1 /*
2 * Copyright (c) 2003, 2018, 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 "jmm.h"
27 #include "classfile/systemDictionary.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/iterator.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "oops/klass.hpp"
34 #include "oops/objArrayKlass.hpp"
35 #include "oops/objArrayOop.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "oops/typeArrayOop.inline.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/flags/jvmFlag.hpp"
40 #include "runtime/globals.hpp"
41 #include "runtime/handles.inline.hpp"
42 #include "runtime/interfaceSupport.inline.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/jniHandles.inline.hpp"
45 #include "runtime/os.hpp"
46 #include "runtime/serviceThread.hpp"
47 #include "runtime/thread.inline.hpp"
48 #include "runtime/threadSMR.hpp"
49 #include "services/classLoadingService.hpp"
50 #include "services/diagnosticCommand.hpp"
51 #include "services/diagnosticFramework.hpp"
52 #include "services/writeableFlags.hpp"
53 #include "services/heapDumper.hpp"
54 #include "services/lowMemoryDetector.hpp"
55 #include "services/gcNotifier.hpp"
56 #include "services/nmtDCmd.hpp"
57 #include "services/management.hpp"
58 #include "services/memoryManager.hpp"
59 #include "services/memoryPool.hpp"
60 #include "services/memoryService.hpp"
61 #include "services/runtimeService.hpp"
62 #include "services/threadService.hpp"
63 #include "utilities/debug.hpp"
64 #include "utilities/formatBuffer.hpp"
65 #include "utilities/macros.hpp"
66
67 PerfVariable* Management::_begin_vm_creation_time = NULL;
68 PerfVariable* Management::_end_vm_creation_time = NULL;
69 PerfVariable* Management::_vm_init_done_time = NULL;
70
71 InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
72 InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
73 InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
74 InstanceKlass* Management::_gcInfo_klass = NULL;
75 InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
76 InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
77 InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
78 InstanceKlass* Management::_memoryUsage_klass = NULL;
79 InstanceKlass* Management::_sensor_klass = NULL;
80 InstanceKlass* Management::_threadInfo_klass = NULL;
81
82 jmmOptionalSupport Management::_optional_support = {0};
83 TimeStamp Management::_stamp;
84
85 void management_init() {
86 #if INCLUDE_MANAGEMENT
87 Management::init();
88 ThreadService::init();
89 RuntimeService::init();
90 ClassLoadingService::init();
91 #else
92 ThreadService::init();
93 #endif // INCLUDE_MANAGEMENT
94 }
95
96 #if INCLUDE_MANAGEMENT
97
98 void Management::init() {
99 EXCEPTION_MARK;
100
101 // These counters are for java.lang.management API support.
102 // They are created even if -XX:-UsePerfData is set and in
103 // that case, they will be allocated on C heap.
104
105 _begin_vm_creation_time =
106 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
107 PerfData::U_None, CHECK);
108
109 _end_vm_creation_time =
110 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
111 PerfData::U_None, CHECK);
112
113 _vm_init_done_time =
114 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
115 PerfData::U_None, CHECK);
116
117 // Initialize optional support
118 _optional_support.isLowMemoryDetectionSupported = 1;
119 _optional_support.isCompilationTimeMonitoringSupported = 1;
120 _optional_support.isThreadContentionMonitoringSupported = 1;
121
122 if (os::is_thread_cpu_time_supported()) {
123 _optional_support.isCurrentThreadCpuTimeSupported = 1;
124 _optional_support.isOtherThreadCpuTimeSupported = 1;
125 } else {
126 _optional_support.isCurrentThreadCpuTimeSupported = 0;
127 _optional_support.isOtherThreadCpuTimeSupported = 0;
128 }
129
130 _optional_support.isObjectMonitorUsageSupported = 1;
131 #if INCLUDE_SERVICES
132 // This depends on the heap inspector
133 _optional_support.isSynchronizerUsageSupported = 1;
134 #endif // INCLUDE_SERVICES
135 _optional_support.isThreadAllocatedMemorySupported = 1;
136 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
137
138 // Registration of the diagnostic commands
139 DCmdRegistrant::register_dcmds();
140 DCmdRegistrant::register_dcmds_ext();
141 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
142 | DCmd_Source_MBean;
143 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
144 }
145
146 void Management::initialize(TRAPS) {
147 // Start the service thread
148 ServiceThread::initialize();
149
150 if (ManagementServer) {
151 ResourceMark rm(THREAD);
152 HandleMark hm(THREAD);
153
154 // Load and initialize the jdk.internal.agent.Agent class
155 // invoke startAgent method to start the management server
156 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
157 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
158 loader,
159 Handle(),
160 THREAD);
161 if (k == NULL) {
162 vm_exit_during_initialization("Management agent initialization failure: "
163 "class jdk.internal.agent.Agent not found.");
164 }
165
166 JavaValue result(T_VOID);
167 JavaCalls::call_static(&result,
168 k,
169 vmSymbols::startAgent_name(),
170 vmSymbols::void_method_signature(),
171 CHECK);
172 }
173 }
174
175 void Management::get_optional_support(jmmOptionalSupport* support) {
176 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
177 }
178
179 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
180 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
181 return initialize_klass(k, CHECK_NULL);
182 }
183
184 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
185 Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
186 if (k == NULL) {
187 return NULL;
188 }
189 return initialize_klass(k, CHECK_NULL);
190 }
191
192 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
193 InstanceKlass* ik = InstanceKlass::cast(k);
194 if (ik->should_be_initialized()) {
195 ik->initialize(CHECK_NULL);
196 }
197 // If these classes change to not be owned by the boot loader, they need
198 // to be walked to keep their class loader alive in oops_do.
199 assert(ik->class_loader() == NULL, "need to follow in oops_do");
200 return ik;
201 }
202
203 void Management::record_vm_startup_time(jlong begin, jlong duration) {
204 // if the performance counter is not initialized,
205 // then vm initialization failed; simply return.
206 if (_begin_vm_creation_time == NULL) return;
207
208 _begin_vm_creation_time->set_value(begin);
209 _end_vm_creation_time->set_value(begin + duration);
210 PerfMemory::set_accessible(true);
211 }
212
213 jlong Management::timestamp() {
214 TimeStamp t;
215 t.update();
216 return t.ticks() - _stamp.ticks();
217 }
218
219 void Management::oops_do(OopClosure* f) {
220 MemoryService::oops_do(f);
221 ThreadService::oops_do(f);
222 }
223
224 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
225 if (_threadInfo_klass == NULL) {
226 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
227 }
228 return _threadInfo_klass;
229 }
230
231 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
232 if (_memoryUsage_klass == NULL) {
233 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
234 }
235 return _memoryUsage_klass;
236 }
237
238 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
239 if (_memoryPoolMXBean_klass == NULL) {
240 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
241 }
242 return _memoryPoolMXBean_klass;
243 }
244
245 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
246 if (_memoryManagerMXBean_klass == NULL) {
247 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
248 }
249 return _memoryManagerMXBean_klass;
250 }
251
252 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
253 if (_garbageCollectorMXBean_klass == NULL) {
254 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
255 }
256 return _garbageCollectorMXBean_klass;
257 }
258
259 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
260 if (_sensor_klass == NULL) {
261 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
262 }
263 return _sensor_klass;
264 }
265
266 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
267 if (_managementFactoryHelper_klass == NULL) {
268 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
269 }
270 return _managementFactoryHelper_klass;
271 }
272
273 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
274 if (_garbageCollectorExtImpl_klass == NULL) {
275 _garbageCollectorExtImpl_klass =
276 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
277 }
278 return _garbageCollectorExtImpl_klass;
279 }
280
281 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
282 if (_gcInfo_klass == NULL) {
283 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
284 }
285 return _gcInfo_klass;
286 }
287
288 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
289 if (_diagnosticCommandImpl_klass == NULL) {
290 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
291 }
292 return _diagnosticCommandImpl_klass;
293 }
294
295 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
296 Handle snapshot_thread(THREAD, snapshot->threadObj());
297
298 jlong contended_time;
299 jlong waited_time;
300 if (ThreadService::is_thread_monitoring_contention()) {
301 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
302 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
303 } else {
304 // set them to -1 if thread contention monitoring is disabled.
