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 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1085 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1086
1087 // Must use ThreadDumpResult to store the ThreadSnapshot.
1088 // GC may occur after the thread snapshots are taken but before
1089 // this function returns. The threadObj and other oops kept
1090 // in the ThreadSnapshot are marked and adjusted during GC.
1091 ThreadDumpResult dump_result(num_threads);
1092
1093 if (maxDepth == 0) {
1094 // No stack trace to dump so we do not need to stop the world.
1095 // Since we never do the VM op here we must set the threads list.
1096 dump_result.set_t_list();
1097 for (int i = 0; i < num_threads; i++) {
1098 jlong tid = ids_ah->long_at(i);
1099 JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1100 ThreadSnapshot* ts;
1101 if (jt == NULL) {
1102 // if the thread does not exist or now it is terminated,
1103 // create dummy snapshot
1104 ts = new ThreadSnapshot();
1105 } else {
1106 ts = new ThreadSnapshot(dump_result.t_list(), jt);
1107 }
1108 dump_result.add_thread_snapshot(ts);
1109 }
1110 } else {
1111 // obtain thread dump with the specific list of threads with stack trace
1112 do_thread_dump(&dump_result,
1113 ids_ah,
1114 num_threads,
1115 maxDepth,
1116 false, /* no locked monitor */
1117 false, /* no locked synchronizers */
1118 CHECK_0);
1119 }
1120
1121 int num_snapshots = dump_result.num_snapshots();
1122 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1123 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1124 int index = 0;
1125 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1126 // For each thread, create an java/lang/management/ThreadInfo object
1127 // and fill with the thread information
1128
1129 if (ts->threadObj() == NULL) {
1130 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1131 infoArray_h->obj_at_put(index, NULL);
1132 continue;
1133 }
1134
1135 // Create java.lang.management.ThreadInfo object
1136 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1137 infoArray_h->obj_at_put(index, info_obj);
1138 }
1139 return 0;
1140 JVM_END
1141
1142 // Dump thread info for the specified threads.
1143 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1144 // for the thread ID specified in the corresponding entry in
1145 // the given array of thread IDs; or NULL if the thread does not exist
1146 // or has terminated.
1147 //
1148 // Input parameter:
1149 // ids - array of thread IDs; NULL indicates all live threads
1150 // locked_monitors - if true, dump locked object monitors
1151 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1152 //
1153 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1154 jboolean locked_synchronizers, jint maxDepth))
1155 ResourceMark rm(THREAD);
1156
1157 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1158 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1159
1160 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1161 int num_threads = (ta != NULL ? ta->length() : 0);
1162 typeArrayHandle ids_ah(THREAD, ta);
1163
1164 ThreadDumpResult dump_result(num_threads); // can safepoint
1165
1166 if (ids_ah() != NULL) {
1167
1168 // validate the thread id array
1169 validate_thread_id_array(ids_ah, CHECK_NULL);
1170
1171 // obtain thread dump of a specific list of threads
1172 do_thread_dump(&dump_result,
1173 ids_ah,
1174 num_threads,
1175 maxDepth, /* stack depth */
1176 (locked_monitors ? true : false), /* with locked monitors */
1177 (locked_synchronizers ? true : false), /* with locked synchronizers */
1178 CHECK_NULL);
1179 } else {
1180 // obtain thread dump of all threads
1181 VM_ThreadDump op(&dump_result,
1182 maxDepth, /* stack depth */
1183 (locked_monitors ? true : false), /* with locked monitors */
1184 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1185 VMThread::execute(&op);
1186 }
1187
1188 int num_snapshots = dump_result.num_snapshots();
1189 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1190
1191 // create the result ThreadInfo[] object
1192 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1193 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1194 objArrayHandle result_h(THREAD, r);
1195
1196 int index = 0;
1197 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1198 if (ts->threadObj() == NULL) {
1199 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1200 result_h->obj_at_put(index, NULL);
1201 continue;
1202 }
1203
1204 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1205 assert(stacktrace != NULL, "Must have a stack trace dumped");
1206
1207 // Create Object[] filled with locked monitors
1208 // Create int[] filled with the stack depth where a monitor was locked
1209 int num_frames = stacktrace->get_stack_depth();
1210 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1211
1212 // Count the total number of locked monitors
1213 for (int i = 0; i < num_frames; i++) {
1214 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1215 num_locked_monitors += frame->num_locked_monitors();
1216 }
1217
1218 objArrayHandle monitors_array;
