management.cpp revision 0:a61af66fc99e
1/* 2 * Copyright 2003-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25# include "incls/_precompiled.incl" 26# include "incls/_management.cpp.incl" 27 28PerfVariable* Management::_begin_vm_creation_time = NULL; 29PerfVariable* Management::_end_vm_creation_time = NULL; 30PerfVariable* Management::_vm_init_done_time = NULL; 31 32klassOop Management::_sensor_klass = NULL; 33klassOop Management::_threadInfo_klass = NULL; 34klassOop Management::_memoryUsage_klass = NULL; 35klassOop Management::_memoryPoolMXBean_klass = NULL; 36klassOop Management::_memoryManagerMXBean_klass = NULL; 37klassOop Management::_garbageCollectorMXBean_klass = NULL; 38klassOop Management::_managementFactory_klass = NULL; 39 40jmmOptionalSupport Management::_optional_support = {0}; 41TimeStamp Management::_stamp; 42 43void management_init() { 44 Management::init(); 45 ThreadService::init(); 46 RuntimeService::init(); 47 ClassLoadingService::init(); 48} 49 50void Management::init() { 51 EXCEPTION_MARK; 52 53 // These counters are for java.lang.management API support. 54 // They are created even if -XX:-UsePerfData is set and in 55 // that case, they will be allocated on C heap. 56 57 _begin_vm_creation_time = 58 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime", 59 PerfData::U_None, CHECK); 60 61 _end_vm_creation_time = 62 PerfDataManager::create_variable(SUN_RT, "createVmEndTime", 63 PerfData::U_None, CHECK); 64 65 _vm_init_done_time = 66 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime", 67 PerfData::U_None, CHECK); 68 69 // Initialize optional support 70 _optional_support.isLowMemoryDetectionSupported = 1; 71 _optional_support.isCompilationTimeMonitoringSupported = 1; 72 _optional_support.isThreadContentionMonitoringSupported = 1; 73 74 if (os::is_thread_cpu_time_supported()) { 75 _optional_support.isCurrentThreadCpuTimeSupported = 1; 76 _optional_support.isOtherThreadCpuTimeSupported = 1; 77 } else { 78 _optional_support.isCurrentThreadCpuTimeSupported = 0; 79 _optional_support.isOtherThreadCpuTimeSupported = 0; 80 } 81 _optional_support.isBootClassPathSupported = 1; 82 _optional_support.isObjectMonitorUsageSupported = 1; 83#ifndef SERVICES_KERNEL 84 // This depends on the heap inspector 85 _optional_support.isSynchronizerUsageSupported = 1; 86#endif // SERVICES_KERNEL 87} 88 89void Management::initialize(TRAPS) { 90 // Start the low memory detector thread 91 LowMemoryDetector::initialize(); 92 93 if (ManagementServer) { 94 ResourceMark rm(THREAD); 95 HandleMark hm(THREAD); 96 97 // Load and initialize the sun.management.Agent class 98 // invoke startAgent method to start the management server 99 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader()); 100 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::sun_management_Agent(), 101 loader, 102 Handle(), 103 true, 104 CHECK); 105 instanceKlassHandle ik (THREAD, k); 106 107 JavaValue result(T_VOID); 108 JavaCalls::call_static(&result, 109 ik, 110 vmSymbolHandles::startAgent_name(), 111 vmSymbolHandles::void_method_signature(), 112 CHECK); 113 } 114} 115 116void Management::get_optional_support(jmmOptionalSupport* support) { 117 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport)); 118} 119 120klassOop Management::load_and_initialize_klass(symbolHandle sh, TRAPS) { 121 klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL); 122 instanceKlassHandle ik (THREAD, k); 123 if (ik->should_be_initialized()) { 124 ik->initialize(CHECK_NULL); 125 } 126 return ik(); 127} 128 129void Management::record_vm_startup_time(jlong begin, jlong duration) { 130 // if the performance counter is not initialized, 131 // then vm initialization failed; simply return. 132 if (_begin_vm_creation_time == NULL) return; 133 134 _begin_vm_creation_time->set_value(begin); 135 _end_vm_creation_time->set_value(begin + duration); 136 PerfMemory::set_accessible(true); 137} 138 139jlong Management::timestamp() { 140 TimeStamp t; 141 t.update(); 142 return t.ticks() - _stamp.ticks(); 143} 144 145void Management::oops_do(OopClosure* f) { 146 MemoryService::oops_do(f); 147 ThreadService::oops_do(f); 148 149 f->do_oop((oop*) &_sensor_klass); 150 f->do_oop((oop*) &_threadInfo_klass); 151 f->do_oop((oop*) &_memoryUsage_klass); 152 f->do_oop((oop*) &_memoryPoolMXBean_klass); 153 f->do_oop((oop*) &_memoryManagerMXBean_klass); 154 f->do_oop((oop*) &_garbageCollectorMXBean_klass); 155 f->do_oop((oop*) &_managementFactory_klass); 156} 157 158klassOop Management::java_lang_management_ThreadInfo_klass(TRAPS) { 159 if (_threadInfo_klass == NULL) { 160 _threadInfo_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_ThreadInfo(), CHECK_NULL); 161 } 162 return _threadInfo_klass; 163} 164 165klassOop Management::java_lang_management_MemoryUsage_klass(TRAPS) { 166 if (_memoryUsage_klass == NULL) { 167 _memoryUsage_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryUsage(), CHECK_NULL); 168 } 169 return _memoryUsage_klass; 170} 171 172klassOop Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) { 173 if (_memoryPoolMXBean_klass == NULL) { 174 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryPoolMXBean(), CHECK_NULL); 175 } 176 return _memoryPoolMXBean_klass; 177} 178 179klassOop Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) { 180 if (_memoryManagerMXBean_klass == NULL) { 181 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryManagerMXBean(), CHECK_NULL); 182 } 183 return _memoryManagerMXBean_klass; 184} 185 186klassOop Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) { 187 if (_garbageCollectorMXBean_klass == NULL) { 188 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL); 189 } 190 return _garbageCollectorMXBean_klass; 191} 192 193klassOop Management::sun_management_Sensor_klass(TRAPS) { 194 if (_sensor_klass == NULL) { 195 _sensor_klass = load_and_initialize_klass(vmSymbolHandles::sun_management_Sensor(), CHECK_NULL); 196 } 197 return _sensor_klass; 198} 199 200klassOop Management::sun_management_ManagementFactory_klass(TRAPS) { 201 if (_managementFactory_klass == NULL) { 202 _managementFactory_klass = load_and_initialize_klass(vmSymbolHandles::sun_management_ManagementFactory(), CHECK_NULL); 203 } 204 return _managementFactory_klass; 205} 206 207static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) { 208 Handle snapshot_thread(THREAD, snapshot->threadObj()); 209 210 jlong contended_time; 211 jlong waited_time; 212 if (ThreadService::is_thread_monitoring_contention()) { 213 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks()); 214 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks()); 215 } else { 216 // set them to -1 if thread contention monitoring is disabled. 217 contended_time = max_julong; 218 waited_time = max_julong; 219 } 220 221 int thread_status = snapshot->thread_status(); 222 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object"); 223 if (snapshot->is_ext_suspended()) { 224 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED; 225 } 226 if (snapshot->is_in_native()) { 227 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE; 228 } 229 230 ThreadStackTrace* st = snapshot->get_stack_trace(); 231 Handle stacktrace_h; 232 if (st != NULL) { 233 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK); 234 } else { 235 stacktrace_h = Handle(); 236 } 237 238 args->push_oop(snapshot_thread); 239 args->push_int(thread_status); 240 args->push_oop(Handle(THREAD, snapshot->blocker_object())); 241 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner())); 242 args->push_long(snapshot->contended_enter_count()); 243 args->push_long(contended_time); 244 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count()); 245 args->push_long(waited_time); 246 args->push_oop(stacktrace_h); 247} 248 249// Helper function to construct a ThreadInfo object 250instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) { 251 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL); 252 instanceKlassHandle ik (THREAD, k); 253 254 JavaValue result(T_VOID); 255 JavaCallArguments args(14); 256 257 // First allocate a ThreadObj object and 258 // push the receiver as the first argument 259 Handle element = ik->allocate_instance_handle(CHECK_NULL); 260 args.push_oop(element); 261 262 // initialize the arguments for the ThreadInfo constructor 263 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL); 264 265 // Call ThreadInfo constructor with no locked monitors and synchronizers 266 JavaCalls::call_special(&result, 267 ik, 268 vmSymbolHandles::object_initializer_name(), 269 vmSymbolHandles::java_lang_management_ThreadInfo_constructor_signature(), 270 &args, 271 CHECK_NULL); 272 273 return (instanceOop) element(); 274} 275 276instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, 277 objArrayHandle monitors_array, 278 typeArrayHandle depths_array, 279 objArrayHandle synchronizers_array, 280 TRAPS) { 281 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL); 282 instanceKlassHandle ik (THREAD, k); 283 284 JavaValue result(T_VOID); 285 JavaCallArguments args(17); 286 287 // First allocate a ThreadObj object and 288 // push the receiver as the first argument 289 Handle element = ik->allocate_instance_handle(CHECK_NULL); 290 args.push_oop(element); 291 292 // initialize the arguments for the ThreadInfo constructor 293 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL); 294 295 // push the locked monitors and synchronizers in the arguments 296 args.push_oop(monitors_array); 297 args.push_oop(depths_array); 298 args.push_oop(synchronizers_array); 299 300 // Call ThreadInfo constructor with locked monitors and synchronizers 301 JavaCalls::call_special(&result, 302 ik, 303 vmSymbolHandles::object_initializer_name(), 304 vmSymbolHandles::java_lang_management_ThreadInfo_with_locks_constructor_signature(), 305 &args, 306 CHECK_NULL); 307 308 return (instanceOop) element(); 309} 310 311// Helper functions 312static JavaThread* find_java_thread_from_id(jlong thread_id) { 313 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock"); 314 315 JavaThread* java_thread = NULL; 316 // Sequential search for now. Need to do better optimization later. 317 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) { 318 oop tobj = thread->threadObj(); 319 if (!thread->is_exiting() && 320 tobj != NULL && 321 thread_id == java_lang_Thread::thread_id(tobj)) { 322 java_thread = thread; 323 break; 324 } 325 } 326 return java_thread; 327} 328 329static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) { 330 if (mgr == NULL) { 331 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 332 } 333 oop mgr_obj = JNIHandles::resolve(mgr); 334 instanceHandle h(THREAD, (instanceOop) mgr_obj); 335 336 klassOop k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL); 337 if (!h->is_a(k)) { 338 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 339 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class", 340 NULL); 341 } 342 343 MemoryManager* gc = MemoryService::get_memory_manager(h); 344 if (gc == NULL || !gc->is_gc_memory_manager()) { 345 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 346 "Invalid GC memory manager", 347 NULL); 348 } 349 return (GCMemoryManager*) gc; 350} 351 352static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) { 353 if (obj == NULL) { 354 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 355 } 356 357 oop pool_obj = JNIHandles::resolve(obj); 358 assert(pool_obj->is_instance(), "Should be an instanceOop"); 359 instanceHandle ph(THREAD, (instanceOop) pool_obj); 360 361 return MemoryService::get_memory_pool(ph); 362} 363 364static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) { 365 int num_threads = ids_ah->length(); 366 // should be non-empty array 367 if (num_threads == 0) { 368 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 369 "Empty array of thread IDs"); 370 } 371 372 // Validate input thread IDs 373 int i = 0; 374 for (i = 0; i < num_threads; i++) { 375 jlong tid = ids_ah->long_at(i); 376 if (tid <= 0) { 377 // throw exception if invalid thread id. 378 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 379 "Invalid thread ID entry"); 380 } 381 } 382 383} 384 385static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) { 386 387 // check if the element of infoArray is of type ThreadInfo class 388 klassOop threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK); 389 klassOop element_klass = objArrayKlass::cast(infoArray_h->klass())->element_klass(); 390 if (element_klass != threadinfo_klass) { 391 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 392 "infoArray element type is not ThreadInfo class"); 393 } 394 395} 396 397 398static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) { 399 if (obj == NULL) { 400 THROW_(vmSymbols::java_lang_NullPointerException(), NULL); 401 } 402 403 oop mgr_obj = JNIHandles::resolve(obj); 404 assert(mgr_obj->is_instance(), "Should be an instanceOop"); 405 instanceHandle mh(THREAD, (instanceOop) mgr_obj); 406 407 return MemoryService::get_memory_manager(mh); 408} 409 410// Returns a version string and sets major and minor version if 411// the input parameters are non-null. 412JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env)) 413 return JMM_VERSION; 414JVM_END 415 416// Gets the list of VM monitoring and management optional supports 417// Returns 0 if succeeded; otherwise returns non-zero. 418JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support)) 419 if (support == NULL) { 420 return -1; 421 } 422 Management::get_optional_support(support); 423 return 0; 424JVM_END 425 426// Returns a java.lang.String object containing the input arguments to the VM. 427JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env)) 428 ResourceMark rm(THREAD); 429 430 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 431 return NULL; 432 } 433 434 char** vm_flags = Arguments::jvm_flags_array(); 435 char** vm_args = Arguments::jvm_args_array(); 436 int num_flags = Arguments::num_jvm_flags(); 437 int num_args = Arguments::num_jvm_args(); 438 439 size_t length = 1; // null terminator 440 int i; 441 for (i = 0; i < num_flags; i++) { 442 length += strlen(vm_flags[i]); 443 } 444 for (i = 0; i < num_args; i++) { 445 length += strlen(vm_args[i]); 446 } 447 // add a space between each argument 448 length += num_flags + num_args - 1; 449 450 // Return the list of input arguments passed to the VM 451 // and preserve the order that the VM processes. 452 char* args = NEW_RESOURCE_ARRAY(char, length); 453 args[0] = '\0'; 454 // concatenate all jvm_flags 455 if (num_flags > 0) { 456 strcat(args, vm_flags[0]); 457 for (i = 1; i < num_flags; i++) { 458 strcat(args, " "); 459 strcat(args, vm_flags[i]); 460 } 461 } 462 463 if (num_args > 0 && num_flags > 0) { 464 // append a space if args already contains one or more jvm_flags 465 strcat(args, " "); 466 } 467 468 // concatenate all jvm_args 469 if (num_args > 0) { 470 strcat(args, vm_args[0]); 471 for (i = 1; i < num_args; i++) { 472 strcat(args, " "); 473 strcat(args, vm_args[i]); 474 } 475 } 476 477 Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL); 478 return JNIHandles::make_local(env, hargs()); 479JVM_END 480 481// Returns an array of java.lang.String object containing the input arguments to the VM. 482JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env)) 483 ResourceMark rm(THREAD); 484 485 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { 486 return NULL; 487 } 488 489 char** vm_flags = Arguments::jvm_flags_array(); 490 char** vm_args = Arguments::jvm_args_array(); 491 int num_flags = Arguments::num_jvm_flags(); 492 int num_args = Arguments::num_jvm_args(); 493 494 instanceKlassHandle ik (THREAD, SystemDictionary::string_klass()); 495 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL); 496 objArrayHandle result_h(THREAD, r); 497 498 int index = 0; 499 for (int j = 0; j < num_flags; j++, index++) { 500 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); 501 result_h->obj_at_put(index, h()); 502 } 503 for (int i = 0; i < num_args; i++, index++) { 504 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); 505 result_h->obj_at_put(index, h()); 506 } 507 return (jobjectArray) JNIHandles::make_local(env, result_h()); 508JVM_END 509 510// Returns an array of java/lang/management/MemoryPoolMXBean object 511// one for each memory pool if obj == null; otherwise returns 512// an array of memory pools for a given memory manager if 513// it is a valid memory manager. 514JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj)) 515 ResourceMark rm(THREAD); 516 517 int num_memory_pools; 518 MemoryManager* mgr = NULL; 519 if (obj == NULL) { 520 num_memory_pools = MemoryService::num_memory_pools(); 521 } else { 522 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL); 523 if (mgr == NULL) { 524 return NULL; 525 } 526 num_memory_pools = mgr->num_memory_pools(); 527 } 528 529 // Allocate the resulting MemoryPoolMXBean[] object 530 klassOop k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL); 531 instanceKlassHandle ik (THREAD, k); 532 objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL); 533 objArrayHandle poolArray(THREAD, r); 534 535 if (mgr == NULL) { 536 // Get all memory pools 537 for (int i = 0; i < num_memory_pools; i++) { 538 MemoryPool* pool = MemoryService::get_memory_pool(i); 539 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL); 540 instanceHandle ph(THREAD, p); 541 poolArray->obj_at_put(i, ph()); 542 } 543 } else { 544 // Get memory pools managed by a given memory manager 545 for (int i = 0; i < num_memory_pools; i++) { 546 MemoryPool* pool = mgr->get_memory_pool(i); 547 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL); 548 instanceHandle ph(THREAD, p); 549 poolArray->obj_at_put(i, ph()); 550 } 551 } 552 return (jobjectArray) JNIHandles::make_local(env, poolArray()); 553JVM_END 554 555// Returns an array of java/lang/management/MemoryManagerMXBean object 556// one for each memory manager if obj == null; otherwise returns 557// an array of memory managers for a given memory pool if 558// it is a valid memory pool. 559JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj)) 560 ResourceMark rm(THREAD); 561 562 int num_mgrs; 563 MemoryPool* pool = NULL; 564 if (obj == NULL) { 565 num_mgrs = MemoryService::num_memory_managers(); 566 } else { 567 pool = get_memory_pool_from_jobject(obj, CHECK_NULL); 568 if (pool == NULL) { 569 return NULL; 570 } 571 num_mgrs = pool->num_memory_managers(); 572 } 573 574 // Allocate the resulting MemoryManagerMXBean[] object 575 klassOop k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL); 576 instanceKlassHandle ik (THREAD, k); 577 objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL); 578 objArrayHandle mgrArray(THREAD, r); 579 580 if (pool == NULL) { 581 // Get all memory managers 582 for (int i = 0; i < num_mgrs; i++) { 583 MemoryManager* mgr = MemoryService::get_memory_manager(i); 584 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL); 585 instanceHandle ph(THREAD, p); 586 mgrArray->obj_at_put(i, ph()); 587 } 588 } else { 589 // Get memory managers for a given memory pool 590 for (int i = 0; i < num_mgrs; i++) { 591 MemoryManager* mgr = pool->get_memory_manager(i); 592 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL); 593 instanceHandle ph(THREAD, p); 594 mgrArray->obj_at_put(i, ph()); 595 } 596 } 597 return (jobjectArray) JNIHandles::make_local(env, mgrArray()); 598JVM_END 599 600 601// Returns a java/lang/management/MemoryUsage object containing the memory usage 602// of a given memory pool. 603JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj)) 604 ResourceMark rm(THREAD); 605 606 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL); 607 if (pool != NULL) { 608 MemoryUsage usage = pool->get_memory_usage(); 609 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); 610 return JNIHandles::make_local(env, h()); 611 } else { 612 return NULL; 613 } 614JVM_END 615 616// Returns a java/lang/management/MemoryUsage object containing the memory usage 617// of a given memory pool. 618JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj)) 619 ResourceMark rm(THREAD); 620 621 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL); 622 if (pool != NULL) { 623 MemoryUsage usage = pool->get_peak_memory_usage(); 624 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); 625 return JNIHandles::make_local(env, h()); 626 } else { 627 return NULL; 628 } 629JVM_END 630 631// Returns a java/lang/management/MemoryUsage object containing the memory usage 632// of a given memory pool after most recent GC. 633JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj)) 634 ResourceMark rm(THREAD); 635 636 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL); 637 if (pool != NULL && pool->is_collected_pool()) { 638 MemoryUsage usage = pool->get_last_collection_usage(); 639 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); 640 return JNIHandles::make_local(env, h()); 641 } else { 642 return NULL; 643 } 644JVM_END 645 646// Sets the memory pool sensor for a threshold type 647JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj)) 648 if (obj == NULL || sensorObj == NULL) { 649 THROW(vmSymbols::java_lang_NullPointerException()); 650 } 651 652 klassOop sensor_klass = Management::sun_management_Sensor_klass(CHECK); 653 oop s = JNIHandles::resolve(sensorObj); 654 assert(s->is_instance(), "Sensor should be an instanceOop"); 655 instanceHandle sensor_h(THREAD, (instanceOop) s); 656 if (!sensor_h->is_a(sensor_klass)) { 657 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 658 "Sensor is not an instance of sun.management.Sensor class"); 659 } 660 661 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK); 662 assert(mpool != NULL, "MemoryPool should exist"); 663 664 switch (type) { 665 case JMM_USAGE_THRESHOLD_HIGH: 666 case JMM_USAGE_THRESHOLD_LOW: 667 // have only one sensor for threshold high and low 668 mpool->set_usage_sensor_obj(sensor_h); 669 break; 670 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH: 671 case JMM_COLLECTION_USAGE_THRESHOLD_LOW: 672 // have only one sensor for threshold high and low 673 mpool->set_gc_usage_sensor_obj(sensor_h); 674 break; 675 default: 676 assert(false, "Unrecognized type"); 677 } 678 679JVM_END 680 681 682// Sets the threshold of a given memory pool. 683// Returns the previous threshold. 684// 685// Input parameters: 686// pool - the MemoryPoolMXBean object 687// type - threshold type 688// threshold - the new threshold (must not be negative) 689// 690JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold)) 691 if (threshold < 0) { 692 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 693 "Invalid threshold value", 694 -1); 695 } 696 697 if (threshold > max_intx) { 698 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 699 "Invalid threshold value > max value of size_t", 700 -1); 701 } 702 703 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L)); 704 assert(pool != NULL, "MemoryPool should exist"); 705 706 jlong prev = 0; 707 switch (type) { 708 case JMM_USAGE_THRESHOLD_HIGH: 709 if (!pool->usage_threshold()->is_high_threshold_supported()) { 710 return -1; 711 } 712 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold); 713 break; 714 715 case JMM_USAGE_THRESHOLD_LOW: 716 if (!pool->usage_threshold()->is_low_threshold_supported()) { 717 return -1; 718 } 719 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold); 720 break; 721 722 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH: 723 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) { 724 return -1; 725 } 726 // return and the new threshold is effective for the next GC 727 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold); 728 729 case JMM_COLLECTION_USAGE_THRESHOLD_LOW: 730 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) { 731 return -1; 732 } 733 // return and the new threshold is effective for the next GC 734 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold); 735 736 default: 737 assert(false, "Unrecognized type"); 738 return -1; 739 } 740 741 // When the threshold is changed, reevaluate if the low memory 742 // detection is enabled. 743 if (prev != threshold) { 744 LowMemoryDetector::recompute_enabled_for_collected_pools(); 745 LowMemoryDetector::detect_low_memory(pool); 746 } 747 return prev; 748JVM_END 749 750// Returns a java/lang/management/MemoryUsage object representing 751// the memory usage for the heap or non-heap memory. 752JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap)) 753 ResourceMark rm(THREAD); 754 755 // Calculate the memory usage 756 size_t total_init = 0; 757 size_t total_used = 0; 758 size_t total_committed = 0; 759 size_t total_max = 0; 760 bool has_undefined_init_size = false; 761 bool has_undefined_max_size = false; 762 763 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 764 MemoryPool* pool = MemoryService::get_memory_pool(i); 765 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) { 766 MemoryUsage u = pool->get_memory_usage(); 767 total_used += u.used(); 768 total_committed += u.committed(); 769 770 // if any one of the memory pool has undefined init_size or max_size, 771 // set it to -1 772 if (u.init_size() == (size_t)-1) { 773 has_undefined_init_size = true; 774 } 775 if (!has_undefined_init_size) { 776 total_init += u.init_size(); 777 } 778 779 if (u.max_size() == (size_t)-1) { 780 has_undefined_max_size = true; 781 } 782 if (!has_undefined_max_size) { 783 total_max += u.max_size(); 784 } 785 } 786 } 787 788 // In our current implementation, all pools should have 789 // defined init and max size 790 assert(!has_undefined_init_size, "Undefined init size"); 791 assert(!has_undefined_max_size, "Undefined max size"); 792 793 MemoryUsage usage((heap ? Arguments::initial_heap_size() : total_init), 794 total_used, 795 total_committed, 796 (heap ? Universe::heap()->max_capacity() : total_max)); 797 798 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); 799 return JNIHandles::make_local(env, obj()); 800JVM_END 801 802// Returns the boolean value of a given attribute. 803JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att)) 804 switch (att) { 805 case JMM_VERBOSE_GC: 806 return MemoryService::get_verbose(); 807 case JMM_VERBOSE_CLASS: 808 return ClassLoadingService::get_verbose(); 809 case JMM_THREAD_CONTENTION_MONITORING: 810 return ThreadService::is_thread_monitoring_contention(); 811 case JMM_THREAD_CPU_TIME: 812 return ThreadService::is_thread_cpu_time_enabled(); 813 default: 814 assert(0, "Unrecognized attribute"); 815 return false; 816 } 817JVM_END 818 819// Sets the given boolean attribute and returns the previous value. 820JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag)) 821 switch (att) { 822 case JMM_VERBOSE_GC: 823 return MemoryService::set_verbose(flag != 0); 824 case JMM_VERBOSE_CLASS: 825 return ClassLoadingService::set_verbose(flag != 0); 826 case JMM_THREAD_CONTENTION_MONITORING: 827 return ThreadService::set_thread_monitoring_contention(flag != 0); 828 case JMM_THREAD_CPU_TIME: 829 return ThreadService::set_thread_cpu_time_enabled(flag != 0); 830 default: 831 assert(0, "Unrecognized attribute"); 832 return false; 833 } 834JVM_END 835 836 837static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) { 838 switch (att) { 839 case JMM_GC_TIME_MS: 840 return mgr->gc_time_ms(); 841 842 case JMM_GC_COUNT: 843 return mgr->gc_count(); 844 845 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE: 846 // current implementation only has 1 ext attribute 847 return 1; 848 849 default: 850 assert(0, "Unrecognized GC attribute"); 851 return -1; 852 } 853} 854 855class VmThreadCountClosure: public ThreadClosure { 856 private: 857 int _count; 858 public: 859 VmThreadCountClosure() : _count(0) {}; 860 void do_thread(Thread* thread); 861 int count() { return _count; } 862}; 863 864void VmThreadCountClosure::do_thread(Thread* thread) { 865 // exclude externally visible JavaThreads 866 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) { 867 return; 868 } 869 870 _count++; 871} 872 873static jint get_vm_thread_count() { 874 VmThreadCountClosure vmtcc; 875 { 876 MutexLockerEx ml(Threads_lock); 877 Threads::threads_do(&vmtcc); 878 } 879 880 return vmtcc.count(); 881} 882 883static jint get_num_flags() { 884 // last flag entry is always NULL, so subtract 1 885 int nFlags = (int) Flag::numFlags - 1; 886 int count = 0; 887 for (int i = 0; i < nFlags; i++) { 888 Flag* flag = &Flag::flags[i]; 889 // Exclude the diagnostic flags 890 if (flag->is_unlocked() || flag->is_unlocker()) { 891 count++; 892 } 893 } 894 return count; 895} 896 897static jlong get_long_attribute(jmmLongAttribute att) { 898 switch (att) { 899 case JMM_CLASS_LOADED_COUNT: 900 return ClassLoadingService::loaded_class_count(); 901 902 case JMM_CLASS_UNLOADED_COUNT: 903 return ClassLoadingService::unloaded_class_count(); 904 905 case JMM_THREAD_TOTAL_COUNT: 906 return ThreadService::get_total_thread_count(); 907 908 case JMM_THREAD_LIVE_COUNT: 909 return ThreadService::get_live_thread_count(); 910 911 case JMM_THREAD_PEAK_COUNT: 912 return ThreadService::get_peak_thread_count(); 913 914 case JMM_THREAD_DAEMON_COUNT: 915 return ThreadService::get_daemon_thread_count(); 916 917 case JMM_JVM_INIT_DONE_TIME_MS: 918 return Management::vm_init_done_time(); 919 920 case JMM_COMPILE_TOTAL_TIME_MS: 921 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks()); 922 923 case JMM_OS_PROCESS_ID: 924 return os::current_process_id(); 925 926 // Hotspot-specific counters 927 case JMM_CLASS_LOADED_BYTES: 928 return ClassLoadingService::loaded_class_bytes(); 929 930 case JMM_CLASS_UNLOADED_BYTES: 931 return ClassLoadingService::unloaded_class_bytes(); 932 933 case JMM_SHARED_CLASS_LOADED_COUNT: 934 return ClassLoadingService::loaded_shared_class_count(); 935 936 case JMM_SHARED_CLASS_UNLOADED_COUNT: 937 return ClassLoadingService::unloaded_shared_class_count(); 938 939 940 case JMM_SHARED_CLASS_LOADED_BYTES: 941 return ClassLoadingService::loaded_shared_class_bytes(); 942 943 case JMM_SHARED_CLASS_UNLOADED_BYTES: 944 return ClassLoadingService::unloaded_shared_class_bytes(); 945 946 case JMM_TOTAL_CLASSLOAD_TIME_MS: 947 return ClassLoader::classloader_time_ms(); 948 949 case JMM_VM_GLOBAL_COUNT: 950 return get_num_flags(); 951 952 case JMM_SAFEPOINT_COUNT: 953 return RuntimeService::safepoint_count(); 954 955 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS: 956 return RuntimeService::safepoint_sync_time_ms(); 957 958 case JMM_TOTAL_STOPPED_TIME_MS: 959 return RuntimeService::safepoint_time_ms(); 960 961 case JMM_TOTAL_APP_TIME_MS: 962 return RuntimeService::application_time_ms(); 963 964 case JMM_VM_THREAD_COUNT: 965 return get_vm_thread_count(); 966 967 case JMM_CLASS_INIT_TOTAL_COUNT: 968 return ClassLoader::class_init_count(); 969 970 case JMM_CLASS_INIT_TOTAL_TIME_MS: 971 return ClassLoader::class_init_time_ms(); 972 973 case JMM_CLASS_VERIFY_TOTAL_TIME_MS: 974 return ClassLoader::class_verify_time_ms(); 975 976 case JMM_METHOD_DATA_SIZE_BYTES: 977 return ClassLoadingService::class_method_data_size(); 978 979 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES: 980 return os::physical_memory(); 981 982 default: 983 return -1; 984 } 985} 986 987 988// Returns the long value of a given attribute. 989JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att)) 990 if (obj == NULL) { 991 return get_long_attribute(att); 992 } else { 993 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L)); 994 if (mgr != NULL) { 995 return get_gc_attribute(mgr, att); 996 } 997 } 998 return -1; 999JVM_END 1000 1001// Gets the value of all attributes specified in the given array 1002// and sets the value in the result array. 1003// Returns the number of attributes found. 1004JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env, 1005 jobject obj, 1006 jmmLongAttribute* atts, 1007 jint count, 1008 jlong* result)) 1009 1010 int num_atts = 0; 1011 if (obj == NULL) { 1012 for (int i = 0; i < count; i++) { 1013 result[i] = get_long_attribute(atts[i]); 1014 if (result[i] != -1) { 1015 num_atts++; 1016 } 1017 } 1018 } else { 1019 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0); 1020 for (int i = 0; i < count; i++) { 1021 result[i] = get_gc_attribute(mgr, atts[i]); 1022 if (result[i] != -1) { 1023 num_atts++; 1024 } 1025 } 1026 } 1027 return num_atts; 1028JVM_END 1029 1030// Helper function to do thread dump for a specific list of threads 1031static void do_thread_dump(ThreadDumpResult* dump_result, 1032 typeArrayHandle ids_ah, // array of thread ID (long[]) 1033 int num_threads, 1034 int max_depth, 1035 bool with_locked_monitors, 1036 bool with_locked_synchronizers, 1037 TRAPS) { 1038 1039 // First get an array of threadObj handles. 