
791 assert(0, "Unrecognized attribute");
792 return false;
793 }
794 JVM_END
795
796 // Sets the given boolean attribute and returns the previous value.
797 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
798 switch (att) {
799 case JMM_VERBOSE_GC:
800 return MemoryService::set_verbose(flag != 0);
801 case JMM_VERBOSE_CLASS:
802 return ClassLoadingService::set_verbose(flag != 0);
803 case JMM_THREAD_CONTENTION_MONITORING:
804 return ThreadService::set_thread_monitoring_contention(flag != 0);
805 case JMM_THREAD_CPU_TIME:
806 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
807 case JMM_THREAD_ALLOCATED_MEMORY:
808 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
809 default:
810 assert(0, "Unrecognized attribute");
811 return false;
812 }
813 JVM_END
814
815
816 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
817 switch (att) {
818 case JMM_GC_TIME_MS:
819 return mgr->gc_time_ms();
820
821 case JMM_GC_COUNT:
822 return mgr->gc_count();
823
824 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
825 // current implementation only has 1 ext attribute
826 return 1;
827
828 default:
829 assert(0, "Unrecognized GC attribute");
830 return -1;
831 }
832 }
833
834 class VmThreadCountClosure: public ThreadClosure {
835 private:
836 int _count;
837 public:
838 VmThreadCountClosure() : _count(0) {};
839 void do_thread(Thread* thread);
840 int count() { return _count; }
841 };
842
843 void VmThreadCountClosure::do_thread(Thread* thread) {
844 // exclude externally visible JavaThreads
845 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
846 return;
847 }
848
849 _count++;
850 }
851
852 static jint get_vm_thread_count() {
853 VmThreadCountClosure vmtcc;
854 {
855 MutexLockerEx ml(Threads_lock);
856 Threads::threads_do(&vmtcc);
857 }
858
859 return vmtcc.count();
860 }
861
862 static jint get_num_flags() {
863 // last flag entry is always NULL, so subtract 1
864 int nFlags = (int) Flag::numFlags - 1;
865 int count = 0;
866 for (int i = 0; i < nFlags; i++) {
867 Flag* flag = &Flag::flags[i];
868 // Exclude the locked (diagnostic, experimental) flags
869 if (flag->is_unlocked() || flag->is_unlocker()) {
870 count++;
871 }
872 }
873 return count;
874 }
875
876 static jlong get_long_attribute(jmmLongAttribute att) {
877 switch (att) {
878 case JMM_CLASS_LOADED_COUNT:
879 return ClassLoadingService::loaded_class_count();
880
881 case JMM_CLASS_UNLOADED_COUNT:
882 return ClassLoadingService::unloaded_class_count();
883
884 case JMM_THREAD_TOTAL_COUNT:
885 return ThreadService::get_total_thread_count();
886
887 case JMM_THREAD_LIVE_COUNT:
888 return ThreadService::get_live_thread_count();
889
890 case JMM_THREAD_PEAK_COUNT:
891 return ThreadService::get_peak_thread_count();
892
893 case JMM_THREAD_DAEMON_COUNT:
894 return ThreadService::get_daemon_thread_count();
895
896 case JMM_JVM_INIT_DONE_TIME_MS:
897 return Management::vm_init_done_time();
898
899 case JMM_JVM_UPTIME_MS:
900 return Management::ticks_to_ms(os::elapsed_counter());
901
902 case JMM_COMPILE_TOTAL_TIME_MS:
903 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
904
905 case JMM_OS_PROCESS_ID:
906 return os::current_process_id();
907
908 // Hotspot-specific counters
909 case JMM_CLASS_LOADED_BYTES:
910 return ClassLoadingService::loaded_class_bytes();
911
912 case JMM_CLASS_UNLOADED_BYTES:
913 return ClassLoadingService::unloaded_class_bytes();
914
915 case JMM_SHARED_CLASS_LOADED_COUNT:
916 return ClassLoadingService::loaded_shared_class_count();
917
918 case JMM_SHARED_CLASS_UNLOADED_COUNT:
919 return ClassLoadingService::unloaded_shared_class_count();
920
921
922 case JMM_SHARED_CLASS_LOADED_BYTES:
923 return ClassLoadingService::loaded_shared_class_bytes();
924
925 case JMM_SHARED_CLASS_UNLOADED_BYTES:
926 return ClassLoadingService::unloaded_shared_class_bytes();
927
928 case JMM_TOTAL_CLASSLOAD_TIME_MS:
929 return ClassLoader::classloader_time_ms();
930
931 case JMM_VM_GLOBAL_COUNT:
932 return get_num_flags();
933
934 case JMM_SAFEPOINT_COUNT:
935 return RuntimeService::safepoint_count();
936
937 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
938 return RuntimeService::safepoint_sync_time_ms();
939
940 case JMM_TOTAL_STOPPED_TIME_MS:
941 return RuntimeService::safepoint_time_ms();
942
943 case JMM_TOTAL_APP_TIME_MS:
944 return RuntimeService::application_time_ms();
945
946 case JMM_VM_THREAD_COUNT:
947 return get_vm_thread_count();
948
949 case JMM_CLASS_INIT_TOTAL_COUNT:
950 return ClassLoader::class_init_count();
951
952 case JMM_CLASS_INIT_TOTAL_TIME_MS:
953 return ClassLoader::class_init_time_ms();
954
955 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
956 return ClassLoader::class_verify_time_ms();
957
958 case JMM_METHOD_DATA_SIZE_BYTES:
959 return ClassLoadingService::class_method_data_size();
960
961 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
962 return os::physical_memory();
963
964 default:
965 return -1;
966 }
967 }
968
969
970 // Returns the long value of a given attribute.