1219 typeArrayHandle depths_array;
1220 objArrayHandle synchronizers_array;
1221
1222 if (locked_monitors) {
1223 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1224 // where the thread locked it
1225 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1226 objArrayHandle mh(THREAD, array);
1227 monitors_array = mh;
1228
1229 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1230 typeArrayHandle dh(THREAD, tarray);
1231 depths_array = dh;
1232
1233 int count = 0;
1234 int j = 0;
1235 for (int depth = 0; depth < num_frames; depth++) {
1236 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1237 int len = frame->num_locked_monitors();
1238 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1239 for (j = 0; j < len; j++) {
1240 oop monitor = locked_monitors->at(j);
1241 assert(monitor != NULL, "must be a Java object");
1242 monitors_array->obj_at_put(count, monitor);
1243 depths_array->int_at_put(count, depth);
1244 count++;
1245 }
1246 }
1247
1248 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1249 for (j = 0; j < jni_locked_monitors->length(); j++) {
1250 oop object = jni_locked_monitors->at(j);
1251 assert(object != NULL, "must be a Java object");
1252 monitors_array->obj_at_put(count, object);
1253 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1254 depths_array->int_at_put(count, -1);
1255 count++;
1256 }
1257 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1258 }
1259
1260 if (locked_synchronizers) {
1261 // Create Object[] filled with locked JSR-166 synchronizers
1262 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1263 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1264 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1265 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1266
1267 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1268 objArrayHandle sh(THREAD, array);
1269 synchronizers_array = sh;
1270
1271 for (int k = 0; k < num_locked_synchronizers; k++) {
1272 synchronizers_array->obj_at_put(k, locks->at(k));
1273 }
1274 }
1275
1276 // Create java.lang.management.ThreadInfo object
1277 instanceOop info_obj = Management::create_thread_info_instance(ts,
1278 monitors_array,
1279 depths_array,
1280 synchronizers_array,
1281 CHECK_NULL);
1282 result_h->obj_at_put(index, info_obj);
1283 }
1284
1285 return (jobjectArray) JNIHandles::make_local(env, result_h());
1286 JVM_END
1287
1288 // Reset statistic. Return true if the requested statistic is reset.
1289 // Otherwise, return false.
1290 //
1291 // Input parameters:
1292 // obj - specify which instance the statistic associated with to be reset
1293 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1294 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1295 // type - the type of statistic to be reset
1296 //
1297 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1298 ResourceMark rm(THREAD);
1299
1300 switch (type) {
1301 case JMM_STAT_PEAK_THREAD_COUNT:
1302 ThreadService::reset_peak_thread_count();
1303 return true;
1304
1305 case JMM_STAT_THREAD_CONTENTION_COUNT:
1306 case JMM_STAT_THREAD_CONTENTION_TIME: {
1307 jlong tid = obj.j;
1308 if (tid < 0) {
1309 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1310 }
1311
1312 // Look for the JavaThread of this given tid
1313 JavaThreadIteratorWithHandle jtiwh;
1314 if (tid == 0) {
1315 // reset contention statistics for all threads if tid == 0
1316 for (; JavaThread *java_thread = jtiwh.next(); ) {
1317 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1318 ThreadService::reset_contention_count_stat(java_thread);
1319 } else {
1320 ThreadService::reset_contention_time_stat(java_thread);
1321 }
1322 }
1323 } else {
1324 // reset contention statistics for a given thread
1325 JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1326 if (java_thread == NULL) {
1327 return false;
1328 }
1329
1330 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1331 ThreadService::reset_contention_count_stat(java_thread);
1332 } else {
1333 ThreadService::reset_contention_time_stat(java_thread);
1334 }
1335 }
1336 return true;
1337 break;
1338 }
1339 case JMM_STAT_PEAK_POOL_USAGE: {
1340 jobject o = obj.l;
1341 if (o == NULL) {
1342 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1343 }
1344
1345 oop pool_obj = JNIHandles::resolve(o);
1346 assert(pool_obj->is_instance(), "Should be an instanceOop");
1347 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1348
1349 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1350 if (pool != NULL) {
1351 pool->reset_peak_memory_usage();
1352 return true;
1353 }
1354 break;
1355 }
1356 case JMM_STAT_GC_STAT: {
1357 jobject o = obj.l;
1358 if (o == NULL) {
1359 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1360 }
1361
1362 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1363 if (mgr != NULL) {
1364 mgr->reset_gc_stat();
1365 return true;
1366 }
1367 break;
1368 }
1369 default:
1370 assert(0, "Unknown Statistic Type");
1371 }
1372 return false;
1373 JVM_END
1374
1375 // Returns the fast estimate of CPU time consumed by
1376 // a given thread (in nanoseconds).
