2
* Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
3
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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.
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
25
#include "precompiled.hpp"
26
#include "classfile/classLoader.hpp"
27
#include "classfile/systemDictionary.hpp"
28
#include "classfile/vmClasses.hpp"
29
#include "compiler/compileBroker.hpp"
30
#include "gc/shared/collectedHeap.hpp"
32
#include "memory/allocation.inline.hpp"
33
#include "memory/iterator.hpp"
34
#include "memory/oopFactory.hpp"
35
#include "memory/resourceArea.hpp"
36
#include "memory/universe.hpp"
37
#include "oops/klass.hpp"
38
#include "oops/klass.inline.hpp"
39
#include "oops/objArrayKlass.hpp"
40
#include "oops/objArrayOop.inline.hpp"
41
#include "oops/oop.inline.hpp"
42
#include "oops/oopHandle.inline.hpp"
43
#include "oops/typeArrayOop.inline.hpp"
44
#include "runtime/flags/jvmFlag.hpp"
45
#include "runtime/globals.hpp"
46
#include "runtime/handles.inline.hpp"
47
#include "runtime/interfaceSupport.inline.hpp"
48
#include "runtime/javaCalls.hpp"
49
#include "runtime/jniHandles.inline.hpp"
50
#include "runtime/mutexLocker.hpp"
51
#include "runtime/notificationThread.hpp"
52
#include "runtime/os.hpp"
53
#include "runtime/thread.inline.hpp"
54
#include "runtime/threads.hpp"
55
#include "runtime/threadSMR.hpp"
56
#include "runtime/vmOperations.hpp"
57
#include "services/classLoadingService.hpp"
58
#include "services/diagnosticCommand.hpp"
59
#include "services/diagnosticFramework.hpp"
60
#include "services/finalizerService.hpp"
61
#include "services/writeableFlags.hpp"
62
#include "services/heapDumper.hpp"
63
#include "services/lowMemoryDetector.hpp"
64
#include "services/gcNotifier.hpp"
65
#include "services/management.hpp"
66
#include "services/memoryManager.hpp"
67
#include "services/memoryPool.hpp"
68
#include "services/memoryService.hpp"
69
#include "services/runtimeService.hpp"
70
#include "services/threadService.hpp"
71
#include "utilities/debug.hpp"
72
#include "utilities/formatBuffer.hpp"
73
#include "utilities/macros.hpp"
75
PerfVariable* Management::_begin_vm_creation_time = nullptr;
76
PerfVariable* Management::_end_vm_creation_time = nullptr;
77
PerfVariable* Management::_vm_init_done_time = nullptr;
79
InstanceKlass* Management::_diagnosticCommandImpl_klass = nullptr;
80
InstanceKlass* Management::_garbageCollectorExtImpl_klass = nullptr;
81
InstanceKlass* Management::_garbageCollectorMXBean_klass = nullptr;
82
InstanceKlass* Management::_gcInfo_klass = nullptr;
83
InstanceKlass* Management::_managementFactoryHelper_klass = nullptr;
84
InstanceKlass* Management::_memoryManagerMXBean_klass = nullptr;
85
InstanceKlass* Management::_memoryPoolMXBean_klass = nullptr;
86
InstanceKlass* Management::_memoryUsage_klass = nullptr;
87
InstanceKlass* Management::_sensor_klass = nullptr;
88
InstanceKlass* Management::_threadInfo_klass = nullptr;
90
jmmOptionalSupport Management::_optional_support = {0};91
TimeStamp Management::_stamp;
93
void management_init() {96
ThreadService::init();
97
RuntimeService::init();
98
ClassLoadingService::init();
99
FinalizerService::init();
101
ThreadService::init();
102
#endif // INCLUDE_MANAGEMENT
105
#if INCLUDE_MANAGEMENT
107
void Management::init() {110
// These counters are for java.lang.management API support.
111
// They are created even if -XX:-UsePerfData is set and in
112
// that case, they will be allocated on C heap.
114
_begin_vm_creation_time =
115
PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
116
PerfData::U_None, CHECK);
118
_end_vm_creation_time =
119
PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
120
PerfData::U_None, CHECK);
123
PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
124
PerfData::U_None, CHECK);
126
// Initialize optional support
127
_optional_support.isLowMemoryDetectionSupported = 1;
128
_optional_support.isCompilationTimeMonitoringSupported = 1;
129
_optional_support.isThreadContentionMonitoringSupported = 1;
131
if (os::is_thread_cpu_time_supported()) {132
_optional_support.isCurrentThreadCpuTimeSupported = 1;
133
_optional_support.isOtherThreadCpuTimeSupported = 1;
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_optional_support.isCurrentThreadCpuTimeSupported = 0;
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_optional_support.isOtherThreadCpuTimeSupported = 0;
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_optional_support.isObjectMonitorUsageSupported = 1;
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// This depends on the heap inspector
142
_optional_support.isSynchronizerUsageSupported = 1;
143
#endif // INCLUDE_SERVICES
144
_optional_support.isThreadAllocatedMemorySupported = 1;
145
_optional_support.isRemoteDiagnosticCommandsSupported = 1;
147
// Registration of the diagnostic commands
148
DCmd::register_dcmds();
151
void Management::initialize(TRAPS) {152
if (UseNotificationThread) {153
NotificationThread::initialize();
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if (ManagementServer) {156
ResourceMark rm(THREAD);
157
HandleMark hm(THREAD);
159
// Load and initialize the jdk.internal.agent.Agent class
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// invoke startAgent method to start the management server
161
Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
162
Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
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vm_exit_during_initialization("Management agent initialization failure: "168
"class jdk.internal.agent.Agent not found.");
171
JavaValue result(T_VOID);
172
JavaCalls::call_static(&result,
174
vmSymbols::startAgent_name(),
175
vmSymbols::void_method_signature(),
180
void Management::get_optional_support(jmmOptionalSupport* support) {181
memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
184
InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {185
Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
186
return initialize_klass(k, THREAD);
189
InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {190
Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
194
return initialize_klass(k, THREAD);
197
InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {198
InstanceKlass* ik = InstanceKlass::cast(k);
199
if (ik->should_be_initialized()) {200
ik->initialize(CHECK_NULL);
202
// If these classes change to not be owned by the boot loader, they need
203
// to be walked to keep their class loader alive in oops_do.
204
assert(ik->class_loader() == nullptr, "need to follow in oops_do");
209
void Management::record_vm_init_completed() {210
// Initialize the timestamp to get the current time
211
_vm_init_done_time->set_value(os::javaTimeMillis());
213
// Update the timestamp to the vm init done time
217
void Management::record_vm_startup_time(jlong begin, jlong duration) {218
// if the performance counter is not initialized,
219
// then vm initialization failed; simply return.
220
if (_begin_vm_creation_time == nullptr) return;
222
_begin_vm_creation_time->set_value(begin);
223
_end_vm_creation_time->set_value(begin + duration);
224
PerfMemory::set_accessible(true);
227
jlong Management::begin_vm_creation_time() {228
return _begin_vm_creation_time->get_value();
231
jlong Management::vm_init_done_time() {232
return _vm_init_done_time->get_value();
235
jlong Management::timestamp() {238
return t.ticks() - _stamp.ticks();
241
InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {242
if (_threadInfo_klass == nullptr) {243
_threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
245
return _threadInfo_klass;
248
InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {249
if (_memoryUsage_klass == nullptr) {250
_memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
252
return _memoryUsage_klass;
255
InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {256
if (_memoryPoolMXBean_klass == nullptr) {257
_memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
259
return _memoryPoolMXBean_klass;
262
InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {263
if (_memoryManagerMXBean_klass == nullptr) {264
_memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
266
return _memoryManagerMXBean_klass;
269
InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {270
if (_garbageCollectorMXBean_klass == nullptr) {271
_garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
273
return _garbageCollectorMXBean_klass;
276
InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {277
if (_sensor_klass == nullptr) {278
_sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
280
return _sensor_klass;
283
InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {284
if (_managementFactoryHelper_klass == nullptr) {285
_managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
287
return _managementFactoryHelper_klass;
290
InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {291
if (_garbageCollectorExtImpl_klass == nullptr) {292
_garbageCollectorExtImpl_klass =
293
load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
295
return _garbageCollectorExtImpl_klass;
298
InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {299
if (_gcInfo_klass == nullptr) {300
_gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
302
return _gcInfo_klass;
305
InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {306
if (_diagnosticCommandImpl_klass == nullptr) {307
_diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
309
return _diagnosticCommandImpl_klass;
312
static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {313
Handle snapshot_thread(THREAD, snapshot->threadObj());
315
jlong contended_time;
317
if (ThreadService::is_thread_monitoring_contention()) {318
contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
319
waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
321
// set them to -1 if thread contention monitoring is disabled.
