1/*
2 * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "jmm.h"
27#include "classfile/classLoader.hpp"
28#include "classfile/systemDictionary.hpp"
29#include "compiler/compileBroker.hpp"
30#include "memory/allocation.inline.hpp"
31#include "memory/iterator.hpp"
32#include "memory/oopFactory.hpp"
33#include "memory/resourceArea.hpp"
34#include "memory/universe.hpp"
35#include "oops/klass.hpp"
36#include "oops/objArrayKlass.hpp"
37#include "oops/objArrayOop.inline.hpp"
38#include "oops/oop.inline.hpp"
39#include "oops/typeArrayOop.inline.hpp"
40#include "runtime/arguments.hpp"
41#include "runtime/flags/jvmFlag.hpp"
42#include "runtime/globals.hpp"
43#include "runtime/handles.inline.hpp"
44#include "runtime/interfaceSupport.inline.hpp"
45#include "runtime/javaCalls.hpp"
46#include "runtime/jniHandles.inline.hpp"
47#include "runtime/os.hpp"
48#include "runtime/serviceThread.hpp"
49#include "runtime/thread.inline.hpp"
50#include "runtime/threadSMR.hpp"
51#include "services/classLoadingService.hpp"
52#include "services/diagnosticCommand.hpp"
53#include "services/diagnosticFramework.hpp"
54#include "services/writeableFlags.hpp"
55#include "services/heapDumper.hpp"
56#include "services/lowMemoryDetector.hpp"
57#include "services/gcNotifier.hpp"
58#include "services/nmtDCmd.hpp"
59#include "services/management.hpp"
60#include "services/memoryManager.hpp"
61#include "services/memoryPool.hpp"
62#include "services/memoryService.hpp"
63#include "services/runtimeService.hpp"
64#include "services/threadService.hpp"
65#include "utilities/debug.hpp"
66#include "utilities/formatBuffer.hpp"
67#include "utilities/macros.hpp"
68
69PerfVariable* Management::_begin_vm_creation_time = NULL;
70PerfVariable* Management::_end_vm_creation_time = NULL;
71PerfVariable* Management::_vm_init_done_time = NULL;
72
73InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
74InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
75InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
76InstanceKlass* Management::_gcInfo_klass = NULL;
77InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
78InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
79InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
80InstanceKlass* Management::_memoryUsage_klass = NULL;
81InstanceKlass* Management::_sensor_klass = NULL;
82InstanceKlass* Management::_threadInfo_klass = NULL;
83
84jmmOptionalSupport Management::_optional_support = {0};
85TimeStamp Management::_stamp;
86
87void management_init() {
88#if INCLUDE_MANAGEMENT
89 Management::init();
90 ThreadService::init();
91 RuntimeService::init();
92 ClassLoadingService::init();
93#else
94 ThreadService::init();
95#endif // INCLUDE_MANAGEMENT
96}
97
98#if INCLUDE_MANAGEMENT
99
100void Management::init() {
101 EXCEPTION_MARK;
102
103 // These counters are for java.lang.management API support.
104 // They are created even if -XX:-UsePerfData is set and in
105 // that case, they will be allocated on C heap.
106
107 _begin_vm_creation_time =
108 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
109 PerfData::U_None, CHECK);
110
111 _end_vm_creation_time =
112 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
113 PerfData::U_None, CHECK);
114
115 _vm_init_done_time =
116 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
117 PerfData::U_None, CHECK);
118
119 // Initialize optional support
120 _optional_support.isLowMemoryDetectionSupported = 1;
121 _optional_support.isCompilationTimeMonitoringSupported = 1;
122 _optional_support.isThreadContentionMonitoringSupported = 1;
123
124 if (os::is_thread_cpu_time_supported()) {
125 _optional_support.isCurrentThreadCpuTimeSupported = 1;
126 _optional_support.isOtherThreadCpuTimeSupported = 1;
127 } else {
128 _optional_support.isCurrentThreadCpuTimeSupported = 0;
129 _optional_support.isOtherThreadCpuTimeSupported = 0;
130 }
131
132 _optional_support.isObjectMonitorUsageSupported = 1;
133#if INCLUDE_SERVICES
134 // This depends on the heap inspector
135 _optional_support.isSynchronizerUsageSupported = 1;
136#endif // INCLUDE_SERVICES
137 _optional_support.isThreadAllocatedMemorySupported = 1;
138 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
139
140 // Registration of the diagnostic commands
141 DCmdRegistrant::register_dcmds();
142 DCmdRegistrant::register_dcmds_ext();
143 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
144 | DCmd_Source_MBean;
145 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
146}
147
148void Management::initialize(TRAPS) {
149 // Start the service thread
150 ServiceThread::initialize();
151
152 if (ManagementServer) {
153 ResourceMark rm(THREAD);
154 HandleMark hm(THREAD);
155
156 // Load and initialize the jdk.internal.agent.Agent class
157 // invoke startAgent method to start the management server
158 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
159 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
160 loader,
161 Handle(),
162 THREAD);
163 if (k == NULL) {
164 vm_exit_during_initialization("Management agent initialization failure: "
165 "class jdk.internal.agent.Agent not found.");
166 }
167
168 JavaValue result(T_VOID);
169 JavaCalls::call_static(&result,
170 k,
171 vmSymbols::startAgent_name(),
172 vmSymbols::void_method_signature(),
173 CHECK);
174 }
175}
176
177void Management::get_optional_support(jmmOptionalSupport* support) {
178 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
179}
180
181InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
182 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
183 return initialize_klass(k, THREAD);
184}
185
186InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
187 Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
188 if (k == NULL) {
189 return NULL;
190 }
191 return initialize_klass(k, THREAD);
192}
193
194InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
195 InstanceKlass* ik = InstanceKlass::cast(k);
196 if (ik->should_be_initialized()) {
197 ik->initialize(CHECK_NULL);
198 }
199 // If these classes change to not be owned by the boot loader, they need
200 // to be walked to keep their class loader alive in oops_do.
201 assert(ik->class_loader() == NULL, "need to follow in oops_do");
202 return ik;
203}
204
205void Management::record_vm_startup_time(jlong begin, jlong duration) {
206 // if the performance counter is not initialized,
207 // then vm initialization failed; simply return.
208 if (_begin_vm_creation_time == NULL) return;
209
210 _begin_vm_creation_time->set_value(begin);
211 _end_vm_creation_time->set_value(begin + duration);
212 PerfMemory::set_accessible(true);
213}
214
215jlong Management::timestamp() {
216 TimeStamp t;
217 t.update();
218 return t.ticks() - _stamp.ticks();
219}
220
221void Management::oops_do(OopClosure* f) {
222 MemoryService::oops_do(f);
223 ThreadService::oops_do(f);
224}
225
226InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
227 if (_threadInfo_klass == NULL) {
228 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
229 }
230 return _threadInfo_klass;
231}
232
233InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
234 if (_memoryUsage_klass == NULL) {
235 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
236 }
237 return _memoryUsage_klass;
238}
239
240InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
241 if (_memoryPoolMXBean_klass == NULL) {
242 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
243 }
244 return _memoryPoolMXBean_klass;
245}
246
247InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
248 if (_memoryManagerMXBean_klass == NULL) {
249 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
250 }
251 return _memoryManagerMXBean_klass;
252}
253
254InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
255 if (_garbageCollectorMXBean_klass == NULL) {
256 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
257 }
258 return _garbageCollectorMXBean_klass;
259}
260
261InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
262 if (_sensor_klass == NULL) {
263 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
264 }
265 return _sensor_klass;
266}
267
268InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
269 if (_managementFactoryHelper_klass == NULL) {
270 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
271 }
272 return _managementFactoryHelper_klass;
273}
274
275InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
276 if (_garbageCollectorExtImpl_klass == NULL) {
277 _garbageCollectorExtImpl_klass =
278 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
279 }
280 return _garbageCollectorExtImpl_klass;
281}
282
283InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
284 if (_gcInfo_klass == NULL) {
285 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
286 }
287 return _gcInfo_klass;
288}
289
290InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
291 if (_diagnosticCommandImpl_klass == NULL) {
292 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
293 }
294 return _diagnosticCommandImpl_klass;
295}
296
297static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
298 Handle snapshot_thread(THREAD, snapshot->threadObj());
299
300 jlong contended_time;
301 jlong waited_time;
302 if (ThreadService::is_thread_monitoring_contention()) {
303 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
304 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
305 } else {
306 // set them to -1 if thread contention monitoring is disabled.