1377 // If thread_id == 0, return CPU time for the current thread.
1378 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1379 if (!os::is_thread_cpu_time_supported()) {
1380 return -1;
1381 }
1382
1383 if (thread_id < 0) {
1384 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1385 "Invalid thread ID", -1);
1386 }
1387
1388 JavaThread* java_thread = NULL;
1389 if (thread_id == 0) {
1390 // current thread
1391 return os::current_thread_cpu_time();
1392 } else {
1393 ThreadsListHandle tlh;
1394 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1395 if (java_thread != NULL) {
1396 return os::thread_cpu_time((Thread*) java_thread);
1397 }
1398 }
1399 return -1;
1400 JVM_END
1401
1402 // Returns a String array of all VM global flag names
1403 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1404 // last flag entry is always NULL, so subtract 1
1405 int nFlags = (int) JVMFlag::numFlags - 1;
1406 // allocate a temp array
1407 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1408 nFlags, CHECK_0);
1409 objArrayHandle flags_ah(THREAD, r);
1410 int num_entries = 0;
1411 for (int i = 0; i < nFlags; i++) {
1412 JVMFlag* flag = &JVMFlag::flags[i];
1413 // Exclude notproduct and develop flags in product builds.
1414 if (flag->is_constant_in_binary()) {
1415 continue;
1416 }
1417 // Exclude the locked (experimental, diagnostic) flags
1418 if (flag->is_unlocked() || flag->is_unlocker()) {
1419 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1420 flags_ah->obj_at_put(num_entries, s());
1421 num_entries++;
1422 }
1423 }
1424
1425 if (num_entries < nFlags) {
1426 // Return array of right length
1427 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1428 for(int i = 0; i < num_entries; i++) {
1429 res->obj_at_put(i, flags_ah->obj_at(i));
1430 }
1431 return (jobjectArray)JNIHandles::make_local(env, res);
1432 }
1433
1434 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1435 JVM_END
1436
1437 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1438 // can't be determined, true otherwise. If false is returned, then *global
1439 // will be incomplete and invalid.
1440 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {
1441 Handle flag_name;
1442 if (name() == NULL) {
1443 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1444 } else {
1445 flag_name = name;
1446 }
1447 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1448
1449 if (flag->is_bool()) {
1450 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1451 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1452 } else if (flag->is_int()) {
1453 global->value.j = (jlong)flag->get_int();
1454 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1455 } else if (flag->is_uint()) {
1456 global->value.j = (jlong)flag->get_uint();
1457 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1458 } else if (flag->is_intx()) {
1459 global->value.j = (jlong)flag->get_intx();
1460 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1461 } else if (flag->is_uintx()) {
1462 global->value.j = (jlong)flag->get_uintx();
1463 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1464 } else if (flag->is_uint64_t()) {
1465 global->value.j = (jlong)flag->get_uint64_t();
1466 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1467 } else if (flag->is_double()) {
1468 global->value.d = (jdouble)flag->get_double();
1469 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1470 } else if (flag->is_size_t()) {
1471 global->value.j = (jlong)flag->get_size_t();
1472 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1473 } else if (flag->is_ccstr()) {
1474 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1475 global->value.l = (jobject)JNIHandles::make_local(env, str());
1476 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1477 } else {
1478 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1479 return false;
1480 }
1481
1482 global->writeable = flag->is_writeable();
1483 global->external = flag->is_external();
1484 switch (flag->get_origin()) {
1485 case JVMFlag::DEFAULT:
1486 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1487 break;
1488 case JVMFlag::COMMAND_LINE:
1489 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1490 break;
1491 case JVMFlag::ENVIRON_VAR:
1492 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1493 break;
1494 case JVMFlag::CONFIG_FILE:
1495 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1496 break;
1497 case JVMFlag::MANAGEMENT:
1498 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1499 break;
1500 case JVMFlag::ERGONOMIC:
1501 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1502 break;
1503 case JVMFlag::ATTACH_ON_DEMAND:
1504 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1505 break;
1506 default:
1507 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1508 }
1509
1510 return true;
1511 }
1512
1513 // Fill globals array of count length with jmmVMGlobal entries
1514 // specified by names. If names == NULL, fill globals array
1515 // with all Flags. Return value is number of entries
1516 // created in globals.
1517 // If a JVMFlag with a given name in an array element does not
1518 // exist, globals[i].name will be set to NULL.
