1 /*
2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "memory/iterator.hpp"
29 #include "memory/oopFactory.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/klass.hpp"
32 #include "oops/klassOop.hpp"
33 #include "oops/objArrayKlass.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/interfaceSupport.hpp"
38 #include "runtime/javaCalls.hpp"
39 #include "runtime/jniHandles.hpp"
40 #include "runtime/os.hpp"
41 #include "runtime/serviceThread.hpp"
42 #include "services/classLoadingService.hpp"
43 #include "services/heapDumper.hpp"
44 #include "services/lowMemoryDetector.hpp"
45 #include "services/gcNotifier.hpp"
46 #include "services/management.hpp"
47 #include "services/memoryManager.hpp"
48 #include "services/memoryPool.hpp"
49 #include "services/memoryService.hpp"
50 #include "services/runtimeService.hpp"
51 #include "services/threadService.hpp"
52
53 PerfVariable* Management::_begin_vm_creation_time = NULL;
54 PerfVariable* Management::_end_vm_creation_time = NULL;
55 PerfVariable* Management::_vm_init_done_time = NULL;
56
57 klassOop Management::_sensor_klass = NULL;
58 klassOop Management::_threadInfo_klass = NULL;
59 klassOop Management::_memoryUsage_klass = NULL;
60 klassOop Management::_memoryPoolMXBean_klass = NULL;
61 klassOop Management::_memoryManagerMXBean_klass = NULL;
62 klassOop Management::_garbageCollectorMXBean_klass = NULL;
63 klassOop Management::_managementFactory_klass = NULL;
64 klassOop Management::_garbageCollectorImpl_klass = NULL;
65 klassOop Management::_gcInfo_klass = NULL;
66
67 jmmOptionalSupport Management::_optional_support = {0};
68 TimeStamp Management::_stamp;
69
70 void management_init() {
71 Management::init();
72 ThreadService::init();
73 RuntimeService::init();
74 ClassLoadingService::init();
75 }
76
77 void Management::init() {
78 EXCEPTION_MARK;
79
80 // These counters are for java.lang.management API support.
81 // They are created even if -XX:-UsePerfData is set and in
82 // that case, they will be allocated on C heap.
83
84 _begin_vm_creation_time =
85 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
86 PerfData::U_None, CHECK);
87
88 _end_vm_creation_time =
89 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
90 PerfData::U_None, CHECK);
91
92 _vm_init_done_time =
93 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
94 PerfData::U_None, CHECK);
95
96 // Initialize optional support
97 _optional_support.isLowMemoryDetectionSupported = 1;
98 _optional_support.isCompilationTimeMonitoringSupported = 1;
99 _optional_support.isThreadContentionMonitoringSupported = 1;
100
101 if (os::is_thread_cpu_time_supported()) {
102 _optional_support.isCurrentThreadCpuTimeSupported = 1;
103 _optional_support.isOtherThreadCpuTimeSupported = 1;
104 } else {
105 _optional_support.isCurrentThreadCpuTimeSupported = 0;
106 _optional_support.isOtherThreadCpuTimeSupported = 0;
107 }
108
109 _optional_support.isBootClassPathSupported = 1;
110 _optional_support.isObjectMonitorUsageSupported = 1;
111 #ifndef SERVICES_KERNEL
112 // This depends on the heap inspector
113 _optional_support.isSynchronizerUsageSupported = 1;
114 #endif // SERVICES_KERNEL
115 _optional_support.isThreadAllocatedMemorySupported = 1;
116 }
117
118 void Management::initialize(TRAPS) {
119 // Start the service thread
120 ServiceThread::initialize();
121
122 if (ManagementServer) {
123 ResourceMark rm(THREAD);
124 HandleMark hm(THREAD);
125
126 // Load and initialize the sun.management.Agent class
127 // invoke startAgent method to start the management server
128 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
129 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::sun_management_Agent(),
130 loader,
131 Handle(),
132 true,
133 CHECK);
134 instanceKlassHandle ik (THREAD, k);
135
136 JavaValue result(T_VOID);
137 JavaCalls::call_static(&result,
138 ik,
139 vmSymbols::startAgent_name(),
140 vmSymbols::void_method_signature(),
141 CHECK);
142 }
143 }
144
145 void Management::get_optional_support(jmmOptionalSupport* support) {
146 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
147 }
148
149 klassOop Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
150 klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
151 instanceKlassHandle ik (THREAD, k);
152 if (ik->should_be_initialized()) {
153 ik->initialize(CHECK_NULL);
154 }
155 return ik();
156 }
157
158 void Management::record_vm_startup_time(jlong begin, jlong duration) {
159 // if the performance counter is not initialized,
160 // then vm initialization failed; simply return.
161 if (_begin_vm_creation_time == NULL) return;
162
163 _begin_vm_creation_time->set_value(begin);
164 _end_vm_creation_time->set_value(begin + duration);
165 PerfMemory::set_accessible(true);
166 }
167
168 jlong Management::timestamp() {
169 TimeStamp t;
170 t.update();
171 return t.ticks() - _stamp.ticks();
172 }
173
174 void Management::oops_do(OopClosure* f) {
175 MemoryService::oops_do(f);
176 ThreadService::oops_do(f);
177
178 f->do_oop((oop*) &_sensor_klass);
179 f->do_oop((oop*) &_threadInfo_klass);
180 f->do_oop((oop*) &_memoryUsage_klass);
181 f->do_oop((oop*) &_memoryPoolMXBean_klass);
182 f->do_oop((oop*) &_memoryManagerMXBean_klass);
183 f->do_oop((oop*) &_garbageCollectorMXBean_klass);
184 f->do_oop((oop*) &_managementFactory_klass);
185 f->do_oop((oop*) &_garbageCollectorImpl_klass);
186 f->do_oop((oop*) &_gcInfo_klass);
187 }
188
189 klassOop Management::java_lang_management_ThreadInfo_klass(TRAPS) {
190 if (_threadInfo_klass == NULL) {
191 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
192 }
193 return _threadInfo_klass;
194 }
195
196 klassOop Management::java_lang_management_MemoryUsage_klass(TRAPS) {
197 if (_memoryUsage_klass == NULL) {
198 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
199 }
200 return _memoryUsage_klass;
201 }
202
203 klassOop Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
204 if (_memoryPoolMXBean_klass == NULL) {
205 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
206 }
207 return _memoryPoolMXBean_klass;
208 }
209
210 klassOop Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
211 if (_memoryManagerMXBean_klass == NULL) {
212 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
213 }
214 return _memoryManagerMXBean_klass;
215 }
216
217 klassOop Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
218 if (_garbageCollectorMXBean_klass == NULL) {
219 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
220 }
221 return _garbageCollectorMXBean_klass;
222 }
223
224 klassOop Management::sun_management_Sensor_klass(TRAPS) {
225 if (_sensor_klass == NULL) {
226 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
227 }
228 return _sensor_klass;
229 }
230
231 klassOop Management::sun_management_ManagementFactory_klass(TRAPS) {
232 if (_managementFactory_klass == NULL) {
233 _managementFactory_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactory(), CHECK_NULL);
234 }
235 return _managementFactory_klass;
236 }
237
238 klassOop Management::sun_management_GarbageCollectorImpl_klass(TRAPS) {
239 if (_garbageCollectorImpl_klass == NULL) {
240 _garbageCollectorImpl_klass = load_and_initialize_klass(vmSymbols::sun_management_GarbageCollectorImpl(), CHECK_NULL);
241 }
242 return _garbageCollectorImpl_klass;
243 }
244
245 klassOop Management::com_sun_management_GcInfo_klass(TRAPS) {
246 if (_gcInfo_klass == NULL) {
247 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
248 }
249 return _gcInfo_klass;
250 }
251
252 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
253 Handle snapshot_thread(THREAD, snapshot->threadObj());
254
255 jlong contended_time;
256 jlong waited_time;
257 if (ThreadService::is_thread_monitoring_contention()) {
258 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
259 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
260 } else {
261 // set them to -1 if thread contention monitoring is disabled.