971 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
972 if (obj == NULL) {
973 return get_long_attribute(att);
974 } else {
975 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
976 if (mgr != NULL) {
977 return get_gc_attribute(mgr, att);
978 }
979 }
980 return -1;
981 JVM_END
982
983 // Gets the value of all attributes specified in the given array
984 // and sets the value in the result array.
985 // Returns the number of attributes found.
986 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
987 jobject obj,
988 jmmLongAttribute* atts,
989 jint count,
990 jlong* result))
991
992 int num_atts = 0;
993 if (obj == NULL) {
994 for (int i = 0; i < count; i++) {
995 result[i] = get_long_attribute(atts[i]);
996 if (result[i] != -1) {
997 num_atts++;
998 }
999 }
1000 } else {
1001 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1002 for (int i = 0; i < count; i++) {
1003 result[i] = get_gc_attribute(mgr, atts[i]);
1004 if (result[i] != -1) {
1005 num_atts++;
1006 }
1007 }
1008 }
1009 return num_atts;
1010 JVM_END
1011
1012 // Helper function to do thread dump for a specific list of threads
1013 static void do_thread_dump(ThreadDumpResult* dump_result,
1014 typeArrayHandle ids_ah, // array of thread ID (long[])
1015 int num_threads,
1016 int max_depth,
1017 bool with_locked_monitors,
1018 bool with_locked_synchronizers,
1019 TRAPS) {
1020 // no need to actually perform thread dump if no TIDs are specified
1021 if (num_threads == 0) return;
1022
1023 // First get an array of threadObj handles.
1024 // A JavaThread may terminate before we get the stack trace.
1025 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1026 {
1027 MutexLockerEx ml(Threads_lock);
1028 for (int i = 0; i < num_threads; i++) {
1029 jlong tid = ids_ah->long_at(i);
1030 JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1031 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1032 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1033 thread_handle_array->append(threadObj_h);
1034 }
1035 }
1036
1037 // Obtain thread dumps and thread snapshot information
1038 VM_ThreadDump op(dump_result,
1039 thread_handle_array,
1040 num_threads,
1041 max_depth, /* stack depth */
1042 with_locked_monitors,
1043 with_locked_synchronizers);
1044 VMThread::execute(&op);
1045 }
1046
1047 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1048 // for the thread ID specified in the corresponding entry in
1049 // the given array of thread IDs; or NULL if the thread does not exist
1050 // or has terminated.
1051 //
1052 // Input parameters:
1053 // ids - array of thread IDs
1054 // maxDepth - the maximum depth of stack traces to be dumped:
1055 // maxDepth == -1 requests to dump entire stack trace.
1056 // maxDepth == 0 requests no stack trace.
1057 // infoArray - array of ThreadInfo objects
1058 //
1059 // QQQ - Why does this method return a value instead of void?
1060 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1061 // Check if threads is null
1062 if (ids == NULL || infoArray == NULL) {
1063 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1064 }
1065
1066 if (maxDepth < -1) {
1067 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1068 "Invalid maxDepth", -1);
1069 }
1070
1071 ResourceMark rm(THREAD);
1072 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1073 typeArrayHandle ids_ah(THREAD, ta);
1074
1075 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1076 objArrayOop oa = objArrayOop(infoArray_obj);
1077 objArrayHandle infoArray_h(THREAD, oa);
1078
1079 // validate the thread id array
1080 validate_thread_id_array(ids_ah, CHECK_0);
1081
1082 // validate the ThreadInfo[] parameters
1083 validate_thread_info_array(infoArray_h, CHECK_0);
1084
1085 // infoArray must be of the same length as the given array of thread IDs
1086 int num_threads = ids_ah->length();
1087 if (num_threads != infoArray_h->length()) {
1088 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1089 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1090 }
1091
1092 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1093 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1094
1095 // Must use ThreadDumpResult to store the ThreadSnapshot.
1096 // GC may occur after the thread snapshots are taken but before
1097 // this function returns. The threadObj and other oops kept
1098 // in the ThreadSnapshot are marked and adjusted during GC.
1099 ThreadDumpResult dump_result(num_threads);
1100
1101 if (maxDepth == 0) {
1102 // no stack trace dumped - do not need to stop the world
1103 {
1104 MutexLockerEx ml(Threads_lock);
1105 for (int i = 0; i < num_threads; i++) {
1106 jlong tid = ids_ah->long_at(i);
1107 JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1108 ThreadSnapshot* ts;
1109 if (jt == NULL) {
1110 // if the thread does not exist or now it is terminated,
1111 // create dummy snapshot
1112 ts = new ThreadSnapshot();
1113 } else {
1114 ts = new ThreadSnapshot(jt);
1115 }
1116 dump_result.add_thread_snapshot(ts);
1117 }
1118 }
1119 } else {
1120 // obtain thread dump with the specific list of threads with stack trace
1121 do_thread_dump(&dump_result,
1122 ids_ah,
1123 num_threads,
1124 maxDepth,
1125 false, /* no locked monitor */
1126 false, /* no locked synchronizers */
1127 CHECK_0);
1128 }
1129
1130 int num_snapshots = dump_result.num_snapshots();
1131 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1132 int index = 0;
1133 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1134 // For each thread, create an java/lang/management/ThreadInfo object
1135 // and fill with the thread information
1136
1137 if (ts->threadObj() == NULL) {
1138 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1139 infoArray_h->obj_at_put(index, NULL);
1140 continue;
1141 }
1142
1143 // Create java.lang.management.ThreadInfo object
1144 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1145 infoArray_h->obj_at_put(index, info_obj);
1146 }
1147 return 0;
1148 JVM_END
1149
1150 // Dump thread info for the specified threads.
1151 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1152 // for the thread ID specified in the corresponding entry in
1153 // the given array of thread IDs; or NULL if the thread does not exist
1154 // or has terminated.
