1 /*
2 * Copyright (c) 2003, 2016, 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 Klass* Management::_diagnosticCommandImpl_klass = NULL;
66 Klass* Management::_garbageCollectorExtImpl_klass = NULL;
67 Klass* Management::_garbageCollectorMXBean_klass = NULL;
68 Klass* Management::_gcInfo_klass = NULL;
69 Klass* Management::_managementFactoryHelper_klass = NULL;
70 Klass* Management::_memoryManagerMXBean_klass = NULL;
71 Klass* Management::_memoryPoolMXBean_klass = NULL;
72 Klass* Management::_memoryUsage_klass = NULL;
73 Klass* Management::_sensor_klass = NULL;
74 Klass* 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.isBootClassPathSupported = 1;
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 sun.management.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::sun_management_Agent(),
153 loader,
154 Handle(),
155 THREAD);
156 if (k == NULL) {
157 vm_exit_during_initialization("Management agent initialization failure: "
158 "class sun.management.Agent not found.");
159 }
160 instanceKlassHandle ik (THREAD, k);
161
162 JavaValue result(T_VOID);
163 JavaCalls::call_static(&result,
164 ik,
165 vmSymbols::startAgent_name(),
166 vmSymbols::void_method_signature(),
167 CHECK);
168 }
169 }
170
171 void Management::get_optional_support(jmmOptionalSupport* support) {
172 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
173 }
174
175 Klass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
176 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
177 instanceKlassHandle ik (THREAD, k);
178 if (ik->should_be_initialized()) {
179 ik->initialize(CHECK_NULL);
180 }
181 // If these classes change to not be owned by the boot loader, they need
182 // to be walked to keep their class loader alive in oops_do.
183 assert(ik->class_loader() == NULL, "need to follow in oops_do");
184 return ik();
185 }
186
187 void Management::record_vm_startup_time(jlong begin, jlong duration) {
188 // if the performance counter is not initialized,
189 // then vm initialization failed; simply return.
190 if (_begin_vm_creation_time == NULL) return;
191
192 _begin_vm_creation_time->set_value(begin);
193 _end_vm_creation_time->set_value(begin + duration);
194 PerfMemory::set_accessible(true);
195 }
196
197 jlong Management::timestamp() {
198 TimeStamp t;
199 t.update();
200 return t.ticks() - _stamp.ticks();
201 }
202
203 void Management::oops_do(OopClosure* f) {
204 MemoryService::oops_do(f);
205 ThreadService::oops_do(f);
206 }
207
208 Klass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
209 if (_threadInfo_klass == NULL) {
210 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
211 }
212 return _threadInfo_klass;
213 }
214
215 Klass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
216 if (_memoryUsage_klass == NULL) {
217 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
218 }
219 return _memoryUsage_klass;
220 }
221
222 Klass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
223 if (_memoryPoolMXBean_klass == NULL) {
224 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
225 }
226 return _memoryPoolMXBean_klass;
227 }
228
229 Klass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
230 if (_memoryManagerMXBean_klass == NULL) {
231 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
232 }
233 return _memoryManagerMXBean_klass;
234 }
235
236 Klass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
237 if (_garbageCollectorMXBean_klass == NULL) {
238 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
239 }
240 return _garbageCollectorMXBean_klass;
241 }
242
243 Klass* Management::sun_management_Sensor_klass(TRAPS) {
244 if (_sensor_klass == NULL) {
245 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
246 }
247 return _sensor_klass;
248 }
249
250 Klass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
251 if (_managementFactoryHelper_klass == NULL) {
252 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
253 }
254 return _managementFactoryHelper_klass;
255 }
256
257 Klass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
258 if (_garbageCollectorExtImpl_klass == NULL) {
259 _garbageCollectorExtImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
260 }
261 return _garbageCollectorExtImpl_klass;
262 }
263
264 Klass* Management::com_sun_management_GcInfo_klass(TRAPS) {
265 if (_gcInfo_klass == NULL) {
266 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
267 }
268 return _gcInfo_klass;
269 }
270
271 Klass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
272 if (_diagnosticCommandImpl_klass == NULL) {
273 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
274 }
275 return _diagnosticCommandImpl_klass;
276 }
277
278 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
279 Handle snapshot_thread(THREAD, snapshot->threadObj());
280
281 jlong contended_time;
282 jlong waited_time;
283 if (ThreadService::is_thread_monitoring_contention()) {
284 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
285 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
286 } else {
287 // set them to -1 if thread contention monitoring is disabled.
288 contended_time = max_julong;
289 waited_time = max_julong;
290 }
291
292 int thread_status = snapshot->thread_status();
293 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
294 if (snapshot->is_ext_suspended()) {
295 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
296 }
297 if (snapshot->is_in_native()) {
298 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
299 }
300
301 ThreadStackTrace* st = snapshot->get_stack_trace();
302 Handle stacktrace_h;
303 if (st != NULL) {
304 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
305 } else {
306 stacktrace_h = Handle();
307 }
308
309 args->push_oop(snapshot_thread);
310 args->push_int(thread_status);
311 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
312 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
313 args->push_long(snapshot->contended_enter_count());
314 args->push_long(contended_time);
315 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
316 args->push_long(waited_time);
317 args->push_oop(stacktrace_h);
318 }
319
320 // Helper function to construct a ThreadInfo object
321 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
322 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
323 instanceKlassHandle ik (THREAD, k);
324
325 JavaValue result(T_VOID);
326 JavaCallArguments args(14);
327
328 // First allocate a ThreadObj object and
329 // push the receiver as the first argument
330 Handle element = ik->allocate_instance_handle(CHECK_NULL);
331 args.push_oop(element);
332
333 // initialize the arguments for the ThreadInfo constructor
334 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
335
336 // Call ThreadInfo constructor with no locked monitors and synchronizers
337 JavaCalls::call_special(&result,
338 ik,
339 vmSymbols::object_initializer_name(),
340 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
341 &args,
342 CHECK_NULL);
343
344 return (instanceOop) element();
345 }
346
347 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
348 objArrayHandle monitors_array,
349 typeArrayHandle depths_array,
350 objArrayHandle synchronizers_array,
351 TRAPS) {
352 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
353 instanceKlassHandle ik (THREAD, k);
354
355 JavaValue result(T_VOID);
356 JavaCallArguments args(17);
357
358 // First allocate a ThreadObj object and
359 // push the receiver as the first argument
360 Handle element = ik->allocate_instance_handle(CHECK_NULL);
361 args.push_oop(element);
362
363 // initialize the arguments for the ThreadInfo constructor
364 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
365
366 // push the locked monitors and synchronizers in the arguments
367 args.push_oop(monitors_array);
368 args.push_oop(depths_array);
369 args.push_oop(synchronizers_array);
370
371 // Call ThreadInfo constructor with locked monitors and synchronizers
372 JavaCalls::call_special(&result,
373 ik,
374 vmSymbols::object_initializer_name(),
375 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
376 &args,
377 CHECK_NULL);
378
379 return (instanceOop) element();
380 }
381
382
383 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
384 if (mgr == NULL) {
385 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
386 }
387 oop mgr_obj = JNIHandles::resolve(mgr);
388 instanceHandle h(THREAD, (instanceOop) mgr_obj);
389
390 Klass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
391 if (!h->is_a(k)) {
392 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
393 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
394 NULL);
395 }
396
397 MemoryManager* gc = MemoryService::get_memory_manager(h);
398 if (gc == NULL || !gc->is_gc_memory_manager()) {
399 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
400 "Invalid GC memory manager",
401 NULL);
402 }
403 return (GCMemoryManager*) gc;
404 }
405
406 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
407 if (obj == NULL) {
408 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
409 }
410
411 oop pool_obj = JNIHandles::resolve(obj);
412 assert(pool_obj->is_instance(), "Should be an instanceOop");
413 instanceHandle ph(THREAD, (instanceOop) pool_obj);
414
415 return MemoryService::get_memory_pool(ph);
416 }
417
418 #endif // INCLUDE_MANAGEMENT
419
420 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
421 int num_threads = ids_ah->length();
422
423 // Validate input thread IDs
424 int i = 0;
425 for (i = 0; i < num_threads; i++) {
426 jlong tid = ids_ah->long_at(i);
427 if (tid <= 0) {
428 // throw exception if invalid thread id.
