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