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