305 contended_time = max_julong;
306 waited_time = max_julong;
307 }
308
309 int thread_status = snapshot->thread_status();
310 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
311 if (snapshot->is_ext_suspended()) {
312 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
313 }
314 if (snapshot->is_in_native()) {
315 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
316 }
317
318 ThreadStackTrace* st = snapshot->get_stack_trace();
319 Handle stacktrace_h;
320 if (st != NULL) {
321 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
322 } else {
323 stacktrace_h = Handle();
324 }
325
326 args->push_oop(snapshot_thread);
327 args->push_int(thread_status);
328 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
329 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
330 args->push_long(snapshot->contended_enter_count());
331 args->push_long(contended_time);
332 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
333 args->push_long(waited_time);
334 args->push_oop(stacktrace_h);
335 }
336
337 // Helper function to construct a ThreadInfo object
338 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
339 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
340
341 JavaValue result(T_VOID);
342 JavaCallArguments args(14);
343
344 // First allocate a ThreadObj object and
345 // push the receiver as the first argument
346 Handle element = ik->allocate_instance_handle(CHECK_NULL);
347 args.push_oop(element);
348
349 // initialize the arguments for the ThreadInfo constructor
350 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
351
352 // Call ThreadInfo constructor with no locked monitors and synchronizers
353 JavaCalls::call_special(&result,
354 ik,
355 vmSymbols::object_initializer_name(),
356 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
357 &args,
358 CHECK_NULL);
359
360 return (instanceOop) element();
361 }
362
363 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
364 objArrayHandle monitors_array,
365 typeArrayHandle depths_array,
366 objArrayHandle synchronizers_array,
367 TRAPS) {
368 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
369
370 JavaValue result(T_VOID);
371 JavaCallArguments args(17);
372
373 // First allocate a ThreadObj object and
374 // push the receiver as the first argument
375 Handle element = ik->allocate_instance_handle(CHECK_NULL);
376 args.push_oop(element);
377
378 // initialize the arguments for the ThreadInfo constructor
379 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
380
381 // push the locked monitors and synchronizers in the arguments
382 args.push_oop(monitors_array);
383 args.push_oop(depths_array);
384 args.push_oop(synchronizers_array);
385
386 // Call ThreadInfo constructor with locked monitors and synchronizers
387 JavaCalls::call_special(&result,
388 ik,
389 vmSymbols::object_initializer_name(),
390 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
391 &args,
392 CHECK_NULL);
393
394 return (instanceOop) element();
395 }
396
397
398 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
399 if (mgr == NULL) {
400 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
401 }
402 oop mgr_obj = JNIHandles::resolve(mgr);
403 instanceHandle h(THREAD, (instanceOop) mgr_obj);
404
405 InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
406 if (!h->is_a(k)) {
407 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
408 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
409 NULL);
410 }
411
412 MemoryManager* gc = MemoryService::get_memory_manager(h);
413 if (gc == NULL || !gc->is_gc_memory_manager()) {
414 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
415 "Invalid GC memory manager",
416 NULL);
417 }
418 return (GCMemoryManager*) gc;
419 }
420
421 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
422 if (obj == NULL) {
423 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
424 }
425
426 oop pool_obj = JNIHandles::resolve(obj);
427 assert(pool_obj->is_instance(), "Should be an instanceOop");
428 instanceHandle ph(THREAD, (instanceOop) pool_obj);
429
430 return MemoryService::get_memory_pool(ph);
431 }
432
433 #endif // INCLUDE_MANAGEMENT
434
435 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
436 int num_threads = ids_ah->length();
437
438 // Validate input thread IDs
439 int i = 0;
440 for (i = 0; i < num_threads; i++) {
441 jlong tid = ids_ah->long_at(i);
442 if (tid <= 0) {
443 // throw exception if invalid thread id.
444 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
445 "Invalid thread ID entry");
446 }
447 }
448 }
449
450 #if INCLUDE_MANAGEMENT
451
452 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
453 // check if the element of infoArray is of type ThreadInfo class
454 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
455 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
456 if (element_klass != threadinfo_klass) {
457 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
458 "infoArray element type is not ThreadInfo class");
459 }
460 }
461
462
463 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
464 if (obj == NULL) {
465 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
466 }
467
468 oop mgr_obj = JNIHandles::resolve(obj);
469 assert(mgr_obj->is_instance(), "Should be an instanceOop");
470 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
471
472 return MemoryService::get_memory_manager(mh);
473 }
474
475 // Returns a version string and sets major and minor version if
476 // the input parameters are non-null.
477 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
478 return JMM_VERSION;
479 JVM_END
480
481 // Gets the list of VM monitoring and management optional supports
482 // Returns 0 if succeeded; otherwise returns non-zero.
483 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
484 if (support == NULL) {
485 return -1;
486 }
487 Management::get_optional_support(support);
488 return 0;
489 JVM_END
490
491 // Returns an array of java/lang/management/MemoryPoolMXBean object
492 // one for each memory pool if obj == null; otherwise returns
493 // an array of memory pools for a given memory manager if
494 // it is a valid memory manager.
495 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
496 ResourceMark rm(THREAD);
497
498 int num_memory_pools;
499 MemoryManager* mgr = NULL;
500 if (obj == NULL) {
501 num_memory_pools = MemoryService::num_memory_pools();
502 } else {
503 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
504 if (mgr == NULL) {
505 return NULL;
506 }
507 num_memory_pools = mgr->num_memory_pools();
508 }
509
510 // Allocate the resulting MemoryPoolMXBean[] object
511 InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
512 objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
513 objArrayHandle poolArray(THREAD, r);
514
515 if (mgr == NULL) {
516 // Get all memory pools
517 for (int i = 0; i < num_memory_pools; i++) {
518 MemoryPool* pool = MemoryService::get_memory_pool(i);
519 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
520 instanceHandle ph(THREAD, p);
521 poolArray->obj_at_put(i, ph());
522 }
523 } else {
524 // Get memory pools managed by a given memory manager
525 for (int i = 0; i < num_memory_pools; i++) {
526 MemoryPool* pool = mgr->get_memory_pool(i);
527 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
528 instanceHandle ph(THREAD, p);
529 poolArray->obj_at_put(i, ph());
530 }
531 }
532 return (jobjectArray) JNIHandles::make_local(env, poolArray());
533 JVM_END
534
535 // Returns an array of java/lang/management/MemoryManagerMXBean object
536 // one for each memory manager if obj == null; otherwise returns
537 // an array of memory managers for a given memory pool if
538 // it is a valid memory pool.