307 contended_time = max_julong;
308 waited_time = max_julong;
309 }
310
311 int thread_status = snapshot->thread_status();
312 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
313 if (snapshot->is_ext_suspended()) {
314 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
315 }
316 if (snapshot->is_in_native()) {
317 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
318 }
319
320 ThreadStackTrace* st = snapshot->get_stack_trace();
321 Handle stacktrace_h;
322 if (st != NULL) {
323 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
324 } else {
325 stacktrace_h = Handle();
326 }
327
328 args->push_oop(snapshot_thread);
329 args->push_int(thread_status);
330 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
331 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
332 args->push_long(snapshot->contended_enter_count());
333 args->push_long(contended_time);
334 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
335 args->push_long(waited_time);
336 args->push_oop(stacktrace_h);
337}
338
339// Helper function to construct a ThreadInfo object
340instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
341 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
342 JavaCallArguments args(14);
343
344 // initialize the arguments for the ThreadInfo constructor
345 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
346
347 // Call ThreadInfo constructor with no locked monitors and synchronizers
348 Handle element = JavaCalls::construct_new_instance(
349 ik,
350 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
351 &args,
352 CHECK_NULL);
353 return (instanceOop) element();
354}
355
356instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
357 objArrayHandle monitors_array,
358 typeArrayHandle depths_array,
359 objArrayHandle synchronizers_array,
360 TRAPS) {
361 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
362 JavaCallArguments args(17);
363
364 // initialize the arguments for the ThreadInfo constructor
365 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
366
367 // push the locked monitors and synchronizers in the arguments
368 args.push_oop(monitors_array);
369 args.push_oop(depths_array);
370 args.push_oop(synchronizers_array);
371
372 // Call ThreadInfo constructor with locked monitors and synchronizers
373 Handle element = JavaCalls::construct_new_instance(
374 ik,
375 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
376 &args,
377 CHECK_NULL);
378 return (instanceOop) element();
379}
380
381
382static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
383 if (mgr == NULL) {
384 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
385 }
386 oop mgr_obj = JNIHandles::resolve(mgr);
387 instanceHandle h(THREAD, (instanceOop) mgr_obj);
388
389 InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
390 if (!h->is_a(k)) {
391 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
392 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
393 NULL);
394 }
395
396 MemoryManager* gc = MemoryService::get_memory_manager(h);
397 if (gc == NULL || !gc->is_gc_memory_manager()) {
398 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
399 "Invalid GC memory manager",
400 NULL);
401 }
402 return (GCMemoryManager*) gc;
403}
404
405static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
406 if (obj == NULL) {
407 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
408 }
409
410 oop pool_obj = JNIHandles::resolve(obj);
411 assert(pool_obj->is_instance(), "Should be an instanceOop");
412 instanceHandle ph(THREAD, (instanceOop) pool_obj);
413
414 return MemoryService::get_memory_pool(ph);
415}
416
417#endif // INCLUDE_MANAGEMENT
418
419static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
420 int num_threads = ids_ah->length();
421
422 // Validate input thread IDs
423 int i = 0;
424 for (i = 0; i < num_threads; i++) {
425 jlong tid = ids_ah->long_at(i);
426 if (tid <= 0) {
427 // throw exception if invalid thread id.
428 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
429 "Invalid thread ID entry");
430 }
431 }
432}
433
434#if INCLUDE_MANAGEMENT
435
436static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
437 // check if the element of infoArray is of type ThreadInfo class
438 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
439 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
440 if (element_klass != threadinfo_klass) {
441 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
442 "infoArray element type is not ThreadInfo class");
443 }
444}
445
446
447static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
448 if (obj == NULL) {
449 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
450 }
451
452 oop mgr_obj = JNIHandles::resolve(obj);
453 assert(mgr_obj->is_instance(), "Should be an instanceOop");
454 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
455
456 return MemoryService::get_memory_manager(mh);
457}
458
459// Returns a version string and sets major and minor version if
460// the input parameters are non-null.
461JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
462 return JMM_VERSION;
463JVM_END
464
465// Gets the list of VM monitoring and management optional supports
466// Returns 0 if succeeded; otherwise returns non-zero.
467JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
468 if (support == NULL) {
469 return -1;
470 }
471 Management::get_optional_support(support);
472 return 0;
473JVM_END
474
475// Returns an array of java/lang/management/MemoryPoolMXBean object
476// one for each memory pool if obj == null; otherwise returns
477// an array of memory pools for a given memory manager if
478// it is a valid memory manager.
479JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
480 ResourceMark rm(THREAD);
481
482 int num_memory_pools;
483 MemoryManager* mgr = NULL;
484 if (obj == NULL) {
485 num_memory_pools = MemoryService::num_memory_pools();
486 } else {
487 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
488 if (mgr == NULL) {
489 return NULL;
490 }
491 num_memory_pools = mgr->num_memory_pools();
492 }
493
494 // Allocate the resulting MemoryPoolMXBean[] object
495 InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
496 objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
497 objArrayHandle poolArray(THREAD, r);
498
499 if (mgr == NULL) {
500 // Get all memory pools
501 for (int i = 0; i < num_memory_pools; i++) {
502 MemoryPool* pool = MemoryService::get_memory_pool(i);
503 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
504 instanceHandle ph(THREAD, p);
505 poolArray->obj_at_put(i, ph());
506 }
507 } else {
508 // Get memory pools managed by a given memory manager
509 for (int i = 0; i < num_memory_pools; i++) {
510 MemoryPool* pool = mgr->get_memory_pool(i);
511 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
512 instanceHandle ph(THREAD, p);
513 poolArray->obj_at_put(i, ph());
514 }
515 }
516 return (jobjectArray) JNIHandles::make_local(env, poolArray());
517JVM_END
518
519// Returns an array of java/lang/management/MemoryManagerMXBean object
520// one for each memory manager if obj == null; otherwise returns
521// an array of memory managers for a given memory pool if
522// it is a valid memory pool.
523JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
524 ResourceMark rm(THREAD);
525
526 int num_mgrs;
527 MemoryPool* pool = NULL;
528 if (obj == NULL) {
529 num_mgrs = MemoryService::num_memory_managers();
530 } else {
531 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
532 if (pool == NULL) {
533 return NULL;
534 }
535 num_mgrs = pool->num_memory_managers();
536 }
537
538 // Allocate the resulting MemoryManagerMXBean[] object
539 InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
540 objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
541 objArrayHandle mgrArray(THREAD, r);
542
543 if (pool == NULL) {
544 // Get all memory managers
545 for (int i = 0; i < num_mgrs; i++) {
546 MemoryManager* mgr = MemoryService::get_memory_manager(i);
547 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
548 instanceHandle ph(THREAD, p);
549 mgrArray->obj_at_put(i, ph());
550 }
551 } else {
552 // Get memory managers for a given memory pool
553 for (int i = 0; i < num_mgrs; i++) {
554 MemoryManager* mgr = pool->get_memory_manager(i);
555 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
556 instanceHandle ph(THREAD, p);
557 mgrArray->obj_at_put(i, ph());
558 }
559 }
560 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
561JVM_END
562
563
564// Returns a java/lang/management/MemoryUsage object containing the memory usage
565// of a given memory pool.
566JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
567 ResourceMark rm(THREAD);
568
569 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
570 if (pool != NULL) {
571 MemoryUsage usage = pool->get_memory_usage();
572 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
573 return JNIHandles::make_local(env, h());
574 } else {
575 return NULL;
576 }
577JVM_END
578
579// Returns a java/lang/management/MemoryUsage object containing the memory usage
580// of a given memory pool.
581JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
582 ResourceMark rm(THREAD);
583
584 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
585 if (pool != NULL) {
586 MemoryUsage usage = pool->get_peak_memory_usage();
587 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
588 return JNIHandles::make_local(env, h());
589 } else {
590 return NULL;
591 }
592JVM_END
593
594// Returns a java/lang/management/MemoryUsage object containing the memory usage
595// of a given memory pool after most recent GC.
596JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
597 ResourceMark rm(THREAD);
598
599 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
600 if (pool != NULL && pool->is_collected_pool()) {
601 MemoryUsage usage = pool->get_last_collection_usage();
602 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
603 return JNIHandles::make_local(env, h());
604 } else {
605 return NULL;
606 }
607JVM_END
608
609// Sets the memory pool sensor for a threshold type
610JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
611 if (obj == NULL || sensorObj == NULL) {
612 THROW(vmSymbols::java_lang_NullPointerException());
613 }
614
615 InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
616 oop s = JNIHandles::resolve(sensorObj);
617 assert(s->is_instance(), "Sensor should be an instanceOop");
618 instanceHandle sensor_h(THREAD, (instanceOop) s);
619 if (!sensor_h->is_a(sensor_klass)) {
620 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
621 "Sensor is not an instance of sun.management.Sensor class");
622 }
623
624 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
625 assert(mpool != NULL, "MemoryPool should exist");
626
627 switch (type) {
628 case JMM_USAGE_THRESHOLD_HIGH:
629 case JMM_USAGE_THRESHOLD_LOW:
630 // have only one sensor for threshold high and low
631 mpool->set_usage_sensor_obj(sensor_h);
632 break;
633 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
634 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
635 // have only one sensor for threshold high and low
636 mpool->set_gc_usage_sensor_obj(sensor_h);
637 break;
638 default:
639 assert(false, "Unrecognized type");
640 }
641
642JVM_END
643
644
645// Sets the threshold of a given memory pool.
646// Returns the previous threshold.
647//
648// Input parameters:
649// pool - the MemoryPoolMXBean object
650// type - threshold type
651// threshold - the new threshold (must not be negative)
652//
653JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
654 if (threshold < 0) {
655 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
656 "Invalid threshold value",
657 -1);
658 }
659
660 if ((size_t)threshold > max_uintx) {
661 stringStream st;
662 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
663 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
664 }
665
666 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
667 assert(pool != NULL, "MemoryPool should exist");
668
669 jlong prev = 0;
670 switch (type) {
671 case JMM_USAGE_THRESHOLD_HIGH:
672 if (!pool->usage_threshold()->is_high_threshold_supported()) {
673 return -1;
674 }
675 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
676 break;
677
678 case JMM_USAGE_THRESHOLD_LOW:
679 if (!pool->usage_threshold()->is_low_threshold_supported()) {
680 return -1;
681 }
682 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
683 break;
684
685 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
686 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
687 return -1;
688 }
689 // return and the new threshold is effective for the next GC
690 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
691
692 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
693 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
694 return -1;
695 }
696 // return and the new threshold is effective for the next GC
697 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
698
699 default:
700 assert(false, "Unrecognized type");
701 return -1;
702 }
703
704 // When the threshold is changed, reevaluate if the low memory
705 // detection is enabled.
706 if (prev != threshold) {
707 LowMemoryDetector::recompute_enabled_for_collected_pools();
708 LowMemoryDetector::detect_low_memory(pool);
709 }
710 return prev;
711JVM_END
712
713// Returns a java/lang/management/MemoryUsage object representing
714// the memory usage for the heap or non-heap memory.
715JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
716 ResourceMark rm(THREAD);
717
718 MemoryUsage usage;
719
720 if (heap) {
721 usage = Universe::heap()->memory_usage();
722 } else {
723 // Calculate the memory usage by summing up the pools.
724 size_t total_init = 0;
725 size_t total_used = 0;
726 size_t total_committed = 0;
727 size_t total_max = 0;
728 bool has_undefined_init_size = false;
729 bool has_undefined_max_size = false;
730
731 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
732 MemoryPool* pool = MemoryService::get_memory_pool(i);
733 if (pool->is_non_heap()) {
734 MemoryUsage u = pool->get_memory_usage();
735 total_used += u.used();
736 total_committed += u.committed();
737
738 if (u.init_size() == MemoryUsage::undefined_size()) {
739 has_undefined_init_size = true;
740 }
741 if (!has_undefined_init_size) {
742 total_init += u.init_size();
743 }
744
745 if (u.max_size() == MemoryUsage::undefined_size()) {
746 has_undefined_max_size = true;
747 }
748 if (!has_undefined_max_size) {
749 total_max += u.max_size();
750 }
751 }
752 }
753
754 // if any one of the memory pool has undefined init_size or max_size,
755 // set it to MemoryUsage::undefined_size()
756 if (has_undefined_init_size) {
757 total_init = MemoryUsage::undefined_size();
758 }
759 if (has_undefined_max_size) {
760 total_max = MemoryUsage::undefined_size();
761 }
762
763 usage = MemoryUsage(total_init, total_used, total_committed, total_max);
764 }
765
766 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
767 return JNIHandles::make_local(env, obj());
768JVM_END
769
770// Returns the boolean value of a given attribute.
771JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
772 switch (att) {
773 case JMM_VERBOSE_GC:
774 return MemoryService::get_verbose();
775 case JMM_VERBOSE_CLASS:
776 return ClassLoadingService::get_verbose();
777 case JMM_THREAD_CONTENTION_MONITORING:
778 return ThreadService::is_thread_monitoring_contention();
779 case JMM_THREAD_CPU_TIME:
780 return ThreadService::is_thread_cpu_time_enabled();
781 case JMM_THREAD_ALLOCATED_MEMORY:
782 return ThreadService::is_thread_allocated_memory_enabled();
783 default:
784 assert(0, "Unrecognized attribute");
785 return false;
786 }
787JVM_END
788
789// Sets the given boolean attribute and returns the previous value.
790JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
791 switch (att) {
792 case JMM_VERBOSE_GC:
793 return MemoryService::set_verbose(flag != 0);
794 case JMM_VERBOSE_CLASS:
795 return ClassLoadingService::set_verbose(flag != 0);
796 case JMM_THREAD_CONTENTION_MONITORING:
797 return ThreadService::set_thread_monitoring_contention(flag != 0);
798 case JMM_THREAD_CPU_TIME:
799 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
800 case JMM_THREAD_ALLOCATED_MEMORY:
801 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
802 default:
803 assert(0, "Unrecognized attribute");
804 return false;
805 }
806JVM_END
807
808
809static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
810 switch (att) {
811 case JMM_GC_TIME_MS:
812 return mgr->gc_time_ms();
813
814 case JMM_GC_COUNT:
815 return mgr->gc_count();
816
817 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
818 // current implementation only has 1 ext attribute
819 return 1;
820
821 default:
822 assert(0, "Unrecognized GC attribute");
823 return -1;
824 }
825}
826
827class VmThreadCountClosure: public ThreadClosure {
828 private:
829 int _count;
830 public:
831 VmThreadCountClosure() : _count(0) {};
832 void do_thread(Thread* thread);
833 int count() { return _count; }
834};
835
836void VmThreadCountClosure::do_thread(Thread* thread) {
837 // exclude externally visible JavaThreads
838 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
839 return;
840 }
841
842 _count++;
843}
844
845static jint get_vm_thread_count() {
846 VmThreadCountClosure vmtcc;
847 {
848 MutexLocker ml(Threads_lock);
849 Threads::threads_do(&vmtcc);
850 }
851
852 return vmtcc.count();
853}
854
855static jint get_num_flags() {
856 // last flag entry is always NULL, so subtract 1
857 int nFlags = (int) JVMFlag::numFlags - 1;
858 int count = 0;
859 for (int i = 0; i < nFlags; i++) {
860 JVMFlag* flag = &JVMFlag::flags[i];
861 // Exclude the locked (diagnostic, experimental) flags
862 if (flag->is_unlocked() || flag->is_unlocker()) {
863 count++;
864 }
865 }
866 return count;
867}
868
869static jlong get_long_attribute(jmmLongAttribute att) {
870 switch (att) {
871 case JMM_CLASS_LOADED_COUNT:
872 return ClassLoadingService::loaded_class_count();
873
874 case JMM_CLASS_UNLOADED_COUNT:
875 return ClassLoadingService::unloaded_class_count();
876
877 case JMM_THREAD_TOTAL_COUNT:
878 return ThreadService::get_total_thread_count();
879
880 case JMM_THREAD_LIVE_COUNT:
881 return ThreadService::get_live_thread_count();
882
883 case JMM_THREAD_PEAK_COUNT:
884 return ThreadService::get_peak_thread_count();
885
886 case JMM_THREAD_DAEMON_COUNT:
887 return ThreadService::get_daemon_thread_count();
888
889 case JMM_JVM_INIT_DONE_TIME_MS:
890 return Management::vm_init_done_time();
891
892 case JMM_JVM_UPTIME_MS:
893 return Management::ticks_to_ms(os::elapsed_counter());
894
895 case JMM_COMPILE_TOTAL_TIME_MS:
896 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
897
898 case JMM_OS_PROCESS_ID:
899 return os::current_process_id();
900
901 // Hotspot-specific counters
902 case JMM_CLASS_LOADED_BYTES:
903 return ClassLoadingService::loaded_class_bytes();
904
905 case JMM_CLASS_UNLOADED_BYTES:
906 return ClassLoadingService::unloaded_class_bytes();
907
908 case JMM_SHARED_CLASS_LOADED_COUNT:
909 return ClassLoadingService::loaded_shared_class_count();
910
911 case JMM_SHARED_CLASS_UNLOADED_COUNT:
912 return ClassLoadingService::unloaded_shared_class_count();
913
914
915 case JMM_SHARED_CLASS_LOADED_BYTES:
916 return ClassLoadingService::loaded_shared_class_bytes();
917
918 case JMM_SHARED_CLASS_UNLOADED_BYTES:
919 return ClassLoadingService::unloaded_shared_class_bytes();
920
921 case JMM_TOTAL_CLASSLOAD_TIME_MS:
922 return ClassLoader::classloader_time_ms();
923
924 case JMM_VM_GLOBAL_COUNT:
925 return get_num_flags();
926
927 case JMM_SAFEPOINT_COUNT:
928 return RuntimeService::safepoint_count();
929
930 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
931 return RuntimeService::safepoint_sync_time_ms();
932
933 case JMM_TOTAL_STOPPED_TIME_MS:
934 return RuntimeService::safepoint_time_ms();
935
936 case JMM_TOTAL_APP_TIME_MS:
937 return RuntimeService::application_time_ms();
938
939 case JMM_VM_THREAD_COUNT:
940 return get_vm_thread_count();
941
942 case JMM_CLASS_INIT_TOTAL_COUNT:
943 return ClassLoader::class_init_count();
944
945 case JMM_CLASS_INIT_TOTAL_TIME_MS:
946 return ClassLoader::class_init_time_ms();
947
948 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
949 return ClassLoader::class_verify_time_ms();
950
951 case JMM_METHOD_DATA_SIZE_BYTES:
952 return ClassLoadingService::class_method_data_size();
953
954 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
955 return os::physical_memory();
956
957 default:
958 return -1;
959 }
960}
961
962
963// Returns the long value of a given attribute.
964JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
965 if (obj == NULL) {
966 return get_long_attribute(att);
967 } else {
968 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
969 if (mgr != NULL) {
970 return get_gc_attribute(mgr, att);
971 }
972 }
973 return -1;
974JVM_END
975
976// Gets the value of all attributes specified in the given array
977// and sets the value in the result array.
978// Returns the number of attributes found.
979JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
980 jobject obj,
981 jmmLongAttribute* atts,
982 jint count,
983 jlong* result))
984
985 int num_atts = 0;
986 if (obj == NULL) {
987 for (int i = 0; i < count; i++) {
988 result[i] = get_long_attribute(atts[i]);
989 if (result[i] != -1) {
990 num_atts++;
991 }
992 }
993 } else {
994 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
995 for (int i = 0; i < count; i++) {
996 result[i] = get_gc_attribute(mgr, atts[i]);
997 if (result[i] != -1) {
998 num_atts++;
999 }
1000 }
1001 }
1002 return num_atts;
1003JVM_END
1004
1005// Helper function to do thread dump for a specific list of threads
1006static void do_thread_dump(ThreadDumpResult* dump_result,
1007 typeArrayHandle ids_ah, // array of thread ID (long[])
1008 int num_threads,
1009 int max_depth,
1010 bool with_locked_monitors,
1011 bool with_locked_synchronizers,
1012 TRAPS) {
1013 // no need to actually perform thread dump if no TIDs are specified
1014 if (num_threads == 0) return;
1015
1016 // First get an array of threadObj handles.
1017 // A JavaThread may terminate before we get the stack trace.
1018 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1019
1020 {
1021 // Need this ThreadsListHandle for converting Java thread IDs into
1022 // threadObj handles; dump_result->set_t_list() is called in the
1023 // VM op below so we can't use it yet.
1024 ThreadsListHandle tlh;
1025 for (int i = 0; i < num_threads; i++) {
1026 jlong tid = ids_ah->long_at(i);
1027 JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1028 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1029 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1030 thread_handle_array->append(threadObj_h);
1031 }
1032 }
1033
1034 // Obtain thread dumps and thread snapshot information
1035 VM_ThreadDump op(dump_result,
1036 thread_handle_array,
1037 num_threads,
1038 max_depth, /* stack depth */
1039 with_locked_monitors,
1040 with_locked_synchronizers);
1041 VMThread::execute(&op);
1042}
1043
1044// Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1045// for the thread ID specified in the corresponding entry in
1046// the given array of thread IDs; or NULL if the thread does not exist
1047// or has terminated.
1048//
1049// Input parameters:
1050// ids - array of thread IDs
1051// maxDepth - the maximum depth of stack traces to be dumped:
1052// maxDepth == -1 requests to dump entire stack trace.
1053// maxDepth == 0 requests no stack trace.
1054// infoArray - array of ThreadInfo objects
1055//
1056// QQQ - Why does this method return a value instead of void?
1057JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1058 // Check if threads is null
1059 if (ids == NULL || infoArray == NULL) {
1060 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1061 }
1062
1063 if (maxDepth < -1) {
1064 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1065 "Invalid maxDepth", -1);
1066 }
1067
1068 ResourceMark rm(THREAD);
1069 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1070 typeArrayHandle ids_ah(THREAD, ta);
1071
1072 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1073 objArrayOop oa = objArrayOop(infoArray_obj);
1074 objArrayHandle infoArray_h(THREAD, oa);
1075
1076 // validate the thread id array
1077 validate_thread_id_array(ids_ah, CHECK_0);
1078
1079 // validate the ThreadInfo[] parameters
1080 validate_thread_info_array(infoArray_h, CHECK_0);
1081
1082 // infoArray must be of the same length as the given array of thread IDs
1083 int num_threads = ids_ah->length();
1084 if (num_threads != infoArray_h->length()) {
1085 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1086 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1087 }
1088
1089 // Must use ThreadDumpResult to store the ThreadSnapshot.
1090 // GC may occur after the thread snapshots are taken but before
1091 // this function returns. The threadObj and other oops kept
1092 // in the ThreadSnapshot are marked and adjusted during GC.
1093 ThreadDumpResult dump_result(num_threads);
1094
1095 if (maxDepth == 0) {
1096 // No stack trace to dump so we do not need to stop the world.
1097 // Since we never do the VM op here we must set the threads list.
1098 dump_result.set_t_list();
1099 for (int i = 0; i < num_threads; i++) {
1100 jlong tid = ids_ah->long_at(i);
1101 JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1102 if (jt == NULL) {
1103 // if the thread does not exist or now it is terminated,
1104 // create dummy snapshot
1105 dump_result.add_thread_snapshot();
1106 } else {
1107 dump_result.add_thread_snapshot(jt);
1108 }
1109 }
1110 } else {
1111 // obtain thread dump with the specific list of threads with stack trace
1112 do_thread_dump(&dump_result,
1113 ids_ah,
1114 num_threads,
1115 maxDepth,
1116 false, /* no locked monitor */
1117 false, /* no locked synchronizers */
1118 CHECK_0);
1119 }
1120
1121 int num_snapshots = dump_result.num_snapshots();
1122 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1123 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1124 int index = 0;
1125 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1126 // For each thread, create an java/lang/management/ThreadInfo object
1127 // and fill with the thread information
1128
1129 if (ts->threadObj() == NULL) {
1130 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1131 infoArray_h->obj_at_put(index, NULL);
1132 continue;
1133 }
1134
1135 // Create java.lang.management.ThreadInfo object
1136 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1137 infoArray_h->obj_at_put(index, info_obj);
1138 }
1139 return 0;
1140JVM_END
1141
1142// Dump thread info for the specified threads.
1143// It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1144// for the thread ID specified in the corresponding entry in
1145// the given array of thread IDs; or NULL if the thread does not exist
1146// or has terminated.