262 contended_time = max_julong;
263 waited_time = max_julong;
264 }
265
266 int thread_status = snapshot->thread_status();
267 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
268 if (snapshot->is_ext_suspended()) {
269 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
270 }
271 if (snapshot->is_in_native()) {
272 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
273 }
274
275 ThreadStackTrace* st = snapshot->get_stack_trace();
276 Handle stacktrace_h;
277 if (st != NULL) {
278 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
279 } else {
280 stacktrace_h = Handle();
281 }
282
283 args->push_oop(snapshot_thread);
284 args->push_int(thread_status);
285 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
286 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
287 args->push_long(snapshot->contended_enter_count());
288 args->push_long(contended_time);
289 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
290 args->push_long(waited_time);
291 args->push_oop(stacktrace_h);
292 }
293
294 // Helper function to construct a ThreadInfo object
295 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
296 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
297 instanceKlassHandle ik (THREAD, k);
298
299 JavaValue result(T_VOID);
300 JavaCallArguments args(14);
301
302 // First allocate a ThreadObj object and
303 // push the receiver as the first argument
304 Handle element = ik->allocate_instance_handle(CHECK_NULL);
305 args.push_oop(element);
306
307 // initialize the arguments for the ThreadInfo constructor
308 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
309
310 // Call ThreadInfo constructor with no locked monitors and synchronizers
311 JavaCalls::call_special(&result,
312 ik,
313 vmSymbols::object_initializer_name(),
314 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
315 &args,
316 CHECK_NULL);
317
318 return (instanceOop) element();
319 }
320
321 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
322 objArrayHandle monitors_array,
323 typeArrayHandle depths_array,
324 objArrayHandle synchronizers_array,
325 TRAPS) {
326 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
327 instanceKlassHandle ik (THREAD, k);
328
329 JavaValue result(T_VOID);
330 JavaCallArguments args(17);
331
332 // First allocate a ThreadObj object and
333 // push the receiver as the first argument
334 Handle element = ik->allocate_instance_handle(CHECK_NULL);
335 args.push_oop(element);
336
337 // initialize the arguments for the ThreadInfo constructor
338 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
339
340 // push the locked monitors and synchronizers in the arguments
341 args.push_oop(monitors_array);
342 args.push_oop(depths_array);
343 args.push_oop(synchronizers_array);
344
345 // Call ThreadInfo constructor with locked monitors and synchronizers
346 JavaCalls::call_special(&result,
347 ik,
348 vmSymbols::object_initializer_name(),
349 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
350 &args,
351 CHECK_NULL);
352
353 return (instanceOop) element();
354 }
355
356 // Helper functions
357 static JavaThread* find_java_thread_from_id(jlong thread_id) {
358 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
359
360 JavaThread* java_thread = NULL;
361 // Sequential search for now. Need to do better optimization later.
362 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
363 oop tobj = thread->threadObj();
364 if (!thread->is_exiting() &&
365 tobj != NULL &&
366 thread_id == java_lang_Thread::thread_id(tobj)) {
367 java_thread = thread;
368 break;
369 }
370 }
371 return java_thread;
372 }
373
374 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
375 if (mgr == NULL) {
376 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
377 }
378 oop mgr_obj = JNIHandles::resolve(mgr);
379 instanceHandle h(THREAD, (instanceOop) mgr_obj);
380
381 klassOop k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
382 if (!h->is_a(k)) {
383 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
384 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
385 NULL);
386 }
387
388 MemoryManager* gc = MemoryService::get_memory_manager(h);
389 if (gc == NULL || !gc->is_gc_memory_manager()) {
390 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
391 "Invalid GC memory manager",
392 NULL);
393 }
394 return (GCMemoryManager*) gc;
395 }
396
397 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
398 if (obj == NULL) {
399 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
400 }
401
402 oop pool_obj = JNIHandles::resolve(obj);
403 assert(pool_obj->is_instance(), "Should be an instanceOop");
404 instanceHandle ph(THREAD, (instanceOop) pool_obj);
405
406 return MemoryService::get_memory_pool(ph);
407 }
408
409 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
410 int num_threads = ids_ah->length();
411
412 // Validate input thread IDs
413 int i = 0;
414 for (i = 0; i < num_threads; i++) {
415 jlong tid = ids_ah->long_at(i);
416 if (tid <= 0) {
417 // throw exception if invalid thread id.
418 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
419 "Invalid thread ID entry");
420 }
421 }
422 }
423
424 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
425 // check if the element of infoArray is of type ThreadInfo class
426 klassOop threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
427 klassOop element_klass = objArrayKlass::cast(infoArray_h->klass())->element_klass();
428 if (element_klass != threadinfo_klass) {
429 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
430 "infoArray element type is not ThreadInfo class");
431 }
432 }
433
434
435 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
436 if (obj == NULL) {
437 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
438 }
439
440 oop mgr_obj = JNIHandles::resolve(obj);
441 assert(mgr_obj->is_instance(), "Should be an instanceOop");
442 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
443
444 return MemoryService::get_memory_manager(mh);
445 }
446
447 // Returns a version string and sets major and minor version if
448 // the input parameters are non-null.
449 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
450 return JMM_VERSION;
451 JVM_END
452
453 // Gets the list of VM monitoring and management optional supports
454 // Returns 0 if succeeded; otherwise returns non-zero.
455 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
456 if (support == NULL) {
457 return -1;
458 }
459 Management::get_optional_support(support);
460 return 0;
461 JVM_END
462
463 // Returns a java.lang.String object containing the input arguments to the VM.
464 JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env))
465 ResourceMark rm(THREAD);
466
467 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
468 return NULL;
469 }
470
471 char** vm_flags = Arguments::jvm_flags_array();
472 char** vm_args = Arguments::jvm_args_array();
473 int num_flags = Arguments::num_jvm_flags();
474 int num_args = Arguments::num_jvm_args();
475
476 size_t length = 1; // null terminator
477 int i;
478 for (i = 0; i < num_flags; i++) {
479 length += strlen(vm_flags[i]);
480 }
481 for (i = 0; i < num_args; i++) {
482 length += strlen(vm_args[i]);
483 }
484 // add a space between each argument
485 length += num_flags + num_args - 1;
486
487 // Return the list of input arguments passed to the VM
488 // and preserve the order that the VM processes.
489 char* args = NEW_RESOURCE_ARRAY(char, length);
490 args[0] = '\0';
491 // concatenate all jvm_flags
492 if (num_flags > 0) {
493 strcat(args, vm_flags[0]);
494 for (i = 1; i < num_flags; i++) {
495 strcat(args, " ");
496 strcat(args, vm_flags[i]);
497 }
498 }
499
500 if (num_args > 0 && num_flags > 0) {
501 // append a space if args already contains one or more jvm_flags
502 strcat(args, " ");
503 }
504
505 // concatenate all jvm_args
506 if (num_args > 0) {
507 strcat(args, vm_args[0]);
508 for (i = 1; i < num_args; i++) {
509 strcat(args, " ");
510 strcat(args, vm_args[i]);
511 }
512 }
513
514 Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL);
515 return JNIHandles::make_local(env, hargs());
516 JVM_END
517
518 // Returns an array of java.lang.String object containing the input arguments to the VM.
519 JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env))
520 ResourceMark rm(THREAD);
521
522 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
523 return NULL;
524 }
525
526 char** vm_flags = Arguments::jvm_flags_array();
527 char** vm_args = Arguments::jvm_args_array();
528 int num_flags = Arguments::num_jvm_flags();
529 int num_args = Arguments::num_jvm_args();
530
531 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
532 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
533 objArrayHandle result_h(THREAD, r);
534
535 int index = 0;
536 for (int j = 0; j < num_flags; j++, index++) {
537 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
538 result_h->obj_at_put(index, h());
539 }
540 for (int i = 0; i < num_args; i++, index++) {
541 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
542 result_h->obj_at_put(index, h());
543 }
544 return (jobjectArray) JNIHandles::make_local(env, result_h());
545 JVM_END
546
547 // Returns an array of java/lang/management/MemoryPoolMXBean object
548 // one for each memory pool if obj == null; otherwise returns
549 // an array of memory pools for a given memory manager if
550 // it is a valid memory manager.