1519 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1520 jobjectArray names,
1521 jmmVMGlobal *globals,
1522 jint count))
1523
1524
1525 if (globals == NULL) {
1526 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1527 }
1528
1529 ResourceMark rm(THREAD);
1530
1531 if (names != NULL) {
1532 // return the requested globals
1533 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1534 objArrayHandle names_ah(THREAD, ta);
1535 // Make sure we have a String array
1536 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1537 if (element_klass != SystemDictionary::String_klass()) {
1538 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1539 "Array element type is not String class", 0);
1540 }
1541
1542 int names_length = names_ah->length();
1543 int num_entries = 0;
1544 for (int i = 0; i < names_length && i < count; i++) {
1545 oop s = names_ah->obj_at(i);
1546 if (s == NULL) {
1547 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1548 }
1549
1550 Handle sh(THREAD, s);
1551 char* str = java_lang_String::as_utf8_string(s);
1552 JVMFlag* flag = JVMFlag::find_flag(str, strlen(str));
1553 if (flag != NULL &&
1554 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1555 num_entries++;
1556 } else {
1557 globals[i].name = NULL;
1558 }
1559 }
1560 return num_entries;
1561 } else {
1562 // return all globals if names == NULL
1563
1564 // last flag entry is always NULL, so subtract 1
1565 int nFlags = (int) JVMFlag::numFlags - 1;
1566 Handle null_h;
1567 int num_entries = 0;
1568 for (int i = 0; i < nFlags && num_entries < count; i++) {
1569 JVMFlag* flag = &JVMFlag::flags[i];
1570 // Exclude notproduct and develop flags in product builds.
1571 if (flag->is_constant_in_binary()) {
1572 continue;
1573 }
1574 // Exclude the locked (diagnostic, experimental) flags
1575 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1576 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1577 num_entries++;
1578 }
1579 }
1580 return num_entries;
1581 }
1582 JVM_END
1583
1584 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1585 ResourceMark rm(THREAD);
1586
1587 oop fn = JNIHandles::resolve_external_guard(flag_name);
1588 if (fn == NULL) {
1589 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1590 "The flag name cannot be null.");
1591 }
1592 char* name = java_lang_String::as_utf8_string(fn);
1593
1594 FormatBuffer<80> error_msg("%s", "");
1595 int succeed = WriteableFlags::set_flag(name, new_value, JVMFlag::MANAGEMENT, error_msg);
1596
1597 if (succeed != JVMFlag::SUCCESS) {
1598 if (succeed == JVMFlag::MISSING_VALUE) {
1599 // missing value causes NPE to be thrown
1600 THROW(vmSymbols::java_lang_NullPointerException());
1601 } else {
1602 // all the other errors are reported as IAE with the appropriate error message
1603 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1604 error_msg.buffer());
1605 }
1606 }
1607 assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1608 JVM_END
1609
1610 class ThreadTimesClosure: public ThreadClosure {
1611 private:
1612 objArrayHandle _names_strings;
1613 char **_names_chars;
1614 typeArrayHandle _times;
1615 int _names_len;
1616 int _times_len;
1617 int _count;
1618
1619 public:
1620 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1621 ~ThreadTimesClosure();
1622 virtual void do_thread(Thread* thread);
1623 void do_unlocked();
1624 int count() { return _count; }
1625 };
1626
1627 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1628 typeArrayHandle times) {
1629 assert(names() != NULL, "names was NULL");
1630 assert(times() != NULL, "times was NULL");
1631 _names_strings = names;
1632 _names_len = names->length();
1633 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1634 _times = times;
1635 _times_len = times->length();
1636 _count = 0;
1637 }
1638
1639 //
1640 // Called with Threads_lock held
1641 //
1642 void ThreadTimesClosure::do_thread(Thread* thread) {
1643 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
1644 assert(thread != NULL, "thread was NULL");
1645
1646 // exclude externally visible JavaThreads
1647 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1648 return;
1649 }
1650
1651 if (_count >= _names_len || _count >= _times_len) {
1652 // skip if the result array is not big enough
1653 return;
1654 }
1655
1656 EXCEPTION_MARK;
1657 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1658
1659 assert(thread->name() != NULL, "All threads should have a name");
1660 _names_chars[_count] = os::strdup(thread->name());
1661 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1662 os::thread_cpu_time(thread) : -1);
1663 _count++;
1664 }
1665
1666 // Called without Threads_lock, we can allocate String objects.
1667 void ThreadTimesClosure::do_unlocked() {
1668
1669 EXCEPTION_MARK;
1670 for (int i = 0; i < _count; i++) {
1671 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1672 _names_strings->obj_at_put(i, s());
1673 }
1674 }
1675
1676 ThreadTimesClosure::~ThreadTimesClosure() {
1677 for (int i = 0; i < _count; i++) {
1678 os::free(_names_chars[i]);
1679 }
1680 FREE_C_HEAP_ARRAY(char *, _names_chars);
1681 }
1682
1683 // Fills names with VM internal thread names and times with the corresponding
1684 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1685 // If the element type of names is not String, an IllegalArgumentException is
1686 // thrown.