429 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
430 "Invalid thread ID entry");
431 }
432 }
433 }
434
435 #if INCLUDE_MANAGEMENT
436
437 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
438 // check if the element of infoArray is of type ThreadInfo class
439 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
440 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
441 if (element_klass != threadinfo_klass) {
442 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
443 "infoArray element type is not ThreadInfo class");
444 }
445 }
446
447
448 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
449 if (obj == NULL) {
450 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
451 }
452
453 oop mgr_obj = JNIHandles::resolve(obj);
454 assert(mgr_obj->is_instance(), "Should be an instanceOop");
455 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
456
457 return MemoryService::get_memory_manager(mh);
458 }
459
460 // Returns a version string and sets major and minor version if
461 // the input parameters are non-null.
462 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
463 return JMM_VERSION;
464 JVM_END
465
466 // Gets the list of VM monitoring and management optional supports
467 // Returns 0 if succeeded; otherwise returns non-zero.
468 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
469 if (support == NULL) {
470 return -1;
471 }
472 Management::get_optional_support(support);
473 return 0;
474 JVM_END
475
476 // Returns an array of java/lang/management/MemoryPoolMXBean object
477 // one for each memory pool if obj == null; otherwise returns
478 // an array of memory pools for a given memory manager if
479 // it is a valid memory manager.
480 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
481 ResourceMark rm(THREAD);
482
483 int num_memory_pools;
484 MemoryManager* mgr = NULL;
485 if (obj == NULL) {
486 num_memory_pools = MemoryService::num_memory_pools();
487 } else {
488 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
489 if (mgr == NULL) {
490 return NULL;
491 }
492 num_memory_pools = mgr->num_memory_pools();
493 }
494
495 // Allocate the resulting MemoryPoolMXBean[] object
496 Klass* k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
497 instanceKlassHandle ik (THREAD, k);
498 objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
499 objArrayHandle poolArray(THREAD, r);
500
501 if (mgr == NULL) {
502 // Get all memory pools
503 for (int i = 0; i < num_memory_pools; i++) {
504 MemoryPool* pool = MemoryService::get_memory_pool(i);
505 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
506 instanceHandle ph(THREAD, p);
507 poolArray->obj_at_put(i, ph());
508 }
509 } else {
510 // Get memory pools managed by a given memory manager
511 for (int i = 0; i < num_memory_pools; i++) {
512 MemoryPool* pool = mgr->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 }
518 return (jobjectArray) JNIHandles::make_local(env, poolArray());
519 JVM_END
520
521 // Returns an array of java/lang/management/MemoryManagerMXBean object
522 // one for each memory manager if obj == null; otherwise returns
523 // an array of memory managers for a given memory pool if
524 // it is a valid memory pool.
525 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
526 ResourceMark rm(THREAD);
527
528 int num_mgrs;
529 MemoryPool* pool = NULL;
530 if (obj == NULL) {
531 num_mgrs = MemoryService::num_memory_managers();
532 } else {
533 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
534 if (pool == NULL) {
535 return NULL;
536 }
537 num_mgrs = pool->num_memory_managers();
538 }
539
540 // Allocate the resulting MemoryManagerMXBean[] object
541 Klass* k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
542 instanceKlassHandle ik (THREAD, k);
543 objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
544 objArrayHandle mgrArray(THREAD, r);
545
546 if (pool == NULL) {
547 // Get all memory managers
548 for (int i = 0; i < num_mgrs; i++) {
549 MemoryManager* mgr = MemoryService::get_memory_manager(i);
550 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
551 instanceHandle ph(THREAD, p);
552 mgrArray->obj_at_put(i, ph());
553 }
554 } else {
555 // Get memory managers for a given memory pool
556 for (int i = 0; i < num_mgrs; i++) {
557 MemoryManager* mgr = pool->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 }
563 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
564 JVM_END
565
566
567 // Returns a java/lang/management/MemoryUsage object containing the memory usage
568 // of a given memory pool.
569 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
570 ResourceMark rm(THREAD);
571
572 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
573 if (pool != NULL) {
574 MemoryUsage usage = pool->get_memory_usage();
575 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
576 return JNIHandles::make_local(env, h());
577 } else {
578 return NULL;
579 }
580 JVM_END
581
582 // Returns a java/lang/management/MemoryUsage object containing the memory usage
583 // of a given memory pool.
584 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
585 ResourceMark rm(THREAD);
586
587 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
588 if (pool != NULL) {
589 MemoryUsage usage = pool->get_peak_memory_usage();
590 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
591 return JNIHandles::make_local(env, h());
592 } else {
593 return NULL;
594 }
595 JVM_END
596
597 // Returns a java/lang/management/MemoryUsage object containing the memory usage
598 // of a given memory pool after most recent GC.
599 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
600 ResourceMark rm(THREAD);
601
602 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
603 if (pool != NULL && pool->is_collected_pool()) {
604 MemoryUsage usage = pool->get_last_collection_usage();
605 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
606 return JNIHandles::make_local(env, h());
607 } else {
608 return NULL;
609 }
610 JVM_END
611
612 // Sets the memory pool sensor for a threshold type
613 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
614 if (obj == NULL || sensorObj == NULL) {
615 THROW(vmSymbols::java_lang_NullPointerException());
616 }
617
618 Klass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
619 oop s = JNIHandles::resolve(sensorObj);
620 assert(s->is_instance(), "Sensor should be an instanceOop");
621 instanceHandle sensor_h(THREAD, (instanceOop) s);
622 if (!sensor_h->is_a(sensor_klass)) {
623 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
624 "Sensor is not an instance of sun.management.Sensor class");
625 }
626
627 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
628 assert(mpool != NULL, "MemoryPool should exist");
629
630 switch (type) {
631 case JMM_USAGE_THRESHOLD_HIGH:
632 case JMM_USAGE_THRESHOLD_LOW:
633 // have only one sensor for threshold high and low
634 mpool->set_usage_sensor_obj(sensor_h);
635 break;
636 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
637 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
638 // have only one sensor for threshold high and low
639 mpool->set_gc_usage_sensor_obj(sensor_h);
640 break;
641 default:
642 assert(false, "Unrecognized type");
643 }
644
645 JVM_END
646
647
648 // Sets the threshold of a given memory pool.
649 // Returns the previous threshold.
650 //
651 // Input parameters:
652 // pool - the MemoryPoolMXBean object
653 // type - threshold type
654 // threshold - the new threshold (must not be negative)
655 //
656 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
657 if (threshold < 0) {
658 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
659 "Invalid threshold value",
660 -1);
661 }
662
663 if ((size_t)threshold > max_uintx) {
664 stringStream st;
665 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
666 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
667 }
668
669 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
670 assert(pool != NULL, "MemoryPool should exist");
671
672 jlong prev = 0;
673 switch (type) {
674 case JMM_USAGE_THRESHOLD_HIGH:
675 if (!pool->usage_threshold()->is_high_threshold_supported()) {
676 return -1;
677 }
678 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
679 break;
680
681 case JMM_USAGE_THRESHOLD_LOW:
682 if (!pool->usage_threshold()->is_low_threshold_supported()) {
683 return -1;
684 }
685 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
686 break;
687
688 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
689 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
690 return -1;
691 }
692 // return and the new threshold is effective for the next GC
693 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
694
695 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
696 if (!pool->gc_usage_threshold()->is_low_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_low_threshold((size_t) threshold);
701
702 default:
703 assert(false, "Unrecognized type");
704 return -1;
705 }
706
707 // When the threshold is changed, reevaluate if the low memory
708 // detection is enabled.
709 if (prev != threshold) {
710 LowMemoryDetector::recompute_enabled_for_collected_pools();
711 LowMemoryDetector::detect_low_memory(pool);
712 }
713 return prev;
714 JVM_END
715
716 // Returns a java/lang/management/MemoryUsage object representing
717 // the memory usage for the heap or non-heap memory.