551 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
552 ResourceMark rm(THREAD);
553
554 int num_memory_pools;
555 MemoryManager* mgr = NULL;
556 if (obj == NULL) {
557 num_memory_pools = MemoryService::num_memory_pools();
558 } else {
559 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
560 if (mgr == NULL) {
561 return NULL;
562 }
563 num_memory_pools = mgr->num_memory_pools();
564 }
565
566 // Allocate the resulting MemoryPoolMXBean[] object
567 klassOop k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
568 instanceKlassHandle ik (THREAD, k);
569 objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
570 objArrayHandle poolArray(THREAD, r);
571
572 if (mgr == NULL) {
573 // Get all memory pools
574 for (int i = 0; i < num_memory_pools; i++) {
575 MemoryPool* pool = MemoryService::get_memory_pool(i);
576 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
577 instanceHandle ph(THREAD, p);
578 poolArray->obj_at_put(i, ph());
579 }
580 } else {
581 // Get memory pools managed by a given memory manager
582 for (int i = 0; i < num_memory_pools; i++) {
583 MemoryPool* pool = mgr->get_memory_pool(i);
584 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
585 instanceHandle ph(THREAD, p);
586 poolArray->obj_at_put(i, ph());
587 }
588 }
589 return (jobjectArray) JNIHandles::make_local(env, poolArray());
590 JVM_END
591
592 // Returns an array of java/lang/management/MemoryManagerMXBean object
593 // one for each memory manager if obj == null; otherwise returns
594 // an array of memory managers for a given memory pool if
595 // it is a valid memory pool.
596 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
597 ResourceMark rm(THREAD);
598
599 int num_mgrs;
600 MemoryPool* pool = NULL;
601 if (obj == NULL) {
602 num_mgrs = MemoryService::num_memory_managers();
603 } else {
604 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
605 if (pool == NULL) {
606 return NULL;
607 }
608 num_mgrs = pool->num_memory_managers();
609 }
610
611 // Allocate the resulting MemoryManagerMXBean[] object
612 klassOop k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
613 instanceKlassHandle ik (THREAD, k);
614 objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
615 objArrayHandle mgrArray(THREAD, r);
616
617 if (pool == NULL) {
618 // Get all memory managers
619 for (int i = 0; i < num_mgrs; i++) {
620 MemoryManager* mgr = MemoryService::get_memory_manager(i);
621 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
622 instanceHandle ph(THREAD, p);
623 mgrArray->obj_at_put(i, ph());
624 }
625 } else {
626 // Get memory managers for a given memory pool
627 for (int i = 0; i < num_mgrs; i++) {
628 MemoryManager* mgr = pool->get_memory_manager(i);
629 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
630 instanceHandle ph(THREAD, p);
631 mgrArray->obj_at_put(i, ph());
632 }
633 }
634 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
635 JVM_END
636
637
638 // Returns a java/lang/management/MemoryUsage object containing the memory usage
639 // of a given memory pool.
640 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
641 ResourceMark rm(THREAD);
642
643 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
644 if (pool != NULL) {
645 MemoryUsage usage = pool->get_memory_usage();
646 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
647 return JNIHandles::make_local(env, h());
648 } else {
649 return NULL;
650 }
651 JVM_END
652
653 // Returns a java/lang/management/MemoryUsage object containing the memory usage
654 // of a given memory pool.
655 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
656 ResourceMark rm(THREAD);
657
658 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
659 if (pool != NULL) {
660 MemoryUsage usage = pool->get_peak_memory_usage();
661 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
662 return JNIHandles::make_local(env, h());
663 } else {
664 return NULL;
665 }
666 JVM_END
667
668 // Returns a java/lang/management/MemoryUsage object containing the memory usage
669 // of a given memory pool after most recent GC.
670 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
671 ResourceMark rm(THREAD);
672
673 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
674 if (pool != NULL && pool->is_collected_pool()) {
675 MemoryUsage usage = pool->get_last_collection_usage();
676 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
677 return JNIHandles::make_local(env, h());
678 } else {
679 return NULL;
680 }
681 JVM_END
682
683 // Sets the memory pool sensor for a threshold type
684 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
685 if (obj == NULL || sensorObj == NULL) {
686 THROW(vmSymbols::java_lang_NullPointerException());
687 }
688
689 klassOop sensor_klass = Management::sun_management_Sensor_klass(CHECK);
690 oop s = JNIHandles::resolve(sensorObj);
691 assert(s->is_instance(), "Sensor should be an instanceOop");
692 instanceHandle sensor_h(THREAD, (instanceOop) s);
693 if (!sensor_h->is_a(sensor_klass)) {
694 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
695 "Sensor is not an instance of sun.management.Sensor class");
696 }
697
698 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
699 assert(mpool != NULL, "MemoryPool should exist");
700
701 switch (type) {
702 case JMM_USAGE_THRESHOLD_HIGH:
703 case JMM_USAGE_THRESHOLD_LOW:
704 // have only one sensor for threshold high and low
705 mpool->set_usage_sensor_obj(sensor_h);
706 break;
707 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
708 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
709 // have only one sensor for threshold high and low
710 mpool->set_gc_usage_sensor_obj(sensor_h);
711 break;
712 default:
713 assert(false, "Unrecognized type");
714 }
715
716 JVM_END
717
718
719 // Sets the threshold of a given memory pool.
720 // Returns the previous threshold.
721 //
722 // Input parameters:
723 // pool - the MemoryPoolMXBean object
724 // type - threshold type
725 // threshold - the new threshold (must not be negative)
726 //
727 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
728 if (threshold < 0) {
729 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
730 "Invalid threshold value",
731 -1);
732 }
733
734 if ((size_t)threshold > max_uintx) {
735 stringStream st;
736 st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx);
737 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
738 }
739
740 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
741 assert(pool != NULL, "MemoryPool should exist");
742
743 jlong prev = 0;
744 switch (type) {
745 case JMM_USAGE_THRESHOLD_HIGH:
746 if (!pool->usage_threshold()->is_high_threshold_supported()) {
747 return -1;
748 }
749 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
750 break;
751
752 case JMM_USAGE_THRESHOLD_LOW:
753 if (!pool->usage_threshold()->is_low_threshold_supported()) {
754 return -1;
755 }
756 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
757 break;
758
759 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
760 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
761 return -1;
762 }
763 // return and the new threshold is effective for the next GC
764 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
765
766 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
767 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
768 return -1;
769 }
770 // return and the new threshold is effective for the next GC
771 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
772
773 default:
774 assert(false, "Unrecognized type");
775 return -1;
776 }
777
778 // When the threshold is changed, reevaluate if the low memory
779 // detection is enabled.
780 if (prev != threshold) {
781 LowMemoryDetector::recompute_enabled_for_collected_pools();
782 LowMemoryDetector::detect_low_memory(pool);
783 }
784 return prev;
785 JVM_END
786
787 // Gets an array containing the amount of memory allocated on the Java
788 // heap for a set of threads (in bytes). Each element of the array is
789 // the amount of memory allocated for the thread ID specified in the
790 // corresponding entry in the given array of thread IDs; or -1 if the
791 // thread does not exist or has terminated.
792 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
793 jlongArray sizeArray))
794 // Check if threads is null
795 if (ids == NULL || sizeArray == NULL) {
796 THROW(vmSymbols::java_lang_NullPointerException());
797 }
798
799 ResourceMark rm(THREAD);
800 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
801 typeArrayHandle ids_ah(THREAD, ta);
802
803 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
804 typeArrayHandle sizeArray_h(THREAD, sa);
805
806 // validate the thread id array
807 validate_thread_id_array(ids_ah, CHECK);
808
809 // sizeArray must be of the same length as the given array of thread IDs
810 int num_threads = ids_ah->length();
811 if (num_threads != sizeArray_h->length()) {
812 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
813 "The length of the given long array does not match the length of "
814 "the given array of thread IDs");
815 }
816
817 MutexLockerEx ml(Threads_lock);
818 for (int i = 0; i < num_threads; i++) {
819 JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
820 if (java_thread != NULL) {
821 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
822 }
823 }
824 JVM_END
825
826 // Returns a java/lang/management/MemoryUsage object representing
827 // the memory usage for the heap or non-heap memory.
828 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
829 ResourceMark rm(THREAD);
830
831 // Calculate the memory usage
832 size_t total_init = 0;
833 size_t total_used = 0;
834 size_t total_committed = 0;
835 size_t total_max = 0;
836 bool has_undefined_init_size = false;
837 bool has_undefined_max_size = false;
838
839 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
840 MemoryPool* pool = MemoryService::get_memory_pool(i);
841 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
842 MemoryUsage u = pool->get_memory_usage();
843 total_used += u.used();
844 total_committed += u.committed();
845
846 // if any one of the memory pool has undefined init_size or max_size,
847 // set it to -1
848 if (u.init_size() == (size_t)-1) {
849 has_undefined_init_size = true;
850 }
851 if (!has_undefined_init_size) {
852 total_init += u.init_size();
853 }
854
855 if (u.max_size() == (size_t)-1) {
856 has_undefined_max_size = true;
857 }
858 if (!has_undefined_max_size) {
859 total_max += u.max_size();
860 }
861 }
862 }
863
864 // In our current implementation, we make sure that all non-heap
865 // pools have defined init and max sizes. Heap pools do not matter,
866 // as we never use total_init and total_max for them.