1687 // If an array is not large enough to hold all the entries, only the entries
1688 // that fit will be returned. Return value is the number of VM internal
1689 // threads entries.
1690 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1691 jobjectArray names,
1692 jlongArray times))
1693 if (names == NULL || times == NULL) {
1694 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1695 }
1696 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1697 objArrayHandle names_ah(THREAD, na);
1698
1699 // Make sure we have a String array
1700 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1701 if (element_klass != SystemDictionary::String_klass()) {
1702 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1703 "Array element type is not String class", 0);
1704 }
1705
1706 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1707 typeArrayHandle times_ah(THREAD, ta);
1708
1709 ThreadTimesClosure ttc(names_ah, times_ah);
1710 {
1711 MutexLockerEx ml(Threads_lock);
1712 Threads::threads_do(&ttc);
1713 }
1714 ttc.do_unlocked();
1715 return ttc.count();
1716 JVM_END
1717
1718 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1719 ResourceMark rm(THREAD);
1720
1721 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1722 VMThread::execute(&op);
1723
1724 DeadlockCycle* deadlocks = op.result();
1725 if (deadlocks == NULL) {
1726 // no deadlock found and return
1727 return Handle();
1728 }
1729
1730 int num_threads = 0;
1731 DeadlockCycle* cycle;
1732 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1733 num_threads += cycle->num_threads();
1734 }
1735
1736 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1737 objArrayHandle threads_ah(THREAD, r);
1738
1739 int index = 0;
1740 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1741 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1742 int len = deadlock_threads->length();
1743 for (int i = 0; i < len; i++) {
1744 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1745 index++;
1746 }
1747 }
1748 return threads_ah;
1749 }
1750
1751 // Finds cycles of threads that are deadlocked involved in object monitors
1752 // and JSR-166 synchronizers.
1753 // Returns an array of Thread objects which are in deadlock, if any.
1754 // Otherwise, returns NULL.
1755 //
1756 // Input parameter:
1757 // object_monitors_only - if true, only check object monitors
1758 //
1759 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1760 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1761 return (jobjectArray) JNIHandles::make_local(env, result());
1762 JVM_END
1763
1764 // Finds cycles of threads that are deadlocked on monitor locks
1765 // Returns an array of Thread objects which are in deadlock, if any.
1766 // Otherwise, returns NULL.
1767 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1768 Handle result = find_deadlocks(true, CHECK_0);
1769 return (jobjectArray) JNIHandles::make_local(env, result());
1770 JVM_END
1771
1772 // Gets the information about GC extension attributes including
1773 // the name of the attribute, its type, and a short description.
1774 //
1775 // Input parameters:
1776 // mgr - GC memory manager
1777 // info - caller allocated array of jmmExtAttributeInfo
1778 // count - number of elements of the info array
1779 //
1780 // Returns the number of GC extension attributes filled in the info array; or
1781 // -1 if info is not big enough
1782 //
1783 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1784 // All GC memory managers have 1 attribute (number of GC threads)
1785 if (count == 0) {
1786 return 0;
1787 }
1788
1789 if (info == NULL) {
1790 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1791 }
1792
1793 info[0].name = "GcThreadCount";
1794 info[0].type = 'I';
1795 info[0].description = "Number of GC threads";
1796 return 1;
1797 JVM_END
1798
1799 // verify the given array is an array of java/lang/management/MemoryUsage objects
1800 // of a given length and return the objArrayOop
1801 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1802 if (array == NULL) {
1803 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1804 }
1805
1806 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1807 objArrayHandle array_h(THREAD, oa);
1808
1809 // array must be of the given length
1810 if (length != array_h->length()) {
1811 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1812 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1813 }
1814
1815 // check if the element of array is of type MemoryUsage class
1816 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1817 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1818 if (element_klass != usage_klass) {
1819 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1820 "The element type is not MemoryUsage class", 0);
1821 }
1822
1823 return array_h();
1824 }
1825
1826 // Gets the statistics of the last GC of a given GC memory manager.