539 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
540 ResourceMark rm(THREAD);
541
542 int num_mgrs;
543 MemoryPool* pool = NULL;
544 if (obj == NULL) {
545 num_mgrs = MemoryService::num_memory_managers();
546 } else {
547 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
548 if (pool == NULL) {
549 return NULL;
550 }
551 num_mgrs = pool->num_memory_managers();
552 }
553
554 // Allocate the resulting MemoryManagerMXBean[] object
555 InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
556 objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
557 objArrayHandle mgrArray(THREAD, r);
558
559 if (pool == NULL) {
560 // Get all memory managers
561 for (int i = 0; i < num_mgrs; i++) {
562 MemoryManager* mgr = MemoryService::get_memory_manager(i);
563 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
564 instanceHandle ph(THREAD, p);
565 mgrArray->obj_at_put(i, ph());
566 }
567 } else {
568 // Get memory managers for a given memory pool
569 for (int i = 0; i < num_mgrs; i++) {
570 MemoryManager* mgr = pool->get_memory_manager(i);
571 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
572 instanceHandle ph(THREAD, p);
573 mgrArray->obj_at_put(i, ph());
574 }
575 }
576 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
577 JVM_END
578
579
580 // Returns a java/lang/management/MemoryUsage object containing the memory usage
581 // of a given memory pool.
582 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
583 ResourceMark rm(THREAD);
584
585 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
586 if (pool != NULL) {
587 MemoryUsage usage = pool->get_memory_usage();
588 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
589 return JNIHandles::make_local(env, h());
590 } else {
591 return NULL;
592 }
593 JVM_END
594
595 // Returns a java/lang/management/MemoryUsage object containing the memory usage
596 // of a given memory pool.
597 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
598 ResourceMark rm(THREAD);
599
600 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
601 if (pool != NULL) {
602 MemoryUsage usage = pool->get_peak_memory_usage();
603 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
604 return JNIHandles::make_local(env, h());
605 } else {
606 return NULL;
607 }
608 JVM_END
609
610 // Returns a java/lang/management/MemoryUsage object containing the memory usage
611 // of a given memory pool after most recent GC.
612 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
613 ResourceMark rm(THREAD);
614
615 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
616 if (pool != NULL && pool->is_collected_pool()) {
617 MemoryUsage usage = pool->get_last_collection_usage();
618 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
619 return JNIHandles::make_local(env, h());
620 } else {
621 return NULL;
622 }
623 JVM_END
624
625 // Sets the memory pool sensor for a threshold type
626 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
627 if (obj == NULL || sensorObj == NULL) {
628 THROW(vmSymbols::java_lang_NullPointerException());
629 }
630
631 InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
632 oop s = JNIHandles::resolve(sensorObj);
633 assert(s->is_instance(), "Sensor should be an instanceOop");
634 instanceHandle sensor_h(THREAD, (instanceOop) s);
635 if (!sensor_h->is_a(sensor_klass)) {
636 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
637 "Sensor is not an instance of sun.management.Sensor class");
638 }
639
640 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
641 assert(mpool != NULL, "MemoryPool should exist");
642
643 switch (type) {
644 case JMM_USAGE_THRESHOLD_HIGH:
645 case JMM_USAGE_THRESHOLD_LOW:
646 // have only one sensor for threshold high and low
647 mpool->set_usage_sensor_obj(sensor_h);
648 break;
649 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
650 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
651 // have only one sensor for threshold high and low
652 mpool->set_gc_usage_sensor_obj(sensor_h);
653 break;
654 default:
655 assert(false, "Unrecognized type");
656 }
657
658 JVM_END
659
660
661 // Sets the threshold of a given memory pool.
662 // Returns the previous threshold.
663 //
664 // Input parameters:
665 // pool - the MemoryPoolMXBean object
666 // type - threshold type
667 // threshold - the new threshold (must not be negative)
668 //
669 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
670 if (threshold < 0) {
671 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
672 "Invalid threshold value",
673 -1);
674 }
675
676 if ((size_t)threshold > max_uintx) {
677 stringStream st;
678 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
679 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
680 }
681
682 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
683 assert(pool != NULL, "MemoryPool should exist");
684
685 jlong prev = 0;
686 switch (type) {
687 case JMM_USAGE_THRESHOLD_HIGH:
688 if (!pool->usage_threshold()->is_high_threshold_supported()) {
689 return -1;
690 }
691 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
692 break;
693
694 case JMM_USAGE_THRESHOLD_LOW:
695 if (!pool->usage_threshold()->is_low_threshold_supported()) {
696 return -1;
697 }
698 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
699 break;
700
701 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
702 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
703 return -1;
704 }
705 // return and the new threshold is effective for the next GC
706 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
707
708 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
709 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
710 return -1;
711 }
712 // return and the new threshold is effective for the next GC
713 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
714
715 default:
716 assert(false, "Unrecognized type");
717 return -1;
718 }
719
720 // When the threshold is changed, reevaluate if the low memory
721 // detection is enabled.
722 if (prev != threshold) {
723 LowMemoryDetector::recompute_enabled_for_collected_pools();
724 LowMemoryDetector::detect_low_memory(pool);
725 }
726 return prev;
727 JVM_END
728
729 // Returns a java/lang/management/MemoryUsage object representing
730 // the memory usage for the heap or non-heap memory.
731 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
732 ResourceMark rm(THREAD);
733
734 // Calculate the memory usage
735 size_t total_init = 0;
736 size_t total_used = 0;
737 size_t total_committed = 0;
738 size_t total_max = 0;
739 bool has_undefined_init_size = false;
740 bool has_undefined_max_size = false;
741
742 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
743 MemoryPool* pool = MemoryService::get_memory_pool(i);
744 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
745 MemoryUsage u = pool->get_memory_usage();
746 total_used += u.used();
747 total_committed += u.committed();
748
749 if (u.init_size() == (size_t)-1) {
750 has_undefined_init_size = true;
751 }
752 if (!has_undefined_init_size) {
753 total_init += u.init_size();
754 }
755
756 if (u.max_size() == (size_t)-1) {
757 has_undefined_max_size = true;
758 }
759 if (!has_undefined_max_size) {
760 total_max += u.max_size();
761 }
762 }
763 }
764
765 // if any one of the memory pool has undefined init_size or max_size,
766 // set it to -1
767 if (has_undefined_init_size) {
768 total_init = (size_t)-1;
769 }
770 if (has_undefined_max_size) {
771 total_max = (size_t)-1;
772 }
773
774 MemoryUsage usage((heap ? InitialHeapSize : total_init),
775 total_used,
776 total_committed,
777 (heap ? Universe::heap()->max_capacity() : total_max));
778
779 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
780 return JNIHandles::make_local(env, obj());
781 JVM_END
782
783 // Returns the boolean value of a given attribute.
784 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
785 switch (att) {
786 case JMM_VERBOSE_GC:
787 return MemoryService::get_verbose();
788 case JMM_VERBOSE_CLASS:
789 return ClassLoadingService::get_verbose();
790 case JMM_THREAD_CONTENTION_MONITORING:
791 return ThreadService::is_thread_monitoring_contention();
792 case JMM_THREAD_CPU_TIME:
793 return ThreadService::is_thread_cpu_time_enabled();
794 case JMM_THREAD_ALLOCATED_MEMORY:
795 return ThreadService::is_thread_allocated_memory_enabled();
796 default:
797 assert(0, "Unrecognized attribute");
798 return false;
799 }
800 JVM_END
801
802 // Sets the given boolean attribute and returns the previous value.