1147//
1148// Input parameter:
1149// ids - array of thread IDs; NULL indicates all live threads
1150// locked_monitors - if true, dump locked object monitors
1151// locked_synchronizers - if true, dump locked JSR-166 synchronizers
1152//
1153JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1154 jboolean locked_synchronizers, jint maxDepth))
1155 ResourceMark rm(THREAD);
1156
1157 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1158 int num_threads = (ta != NULL ? ta->length() : 0);
1159 typeArrayHandle ids_ah(THREAD, ta);
1160
1161 ThreadDumpResult dump_result(num_threads); // can safepoint
1162
1163 if (ids_ah() != NULL) {
1164
1165 // validate the thread id array
1166 validate_thread_id_array(ids_ah, CHECK_NULL);
1167
1168 // obtain thread dump of a specific list of threads
1169 do_thread_dump(&dump_result,
1170 ids_ah,
1171 num_threads,
1172 maxDepth, /* stack depth */
1173 (locked_monitors ? true : false), /* with locked monitors */
1174 (locked_synchronizers ? true : false), /* with locked synchronizers */
1175 CHECK_NULL);
1176 } else {
1177 // obtain thread dump of all threads
1178 VM_ThreadDump op(&dump_result,
1179 maxDepth, /* stack depth */
1180 (locked_monitors ? true : false), /* with locked monitors */
1181 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1182 VMThread::execute(&op);
1183 }
1184
1185 int num_snapshots = dump_result.num_snapshots();
1186 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1187
1188 // create the result ThreadInfo[] object
1189 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1190 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1191 objArrayHandle result_h(THREAD, r);
1192
1193 int index = 0;
1194 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1195 if (ts->threadObj() == NULL) {
1196 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1197 result_h->obj_at_put(index, NULL);
1198 continue;
1199 }
1200
1201 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1202 assert(stacktrace != NULL, "Must have a stack trace dumped");
1203
1204 // Create Object[] filled with locked monitors
1205 // Create int[] filled with the stack depth where a monitor was locked
1206 int num_frames = stacktrace->get_stack_depth();
1207 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1208
1209 // Count the total number of locked monitors
1210 for (int i = 0; i < num_frames; i++) {
1211 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1212 num_locked_monitors += frame->num_locked_monitors();
1213 }
1214
1215 objArrayHandle monitors_array;
1216 typeArrayHandle depths_array;
1217 objArrayHandle synchronizers_array;
1218
1219 if (locked_monitors) {
1220 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1221 // where the thread locked it
1222 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1223 objArrayHandle mh(THREAD, array);
1224 monitors_array = mh;
1225
1226 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1227 typeArrayHandle dh(THREAD, tarray);
1228 depths_array = dh;
1229
1230 int count = 0;
1231 int j = 0;
1232 for (int depth = 0; depth < num_frames; depth++) {
1233 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1234 int len = frame->num_locked_monitors();
1235 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1236 for (j = 0; j < len; j++) {
1237 oop monitor = locked_monitors->at(j);
1238 assert(monitor != NULL, "must be a Java object");
1239 monitors_array->obj_at_put(count, monitor);
1240 depths_array->int_at_put(count, depth);
1241 count++;
1242 }
1243 }
1244
1245 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1246 for (j = 0; j < jni_locked_monitors->length(); j++) {
1247 oop object = jni_locked_monitors->at(j);
1248 assert(object != NULL, "must be a Java object");
1249 monitors_array->obj_at_put(count, object);
1250 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1251 depths_array->int_at_put(count, -1);
1252 count++;
1253 }
1254 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1255 }
1256
1257 if (locked_synchronizers) {
1258 // Create Object[] filled with locked JSR-166 synchronizers
1259 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1260 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1261 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1262 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1263
1264 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1265 objArrayHandle sh(THREAD, array);
1266 synchronizers_array = sh;
1267
1268 for (int k = 0; k < num_locked_synchronizers; k++) {
1269 synchronizers_array->obj_at_put(k, locks->at(k));
1270 }
1271 }
1272
1273 // Create java.lang.management.ThreadInfo object
1274 instanceOop info_obj = Management::create_thread_info_instance(ts,
1275 monitors_array,
1276 depths_array,
1277 synchronizers_array,
1278 CHECK_NULL);
1279 result_h->obj_at_put(index, info_obj);
1280 }
1281
1282 return (jobjectArray) JNIHandles::make_local(env, result_h());
1283JVM_END
1284
1285// Reset statistic. Return true if the requested statistic is reset.
1286// Otherwise, return false.
1287//
1288// Input parameters:
1289// obj - specify which instance the statistic associated with to be reset
1290// For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1291// For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1292// type - the type of statistic to be reset
1293//
1294JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1295 ResourceMark rm(THREAD);
1296
1297 switch (type) {
1298 case JMM_STAT_PEAK_THREAD_COUNT:
1299 ThreadService::reset_peak_thread_count();
1300 return true;
1301
1302 case JMM_STAT_THREAD_CONTENTION_COUNT:
1303 case JMM_STAT_THREAD_CONTENTION_TIME: {
1304 jlong tid = obj.j;
1305 if (tid < 0) {
1306 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1307 }
1308
1309 // Look for the JavaThread of this given tid
1310 JavaThreadIteratorWithHandle jtiwh;
1311 if (tid == 0) {
1312 // reset contention statistics for all threads if tid == 0
1313 for (; JavaThread *java_thread = jtiwh.next(); ) {
1314 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1315 ThreadService::reset_contention_count_stat(java_thread);
1316 } else {
1317 ThreadService::reset_contention_time_stat(java_thread);
1318 }
1319 }
1320 } else {
1321 // reset contention statistics for a given thread
1322 JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1323 if (java_thread == NULL) {
1324 return false;
1325 }
1326
1327 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1328 ThreadService::reset_contention_count_stat(java_thread);
1329 } else {
1330 ThreadService::reset_contention_time_stat(java_thread);
1331 }
1332 }
1333 return true;
1334 break;
1335 }
1336 case JMM_STAT_PEAK_POOL_USAGE: {
1337 jobject o = obj.l;
1338 if (o == NULL) {
1339 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1340 }
1341
1342 oop pool_obj = JNIHandles::resolve(o);
1343 assert(pool_obj->is_instance(), "Should be an instanceOop");
1344 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1345
1346 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1347 if (pool != NULL) {
1348 pool->reset_peak_memory_usage();
1349 return true;
1350 }
1351 break;
1352 }
1353 case JMM_STAT_GC_STAT: {
1354 jobject o = obj.l;
1355 if (o == NULL) {
1356 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1357 }
1358
1359 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1360 if (mgr != NULL) {
1361 mgr->reset_gc_stat();
1362 return true;
1363 }
1364 break;
1365 }
1366 default:
1367 assert(0, "Unknown Statistic Type");
1368 }
1369 return false;
1370JVM_END
1371
1372// Returns the fast estimate of CPU time consumed by
1373// a given thread (in nanoseconds).
1374// If thread_id == 0, return CPU time for the current thread.
1375JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1376 if (!os::is_thread_cpu_time_supported()) {
1377 return -1;
1378 }
1379
1380 if (thread_id < 0) {
1381 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1382 "Invalid thread ID", -1);
1383 }
1384
1385 JavaThread* java_thread = NULL;
1386 if (thread_id == 0) {
1387 // current thread
1388 return os::current_thread_cpu_time();
1389 } else {
1390 ThreadsListHandle tlh;
1391 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1392 if (java_thread != NULL) {
1393 return os::thread_cpu_time((Thread*) java_thread);
1394 }
1395 }
1396 return -1;
1397JVM_END
1398
1399// Returns a String array of all VM global flag names
1400JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1401 // last flag entry is always NULL, so subtract 1
1402 int nFlags = (int) JVMFlag::numFlags - 1;
1403 // allocate a temp array
1404 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1405 nFlags, CHECK_0);
1406 objArrayHandle flags_ah(THREAD, r);
1407 int num_entries = 0;
1408 for (int i = 0; i < nFlags; i++) {
1409 JVMFlag* flag = &JVMFlag::flags[i];
1410 // Exclude notproduct and develop flags in product builds.
1411 if (flag->is_constant_in_binary()) {
1412 continue;
1413 }
1414 // Exclude the locked (experimental, diagnostic) flags
1415 if (flag->is_unlocked() || flag->is_unlocker()) {
1416 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1417 flags_ah->obj_at_put(num_entries, s());
1418 num_entries++;
1419 }
1420 }
1421
1422 if (num_entries < nFlags) {
1423 // Return array of right length
1424 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1425 for(int i = 0; i < num_entries; i++) {
1426 res->obj_at_put(i, flags_ah->obj_at(i));
1427 }
1428 return (jobjectArray)JNIHandles::make_local(env, res);
1429 }
1430
1431 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1432JVM_END
1433
1434// Utility function used by jmm_GetVMGlobals. Returns false if flag type
1435// can't be determined, true otherwise. If false is returned, then *global
1436// will be incomplete and invalid.