867 assert(heap || !has_undefined_init_size, "Undefined init size");
868 assert(heap || !has_undefined_max_size, "Undefined max size");
869
870 MemoryUsage usage((heap ? InitialHeapSize : total_init),
871 total_used,
872 total_committed,
873 (heap ? Universe::heap()->max_capacity() : total_max));
874
875 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
876 return JNIHandles::make_local(env, obj());
877 JVM_END
878
879 // Returns the boolean value of a given attribute.
880 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
881 switch (att) {
882 case JMM_VERBOSE_GC:
883 return MemoryService::get_verbose();
884 case JMM_VERBOSE_CLASS:
885 return ClassLoadingService::get_verbose();
886 case JMM_THREAD_CONTENTION_MONITORING:
887 return ThreadService::is_thread_monitoring_contention();
888 case JMM_THREAD_CPU_TIME:
889 return ThreadService::is_thread_cpu_time_enabled();
890 case JMM_THREAD_ALLOCATED_MEMORY:
891 return ThreadService::is_thread_allocated_memory_enabled();
892 default:
893 assert(0, "Unrecognized attribute");
894 return false;
895 }
896 JVM_END
897
898 // Sets the given boolean attribute and returns the previous value.
899 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
900 switch (att) {
901 case JMM_VERBOSE_GC:
902 return MemoryService::set_verbose(flag != 0);
903 case JMM_VERBOSE_CLASS:
904 return ClassLoadingService::set_verbose(flag != 0);
905 case JMM_THREAD_CONTENTION_MONITORING:
906 return ThreadService::set_thread_monitoring_contention(flag != 0);
907 case JMM_THREAD_CPU_TIME:
908 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
909 case JMM_THREAD_ALLOCATED_MEMORY:
910 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
911 default:
912 assert(0, "Unrecognized attribute");
913 return false;
914 }
915 JVM_END
916
917
918 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
919 switch (att) {
920 case JMM_GC_TIME_MS:
921 return mgr->gc_time_ms();
922
923 case JMM_GC_COUNT:
924 return mgr->gc_count();
925
926 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
927 // current implementation only has 1 ext attribute
928 return 1;
929
930 default:
931 assert(0, "Unrecognized GC attribute");
932 return -1;
933 }
934 }
935
936 class VmThreadCountClosure: public ThreadClosure {
937 private:
938 int _count;
939 public:
940 VmThreadCountClosure() : _count(0) {};
941 void do_thread(Thread* thread);
942 int count() { return _count; }
943 };
944
945 void VmThreadCountClosure::do_thread(Thread* thread) {
946 // exclude externally visible JavaThreads
947 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
948 return;
949 }
950
951 _count++;
952 }
953
954 static jint get_vm_thread_count() {
955 VmThreadCountClosure vmtcc;
956 {
957 MutexLockerEx ml(Threads_lock);
958 Threads::threads_do(&vmtcc);
959 }
960
961 return vmtcc.count();
962 }
963
964 static jint get_num_flags() {
965 // last flag entry is always NULL, so subtract 1
966 int nFlags = (int) Flag::numFlags - 1;
967 int count = 0;
968 for (int i = 0; i < nFlags; i++) {
969 Flag* flag = &Flag::flags[i];
970 // Exclude the locked (diagnostic, experimental) flags
971 if (flag->is_unlocked() || flag->is_unlocker()) {
972 count++;
973 }
974 }
975 return count;
976 }
977
978 static jlong get_long_attribute(jmmLongAttribute att) {
979 switch (att) {
980 case JMM_CLASS_LOADED_COUNT:
981 return ClassLoadingService::loaded_class_count();
982
983 case JMM_CLASS_UNLOADED_COUNT:
984 return ClassLoadingService::unloaded_class_count();
985
986 case JMM_THREAD_TOTAL_COUNT:
987 return ThreadService::get_total_thread_count();
988
989 case JMM_THREAD_LIVE_COUNT:
990 return ThreadService::get_live_thread_count();
991
992 case JMM_THREAD_PEAK_COUNT:
993 return ThreadService::get_peak_thread_count();
994
995 case JMM_THREAD_DAEMON_COUNT:
996 return ThreadService::get_daemon_thread_count();
997
998 case JMM_JVM_INIT_DONE_TIME_MS:
999 return Management::vm_init_done_time();
1000
1001 case JMM_COMPILE_TOTAL_TIME_MS:
1002 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
1003
1004 case JMM_OS_PROCESS_ID:
1005 return os::current_process_id();
1006
1007 // Hotspot-specific counters
1008 case JMM_CLASS_LOADED_BYTES:
1009 return ClassLoadingService::loaded_class_bytes();
1010
1011 case JMM_CLASS_UNLOADED_BYTES:
1012 return ClassLoadingService::unloaded_class_bytes();
1013
1014 case JMM_SHARED_CLASS_LOADED_COUNT:
1015 return ClassLoadingService::loaded_shared_class_count();
1016
1017 case JMM_SHARED_CLASS_UNLOADED_COUNT:
1018 return ClassLoadingService::unloaded_shared_class_count();
1019
1020
1021 case JMM_SHARED_CLASS_LOADED_BYTES:
1022 return ClassLoadingService::loaded_shared_class_bytes();
1023
1024 case JMM_SHARED_CLASS_UNLOADED_BYTES:
1025 return ClassLoadingService::unloaded_shared_class_bytes();
1026
1027 case JMM_TOTAL_CLASSLOAD_TIME_MS:
1028 return ClassLoader::classloader_time_ms();
1029
1030 case JMM_VM_GLOBAL_COUNT:
1031 return get_num_flags();
1032
1033 case JMM_SAFEPOINT_COUNT:
1034 return RuntimeService::safepoint_count();
1035
1036 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
1037 return RuntimeService::safepoint_sync_time_ms();
1038
1039 case JMM_TOTAL_STOPPED_TIME_MS:
1040 return RuntimeService::safepoint_time_ms();
1041
1042 case JMM_TOTAL_APP_TIME_MS:
1043 return RuntimeService::application_time_ms();
1044
1045 case JMM_VM_THREAD_COUNT:
1046 return get_vm_thread_count();
1047
1048 case JMM_CLASS_INIT_TOTAL_COUNT:
1049 return ClassLoader::class_init_count();
1050
1051 case JMM_CLASS_INIT_TOTAL_TIME_MS:
1052 return ClassLoader::class_init_time_ms();
1053
1054 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
1055 return ClassLoader::class_verify_time_ms();
1056
1057 case JMM_METHOD_DATA_SIZE_BYTES:
1058 return ClassLoadingService::class_method_data_size();
1059
1060 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
1061 return os::physical_memory();
1062
1063 default:
1064 return -1;
1065 }
1066 }
1067
1068
1069 // Returns the long value of a given attribute.
1070 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
1071 if (obj == NULL) {
1072 return get_long_attribute(att);
1073 } else {
1074 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
1075 if (mgr != NULL) {
1076 return get_gc_attribute(mgr, att);
1077 }
1078 }
1079 return -1;
1080 JVM_END
1081
1082 // Gets the value of all attributes specified in the given array
1083 // and sets the value in the result array.
1084 // Returns the number of attributes found.
1085 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
1086 jobject obj,
1087 jmmLongAttribute* atts,
1088 jint count,
1089 jlong* result))
1090
1091 int num_atts = 0;
1092 if (obj == NULL) {
1093 for (int i = 0; i < count; i++) {
1094 result[i] = get_long_attribute(atts[i]);
1095 if (result[i] != -1) {
1096 num_atts++;
1097 }
1098 }
1099 } else {
1100 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1101 for (int i = 0; i < count; i++) {
1102 result[i] = get_gc_attribute(mgr, atts[i]);
1103 if (result[i] != -1) {
1104 num_atts++;
1105 }
1106 }
1107 }
1108 return num_atts;
1109 JVM_END
1110
1111 // Helper function to do thread dump for a specific list of threads
1112 static void do_thread_dump(ThreadDumpResult* dump_result,
1113 typeArrayHandle ids_ah, // array of thread ID (long[])
1114 int num_threads,
1115 int max_depth,
1116 bool with_locked_monitors,
1117 bool with_locked_synchronizers,
1118 TRAPS) {
1119
1120 // First get an array of threadObj handles.