718 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
719 ResourceMark rm(THREAD);
720
721 // Calculate the memory usage
722 size_t total_init = 0;
723 size_t total_used = 0;
724 size_t total_committed = 0;
725 size_t total_max = 0;
726 bool has_undefined_init_size = false;
727 bool has_undefined_max_size = false;
728
729 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
730 MemoryPool* pool = MemoryService::get_memory_pool(i);
731 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
732 MemoryUsage u = pool->get_memory_usage();
733 total_used += u.used();
734 total_committed += u.committed();
735
736 if (u.init_size() == (size_t)-1) {
737 has_undefined_init_size = true;
738 }
739 if (!has_undefined_init_size) {
740 total_init += u.init_size();
741 }
742
743 if (u.max_size() == (size_t)-1) {
744 has_undefined_max_size = true;
745 }
746 if (!has_undefined_max_size) {
747 total_max += u.max_size();
748 }
749 }
750 }
751
752 // if any one of the memory pool has undefined init_size or max_size,
753 // set it to -1
754 if (has_undefined_init_size) {
755 total_init = (size_t)-1;
756 }
757 if (has_undefined_max_size) {
758 total_max = (size_t)-1;
759 }
760
761 MemoryUsage usage((heap ? InitialHeapSize : total_init),
762 total_used,
763 total_committed,
764 (heap ? Universe::heap()->max_capacity() : total_max));
765
766 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
767 return JNIHandles::make_local(env, obj());
768 JVM_END
769
770 // Returns the boolean value of a given attribute.
771 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
772 switch (att) {
773 case JMM_VERBOSE_GC:
774 return MemoryService::get_verbose();
775 case JMM_VERBOSE_CLASS:
776 return ClassLoadingService::get_verbose();
777 case JMM_THREAD_CONTENTION_MONITORING:
778 return ThreadService::is_thread_monitoring_contention();
779 case JMM_THREAD_CPU_TIME:
780 return ThreadService::is_thread_cpu_time_enabled();
781 case JMM_THREAD_ALLOCATED_MEMORY:
782 return ThreadService::is_thread_allocated_memory_enabled();
783 default:
784 assert(0, "Unrecognized attribute");
785 return false;
786 }
787 JVM_END
788
789 // Sets the given boolean attribute and returns the previous value.
790 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
791 switch (att) {
792 case JMM_VERBOSE_GC:
793 return MemoryService::set_verbose(flag != 0);
794 case JMM_VERBOSE_CLASS:
795 return ClassLoadingService::set_verbose(flag != 0);
796 case JMM_THREAD_CONTENTION_MONITORING:
797 return ThreadService::set_thread_monitoring_contention(flag != 0);
798 case JMM_THREAD_CPU_TIME:
799 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
800 case JMM_THREAD_ALLOCATED_MEMORY:
801 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
802 default:
803 assert(0, "Unrecognized attribute");
804 return false;
805 }
806 JVM_END
807
808
809 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
810 switch (att) {
811 case JMM_GC_TIME_MS:
812 return mgr->gc_time_ms();
813
814 case JMM_GC_COUNT:
815 return mgr->gc_count();
816
817 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
818 // current implementation only has 1 ext attribute
819 return 1;
820
821 default:
822 assert(0, "Unrecognized GC attribute");
823 return -1;
824 }
825 }
826
827 class VmThreadCountClosure: public ThreadClosure {
828 private:
829 int _count;
830 public:
831 VmThreadCountClosure() : _count(0) {};
832 void do_thread(Thread* thread);
833 int count() { return _count; }
834 };
835
836 void VmThreadCountClosure::do_thread(Thread* thread) {
837 // exclude externally visible JavaThreads
838 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
839 return;
840 }
841
842 _count++;
843 }
844
845 static jint get_vm_thread_count() {
846 VmThreadCountClosure vmtcc;
847 {
848 MutexLockerEx ml(Threads_lock);
849 Threads::threads_do(&vmtcc);
850 }
851
852 return vmtcc.count();
853 }
854
855 static jint get_num_flags() {
856 // last flag entry is always NULL, so subtract 1
857 int nFlags = (int) Flag::numFlags - 1;
858 int count = 0;
859 for (int i = 0; i < nFlags; i++) {
860 Flag* flag = &Flag::flags[i];
861 // Exclude the locked (diagnostic, experimental) flags
862 if (flag->is_unlocked() || flag->is_unlocker()) {
863 count++;
864 }
865 }
866 return count;
867 }
868
869 static jlong get_long_attribute(jmmLongAttribute att) {
870 switch (att) {
871 case JMM_CLASS_LOADED_COUNT:
872 return ClassLoadingService::loaded_class_count();
873
874 case JMM_CLASS_UNLOADED_COUNT:
875 return ClassLoadingService::unloaded_class_count();
876
877 case JMM_THREAD_TOTAL_COUNT:
878 return ThreadService::get_total_thread_count();
879
880 case JMM_THREAD_LIVE_COUNT:
881 return ThreadService::get_live_thread_count();
882
883 case JMM_THREAD_PEAK_COUNT:
884 return ThreadService::get_peak_thread_count();
885
886 case JMM_THREAD_DAEMON_COUNT:
887 return ThreadService::get_daemon_thread_count();
888
889 case JMM_JVM_INIT_DONE_TIME_MS:
890 return Management::vm_init_done_time();
891
892 case JMM_JVM_UPTIME_MS:
893 return Management::ticks_to_ms(os::elapsed_counter());
894
895 case JMM_COMPILE_TOTAL_TIME_MS:
896 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
897
898 case JMM_OS_PROCESS_ID:
899 return os::current_process_id();
900
901 // Hotspot-specific counters
902 case JMM_CLASS_LOADED_BYTES:
903 return ClassLoadingService::loaded_class_bytes();
904
905 case JMM_CLASS_UNLOADED_BYTES:
906 return ClassLoadingService::unloaded_class_bytes();
907
908 case JMM_SHARED_CLASS_LOADED_COUNT:
909 return ClassLoadingService::loaded_shared_class_count();
910
911 case JMM_SHARED_CLASS_UNLOADED_COUNT:
912 return ClassLoadingService::unloaded_shared_class_count();
913
914
915 case JMM_SHARED_CLASS_LOADED_BYTES:
916 return ClassLoadingService::loaded_shared_class_bytes();
917
918 case JMM_SHARED_CLASS_UNLOADED_BYTES:
919 return ClassLoadingService::unloaded_shared_class_bytes();
920
921 case JMM_TOTAL_CLASSLOAD_TIME_MS:
922 return ClassLoader::classloader_time_ms();
923
924 case JMM_VM_GLOBAL_COUNT:
925 return get_num_flags();
926
927 case JMM_SAFEPOINT_COUNT:
928 return RuntimeService::safepoint_count();
929
930 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
931 return RuntimeService::safepoint_sync_time_ms();
932
933 case JMM_TOTAL_STOPPED_TIME_MS:
934 return RuntimeService::safepoint_time_ms();
935
936 case JMM_TOTAL_APP_TIME_MS:
937 return RuntimeService::application_time_ms();
938
939 case JMM_VM_THREAD_COUNT:
940 return get_vm_thread_count();
941
942 case JMM_CLASS_INIT_TOTAL_COUNT:
943 return ClassLoader::class_init_count();
944
945 case JMM_CLASS_INIT_TOTAL_TIME_MS:
946 return ClassLoader::class_init_time_ms();
947
948 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
949 return ClassLoader::class_verify_time_ms();
950
951 case JMM_METHOD_DATA_SIZE_BYTES:
952 return ClassLoadingService::class_method_data_size();
953
954 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
955 return os::physical_memory();
956
957 default:
958 return -1;
959 }
960 }
961
962
963 // Returns the long value of a given attribute.
964 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
965 if (obj == NULL) {
966 return get_long_attribute(att);
967 } else {
968 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
969 if (mgr != NULL) {
970 return get_gc_attribute(mgr, att);
971 }
972 }
973 return -1;
974 JVM_END
975
976 // Gets the value of all attributes specified in the given array
977 // and sets the value in the result array.