1437bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {
1438 Handle flag_name;
1439 if (name() == NULL) {
1440 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1441 } else {
1442 flag_name = name;
1443 }
1444 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1445
1446 if (flag->is_bool()) {
1447 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1448 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1449 } else if (flag->is_int()) {
1450 global->value.j = (jlong)flag->get_int();
1451 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1452 } else if (flag->is_uint()) {
1453 global->value.j = (jlong)flag->get_uint();
1454 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1455 } else if (flag->is_intx()) {
1456 global->value.j = (jlong)flag->get_intx();
1457 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1458 } else if (flag->is_uintx()) {
1459 global->value.j = (jlong)flag->get_uintx();
1460 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1461 } else if (flag->is_uint64_t()) {
1462 global->value.j = (jlong)flag->get_uint64_t();
1463 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1464 } else if (flag->is_double()) {
1465 global->value.d = (jdouble)flag->get_double();
1466 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1467 } else if (flag->is_size_t()) {
1468 global->value.j = (jlong)flag->get_size_t();
1469 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1470 } else if (flag->is_ccstr()) {
1471 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1472 global->value.l = (jobject)JNIHandles::make_local(env, str());
1473 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1474 } else {
1475 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1476 return false;
1477 }
1478
1479 global->writeable = flag->is_writeable();
1480 global->external = flag->is_external();
1481 switch (flag->get_origin()) {
1482 case JVMFlag::DEFAULT:
1483 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1484 break;
1485 case JVMFlag::COMMAND_LINE:
1486 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1487 break;
1488 case JVMFlag::ENVIRON_VAR:
1489 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1490 break;
1491 case JVMFlag::CONFIG_FILE:
1492 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1493 break;
1494 case JVMFlag::MANAGEMENT:
1495 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1496 break;
1497 case JVMFlag::ERGONOMIC:
1498 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1499 break;
1500 case JVMFlag::ATTACH_ON_DEMAND:
1501 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1502 break;
1503 default:
1504 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1505 }
1506
1507 return true;
1508}
1509
1510// Fill globals array of count length with jmmVMGlobal entries
1511// specified by names. If names == NULL, fill globals array
1512// with all Flags. Return value is number of entries
1513// created in globals.
1514// If a JVMFlag with a given name in an array element does not
1515// exist, globals[i].name will be set to NULL.
1516JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1517 jobjectArray names,
1518 jmmVMGlobal *globals,
1519 jint count))
1520
1521
1522 if (globals == NULL) {
1523 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1524 }
1525
1526 ResourceMark rm(THREAD);
1527
1528 if (names != NULL) {
1529 // return the requested globals
1530 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1531 objArrayHandle names_ah(THREAD, ta);
1532 // Make sure we have a String array
1533 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1534 if (element_klass != SystemDictionary::String_klass()) {
1535 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1536 "Array element type is not String class", 0);
1537 }
1538
1539 int names_length = names_ah->length();
1540 int num_entries = 0;
1541 for (int i = 0; i < names_length && i < count; i++) {
1542 oop s = names_ah->obj_at(i);
1543 if (s == NULL) {
1544 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1545 }
1546
1547 Handle sh(THREAD, s);
1548 char* str = java_lang_String::as_utf8_string(s);
1549 JVMFlag* flag = JVMFlag::find_flag(str, strlen(str));
1550 if (flag != NULL &&
1551 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1552 num_entries++;
1553 } else {
1554 globals[i].name = NULL;
1555 }
1556 }
1557 return num_entries;
1558 } else {
1559 // return all globals if names == NULL
1560
1561 // last flag entry is always NULL, so subtract 1
1562 int nFlags = (int) JVMFlag::numFlags - 1;
1563 Handle null_h;
1564 int num_entries = 0;
1565 for (int i = 0; i < nFlags && num_entries < count; i++) {
1566 JVMFlag* flag = &JVMFlag::flags[i];
1567 // Exclude notproduct and develop flags in product builds.
1568 if (flag->is_constant_in_binary()) {
1569 continue;
1570 }
1571 // Exclude the locked (diagnostic, experimental) flags
1572 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1573 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1574 num_entries++;
1575 }
1576 }
1577 return num_entries;
1578 }
1579JVM_END
1580
1581JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1582 ResourceMark rm(THREAD);
1583
1584 oop fn = JNIHandles::resolve_external_guard(flag_name);
1585 if (fn == NULL) {
1586 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1587 "The flag name cannot be null.");
1588 }
1589 char* name = java_lang_String::as_utf8_string(fn);
1590
1591 FormatBuffer<80> error_msg("%s", "");
1592 int succeed = WriteableFlags::set_flag(name, new_value, JVMFlag::MANAGEMENT, error_msg);
1593
1594 if (succeed != JVMFlag::SUCCESS) {
1595 if (succeed == JVMFlag::MISSING_VALUE) {
1596 // missing value causes NPE to be thrown
1597 THROW(vmSymbols::java_lang_NullPointerException());
1598 } else {
1599 // all the other errors are reported as IAE with the appropriate error message
1600 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1601 error_msg.buffer());
1602 }
1603 }
1604 assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1605JVM_END
1606
1607class ThreadTimesClosure: public ThreadClosure {
1608 private:
1609 objArrayHandle _names_strings;
1610 char **_names_chars;
1611 typeArrayHandle _times;
1612 int _names_len;
1613 int _times_len;
1614 int _count;
1615
1616 public:
1617 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1618 ~ThreadTimesClosure();
1619 virtual void do_thread(Thread* thread);
1620 void do_unlocked();
1621 int count() { return _count; }
1622};
1623
1624ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1625 typeArrayHandle times) {
1626 assert(names() != NULL, "names was NULL");
1627 assert(times() != NULL, "times was NULL");
1628 _names_strings = names;
1629 _names_len = names->length();
1630 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1631 _times = times;
1632 _times_len = times->length();
1633 _count = 0;
1634}
1635
1636//
1637// Called with Threads_lock held
1638//
1639void ThreadTimesClosure::do_thread(Thread* thread) {
1640 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
1641 assert(thread != NULL, "thread was NULL");
1642
1643 // exclude externally visible JavaThreads
1644 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1645 return;
1646 }
1647
1648 if (_count >= _names_len || _count >= _times_len) {
1649 // skip if the result array is not big enough
1650 return;
1651 }
1652
1653 EXCEPTION_MARK;
1654 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1655
1656 assert(thread->name() != NULL, "All threads should have a name");
1657 _names_chars[_count] = os::strdup(thread->name());
1658 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1659 os::thread_cpu_time(thread) : -1);
1660 _count++;
1661}
1662
1663// Called without Threads_lock, we can allocate String objects.
1664void ThreadTimesClosure::do_unlocked() {
1665
1666 EXCEPTION_MARK;
1667 for (int i = 0; i < _count; i++) {
1668 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1669 _names_strings->obj_at_put(i, s());
1670 }
1671}
1672
1673ThreadTimesClosure::~ThreadTimesClosure() {
1674 for (int i = 0; i < _count; i++) {
1675 os::free(_names_chars[i]);
1676 }
1677 FREE_C_HEAP_ARRAY(char *, _names_chars);
1678}
1679
1680// Fills names with VM internal thread names and times with the corresponding
1681// CPU times. If names or times is NULL, a NullPointerException is thrown.
1682// If the element type of names is not String, an IllegalArgumentException is
1683// thrown.
1684// If an array is not large enough to hold all the entries, only the entries
1685// that fit will be returned. Return value is the number of VM internal
1686// threads entries.