1121 // A JavaThread may terminate before we get the stack trace.
1122 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1123 {
1124 MutexLockerEx ml(Threads_lock);
1125 for (int i = 0; i < num_threads; i++) {
1126 jlong tid = ids_ah->long_at(i);
1127 JavaThread* jt = find_java_thread_from_id(tid);
1128 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1129 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1130 thread_handle_array->append(threadObj_h);
1131 }
1132 }
1133
1134 // Obtain thread dumps and thread snapshot information
1135 VM_ThreadDump op(dump_result,
1136 thread_handle_array,
1137 num_threads,
1138 max_depth, /* stack depth */
1139 with_locked_monitors,
1140 with_locked_synchronizers);
1141 VMThread::execute(&op);
1142 }
1143
1144 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1145 // for the thread ID specified in the corresponding entry in
1146 // the given array of thread IDs; or NULL if the thread does not exist
1147 // or has terminated.
1148 //
1149 // Input parameters:
1150 // ids - array of thread IDs
1151 // maxDepth - the maximum depth of stack traces to be dumped:
1152 // maxDepth == -1 requests to dump entire stack trace.
1153 // maxDepth == 0 requests no stack trace.
1154 // infoArray - array of ThreadInfo objects
1155 //
1156 // QQQ - Why does this method return a value instead of void?
1157 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1158 // Check if threads is null
1159 if (ids == NULL || infoArray == NULL) {
1160 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1161 }
1162
1163 if (maxDepth < -1) {
1164 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1165 "Invalid maxDepth", -1);
1166 }
1167
1168 ResourceMark rm(THREAD);
1169 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1170 typeArrayHandle ids_ah(THREAD, ta);
1171
1172 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1173 objArrayOop oa = objArrayOop(infoArray_obj);
1174 objArrayHandle infoArray_h(THREAD, oa);
1175
1176 // validate the thread id array
1177 validate_thread_id_array(ids_ah, CHECK_0);
1178
1179 // validate the ThreadInfo[] parameters
1180 validate_thread_info_array(infoArray_h, CHECK_0);
1181
1182 // infoArray must be of the same length as the given array of thread IDs
1183 int num_threads = ids_ah->length();
1184 if (num_threads != infoArray_h->length()) {
1185 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1186 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1187 }
1188
1189 if (JDK_Version::is_gte_jdk16x_version()) {
1190 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1191 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1192 }
1193
1194 // Must use ThreadDumpResult to store the ThreadSnapshot.
1195 // GC may occur after the thread snapshots are taken but before
1196 // this function returns. The threadObj and other oops kept
1197 // in the ThreadSnapshot are marked and adjusted during GC.
1198 ThreadDumpResult dump_result(num_threads);
1199
1200 if (maxDepth == 0) {
1201 // no stack trace dumped - do not need to stop the world
1202 {
1203 MutexLockerEx ml(Threads_lock);
1204 for (int i = 0; i < num_threads; i++) {
1205 jlong tid = ids_ah->long_at(i);
1206 JavaThread* jt = find_java_thread_from_id(tid);
1207 ThreadSnapshot* ts;
1208 if (jt == NULL) {
1209 // if the thread does not exist or now it is terminated,
1210 // create dummy snapshot
1211 ts = new ThreadSnapshot();
1212 } else {
1213 ts = new ThreadSnapshot(jt);
1214 }
1215 dump_result.add_thread_snapshot(ts);
1216 }
1217 }
1218 } else {
1219 // obtain thread dump with the specific list of threads with stack trace
1220 do_thread_dump(&dump_result,
1221 ids_ah,
1222 num_threads,
1223 maxDepth,
1224 false, /* no locked monitor */
1225 false, /* no locked synchronizers */
1226 CHECK_0);
1227 }
1228
1229 int num_snapshots = dump_result.num_snapshots();
1230 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1231 int index = 0;
1232 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1233 // For each thread, create an java/lang/management/ThreadInfo object
1234 // and fill with the thread information
1235
1236 if (ts->threadObj() == NULL) {
1237 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1238 infoArray_h->obj_at_put(index, NULL);
1239 continue;
1240 }
1241
1242 // Create java.lang.management.ThreadInfo object
1243 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1244 infoArray_h->obj_at_put(index, info_obj);
1245 }
1246 return 0;
1247 JVM_END
1248
1249 // Dump thread info for the specified threads.
1250 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1251 // for the thread ID specified in the corresponding entry in
1252 // the given array of thread IDs; or NULL if the thread does not exist
1253 // or has terminated.
1254 //
1255 // Input parameter:
1256 // ids - array of thread IDs; NULL indicates all live threads
1257 // locked_monitors - if true, dump locked object monitors
1258 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1259 //
1260 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1261 ResourceMark rm(THREAD);
1262
1263 if (JDK_Version::is_gte_jdk16x_version()) {
1264 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1265 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1266 }
1267
1268 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1269 int num_threads = (ta != NULL ? ta->length() : 0);
1270 typeArrayHandle ids_ah(THREAD, ta);
1271
1272 ThreadDumpResult dump_result(num_threads); // can safepoint
1273
1274 if (ids_ah() != NULL) {
1275
1276 // validate the thread id array
1277 validate_thread_id_array(ids_ah, CHECK_NULL);
1278
1279 // obtain thread dump of a specific list of threads
1280 do_thread_dump(&dump_result,
1281 ids_ah,
1282 num_threads,
1283 -1, /* entire stack */
1284 (locked_monitors ? true : false), /* with locked monitors */
1285 (locked_synchronizers ? true : false), /* with locked synchronizers */
1286 CHECK_NULL);
1287 } else {
1288 // obtain thread dump of all threads
1289 VM_ThreadDump op(&dump_result,
1290 -1, /* entire stack */
1291 (locked_monitors ? true : false), /* with locked monitors */
1292 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1293 VMThread::execute(&op);
1294 }
1295
1296 int num_snapshots = dump_result.num_snapshots();
1297
1298 // create the result ThreadInfo[] object
1299 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1300 instanceKlassHandle ik (THREAD, k);
1301 objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
1302 objArrayHandle result_h(THREAD, r);
1303
1304 int index = 0;
1305 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1306 if (ts->threadObj() == NULL) {
1307 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1308 result_h->obj_at_put(index, NULL);
1309 continue;
1310 }
1311
1312 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1313 assert(stacktrace != NULL, "Must have a stack trace dumped");
1314
1315 // Create Object[] filled with locked monitors
1316 // Create int[] filled with the stack depth where a monitor was locked
1317 int num_frames = stacktrace->get_stack_depth();
1318 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1319
1320 // Count the total number of locked monitors
1321 for (int i = 0; i < num_frames; i++) {
1322 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1323 num_locked_monitors += frame->num_locked_monitors();
1324 }
1325
1326 objArrayHandle monitors_array;
1327 typeArrayHandle depths_array;
1328 objArrayHandle synchronizers_array;
1329
1330 if (locked_monitors) {
1331 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1332 // where the thread locked it
1333 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1334 objArrayHandle mh(THREAD, array);
1335 monitors_array = mh;
1336
1337 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1338 typeArrayHandle dh(THREAD, tarray);
1339 depths_array = dh;
1340
1341 int count = 0;
1342 int j = 0;
1343 for (int depth = 0; depth < num_frames; depth++) {
1344 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1345 int len = frame->num_locked_monitors();
1346 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1347 for (j = 0; j < len; j++) {
1348 oop monitor = locked_monitors->at(j);
1349 assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
1350 monitors_array->obj_at_put(count, monitor);
1351 depths_array->int_at_put(count, depth);
1352 count++;
1353 }
1354 }
1355
1356 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1357 for (j = 0; j < jni_locked_monitors->length(); j++) {
1358 oop object = jni_locked_monitors->at(j);
1359 assert(object != NULL && object->is_instance(), "must be a Java object");
1360 monitors_array->obj_at_put(count, object);
1361 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1362 depths_array->int_at_put(count, -1);
1363 count++;
1364 }
1365 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1366 }
1367
1368 if (locked_synchronizers) {
1369 // Create Object[] filled with locked JSR-166 synchronizers
1370 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1371 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1372 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1373 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1374
1375 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1376 objArrayHandle sh(THREAD, array);
1377 synchronizers_array = sh;
1378
1379 for (int k = 0; k < num_locked_synchronizers; k++) {
1380 synchronizers_array->obj_at_put(k, locks->at(k));
1381 }
1382 }
1383
1384 // Create java.lang.management.ThreadInfo object
1385 instanceOop info_obj = Management::create_thread_info_instance(ts,
1386 monitors_array,
1387 depths_array,
1388 synchronizers_array,
1389 CHECK_NULL);
1390 result_h->obj_at_put(index, info_obj);
1391 }
1392
1393 return (jobjectArray) JNIHandles::make_local(env, result_h());
1394 JVM_END
1395
1396 // Returns an array of Class objects.