322
contended_time = max_julong;
323
waited_time = max_julong;
326
int thread_status = static_cast<int>(snapshot->thread_status());
327
assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
328
if (snapshot->is_suspended()) {329
thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
331
if (snapshot->is_in_native()) {332
thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
335
ThreadStackTrace* st = snapshot->get_stack_trace();
338
stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
340
stacktrace_h = Handle();
343
args->push_oop(snapshot_thread);
344
args->push_int(thread_status);
345
args->push_oop(Handle(THREAD, snapshot->blocker_object()));
346
args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
347
args->push_long(snapshot->contended_enter_count());
348
args->push_long(contended_time);
349
args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
350
args->push_long(waited_time);
351
args->push_oop(stacktrace_h);
354
// Helper function to construct a ThreadInfo object
355
instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {356
InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
357
JavaCallArguments args(14);
359
// initialize the arguments for the ThreadInfo constructor
360
initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
362
// Call ThreadInfo constructor with no locked monitors and synchronizers
363
Handle element = JavaCalls::construct_new_instance(
365
vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
368
return (instanceOop) element();
371
instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
372
objArrayHandle monitors_array,
373
typeArrayHandle depths_array,
374
objArrayHandle synchronizers_array,
376
InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
377
JavaCallArguments args(17);
379
// initialize the arguments for the ThreadInfo constructor
380
initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
382
// push the locked monitors and synchronizers in the arguments
383
args.push_oop(monitors_array);
384
args.push_oop(depths_array);
385
args.push_oop(synchronizers_array);
387
// Call ThreadInfo constructor with locked monitors and synchronizers
388
Handle element = JavaCalls::construct_new_instance(
390
vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
393
return (instanceOop) element();
397
static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {398
if (mgr == nullptr) {399
THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
401
oop mgr_obj = JNIHandles::resolve(mgr);
402
instanceHandle h(THREAD, (instanceOop) mgr_obj);
404
InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
406
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
407
"the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
411
MemoryManager* gc = MemoryService::get_memory_manager(h);
412
if (gc == nullptr || !gc->is_gc_memory_manager()) {413
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
414
"Invalid GC memory manager",
417
return (GCMemoryManager*) gc;
420
static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {421
if (obj == nullptr) {422
THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
425
oop pool_obj = JNIHandles::resolve(obj);
426
assert(pool_obj->is_instance(), "Should be an instanceOop");
427
instanceHandle ph(THREAD, (instanceOop) pool_obj);
429
return MemoryService::get_memory_pool(ph);
432
static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {433
int num_threads = ids_ah->length();
435
// Validate input thread IDs
437
for (i = 0; i < num_threads; i++) {438
jlong tid = ids_ah->long_at(i);
440
// throw exception if invalid thread id.
441
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
442
"Invalid thread ID entry");
447
// Returns true if the JavaThread's Java object is a platform thread
448
static bool is_platform_thread(JavaThread* jt) {450
oop thread_obj = jt->threadObj();
451
return (thread_obj != nullptr) && !thread_obj->is_a(vmClasses::BoundVirtualThread_klass());
457
static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {458
// check if the element of infoArray is of type ThreadInfo class
459
Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
460
Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
461
if (element_klass != threadinfo_klass) {462
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
463
"infoArray element type is not ThreadInfo class");
467
// Returns true if the ThreadSnapshot's Java object is a platform thread
468
static bool is_platform_thread(ThreadSnapshot* ts) {469
oop thread_obj = ts->threadObj();
470
return (thread_obj != nullptr) && !thread_obj->is_a(vmClasses::BoundVirtualThread_klass());
473
static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {474
if (obj == nullptr) {475
THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
478
oop mgr_obj = JNIHandles::resolve(obj);
479
assert(mgr_obj->is_instance(), "Should be an instanceOop");
480
instanceHandle mh(THREAD, (instanceOop) mgr_obj);
482
return MemoryService::get_memory_manager(mh);
485
// Returns a version string and sets major and minor version if
486
// the input parameters are non-null.
487
JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
491
// Gets the list of VM monitoring and management optional supports
492
// Returns 0 if succeeded; otherwise returns non-zero.
493
JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
494
if (support == nullptr) {497
Management::get_optional_support(support);
501
// Returns an array of java/lang/management/MemoryPoolMXBean object
502
// one for each memory pool if obj == null; otherwise returns
503
// an array of memory pools for a given memory manager if
504
// it is a valid memory manager.
505
JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
506
ResourceMark rm(THREAD);
508
int num_memory_pools;
509
MemoryManager* mgr = nullptr;
510
if (obj == nullptr) {511
num_memory_pools = MemoryService::num_memory_pools();
513
mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
514
if (mgr == nullptr) {517
num_memory_pools = mgr->num_memory_pools();
520
// Allocate the resulting MemoryPoolMXBean[] object
521
InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
522
objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
523
objArrayHandle poolArray(THREAD, r);
525
if (mgr == nullptr) {526
// Get all memory pools
527
for (int i = 0; i < num_memory_pools; i++) {528
MemoryPool* pool = MemoryService::get_memory_pool(i);
529
instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
530
instanceHandle ph(THREAD, p);
531
poolArray->obj_at_put(i, ph());
534
// Get memory pools managed by a given memory manager
535
for (int i = 0; i < num_memory_pools; i++) {536
MemoryPool* pool = mgr->get_memory_pool(i);
537
instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
538
instanceHandle ph(THREAD, p);
539
poolArray->obj_at_put(i, ph());
542
return (jobjectArray) JNIHandles::make_local(THREAD, poolArray());
545
// Returns an array of java/lang/management/MemoryManagerMXBean object
546
// one for each memory manager if obj == null; otherwise returns
547
// an array of memory managers for a given memory pool if
548
// it is a valid memory pool.
549
JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
550
ResourceMark rm(THREAD);
553
MemoryPool* pool = nullptr;
554
if (obj == nullptr) {555
num_mgrs = MemoryService::num_memory_managers();
557
pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
558
if (pool == nullptr) {561
num_mgrs = pool->num_memory_managers();
564
// Allocate the resulting MemoryManagerMXBean[] object
565
InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
566
objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
567
objArrayHandle mgrArray(THREAD, r);
569
if (pool == nullptr) {570
// Get all memory managers
571
for (int i = 0; i < num_mgrs; i++) {572
MemoryManager* mgr = MemoryService::get_memory_manager(i);
573
instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
574
instanceHandle ph(THREAD, p);
575
mgrArray->obj_at_put(i, ph());
578
// Get memory managers for a given memory pool
579
for (int i = 0; i < num_mgrs; i++) {580
MemoryManager* mgr = pool->get_memory_manager(i);
581
instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
582
instanceHandle ph(THREAD, p);
583
mgrArray->obj_at_put(i, ph());
586
return (jobjectArray) JNIHandles::make_local(THREAD, mgrArray());
590
// Returns a java/lang/management/MemoryUsage object containing the memory usage
591
// of a given memory pool.
592
JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
593
ResourceMark rm(THREAD);
595
MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
596
if (pool != nullptr) {597
MemoryUsage usage = pool->get_memory_usage();
598
Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
599
return JNIHandles::make_local(THREAD, h());
605
// Returns a java/lang/management/MemoryUsage object containing the memory usage
606
// of a given memory pool.
607
JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
608
ResourceMark rm(THREAD);
610
MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
611
if (pool != nullptr) {612
MemoryUsage usage = pool->get_peak_memory_usage();
613
Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
614
return JNIHandles::make_local(THREAD, h());
620
// Returns a java/lang/management/MemoryUsage object containing the memory usage
621
// of a given memory pool after most recent GC.