803 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
804 switch (att) {
805 case JMM_VERBOSE_GC:
806 return MemoryService::set_verbose(flag != 0);
807 case JMM_VERBOSE_CLASS:
808 return ClassLoadingService::set_verbose(flag != 0);
809 case JMM_THREAD_CONTENTION_MONITORING:
810 return ThreadService::set_thread_monitoring_contention(flag != 0);
811 case JMM_THREAD_CPU_TIME:
812 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
813 case JMM_THREAD_ALLOCATED_MEMORY:
814 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
815 default:
816 assert(0, "Unrecognized attribute");
817 return false;
818 }
819 JVM_END
820
821
822 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
823 switch (att) {
824 case JMM_GC_TIME_MS:
825 return mgr->gc_time_ms();
826
827 case JMM_GC_COUNT:
828 return mgr->gc_count();
829
830 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
831 // current implementation only has 1 ext attribute
832 return 1;
833
834 default:
835 assert(0, "Unrecognized GC attribute");
836 return -1;
837 }
838 }
839
840 class VmThreadCountClosure: public ThreadClosure {
841 private:
842 int _count;
843 public:
844 VmThreadCountClosure() : _count(0) {};
845 void do_thread(Thread* thread);
846 int count() { return _count; }
847 };
848
849 void VmThreadCountClosure::do_thread(Thread* thread) {
850 // exclude externally visible JavaThreads
851 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
852 return;
853 }
854
855 _count++;
856 }
857
858 static jint get_vm_thread_count() {
859 VmThreadCountClosure vmtcc;
860 {
861 MutexLockerEx ml(Threads_lock);
862 Threads::threads_do(&vmtcc);
863 }
864
865 return vmtcc.count();
866 }
867
868 static jint get_num_flags() {
869 // last flag entry is always NULL, so subtract 1
870 int nFlags = (int) JVMFlag::numFlags - 1;
871 int count = 0;
872 for (int i = 0; i < nFlags; i++) {
873 JVMFlag* flag = &JVMFlag::flags[i];
874 // Exclude the locked (diagnostic, experimental) flags
875 if (flag->is_unlocked() || flag->is_unlocker()) {
876 count++;
877 }
878 }
879 return count;
880 }
881
882 static jlong get_long_attribute(jmmLongAttribute att) {
883 switch (att) {
884 case JMM_CLASS_LOADED_COUNT:
885 return ClassLoadingService::loaded_class_count();
886
887 case JMM_CLASS_UNLOADED_COUNT:
888 return ClassLoadingService::unloaded_class_count();
889
890 case JMM_THREAD_TOTAL_COUNT:
891 return ThreadService::get_total_thread_count();
892
893 case JMM_THREAD_LIVE_COUNT:
894 return ThreadService::get_live_thread_count();
895
896 case JMM_THREAD_PEAK_COUNT:
897 return ThreadService::get_peak_thread_count();
898
899 case JMM_THREAD_DAEMON_COUNT:
900 return ThreadService::get_daemon_thread_count();
901
902 case JMM_JVM_INIT_DONE_TIME_MS:
903 return Management::vm_init_done_time();
904
905 case JMM_JVM_UPTIME_MS:
906 return Management::ticks_to_ms(os::elapsed_counter());
907
908 case JMM_COMPILE_TOTAL_TIME_MS:
909 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
910
911 case JMM_OS_PROCESS_ID:
912 return os::current_process_id();
913
914 // Hotspot-specific counters
915 case JMM_CLASS_LOADED_BYTES:
916 return ClassLoadingService::loaded_class_bytes();
917
918 case JMM_CLASS_UNLOADED_BYTES:
919 return ClassLoadingService::unloaded_class_bytes();
920
921 case JMM_SHARED_CLASS_LOADED_COUNT:
922 return ClassLoadingService::loaded_shared_class_count();
923
924 case JMM_SHARED_CLASS_UNLOADED_COUNT:
925 return ClassLoadingService::unloaded_shared_class_count();
926
927
928 case JMM_SHARED_CLASS_LOADED_BYTES:
929 return ClassLoadingService::loaded_shared_class_bytes();
930
931 case JMM_SHARED_CLASS_UNLOADED_BYTES:
932 return ClassLoadingService::unloaded_shared_class_bytes();
933
934 case JMM_TOTAL_CLASSLOAD_TIME_MS:
935 return ClassLoader::classloader_time_ms();
936
937 case JMM_VM_GLOBAL_COUNT:
938 return get_num_flags();
939
940 case JMM_SAFEPOINT_COUNT:
941 return RuntimeService::safepoint_count();
942
943 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
944 return RuntimeService::safepoint_sync_time_ms();
945
946 case JMM_TOTAL_STOPPED_TIME_MS:
947 return RuntimeService::safepoint_time_ms();
948
949 case JMM_TOTAL_APP_TIME_MS:
950 return RuntimeService::application_time_ms();
951
952 case JMM_VM_THREAD_COUNT:
953 return get_vm_thread_count();
954
955 case JMM_CLASS_INIT_TOTAL_COUNT:
956 return ClassLoader::class_init_count();
957
958 case JMM_CLASS_INIT_TOTAL_TIME_MS:
959 return ClassLoader::class_init_time_ms();
960
961 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
962 return ClassLoader::class_verify_time_ms();
963
964 case JMM_METHOD_DATA_SIZE_BYTES:
965 return ClassLoadingService::class_method_data_size();
966
967 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
968 return os::physical_memory();
969
970 default:
971 return -1;
972 }
973 }
974
975
976 // Returns the long value of a given attribute.
977 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
978 if (obj == NULL) {
979 return get_long_attribute(att);
980 } else {
981 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
982 if (mgr != NULL) {
983 return get_gc_attribute(mgr, att);
984 }
985 }
986 return -1;
987 JVM_END
988
989 // Gets the value of all attributes specified in the given array
990 // and sets the value in the result array.
991 // Returns the number of attributes found.
992 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
993 jobject obj,
994 jmmLongAttribute* atts,
995 jint count,
996 jlong* result))
997
998 int num_atts = 0;
999 if (obj == NULL) {
1000 for (int i = 0; i < count; i++) {
1001 result[i] = get_long_attribute(atts[i]);
1002 if (result[i] != -1) {
1003 num_atts++;
1004 }
1005 }
1006 } else {
1007 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1008 for (int i = 0; i < count; i++) {
1009 result[i] = get_gc_attribute(mgr, atts[i]);
1010 if (result[i] != -1) {
1011 num_atts++;
1012 }
1013 }
1014 }
1015 return num_atts;
1016 JVM_END
1017
1018 // Helper function to do thread dump for a specific list of threads
1019 static void do_thread_dump(ThreadDumpResult* dump_result,
1020 typeArrayHandle ids_ah, // array of thread ID (long[])
1021 int num_threads,
1022 int max_depth,
1023 bool with_locked_monitors,
1024 bool with_locked_synchronizers,
1025 TRAPS) {
1026 // no need to actually perform thread dump if no TIDs are specified
1027 if (num_threads == 0) return;
1028
1029 // First get an array of threadObj handles.
1030 // A JavaThread may terminate before we get the stack trace.
1031 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1032
1033 {
1034 // Need this ThreadsListHandle for converting Java thread IDs into
1035 // threadObj handles; dump_result->set_t_list() is called in the
1036 // VM op below so we can't use it yet.