1040 // A JavaThread may terminate before we get the stack trace. 1041 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 1042 { 1043 MutexLockerEx ml(Threads_lock); 1044 for (int i = 0; i < num_threads; i++) { 1045 jlong tid = ids_ah->long_at(i); 1046 JavaThread* jt = find_java_thread_from_id(tid); 1047 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL); 1048 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj); 1049 thread_handle_array->append(threadObj_h); 1050 } 1051 } 1052 1053 // Obtain thread dumps and thread snapshot information 1054 VM_ThreadDump op(dump_result, 1055 thread_handle_array, 1056 num_threads, 1057 max_depth, /* stack depth */ 1058 with_locked_monitors, 1059 with_locked_synchronizers); 1060 VMThread::execute(&op); 1061} 1062 1063// Gets an array of ThreadInfo objects. Each element is the ThreadInfo 1064// for the thread ID specified in the corresponding entry in 1065// the given array of thread IDs; or NULL if the thread does not exist 1066// or has terminated. 1067// 1068// Input parameters: 1069// ids - array of thread IDs 1070// maxDepth - the maximum depth of stack traces to be dumped: 1071// maxDepth == -1 requests to dump entire stack trace. 1072// maxDepth == 0 requests no stack trace. 1073// infoArray - array of ThreadInfo objects 1074// 1075JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray)) 1076 // Check if threads is null 1077 if (ids == NULL || infoArray == NULL) { 1078 THROW_(vmSymbols::java_lang_NullPointerException(), -1); 1079 } 1080 1081 if (maxDepth < -1) { 1082 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1083 "Invalid maxDepth", -1); 1084 } 1085 1086 ResourceMark rm(THREAD); 1087 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids)); 1088 typeArrayHandle ids_ah(THREAD, ta); 1089 1090 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray); 1091 objArrayOop oa = objArrayOop(infoArray_obj); 1092 objArrayHandle infoArray_h(THREAD, oa); 1093 1094 // validate the thread id array 1095 validate_thread_id_array(ids_ah, CHECK_0); 1096 1097 // validate the ThreadInfo[] parameters 1098 validate_thread_info_array(infoArray_h, CHECK_0); 1099 1100 // infoArray must be of the same length as the given array of thread IDs 1101 int num_threads = ids_ah->length(); 1102 if (num_threads != infoArray_h->length()) { 1103 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1104 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1); 1105 } 1106 1107 if (JDK_Version::is_gte_jdk16x_version()) { 1108 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots 1109 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0); 1110 } 1111 1112 // Must use ThreadDumpResult to store the ThreadSnapshot. 1113 // GC may occur after the thread snapshots are taken but before 1114 // this function returns. The threadObj and other oops kept 1115 // in the ThreadSnapshot are marked and adjusted during GC. 1116 ThreadDumpResult dump_result(num_threads); 1117 1118 if (maxDepth == 0) { 1119 // no stack trace dumped - do not need to stop the world 1120 { 1121 MutexLockerEx ml(Threads_lock); 1122 for (int i = 0; i < num_threads; i++) { 1123 jlong tid = ids_ah->long_at(i); 1124 JavaThread* jt = find_java_thread_from_id(tid); 1125 ThreadSnapshot* ts; 1126 if (jt == NULL) { 1127 // if the thread does not exist or now it is terminated, 1128 // create dummy snapshot 1129 ts = new ThreadSnapshot(); 1130 } else { 1131 ts = new ThreadSnapshot(jt); 1132 } 1133 dump_result.add_thread_snapshot(ts); 1134 } 1135 } 1136 } else { 1137 // obtain thread dump with the specific list of threads with stack trace 1138 1139 do_thread_dump(&dump_result, 1140 ids_ah, 1141 num_threads, 1142 maxDepth, 1143 false, /* no locked monitor */ 1144 false, /* no locked synchronizers */ 1145 CHECK_0); 1146 } 1147 1148 int num_snapshots = dump_result.num_snapshots(); 1149 assert(num_snapshots == num_threads, "Must match the number of thread snapshots"); 1150 int index = 0; 1151 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) { 1152 // For each thread, create an java/lang/management/ThreadInfo object 1153 // and fill with the thread information 1154 1155 if (ts->threadObj() == NULL) { 1156 // if the thread does not exist or now it is terminated, set threadinfo to NULL 1157 infoArray_h->obj_at_put(index, NULL); 1158 continue; 1159 } 1160 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); 1164 } 1165 return 0; 1166JVM_END 1167 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. 1173// 1174// Input parameter: 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 1178// 1179JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers)) 1180 ResourceMark rm(THREAD); 1181 1182 if (JDK_Version::is_gte_jdk16x_version()) { 1183 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots 1184 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL); 1185 } 1186 1187 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids)); 1188 int num_threads = (ta != NULL ? ta->length() : 0); 1189 typeArrayHandle ids_ah(THREAD, ta); 1190 1191 ThreadDumpResult dump_result(num_threads); // can safepoint 1192 1193 if (ids_ah() != NULL) { 1194 1195 // validate the thread id array 1196 validate_thread_id_array(ids_ah, CHECK_NULL); 1197 1198 // obtain thread dump of a specific list of threads 1199 do_thread_dump(&dump_result, 1200 ids_ah, 1201 num_threads, 1202 -1, /* entire stack */ 1203 (locked_monitors ? true : false), /* with locked monitors */ 1204 (locked_synchronizers ? true : false), /* with locked synchronizers */ 1205 CHECK_NULL); 1206 } else { 1207 // obtain thread dump of all threads 1208 VM_ThreadDump op(&dump_result, 1209 -1, /* entire stack */ 1210 (locked_monitors ? true : false), /* with locked monitors */ 1211 (locked_synchronizers ? true : false) /* with locked synchronizers */); 1212 VMThread::execute(&op); 1213 } 1214 1215 int num_snapshots = dump_result.num_snapshots(); 1216 1217 // create the result ThreadInfo[] object 1218 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL); 1219 instanceKlassHandle ik (THREAD, k); 1220 objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL); 1221 objArrayHandle result_h(THREAD, r); 1222 1223 int index = 0; 1224 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) { 1225 if (ts->threadObj() == NULL) { 1226 // if the thread does not exist or now it is terminated, set threadinfo to NULL 1227 result_h->obj_at_put(index, NULL); 1228 continue; 1229 } 1230 1231 1232 1233 ThreadStackTrace* stacktrace = ts->get_stack_trace(); 1234 assert(stacktrace != NULL, "Must have a stack trace dumped"); 1235 1236 // Create Object[] filled with locked monitors 1237 // Create int[] filled with the stack depth where a monitor was locked 1238 int num_frames = stacktrace->get_stack_depth(); 1239 int num_locked_monitors = stacktrace->num_jni_locked_monitors(); 1240 1241 // Count the total number of locked monitors 1242 for (int i = 0; i < num_frames; i++) { 1243 StackFrameInfo* frame = stacktrace->stack_frame_at(i); 1244 num_locked_monitors += frame->num_locked_monitors(); 1245 } 1246 1247 objArrayHandle monitors_array; 1248 typeArrayHandle depths_array; 1249 objArrayHandle synchronizers_array; 1250 1251 if (locked_monitors) { 1252 // Constructs Object[] and int[] to contain the object monitor and the stack depth 1253 // where the thread locked it 1254 objArrayOop array = oopFactory::new_system_objArray(num_locked_monitors, CHECK_NULL); 1255 objArrayHandle mh(THREAD, array); 1256 monitors_array = mh; 1257 1258 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL); 1259 typeArrayHandle dh(THREAD, tarray); 1260 depths_array = dh; 1261 1262 int count = 0; 1263 int j = 0; 1264 for (int depth = 0; depth < num_frames; depth++) { 1265 StackFrameInfo* frame = stacktrace->stack_frame_at(depth); 1266 int len = frame->num_locked_monitors(); 