1687JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1688 jobjectArray names,
1689 jlongArray times))
1690 if (names == NULL || times == NULL) {
1691 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1692 }
1693 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1694 objArrayHandle names_ah(THREAD, na);
1695
1696 // Make sure we have a String array
1697 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1698 if (element_klass != SystemDictionary::String_klass()) {
1699 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1700 "Array element type is not String class", 0);
1701 }
1702
1703 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1704 typeArrayHandle times_ah(THREAD, ta);
1705
1706 ThreadTimesClosure ttc(names_ah, times_ah);
1707 {
1708 MutexLocker ml(Threads_lock);
1709 Threads::threads_do(&ttc);
1710 }
1711 ttc.do_unlocked();
1712 return ttc.count();
1713JVM_END
1714
1715static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1716 ResourceMark rm(THREAD);
1717
1718 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1719 VMThread::execute(&op);
1720
1721 DeadlockCycle* deadlocks = op.result();
1722 if (deadlocks == NULL) {
1723 // no deadlock found and return
1724 return Handle();
1725 }
1726
1727 int num_threads = 0;
1728 DeadlockCycle* cycle;
1729 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1730 num_threads += cycle->num_threads();
1731 }
1732
1733 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1734 objArrayHandle threads_ah(THREAD, r);
1735
1736 int index = 0;
1737 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1738 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1739 int len = deadlock_threads->length();
1740 for (int i = 0; i < len; i++) {
1741 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1742 index++;
1743 }
1744 }
1745 return threads_ah;
1746}
1747
1748// Finds cycles of threads that are deadlocked involved in object monitors
1749// and JSR-166 synchronizers.
1750// Returns an array of Thread objects which are in deadlock, if any.
1751// Otherwise, returns NULL.
1752//
1753// Input parameter:
1754// object_monitors_only - if true, only check object monitors
1755//
1756JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1757 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1758 return (jobjectArray) JNIHandles::make_local(env, result());
1759JVM_END
1760
1761// Finds cycles of threads that are deadlocked on monitor locks
1762// Returns an array of Thread objects which are in deadlock, if any.
1763// Otherwise, returns NULL.
1764JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1765 Handle result = find_deadlocks(true, CHECK_0);
1766 return (jobjectArray) JNIHandles::make_local(env, result());
1767JVM_END
1768
1769// Gets the information about GC extension attributes including
1770// the name of the attribute, its type, and a short description.
1771//
1772// Input parameters:
1773// mgr - GC memory manager
1774// info - caller allocated array of jmmExtAttributeInfo
1775// count - number of elements of the info array
1776//
1777// Returns the number of GC extension attributes filled in the info array; or
1778// -1 if info is not big enough
1779//
1780JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1781 // All GC memory managers have 1 attribute (number of GC threads)
1782 if (count == 0) {
1783 return 0;
1784 }
1785
1786 if (info == NULL) {
1787 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1788 }
1789
1790 info[0].name = "GcThreadCount";
1791 info[0].type = 'I';
1792 info[0].description = "Number of GC threads";
1793 return 1;
1794JVM_END
1795
1796// verify the given array is an array of java/lang/management/MemoryUsage objects
1797// of a given length and return the objArrayOop
1798static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1799 if (array == NULL) {
1800 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1801 }
1802
1803 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1804 objArrayHandle array_h(THREAD, oa);
1805
1806 // array must be of the given length
1807 if (length != array_h->length()) {
1808 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1809 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1810 }
1811
1812 // check if the element of array is of type MemoryUsage class
1813 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1814 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1815 if (element_klass != usage_klass) {
1816 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1817 "The element type is not MemoryUsage class", 0);
1818 }
1819
1820 return array_h();
1821}
1822
1823// Gets the statistics of the last GC of a given GC memory manager.
1824// Input parameters:
1825// obj - GarbageCollectorMXBean object
1826// gc_stat - caller allocated jmmGCStat where:
1827// a. before_gc_usage - array of MemoryUsage objects
1828// b. after_gc_usage - array of MemoryUsage objects
1829// c. gc_ext_attributes_values_size is set to the
1830// gc_ext_attribute_values array allocated
1831// d. gc_ext_attribute_values is a caller allocated array of jvalue.
1832//
1833// On return,
1834// gc_index == 0 indicates no GC statistics available
1835//
1836// before_gc_usage and after_gc_usage - filled with per memory pool
1837// before and after GC usage in the same order as the memory pools
1838// returned by GetMemoryPools for a given GC memory manager.
1839// num_gc_ext_attributes indicates the number of elements in
1840// the gc_ext_attribute_values array is filled; or
1841// -1 if the gc_ext_attributes_values array is not big enough
1842//
1843JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1844 ResourceMark rm(THREAD);
1845
1846 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1847 THROW(vmSymbols::java_lang_NullPointerException());
1848 }
1849
1850 // Get the GCMemoryManager
1851 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1852
1853 // Make a copy of the last GC statistics
1854 // GC may occur while constructing the last GC information
1855 int num_pools = MemoryService::num_memory_pools();
1856 GCStatInfo stat(num_pools);
1857 if (mgr->get_last_gc_stat(&stat) == 0) {
1858 gc_stat->gc_index = 0;
1859 return;
1860 }
1861
1862 gc_stat->gc_index = stat.gc_index();
1863 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1864 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1865
1866 // Current implementation does not have GC extension attributes
1867 gc_stat->num_gc_ext_attributes = 0;
1868
1869 // Fill the arrays of MemoryUsage objects with before and after GC
1870 // per pool memory usage
1871 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1872 num_pools,
1873 CHECK);
1874 objArrayHandle usage_before_gc_ah(THREAD, bu);
1875
1876 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1877 num_pools,
1878 CHECK);
1879 objArrayHandle usage_after_gc_ah(THREAD, au);
1880
1881 for (int i = 0; i < num_pools; i++) {
1882 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1883 Handle after_usage;
1884
1885 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1886 if (u.max_size() == 0 && u.used() > 0) {
1887 // If max size == 0, this pool is a survivor space.
1888 // Set max size = -1 since the pools will be swapped after GC.
1889 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1890 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1891 } else {
1892 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1893 }
1894 usage_before_gc_ah->obj_at_put(i, before_usage());
1895 usage_after_gc_ah->obj_at_put(i, after_usage());
1896 }
1897
1898 if (gc_stat->gc_ext_attribute_values_size > 0) {
1899 // Current implementation only has 1 attribute (number of GC threads)
1900 // The type is 'I'
1901 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1902 }
1903JVM_END
1904
1905JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1906 ResourceMark rm(THREAD);
1907 // Get the GCMemoryManager
1908 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1909 mgr->set_notification_enabled(enabled?true:false);
1910JVM_END
1911
1912// Dump heap - Returns 0 if succeeds.