1037 ThreadsListHandle tlh;
1038 for (int i = 0; i < num_threads; i++) {
1039 jlong tid = ids_ah->long_at(i);
1040 JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1041 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1042 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1043 thread_handle_array->append(threadObj_h);
1044 }
1045 }
1046
1047 // Obtain thread dumps and thread snapshot information
1048 VM_ThreadDump op(dump_result,
1049 thread_handle_array,
1050 num_threads,
1051 max_depth, /* stack depth */
1052 with_locked_monitors,
1053 with_locked_synchronizers);
1054 VMThread::execute(&op);
1055 }
1056
1057 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1058 // for the thread ID specified in the corresponding entry in
1059 // the given array of thread IDs; or NULL if the thread does not exist
1060 // or has terminated.
1061 //
1062 // Input parameters:
1063 // ids - array of thread IDs
1064 // maxDepth - the maximum depth of stack traces to be dumped:
1065 // maxDepth == -1 requests to dump entire stack trace.
1066 // maxDepth == 0 requests no stack trace.
1067 // infoArray - array of ThreadInfo objects
1068 //
1069 // QQQ - Why does this method return a value instead of void?
1070 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1071 // Check if threads is null
1072 if (ids == NULL || infoArray == NULL) {
1073 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1074 }
1075
1076 if (maxDepth < -1) {
1077 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1078 "Invalid maxDepth", -1);
1079 }
1080
1081 ResourceMark rm(THREAD);
1082 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1083 typeArrayHandle ids_ah(THREAD, ta);
1084
1085 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1086 objArrayOop oa = objArrayOop(infoArray_obj);
1087 objArrayHandle infoArray_h(THREAD, oa);
1088
1089 // validate the thread id array
1090 validate_thread_id_array(ids_ah, CHECK_0);
1091
1092 // validate the ThreadInfo[] parameters
1093 validate_thread_info_array(infoArray_h, CHECK_0);
1094
1095 // infoArray must be of the same length as the given array of thread IDs
1096 int num_threads = ids_ah->length();
1097 if (num_threads != infoArray_h->length()) {
1098 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1099 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1100 }
1101
1102 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1103 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1104
1105 // Must use ThreadDumpResult to store the ThreadSnapshot.
1106 // GC may occur after the thread snapshots are taken but before
1107 // this function returns. The threadObj and other oops kept
1108 // in the ThreadSnapshot are marked and adjusted during GC.
1109 ThreadDumpResult dump_result(num_threads);
1110
1111 if (maxDepth == 0) {
1112 // No stack trace to dump so we do not need to stop the world.
1113 // Since we never do the VM op here we must set the threads list.
1114 dump_result.set_t_list();
1115 for (int i = 0; i < num_threads; i++) {
1116 jlong tid = ids_ah->long_at(i);
1117 JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1118 ThreadSnapshot* ts;
1119 if (jt == NULL) {
1120 // if the thread does not exist or now it is terminated,
1121 // create dummy snapshot
1122 ts = new ThreadSnapshot();
1123 } else {
1124 ts = new ThreadSnapshot(dump_result.t_list(), jt);
1125 }
1126 dump_result.add_thread_snapshot(ts);
1127 }
1128 } else {
1129 // obtain thread dump with the specific list of threads with stack trace
1130 do_thread_dump(&dump_result,
1131 ids_ah,
1132 num_threads,
1133 maxDepth,
1134 false, /* no locked monitor */
1135 false, /* no locked synchronizers */
1136 CHECK_0);
1137 }
1138
1139 int num_snapshots = dump_result.num_snapshots();
1140 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1141 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1142 int index = 0;
1143 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1144 // For each thread, create an java/lang/management/ThreadInfo object
1145 // and fill with the thread information
1146
1147 if (ts->threadObj() == NULL) {
1148 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1149 infoArray_h->obj_at_put(index, NULL);
1150 continue;
1151 }
1152
1153 // Create java.lang.management.ThreadInfo object
1154 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1155 infoArray_h->obj_at_put(index, info_obj);
1156 }
1157 return 0;
1158 JVM_END
1159
1160 // Dump thread info for the specified threads.
1161 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1162 // for the thread ID specified in the corresponding entry in
1163 // the given array of thread IDs; or NULL if the thread does not exist
1164 // or has terminated.
1165 //
1166 // Input parameter:
1167 // ids - array of thread IDs; NULL indicates all live threads
1168 // locked_monitors - if true, dump locked object monitors
1169 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1170 //
1171 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1172 jboolean locked_synchronizers, jint maxDepth))
1173 ResourceMark rm(THREAD);
1174
1175 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1176 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1177
1178 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1179 int num_threads = (ta != NULL ? ta->length() : 0);
1180 typeArrayHandle ids_ah(THREAD, ta);
1181
1182 ThreadDumpResult dump_result(num_threads); // can safepoint
1183
1184 if (ids_ah() != NULL) {
1185
1186 // validate the thread id array
1187 validate_thread_id_array(ids_ah, CHECK_NULL);
1188
1189 // obtain thread dump of a specific list of threads
1190 do_thread_dump(&dump_result,
1191 ids_ah,
1192 num_threads,
1193 maxDepth, /* stack depth */
1194 (locked_monitors ? true : false), /* with locked monitors */
1195 (locked_synchronizers ? true : false), /* with locked synchronizers */
1196 CHECK_NULL);
1197 } else {
1198 // obtain thread dump of all threads
1199 VM_ThreadDump op(&dump_result,
1200 maxDepth, /* stack depth */
1201 (locked_monitors ? true : false), /* with locked monitors */
1202 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1203 VMThread::execute(&op);
1204 }
1205
1206 int num_snapshots = dump_result.num_snapshots();
1207 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1208
1209 // create the result ThreadInfo[] object
1210 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1211 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1212 objArrayHandle result_h(THREAD, r);
1213
1214 int index = 0;
1215 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1216 if (ts->threadObj() == NULL) {
1217 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1218 result_h->obj_at_put(index, NULL);
1219 continue;
1220 }
1221
1222 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1223 assert(stacktrace != NULL, "Must have a stack trace dumped");
1224
1225 // Create Object[] filled with locked monitors
1226 // Create int[] filled with the stack depth where a monitor was locked
1227 int num_frames = stacktrace->get_stack_depth();
1228 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1229
1230 // Count the total number of locked monitors
1231 for (int i = 0; i < num_frames; i++) {
1232 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1233 num_locked_monitors += frame->num_locked_monitors();
1234 }
1235
1236 objArrayHandle monitors_array;
1237 typeArrayHandle depths_array;
1238 objArrayHandle synchronizers_array;
1239
1240 if (locked_monitors) {
1241 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1242 // where the thread locked it
1243 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1244 objArrayHandle mh(THREAD, array);
1245 monitors_array = mh;
1246
1247 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1248 typeArrayHandle dh(THREAD, tarray);
1249 depths_array = dh;
1250
1251 int count = 0;
1252 int j = 0;
1253 for (int depth = 0; depth < num_frames; depth++) {
1254 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1255 int len = frame->num_locked_monitors();
1256 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1257 for (j = 0; j < len; j++) {
1258 oop monitor = locked_monitors->at(j);
1259 assert(monitor != NULL, "must be a Java object");
1260 monitors_array->obj_at_put(count, monitor);
1261 depths_array->int_at_put(count, depth);
1262 count++;
1263 }
1264 }
1265
1266 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1267 for (j = 0; j < jni_locked_monitors->length(); j++) {
1268 oop object = jni_locked_monitors->at(j);
1269 assert(object != NULL, "must be a Java object");
1270 monitors_array->obj_at_put(count, object);
1271 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1272 depths_array->int_at_put(count, -1);
1273 count++;
1274 }
1275 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1276 }
1277
1278 if (locked_synchronizers) {
1279 // Create Object[] filled with locked JSR-166 synchronizers
1280 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1281 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1282 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1283 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1284
1285 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1286 objArrayHandle sh(THREAD, array);
1287 synchronizers_array = sh;
1288
1289 for (int k = 0; k < num_locked_synchronizers; k++) {
1290 synchronizers_array->obj_at_put(k, locks->at(k));
1291 }
1292 }
1293
1294 // Create java.lang.management.ThreadInfo object
1295 instanceOop info_obj = Management::create_thread_info_instance(ts,
1296 monitors_array,
1297 depths_array,
1298 synchronizers_array,
1299 CHECK_NULL);
1300 result_h->obj_at_put(index, info_obj);
1301 }
1302
1303 return (jobjectArray) JNIHandles::make_local(env, result_h());
1304 JVM_END
1305
1306 // Reset statistic. Return true if the requested statistic is reset.