1397 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
1398 ResourceMark rm(THREAD);
1399
1400 LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter
1401
1402 int num_classes = lce.num_loaded_classes();
1403 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
1404 objArrayHandle classes_ah(THREAD, r);
1405
1406 for (int i = 0; i < num_classes; i++) {
1407 KlassHandle kh = lce.get_klass(i);
1408 oop mirror = Klass::cast(kh())->java_mirror();
1409 classes_ah->obj_at_put(i, mirror);
1410 }
1411
1412 return (jobjectArray) JNIHandles::make_local(env, classes_ah());
1413 JVM_END
1414
1415 // Reset statistic. Return true if the requested statistic is reset.
1416 // Otherwise, return false.
1417 //
1418 // Input parameters:
1419 // obj - specify which instance the statistic associated with to be reset
1420 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1421 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1422 // type - the type of statistic to be reset
1423 //
1424 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1425 ResourceMark rm(THREAD);
1426
1427 switch (type) {
1428 case JMM_STAT_PEAK_THREAD_COUNT:
1429 ThreadService::reset_peak_thread_count();
1430 return true;
1431
1432 case JMM_STAT_THREAD_CONTENTION_COUNT:
1433 case JMM_STAT_THREAD_CONTENTION_TIME: {
1434 jlong tid = obj.j;
1435 if (tid < 0) {
1436 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1437 }
1438
1439 // Look for the JavaThread of this given tid
1440 MutexLockerEx ml(Threads_lock);
1441 if (tid == 0) {
1442 // reset contention statistics for all threads if tid == 0
1443 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1444 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1445 ThreadService::reset_contention_count_stat(java_thread);
1446 } else {
1447 ThreadService::reset_contention_time_stat(java_thread);
1448 }
1449 }
1450 } else {
1451 // reset contention statistics for a given thread
1452 JavaThread* java_thread = find_java_thread_from_id(tid);
1453 if (java_thread == NULL) {
1454 return false;
1455 }
1456
1457 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1458 ThreadService::reset_contention_count_stat(java_thread);
1459 } else {
1460 ThreadService::reset_contention_time_stat(java_thread);
1461 }
1462 }
1463 return true;
1464 break;
1465 }
1466 case JMM_STAT_PEAK_POOL_USAGE: {
1467 jobject o = obj.l;
1468 if (o == NULL) {
1469 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1470 }
1471
1472 oop pool_obj = JNIHandles::resolve(o);
1473 assert(pool_obj->is_instance(), "Should be an instanceOop");
1474 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1475
1476 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1477 if (pool != NULL) {
1478 pool->reset_peak_memory_usage();
1479 return true;
1480 }
1481 break;
1482 }
1483 case JMM_STAT_GC_STAT: {
1484 jobject o = obj.l;
1485 if (o == NULL) {
1486 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1487 }
1488
1489 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1490 if (mgr != NULL) {
1491 mgr->reset_gc_stat();
1492 return true;
1493 }
1494 break;
1495 }
1496 default:
1497 assert(0, "Unknown Statistic Type");
1498 }
1499 return false;
1500 JVM_END
1501
1502 // Returns the fast estimate of CPU time consumed by
1503 // a given thread (in nanoseconds).
1504 // If thread_id == 0, return CPU time for the current thread.
1505 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1506 if (!os::is_thread_cpu_time_supported()) {
1507 return -1;
1508 }
1509
1510 if (thread_id < 0) {
1511 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1512 "Invalid thread ID", -1);
1513 }
1514
1515 JavaThread* java_thread = NULL;
1516 if (thread_id == 0) {
1517 // current thread
1518 return os::current_thread_cpu_time();
1519 } else {
1520 MutexLockerEx ml(Threads_lock);
1521 java_thread = find_java_thread_from_id(thread_id);
1522 if (java_thread != NULL) {
1523 return os::thread_cpu_time((Thread*) java_thread);
1524 }
1525 }
1526 return -1;
1527 JVM_END
1528
1529 // Returns the CPU time consumed by a given thread (in nanoseconds).
1530 // If thread_id == 0, CPU time for the current thread is returned.
1531 // If user_sys_cpu_time = true, user level and system CPU time of
1532 // a given thread is returned; otherwise, only user level CPU time
1533 // is returned.
1534 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
1535 if (!os::is_thread_cpu_time_supported()) {
1536 return -1;
1537 }
1538
1539 if (thread_id < 0) {
1540 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1541 "Invalid thread ID", -1);
1542 }
1543
1544 JavaThread* java_thread = NULL;
1545 if (thread_id == 0) {
1546 // current thread
1547 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
1548 } else {
1549 MutexLockerEx ml(Threads_lock);
1550 java_thread = find_java_thread_from_id(thread_id);
1551 if (java_thread != NULL) {
1552 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
1553 }
1554 }
1555 return -1;
1556 JVM_END
1557
1558 // Gets an array containing the CPU times consumed by a set of threads
1559 // (in nanoseconds). Each element of the array is the CPU time for the
1560 // thread ID specified in the corresponding entry in the given array
1561 // of thread IDs; or -1 if the thread does not exist or has terminated.
1562 // If user_sys_cpu_time = true, the sum of user level and system CPU time
1563 // for the given thread is returned; otherwise, only user level CPU time
1564 // is returned.
1565 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
1566 jlongArray timeArray,
1567 jboolean user_sys_cpu_time))
1568 // Check if threads is null
1569 if (ids == NULL || timeArray == NULL) {
1570 THROW(vmSymbols::java_lang_NullPointerException());
1571 }
1572
1573 ResourceMark rm(THREAD);
1574 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1575 typeArrayHandle ids_ah(THREAD, ta);
1576
1577 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
1578 typeArrayHandle timeArray_h(THREAD, tia);
1579
1580 // validate the thread id array
1581 validate_thread_id_array(ids_ah, CHECK);
1582
1583 // timeArray must be of the same length as the given array of thread IDs
1584 int num_threads = ids_ah->length();
1585 if (num_threads != timeArray_h->length()) {
1586 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1587 "The length of the given long array does not match the length of "
1588 "the given array of thread IDs");
1589 }
1590
1591 MutexLockerEx ml(Threads_lock);
1592 for (int i = 0; i < num_threads; i++) {
1593 JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
1594 if (java_thread != NULL) {
1595 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
1596 user_sys_cpu_time != 0));
1597 }
1598 }
1599 JVM_END
1600
1601 // Returns a String array of all VM global flag names
1602 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1603 // last flag entry is always NULL, so subtract 1
1604 int nFlags = (int) Flag::numFlags - 1;
1605 // allocate a temp array
1606 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1607 nFlags, CHECK_0);
1608 objArrayHandle flags_ah(THREAD, r);
1609 int num_entries = 0;
1610 for (int i = 0; i < nFlags; i++) {
1611 Flag* flag = &Flag::flags[i];
1612 // Exclude the locked (experimental, diagnostic) flags
1613 if (flag->is_unlocked() || flag->is_unlocker()) {
1614 Handle s = java_lang_String::create_from_str(flag->name, CHECK_0);
1615 flags_ah->obj_at_put(num_entries, s());
1616 num_entries++;
1617 }
1618 }
1619
1620 if (num_entries < nFlags) {
1621 // Return array of right length
1622 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1623 for(int i = 0; i < num_entries; i++) {
1624 res->obj_at_put(i, flags_ah->obj_at(i));
1625 }
1626 return (jobjectArray)JNIHandles::make_local(env, res);
1627 }
1628
1629 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1630 JVM_END
1631
1632 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1633 // can't be determined, true otherwise. If false is returned, then *global
1634 // will be incomplete and invalid.