622
JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
623
ResourceMark rm(THREAD);
625
MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
626
if (pool != nullptr && pool->is_collected_pool()) {627
MemoryUsage usage = pool->get_last_collection_usage();
628
Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
629
return JNIHandles::make_local(THREAD, h());
635
// Sets the memory pool sensor for a threshold type
636
JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
637
if (obj == nullptr || sensorObj == nullptr) {638
THROW(vmSymbols::java_lang_NullPointerException());
641
InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
642
oop s = JNIHandles::resolve(sensorObj);
643
assert(s->is_instance(), "Sensor should be an instanceOop");
644
instanceHandle sensor_h(THREAD, (instanceOop) s);
645
if (!sensor_h->is_a(sensor_klass)) {646
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
647
"Sensor is not an instance of sun.management.Sensor class");
650
MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
651
assert(mpool != nullptr, "MemoryPool should exist");
654
case JMM_USAGE_THRESHOLD_HIGH:
655
case JMM_USAGE_THRESHOLD_LOW:
656
// have only one sensor for threshold high and low
657
mpool->set_usage_sensor_obj(sensor_h);
659
case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
660
case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
661
// have only one sensor for threshold high and low
662
mpool->set_gc_usage_sensor_obj(sensor_h);
665
assert(false, "Unrecognized type");
671
// Sets the threshold of a given memory pool.
672
// Returns the previous threshold.
675
// pool - the MemoryPoolMXBean object
676
// type - threshold type
677
// threshold - the new threshold (must not be negative)
679
JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
681
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
682
"Invalid threshold value",
686
if ((size_t)threshold > max_uintx) {688
st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);689
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
692
MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
693
assert(pool != nullptr, "MemoryPool should exist");
697
case JMM_USAGE_THRESHOLD_HIGH:
698
if (!pool->usage_threshold()->is_high_threshold_supported()) {701
prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
704
case JMM_USAGE_THRESHOLD_LOW:
705
if (!pool->usage_threshold()->is_low_threshold_supported()) {708
prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
711
case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
712
if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {715
// return and the new threshold is effective for the next GC
716
return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
718
case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
719
if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {722
// return and the new threshold is effective for the next GC
723
return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
726
assert(false, "Unrecognized type");
730
// When the threshold is changed, reevaluate if the low memory
731
// detection is enabled.
732
if (prev != threshold) {733
LowMemoryDetector::recompute_enabled_for_collected_pools();
734
LowMemoryDetector::detect_low_memory(pool);
739
// Returns a java/lang/management/MemoryUsage object representing
740
// the memory usage for the heap or non-heap memory.
741
JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
742
ResourceMark rm(THREAD);
747
usage = Universe::heap()->memory_usage();
749
// Calculate the memory usage by summing up the pools.
750
size_t total_init = 0;
751
size_t total_used = 0;
752
size_t total_committed = 0;
753
size_t total_max = 0;
754
bool has_undefined_init_size = false;
755
bool has_undefined_max_size = false;
757
for (int i = 0; i < MemoryService::num_memory_pools(); i++) {758
MemoryPool* pool = MemoryService::get_memory_pool(i);
759
if (pool->is_non_heap()) {760
MemoryUsage u = pool->get_memory_usage();
761
total_used += u.used();
762
total_committed += u.committed();
764
if (u.init_size() == MemoryUsage::undefined_size()) {765
has_undefined_init_size = true;
767
if (!has_undefined_init_size) {768
total_init += u.init_size();
771
if (u.max_size() == MemoryUsage::undefined_size()) {772
has_undefined_max_size = true;
774
if (!has_undefined_max_size) {775
total_max += u.max_size();
780
// if any one of the memory pool has undefined init_size or max_size,
781
// set it to MemoryUsage::undefined_size()
782
if (has_undefined_init_size) {783
total_init = MemoryUsage::undefined_size();
785
if (has_undefined_max_size) {786
total_max = MemoryUsage::undefined_size();
789
usage = MemoryUsage(total_init, total_used, total_committed, total_max);
792
Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
793
return JNIHandles::make_local(THREAD, obj());
796
// Returns the boolean value of a given attribute.
797
JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
800
return MemoryService::get_verbose();
801
case JMM_VERBOSE_CLASS:
802
return ClassLoadingService::get_verbose();
803
case JMM_THREAD_CONTENTION_MONITORING:
804
return ThreadService::is_thread_monitoring_contention();
805
case JMM_THREAD_CPU_TIME:
806
return ThreadService::is_thread_cpu_time_enabled();
807
case JMM_THREAD_ALLOCATED_MEMORY:
808
return ThreadService::is_thread_allocated_memory_enabled();
810
assert(0, "Unrecognized attribute");
815
// Sets the given boolean attribute and returns the previous value.
816
JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
819
return MemoryService::set_verbose(flag != 0);
820
case JMM_VERBOSE_CLASS:
821
return ClassLoadingService::set_verbose(flag != 0);
822
case JMM_THREAD_CONTENTION_MONITORING:
823
return ThreadService::set_thread_monitoring_contention(flag != 0);
824
case JMM_THREAD_CPU_TIME:
825
return ThreadService::set_thread_cpu_time_enabled(flag != 0);
826
case JMM_THREAD_ALLOCATED_MEMORY:
827
return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
829
assert(0, "Unrecognized attribute");
835
static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {838
return mgr->gc_time_ms();
841
return mgr->gc_count();
843
case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
844
// current implementation only has 1 ext attribute
848
assert(0, "Unrecognized GC attribute");
853
class VmThreadCountClosure: public ThreadClosure {857
VmThreadCountClosure() : _count(0) {};858
void do_thread(Thread* thread);
859
int count() { return _count; }862
void VmThreadCountClosure::do_thread(Thread* thread) {863
// exclude externally visible JavaThreads
864
if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {871
static jint get_vm_thread_count() {872
VmThreadCountClosure vmtcc;
874
MutexLocker ml(Threads_lock);
875
Threads::threads_do(&vmtcc);
878
return vmtcc.count();
881
static jint get_num_flags() {882
// last flag entry is always null, so subtract 1
883
int nFlags = (int) JVMFlag::numFlags - 1;
885
for (int i = 0; i < nFlags; i++) {886
JVMFlag* flag = &JVMFlag::flags[i];
887
// Exclude the locked (diagnostic, experimental) flags
888
if (flag->is_unlocked() || flag->is_unlocker()) {895
static jlong get_long_attribute(jmmLongAttribute att) {897
case JMM_CLASS_LOADED_COUNT:
898
return ClassLoadingService::loaded_class_count();
900
case JMM_CLASS_UNLOADED_COUNT:
901
return ClassLoadingService::unloaded_class_count();
903
case JMM_THREAD_TOTAL_COUNT:
904
return ThreadService::get_total_thread_count();
906
case JMM_THREAD_LIVE_COUNT:
907
return ThreadService::get_live_thread_count();
909
case JMM_THREAD_PEAK_COUNT:
910
return ThreadService::get_peak_thread_count();
912
case JMM_THREAD_DAEMON_COUNT:
913
return ThreadService::get_daemon_thread_count();
915
case JMM_JVM_INIT_DONE_TIME_MS:
916
return Management::vm_init_done_time();
918
case JMM_JVM_UPTIME_MS:
919
return Management::ticks_to_ms(os::elapsed_counter());
921
case JMM_COMPILE_TOTAL_TIME_MS:
922
return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
924
case JMM_OS_PROCESS_ID:
925
return os::current_process_id();
927
// Hotspot-specific counters
928
case JMM_CLASS_LOADED_BYTES:
929
return ClassLoadingService::loaded_class_bytes();
931
case JMM_CLASS_UNLOADED_BYTES:
932
return ClassLoadingService::unloaded_class_bytes();
934
case JMM_SHARED_CLASS_LOADED_COUNT:
935
return ClassLoadingService::loaded_shared_class_count();
937
case JMM_SHARED_CLASS_UNLOADED_COUNT:
938
return ClassLoadingService::unloaded_shared_class_count();
941
case JMM_SHARED_CLASS_LOADED_BYTES:
942
return ClassLoadingService::loaded_shared_class_bytes();
944
case JMM_SHARED_CLASS_UNLOADED_BYTES:
945
return ClassLoadingService::unloaded_shared_class_bytes();
947
case JMM_TOTAL_CLASSLOAD_TIME_MS:
948
return ClassLoader::classloader_time_ms();
950
case JMM_VM_GLOBAL_COUNT:
951
return get_num_flags();
953
case JMM_SAFEPOINT_COUNT:
954
return RuntimeService::safepoint_count();
956
case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
957
return RuntimeService::safepoint_sync_time_ms();
959
case JMM_TOTAL_STOPPED_TIME_MS:
960
return RuntimeService::safepoint_time_ms();
962
case JMM_TOTAL_APP_TIME_MS:
963
return RuntimeService::application_time_ms();
965
case JMM_VM_THREAD_COUNT:
966
return get_vm_thread_count();
968
case JMM_CLASS_INIT_TOTAL_COUNT:
969
return ClassLoader::class_init_count();
971
case JMM_CLASS_INIT_TOTAL_TIME_MS:
972
return ClassLoader::class_init_time_ms();
974
case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
975
return ClassLoader::class_verify_time_ms();
977
case JMM_METHOD_DATA_SIZE_BYTES:
978
return ClassLoadingService::class_method_data_size();
980
case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
981
return os::physical_memory();
989
// Returns the long value of a given attribute.