1307 // Otherwise, return false.
1308 //
1309 // Input parameters:
1310 // obj - specify which instance the statistic associated with to be reset
1311 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1312 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1313 // type - the type of statistic to be reset
1314 //
1315 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1316 ResourceMark rm(THREAD);
1317
1318 switch (type) {
1319 case JMM_STAT_PEAK_THREAD_COUNT:
1320 ThreadService::reset_peak_thread_count();
1321 return true;
1322
1323 case JMM_STAT_THREAD_CONTENTION_COUNT:
1324 case JMM_STAT_THREAD_CONTENTION_TIME: {
1325 jlong tid = obj.j;
1326 if (tid < 0) {
1327 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1328 }
1329
1330 // Look for the JavaThread of this given tid
1331 JavaThreadIteratorWithHandle jtiwh;
1332 if (tid == 0) {
1333 // reset contention statistics for all threads if tid == 0
1334 for (; JavaThread *java_thread = jtiwh.next(); ) {
1335 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1336 ThreadService::reset_contention_count_stat(java_thread);
1337 } else {
1338 ThreadService::reset_contention_time_stat(java_thread);
1339 }
1340 }
1341 } else {
1342 // reset contention statistics for a given thread
1343 JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1344 if (java_thread == NULL) {
1345 return false;
1346 }
1347
1348 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1349 ThreadService::reset_contention_count_stat(java_thread);
1350 } else {
1351 ThreadService::reset_contention_time_stat(java_thread);
1352 }
1353 }
1354 return true;
1355 break;
1356 }
1357 case JMM_STAT_PEAK_POOL_USAGE: {
1358 jobject o = obj.l;
1359 if (o == NULL) {
1360 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1361 }
1362
1363 oop pool_obj = JNIHandles::resolve(o);
1364 assert(pool_obj->is_instance(), "Should be an instanceOop");
1365 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1366
1367 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1368 if (pool != NULL) {
1369 pool->reset_peak_memory_usage();
1370 return true;
1371 }
1372 break;
1373 }
1374 case JMM_STAT_GC_STAT: {
1375 jobject o = obj.l;
1376 if (o == NULL) {
1377 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1378 }
1379
1380 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1381 if (mgr != NULL) {
1382 mgr->reset_gc_stat();
1383 return true;
1384 }
1385 break;
1386 }
1387 default:
1388 assert(0, "Unknown Statistic Type");
1389 }
1390 return false;
1391 JVM_END
1392
1393 // Returns the fast estimate of CPU time consumed by
1394 // a given thread (in nanoseconds).
1395 // If thread_id == 0, return CPU time for the current thread.
1396 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1397 if (!os::is_thread_cpu_time_supported()) {
1398 return -1;
1399 }
1400
1401 if (thread_id < 0) {
1402 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1403 "Invalid thread ID", -1);
1404 }
1405
1406 JavaThread* java_thread = NULL;
1407 if (thread_id == 0) {
1408 // current thread
1409 return os::current_thread_cpu_time();
1410 } else {
1411 ThreadsListHandle tlh;
1412 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1413 if (java_thread != NULL) {
1414 return os::thread_cpu_time((Thread*) java_thread);
1415 }
1416 }
1417 return -1;
1418 JVM_END
1419
1420 // Returns a String array of all VM global flag names
1421 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1422 // last flag entry is always NULL, so subtract 1
1423 int nFlags = (int) JVMFlag::numFlags - 1;
1424 // allocate a temp array
1425 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1426 nFlags, CHECK_0);
1427 objArrayHandle flags_ah(THREAD, r);
1428 int num_entries = 0;
1429 for (int i = 0; i < nFlags; i++) {
1430 JVMFlag* flag = &JVMFlag::flags[i];
1431 // Exclude notproduct and develop flags in product builds.
1432 if (flag->is_constant_in_binary()) {
1433 continue;
1434 }
1435 // Exclude the locked (experimental, diagnostic) flags
1436 if (flag->is_unlocked() || flag->is_unlocker()) {
1437 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1438 flags_ah->obj_at_put(num_entries, s());
1439 num_entries++;
1440 }
1441 }
1442
1443 if (num_entries < nFlags) {
1444 // Return array of right length
1445 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1446 for(int i = 0; i < num_entries; i++) {
1447 res->obj_at_put(i, flags_ah->obj_at(i));
1448 }
1449 return (jobjectArray)JNIHandles::make_local(env, res);
1450 }
1451
1452 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1453 JVM_END
1454
1455 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1456 // can't be determined, true otherwise. If false is returned, then *global
1457 // will be incomplete and invalid.
1458 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {
1459 Handle flag_name;
1460 if (name() == NULL) {
1461 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1462 } else {
1463 flag_name = name;
1464 }
1465 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1466
1467 if (flag->is_bool()) {
1468 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1469 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1470 } else if (flag->is_int()) {
1471 global->value.j = (jlong)flag->get_int();
1472 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1473 } else if (flag->is_uint()) {
1474 global->value.j = (jlong)flag->get_uint();
1475 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1476 } else if (flag->is_intx()) {
1477 global->value.j = (jlong)flag->get_intx();
1478 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1479 } else if (flag->is_uintx()) {
1480 global->value.j = (jlong)flag->get_uintx();
1481 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1482 } else if (flag->is_uint64_t()) {
1483 global->value.j = (jlong)flag->get_uint64_t();
1484 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1485 } else if (flag->is_double()) {
1486 global->value.d = (jdouble)flag->get_double();
1487 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1488 } else if (flag->is_size_t()) {
1489 global->value.j = (jlong)flag->get_size_t();
1490 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1491 } else if (flag->is_ccstr()) {
1492 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1493 global->value.l = (jobject)JNIHandles::make_local(env, str());
1494 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1495 } else {
1496 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1497 return false;
1498 }
1499
1500 global->writeable = flag->is_writeable();
1501 global->external = flag->is_external();
1502 switch (flag->get_origin()) {
1503 case JVMFlag::DEFAULT:
1504 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1505 break;
1506 case JVMFlag::COMMAND_LINE:
1507 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1508 break;
1509 case JVMFlag::ENVIRON_VAR:
1510 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1511 break;
1512 case JVMFlag::CONFIG_FILE:
1513 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1514 break;
1515 case JVMFlag::MANAGEMENT:
1516 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1517 break;
1518 case JVMFlag::ERGONOMIC:
1519 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1520 break;
1521 case JVMFlag::ATTACH_ON_DEMAND:
1522 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1523 break;
1524 default:
1525 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1526 }
1527
1528 return true;
1529 }
1530
1531 // Fill globals array of count length with jmmVMGlobal entries
1532 // specified by names. If names == NULL, fill globals array
1533 // with all Flags. Return value is number of entries
1534 // created in globals.
