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