990
JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
991
if (obj == nullptr) {992
return get_long_attribute(att);
994
GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
995
if (mgr != nullptr) {996
return get_gc_attribute(mgr, att);
1002
// Gets the value of all attributes specified in the given array
1003
// and sets the value in the result array.
1004
// Returns the number of attributes found.
1005
JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
1007
jmmLongAttribute* atts,
1012
if (obj == nullptr) {1013
for (int i = 0; i < count; i++) {1014
result[i] = get_long_attribute(atts[i]);
1015
if (result[i] != -1) {1020
GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1021
for (int i = 0; i < count; i++) {1022
result[i] = get_gc_attribute(mgr, atts[i]);
1023
if (result[i] != -1) {1031
// Helper function to do thread dump for a specific list of threads
1032
static void do_thread_dump(ThreadDumpResult* dump_result,
1033
typeArrayHandle ids_ah, // array of thread ID (long[])
1036
bool with_locked_monitors,
1037
bool with_locked_synchronizers,
1039
// no need to actually perform thread dump if no TIDs are specified
1040
if (num_threads == 0) return;
1042
// First get an array of threadObj handles.
1043
// A JavaThread may terminate before we get the stack trace.
1044
GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1047
// Need this ThreadsListHandle for converting Java thread IDs into
1048
// threadObj handles; dump_result->set_t_list() is called in the
1049
// VM op below so we can't use it yet.
1050
ThreadsListHandle tlh;
1051
for (int i = 0; i < num_threads; i++) {1052
jlong tid = ids_ah->long_at(i);
1053
JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1054
oop thread_obj = is_platform_thread(jt) ? jt->threadObj() : (oop)nullptr;
1055
instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1056
thread_handle_array->append(threadObj_h);
1060
// Obtain thread dumps and thread snapshot information
1061
VM_ThreadDump op(dump_result,
1062
thread_handle_array,
1064
max_depth, /* stack depth */
1065
with_locked_monitors,
1066
with_locked_synchronizers);
1067
VMThread::execute(&op);
1070
// Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1071
// for the thread ID specified in the corresponding entry in
1072
// the given array of thread IDs; or null if the thread does not exist
1073
// or has terminated.
1076
// ids - array of thread IDs
1077
// maxDepth - the maximum depth of stack traces to be dumped:
1078
// maxDepth == -1 requests to dump entire stack trace.
1079
// maxDepth == 0 requests no stack trace.
1080
// infoArray - array of ThreadInfo objects
1082
// QQQ - Why does this method return a value instead of void?
1083
JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1084
// Check if threads is null
1085
if (ids == nullptr || infoArray == nullptr) {1086
THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1089
if (maxDepth < -1) {1090
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1091
"Invalid maxDepth", -1);
1094
ResourceMark rm(THREAD);
1095
typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1096
typeArrayHandle ids_ah(THREAD, ta);
1098
oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1099
objArrayOop oa = objArrayOop(infoArray_obj);
1100
objArrayHandle infoArray_h(THREAD, oa);
1102
// validate the thread id array
1103
validate_thread_id_array(ids_ah, CHECK_0);
1105
// validate the ThreadInfo[] parameters
1106
validate_thread_info_array(infoArray_h, CHECK_0);
1108
// infoArray must be of the same length as the given array of thread IDs
1109
int num_threads = ids_ah->length();
1110
if (num_threads != infoArray_h->length()) {1111
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1112
"The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1115
// Must use ThreadDumpResult to store the ThreadSnapshot.
1116
// GC may occur after the thread snapshots are taken but before
1117
// this function returns. The threadObj and other oops kept
1118
// in the ThreadSnapshot are marked and adjusted during GC.
1119
ThreadDumpResult dump_result(num_threads);
1121
if (maxDepth == 0) {1122
// No stack trace to dump so we do not need to stop the world.
1123
// Since we never do the VM op here we must set the threads list.
1124
dump_result.set_t_list();
1125
for (int i = 0; i < num_threads; i++) {1126
jlong tid = ids_ah->long_at(i);
1127
JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1128
if (jt == nullptr) {1129
// if the thread does not exist or now it is terminated,
1130
// create dummy snapshot
1131
dump_result.add_thread_snapshot();
1133
dump_result.add_thread_snapshot(jt);
1137
// obtain thread dump with the specific list of threads with stack trace
1138
do_thread_dump(&dump_result,
1142
false, /* no locked monitor */
1143
false, /* no locked synchronizers */
1147
int num_snapshots = dump_result.num_snapshots();
1148
assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1149
assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1151
for (ThreadSnapshot* ts = dump_result.snapshots(); ts != nullptr; index++, ts = ts->next()) {1152
// For each thread, create an java/lang/management/ThreadInfo object
1153
// and fill with the thread information
1155
if (!is_platform_thread(ts)) {1156
// if the thread does not exist, has terminated, or is a virtual thread, then set threadinfo to null
1157
infoArray_h->obj_at_put(index, nullptr);
1161
// Create java.lang.management.ThreadInfo object
1162
instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1163
infoArray_h->obj_at_put(index, info_obj);
1168
// Dump thread info for the specified threads.
1169
// It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1170
// for the thread ID specified in the corresponding entry in
1171
// the given array of thread IDs; or null if the thread does not exist
1172
// or has terminated.