978 // Returns the number of attributes found.
979 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
980 jobject obj,
981 jmmLongAttribute* atts,
982 jint count,
983 jlong* result))
984
985 int num_atts = 0;
986 if (obj == NULL) {
987 for (int i = 0; i < count; i++) {
988 result[i] = get_long_attribute(atts[i]);
989 if (result[i] != -1) {
990 num_atts++;
991 }
992 }
993 } else {
994 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
995 for (int i = 0; i < count; i++) {
996 result[i] = get_gc_attribute(mgr, atts[i]);
997 if (result[i] != -1) {
998 num_atts++;
999 }
1000 }
1001 }
1002 return num_atts;
1003 JVM_END
1004
1005 // Helper function to do thread dump for a specific list of threads
1006 static void do_thread_dump(ThreadDumpResult* dump_result,
1007 typeArrayHandle ids_ah, // array of thread ID (long[])
1008 int num_threads,
1009 int max_depth,
1010 bool with_locked_monitors,
1011 bool with_locked_synchronizers,
1012 TRAPS) {
1013 // no need to actually perform thread dump if no TIDs are specified
1014 if (num_threads == 0) return;
1015
1016 // First get an array of threadObj handles.
1017 // A JavaThread may terminate before we get the stack trace.
1018 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1019 {
1020 MutexLockerEx ml(Threads_lock);
1021 for (int i = 0; i < num_threads; i++) {
1022 jlong tid = ids_ah->long_at(i);
1023 JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1024 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1025 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1026 thread_handle_array->append(threadObj_h);
1027 }
1028 }
1029
1030 // Obtain thread dumps and thread snapshot information
1031 VM_ThreadDump op(dump_result,
1032 thread_handle_array,
1033 num_threads,
1034 max_depth, /* stack depth */
1035 with_locked_monitors,
1036 with_locked_synchronizers);
1037 VMThread::execute(&op);
1038 }
1039
1040 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1041 // for the thread ID specified in the corresponding entry in
1042 // the given array of thread IDs; or NULL if the thread does not exist
1043 // or has terminated.
1044 //
1045 // Input parameters:
1046 // ids - array of thread IDs
1047 // maxDepth - the maximum depth of stack traces to be dumped:
1048 // maxDepth == -1 requests to dump entire stack trace.
1049 // maxDepth == 0 requests no stack trace.
1050 // infoArray - array of ThreadInfo objects
1051 //
1052 // QQQ - Why does this method return a value instead of void?
1053 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1054 // Check if threads is null
1055 if (ids == NULL || infoArray == NULL) {
1056 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1057 }
1058
1059 if (maxDepth < -1) {
1060 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1061 "Invalid maxDepth", -1);
1062 }
1063
1064 ResourceMark rm(THREAD);
1065 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1066 typeArrayHandle ids_ah(THREAD, ta);
1067
1068 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1069 objArrayOop oa = objArrayOop(infoArray_obj);
1070 objArrayHandle infoArray_h(THREAD, oa);
1071
1072 // validate the thread id array
1073 validate_thread_id_array(ids_ah, CHECK_0);
1074
1075 // validate the ThreadInfo[] parameters
1076 validate_thread_info_array(infoArray_h, CHECK_0);
1077
1078 // infoArray must be of the same length as the given array of thread IDs
1079 int num_threads = ids_ah->length();
1080 if (num_threads != infoArray_h->length()) {
1081 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1082 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1083 }
1084
1085 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1086 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1087
1088 // Must use ThreadDumpResult to store the ThreadSnapshot.
1089 // GC may occur after the thread snapshots are taken but before
1090 // this function returns. The threadObj and other oops kept
1091 // in the ThreadSnapshot are marked and adjusted during GC.
1092 ThreadDumpResult dump_result(num_threads);
1093
1094 if (maxDepth == 0) {
1095 // no stack trace dumped - do not need to stop the world
1096 {
1097 MutexLockerEx ml(Threads_lock);
1098 for (int i = 0; i < num_threads; i++) {
1099 jlong tid = ids_ah->long_at(i);
1100 JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1101 ThreadSnapshot* ts;
1102 if (jt == NULL) {
1103 // if the thread does not exist or now it is terminated,
1104 // create dummy snapshot
1105 ts = new ThreadSnapshot();
1106 } else {
1107 ts = new ThreadSnapshot(jt);
1108 }
1109 dump_result.add_thread_snapshot(ts);
1110 }
1111 }
1112 } else {
1113 // obtain thread dump with the specific list of threads with stack trace
1114 do_thread_dump(&dump_result,
1115 ids_ah,
1116 num_threads,
1117 maxDepth,
1118 false, /* no locked monitor */
1119 false, /* no locked synchronizers */
1120 CHECK_0);
1121 }
1122
1123 int num_snapshots = dump_result.num_snapshots();
1124 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1125 int index = 0;
1126 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1127 // For each thread, create an java/lang/management/ThreadInfo object
1128 // and fill with the thread information
1129
1130 if (ts->threadObj() == NULL) {
1131 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1132 infoArray_h->obj_at_put(index, NULL);
1133 continue;
1134 }
1135
1136 // Create java.lang.management.ThreadInfo object
1137 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1138 infoArray_h->obj_at_put(index, info_obj);
1139 }
1140 return 0;
1141 JVM_END
1142
1143 // Dump thread info for the specified threads.
1144 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1145 // for the thread ID specified in the corresponding entry in
1146 // the given array of thread IDs; or NULL if the thread does not exist
1147 // or has terminated.
1148 //
1149 // Input parameter:
1150 // ids - array of thread IDs; NULL indicates all live threads
1151 // locked_monitors - if true, dump locked object monitors
1152 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1153 //
1154 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1155 ResourceMark rm(THREAD);
1156
1157 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1158 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1159
1160 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1161 int num_threads = (ta != NULL ? ta->length() : 0);
1162 typeArrayHandle ids_ah(THREAD, ta);
1163
1164 ThreadDumpResult dump_result(num_threads); // can safepoint
1165
1166 if (ids_ah() != NULL) {
1167
1168 // validate the thread id array
1169 validate_thread_id_array(ids_ah, CHECK_NULL);
1170
1171 // obtain thread dump of a specific list of threads
1172 do_thread_dump(&dump_result,
1173 ids_ah,
1174 num_threads,
1175 -1, /* entire stack */
1176 (locked_monitors ? true : false), /* with locked monitors */
1177 (locked_synchronizers ? true : false), /* with locked synchronizers */
1178 CHECK_NULL);
1179 } else {
1180 // obtain thread dump of all threads
1181 VM_ThreadDump op(&dump_result,
1182 -1, /* entire stack */
1183 (locked_monitors ? true : false), /* with locked monitors */
1184 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1185 VMThread::execute(&op);
1186 }
1187
1188 int num_snapshots = dump_result.num_snapshots();
1189
1190 // create the result ThreadInfo[] object
1191 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1192 instanceKlassHandle ik (THREAD, k);
1193 objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
1194 objArrayHandle result_h(THREAD, r);
1195
1196 int index = 0;
1197 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1198 if (ts->threadObj() == NULL) {
1199 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1200 result_h->obj_at_put(index, NULL);
1201 continue;
1202 }
1203
1204 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1205 assert(stacktrace != NULL, "Must have a stack trace dumped");
1206
1207 // Create Object[] filled with locked monitors
1208 // Create int[] filled with the stack depth where a monitor was locked
1209 int num_frames = stacktrace->get_stack_depth();
1210 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1211
1212 // Count the total number of locked monitors
1213 for (int i = 0; i < num_frames; i++) {
1214 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1215 num_locked_monitors += frame->num_locked_monitors();
1216 }
1217
1218 objArrayHandle monitors_array;
1219 typeArrayHandle depths_array;
1220 objArrayHandle synchronizers_array;
1221
1222 if (locked_monitors) {
1223 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1224 // where the thread locked it
1225 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1226 objArrayHandle mh(THREAD, array);
1227 monitors_array = mh;
1228
1229 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1230 typeArrayHandle dh(THREAD, tarray);
1231 depths_array = dh;
1232
1233 int count = 0;
1234 int j = 0;
1235 for (int depth = 0; depth < num_frames; depth++) {
1236 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1237 int len = frame->num_locked_monitors();
1238 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1239 for (j = 0; j < len; j++) {
1240 oop monitor = locked_monitors->at(j);
1241 assert(monitor != NULL, "must be a Java object");
1242 monitors_array->obj_at_put(count, monitor);
1243 depths_array->int_at_put(count, depth);
1244 count++;
1245 }
1246 }
1247
1248 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1249 for (j = 0; j < jni_locked_monitors->length(); j++) {
1250 oop object = jni_locked_monitors->at(j);
1251 assert(object != NULL, "must be a Java object");
1252 monitors_array->obj_at_put(count, object);
1253 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1254 depths_array->int_at_put(count, -1);
1255 count++;
1256 }
1257 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1258 }
1259
1260 if (locked_synchronizers) {
1261 // Create Object[] filled with locked JSR-166 synchronizers
1262 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1263 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1264 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1265 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1266
1267 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1268 objArrayHandle sh(THREAD, array);
1269 synchronizers_array = sh;
1270
1271 for (int k = 0; k < num_locked_synchronizers; k++) {
1272 synchronizers_array->obj_at_put(k, locks->at(k));
1273 }
1274 }
1275
1276 // Create java.lang.management.ThreadInfo object
1277 instanceOop info_obj = Management::create_thread_info_instance(ts,
1278 monitors_array,
1279 depths_array,
1280 synchronizers_array,
1281 CHECK_NULL);
1282 result_h->obj_at_put(index, info_obj);
1283 }
1284
1285 return (jobjectArray) JNIHandles::make_local(env, result_h());
1286 JVM_END
1287
1288 // Returns an array of Class objects.