1827 // Input parameters:
1828 // obj - GarbageCollectorMXBean object
1829 // gc_stat - caller allocated jmmGCStat where:
1830 // a. before_gc_usage - array of MemoryUsage objects
1831 // b. after_gc_usage - array of MemoryUsage objects
1832 // c. gc_ext_attributes_values_size is set to the
1833 // gc_ext_attribute_values array allocated
1834 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1835 //
1836 // On return,
1837 // gc_index == 0 indicates no GC statistics available
1838 //
1839 // before_gc_usage and after_gc_usage - filled with per memory pool
1840 // before and after GC usage in the same order as the memory pools
1841 // returned by GetMemoryPools for a given GC memory manager.
1842 // num_gc_ext_attributes indicates the number of elements in
1843 // the gc_ext_attribute_values array is filled; or
1844 // -1 if the gc_ext_attributes_values array is not big enough
1845 //
1846 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1847 ResourceMark rm(THREAD);
1848
1849 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1850 THROW(vmSymbols::java_lang_NullPointerException());
1851 }
1852
1853 // Get the GCMemoryManager
1854 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1855
1856 // Make a copy of the last GC statistics
1857 // GC may occur while constructing the last GC information
1858 int num_pools = MemoryService::num_memory_pools();
1859 GCStatInfo stat(num_pools);
1860 if (mgr->get_last_gc_stat(&stat) == 0) {
1861 gc_stat->gc_index = 0;
1862 return;
1863 }
1864
1865 gc_stat->gc_index = stat.gc_index();
1866 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1867 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1868
1869 // Current implementation does not have GC extension attributes
1870 gc_stat->num_gc_ext_attributes = 0;
1871
1872 // Fill the arrays of MemoryUsage objects with before and after GC
1873 // per pool memory usage
1874 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1875 num_pools,
1876 CHECK);
1877 objArrayHandle usage_before_gc_ah(THREAD, bu);
1878
1879 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1880 num_pools,
1881 CHECK);
1882 objArrayHandle usage_after_gc_ah(THREAD, au);
1883
1884 for (int i = 0; i < num_pools; i++) {
1885 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1886 Handle after_usage;
1887
1888 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1889 if (u.max_size() == 0 && u.used() > 0) {
1890 // If max size == 0, this pool is a survivor space.
1891 // Set max size = -1 since the pools will be swapped after GC.
1892 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1893 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1894 } else {
1895 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1896 }
1897 usage_before_gc_ah->obj_at_put(i, before_usage());
1898 usage_after_gc_ah->obj_at_put(i, after_usage());
1899 }
1900
1901 if (gc_stat->gc_ext_attribute_values_size > 0) {
1902 // Current implementation only has 1 attribute (number of GC threads)
1903 // The type is 'I'
1904 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1905 }
1906 JVM_END
1907
1908 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1909 ResourceMark rm(THREAD);
1910 // Get the GCMemoryManager
1911 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1912 mgr->set_notification_enabled(enabled?true:false);
1913 JVM_END
1914
1915 // Dump heap - Returns 0 if succeeds.
1916 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1917 #if INCLUDE_SERVICES
1918 ResourceMark rm(THREAD);
1919 oop on = JNIHandles::resolve_external_guard(outputfile);
1920 if (on == NULL) {
1921 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1922 "Output file name cannot be null.", -1);
1923 }
1924 Handle onhandle(THREAD, on);
1925 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1926 if (name == NULL) {
1927 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1928 "Output file name cannot be null.", -1);
1929 }
1930 HeapDumper dumper(live ? true : false);
1931 if (dumper.dump(name) != 0) {
1932 const char* errmsg = dumper.error_as_C_string();
1933 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1934 }
1935 return 0;
1936 #else // INCLUDE_SERVICES
1937 return -1;
1938 #endif // INCLUDE_SERVICES
1939 JVM_END
1940
1941 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1942 ResourceMark rm(THREAD);
1943 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1944 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1945 dcmd_list->length(), CHECK_NULL);
1946 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1947 for (int i = 0; i < dcmd_list->length(); i++) {
1948 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1949 cmd_array->obj_at_put(i, cmd_name);
1950 }
1951 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1952 JVM_END
1953
1954 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1955 dcmdInfo* infoArray))
1956 if (cmds == NULL || infoArray == NULL) {
1957 THROW(vmSymbols::java_lang_NullPointerException());
1958 }
1959
1960 ResourceMark rm(THREAD);
1961
1962 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1963 objArrayHandle cmds_ah(THREAD, ca);
1964
1965 // Make sure we have a String array
1966 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1967 if (element_klass != SystemDictionary::String_klass()) {
1968 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1969 "Array element type is not String class");
1970 }
1971