1175
// ids - array of thread IDs; null indicates all live threads
1176
// locked_monitors - if true, dump locked object monitors
1177
// locked_synchronizers - if true, dump locked JSR-166 synchronizers
1179
JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1180
jboolean locked_synchronizers, jint maxDepth))
1181
ResourceMark rm(THREAD);
1183
typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1184
int num_threads = (ta != nullptr ? ta->length() : 0);
1185
typeArrayHandle ids_ah(THREAD, ta);
1187
ThreadDumpResult dump_result(num_threads); // can safepoint
1189
if (ids_ah() != nullptr) {1191
// validate the thread id array
1192
validate_thread_id_array(ids_ah, CHECK_NULL);
1194
// obtain thread dump of a specific list of threads
1195
do_thread_dump(&dump_result,
1198
maxDepth, /* stack depth */
1199
(locked_monitors ? true : false), /* with locked monitors */
1200
(locked_synchronizers ? true : false), /* with locked synchronizers */
1203
// obtain thread dump of all threads
1204
VM_ThreadDump op(&dump_result,
1205
maxDepth, /* stack depth */
1206
(locked_monitors ? true : false), /* with locked monitors */
1207
(locked_synchronizers ? true : false) /* with locked synchronizers */);
1208
VMThread::execute(&op);
1211
int num_snapshots = dump_result.num_snapshots();
1212
assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1214
// create the result ThreadInfo[] object
1215
InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1216
objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1217
objArrayHandle result_h(THREAD, r);
1220
for (ThreadSnapshot* ts = dump_result.snapshots(); ts != nullptr; ts = ts->next(), index++) {1221
if (!is_platform_thread(ts)) {1222
// if the thread does not exist, has terminated, or is a virtual thread, then set threadinfo to null
1223
result_h->obj_at_put(index, nullptr);
1227
ThreadStackTrace* stacktrace = ts->get_stack_trace();
1228
assert(stacktrace != nullptr, "Must have a stack trace dumped");
1230
// Create Object[] filled with locked monitors
1231
// Create int[] filled with the stack depth where a monitor was locked
1232
int num_frames = stacktrace->get_stack_depth();
1233
int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1235
// Count the total number of locked monitors
1236
for (int i = 0; i < num_frames; i++) {1237
StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1238
num_locked_monitors += frame->num_locked_monitors();
1241
objArrayHandle monitors_array;
1242
typeArrayHandle depths_array;
1243
objArrayHandle synchronizers_array;
1245
if (locked_monitors) {1246
// Constructs Object[] and int[] to contain the object monitor and the stack depth
1247
// where the thread locked it
1248
objArrayOop array = oopFactory::new_objArray(vmClasses::Object_klass(), num_locked_monitors, CHECK_NULL);
1249
objArrayHandle mh(THREAD, array);
1250
monitors_array = mh;
1252
typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1253
typeArrayHandle dh(THREAD, tarray);
1258
for (int depth = 0; depth < num_frames; depth++) {1259
StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1260
int len = frame->num_locked_monitors();
1261
GrowableArray<OopHandle>* locked_monitors = frame->locked_monitors();
1262
for (j = 0; j < len; j++) {1263
oop monitor = locked_monitors->at(j).resolve();
1264
assert(monitor != nullptr, "must be a Java object");
1265
monitors_array->obj_at_put(count, monitor);
1266
depths_array->int_at_put(count, depth);
1271
GrowableArray<OopHandle>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1272
for (j = 0; j < jni_locked_monitors->length(); j++) {1273
oop object = jni_locked_monitors->at(j).resolve();
1274
assert(object != nullptr, "must be a Java object");
1275
monitors_array->obj_at_put(count, object);
1276
// Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1277
depths_array->int_at_put(count, -1);
1280
assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1283
if (locked_synchronizers) {1284
// Create Object[] filled with locked JSR-166 synchronizers
1285
assert(ts->threadObj() != nullptr, "Must be a valid JavaThread");
1286
ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1287
GrowableArray<OopHandle>* locks = (tcl != nullptr ? tcl->owned_locks() : nullptr);
1288
int num_locked_synchronizers = (locks != nullptr ? locks->length() : 0);
1290
objArrayOop array = oopFactory::new_objArray(vmClasses::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1291
objArrayHandle sh(THREAD, array);
1292
synchronizers_array = sh;
1294
for (int k = 0; k < num_locked_synchronizers; k++) {1295
synchronizers_array->obj_at_put(k, locks->at(k).resolve());
1299
// Create java.lang.management.ThreadInfo object
1300
instanceOop info_obj = Management::create_thread_info_instance(ts,
1303
synchronizers_array,
1305
result_h->obj_at_put(index, info_obj);
1308
return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
1311
// Reset statistic. Return true if the requested statistic is reset.
1312
// Otherwise, return false.
1315
// obj - specify which instance the statistic associated with to be reset
1316
// For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1317
// For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1318
// type - the type of statistic to be reset
1320
JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1321
ResourceMark rm(THREAD);
1324
case JMM_STAT_PEAK_THREAD_COUNT:
1325
ThreadService::reset_peak_thread_count();
1328
case JMM_STAT_THREAD_CONTENTION_COUNT:
1329
case JMM_STAT_THREAD_CONTENTION_TIME: {1332
THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1335
// Look for the JavaThread of this given tid
1336
JavaThreadIteratorWithHandle jtiwh;
1338
// reset contention statistics for all threads if tid == 0
1339
for (; JavaThread *java_thread = jtiwh.next(); ) {1340
if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {1341
ThreadService::reset_contention_count_stat(java_thread);
1343
ThreadService::reset_contention_time_stat(java_thread);
1347
// reset contention statistics for a given thread
1348
JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1349
if (java_thread == nullptr) {1353
if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {1354
ThreadService::reset_contention_count_stat(java_thread);
1356
ThreadService::reset_contention_time_stat(java_thread);
1362
case JMM_STAT_PEAK_POOL_USAGE: {1365
THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1368
oop pool_obj = JNIHandles::resolve(o);
1369
assert(pool_obj->is_instance(), "Should be an instanceOop");
1370
instanceHandle ph(THREAD, (instanceOop) pool_obj);
1372
MemoryPool* pool = MemoryService::get_memory_pool(ph);
1373
if (pool != nullptr) {1374
pool->reset_peak_memory_usage();
1379
case JMM_STAT_GC_STAT: {1382
THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1385
GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_false);
1386
if (mgr != nullptr) {1387
mgr->reset_gc_stat();
1393
assert(0, "Unknown Statistic Type");
1398
// Returns the fast estimate of CPU time consumed by
1399
// a given thread (in nanoseconds).
1400
// If thread_id == 0, return CPU time for the current thread.
1401
JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1402
if (!os::is_thread_cpu_time_supported()) {1406
if (thread_id < 0) {1407
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1408
"Invalid thread ID", -1);
1411
JavaThread* java_thread = nullptr;
1412
if (thread_id == 0) {1414
return os::current_thread_cpu_time();
1416
ThreadsListHandle tlh;
1417
java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1418
if (is_platform_thread(java_thread)) {1419
return os::thread_cpu_time((Thread*) java_thread);
1425
// Returns a String array of all VM global flag names
1426
JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1427
// last flag entry is always null, so subtract 1
1428
int nFlags = (int) JVMFlag::numFlags - 1;
1429
// allocate a temp array
1430
objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(),
1431
nFlags, CHECK_NULL);
1432
objArrayHandle flags_ah(THREAD, r);
1433
int num_entries = 0;
1434
for (int i = 0; i < nFlags; i++) {1435
JVMFlag* flag = &JVMFlag::flags[i];
1436
// Exclude develop flags in product builds.
1437
if (flag->is_constant_in_binary()) {1440
// Exclude the locked (experimental, diagnostic) flags
1441
if (flag->is_unlocked() || flag->is_unlocker()) {1442
Handle s = java_lang_String::create_from_str(flag->name(), CHECK_NULL);
1443
flags_ah->obj_at_put(num_entries, s());
1448
if (num_entries < nFlags) {1449
// Return array of right length
1450
objArrayOop res = oopFactory::new_objArray(vmClasses::String_klass(), num_entries, CHECK_NULL);
1451
for(int i = 0; i < num_entries; i++) {1452
res->obj_at_put(i, flags_ah->obj_at(i));
1454
return (jobjectArray)JNIHandles::make_local(THREAD, res);
1457
return (jobjectArray)JNIHandles::make_local(THREAD, flags_ah());
1460
// Utility function used by jmm_GetVMGlobals. Returns false if flag type
1461
// can't be determined, true otherwise. If false is returned, then *global
1462
// will be incomplete and invalid.