1289 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
1290 ResourceMark rm(THREAD);
1291
1292 LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter
1293
1294 int num_classes = lce.num_loaded_classes();
1295 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
1296 objArrayHandle classes_ah(THREAD, r);
1297
1298 for (int i = 0; i < num_classes; i++) {
1299 KlassHandle kh = lce.get_klass(i);
1300 oop mirror = kh()->java_mirror();
1301 classes_ah->obj_at_put(i, mirror);
1302 }
1303
1304 return (jobjectArray) JNIHandles::make_local(env, classes_ah());
1305 JVM_END
1306
1307 // Reset statistic. Return true if the requested statistic is reset.
1308 // Otherwise, return false.
1309 //
1310 // Input parameters:
1311 // obj - specify which instance the statistic associated with to be reset
1312 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1313 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1314 // type - the type of statistic to be reset
1315 //
1316 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1317 ResourceMark rm(THREAD);
1318
1319 switch (type) {
1320 case JMM_STAT_PEAK_THREAD_COUNT:
1321 ThreadService::reset_peak_thread_count();
1322 return true;
1323
1324 case JMM_STAT_THREAD_CONTENTION_COUNT:
1325 case JMM_STAT_THREAD_CONTENTION_TIME: {
1326 jlong tid = obj.j;
1327 if (tid < 0) {
1328 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1329 }
1330
1331 // Look for the JavaThread of this given tid
1332 MutexLockerEx ml(Threads_lock);
1333 if (tid == 0) {
1334 // reset contention statistics for all threads if tid == 0
1335 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
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 } else {
1343 // reset contention statistics for a given thread
1344 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(tid);
1345 if (java_thread == NULL) {
1346 return false;
1347 }
1348
1349 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1350 ThreadService::reset_contention_count_stat(java_thread);
1351 } else {
1352 ThreadService::reset_contention_time_stat(java_thread);
1353 }
1354 }
1355 return true;
1356 break;
1357 }
1358 case JMM_STAT_PEAK_POOL_USAGE: {
1359 jobject o = obj.l;
1360 if (o == NULL) {
1361 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1362 }
1363
1364 oop pool_obj = JNIHandles::resolve(o);
1365 assert(pool_obj->is_instance(), "Should be an instanceOop");
1366 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1367
1368 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1369 if (pool != NULL) {
1370 pool->reset_peak_memory_usage();
1371 return true;
1372 }
1373 break;
1374 }
1375 case JMM_STAT_GC_STAT: {
1376 jobject o = obj.l;
1377 if (o == NULL) {
1378 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1379 }
1380
1381 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1382 if (mgr != NULL) {
1383 mgr->reset_gc_stat();
1384 return true;
1385 }
1386 break;
1387 }
1388 default:
1389 assert(0, "Unknown Statistic Type");
1390 }
1391 return false;
1392 JVM_END
1393
1394 // Returns the fast estimate of CPU time consumed by
1395 // a given thread (in nanoseconds).
1396 // If thread_id == 0, return CPU time for the current thread.
1397 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1398 if (!os::is_thread_cpu_time_supported()) {
1399 return -1;
1400 }
1401
1402 if (thread_id < 0) {
1403 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1404 "Invalid thread ID", -1);
1405 }
1406
1407 JavaThread* java_thread = NULL;
1408 if (thread_id == 0) {
1409 // current thread
1410 return os::current_thread_cpu_time();
1411 } else {
1412 MutexLockerEx ml(Threads_lock);
1413 java_thread = Threads::find_java_thread_from_java_tid(thread_id);
1414 if (java_thread != NULL) {
1415 return os::thread_cpu_time((Thread*) java_thread);
1416 }
1417 }
1418 return -1;
1419 JVM_END
1420
1421 // Returns a String array of all VM global flag names
1422 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1423 // last flag entry is always NULL, so subtract 1
1424 int nFlags = (int) Flag::numFlags - 1;
1425 // allocate a temp array
1426 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1427 nFlags, CHECK_0);
1428 objArrayHandle flags_ah(THREAD, r);
1429 int num_entries = 0;
1430 for (int i = 0; i < nFlags; i++) {
1431 Flag* flag = &Flag::flags[i];
1432 // Exclude notproduct and develop flags in product builds.
1433 if (flag->is_constant_in_binary()) {
1434 continue;
1435 }
1436 // Exclude the locked (experimental, diagnostic) flags
1437 if (flag->is_unlocked() || flag->is_unlocker()) {
1438 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1439 flags_ah->obj_at_put(num_entries, s());
1440 num_entries++;
1441 }
1442 }
1443
1444 if (num_entries < nFlags) {
1445 // Return array of right length
1446 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1447 for(int i = 0; i < num_entries; i++) {
1448 res->obj_at_put(i, flags_ah->obj_at(i));
1449 }
1450 return (jobjectArray)JNIHandles::make_local(env, res);
1451 }
1452
1453 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1454 JVM_END
1455
1456 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1457 // can't be determined, true otherwise. If false is returned, then *global
1458 // will be incomplete and invalid.
1459 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1460 Handle flag_name;
1461 if (name() == NULL) {
1462 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1463 } else {
1464 flag_name = name;
1465 }
1466 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1467
1468 if (flag->is_bool()) {
1469 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1470 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1471 } else if (flag->is_int()) {
1472 global->value.j = (jlong)flag->get_int();
1473 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1474 } else if (flag->is_uint()) {
1475 global->value.j = (jlong)flag->get_uint();
1476 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1477 } else if (flag->is_intx()) {
1478 global->value.j = (jlong)flag->get_intx();
1479 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1480 } else if (flag->is_uintx()) {
1481 global->value.j = (jlong)flag->get_uintx();
1482 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1483 } else if (flag->is_uint64_t()) {
1484 global->value.j = (jlong)flag->get_uint64_t();
1485 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1486 } else if (flag->is_double()) {
1487 global->value.d = (jdouble)flag->get_double();
1488 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1489 } else if (flag->is_size_t()) {
1490 global->value.j = (jlong)flag->get_size_t();
1491 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1492 } else if (flag->is_ccstr()) {
1493 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1494 global->value.l = (jobject)JNIHandles::make_local(env, str());
1495 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1496 } else {
1497 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1498 return false;
1499 }
1500
1501 global->writeable = flag->is_writeable();
1502 global->external = flag->is_external();
1503 switch (flag->get_origin()) {
1504 case Flag::DEFAULT:
1505 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1506 break;
1507 case Flag::COMMAND_LINE:
1508 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1509 break;
1510 case Flag::ENVIRON_VAR:
1511 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1512 break;
1513 case Flag::CONFIG_FILE:
1514 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1515 break;
1516 case Flag::MANAGEMENT:
1517 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1518 break;
1519 case Flag::ERGONOMIC:
1520 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1521 break;
1522 case Flag::ATTACH_ON_DEMAND:
1523 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1524 break;
1525 default:
1526 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1527 }
1528
1529 return true;
1530 }
1531
1532 // Fill globals array of count length with jmmVMGlobal entries
1533 // specified by names. If names == NULL, fill globals array
1534 // with all Flags. Return value is number of entries
1535 // created in globals.