1155 //
1156 // Input parameter:
1157 // ids - array of thread IDs; NULL indicates all live threads
1158 // locked_monitors - if true, dump locked object monitors
1159 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1160 //
1161 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1162 ResourceMark rm(THREAD);
1163
1164 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1165 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1166
1167 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1168 int num_threads = (ta != NULL ? ta->length() : 0);
1169 typeArrayHandle ids_ah(THREAD, ta);
1170
1171 ThreadDumpResult dump_result(num_threads); // can safepoint
1172
1173 if (ids_ah() != NULL) {
1174
1175 // validate the thread id array
1176 validate_thread_id_array(ids_ah, CHECK_NULL);
1177
1178 // obtain thread dump of a specific list of threads
1179 do_thread_dump(&dump_result,
1180 ids_ah,
1181 num_threads,
1182 -1, /* entire stack */
1183 (locked_monitors ? true : false), /* with locked monitors */
1184 (locked_synchronizers ? true : false), /* with locked synchronizers */
1185 CHECK_NULL);
1186 } else {
1187 // obtain thread dump of all threads
1188 VM_ThreadDump op(&dump_result,
1189 -1, /* entire stack */
1190 (locked_monitors ? true : false), /* with locked monitors */
1191 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1192 VMThread::execute(&op);
1193 }
1194
1195 int num_snapshots = dump_result.num_snapshots();
1196
1197 // create the result ThreadInfo[] object
1198 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1199 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1200 objArrayHandle result_h(THREAD, r);
1201
1202 int index = 0;
1203 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1204 if (ts->threadObj() == NULL) {
1205 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1206 result_h->obj_at_put(index, NULL);
1207 continue;
1208 }
1209
1210 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1211 assert(stacktrace != NULL, "Must have a stack trace dumped");
1212
1213 // Create Object[] filled with locked monitors
1214 // Create int[] filled with the stack depth where a monitor was locked
1215 int num_frames = stacktrace->get_stack_depth();
1216 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1217
1218 // Count the total number of locked monitors
1219 for (int i = 0; i < num_frames; i++) {
1220 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1221 num_locked_monitors += frame->num_locked_monitors();
1222 }
1223
1224 objArrayHandle monitors_array;
1225 typeArrayHandle depths_array;
1226 objArrayHandle synchronizers_array;
1227
1228 if (locked_monitors) {
1229 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1230 // where the thread locked it
1231 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1232 objArrayHandle mh(THREAD, array);
1233 monitors_array = mh;
1234
1235 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1236 typeArrayHandle dh(THREAD, tarray);
1237 depths_array = dh;
1238
1239 int count = 0;
1240 int j = 0;
1241 for (int depth = 0; depth < num_frames; depth++) {
1242 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1243 int len = frame->num_locked_monitors();
1244 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1245 for (j = 0; j < len; j++) {
1246 oop monitor = locked_monitors->at(j);
1247 assert(monitor != NULL, "must be a Java object");
1248 monitors_array->obj_at_put(count, monitor);
1249 depths_array->int_at_put(count, depth);
1250 count++;
1251 }
1252 }
1253
1254 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1255 for (j = 0; j < jni_locked_monitors->length(); j++) {
1256 oop object = jni_locked_monitors->at(j);
1257 assert(object != NULL, "must be a Java object");
1258 monitors_array->obj_at_put(count, object);
1259 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1260 depths_array->int_at_put(count, -1);
1261 count++;
1262 }
1263 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1264 }
1265
1266 if (locked_synchronizers) {
1267 // Create Object[] filled with locked JSR-166 synchronizers
1268 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1269 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1270 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1271 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1272
1273 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1274 objArrayHandle sh(THREAD, array);
1275 synchronizers_array = sh;
1276
1277 for (int k = 0; k < num_locked_synchronizers; k++) {
1278 synchronizers_array->obj_at_put(k, locks->at(k));
1279 }
1280 }
1281
1282 // Create java.lang.management.ThreadInfo object
1283 instanceOop info_obj = Management::create_thread_info_instance(ts,
1284 monitors_array,
1285 depths_array,
1286 synchronizers_array,
1287 CHECK_NULL);
1288 result_h->obj_at_put(index, info_obj);
1289 }
1290
1291 return (jobjectArray) JNIHandles::make_local(env, result_h());
1292 JVM_END
1293
1294 // Reset statistic. Return true if the requested statistic is reset.
1295 // Otherwise, return false.
1296 //
1297 // Input parameters:
1298 // obj - specify which instance the statistic associated with to be reset
1299 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1300 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1301 // type - the type of statistic to be reset
1302 //
1303 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1304 ResourceMark rm(THREAD);
1305
1306 switch (type) {
1307 case JMM_STAT_PEAK_THREAD_COUNT:
1308 ThreadService::reset_peak_thread_count();
1309 return true;
1310
1311 case JMM_STAT_THREAD_CONTENTION_COUNT:
1312 case JMM_STAT_THREAD_CONTENTION_TIME: {
1313 jlong tid = obj.j;
1314 if (tid < 0) {
1315 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1316 }
1317
1318 // Look for the JavaThread of this given tid
1319 MutexLockerEx ml(Threads_lock);
1320 if (tid == 0) {
1321 // reset contention statistics for all threads if tid == 0
1322 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1323 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1324 ThreadService::reset_contention_count_stat(java_thread);
1325 } else {
1326 ThreadService::reset_contention_time_stat(java_thread);
1327 }
1328 }
1329 } else {
1330 // reset contention statistics for a given thread
1331 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(tid);
1332 if (java_thread == NULL) {
1333 return false;
1334 }
1335
1336 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1337 ThreadService::reset_contention_count_stat(java_thread);
1338 } else {
1339 ThreadService::reset_contention_time_stat(java_thread);
1340 }
1341 }
1342 return true;
1343 break;
1344 }
1345 case JMM_STAT_PEAK_POOL_USAGE: {
1346 jobject o = obj.l;
1347 if (o == NULL) {
1348 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1349 }
1350
1351 oop pool_obj = JNIHandles::resolve(o);
1352 assert(pool_obj->is_instance(), "Should be an instanceOop");
1353 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1354
1355 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1356 if (pool != NULL) {
1357 pool->reset_peak_memory_usage();
1358 return true;
1359 }
1360 break;
1361 }
1362 case JMM_STAT_GC_STAT: {
1363 jobject o = obj.l;
1364 if (o == NULL) {
1365 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1366 }
1367
1368 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1369 if (mgr != NULL) {
1370 mgr->reset_gc_stat();
1371 return true;
1372 }
1373 break;
1374 }
1375 default:
1376 assert(0, "Unknown Statistic Type");
1377 }
1378 return false;
1379 JVM_END
1380
1381 // Returns the fast estimate of CPU time consumed by
1382 // a given thread (in nanoseconds).