1463
static bool add_global_entry(Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {1465
if (name() == nullptr) {1466
flag_name = java_lang_String::create_from_str(flag->name(), CHECK_false);
1470
global->name = (jstring)JNIHandles::make_local(THREAD, flag_name());
1472
if (flag->is_bool()) {1473
global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1474
global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1475
} else if (flag->is_int()) {1476
global->value.j = (jlong)flag->get_int();
1477
global->type = JMM_VMGLOBAL_TYPE_JLONG;
1478
} else if (flag->is_uint()) {1479
global->value.j = (jlong)flag->get_uint();
1480
global->type = JMM_VMGLOBAL_TYPE_JLONG;
1481
} else if (flag->is_intx()) {1482
global->value.j = (jlong)flag->get_intx();
1483
global->type = JMM_VMGLOBAL_TYPE_JLONG;
1484
} else if (flag->is_uintx()) {1485
global->value.j = (jlong)flag->get_uintx();
1486
global->type = JMM_VMGLOBAL_TYPE_JLONG;
1487
} else if (flag->is_uint64_t()) {1488
global->value.j = (jlong)flag->get_uint64_t();
1489
global->type = JMM_VMGLOBAL_TYPE_JLONG;
1490
} else if (flag->is_double()) {1491
global->value.d = (jdouble)flag->get_double();
1492
global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1493
} else if (flag->is_size_t()) {1494
global->value.j = (jlong)flag->get_size_t();
1495
global->type = JMM_VMGLOBAL_TYPE_JLONG;
1496
} else if (flag->is_ccstr()) {1497
Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1498
global->value.l = (jobject)JNIHandles::make_local(THREAD, str());
1499
global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1501
global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1505
global->writeable = flag->is_writeable();
1506
global->external = flag->is_external();
1507
switch (flag->get_origin()) {1508
case JVMFlagOrigin::DEFAULT:
1509
global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1511
case JVMFlagOrigin::COMMAND_LINE:
1512
global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1514
case JVMFlagOrigin::ENVIRON_VAR:
1515
global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1517
case JVMFlagOrigin::CONFIG_FILE:
1518
global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1520
case JVMFlagOrigin::MANAGEMENT:
1521
global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1523
case JVMFlagOrigin::ERGONOMIC:
1524
global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1526
case JVMFlagOrigin::ATTACH_ON_DEMAND:
1527
global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1530
global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1536
// Fill globals array of count length with jmmVMGlobal entries
1537
// specified by names. If names == null, fill globals array
1538
// with all Flags. Return value is number of entries
1539
// created in globals.
1540
// If a JVMFlag with a given name in an array element does not
1541
// exist, globals[i].name will be set to null.
1542
JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1544
jmmVMGlobal *globals,
1548
if (globals == nullptr) {1549
THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1552
ResourceMark rm(THREAD);
1554
if (names != nullptr) {1555
// return the requested globals
1556
objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1557
objArrayHandle names_ah(THREAD, ta);
1558
// Make sure we have a String array
1559
Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1560
if (element_klass != vmClasses::String_klass()) {1561
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1562
"Array element type is not String class", 0);
1565
int names_length = names_ah->length();
1566
int num_entries = 0;
1567
for (int i = 0; i < names_length && i < count; i++) {1568
oop s = names_ah->obj_at(i);
1570
THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1573
Handle sh(THREAD, s);
1574
char* str = java_lang_String::as_utf8_string(s);
1575
JVMFlag* flag = JVMFlag::find_flag(str);
1576
if (flag != nullptr &&
1577
add_global_entry(sh, &globals[i], flag, THREAD)) {1580
globals[i].name = nullptr;
1585
// return all globals if names == null
1587
// last flag entry is always null, so subtract 1
1588
int nFlags = (int) JVMFlag::numFlags - 1;
1590
int num_entries = 0;
1591
for (int i = 0; i < nFlags && num_entries < count; i++) {1592
JVMFlag* flag = &JVMFlag::flags[i];
1593
// Exclude develop flags in product builds.
1594
if (flag->is_constant_in_binary()) {1597
// Exclude the locked (diagnostic, experimental) flags
1598
if ((flag->is_unlocked() || flag->is_unlocker()) &&
1599
add_global_entry(null_h, &globals[num_entries], flag, THREAD)) {1607
JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1608
ResourceMark rm(THREAD);
1610
oop fn = JNIHandles::resolve_external_guard(flag_name);
1611
if (fn == nullptr) {1612
THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1613
"The flag name cannot be null.");
1615
char* name = java_lang_String::as_utf8_string(fn);
1617
FormatBuffer<80> error_msg("%s", "");1618
int succeed = WriteableFlags::set_flag(name, new_value, JVMFlagOrigin::MANAGEMENT, error_msg);
1620
if (succeed != JVMFlag::SUCCESS) {1621
if (succeed == JVMFlag::MISSING_VALUE) {1622
// missing value causes NPE to be thrown
1623
THROW(vmSymbols::java_lang_NullPointerException());
1625
// all the other errors are reported as IAE with the appropriate error message
1626
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1627
error_msg.buffer());
1630
assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1633
class ThreadTimesClosure: public ThreadClosure {1635
objArrayHandle _names_strings;
1636
char **_names_chars;
1637
typeArrayHandle _times;
1643
ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1644
~ThreadTimesClosure();
1645
virtual void do_thread(Thread* thread);
1646
void do_unlocked(TRAPS);
1647
int count() { return _count; }1650
ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1651
typeArrayHandle times) {1652
assert(names() != nullptr, "names was null");
1653
assert(times() != nullptr, "times was null");
1654
_names_strings = names;
1655
_names_len = names->length();
1656
_names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1658
_times_len = times->length();
1663
// Called with Threads_lock held
1665
void ThreadTimesClosure::do_thread(Thread* thread) {1666
assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
1667
assert(thread != nullptr, "thread was null");
1669
// exclude externally visible JavaThreads
1670
if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {1674
if (_count >= _names_len || _count >= _times_len) {1675
// skip if the result array is not big enough
1679
ResourceMark rm; // thread->name() uses ResourceArea
1681
assert(thread->name() != nullptr, "All threads should have a name");
1682
_names_chars[_count] = os::strdup_check_oom(thread->name());
1683
_times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1684
os::thread_cpu_time(thread) : -1);
1688
// Called without Threads_lock, we can allocate String objects.
1689
void ThreadTimesClosure::do_unlocked(TRAPS) {1691
for (int i = 0; i < _count; i++) {1692
Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1693
_names_strings->obj_at_put(i, s());
1697
ThreadTimesClosure::~ThreadTimesClosure() {1698
for (int i = 0; i < _count; i++) {1699
os::free(_names_chars[i]);
1701
FREE_C_HEAP_ARRAY(char *, _names_chars);
1704
// Fills names with VM internal thread names and times with the corresponding
1705
// CPU times. If names or times is null, a NullPointerException is thrown.
1706
// If the element type of names is not String, an IllegalArgumentException is
1708
// If an array is not large enough to hold all the entries, only the entries
1709
// that fit will be returned. Return value is the number of VM internal
1711
JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1714
if (names == nullptr || times == nullptr) {1715
THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1717
objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1718
objArrayHandle names_ah(THREAD, na);
1720
// Make sure we have a String array
1721
Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1722
if (element_klass != vmClasses::String_klass()) {1723
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1724
"Array element type is not String class", 0);
1727
typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1728
typeArrayHandle times_ah(THREAD, ta);
1730
ThreadTimesClosure ttc(names_ah, times_ah);
1732
MutexLocker ml(THREAD, Threads_lock);
1733
Threads::threads_do(&ttc);
1735
ttc.do_unlocked(THREAD);
1739
static Handle find_deadlocks(bool object_monitors_only, TRAPS) {1740
ResourceMark rm(THREAD);
1742
VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1743
VMThread::execute(&op);
1745
DeadlockCycle* deadlocks = op.result();
1746
if (deadlocks == nullptr) {1747
// no deadlock found and return
1751
int num_threads = 0;
1752
DeadlockCycle* cycle;
1753
for (cycle = deadlocks; cycle != nullptr; cycle = cycle->next()) {1754
num_threads += cycle->num_threads();
1757
objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NH);
1758
objArrayHandle threads_ah(THREAD, r);
1761
for (cycle = deadlocks; cycle != nullptr; cycle = cycle->next()) {1762
GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1763
int len = deadlock_threads->length();
1764
for (int i = 0; i < len; i++) {1765
threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1772
// Finds cycles of threads that are deadlocked involved in object monitors
1773
// and JSR-166 synchronizers.
1774
// Returns an array of Thread objects which are in deadlock, if any.
1775
// Otherwise, returns null.
1778
// object_monitors_only - if true, only check object monitors
1780
JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1781
Handle result = find_deadlocks(object_monitors_only != 0, CHECK_NULL);
1782
return (jobjectArray) JNIHandles::make_local(THREAD, result());
1785
// Finds cycles of threads that are deadlocked on monitor locks
1786
// Returns an array of Thread objects which are in deadlock, if any.
1787
// Otherwise, returns null.