1267 GrowableArray<oop>* locked_monitors = frame->locked_monitors(); 1268 for (j = 0; j < len; j++) { 1269 oop monitor = locked_monitors->at(j); 1270 assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); 1271 monitors_array->obj_at_put(count, monitor); 1272 depths_array->int_at_put(count, depth); 1273 count++; 1274 } 1275 } 1276 1277 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors(); 1278 for (j = 0; j < jni_locked_monitors->length(); j++) { 1279 oop object = jni_locked_monitors->at(j); 1280 assert(object != NULL && object->is_instance(), "must be a Java object"); 1281 monitors_array->obj_at_put(count, object); 1282 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info 1283 depths_array->int_at_put(count, -1); 1284 count++; 1285 } 1286 assert(count == num_locked_monitors, "number of locked monitors doesn't match"); 1287 } 1288 1289 if (locked_synchronizers) { 1290 // Create Object[] filled with locked JSR-166 synchronizers 1291 assert(ts->threadObj() != NULL, "Must be a valid JavaThread"); 1292 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks(); 1293 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL); 1294 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0); 1295 1296 objArrayOop array = oopFactory::new_system_objArray(num_locked_synchronizers, CHECK_NULL); 1297 objArrayHandle sh(THREAD, array); 1298 synchronizers_array = sh; 1299 1300 for (int k = 0; k < num_locked_synchronizers; k++) { 1301 synchronizers_array->obj_at_put(k, locks->at(k)); 1302 } 1303 } 1304 1305 // Create java.lang.management.ThreadInfo object 1306 instanceOop info_obj = Management::create_thread_info_instance(ts, 1307 monitors_array, 1308 depths_array, 1309 synchronizers_array, 1310 CHECK_NULL); 1311 result_h->obj_at_put(index, info_obj); 1312 } 1313 1314 return (jobjectArray) JNIHandles::make_local(env, result_h()); 1315JVM_END 1316 1317// Returns an array of Class objects. 1318JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env)) 1319 ResourceMark rm(THREAD); 1320 1321 LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter 1322 1323 int num_classes = lce.num_loaded_classes(); 1324 objArrayOop r = oopFactory::new_objArray(SystemDictionary::class_klass(), num_classes, CHECK_0); 1325 objArrayHandle classes_ah(THREAD, r); 1326 1327 for (int i = 0; i < num_classes; i++) { 1328 KlassHandle kh = lce.get_klass(i); 1329 oop mirror = Klass::cast(kh())->java_mirror(); 1330 classes_ah->obj_at_put(i, mirror); 1331 } 1332 1333 return (jobjectArray) JNIHandles::make_local(env, classes_ah()); 1334JVM_END 1335 1336// Reset statistic. Return true if the requested statistic is reset. 1337// Otherwise, return false. 1338// 1339// Input parameters: 1340// obj - specify which instance the statistic associated with to be reset 1341// For PEAK_POOL_USAGE stat, obj is required to be a memory pool object. 1342// For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID. 1343// type - the type of statistic to be reset 1344// 1345JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type)) 1346 ResourceMark rm(THREAD); 1347 1348 switch (type) { 1349 case JMM_STAT_PEAK_THREAD_COUNT: 1350 ThreadService::reset_peak_thread_count(); 1351 return true; 1352 1353 case JMM_STAT_THREAD_CONTENTION_COUNT: 1354 case JMM_STAT_THREAD_CONTENTION_TIME: { 1355 jlong tid = obj.j; 1356 if (tid < 0) { 1357 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE); 1358 } 1359 1360 // Look for the JavaThread of this given tid 1361 MutexLockerEx ml(Threads_lock); 1362 if (tid == 0) { 1363 // reset contention statistics for all threads if tid == 0 1364 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) { 1365 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) { 1366 ThreadService::reset_contention_count_stat(java_thread); 1367 } else { 1368 ThreadService::reset_contention_time_stat(java_thread); 1369 } 1370 } 1371 } else { 1372 // reset contention statistics for a given thread 1373 JavaThread* java_thread = find_java_thread_from_id(tid); 1374 if (java_thread == NULL) { 1375 return false; 1376 } 1377 1378 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) { 1379 ThreadService::reset_contention_count_stat(java_thread); 1380 } else { 1381 ThreadService::reset_contention_time_stat(java_thread); 1382 } 1383 } 1384 return true; 1385 break; 1386 } 1387 case JMM_STAT_PEAK_POOL_USAGE: { 1388 jobject o = obj.l; 1389 if (o == NULL) { 1390 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1391 } 1392 1393 oop pool_obj = JNIHandles::resolve(o); 1394 assert(pool_obj->is_instance(), "Should be an instanceOop"); 1395 instanceHandle ph(THREAD, (instanceOop) pool_obj); 1396 1397 MemoryPool* pool = MemoryService::get_memory_pool(ph); 1398 if (pool != NULL) { 1399 pool->reset_peak_memory_usage(); 1400 return true; 1401 } 1402 break; 1403 } 1404 case JMM_STAT_GC_STAT: { 1405 jobject o = obj.l; 1406 if (o == NULL) { 1407 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1408 } 1409 1410 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0); 1411 if (mgr != NULL) { 1412 mgr->reset_gc_stat(); 1413 return true; 1414 } 1415 break; 1416 } 1417 default: 1418 assert(0, "Unknown Statistic Type"); 1419 } 1420 return false; 1421JVM_END 1422 1423// Returns the fast estimate of CPU time consumed by 1424// a given thread (in nanoseconds). 1425// If thread_id == 0, return CPU time for the current thread. 1426JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id)) 1427 if (!os::is_thread_cpu_time_supported()) { 1428 return -1; 1429 } 1430 1431 if (thread_id < 0) { 1432 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1433 "Invalid thread ID", -1); 1434 } 1435 1436 JavaThread* java_thread = NULL; 1437 if (thread_id == 0) { 1438 // current thread 1439 return os::current_thread_cpu_time(); 1440 } else { 1441 MutexLockerEx ml(Threads_lock); 1442 java_thread = find_java_thread_from_id(thread_id); 1443 if (java_thread != NULL) { 1444 return os::thread_cpu_time((Thread*) java_thread); 1445 } 1446 } 1447 return -1; 1448JVM_END 1449 1450// Returns the CPU time consumed by a given thread (in nanoseconds). 1451// If thread_id == 0, CPU time for the current thread is returned. 1452// If user_sys_cpu_time = true, user level and system CPU time of 1453// a given thread is returned; otherwise, only user level CPU time 1454// is returned. 1455JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time)) 1456 if (!os::is_thread_cpu_time_supported()) { 1457 return -1; 1458 } 1459 1460 if (thread_id < 0) { 1461 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1462 "Invalid thread ID", -1); 1463 } 1464 1465 JavaThread* java_thread = NULL; 1466 if (thread_id == 0) { 1467 // current thread 1468 return os::current_thread_cpu_time(user_sys_cpu_time != 0); 1469 } else { 1470 MutexLockerEx ml(Threads_lock); 1471 java_thread = find_java_thread_from_id(thread_id); 1472 if (java_thread != NULL) { 1473 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0); 1474 } 1475 } 1476 return -1; 1477JVM_END 1478 1479// Returns a String array of all VM global flag names 1480JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env)) 1481 // last flag entry is always NULL, so subtract 1 1482 int nFlags = (int) Flag::numFlags - 1; 1483 // allocate a temp array 1484 objArrayOop r = oopFactory::new_objArray(SystemDictionary::string_klass(), 1485 nFlags, CHECK_0); 1486 objArrayHandle flags_ah(THREAD, r); 1487 int num_entries = 0; 1488 for (int i = 0; i < nFlags; i++) { 1489 Flag* flag = &Flag::flags[i]; 1490 // Exclude the diagnostic flags 1491 if (flag->is_unlocked() || flag->is_unlocker()) { 1492 Handle s = java_lang_String::create_from_str(flag->name, CHECK_0); 1493 flags_ah->obj_at_put(num_entries, s()); 1494 num_entries++; 1495 } 1496 } 1497 1498 if (num_entries < nFlags) { 1499 // Return array of right length 1500 objArrayOop res = oopFactory::new_objArray(SystemDictionary::string_klass(), num_entries, CHECK_0); 1501 for(int i = 0; i < num_entries; i++) { 1502 res->obj_at_put(i, flags_ah->obj_at(i)); 1503 } 1504 return (jobjectArray)JNIHandles::make_local(env, res); 1505 } 1506 1507 return (jobjectArray)JNIHandles::make_local(env, flags_ah()); 1508JVM_END 1509 1510// utility function used by jmm_GetVMGlobals 1511void add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) { 1512 Handle flag_name; 1513 if (name() == NULL) { 1514 flag_name = java_lang_String::create_from_str(flag->name, CHECK); 1515 } else { 1516 flag_name = name; 1517 } 1518 global->name = (jstring)JNIHandles::make_local(env, flag_name()); 1519 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN; 1520 1521 if (flag->is_bool()) { 1522 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE; 1523 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN; 1524 } else if (flag->is_intx()) { 1525 global->value.j = (jlong)flag->get_intx(); 1526 global->type = JMM_VMGLOBAL_TYPE_JLONG; 1527 } else if (flag->is_uintx()) { 1528 global->value.j = (jlong)flag->get_uintx(); 1529 global->type = JMM_VMGLOBAL_TYPE_JLONG; 1530 } else if (flag->is_ccstr()) { 1531 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK); 1532 global->value.l = (jobject)JNIHandles::make_local(env, str()); 1533 global->type = JMM_VMGLOBAL_TYPE_JSTRING; 1534 } 1535 1536 global->writeable = flag->is_writeable(); 1537 global->external = flag->is_external(); 1538 switch (flag->origin) { 1539 case DEFAULT: 1540 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT; 1541 break; 1542 case COMMAND_LINE: 1543 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE; 1544 break; 1545 case ENVIRON_VAR: 1546 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR; 1547 break; 1548 case CONFIG_FILE: 1549 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE; 1550 break; 1551 case MANAGEMENT: 1552 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT; 1553 break; 1554 case ERGONOMIC: 1555 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC; 1556 break; 1557 default: 1558 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER; 1559 } 1560} 1561 1562// Fill globals array of count length with jmmVMGlobal entries 1563// specified by names. If names == NULL, fill globals array 1564// with all Flags. Return value is number of entries 1565// created in globals. 1566// If a Flag with a given name in an array element does not 1567// exist, globals[i].name will be set to NULL. 1568JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env, 1569 jobjectArray names, 1570 jmmVMGlobal *globals, 1571 jint count)) 1572 1573 1574 if (globals == NULL) { 1575 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1576 } 1577 1578 ResourceMark rm(THREAD); 1579 1580 if (names != NULL) { 1581 // return the requested globals 1582 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names)); 1583 objArrayHandle names_ah(THREAD, ta); 1584 // Make sure we have a String array 1585 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass(); 1586 if (element_klass != SystemDictionary::string_klass()) { 1587 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1588 "Array element type is not String class", 0); 1589 } 1590 1591 int names_length = names_ah->length(); 1592 int num_entries = 0; 1593 for (int i = 0; i < names_length && i < count; i++) { 1594 oop s = names_ah->obj_at(i); 1595 if (s == NULL) { 1596 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1597 } 1598 1599 Handle sh(THREAD, s); 1600 char* str = java_lang_String::as_utf8_string(s); 1601 Flag* flag = Flag::find_flag(str, strlen(str)); 1602 if (flag != NULL) { 1603 add_global_entry(env, sh, &globals[i], flag, THREAD); 1604 num_entries++; 1605 } else { 1606 globals[i].name = NULL; 1607 } 1608 } 1609 return num_entries; 1610 } else { 1611 // return all globals if names == NULL 1612 1613 // last flag entry is always NULL, so subtract 1 1614 int nFlags = (int) Flag::numFlags - 1; 1615 Handle null_h; 1616 int num_entries = 0; 1617 for (int i = 0; i < nFlags && num_entries < count; i++) { 1618 Flag* flag = &Flag::flags[i]; 1619 // Exclude the diagnostic flags 1620 if (flag->is_unlocked() || flag->is_unlocker()) { 1621 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD); 1622 num_entries++; 1623 } 1624 } 1625 return num_entries; 1626 } 1627JVM_END 1628 1629JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value)) 1630 ResourceMark rm(THREAD); 1631 1632 oop fn = JNIHandles::resolve_external_guard(flag_name); 1633 if (fn == NULL) { 1634 THROW_MSG(vmSymbols::java_lang_NullPointerException(), 1635 "The flag name cannot be null."); 1636 } 1637 char* name = java_lang_String::as_utf8_string(fn); 1638 Flag* flag = Flag::find_flag(name, strlen(name)); 1639 if (flag == NULL) { 1640 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 1641 "Flag does not exist."); 1642 } 1643 if (!flag->is_writeable()) { 1644 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 1645 "This flag is not writeable."); 1646 } 1647 1648 bool succeed; 1649 if (flag->is_bool()) { 1650 bool bvalue = (new_value.z == JNI_TRUE ? true : false); 1651 succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT); 1652 } else if (flag->is_intx()) { 1653 intx ivalue = new_value.j; 1654 succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT); 1655 } else if (flag->is_uintx()) { 1656 uintx uvalue = new_value.j; 1657 succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT); 1658 } else if (flag->is_ccstr()) { 1659 oop str = JNIHandles::resolve_external_guard(new_value.l); 1660 if (str == NULL) { 1661 THROW(vmSymbols::java_lang_NullPointerException()); 1662 } 1663 ccstr svalue = java_lang_String::as_utf8_string(str); 1664 succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT); 1665 } 1666 assert(succeed, "Setting flag should succeed"); 1667JVM_END 1668 1669class ThreadTimesClosure: public ThreadClosure { 1670 private: 1671 objArrayOop _names; 1672 typeArrayOop _times; 1673 int _names_len; 1674 int _times_len; 1675 int _count; 1676 1677 public: 1678 ThreadTimesClosure(objArrayOop names, typeArrayOop times); 1679 virtual void do_thread(Thread* thread); 1680 int count() { return _count; } 1681}; 1682 1683ThreadTimesClosure::ThreadTimesClosure(objArrayOop names, 1684 typeArrayOop times) { 1685 assert(names != NULL, "names was NULL"); 1686 assert(times != NULL, "times was NULL"); 1687 _names = names; 1688 _names_len = names->length(); 1689 _times = times; 1690 _times_len = times->length(); 1691 _count = 0; 1692} 1693 1694void ThreadTimesClosure::do_thread(Thread* thread) { 1695 Handle s; 1696 assert(thread != NULL, "thread was NULL"); 1697 1698 // exclude externally visible JavaThreads 1699 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) { 1700 return; 1701 } 1702 1703 if (_count >= _names_len || _count >= _times_len) { 1704 // skip if the result array is not big enough 1705 return; 1706 } 1707 1708 EXCEPTION_MARK; 1709 1710 assert(thread->name() != NULL, "All threads should have a name"); 1711 s = java_lang_String::create_from_str(thread->name(), CHECK); 1712 _names->obj_at_put(_count, s()); 1713 1714 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ? 1715 os::thread_cpu_time(thread) : -1); 1716 _count++; 1717} 1718 1719// Fills names with VM internal thread names and times with the corresponding 1720// CPU times. If names or times is NULL, a NullPointerException is thrown. 1721// If the element type of names is not String, an IllegalArgumentException is 1722// thrown. 1723// If an array is not large enough to hold all the entries, only the entries 1724// that fit will be returned. Return value is the number of VM internal 1725// threads entries. 