1383 // If thread_id == 0, return CPU time for the current thread.
1384 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1385 if (!os::is_thread_cpu_time_supported()) {
1386 return -1;
1387 }
1388
1389 if (thread_id < 0) {
1390 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1391 "Invalid thread ID", -1);
1392 }
1393
1394 JavaThread* java_thread = NULL;
1395 if (thread_id == 0) {
1396 // current thread
1397 return os::current_thread_cpu_time();
1398 } else {
1399 MutexLockerEx ml(Threads_lock);
1400 java_thread = Threads::find_java_thread_from_java_tid(thread_id);
1401 if (java_thread != NULL) {
1402 return os::thread_cpu_time((Thread*) java_thread);
1403 }
1404 }
1405 return -1;
1406 JVM_END
1407
1408 // Returns a String array of all VM global flag names
1409 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1410 // last flag entry is always NULL, so subtract 1
1411 int nFlags = (int) Flag::numFlags - 1;
1412 // allocate a temp array
1413 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1414 nFlags, CHECK_0);
1415 objArrayHandle flags_ah(THREAD, r);
1416 int num_entries = 0;
1417 for (int i = 0; i < nFlags; i++) {
1418 Flag* flag = &Flag::flags[i];
1419 // Exclude notproduct and develop flags in product builds.
1420 if (flag->is_constant_in_binary()) {
1421 continue;
1422 }
1423 // Exclude the locked (experimental, diagnostic) flags
1424 if (flag->is_unlocked() || flag->is_unlocker()) {
1425 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1426 flags_ah->obj_at_put(num_entries, s());
1427 num_entries++;
1428 }
1429 }
1430
1431 if (num_entries < nFlags) {
1432 // Return array of right length
1433 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1434 for(int i = 0; i < num_entries; i++) {
1435 res->obj_at_put(i, flags_ah->obj_at(i));
1436 }
1437 return (jobjectArray)JNIHandles::make_local(env, res);
1438 }
1439
1440 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1441 JVM_END
1442
1443 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1444 // can't be determined, true otherwise. If false is returned, then *global
1445 // will be incomplete and invalid.
1446 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1447 Handle flag_name;
1448 if (name() == NULL) {
1449 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1450 } else {
1451 flag_name = name;
1452 }
1453 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1454
1455 if (flag->is_bool()) {
1456 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1457 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1458 } else if (flag->is_int()) {
1459 global->value.j = (jlong)flag->get_int();
1460 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1461 } else if (flag->is_uint()) {
1462 global->value.j = (jlong)flag->get_uint();
1463 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1464 } else if (flag->is_intx()) {
1465 global->value.j = (jlong)flag->get_intx();
1466 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1467 } else if (flag->is_uintx()) {
1468 global->value.j = (jlong)flag->get_uintx();
1469 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1470 } else if (flag->is_uint64_t()) {
1471 global->value.j = (jlong)flag->get_uint64_t();
1472 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1473 } else if (flag->is_double()) {
1474 global->value.d = (jdouble)flag->get_double();
1475 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1476 } else if (flag->is_size_t()) {
1477 global->value.j = (jlong)flag->get_size_t();
1478 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1479 } else if (flag->is_ccstr()) {
1480 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1481 global->value.l = (jobject)JNIHandles::make_local(env, str());
1482 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1483 } else {
1484 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1485 return false;
1486 }
1487
1488 global->writeable = flag->is_writeable();
1489 global->external = flag->is_external();
1490 switch (flag->get_origin()) {
1491 case Flag::DEFAULT:
1492 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1493 break;
1494 case Flag::COMMAND_LINE:
1495 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1496 break;
1497 case Flag::ENVIRON_VAR:
1498 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1499 break;
1500 case Flag::CONFIG_FILE:
1501 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1502 break;
1503 case Flag::MANAGEMENT:
1504 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1505 break;
1506 case Flag::ERGONOMIC:
1507 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1508 break;
1509 case Flag::ATTACH_ON_DEMAND:
1510 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1511 break;
1512 default:
1513 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1514 }
1515
1516 return true;
1517 }
1518
1519 // Fill globals array of count length with jmmVMGlobal entries
1520 // specified by names. If names == NULL, fill globals array
1521 // with all Flags. Return value is number of entries
1522 // created in globals.
1523 // If a Flag with a given name in an array element does not
1524 // exist, globals[i].name will be set to NULL.