1788
JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1789
Handle result = find_deadlocks(true, CHECK_NULL);
1790
return (jobjectArray) JNIHandles::make_local(THREAD, result());
1793
// Gets the information about GC extension attributes including
1794
// the name of the attribute, its type, and a short description.
1797
// mgr - GC memory manager
1798
// info - caller allocated array of jmmExtAttributeInfo
1799
// count - number of elements of the info array
1801
// Returns the number of GC extension attributes filled in the info array; or
1802
// -1 if info is not big enough
1804
JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1805
// All GC memory managers have 1 attribute (number of GC threads)
1810
if (info == nullptr) {1811
THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1814
info[0].name = "GcThreadCount";
1816
info[0].description = "Number of GC threads";
1820
// verify the given array is an array of java/lang/management/MemoryUsage objects
1821
// of a given length and return the objArrayOop
1822
static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {1823
if (array == nullptr) {1824
THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1827
objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1828
objArrayHandle array_h(THREAD, oa);
1830
// array must be of the given length
1831
if (length != array_h->length()) {1832
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1833
"The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1836
// check if the element of array is of type MemoryUsage class
1837
Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_NULL);
1838
Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1839
if (element_klass != usage_klass) {1840
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1841
"The element type is not MemoryUsage class", 0);
1847
// Gets the statistics of the last GC of a given GC memory manager.
1849
// obj - GarbageCollectorMXBean object
1850
// gc_stat - caller allocated jmmGCStat where:
1851
// a. before_gc_usage - array of MemoryUsage objects
1852
// b. after_gc_usage - array of MemoryUsage objects
1853
// c. gc_ext_attributes_values_size is set to the
1854
// gc_ext_attribute_values array allocated
1855
// d. gc_ext_attribute_values is a caller allocated array of jvalue.
1858
// gc_index == 0 indicates no GC statistics available
1860
// before_gc_usage and after_gc_usage - filled with per memory pool
1861
// before and after GC usage in the same order as the memory pools
1862
// returned by GetMemoryPools for a given GC memory manager.
1863
// num_gc_ext_attributes indicates the number of elements in
1864
// the gc_ext_attribute_values array is filled; or
1865
// -1 if the gc_ext_attributes_values array is not big enough
1867
JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1868
ResourceMark rm(THREAD);
1870
if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == nullptr) {1871
THROW(vmSymbols::java_lang_NullPointerException());
1874
// Get the GCMemoryManager
1875
GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1877
// Make a copy of the last GC statistics
1878
// GC may occur while constructing the last GC information
1879
int num_pools = MemoryService::num_memory_pools();
1880
GCStatInfo stat(num_pools);
1881
if (mgr->get_last_gc_stat(&stat) == 0) {1882
gc_stat->gc_index = 0;
1886
gc_stat->gc_index = stat.gc_index();
1887
gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1888
gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1890
// Current implementation does not have GC extension attributes
1891
gc_stat->num_gc_ext_attributes = 0;
1893
// Fill the arrays of MemoryUsage objects with before and after GC
1894
// per pool memory usage
1895
objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1898
objArrayHandle usage_before_gc_ah(THREAD, bu);
1900
objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1903
objArrayHandle usage_after_gc_ah(THREAD, au);
1905
for (int i = 0; i < num_pools; i++) {1906
Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1909
MemoryUsage u = stat.after_gc_usage_for_pool(i);
1910
if (u.max_size() == 0 && u.used() > 0) {1911
// If max size == 0, this pool is a survivor space.
1912
// Set max size = -1 since the pools will be swapped after GC.
1913
MemoryUsage usage(u.init_size(), u.used(), u.committed(), MemoryUsage::undefined_size());
1914
after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1916
after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1918
usage_before_gc_ah->obj_at_put(i, before_usage());
1919
usage_after_gc_ah->obj_at_put(i, after_usage());
1922
if (gc_stat->gc_ext_attribute_values_size > 0) {1923
// Current implementation only has 1 attribute (number of GC threads)
1925
gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1929
JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1930
ResourceMark rm(THREAD);
1931
// Get the GCMemoryManager
1932
GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1933
mgr->set_notification_enabled(enabled?true:false);
1936
// Dump heap - Returns 0 if succeeds.
1937
JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1939
ResourceMark rm(THREAD);
1940
oop on = JNIHandles::resolve_external_guard(outputfile);
1941
if (on == nullptr) {1942
THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1943
"Output file name cannot be null.", -1);
1945
Handle onhandle(THREAD, on);
1946
char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1947
if (name == nullptr) {1948
THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1949
"Output file name cannot be null.", -1);
1951
HeapDumper dumper(live ? true : false);
1952
if (dumper.dump(name) != 0) {1953
const char* errmsg = dumper.error_as_C_string();
1954
THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1957
#else // INCLUDE_SERVICES
1959
#endif // INCLUDE_SERVICES
1962
JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1963
ResourceMark rm(THREAD);
1964
GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1965
objArrayOop cmd_array_oop = oopFactory::new_objArray(vmClasses::String_klass(),
1966
dcmd_list->length(), CHECK_NULL);
1967
objArrayHandle cmd_array(THREAD, cmd_array_oop);
1968
for (int i = 0; i < dcmd_list->length(); i++) {1969
oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1970
cmd_array->obj_at_put(i, cmd_name);
1972
return (jobjectArray) JNIHandles::make_local(THREAD, cmd_array());
1975
JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1976
dcmdInfo* infoArray))
1977
if (cmds == nullptr || infoArray == nullptr) {1978
THROW(vmSymbols::java_lang_NullPointerException());
1981
ResourceMark rm(THREAD);
1983
objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1984
objArrayHandle cmds_ah(THREAD, ca);
1986
// Make sure we have a String array
1987
Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1988
if (element_klass != vmClasses::String_klass()) {1989
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1990
"Array element type is not String class");
1993
GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1995
int num_cmds = cmds_ah->length();
1996
for (int i = 0; i < num_cmds; i++) {1997
oop cmd = cmds_ah->obj_at(i);
1998
if (cmd == nullptr) {1999
THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2000
"Command name cannot be null.");
2002
char* cmd_name = java_lang_String::as_utf8_string(cmd);
2003
if (cmd_name == nullptr) {2004
THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2005
"Command name cannot be null.");
2007
int pos = info_list->find_if([&](DCmdInfo* info) {2008
return info->name_equals(cmd_name);
2011
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2012
"Unknown diagnostic command");
2014
DCmdInfo* info = info_list->at(pos);
2015
infoArray[i].name = info->name();
2016
infoArray[i].description = info->description();
2017
infoArray[i].impact = info->impact();
2018
JavaPermission p = info->permission();
2019
infoArray[i].permission_class = p._class;
2020
infoArray[i].permission_name = p._name;
2021
infoArray[i].permission_action = p._action;
2022
infoArray[i].num_arguments = info->num_arguments();
2023
infoArray[i].enabled = info->is_enabled();
2027
JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2028
jstring command, dcmdArgInfo* infoArray, jint count))
2029
ResourceMark rm(THREAD);
2030
oop cmd = JNIHandles::resolve_external_guard(command);
2031
if (cmd == nullptr) {2032
THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2033
"Command line cannot be null.");
2035
char* cmd_name = java_lang_String::as_utf8_string(cmd);
2036
if (cmd_name == nullptr) {2037
THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2038
"Command line content cannot be null.");
2040
DCmd* dcmd = nullptr;
2041
DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2043
if (factory != nullptr) {2044
dcmd = factory->create_resource_instance(nullptr);
2046
if (dcmd == nullptr) {2047
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2048
"Unknown diagnostic command");
2050
DCmdMark mark(dcmd);
2051
GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2052
const int num_args = array->length();
2053
if (num_args != count) {2054
assert(false, "jmm_GetDiagnosticCommandArgumentsInfo count mismatch (%d vs %d)", count, num_args);
2055
THROW_MSG(vmSymbols::java_lang_InternalError(), "jmm_GetDiagnosticCommandArgumentsInfo count mismatch");
2057
for (int i = 0; i < num_args; i++) {2058
infoArray[i].name = array->at(i)->name();
2059
infoArray[i].description = array->at(i)->description();
2060
infoArray[i].type = array->at(i)->type();
2061
infoArray[i].default_string = array->at(i)->default_string();
2062
infoArray[i].mandatory = array->at(i)->is_mandatory();
2063
infoArray[i].option = array->at(i)->is_option();
2064
infoArray[i].multiple = array->at(i)->is_multiple();
2065
infoArray[i].position = array->at(i)->position();
2070
JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2071
ResourceMark rm(THREAD);
2072
oop cmd = JNIHandles::resolve_external_guard(commandline);
2073
if (cmd == nullptr) {2074
THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2075
"Command line cannot be null.");
2077
char* cmdline = java_lang_String::as_utf8_string(cmd);
2078
if (cmdline == nullptr) {2079
THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2080
"Command line content cannot be null.");
2082
bufferedStream output;
2083
DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2084
oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2085
return (jstring) JNIHandles::make_local(THREAD, result);
2088
JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2089
DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2092
jlong Management::ticks_to_ms(jlong ticks) {2093
assert(os::elapsed_frequency() > 0, "Must be non-zero");
2094
return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2098
// Gets the amount of memory allocated on the Java heap since JVM launch.