1535 // If a JVMFlag with a given name in an array element does not
1536 // exist, globals[i].name will be set to NULL.
1537 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1538 jobjectArray names,
1539 jmmVMGlobal *globals,
1540 jint count))
1541
1542
1543 if (globals == NULL) {
1544 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1545 }
1546
1547 ResourceMark rm(THREAD);
1548
1549 if (names != NULL) {
1550 // return the requested globals
1551 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1552 objArrayHandle names_ah(THREAD, ta);
1553 // Make sure we have a String array
1554 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1555 if (element_klass != SystemDictionary::String_klass()) {
1556 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1557 "Array element type is not String class", 0);
1558 }
1559
1560 int names_length = names_ah->length();
1561 int num_entries = 0;
1562 for (int i = 0; i < names_length && i < count; i++) {
1563 oop s = names_ah->obj_at(i);
1564 if (s == NULL) {
1565 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1566 }
1567
1568 Handle sh(THREAD, s);
1569 char* str = java_lang_String::as_utf8_string(s);
1570 JVMFlag* flag = JVMFlag::find_flag(str, strlen(str));
1571 if (flag != NULL &&
1572 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1573 num_entries++;
1574 } else {
1575 globals[i].name = NULL;
1576 }
1577 }
1578 return num_entries;
1579 } else {
1580 // return all globals if names == NULL
1581
1582 // last flag entry is always NULL, so subtract 1
1583 int nFlags = (int) JVMFlag::numFlags - 1;
1584 Handle null_h;
1585 int num_entries = 0;
1586 for (int i = 0; i < nFlags && num_entries < count; i++) {
1587 JVMFlag* flag = &JVMFlag::flags[i];
1588 // Exclude notproduct and develop flags in product builds.
1589 if (flag->is_constant_in_binary()) {
1590 continue;
1591 }
1592 // Exclude the locked (diagnostic, experimental) flags
1593 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1594 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1595 num_entries++;
1596 }
1597 }
1598 return num_entries;
1599 }
1600 JVM_END
1601
1602 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1603 ResourceMark rm(THREAD);
1604
1605 oop fn = JNIHandles::resolve_external_guard(flag_name);
1606 if (fn == NULL) {
1607 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1608 "The flag name cannot be null.");
1609 }
1610 char* name = java_lang_String::as_utf8_string(fn);
1611
1612 FormatBuffer<80> error_msg("%s", "");
1613 int succeed = WriteableFlags::set_flag(name, new_value, JVMFlag::MANAGEMENT, error_msg);
1614
1615 if (succeed != JVMFlag::SUCCESS) {
1616 if (succeed == JVMFlag::MISSING_VALUE) {
1617 // missing value causes NPE to be thrown
1618 THROW(vmSymbols::java_lang_NullPointerException());
1619 } else {
1620 // all the other errors are reported as IAE with the appropriate error message
1621 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1622 error_msg.buffer());
1623 }
1624 }
1625 assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1626 JVM_END
1627
1628 class ThreadTimesClosure: public ThreadClosure {
1629 private:
1630 objArrayHandle _names_strings;
1631 char **_names_chars;
1632 typeArrayHandle _times;
1633 int _names_len;
1634 int _times_len;
1635 int _count;
1636
1637 public:
1638 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1639 ~ThreadTimesClosure();
1640 virtual void do_thread(Thread* thread);
1641 void do_unlocked();
1642 int count() { return _count; }
1643 };
1644
1645 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1646 typeArrayHandle times) {
1647 assert(names() != NULL, "names was NULL");
1648 assert(times() != NULL, "times was NULL");
1649 _names_strings = names;
1650 _names_len = names->length();
1651 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1652 _times = times;
1653 _times_len = times->length();
1654 _count = 0;
1655 }
1656
1657 //
1658 // Called with Threads_lock held
1659 //
1660 void ThreadTimesClosure::do_thread(Thread* thread) {
1661 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
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 Handle onhandle(THREAD, on);
1943 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1944 if (name == NULL) {
1945 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1946 "Output file name cannot be null.", -1);
1947 }
1948 HeapDumper dumper(live ? true : false);
1949 if (dumper.dump(name) != 0) {
1950 const char* errmsg = dumper.error_as_C_string();
1951 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1952 }
1953 return 0;
1954 #else // INCLUDE_SERVICES
1955 return -1;
1956 #endif // INCLUDE_SERVICES
1957 JVM_END
1958
1959 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1960 ResourceMark rm(THREAD);
1961 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1962 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1963 dcmd_list->length(), CHECK_NULL);
1964 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1965 for (int i = 0; i < dcmd_list->length(); i++) {
1966 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1967 cmd_array->obj_at_put(i, cmd_name);
1968 }
1969 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1970 JVM_END
1971
1972 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1973 dcmdInfo* infoArray))
1974 if (cmds == NULL || infoArray == NULL) {
1975 THROW(vmSymbols::java_lang_NullPointerException());
1976 }
1977
1978 ResourceMark rm(THREAD);
1979
1980 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1981 objArrayHandle cmds_ah(THREAD, ca);
1982
1983 // Make sure we have a String array
1984 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1985 if (element_klass != SystemDictionary::String_klass()) {
1986 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1987 "Array element type is not String class");
1988 }
1989
1990 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1991
1992 int num_cmds = cmds_ah->length();
1993 for (int i = 0; i < num_cmds; i++) {
1994 oop cmd = cmds_ah->obj_at(i);
1995 if (cmd == NULL) {
1996 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1997 "Command name cannot be null.");
1998 }
1999 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2000 if (cmd_name == NULL) {
2001 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2002 "Command name cannot be null.");
2003 }
2004 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
2005 if (pos == -1) {
2006 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2007 "Unknown diagnostic command");
2008 }
2009 DCmdInfo* info = info_list->at(pos);
2010 infoArray[i].name = info->name();
2011 infoArray[i].description = info->description();
2012 infoArray[i].impact = info->impact();
2013 JavaPermission p = info->permission();
2014 infoArray[i].permission_class = p._class;
2015 infoArray[i].permission_name = p._name;
2016 infoArray[i].permission_action = p._action;
2017 infoArray[i].num_arguments = info->num_arguments();
2018 infoArray[i].enabled = info->is_enabled();
2019 }
2020 JVM_END
2021
2022 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2023 jstring command, dcmdArgInfo* infoArray))
2024 ResourceMark rm(THREAD);
2025 oop cmd = JNIHandles::resolve_external_guard(command);
2026 if (cmd == NULL) {
2027 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2028 "Command line cannot be null.");
2029 }
2030 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2031 if (cmd_name == NULL) {
2032 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2033 "Command line content cannot be null.");
2034 }
2035 DCmd* dcmd = NULL;
2036 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2037 strlen(cmd_name));
2038 if (factory != NULL) {
2039 dcmd = factory->create_resource_instance(NULL);
2040 }
2041 if (dcmd == NULL) {
2042 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2043 "Unknown diagnostic command");
2044 }
2045 DCmdMark mark(dcmd);
2046 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2047 if (array->length() == 0) {
2048 return;
2049 }
2050 for (int i = 0; i < array->length(); i++) {
2051 infoArray[i].name = array->at(i)->name();
2052 infoArray[i].description = array->at(i)->description();
2053 infoArray[i].type = array->at(i)->type();
2054 infoArray[i].default_string = array->at(i)->default_string();
2055 infoArray[i].mandatory = array->at(i)->is_mandatory();
2056 infoArray[i].option = array->at(i)->is_option();
2057 infoArray[i].multiple = array->at(i)->is_multiple();
2058 infoArray[i].position = array->at(i)->position();
2059 }
2060 return;
2061 JVM_END
2062
2063 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2064 ResourceMark rm(THREAD);
2065 oop cmd = JNIHandles::resolve_external_guard(commandline);
2066 if (cmd == NULL) {
2067 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2068 "Command line cannot be null.");
2069 }
2070 char* cmdline = java_lang_String::as_utf8_string(cmd);
2071 if (cmdline == NULL) {
2072 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2073 "Command line content cannot be null.");
2074 }
2075 bufferedStream output;
2076 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2077 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2078 return (jstring) JNIHandles::make_local(env, result);
2079 JVM_END
2080
2081 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2082 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2083 JVM_END
2084
2085 jlong Management::ticks_to_ms(jlong ticks) {
2086 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2087 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2088 * (double)1000.0);
2089 }
2090 #endif // INCLUDE_MANAGEMENT
2091
2092 // Gets an array containing the amount of memory allocated on the Java
2093 // heap for a set of threads (in bytes). Each element of the array is
2094 // the amount of memory allocated for the thread ID specified in the
2095 // corresponding entry in the given array of thread IDs; or -1 if the
2096 // thread does not exist or has terminated.