1525 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1526 jobjectArray names,
1527 jmmVMGlobal *globals,
1528 jint count))
1529
1530
1531 if (globals == NULL) {
1532 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1533 }
1534
1535 ResourceMark rm(THREAD);
1536
1537 if (names != NULL) {
1538 // return the requested globals
1539 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1540 objArrayHandle names_ah(THREAD, ta);
1541 // Make sure we have a String array
1542 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1543 if (element_klass != SystemDictionary::String_klass()) {
1544 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1545 "Array element type is not String class", 0);
1546 }
1547
1548 int names_length = names_ah->length();
1549 int num_entries = 0;
1550 for (int i = 0; i < names_length && i < count; i++) {
1551 oop s = names_ah->obj_at(i);
1552 if (s == NULL) {
1553 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1554 }
1555
1556 Handle sh(THREAD, s);
1557 char* str = java_lang_String::as_utf8_string(s);
1558 Flag* flag = Flag::find_flag(str, strlen(str));
1559 if (flag != NULL &&
1560 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1561 num_entries++;
1562 } else {
1563 globals[i].name = NULL;
1564 }
1565 }
1566 return num_entries;
1567 } else {
1568 // return all globals if names == NULL
1569
1570 // last flag entry is always NULL, so subtract 1
1571 int nFlags = (int) Flag::numFlags - 1;
1572 Handle null_h;
1573 int num_entries = 0;
1574 for (int i = 0; i < nFlags && num_entries < count; i++) {
1575 Flag* flag = &Flag::flags[i];
1576 // Exclude notproduct and develop flags in product builds.
1577 if (flag->is_constant_in_binary()) {
1578 continue;
1579 }
1580 // Exclude the locked (diagnostic, experimental) flags
1581 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1582 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1583 num_entries++;
1584 }
1585 }
1586 return num_entries;
1587 }
1588 JVM_END
1589
1590 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1591 ResourceMark rm(THREAD);
1592
1593 oop fn = JNIHandles::resolve_external_guard(flag_name);
1594 if (fn == NULL) {
1595 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1596 "The flag name cannot be null.");
1597 }
1598 char* name = java_lang_String::as_utf8_string(fn);
1599
1600 FormatBuffer<80> error_msg("%s", "");
1601 int succeed = WriteableFlags::set_flag(name, new_value, Flag::MANAGEMENT, error_msg);
1602
1603 if (succeed != Flag::SUCCESS) {
1604 if (succeed == Flag::MISSING_VALUE) {
1605 // missing value causes NPE to be thrown
1606 THROW(vmSymbols::java_lang_NullPointerException());
1607 } else {
1608 // all the other errors are reported as IAE with the appropriate error message
1609 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1610 error_msg.buffer());
1611 }
1612 }
1613 assert(succeed == Flag::SUCCESS, "Setting flag should succeed");
1614 JVM_END
1615
1616 class ThreadTimesClosure: public ThreadClosure {
1617 private:
1618 objArrayHandle _names_strings;
1619 char **_names_chars;
1620 typeArrayHandle _times;
1621 int _names_len;
1622 int _times_len;
1623 int _count;
1624
1625 public:
1626 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1627 ~ThreadTimesClosure();
1628 virtual void do_thread(Thread* thread);
1629 void do_unlocked();
1630 int count() { return _count; }
1631 };
1632
1633 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1634 typeArrayHandle times) {
1635 assert(names() != NULL, "names was NULL");
1636 assert(times() != NULL, "times was NULL");
1637 _names_strings = names;
1638 _names_len = names->length();
1639 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1640 _times = times;
1641 _times_len = times->length();
1642 _count = 0;
1643 }
1644
1645 //
1646 // Called with Threads_lock held
1647 //
1648 void ThreadTimesClosure::do_thread(Thread* thread) {
1649 assert(thread != NULL, "thread was NULL");
1650
1651 // exclude externally visible JavaThreads
1652 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1653 return;
1654 }
1655
1656 if (_count >= _names_len || _count >= _times_len) {
1657 // skip if the result array is not big enough
1658 return;
1659 }
1660
1661 EXCEPTION_MARK;
1662 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1663
1664 assert(thread->name() != NULL, "All threads should have a name");
1665 _names_chars[_count] = os::strdup(thread->name());
1666 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1667 os::thread_cpu_time(thread) : -1);
1668 _count++;
1669 }
1670
1671 // Called without Threads_lock, we can allocate String objects.
1672 void ThreadTimesClosure::do_unlocked() {
1673
1674 EXCEPTION_MARK;
1675 for (int i = 0; i < _count; i++) {
1676 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1677 _names_strings->obj_at_put(i, s());
1678 }
1679 }
1680
1681 ThreadTimesClosure::~ThreadTimesClosure() {
1682 for (int i = 0; i < _count; i++) {
1683 os::free(_names_chars[i]);
1684 }
1685 FREE_C_HEAP_ARRAY(char *, _names_chars);
1686 }
1687
1688 // Fills names with VM internal thread names and times with the corresponding
1689 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1690 // If the element type of names is not String, an IllegalArgumentException is
1691 // thrown.
1692 // If an array is not large enough to hold all the entries, only the entries
1693 // that fit will be returned. Return value is the number of VM internal
1694 // threads entries.