1635 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1636 Handle flag_name;
1637 if (name() == NULL) {
1638 flag_name = java_lang_String::create_from_str(flag->name, CHECK_false);
1639 } else {
1640 flag_name = name;
1641 }
1642 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1643
1644 if (flag->is_bool()) {
1645 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1646 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1647 } else if (flag->is_intx()) {
1648 global->value.j = (jlong)flag->get_intx();
1649 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1650 } else if (flag->is_uintx()) {
1651 global->value.j = (jlong)flag->get_uintx();
1652 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1653 } else if (flag->is_uint64_t()) {
1654 global->value.j = (jlong)flag->get_uint64_t();
1655 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1656 } else if (flag->is_ccstr()) {
1657 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1658 global->value.l = (jobject)JNIHandles::make_local(env, str());
1659 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1660 } else {
1661 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1662 return false;
1663 }
1664
1665 global->writeable = flag->is_writeable();
1666 global->external = flag->is_external();
1667 switch (flag->origin) {
1668 case DEFAULT:
1669 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1670 break;
1671 case COMMAND_LINE:
1672 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1673 break;
1674 case ENVIRON_VAR:
1675 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1676 break;
1677 case CONFIG_FILE:
1678 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1679 break;
1680 case MANAGEMENT:
1681 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1682 break;
1683 case ERGONOMIC:
1684 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1685 break;
1686 default:
1687 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1688 }
1689
1690 return true;
1691 }
1692
1693 // Fill globals array of count length with jmmVMGlobal entries
1694 // specified by names. If names == NULL, fill globals array
1695 // with all Flags. Return value is number of entries
1696 // created in globals.
1697 // If a Flag with a given name in an array element does not
1698 // exist, globals[i].name will be set to NULL.
1699 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1700 jobjectArray names,
1701 jmmVMGlobal *globals,
1702 jint count))
1703
1704
1705 if (globals == NULL) {
1706 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1707 }
1708
1709 ResourceMark rm(THREAD);
1710
1711 if (names != NULL) {
1712 // return the requested globals
1713 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1714 objArrayHandle names_ah(THREAD, ta);
1715 // Make sure we have a String array
1716 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1717 if (element_klass != SystemDictionary::String_klass()) {
1718 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1719 "Array element type is not String class", 0);
1720 }
1721
1722 int names_length = names_ah->length();
1723 int num_entries = 0;
1724 for (int i = 0; i < names_length && i < count; i++) {
1725 oop s = names_ah->obj_at(i);
1726 if (s == NULL) {
1727 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1728 }
1729
1730 Handle sh(THREAD, s);
1731 char* str = java_lang_String::as_utf8_string(s);
1732 Flag* flag = Flag::find_flag(str, strlen(str));
1733 if (flag != NULL &&
1734 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1735 num_entries++;
1736 } else {
1737 globals[i].name = NULL;
1738 }
1739 }
1740 return num_entries;
1741 } else {
1742 // return all globals if names == NULL
1743
1744 // last flag entry is always NULL, so subtract 1
1745 int nFlags = (int) Flag::numFlags - 1;
1746 Handle null_h;
1747 int num_entries = 0;
1748 for (int i = 0; i < nFlags && num_entries < count; i++) {
1749 Flag* flag = &Flag::flags[i];
1750 // Exclude the locked (diagnostic, experimental) flags
1751 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1752 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1753 num_entries++;
1754 }
1755 }
1756 return num_entries;
1757 }
1758 JVM_END
1759
1760 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1761 ResourceMark rm(THREAD);
1762
1763 oop fn = JNIHandles::resolve_external_guard(flag_name);
1764 if (fn == NULL) {
1765 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1766 "The flag name cannot be null.");
1767 }
1768 char* name = java_lang_String::as_utf8_string(fn);
1769 Flag* flag = Flag::find_flag(name, strlen(name));
1770 if (flag == NULL) {
1771 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1772 "Flag does not exist.");
1773 }
1774 if (!flag->is_writeable()) {
1775 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1776 "This flag is not writeable.");
1777 }
1778
1779 bool succeed;
1780 if (flag->is_bool()) {
1781 bool bvalue = (new_value.z == JNI_TRUE ? true : false);
1782 succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT);
1783 } else if (flag->is_intx()) {
1784 intx ivalue = (intx)new_value.j;
1785 succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT);
1786 } else if (flag->is_uintx()) {
1787 uintx uvalue = (uintx)new_value.j;
1788 succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT);
1789 } else if (flag->is_uint64_t()) {
1790 uint64_t uvalue = (uint64_t)new_value.j;
1791 succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, MANAGEMENT);
1792 } else if (flag->is_ccstr()) {
1793 oop str = JNIHandles::resolve_external_guard(new_value.l);
1794 if (str == NULL) {
1795 THROW(vmSymbols::java_lang_NullPointerException());
1796 }
1797 ccstr svalue = java_lang_String::as_utf8_string(str);
1798 succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT);
1799 }
1800 assert(succeed, "Setting flag should succeed");
1801 JVM_END
1802
1803 class ThreadTimesClosure: public ThreadClosure {
1804 private:
1805 objArrayOop _names;
1806 typeArrayOop _times;
1807 int _names_len;
1808 int _times_len;
1809 int _count;
1810
1811 public:
1812 ThreadTimesClosure(objArrayOop names, typeArrayOop times);
1813 virtual void do_thread(Thread* thread);
1814 int count() { return _count; }
1815 };
1816
1817 ThreadTimesClosure::ThreadTimesClosure(objArrayOop names,
1818 typeArrayOop times) {
1819 assert(names != NULL, "names was NULL");
1820 assert(times != NULL, "times was NULL");
1821 _names = names;
1822 _names_len = names->length();
1823 _times = times;
1824 _times_len = times->length();
1825 _count = 0;
1826 }
1827
1828 void ThreadTimesClosure::do_thread(Thread* thread) {
1829 Handle s;
1830 assert(thread != NULL, "thread was NULL");
1831
1832 // exclude externally visible JavaThreads
1833 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1834 return;
1835 }
1836
1837 if (_count >= _names_len || _count >= _times_len) {
1838 // skip if the result array is not big enough
1839 return;
1840 }
1841
1842 EXCEPTION_MARK;
1843
1844 assert(thread->name() != NULL, "All threads should have a name");
1845 s = java_lang_String::create_from_str(thread->name(), CHECK);
1846 _names->obj_at_put(_count, s());
1847
1848 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1849 os::thread_cpu_time(thread) : -1);
1850 _count++;
1851 }
1852
1853 // Fills names with VM internal thread names and times with the corresponding
1854 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1855 // If the element type of names is not String, an IllegalArgumentException is
1856 // thrown.
1857 // If an array is not large enough to hold all the entries, only the entries
1858 // that fit will be returned. Return value is the number of VM internal
1859 // threads entries.
1860 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1861 jobjectArray names,
1862 jlongArray times))
1863 if (names == NULL || times == NULL) {
1864 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1865 }
1866 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1867 objArrayHandle names_ah(THREAD, na);
1868
1869 // Make sure we have a String array
1870 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1871 if (element_klass != SystemDictionary::String_klass()) {
1872 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1873 "Array element type is not String class", 0);
1874 }
1875
1876 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1877 typeArrayHandle times_ah(THREAD, ta);
1878
1879 ThreadTimesClosure ttc(names_ah(), times_ah());
1880 {
1881 MutexLockerEx ml(Threads_lock);
1882 Threads::threads_do(&ttc);
1883 }
1884
1885 return ttc.count();
1886 JVM_END
1887
1888 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1889 ResourceMark rm(THREAD);
1890
1891 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1892 VMThread::execute(&op);
1893
1894 DeadlockCycle* deadlocks = op.result();
1895 if (deadlocks == NULL) {
1896 // no deadlock found and return
1897 return Handle();
1898 }
1899
1900 int num_threads = 0;
1901 DeadlockCycle* cycle;
1902 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1903 num_threads += cycle->num_threads();
1904 }
1905
1906 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1907 objArrayHandle threads_ah(THREAD, r);
1908
1909 int index = 0;
1910 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1911 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1912 int len = deadlock_threads->length();
1913 for (int i = 0; i < len; i++) {
1914 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1915 index++;
1916 }
1917 }
1918 return threads_ah;
1919 }
1920
1921 // Finds cycles of threads that are deadlocked involved in object monitors
1922 // and JSR-166 synchronizers.
1923 // Returns an array of Thread objects which are in deadlock, if any.
1924 // Otherwise, returns NULL.
