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