1695 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1696 jobjectArray names,
1697 jlongArray times))
1698 if (names == NULL || times == NULL) {
1699 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1700 }
1701 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1702 objArrayHandle names_ah(THREAD, na);
1703
1704 // Make sure we have a String array
1705 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1706 if (element_klass != SystemDictionary::String_klass()) {
1707 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1708 "Array element type is not String class", 0);
1709 }
1710
1711 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1712 typeArrayHandle times_ah(THREAD, ta);
1713
1714 ThreadTimesClosure ttc(names_ah, times_ah);
1715 {
1716 MutexLockerEx ml(Threads_lock);
1717 Threads::threads_do(&ttc);
1718 }
1719 ttc.do_unlocked();
1720 return ttc.count();
1721 JVM_END
1722
1723 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1724 ResourceMark rm(THREAD);
1725
1726 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1727 VMThread::execute(&op);
1728
1729 DeadlockCycle* deadlocks = op.result();
1730 if (deadlocks == NULL) {
1731 // no deadlock found and return
1732 return Handle();
1733 }
1734
1735 int num_threads = 0;
1736 DeadlockCycle* cycle;
1737 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1738 num_threads += cycle->num_threads();
1739 }
1740
1741 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1742 objArrayHandle threads_ah(THREAD, r);
1743
1744 int index = 0;
1745 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1746 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1747 int len = deadlock_threads->length();
1748 for (int i = 0; i < len; i++) {
1749 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1750 index++;
1751 }
1752 }
1753 return threads_ah;
1754 }
1755
1756 // Finds cycles of threads that are deadlocked involved in object monitors
1757 // and JSR-166 synchronizers.
1758 // Returns an array of Thread objects which are in deadlock, if any.
1759 // Otherwise, returns NULL.
1760 //
1761 // Input parameter:
1762 // object_monitors_only - if true, only check object monitors
1763 //
1764 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1765 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1766 return (jobjectArray) JNIHandles::make_local(env, result());
1767 JVM_END
1768
1769 // Finds cycles of threads that are deadlocked on monitor locks
1770 // Returns an array of Thread objects which are in deadlock, if any.
1771 // Otherwise, returns NULL.
1772 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1773 Handle result = find_deadlocks(true, CHECK_0);
1774 return (jobjectArray) JNIHandles::make_local(env, result());
1775 JVM_END
1776
1777 // Gets the information about GC extension attributes including
1778 // the name of the attribute, its type, and a short description.
1779 //
1780 // Input parameters:
1781 // mgr - GC memory manager
1782 // info - caller allocated array of jmmExtAttributeInfo
1783 // count - number of elements of the info array
1784 //
1785 // Returns the number of GC extension attributes filled in the info array; or
1786 // -1 if info is not big enough
1787 //
1788 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1789 // All GC memory managers have 1 attribute (number of GC threads)
1790 if (count == 0) {
1791 return 0;
1792 }
1793
1794 if (info == NULL) {
1795 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1796 }
1797
1798 info[0].name = "GcThreadCount";
1799 info[0].type = 'I';
1800 info[0].description = "Number of GC threads";
1801 return 1;
1802 JVM_END
1803
1804 // verify the given array is an array of java/lang/management/MemoryUsage objects
1805 // of a given length and return the objArrayOop
1806 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1807 if (array == NULL) {
1808 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1809 }
1810
1811 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1812 objArrayHandle array_h(THREAD, oa);
1813
1814 // array must be of the given length
1815 if (length != array_h->length()) {
1816 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1817 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1818 }
1819
1820 // check if the element of array is of type MemoryUsage class
1821 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1822 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1823 if (element_klass != usage_klass) {
1824 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1825 "The element type is not MemoryUsage class", 0);
1826 }
1827
1828 return array_h();
1829 }
1830
1831 // Gets the statistics of the last GC of a given GC memory manager.
1832 // Input parameters:
1833 // obj - GarbageCollectorMXBean object
1834 // gc_stat - caller allocated jmmGCStat where:
1835 // a. before_gc_usage - array of MemoryUsage objects
1836 // b. after_gc_usage - array of MemoryUsage objects
1837 // c. gc_ext_attributes_values_size is set to the
1838 // gc_ext_attribute_values array allocated
1839 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1840 //
1841 // On return,
1842 // gc_index == 0 indicates no GC statistics available
1843 //
1844 // before_gc_usage and after_gc_usage - filled with per memory pool
1845 // before and after GC usage in the same order as the memory pools
1846 // returned by GetMemoryPools for a given GC memory manager.
1847 // num_gc_ext_attributes indicates the number of elements in
1848 // the gc_ext_attribute_values array is filled; or
1849 // -1 if the gc_ext_attributes_values array is not big enough
1850 //
1851 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1852 ResourceMark rm(THREAD);
1853
1854 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1855 THROW(vmSymbols::java_lang_NullPointerException());
1856 }
1857
1858 // Get the GCMemoryManager
1859 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1860
1861 // Make a copy of the last GC statistics
1862 // GC may occur while constructing the last GC information
1863 int num_pools = MemoryService::num_memory_pools();
1864 GCStatInfo stat(num_pools);
1865 if (mgr->get_last_gc_stat(&stat) == 0) {
1866 gc_stat->gc_index = 0;
1867 return;
1868 }
1869
1870 gc_stat->gc_index = stat.gc_index();
1871 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1872 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1873
1874 // Current implementation does not have GC extension attributes
1875 gc_stat->num_gc_ext_attributes = 0;
1876
1877 // Fill the arrays of MemoryUsage objects with before and after GC
1878 // per pool memory usage
1879 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1880 num_pools,
1881 CHECK);
1882 objArrayHandle usage_before_gc_ah(THREAD, bu);
1883
1884 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1885 num_pools,
1886 CHECK);
1887 objArrayHandle usage_after_gc_ah(THREAD, au);
1888
1889 for (int i = 0; i < num_pools; i++) {
1890 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1891 Handle after_usage;
1892
1893 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1894 if (u.max_size() == 0 && u.used() > 0) {
1895 // If max size == 0, this pool is a survivor space.
1896 // Set max size = -1 since the pools will be swapped after GC.