1925 //
1926 // Input parameter:
1927 // object_monitors_only - if true, only check object monitors
1928 //
1929 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1930 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1931 return (jobjectArray) JNIHandles::make_local(env, result());
1932 JVM_END
1933
1934 // Finds cycles of threads that are deadlocked on monitor locks
1935 // Returns an array of Thread objects which are in deadlock, if any.
1936 // Otherwise, returns NULL.
1937 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1938 Handle result = find_deadlocks(true, CHECK_0);
1939 return (jobjectArray) JNIHandles::make_local(env, result());
1940 JVM_END
1941
1942 // Gets the information about GC extension attributes including
1943 // the name of the attribute, its type, and a short description.
1944 //
1945 // Input parameters:
1946 // mgr - GC memory manager
1947 // info - caller allocated array of jmmExtAttributeInfo
1948 // count - number of elements of the info array
1949 //
1950 // Returns the number of GC extension attributes filled in the info array; or
1951 // -1 if info is not big enough
1952 //
1953 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1954 // All GC memory managers have 1 attribute (number of GC threads)
1955 if (count == 0) {
1956 return 0;
1957 }
1958
1959 if (info == NULL) {
1960 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1961 }
1962
1963 info[0].name = "GcThreadCount";
1964 info[0].type = 'I';
1965 info[0].description = "Number of GC threads";
1966 return 1;
1967 JVM_END
1968
1969 // verify the given array is an array of java/lang/management/MemoryUsage objects
1970 // of a given length and return the objArrayOop
1971 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1972 if (array == NULL) {
1973 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1974 }
1975
1976 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1977 objArrayHandle array_h(THREAD, oa);
1978
1979 // array must be of the given length
1980 if (length != array_h->length()) {
1981 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1982 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1983 }
1984
1985 // check if the element of array is of type MemoryUsage class
1986 klassOop usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1987 klassOop element_klass = objArrayKlass::cast(array_h->klass())->element_klass();
1988 if (element_klass != usage_klass) {
1989 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1990 "The element type is not MemoryUsage class", 0);
1991 }
1992
1993 return array_h();
1994 }
1995
1996 // Gets the statistics of the last GC of a given GC memory manager.
1997 // Input parameters:
1998 // obj - GarbageCollectorMXBean object
1999 // gc_stat - caller allocated jmmGCStat where:
2000 // a. before_gc_usage - array of MemoryUsage objects
2001 // b. after_gc_usage - array of MemoryUsage objects
2002 // c. gc_ext_attributes_values_size is set to the
2003 // gc_ext_attribute_values array allocated
2004 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
2005 //
2006 // On return,
2007 // gc_index == 0 indicates no GC statistics available
2008 //
2009 // before_gc_usage and after_gc_usage - filled with per memory pool
2010 // before and after GC usage in the same order as the memory pools
2011 // returned by GetMemoryPools for a given GC memory manager.
2012 // num_gc_ext_attributes indicates the number of elements in
2013 // the gc_ext_attribute_values array is filled; or
2014 // -1 if the gc_ext_attributes_values array is not big enough
2015 //
2016 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
2017 ResourceMark rm(THREAD);
2018
2019 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
2020 THROW(vmSymbols::java_lang_NullPointerException());
2021 }
2022
2023 // Get the GCMemoryManager
2024 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2025
2026 // Make a copy of the last GC statistics
2027 // GC may occur while constructing the last GC information
2028 int num_pools = MemoryService::num_memory_pools();
2029 GCStatInfo* stat = new GCStatInfo(num_pools);
2030 if (mgr->get_last_gc_stat(stat) == 0) {
2031 gc_stat->gc_index = 0;
2032 return;
2033 }
2034
2035 gc_stat->gc_index = stat->gc_index();
2036 gc_stat->start_time = Management::ticks_to_ms(stat->start_time());
2037 gc_stat->end_time = Management::ticks_to_ms(stat->end_time());
2038
2039 // Current implementation does not have GC extension attributes
2040 gc_stat->num_gc_ext_attributes = 0;
2041
2042 // Fill the arrays of MemoryUsage objects with before and after GC
2043 // per pool memory usage
2044 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
2045 num_pools,
2046 CHECK);
2047 objArrayHandle usage_before_gc_ah(THREAD, bu);
2048
2049 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
2050 num_pools,
2051 CHECK);
2052 objArrayHandle usage_after_gc_ah(THREAD, au);
2053
2054 for (int i = 0; i < num_pools; i++) {
2055 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat->before_gc_usage_for_pool(i), CHECK);
2056 Handle after_usage;
2057
2058 MemoryUsage u = stat->after_gc_usage_for_pool(i);
2059 if (u.max_size() == 0 && u.used() > 0) {
2060 // If max size == 0, this pool is a survivor space.
2061 // Set max size = -1 since the pools will be swapped after GC.
2062 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
2063 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
2064 } else {
2065 after_usage = MemoryService::create_MemoryUsage_obj(stat->after_gc_usage_for_pool(i), CHECK);
2066 }
2067 usage_before_gc_ah->obj_at_put(i, before_usage());
2068 usage_after_gc_ah->obj_at_put(i, after_usage());
2069 }
2070
2071 if (gc_stat->gc_ext_attribute_values_size > 0) {
2072 // Current implementation only has 1 attribute (number of GC threads)
2073 // The type is 'I'
2074 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
2075 }
2076 JVM_END
2077
2078 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
2079 ResourceMark rm(THREAD);
2080 // Get the GCMemoryManager
2081 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2082 mgr->set_notification_enabled(enabled?true:false);
2083 JVM_END
2084
2085 // Dump heap - Returns 0 if succeeds.
2086 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
2087 #ifndef SERVICES_KERNEL
2088 ResourceMark rm(THREAD);
2089 oop on = JNIHandles::resolve_external_guard(outputfile);
2090 if (on == NULL) {
2091 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2092 "Output file name cannot be null.", -1);
2093 }
2094 char* name = java_lang_String::as_utf8_string(on);
2095 if (name == NULL) {
2096 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2097 "Output file name cannot be null.", -1);
2098 }
2099 HeapDumper dumper(live ? true : false);
2100 if (dumper.dump(name) != 0) {
2101 const char* errmsg = dumper.error_as_C_string();
2102 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
2103 }
2104 return 0;
2105 #else // SERVICES_KERNEL
2106 return -1;
2107 #endif // SERVICES_KERNEL
2108 JVM_END
2109
2110 jlong Management::ticks_to_ms(jlong ticks) {
2111 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2112 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2113 * (double)1000.0);
2114 }
2115
2116 const struct jmmInterface_1_ jmm_interface = {
2117 NULL,
2118 NULL,
2119 jmm_GetVersion,
2120 jmm_GetOptionalSupport,
2121 jmm_GetInputArguments,
2122 jmm_GetThreadInfo,
2123 jmm_GetInputArgumentArray,
2124 jmm_GetMemoryPools,
2125 jmm_GetMemoryManagers,
2126 jmm_GetMemoryPoolUsage,
2127 jmm_GetPeakMemoryPoolUsage,
2128 jmm_GetThreadAllocatedMemory,
2129 jmm_GetMemoryUsage,
2130 jmm_GetLongAttribute,
2131 jmm_GetBoolAttribute,
2132 jmm_SetBoolAttribute,
2133 jmm_GetLongAttributes,
2134 jmm_FindMonitorDeadlockedThreads,
2135 jmm_GetThreadCpuTime,
2136 jmm_GetVMGlobalNames,
2137 jmm_GetVMGlobals,
2138 jmm_GetInternalThreadTimes,
2139 jmm_ResetStatistic,
2140 jmm_SetPoolSensor,
2141 jmm_SetPoolThreshold,
2142 jmm_GetPoolCollectionUsage,
2143 jmm_GetGCExtAttributeInfo,
2144 jmm_GetLastGCStat,
2145 jmm_GetThreadCpuTimeWithKind,
2146 jmm_GetThreadCpuTimesWithKind,
2147 jmm_DumpHeap0,
2148 jmm_FindDeadlockedThreads,
2149 jmm_SetVMGlobal,
2150 NULL,
2151 jmm_DumpThreads,
2152 jmm_SetGCNotificationEnabled
2153 };
2154
2155 void* Management::get_jmm_interface(int version) {
2156 if (version == JMM_VERSION_1_0) {
2157 return (void*) &jmm_interface;
2158 }
2159 return NULL;
2160 }