1536 // If a Flag with a given name in an array element does not
1537 // exist, globals[i].name will be set to NULL.
1538 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1539 jobjectArray names,
1540 jmmVMGlobal *globals,
1541 jint count))
1542
1543
1544 if (globals == NULL) {
1545 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1546 }
1547
1548 ResourceMark rm(THREAD);
1549
1550 if (names != NULL) {
1551 // return the requested globals
1552 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1553 objArrayHandle names_ah(THREAD, ta);
1554 // Make sure we have a String array
1555 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1556 if (element_klass != SystemDictionary::String_klass()) {
1557 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1558 "Array element type is not String class", 0);
1559 }
1560
1561 int names_length = names_ah->length();
1562 int num_entries = 0;
1563 for (int i = 0; i < names_length && i < count; i++) {
1564 oop s = names_ah->obj_at(i);
1565 if (s == NULL) {
1566 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1567 }
1568
1569 Handle sh(THREAD, s);
1570 char* str = java_lang_String::as_utf8_string(s);
1571 Flag* flag = Flag::find_flag(str, strlen(str));
1572 if (flag != NULL &&
1573 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1574 num_entries++;
1575 } else {
1576 globals[i].name = NULL;
1577 }
1578 }
1579 return num_entries;
1580 } else {
1581 // return all globals if names == NULL
1582
1583 // last flag entry is always NULL, so subtract 1
1584 int nFlags = (int) Flag::numFlags - 1;
1585 Handle null_h;
1586 int num_entries = 0;
1587 for (int i = 0; i < nFlags && num_entries < count; i++) {
1588 Flag* flag = &Flag::flags[i];
1589 // Exclude notproduct and develop flags in product builds.
1590 if (flag->is_constant_in_binary()) {
1591 continue;
1592 }
1593 // Exclude the locked (diagnostic, experimental) flags
1594 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1595 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1596 num_entries++;
1597 }
1598 }
1599 return num_entries;
1600 }
1601 JVM_END
1602
1603 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1604 ResourceMark rm(THREAD);
1605
1606 oop fn = JNIHandles::resolve_external_guard(flag_name);
1607 if (fn == NULL) {
1608 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1609 "The flag name cannot be null.");
1610 }
1611 char* name = java_lang_String::as_utf8_string(fn);
1612
1613 FormatBuffer<80> error_msg("%s", "");
1614 int succeed = WriteableFlags::set_flag(name, new_value, Flag::MANAGEMENT, error_msg);
1615
1616 if (succeed != Flag::SUCCESS) {
1617 if (succeed == Flag::MISSING_VALUE) {
1618 // missing value causes NPE to be thrown
1619 THROW(vmSymbols::java_lang_NullPointerException());
1620 } else {
1621 // all the other errors are reported as IAE with the appropriate error message
1622 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1623 error_msg.buffer());
1624 }
1625 }
1626 assert(succeed == Flag::SUCCESS, "Setting flag should succeed");
1627 JVM_END
1628
1629 class ThreadTimesClosure: public ThreadClosure {
1630 private:
1631 objArrayHandle _names_strings;
1632 char **_names_chars;
1633 typeArrayHandle _times;
1634 int _names_len;
1635 int _times_len;
1636 int _count;
1637
1638 public:
1639 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1640 ~ThreadTimesClosure();
1641 virtual void do_thread(Thread* thread);
1642 void do_unlocked();
1643 int count() { return _count; }
1644 };
1645
1646 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1647 typeArrayHandle times) {
1648 assert(names() != NULL, "names was NULL");
1649 assert(times() != NULL, "times was NULL");
1650 _names_strings = names;
1651 _names_len = names->length();
1652 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1653 _times = times;
1654 _times_len = times->length();
1655 _count = 0;
1656 }
1657
1658 //
1659 // Called with Threads_lock held
1660 //
1661 void ThreadTimesClosure::do_thread(Thread* thread) {
1662 assert(thread != NULL, "thread was NULL");
1663
1664 // exclude externally visible JavaThreads
1665 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1666 return;
1667 }
1668
1669 if (_count >= _names_len || _count >= _times_len) {
1670 // skip if the result array is not big enough
1671 return;
1672 }
1673
1674 EXCEPTION_MARK;
1675 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1676
1677 assert(thread->name() != NULL, "All threads should have a name");
1678 _names_chars[_count] = os::strdup(thread->name());
1679 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1680 os::thread_cpu_time(thread) : -1);
1681 _count++;
1682 }
1683
1684 // Called without Threads_lock, we can allocate String objects.
1685 void ThreadTimesClosure::do_unlocked() {
1686
1687 EXCEPTION_MARK;
1688 for (int i = 0; i < _count; i++) {
1689 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1690 _names_strings->obj_at_put(i, s());
1691 }
1692 }
1693
1694 ThreadTimesClosure::~ThreadTimesClosure() {
1695 for (int i = 0; i < _count; i++) {
1696 os::free(_names_chars[i]);
1697 }
1698 FREE_C_HEAP_ARRAY(char *, _names_chars);
1699 }
1700
1701 // Fills names with VM internal thread names and times with the corresponding
1702 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1703 // If the element type of names is not String, an IllegalArgumentException is
1704 // thrown.
1705 // If an array is not large enough to hold all the entries, only the entries
1706 // that fit will be returned. Return value is the number of VM internal
1707 // threads entries.
1708 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1709 jobjectArray names,
1710 jlongArray times))
1711 if (names == NULL || times == NULL) {
1712 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1713 }
1714 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1715 objArrayHandle names_ah(THREAD, na);
1716
1717 // Make sure we have a String array
1718 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1719 if (element_klass != SystemDictionary::String_klass()) {
1720 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1721 "Array element type is not String class", 0);
1722 }
1723
1724 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1725 typeArrayHandle times_ah(THREAD, ta);
1726
1727 ThreadTimesClosure ttc(names_ah, times_ah);
1728 {
1729 MutexLockerEx ml(Threads_lock);
1730 Threads::threads_do(&ttc);
1731 }
1732 ttc.do_unlocked();
1733 return ttc.count();
1734 JVM_END
1735
1736 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1737 ResourceMark rm(THREAD);
1738
1739 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1740 VMThread::execute(&op);
1741
1742 DeadlockCycle* deadlocks = op.result();
1743 if (deadlocks == NULL) {
1744 // no deadlock found and return
1745 return Handle();
1746 }
1747
1748 int num_threads = 0;
1749 DeadlockCycle* cycle;
1750 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1751 num_threads += cycle->num_threads();
1752 }
1753
1754 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1755 objArrayHandle threads_ah(THREAD, r);
1756
1757 int index = 0;
1758 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1759 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1760 int len = deadlock_threads->length();
1761 for (int i = 0; i < len; i++) {
1762 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1763 index++;
1764 }
1765 }
1766 return threads_ah;
1767 }
1768
1769 // Finds cycles of threads that are deadlocked involved in object monitors
1770 // and JSR-166 synchronizers.
1771 // Returns an array of Thread objects which are in deadlock, if any.
