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