1913JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1914#if INCLUDE_SERVICES
1915 ResourceMark rm(THREAD);
1916 oop on = JNIHandles::resolve_external_guard(outputfile);
1917 if (on == NULL) {
1918 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1919 "Output file name cannot be null.", -1);
1920 }
1921 Handle onhandle(THREAD, on);
1922 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1923 if (name == NULL) {
1924 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1925 "Output file name cannot be null.", -1);
1926 }
1927 HeapDumper dumper(live ? true : false);
1928 if (dumper.dump(name) != 0) {
1929 const char* errmsg = dumper.error_as_C_string();
1930 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1931 }
1932 return 0;
1933#else // INCLUDE_SERVICES
1934 return -1;
1935#endif // INCLUDE_SERVICES
1936JVM_END
1937
1938JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1939 ResourceMark rm(THREAD);
1940 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1941 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1942 dcmd_list->length(), CHECK_NULL);
1943 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1944 for (int i = 0; i < dcmd_list->length(); i++) {
1945 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1946 cmd_array->obj_at_put(i, cmd_name);
1947 }
1948 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1949JVM_END
1950
1951JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1952 dcmdInfo* infoArray))
1953 if (cmds == NULL || infoArray == NULL) {
1954 THROW(vmSymbols::java_lang_NullPointerException());
1955 }
1956
1957 ResourceMark rm(THREAD);
1958
1959 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1960 objArrayHandle cmds_ah(THREAD, ca);
1961
1962 // Make sure we have a String array
1963 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1964 if (element_klass != SystemDictionary::String_klass()) {
1965 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1966 "Array element type is not String class");
1967 }
1968
1969 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1970
1971 int num_cmds = cmds_ah->length();
1972 for (int i = 0; i < num_cmds; i++) {
1973 oop cmd = cmds_ah->obj_at(i);
1974 if (cmd == NULL) {
1975 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1976 "Command name cannot be null.");
1977 }
1978 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1979 if (cmd_name == NULL) {
1980 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1981 "Command name cannot be null.");
1982 }
1983 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
1984 if (pos == -1) {
1985 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1986 "Unknown diagnostic command");
1987 }
1988 DCmdInfo* info = info_list->at(pos);
1989 infoArray[i].name = info->name();
1990 infoArray[i].description = info->description();
1991 infoArray[i].impact = info->impact();
1992 JavaPermission p = info->permission();
1993 infoArray[i].permission_class = p._class;
1994 infoArray[i].permission_name = p._name;
1995 infoArray[i].permission_action = p._action;
1996 infoArray[i].num_arguments = info->num_arguments();
1997 infoArray[i].enabled = info->is_enabled();
1998 }
1999JVM_END
2000
2001JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2002 jstring command, dcmdArgInfo* infoArray))
2003 ResourceMark rm(THREAD);
2004 oop cmd = JNIHandles::resolve_external_guard(command);
2005 if (cmd == NULL) {
2006 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2007 "Command line cannot be null.");
2008 }
2009 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2010 if (cmd_name == NULL) {
2011 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2012 "Command line content cannot be null.");
2013 }
2014 DCmd* dcmd = NULL;
2015 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2016 strlen(cmd_name));
2017 if (factory != NULL) {
2018 dcmd = factory->create_resource_instance(NULL);
2019 }
2020 if (dcmd == NULL) {
2021 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2022 "Unknown diagnostic command");
2023 }
2024 DCmdMark mark(dcmd);
2025 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2026 if (array->length() == 0) {
2027 return;
2028 }
2029 for (int i = 0; i < array->length(); i++) {
2030 infoArray[i].name = array->at(i)->name();
2031 infoArray[i].description = array->at(i)->description();
2032 infoArray[i].type = array->at(i)->type();
2033 infoArray[i].default_string = array->at(i)->default_string();
2034 infoArray[i].mandatory = array->at(i)->is_mandatory();
2035 infoArray[i].option = array->at(i)->is_option();
2036 infoArray[i].multiple = array->at(i)->is_multiple();
2037 infoArray[i].position = array->at(i)->position();
2038 }
2039 return;
2040JVM_END
2041
2042JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2043 ResourceMark rm(THREAD);
2044 oop cmd = JNIHandles::resolve_external_guard(commandline);
2045 if (cmd == NULL) {
2046 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2047 "Command line cannot be null.");
2048 }
2049 char* cmdline = java_lang_String::as_utf8_string(cmd);
2050 if (cmdline == NULL) {
2051 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2052 "Command line content cannot be null.");
2053 }
2054 bufferedStream output;
2055 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2056 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2057 return (jstring) JNIHandles::make_local(env, result);
2058JVM_END
2059
2060JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2061 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2062JVM_END
2063
2064jlong Management::ticks_to_ms(jlong ticks) {
2065 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2066 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2067 * (double)1000.0);
2068}
2069#endif // INCLUDE_MANAGEMENT
2070
2071// Gets an array containing the amount of memory allocated on the Java
2072// heap for a set of threads (in bytes). Each element of the array is
2073// the amount of memory allocated for the thread ID specified in the
2074// corresponding entry in the given array of thread IDs; or -1 if the
2075// thread does not exist or has terminated.
2076JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2077 jlongArray sizeArray))
2078 // Check if threads is null
2079 if (ids == NULL || sizeArray == NULL) {
2080 THROW(vmSymbols::java_lang_NullPointerException());
2081 }
2082
2083 ResourceMark rm(THREAD);
2084 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2085 typeArrayHandle ids_ah(THREAD, ta);
2086
2087 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2088 typeArrayHandle sizeArray_h(THREAD, sa);
2089
2090 // validate the thread id array
2091 validate_thread_id_array(ids_ah, CHECK);
2092
2093 // sizeArray must be of the same length as the given array of thread IDs
2094 int num_threads = ids_ah->length();
2095 if (num_threads != sizeArray_h->length()) {
2096 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2097 "The length of the given long array does not match the length of "
2098 "the given array of thread IDs");
2099 }
2100
2101 ThreadsListHandle tlh;
2102 for (int i = 0; i < num_threads; i++) {
2103 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2104 if (java_thread != NULL) {
2105 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2106 }
2107 }
2108JVM_END
2109
2110// Returns the CPU time consumed by a given thread (in nanoseconds).
2111// If thread_id == 0, CPU time for the current thread is returned.
2112// If user_sys_cpu_time = true, user level and system CPU time of
2113// a given thread is returned; otherwise, only user level CPU time
2114// is returned.
2115JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2116 if (!os::is_thread_cpu_time_supported()) {
2117 return -1;
2118 }
2119
2120 if (thread_id < 0) {
2121 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2122 "Invalid thread ID", -1);
2123 }
2124
2125 JavaThread* java_thread = NULL;
2126 if (thread_id == 0) {
2127 // current thread
2128 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2129 } else {
2130 ThreadsListHandle tlh;
2131 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2132 if (java_thread != NULL) {
2133 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2134 }
2135 }
2136 return -1;
2137JVM_END
2138
2139// Gets an array containing the CPU times consumed by a set of threads
2140// (in nanoseconds). Each element of the array is the CPU time for the
2141// thread ID specified in the corresponding entry in the given array
2142// of thread IDs; or -1 if the thread does not exist or has terminated.
2143// If user_sys_cpu_time = true, the sum of user level and system CPU time
2144// for the given thread is returned; otherwise, only user level CPU time
2145// is returned.
2146JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2147 jlongArray timeArray,
2148 jboolean user_sys_cpu_time))
2149 // Check if threads is null
2150 if (ids == NULL || timeArray == NULL) {
2151 THROW(vmSymbols::java_lang_NullPointerException());
2152 }
2153
2154 ResourceMark rm(THREAD);
2155 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2156 typeArrayHandle ids_ah(THREAD, ta);
2157
2158 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2159 typeArrayHandle timeArray_h(THREAD, tia);
2160
2161 // validate the thread id array
2162 validate_thread_id_array(ids_ah, CHECK);
2163
2164 // timeArray must be of the same length as the given array of thread IDs
2165 int num_threads = ids_ah->length();
2166 if (num_threads != timeArray_h->length()) {
2167 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2168 "The length of the given long array does not match the length of "
2169 "the given array of thread IDs");
2170 }
2171
2172 ThreadsListHandle tlh;
2173 for (int i = 0; i < num_threads; i++) {
2174 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2175 if (java_thread != NULL) {
2176 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2177 user_sys_cpu_time != 0));
2178 }
2179 }
2180JVM_END
2181
2182
2183
2184#if INCLUDE_MANAGEMENT
2185const struct jmmInterface_1_ jmm_interface = {
2186 NULL,
2187 NULL,
2188 jmm_GetVersion,
2189 jmm_GetOptionalSupport,
2190 jmm_GetThreadInfo,
2191 jmm_GetMemoryPools,
2192 jmm_GetMemoryManagers,
2193 jmm_GetMemoryPoolUsage,
2194 jmm_GetPeakMemoryPoolUsage,
2195 jmm_GetThreadAllocatedMemory,
2196 jmm_GetMemoryUsage,
2197 jmm_GetLongAttribute,
2198 jmm_GetBoolAttribute,
2199 jmm_SetBoolAttribute,
2200 jmm_GetLongAttributes,
2201 jmm_FindMonitorDeadlockedThreads,
2202 jmm_GetThreadCpuTime,
2203 jmm_GetVMGlobalNames,
2204 jmm_GetVMGlobals,
2205 jmm_GetInternalThreadTimes,
2206 jmm_ResetStatistic,
2207 jmm_SetPoolSensor,
2208 jmm_SetPoolThreshold,
2209 jmm_GetPoolCollectionUsage,
2210 jmm_GetGCExtAttributeInfo,
2211 jmm_GetLastGCStat,
2212 jmm_GetThreadCpuTimeWithKind,
2213 jmm_GetThreadCpuTimesWithKind,
2214 jmm_DumpHeap0,
2215 jmm_FindDeadlockedThreads,
2216 jmm_SetVMGlobal,
2217 NULL,
2218 jmm_DumpThreads,
2219 jmm_SetGCNotificationEnabled,
2220 jmm_GetDiagnosticCommands,
2221 jmm_GetDiagnosticCommandInfo,
2222 jmm_GetDiagnosticCommandArgumentsInfo,
2223 jmm_ExecuteDiagnosticCommand,
2224 jmm_SetDiagnosticFrameworkNotificationEnabled
2225};
2226#endif // INCLUDE_MANAGEMENT
2227
2228void* Management::get_jmm_interface(int version) {
2229#if INCLUDE_MANAGEMENT
2230 if (version == JMM_VERSION) {
2231 return (void*) &jmm_interface;
2232 }
2233#endif // INCLUDE_MANAGEMENT
2234 return NULL;
2235}
2236