1772 // Otherwise, returns NULL.
1773 //
1774 // Input parameter:
1775 // object_monitors_only - if true, only check object monitors
1776 //
1777 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1778 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1779 return (jobjectArray) JNIHandles::make_local(env, result());
1780 JVM_END
1781
1782 // Finds cycles of threads that are deadlocked on monitor locks
1783 // Returns an array of Thread objects which are in deadlock, if any.
1784 // Otherwise, returns NULL.
1785 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1786 Handle result = find_deadlocks(true, CHECK_0);
1787 return (jobjectArray) JNIHandles::make_local(env, result());
1788 JVM_END
1789
1790 // Gets the information about GC extension attributes including
1791 // the name of the attribute, its type, and a short description.
1792 //
1793 // Input parameters:
1794 // mgr - GC memory manager
1795 // info - caller allocated array of jmmExtAttributeInfo
1796 // count - number of elements of the info array
1797 //
1798 // Returns the number of GC extension attributes filled in the info array; or
1799 // -1 if info is not big enough
1800 //
1801 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1802 // All GC memory managers have 1 attribute (number of GC threads)
1803 if (count == 0) {
1804 return 0;
1805 }
1806
1807 if (info == NULL) {
1808 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1809 }
1810
1811 info[0].name = "GcThreadCount";
1812 info[0].type = 'I';
1813 info[0].description = "Number of GC threads";
1814 return 1;
1815 JVM_END
1816
1817 // verify the given array is an array of java/lang/management/MemoryUsage objects
1818 // of a given length and return the objArrayOop
1819 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1820 if (array == NULL) {
1821 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1822 }
1823
1824 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1825 objArrayHandle array_h(THREAD, oa);
1826
1827 // array must be of the given length
1828 if (length != array_h->length()) {
1829 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1830 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1831 }
1832
1833 // check if the element of array is of type MemoryUsage class
1834 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1835 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1836 if (element_klass != usage_klass) {
1837 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1838 "The element type is not MemoryUsage class", 0);
1839 }
1840
1841 return array_h();
1842 }
1843
1844 // Gets the statistics of the last GC of a given GC memory manager.
1845 // Input parameters:
1846 // obj - GarbageCollectorMXBean object
1847 // gc_stat - caller allocated jmmGCStat where:
1848 // a. before_gc_usage - array of MemoryUsage objects
1849 // b. after_gc_usage - array of MemoryUsage objects
1850 // c. gc_ext_attributes_values_size is set to the
1851 // gc_ext_attribute_values array allocated
1852 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1853 //
1854 // On return,
1855 // gc_index == 0 indicates no GC statistics available
1856 //
1857 // before_gc_usage and after_gc_usage - filled with per memory pool
1858 // before and after GC usage in the same order as the memory pools
1859 // returned by GetMemoryPools for a given GC memory manager.
1860 // num_gc_ext_attributes indicates the number of elements in
1861 // the gc_ext_attribute_values array is filled; or
1862 // -1 if the gc_ext_attributes_values array is not big enough
1863 //
1864 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1865 ResourceMark rm(THREAD);
1866
1867 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1868 THROW(vmSymbols::java_lang_NullPointerException());
1869 }
1870
1871 // Get the GCMemoryManager
1872 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1873
1874 // Make a copy of the last GC statistics
1875 // GC may occur while constructing the last GC information
1876 int num_pools = MemoryService::num_memory_pools();
1877 GCStatInfo stat(num_pools);
1878 if (mgr->get_last_gc_stat(&stat) == 0) {
1879 gc_stat->gc_index = 0;
1880 return;
1881 }
1882
1883 gc_stat->gc_index = stat.gc_index();
1884 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1885 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1886
1887 // Current implementation does not have GC extension attributes
1888 gc_stat->num_gc_ext_attributes = 0;
1889
1890 // Fill the arrays of MemoryUsage objects with before and after GC
1891 // per pool memory usage
1892 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1893 num_pools,
1894 CHECK);
1895 objArrayHandle usage_before_gc_ah(THREAD, bu);
1896
1897 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1898 num_pools,
1899 CHECK);
1900 objArrayHandle usage_after_gc_ah(THREAD, au);
1901
1902 for (int i = 0; i < num_pools; i++) {
1903 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1904 Handle after_usage;
1905
1906 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1907 if (u.max_size() == 0 && u.used() > 0) {
1908 // If max size == 0, this pool is a survivor space.
1909 // Set max size = -1 since the pools will be swapped after GC.
1910 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1911 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1912 } else {
1913 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1914 }
1915 usage_before_gc_ah->obj_at_put(i, before_usage());
1916 usage_after_gc_ah->obj_at_put(i, after_usage());
1917 }
1918
1919 if (gc_stat->gc_ext_attribute_values_size > 0) {
1920 // Current implementation only has 1 attribute (number of GC threads)
1921 // The type is 'I'
1922 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1923 }
1924 JVM_END
1925
1926 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1927 ResourceMark rm(THREAD);
1928 // Get the GCMemoryManager
1929 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1930 mgr->set_notification_enabled(enabled?true:false);
1931 JVM_END
1932
1933 // Dump heap - Returns 0 if succeeds.
1934 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1935 #if INCLUDE_SERVICES
1936 ResourceMark rm(THREAD);
1937 oop on = JNIHandles::resolve_external_guard(outputfile);
1938 if (on == NULL) {
1939 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1940 "Output file name cannot be null.", -1);
1941 }
1942 char* name = java_lang_String::as_platform_dependent_str(on, CHECK_(-1));
1943 if (name == NULL) {
1944 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1945 "Output file name cannot be null.", -1);
1946 }
1947 HeapDumper dumper(live ? true : false);
1948 if (dumper.dump(name) != 0) {
1949 const char* errmsg = dumper.error_as_C_string();
1950 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1951 }
1952 return 0;
1953 #else // INCLUDE_SERVICES
1954 return -1;
1955 #endif // INCLUDE_SERVICES
1956 JVM_END
1957
1958 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1959 ResourceMark rm(THREAD);
1960 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1961 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1962 dcmd_list->length(), CHECK_NULL);
1963 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1964 for (int i = 0; i < dcmd_list->length(); i++) {
1965 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1966 cmd_array->obj_at_put(i, cmd_name);
1967 }
1968 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1969 JVM_END
1970
1971 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1972 dcmdInfo* infoArray))
1973 if (cmds == NULL || infoArray == NULL) {
1974 THROW(vmSymbols::java_lang_NullPointerException());
1975 }
1976
1977 ResourceMark rm(THREAD);
1978
1979 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1980 objArrayHandle cmds_ah(THREAD, ca);
1981
1982 // Make sure we have a String array
1983 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1984 if (element_klass != SystemDictionary::String_klass()) {
1985 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1986 "Array element type is not String class");
1987 }
1988
1989 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1990
1991 int num_cmds = cmds_ah->length();
1992 for (int i = 0; i < num_cmds; i++) {
1993 oop cmd = cmds_ah->obj_at(i);
1994 if (cmd == NULL) {
1995 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1996 "Command name cannot be null.");
1997 }
1998 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1999 if (cmd_name == NULL) {
2000 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2001 "Command name cannot be null.");
2002 }
2003 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
2004 if (pos == -1) {
2005 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2006 "Unknown diagnostic command");
2007 }
2008 DCmdInfo* info = info_list->at(pos);
2009 infoArray[i].name = info->name();
2010 infoArray[i].description = info->description();
2011 infoArray[i].impact = info->impact();
2012 JavaPermission p = info->permission();
2013 infoArray[i].permission_class = p._class;
2014 infoArray[i].permission_name = p._name;
2015 infoArray[i].permission_action = p._action;
2016 infoArray[i].num_arguments = info->num_arguments();
2017 infoArray[i].enabled = info->is_enabled();
2018 }
2019 JVM_END
2020
2021 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2022 jstring command, dcmdArgInfo* infoArray))
2023 ResourceMark rm(THREAD);
2024 oop cmd = JNIHandles::resolve_external_guard(command);
2025 if (cmd == NULL) {
2026 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2027 "Command line cannot be null.");
2028 }
2029 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2030 if (cmd_name == NULL) {
2031 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2032 "Command line content cannot be null.");
2033 }
2034 DCmd* dcmd = NULL;
2035 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2036 strlen(cmd_name));
2037 if (factory != NULL) {
2038 dcmd = factory->create_resource_instance(NULL);
2039 }
2040 if (dcmd == NULL) {
2041 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2042 "Unknown diagnostic command");
2043 }
2044 DCmdMark mark(dcmd);
2045 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2046 if (array->length() == 0) {
2047 return;
2048 }
2049 for (int i = 0; i < array->length(); i++) {
2050 infoArray[i].name = array->at(i)->name();
2051 infoArray[i].description = array->at(i)->description();
2052 infoArray[i].type = array->at(i)->type();
2053 infoArray[i].default_string = array->at(i)->default_string();
2054 infoArray[i].mandatory = array->at(i)->is_mandatory();
2055 infoArray[i].option = array->at(i)->is_option();
2056 infoArray[i].multiple = array->at(i)->is_multiple();
2057 infoArray[i].position = array->at(i)->position();
2058 }
2059 return;
2060 JVM_END
2061
2062 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2063 ResourceMark rm(THREAD);
2064 oop cmd = JNIHandles::resolve_external_guard(commandline);
2065 if (cmd == NULL) {
2066 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2067 "Command line cannot be null.");
2068 }
2069 char* cmdline = java_lang_String::as_utf8_string(cmd);
2070 if (cmdline == NULL) {
2071 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2072 "Command line content cannot be null.");
2073 }
2074 bufferedStream output;
2075 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2076 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2077 return (jstring) JNIHandles::make_local(env, result);
2078 JVM_END
2079
2080 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2081 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2082 JVM_END
2083
2084 jlong Management::ticks_to_ms(jlong ticks) {
2085 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2086 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2087 * (double)1000.0);
2088 }
2089 #endif // INCLUDE_MANAGEMENT
2090
2091 // Gets an array containing the amount of memory allocated on the Java
2092 // heap for a set of threads (in bytes). Each element of the array is
2093 // the amount of memory allocated for the thread ID specified in the
2094 // corresponding entry in the given array of thread IDs; or -1 if the
2095 // thread does not exist or has terminated.