1897 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1898 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1899 } else {
1900 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1901 }
1902 usage_before_gc_ah->obj_at_put(i, before_usage());
1903 usage_after_gc_ah->obj_at_put(i, after_usage());
1904 }
1905
1906 if (gc_stat->gc_ext_attribute_values_size > 0) {
1907 // Current implementation only has 1 attribute (number of GC threads)
1908 // The type is 'I'
1909 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1910 }
1911 JVM_END
1912
1913 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1914 ResourceMark rm(THREAD);
1915 // Get the GCMemoryManager
1916 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1917 mgr->set_notification_enabled(enabled?true:false);
1918 JVM_END
1919
1920 // Dump heap - Returns 0 if succeeds.
1921 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1922 #if INCLUDE_SERVICES
1923 ResourceMark rm(THREAD);
1924 oop on = JNIHandles::resolve_external_guard(outputfile);
1925 if (on == NULL) {
1926 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1927 "Output file name cannot be null.", -1);
1928 }
1929 Handle onhandle(THREAD, on);
1930 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1931 if (name == NULL) {
1932 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1933 "Output file name cannot be null.", -1);
1934 }
1935 HeapDumper dumper(live ? true : false);
1936 if (dumper.dump(name) != 0) {
1937 const char* errmsg = dumper.error_as_C_string();
1938 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1939 }
1940 return 0;
1941 #else // INCLUDE_SERVICES
1942 return -1;
1943 #endif // INCLUDE_SERVICES
1944 JVM_END
1945
1946 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1947 ResourceMark rm(THREAD);
1948 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1949 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1950 dcmd_list->length(), CHECK_NULL);
1951 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1952 for (int i = 0; i < dcmd_list->length(); i++) {
1953 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1954 cmd_array->obj_at_put(i, cmd_name);
1955 }
1956 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1957 JVM_END
1958
1959 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1960 dcmdInfo* infoArray))
1961 if (cmds == NULL || infoArray == NULL) {
1962 THROW(vmSymbols::java_lang_NullPointerException());
1963 }
1964
1965 ResourceMark rm(THREAD);
1966
1967 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1968 objArrayHandle cmds_ah(THREAD, ca);
1969
1970 // Make sure we have a String array
1971 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1972 if (element_klass != SystemDictionary::String_klass()) {
1973 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1974 "Array element type is not String class");
1975 }
1976
1977 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1978
1979 int num_cmds = cmds_ah->length();
1980 for (int i = 0; i < num_cmds; i++) {
1981 oop cmd = cmds_ah->obj_at(i);
1982 if (cmd == NULL) {
1983 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1984 "Command name cannot be null.");
1985 }
1986 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1987 if (cmd_name == NULL) {
1988 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1989 "Command name cannot be null.");
1990 }
1991 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
1992 if (pos == -1) {
1993 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1994 "Unknown diagnostic command");
1995 }
1996 DCmdInfo* info = info_list->at(pos);
1997 infoArray[i].name = info->name();
1998 infoArray[i].description = info->description();
1999 infoArray[i].impact = info->impact();
2000 JavaPermission p = info->permission();
2001 infoArray[i].permission_class = p._class;
2002 infoArray[i].permission_name = p._name;
2003 infoArray[i].permission_action = p._action;
2004 infoArray[i].num_arguments = info->num_arguments();
2005 infoArray[i].enabled = info->is_enabled();
2006 }
2007 JVM_END
2008
2009 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2010 jstring command, dcmdArgInfo* infoArray))
2011 ResourceMark rm(THREAD);
2012 oop cmd = JNIHandles::resolve_external_guard(command);
2013 if (cmd == NULL) {
2014 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2015 "Command line cannot be null.");
2016 }
2017 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2018 if (cmd_name == NULL) {
2019 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2020 "Command line content cannot be null.");
2021 }
2022 DCmd* dcmd = NULL;
2023 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2024 strlen(cmd_name));
2025 if (factory != NULL) {
2026 dcmd = factory->create_resource_instance(NULL);
2027 }
2028 if (dcmd == NULL) {
2029 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2030 "Unknown diagnostic command");
2031 }
2032 DCmdMark mark(dcmd);
2033 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2034 if (array->length() == 0) {
2035 return;
2036 }
2037 for (int i = 0; i < array->length(); i++) {
2038 infoArray[i].name = array->at(i)->name();
2039 infoArray[i].description = array->at(i)->description();
2040 infoArray[i].type = array->at(i)->type();
2041 infoArray[i].default_string = array->at(i)->default_string();
2042 infoArray[i].mandatory = array->at(i)->is_mandatory();
2043 infoArray[i].option = array->at(i)->is_option();
2044 infoArray[i].multiple = array->at(i)->is_multiple();
2045 infoArray[i].position = array->at(i)->position();
2046 }
2047 return;
2048 JVM_END
2049
2050 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2051 ResourceMark rm(THREAD);
2052 oop cmd = JNIHandles::resolve_external_guard(commandline);
2053 if (cmd == NULL) {
2054 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2055 "Command line cannot be null.");
2056 }
2057 char* cmdline = java_lang_String::as_utf8_string(cmd);
2058 if (cmdline == NULL) {
2059 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2060 "Command line content cannot be null.");
2061 }
2062 bufferedStream output;
2063 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2064 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2065 return (jstring) JNIHandles::make_local(env, result);
2066 JVM_END
2067
2068 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2069 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2070 JVM_END
2071
2072 jlong Management::ticks_to_ms(jlong ticks) {
2073 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2074 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2075 * (double)1000.0);
2076 }
2077 #endif // INCLUDE_MANAGEMENT
2078
2079 // Gets an array containing the amount of memory allocated on the Java
2080 // heap for a set of threads (in bytes). Each element of the array is
2081 // the amount of memory allocated for the thread ID specified in the
2082 // corresponding entry in the given array of thread IDs; or -1 if the
2083 // thread does not exist or has terminated.