2097 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2098 jlongArray sizeArray))
2099 // Check if threads is null
2100 if (ids == NULL || sizeArray == NULL) {
2101 THROW(vmSymbols::java_lang_NullPointerException());
2102 }
2103
2104 ResourceMark rm(THREAD);
2105 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2106 typeArrayHandle ids_ah(THREAD, ta);
2107
2108 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2109 typeArrayHandle sizeArray_h(THREAD, sa);
2110
2111 // validate the thread id array
2112 validate_thread_id_array(ids_ah, CHECK);
2113
2114 // sizeArray must be of the same length as the given array of thread IDs
2115 int num_threads = ids_ah->length();
2116 if (num_threads != sizeArray_h->length()) {
2117 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2118 "The length of the given long array does not match the length of "
2119 "the given array of thread IDs");
2120 }
2121
2122 ThreadsListHandle tlh;
2123 for (int i = 0; i < num_threads; i++) {
2124 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2125 if (java_thread != NULL) {
2126 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2127 }
2128 }
2129 JVM_END
2130
2131 // Returns the CPU time consumed by a given thread (in nanoseconds).
2132 // If thread_id == 0, CPU time for the current thread is returned.
2133 // If user_sys_cpu_time = true, user level and system CPU time of
2134 // a given thread is returned; otherwise, only user level CPU time
2135 // is returned.
2136 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2137 if (!os::is_thread_cpu_time_supported()) {
2138 return -1;
2139 }
2140
2141 if (thread_id < 0) {
2142 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2143 "Invalid thread ID", -1);
2144 }
2145
2146 JavaThread* java_thread = NULL;
2147 if (thread_id == 0) {
2148 // current thread
2149 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2150 } else {
2151 ThreadsListHandle tlh;
2152 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2153 if (java_thread != NULL) {
2154 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2155 }
2156 }
2157 return -1;
2158 JVM_END
2159
2160 // Gets an array containing the CPU times consumed by a set of threads
2161 // (in nanoseconds). Each element of the array is the CPU time for the
2162 // thread ID specified in the corresponding entry in the given array
2163 // of thread IDs; or -1 if the thread does not exist or has terminated.
2164 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2165 // for the given thread is returned; otherwise, only user level CPU time
2166 // is returned.
2167 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2168 jlongArray timeArray,
2169 jboolean user_sys_cpu_time))
2170 // Check if threads is null
2171 if (ids == NULL || timeArray == NULL) {
2172 THROW(vmSymbols::java_lang_NullPointerException());
2173 }
2174
2175 ResourceMark rm(THREAD);
2176 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2177 typeArrayHandle ids_ah(THREAD, ta);
2178
2179 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2180 typeArrayHandle timeArray_h(THREAD, tia);
2181
2182 // validate the thread id array
2183 validate_thread_id_array(ids_ah, CHECK);
2184
2185 // timeArray must be of the same length as the given array of thread IDs
2186 int num_threads = ids_ah->length();
2187 if (num_threads != timeArray_h->length()) {
2188 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2189 "The length of the given long array does not match the length of "
2190 "the given array of thread IDs");
2191 }
2192
2193 ThreadsListHandle tlh;
2194 for (int i = 0; i < num_threads; i++) {
2195 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2196 if (java_thread != NULL) {
2197 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2198 user_sys_cpu_time != 0));
2199 }
2200 }
2201 JVM_END
2202
2203
2204
2205 #if INCLUDE_MANAGEMENT
2206 const struct jmmInterface_1_ jmm_interface = {
2207 NULL,
2208 NULL,
2209 jmm_GetVersion,
2210 jmm_GetOptionalSupport,
2211 jmm_GetThreadInfo,
2212 jmm_GetMemoryPools,
2213 jmm_GetMemoryManagers,
2214 jmm_GetMemoryPoolUsage,
2215 jmm_GetPeakMemoryPoolUsage,
2216 jmm_GetThreadAllocatedMemory,
2217 jmm_GetMemoryUsage,
2218 jmm_GetLongAttribute,
2219 jmm_GetBoolAttribute,
2220 jmm_SetBoolAttribute,
2221 jmm_GetLongAttributes,
2222 jmm_FindMonitorDeadlockedThreads,
2223 jmm_GetThreadCpuTime,
2224 jmm_GetVMGlobalNames,
2225 jmm_GetVMGlobals,
2226 jmm_GetInternalThreadTimes,
2227 jmm_ResetStatistic,
2228 jmm_SetPoolSensor,
2229 jmm_SetPoolThreshold,
2230 jmm_GetPoolCollectionUsage,
2231 jmm_GetGCExtAttributeInfo,
2232 jmm_GetLastGCStat,
2233 jmm_GetThreadCpuTimeWithKind,
2234 jmm_GetThreadCpuTimesWithKind,
2235 jmm_DumpHeap0,
2236 jmm_FindDeadlockedThreads,
2237 jmm_SetVMGlobal,
2238 NULL,
2239 jmm_DumpThreads,
2240 jmm_SetGCNotificationEnabled,
2241 jmm_GetDiagnosticCommands,
2242 jmm_GetDiagnosticCommandInfo,
2243 jmm_GetDiagnosticCommandArgumentsInfo,
2244 jmm_ExecuteDiagnosticCommand,
2245 jmm_SetDiagnosticFrameworkNotificationEnabled
2246 };
2247 #endif // INCLUDE_MANAGEMENT
2248
2249 void* Management::get_jmm_interface(int version) {
2250 #if INCLUDE_MANAGEMENT
2251 if (version == JMM_VERSION) {
2252 return (void*) &jmm_interface;
2253 }
2254 #endif // INCLUDE_MANAGEMENT
2255 return NULL;
2256 }