1972 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1973
1974 int num_cmds = cmds_ah->length();
1975 for (int i = 0; i < num_cmds; i++) {
1976 oop cmd = cmds_ah->obj_at(i);
1977 if (cmd == NULL) {
1978 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1979 "Command name cannot be null.");
1980 }
1981 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1982 if (cmd_name == NULL) {
1983 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1984 "Command name cannot be null.");
1985 }
1986 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
1987 if (pos == -1) {
1988 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1989 "Unknown diagnostic command");
1990 }
1991 DCmdInfo* info = info_list->at(pos);
1992 infoArray[i].name = info->name();
1993 infoArray[i].description = info->description();
1994 infoArray[i].impact = info->impact();
1995 JavaPermission p = info->permission();
1996 infoArray[i].permission_class = p._class;
1997 infoArray[i].permission_name = p._name;
1998 infoArray[i].permission_action = p._action;
1999 infoArray[i].num_arguments = info->num_arguments();
2000 infoArray[i].enabled = info->is_enabled();
2001 }
2002 JVM_END
2003
2004 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2005 jstring command, dcmdArgInfo* infoArray))
2006 ResourceMark rm(THREAD);
2007 oop cmd = JNIHandles::resolve_external_guard(command);
2008 if (cmd == NULL) {
2009 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2010 "Command line cannot be null.");
2011 }
2012 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2013 if (cmd_name == NULL) {
2014 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2015 "Command line content cannot be null.");
2016 }
2017 DCmd* dcmd = NULL;
2018 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2019 strlen(cmd_name));
2020 if (factory != NULL) {
2021 dcmd = factory->create_resource_instance(NULL);
2022 }
2023 if (dcmd == NULL) {
2024 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2025 "Unknown diagnostic command");
2026 }
2027 DCmdMark mark(dcmd);
2028 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2029 if (array->length() == 0) {
2030 return;
2031 }
2032 for (int i = 0; i < array->length(); i++) {
2033 infoArray[i].name = array->at(i)->name();
2034 infoArray[i].description = array->at(i)->description();
2035 infoArray[i].type = array->at(i)->type();
2036 infoArray[i].default_string = array->at(i)->default_string();
2037 infoArray[i].mandatory = array->at(i)->is_mandatory();
2038 infoArray[i].option = array->at(i)->is_option();
2039 infoArray[i].multiple = array->at(i)->is_multiple();
2040 infoArray[i].position = array->at(i)->position();
2041 }
2042 return;
2043 JVM_END
2044
2045 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2046 ResourceMark rm(THREAD);
2047 oop cmd = JNIHandles::resolve_external_guard(commandline);
2048 if (cmd == NULL) {
2049 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2050 "Command line cannot be null.");
2051 }
2052 char* cmdline = java_lang_String::as_utf8_string(cmd);
2053 if (cmdline == NULL) {
2054 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2055 "Command line content cannot be null.");
2056 }
2057 bufferedStream output;
2058 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2059 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2060 return (jstring) JNIHandles::make_local(env, result);
2061 JVM_END
2062
2063 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2064 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2065 JVM_END
2066
2067 jlong Management::ticks_to_ms(jlong ticks) {
2068 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2069 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2070 * (double)1000.0);
2071 }
2072 #endif // INCLUDE_MANAGEMENT
2073
2074 // Gets an array containing the amount of memory allocated on the Java
2075 // heap for a set of threads (in bytes). Each element of the array is
2076 // the amount of memory allocated for the thread ID specified in the
2077 // corresponding entry in the given array of thread IDs; or -1 if the
2078 // thread does not exist or has terminated.
2079 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2080 jlongArray sizeArray))
2081 // Check if threads is null
2082 if (ids == NULL || sizeArray == NULL) {
2083 THROW(vmSymbols::java_lang_NullPointerException());
2084 }
2085
2086 ResourceMark rm(THREAD);
2087 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2088 typeArrayHandle ids_ah(THREAD, ta);
2089
2090 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2091 typeArrayHandle sizeArray_h(THREAD, sa);
2092
2093 // validate the thread id array
2094 validate_thread_id_array(ids_ah, CHECK);
2095
2096 // sizeArray must be of the same length as the given array of thread IDs
2097 int num_threads = ids_ah->length();
2098 if (num_threads != sizeArray_h->length()) {
2099 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2100 "The length of the given long array does not match the length of "
2101 "the given array of thread IDs");
2102 }
2103
2104 ThreadsListHandle tlh;
2105 for (int i = 0; i < num_threads; i++) {
2106 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2107 if (java_thread != NULL) {
2108 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2109 }
2110 }
2111 JVM_END
2112
2113 // Returns the CPU time consumed by a given thread (in nanoseconds).
2114 // If thread_id == 0, CPU time for the current thread is returned.