2099
JVM_ENTRY(jlong, jmm_GetTotalThreadAllocatedMemory(JNIEnv *env))
2100
// A thread increments exited_allocated_bytes in ThreadService::remove_thread
2101
// only after it removes itself from the threads list, and once a TLH is
2102
// created, no thread it references can remove itself from the threads
2103
// list, so none can update exited_allocated_bytes. We therefore initialize
2104
// result with exited_allocated_bytes after after we create the TLH so that
2105
// the final result can only be short due to (1) threads that start after
2106
// the TLH is created, or (2) terminating threads that escape TLH creation
2107
// and don't update exited_allocated_bytes before we initialize result.
2109
// We keep a high water mark to ensure monotonicity in case threads counted
2110
// on a previous call end up in state (2).
2111
static jlong high_water_result = 0;
2113
JavaThreadIteratorWithHandle jtiwh;
2114
jlong result = ThreadService::exited_allocated_bytes();
2115
for (; JavaThread* thread = jtiwh.next();) {2116
jlong size = thread->cooked_allocated_bytes();
2121
assert(MonitoringSupport_lock != nullptr, "Must be");
2122
MutexLocker ml(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
2123
if (result < high_water_result) {2124
// Encountered (2) above, or result wrapped to a negative value. In
2125
// the latter case, it's pegged at the last positive value.
2126
result = high_water_result;
2128
high_water_result = result;
2134
// Gets the amount of memory allocated on the Java heap for a single thread.
2135
// Returns -1 if the thread does not exist or has terminated.
2136
JVM_ENTRY(jlong, jmm_GetOneThreadAllocatedMemory(JNIEnv *env, jlong thread_id))
2137
if (thread_id < 0) {2138
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2139
"Invalid thread ID", -1);
2142
if (thread_id == 0) { // current thread2143
return thread->cooked_allocated_bytes();
2146
ThreadsListHandle tlh;
2147
JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2148
if (is_platform_thread(java_thread)) {2149
return java_thread->cooked_allocated_bytes();
2154
// Gets an array containing the amount of memory allocated on the Java
2155
// heap for a set of threads (in bytes). Each element of the array is
2156
// the amount of memory allocated for the thread ID specified in the
2157
// corresponding entry in the given array of thread IDs; or -1 if the
2158
// thread does not exist or has terminated.
2159
JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2160
jlongArray sizeArray))
2161
// Check if threads is null
2162
if (ids == nullptr || sizeArray == nullptr) {2163
THROW(vmSymbols::java_lang_NullPointerException());
2166
ResourceMark rm(THREAD);
2167
typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2168
typeArrayHandle ids_ah(THREAD, ta);
2170
typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2171
typeArrayHandle sizeArray_h(THREAD, sa);
2173
// validate the thread id array
2174
validate_thread_id_array(ids_ah, CHECK);
2176
// sizeArray must be of the same length as the given array of thread IDs
2177
int num_threads = ids_ah->length();
2178
if (num_threads != sizeArray_h->length()) {2179
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2180
"The length of the given long array does not match the length of "
2181
"the given array of thread IDs");
2184
ThreadsListHandle tlh;
2185
for (int i = 0; i < num_threads; i++) {2186
JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2187
if (is_platform_thread(java_thread)) {2188
sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2193
// Returns the CPU time consumed by a given thread (in nanoseconds).
2194
// If thread_id == 0, CPU time for the current thread is returned.
2195
// If user_sys_cpu_time = true, user level and system CPU time of
2196
// a given thread is returned; otherwise, only user level CPU time
2198
JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2199
if (!os::is_thread_cpu_time_supported()) {2203
if (thread_id < 0) {2204
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2205
"Invalid thread ID", -1);
2208
JavaThread* java_thread = nullptr;
2209
if (thread_id == 0) {2211
return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2213
ThreadsListHandle tlh;
2214
java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2215
if (is_platform_thread(java_thread)) {2216
return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2222
// Gets an array containing the CPU times consumed by a set of threads
2223
// (in nanoseconds). Each element of the array is the CPU time for the
2224
// thread ID specified in the corresponding entry in the given array
2225
// of thread IDs; or -1 if the thread does not exist or has terminated.
2226
// If user_sys_cpu_time = true, the sum of user level and system CPU time
2227
// for the given thread is returned; otherwise, only user level CPU time
2229
JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2230
jlongArray timeArray,
2231
jboolean user_sys_cpu_time))
2232
// Check if threads is null
2233
if (ids == nullptr || timeArray == nullptr) {2234
THROW(vmSymbols::java_lang_NullPointerException());
2237
ResourceMark rm(THREAD);
2238
typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2239
typeArrayHandle ids_ah(THREAD, ta);
2241
typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2242
typeArrayHandle timeArray_h(THREAD, tia);
2244
// validate the thread id array
2245
validate_thread_id_array(ids_ah, CHECK);
2247
// timeArray must be of the same length as the given array of thread IDs
2248
int num_threads = ids_ah->length();
2249
if (num_threads != timeArray_h->length()) {2250
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2251
"The length of the given long array does not match the length of "
2252
"the given array of thread IDs");
2255
ThreadsListHandle tlh;
2256
for (int i = 0; i < num_threads; i++) {2257
JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2258
if (is_platform_thread(java_thread)) {2259
timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2260
user_sys_cpu_time != 0));
2265
const struct jmmInterface_1_ jmm_interface = {2269
jmm_GetOptionalSupport,
2272
jmm_GetMemoryManagers,
2273
jmm_GetMemoryPoolUsage,
2274
jmm_GetPeakMemoryPoolUsage,
2275
jmm_GetTotalThreadAllocatedMemory,
2276
jmm_GetOneThreadAllocatedMemory,
2277
jmm_GetThreadAllocatedMemory,
2279
jmm_GetLongAttribute,
2280
jmm_GetBoolAttribute,
2281
jmm_SetBoolAttribute,
2282
jmm_GetLongAttributes,
2283
jmm_FindMonitorDeadlockedThreads,
2284
jmm_GetThreadCpuTime,
2285
jmm_GetVMGlobalNames,
2287
jmm_GetInternalThreadTimes,
2290
jmm_SetPoolThreshold,
2291
jmm_GetPoolCollectionUsage,
2292
jmm_GetGCExtAttributeInfo,
2294
jmm_GetThreadCpuTimeWithKind,
2295
jmm_GetThreadCpuTimesWithKind,
2297
jmm_FindDeadlockedThreads,
2301
jmm_SetGCNotificationEnabled,
2302
jmm_GetDiagnosticCommands,
2303
jmm_GetDiagnosticCommandInfo,
2304
jmm_GetDiagnosticCommandArgumentsInfo,
2305
jmm_ExecuteDiagnosticCommand,
2306
jmm_SetDiagnosticFrameworkNotificationEnabled
2308
#endif // INCLUDE_MANAGEMENT
2310
void* Management::get_jmm_interface(int version) {2311
#if INCLUDE_MANAGEMENT
2312
if (version == JMM_VERSION) {2313
return (void*) &jmm_interface;
2315
#endif // INCLUDE_MANAGEMENT