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