2096 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2097 jlongArray sizeArray))
2098 // Check if threads is null
2099 if (ids == NULL || sizeArray == NULL) {
2100 THROW(vmSymbols::java_lang_NullPointerException());
2101 }
2102
2103 ResourceMark rm(THREAD);
2104 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2105 typeArrayHandle ids_ah(THREAD, ta);
2106
2107 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2108 typeArrayHandle sizeArray_h(THREAD, sa);
2109
2110 // validate the thread id array
2111 validate_thread_id_array(ids_ah, CHECK);
2112
2113 // sizeArray must be of the same length as the given array of thread IDs
2114 int num_threads = ids_ah->length();
2115 if (num_threads != sizeArray_h->length()) {
2116 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2117 "The length of the given long array does not match the length of "
2118 "the given array of thread IDs");
2119 }
2120
2121 MutexLockerEx ml(Threads_lock);
2122 for (int i = 0; i < num_threads; i++) {
2123 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2124 if (java_thread != NULL) {
2125 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2126 }
2127 }
2128 JVM_END
2129
2130 // Returns the CPU time consumed by a given thread (in nanoseconds).
2131 // If thread_id == 0, CPU time for the current thread is returned.
2132 // If user_sys_cpu_time = true, user level and system CPU time of
2133 // a given thread is returned; otherwise, only user level CPU time
2134 // is returned.
2135 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2136 if (!os::is_thread_cpu_time_supported()) {
2137 return -1;
2138 }
2139
2140 if (thread_id < 0) {
2141 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2142 "Invalid thread ID", -1);
2143 }
2144
2145 JavaThread* java_thread = NULL;
2146 if (thread_id == 0) {
2147 // current thread
2148 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2149 } else {
2150 MutexLockerEx ml(Threads_lock);
2151 java_thread = Threads::find_java_thread_from_java_tid(thread_id);
2152 if (java_thread != NULL) {
2153 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2154 }
2155 }
2156 return -1;
2157 JVM_END
2158
2159 // Gets an array containing the CPU times consumed by a set of threads
2160 // (in nanoseconds). Each element of the array is the CPU time for the
2161 // thread ID specified in the corresponding entry in the given array
2162 // of thread IDs; or -1 if the thread does not exist or has terminated.
2163 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2164 // for the given thread is returned; otherwise, only user level CPU time
2165 // is returned.
2166 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2167 jlongArray timeArray,
2168 jboolean user_sys_cpu_time))
2169 // Check if threads is null
2170 if (ids == NULL || timeArray == NULL) {
2171 THROW(vmSymbols::java_lang_NullPointerException());
2172 }
2173
2174 ResourceMark rm(THREAD);
2175 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2176 typeArrayHandle ids_ah(THREAD, ta);
2177
2178 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2179 typeArrayHandle timeArray_h(THREAD, tia);
2180
2181 // validate the thread id array
2182 validate_thread_id_array(ids_ah, CHECK);
2183
2184 // timeArray must be of the same length as the given array of thread IDs
2185 int num_threads = ids_ah->length();
2186 if (num_threads != timeArray_h->length()) {
2187 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2188 "The length of the given long array does not match the length of "
2189 "the given array of thread IDs");
2190 }
2191
2192 MutexLockerEx ml(Threads_lock);
2193 for (int i = 0; i < num_threads; i++) {
2194 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2195 if (java_thread != NULL) {
2196 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2197 user_sys_cpu_time != 0));
2198 }
2199 }
2200 JVM_END
2201
2202
2203
2204 #if INCLUDE_MANAGEMENT
2205 const struct jmmInterface_1_ jmm_interface = {
2206 NULL,
2207 NULL,
2208 jmm_GetVersion,
2209 jmm_GetOptionalSupport,
2210 jmm_GetThreadInfo,
2211 jmm_GetMemoryPools,
2212 jmm_GetMemoryManagers,
2213 jmm_GetMemoryPoolUsage,
2214 jmm_GetPeakMemoryPoolUsage,
2215 jmm_GetThreadAllocatedMemory,
2216 jmm_GetMemoryUsage,
2217 jmm_GetLongAttribute,
2218 jmm_GetBoolAttribute,
2219 jmm_SetBoolAttribute,
2220 jmm_GetLongAttributes,
2221 jmm_FindMonitorDeadlockedThreads,
2222 jmm_GetThreadCpuTime,
2223 jmm_GetVMGlobalNames,
2224 jmm_GetVMGlobals,
2225 jmm_GetInternalThreadTimes,
2226 jmm_ResetStatistic,
2227 jmm_SetPoolSensor,
2228 jmm_SetPoolThreshold,
2229 jmm_GetPoolCollectionUsage,
2230 jmm_GetGCExtAttributeInfo,
2231 jmm_GetLastGCStat,
2232 jmm_GetThreadCpuTimeWithKind,
2233 jmm_GetThreadCpuTimesWithKind,
2234 jmm_DumpHeap0,
2235 jmm_FindDeadlockedThreads,
2236 jmm_SetVMGlobal,
2237 NULL,
2238 jmm_DumpThreads,
2239 jmm_SetGCNotificationEnabled,
2240 jmm_GetDiagnosticCommands,
2241 jmm_GetDiagnosticCommandInfo,
2242 jmm_GetDiagnosticCommandArgumentsInfo,
2243 jmm_ExecuteDiagnosticCommand,
2244 jmm_SetDiagnosticFrameworkNotificationEnabled
2245 };
2246 #endif // INCLUDE_MANAGEMENT
2247
2248 void* Management::get_jmm_interface(int version) {
2249 #if INCLUDE_MANAGEMENT
2250 if (version == JMM_VERSION_1_0) {
2251 return (void*) &jmm_interface;
2252 }
2253 #endif // INCLUDE_MANAGEMENT
2254 return NULL;
2255 }