2084 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2085 jlongArray sizeArray))
2086 // Check if threads is null
2087 if (ids == NULL || sizeArray == NULL) {
2088 THROW(vmSymbols::java_lang_NullPointerException());
2089 }
2090
2091 ResourceMark rm(THREAD);
2092 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2093 typeArrayHandle ids_ah(THREAD, ta);
2094
2095 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2096 typeArrayHandle sizeArray_h(THREAD, sa);
2097
2098 // validate the thread id array
2099 validate_thread_id_array(ids_ah, CHECK);
2100
2101 // sizeArray must be of the same length as the given array of thread IDs
2102 int num_threads = ids_ah->length();
2103 if (num_threads != sizeArray_h->length()) {
2104 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2105 "The length of the given long array does not match the length of "
2106 "the given array of thread IDs");
2107 }
2108
2109 MutexLockerEx ml(Threads_lock);
2110 for (int i = 0; i < num_threads; i++) {
2111 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2112 if (java_thread != NULL) {
2113 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2114 }
2115 }
2116 JVM_END
2117
2118 // Returns the CPU time consumed by a given thread (in nanoseconds).
2119 // If thread_id == 0, CPU time for the current thread is returned.
2120 // If user_sys_cpu_time = true, user level and system CPU time of
2121 // a given thread is returned; otherwise, only user level CPU time
2122 // is returned.
2123 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2124 if (!os::is_thread_cpu_time_supported()) {
2125 return -1;
2126 }
2127
2128 if (thread_id < 0) {
2129 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2130 "Invalid thread ID", -1);
2131 }
2132
2133 JavaThread* java_thread = NULL;
2134 if (thread_id == 0) {
2135 // current thread
2136 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2137 } else {
2138 MutexLockerEx ml(Threads_lock);
2139 java_thread = Threads::find_java_thread_from_java_tid(thread_id);
2140 if (java_thread != NULL) {
2141 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2142 }
2143 }
2144 return -1;
2145 JVM_END
2146
2147 // Gets an array containing the CPU times consumed by a set of threads
2148 // (in nanoseconds). Each element of the array is the CPU time for the
2149 // thread ID specified in the corresponding entry in the given array
2150 // of thread IDs; or -1 if the thread does not exist or has terminated.
2151 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2152 // for the given thread is returned; otherwise, only user level CPU time
2153 // is returned.
2154 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2155 jlongArray timeArray,
2156 jboolean user_sys_cpu_time))
2157 // Check if threads is null
2158 if (ids == NULL || timeArray == NULL) {
2159 THROW(vmSymbols::java_lang_NullPointerException());
2160 }
2161
2162 ResourceMark rm(THREAD);
2163 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2164 typeArrayHandle ids_ah(THREAD, ta);
2165
2166 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2167 typeArrayHandle timeArray_h(THREAD, tia);
2168
2169 // validate the thread id array
2170 validate_thread_id_array(ids_ah, CHECK);
2171
2172 // timeArray must be of the same length as the given array of thread IDs
2173 int num_threads = ids_ah->length();
2174 if (num_threads != timeArray_h->length()) {
2175 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2176 "The length of the given long array does not match the length of "
2177 "the given array of thread IDs");
2178 }
2179
2180 MutexLockerEx ml(Threads_lock);
2181 for (int i = 0; i < num_threads; i++) {
2182 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2183 if (java_thread != NULL) {
2184 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2185 user_sys_cpu_time != 0));
2186 }
2187 }
2188 JVM_END
2189
2190
2191
2192 #if INCLUDE_MANAGEMENT
2193 const struct jmmInterface_1_ jmm_interface = {
2194 NULL,
2195 NULL,
2196 jmm_GetVersion,
2197 jmm_GetOptionalSupport,
2198 jmm_GetThreadInfo,
2199 jmm_GetMemoryPools,
2200 jmm_GetMemoryManagers,
2201 jmm_GetMemoryPoolUsage,
2202 jmm_GetPeakMemoryPoolUsage,
2203 jmm_GetThreadAllocatedMemory,
2204 jmm_GetMemoryUsage,
2205 jmm_GetLongAttribute,
2206 jmm_GetBoolAttribute,
2207 jmm_SetBoolAttribute,
2208 jmm_GetLongAttributes,
2209 jmm_FindMonitorDeadlockedThreads,
2210 jmm_GetThreadCpuTime,
2211 jmm_GetVMGlobalNames,
2212 jmm_GetVMGlobals,
2213 jmm_GetInternalThreadTimes,
2214 jmm_ResetStatistic,
2215 jmm_SetPoolSensor,
2216 jmm_SetPoolThreshold,
2217 jmm_GetPoolCollectionUsage,
2218 jmm_GetGCExtAttributeInfo,
2219 jmm_GetLastGCStat,
2220 jmm_GetThreadCpuTimeWithKind,
2221 jmm_GetThreadCpuTimesWithKind,
2222 jmm_DumpHeap0,
2223 jmm_FindDeadlockedThreads,
2224 jmm_SetVMGlobal,
2225 NULL,
2226 jmm_DumpThreads,
2227 jmm_SetGCNotificationEnabled,
2228 jmm_GetDiagnosticCommands,
2229 jmm_GetDiagnosticCommandInfo,
2230 jmm_GetDiagnosticCommandArgumentsInfo,
2231 jmm_ExecuteDiagnosticCommand,
2232 jmm_SetDiagnosticFrameworkNotificationEnabled
2233 };
2234 #endif // INCLUDE_MANAGEMENT
2235
2236 void* Management::get_jmm_interface(int version) {
2237 #if INCLUDE_MANAGEMENT
2238 if (version == JMM_VERSION_1_0) {
2239 return (void*) &jmm_interface;
2240 }
2241 #endif // INCLUDE_MANAGEMENT
2242 return NULL;
2243 }