2115 // If user_sys_cpu_time = true, user level and system CPU time of
2116 // a given thread is returned; otherwise, only user level CPU time
2117 // is returned.
2118 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2119 if (!os::is_thread_cpu_time_supported()) {
2120 return -1;
2121 }
2122
2123 if (thread_id < 0) {
2124 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2125 "Invalid thread ID", -1);
2126 }
2127
2128 JavaThread* java_thread = NULL;
2129 if (thread_id == 0) {
2130 // current thread
2131 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2132 } else {
2133 ThreadsListHandle tlh;
2134 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2135 if (java_thread != NULL) {
2136 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2137 }
2138 }
2139 return -1;
2140 JVM_END
2141
2142 // Gets an array containing the CPU times consumed by a set of threads
2143 // (in nanoseconds). Each element of the array is the CPU time for the
2144 // thread ID specified in the corresponding entry in the given array
2145 // of thread IDs; or -1 if the thread does not exist or has terminated.
2146 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2147 // for the given thread is returned; otherwise, only user level CPU time
2148 // is returned.
2149 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2150 jlongArray timeArray,
2151 jboolean user_sys_cpu_time))
2152 // Check if threads is null
2153 if (ids == NULL || timeArray == NULL) {
2154 THROW(vmSymbols::java_lang_NullPointerException());
2155 }
2156
2157 ResourceMark rm(THREAD);
2158 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2159 typeArrayHandle ids_ah(THREAD, ta);
2160
2161 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2162 typeArrayHandle timeArray_h(THREAD, tia);
2163
2164 // validate the thread id array
2165 validate_thread_id_array(ids_ah, CHECK);
2166
2167 // timeArray must be of the same length as the given array of thread IDs
2168 int num_threads = ids_ah->length();
2169 if (num_threads != timeArray_h->length()) {
2170 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2171 "The length of the given long array does not match the length of "
2172 "the given array of thread IDs");
2173 }
2174
2175 ThreadsListHandle tlh;
2176 for (int i = 0; i < num_threads; i++) {
2177 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2178 if (java_thread != NULL) {
2179 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2180 user_sys_cpu_time != 0));
2181 }
2182 }
2183 JVM_END
2184
2185
2186
2187 #if INCLUDE_MANAGEMENT
2188 const struct jmmInterface_1_ jmm_interface = {
2189 NULL,
2190 NULL,
2191 jmm_GetVersion,
2192 jmm_GetOptionalSupport,
2193 jmm_GetThreadInfo,
2194 jmm_GetMemoryPools,
2195 jmm_GetMemoryManagers,
2196 jmm_GetMemoryPoolUsage,
2197 jmm_GetPeakMemoryPoolUsage,
2198 jmm_GetThreadAllocatedMemory,
2199 jmm_GetMemoryUsage,
2200 jmm_GetLongAttribute,
2201 jmm_GetBoolAttribute,
2202 jmm_SetBoolAttribute,
2203 jmm_GetLongAttributes,
2204 jmm_FindMonitorDeadlockedThreads,
2205 jmm_GetThreadCpuTime,
2206 jmm_GetVMGlobalNames,
2207 jmm_GetVMGlobals,
2208 jmm_GetInternalThreadTimes,
2209 jmm_ResetStatistic,
2210 jmm_SetPoolSensor,
2211 jmm_SetPoolThreshold,
2212 jmm_GetPoolCollectionUsage,
2213 jmm_GetGCExtAttributeInfo,
2214 jmm_GetLastGCStat,
2215 jmm_GetThreadCpuTimeWithKind,
2216 jmm_GetThreadCpuTimesWithKind,
2217 jmm_DumpHeap0,
2218 jmm_FindDeadlockedThreads,
2219 jmm_SetVMGlobal,
2220 NULL,
2221 jmm_DumpThreads,
2222 jmm_SetGCNotificationEnabled,
2223 jmm_GetDiagnosticCommands,
2224 jmm_GetDiagnosticCommandInfo,
2225 jmm_GetDiagnosticCommandArgumentsInfo,
2226 jmm_ExecuteDiagnosticCommand,
2227 jmm_SetDiagnosticFrameworkNotificationEnabled
2228 };
2229 #endif // INCLUDE_MANAGEMENT
2230
2231 void* Management::get_jmm_interface(int version) {
2232 #if INCLUDE_MANAGEMENT
2233 if (version == JMM_VERSION) {
2234 return (void*) &jmm_interface;
2235 }
2236 #endif // INCLUDE_MANAGEMENT
2237 return NULL;
2238 }
--- EOF ---