1726JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env, 1727 jobjectArray names, 1728 jlongArray times)) 1729 if (names == NULL || times == NULL) { 1730 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1731 } 1732 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names)); 1733 objArrayHandle names_ah(THREAD, na); 1734 1735 // Make sure we have a String array 1736 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass(); 1737 if (element_klass != SystemDictionary::string_klass()) { 1738 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1739 "Array element type is not String class", 0); 1740 } 1741 1742 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times)); 1743 typeArrayHandle times_ah(THREAD, ta); 1744 1745 ThreadTimesClosure ttc(names_ah(), times_ah()); 1746 { 1747 MutexLockerEx ml(Threads_lock); 1748 Threads::threads_do(&ttc); 1749 } 1750 1751 return ttc.count(); 1752JVM_END 1753 1754static Handle find_deadlocks(bool object_monitors_only, TRAPS) { 1755 ResourceMark rm(THREAD); 1756 1757 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */); 1758 VMThread::execute(&op); 1759 1760 DeadlockCycle* deadlocks = op.result(); 1761 if (deadlocks == NULL) { 1762 // no deadlock found and return 1763 return Handle(); 1764 } 1765 1766 int num_threads = 0; 1767 DeadlockCycle* cycle; 1768 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) { 1769 num_threads += cycle->num_threads(); 1770 } 1771 1772 objArrayOop r = oopFactory::new_objArray(SystemDictionary::thread_klass(), num_threads, CHECK_NH); 1773 objArrayHandle threads_ah(THREAD, r); 1774 1775 int index = 0; 1776 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) { 1777 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads(); 1778 int len = deadlock_threads->length(); 1779 for (int i = 0; i < len; i++) { 1780 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj()); 1781 index++; 1782 } 1783 } 1784 return threads_ah; 1785} 1786 1787// Finds cycles of threads that are deadlocked involved in object monitors 1788// and JSR-166 synchronizers. 1789// Returns an array of Thread objects which are in deadlock, if any. 1790// Otherwise, returns NULL. 1791// 1792// Input parameter: 1793// object_monitors_only - if true, only check object monitors 1794// 1795JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only)) 1796 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0); 1797 return (jobjectArray) JNIHandles::make_local(env, result()); 1798JVM_END 1799 1800// Finds cycles of threads that are deadlocked on monitor locks 1801// Returns an array of Thread objects which are in deadlock, if any. 1802// Otherwise, returns NULL. 1803JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env)) 1804 Handle result = find_deadlocks(true, CHECK_0); 1805 return (jobjectArray) JNIHandles::make_local(env, result()); 1806JVM_END 1807 1808// Gets the information about GC extension attributes including 1809// the name of the attribute, its type, and a short description. 1810// 1811// Input parameters: 1812// mgr - GC memory manager 1813// info - caller allocated array of jmmExtAttributeInfo 1814// count - number of elements of the info array 1815// 1816// Returns the number of GC extension attributes filled in the info array; or 1817// -1 if info is not big enough 1818// 1819JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count)) 1820 // All GC memory managers have 1 attribute (number of GC threads) 1821 if (count == 0) { 1822 return 0; 1823 } 1824 1825 if (info == NULL) { 1826 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1827 } 1828 1829 info[0].name = "GcThreadCount"; 1830 info[0].type = 'I'; 1831 info[0].description = "Number of GC threads"; 1832 return 1; 1833JVM_END 1834 1835// verify the given array is an array of java/lang/management/MemoryUsage objects 1836// of a given length and return the objArrayOop 1837static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) { 1838 if (array == NULL) { 1839 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1840 } 1841 1842 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array)); 1843 objArrayHandle array_h(THREAD, oa); 1844 1845 // array must be of the given length 1846 if (length != array_h->length()) { 1847 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1848 "The length of the given MemoryUsage array does not match the number of memory pools.", 0); 1849 } 1850 1851 // check if the element of array is of type MemoryUsage class 1852 klassOop usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0); 1853 klassOop element_klass = objArrayKlass::cast(array_h->klass())->element_klass(); 1854 if (element_klass != usage_klass) { 1855 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1856 "The element type is not MemoryUsage class", 0); 1857 } 1858 1859 return array_h(); 1860} 1861 1862// Gets the statistics of the last GC of a given GC memory manager. 1863// Input parameters: 1864// obj - GarbageCollectorMXBean object 1865// gc_stat - caller allocated jmmGCStat where: 1866// a. before_gc_usage - array of MemoryUsage objects 1867// b. after_gc_usage - array of MemoryUsage objects 1868// c. gc_ext_attributes_values_size is set to the 1869// gc_ext_attribute_values array allocated 1870// d. gc_ext_attribute_values is a caller allocated array of jvalue. 1871// 1872// On return, 1873// gc_index == 0 indicates no GC statistics available 1874// 1875// before_gc_usage and after_gc_usage - filled with per memory pool 1876// before and after GC usage in the same order as the memory pools 1877// returned by GetMemoryPools for a given GC memory manager. 1878// num_gc_ext_attributes indicates the number of elements in 1879// the gc_ext_attribute_values array is filled; or 1880// -1 if the gc_ext_attributes_values array is not big enough 1881// 1882JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat)) 1883 ResourceMark rm(THREAD); 1884 1885 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) { 1886 THROW(vmSymbols::java_lang_NullPointerException()); 1887 } 1888 1889 // Get the GCMemoryManager 1890 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK); 1891 if (mgr->last_gc_stat() == NULL) { 1892 gc_stat->gc_index = 0; 1893 return; 1894 } 1895 1896 // Make a copy of the last GC statistics 1897 // GC may occur while constructing the last GC information 1898 int num_pools = MemoryService::num_memory_pools(); 1899 GCStatInfo* stat = new GCStatInfo(num_pools); 1900 stat->copy_stat(mgr->last_gc_stat()); 1901 1902 gc_stat->gc_index = stat->gc_index(); 1903 gc_stat->start_time = Management::ticks_to_ms(stat->start_time()); 1904 gc_stat->end_time = Management::ticks_to_ms(stat->end_time()); 1905 1906 // Current implementation does not have GC extension attributes 1907 gc_stat->num_gc_ext_attributes = 0; 1908 1909 // Fill the arrays of MemoryUsage objects with before and after GC 1910 // per pool memory usage 1911 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc, 1912 num_pools, 1913 CHECK); 1914 objArrayHandle usage_before_gc_ah(THREAD, bu); 1915 1916 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc, 1917 num_pools, 1918 CHECK); 1919 objArrayHandle usage_after_gc_ah(THREAD, au); 1920 1921 for (int i = 0; i < num_pools; i++) { 1922 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat->before_gc_usage_for_pool(i), CHECK); 1923 Handle after_usage; 1924 1925 MemoryUsage u = stat->after_gc_usage_for_pool(i); 1926 if (u.max_size() == 0 && u.used() > 0) { 1927 // If max size == 0, this pool is a survivor space. 1928 // Set max size = -1 since the pools will be swapped after GC. 1929 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1); 1930 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK); 1931 } else { 1932 after_usage = MemoryService::create_MemoryUsage_obj(stat->after_gc_usage_for_pool(i), CHECK); 1933 } 1934 usage_before_gc_ah->obj_at_put(i, before_usage()); 1935 usage_after_gc_ah->obj_at_put(i, after_usage()); 1936 } 1937 1938 if (gc_stat->gc_ext_attribute_values_size > 0) { 1939 // Current implementation only has 1 attribute (number of GC threads) 1940 // The type is 'I' 1941 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads(); 1942 } 1943JVM_END 1944 1945// Dump heap - Returns 0 if succeeds. 1946JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live)) 1947#ifndef SERVICES_KERNEL 1948 ResourceMark rm(THREAD); 1949 oop on = JNIHandles::resolve_external_guard(outputfile); 1950 if (on == NULL) { 1951 THROW_MSG_(vmSymbols::java_lang_NullPointerException(), 1952 "Output file name cannot be null.", -1); 1953 } 1954 char* name = java_lang_String::as_utf8_string(on); 1955 if (name == NULL) { 1956 THROW_MSG_(vmSymbols::java_lang_NullPointerException(), 1957 "Output file name cannot be null.", -1); 1958 } 1959 HeapDumper dumper(live ? true : false); 1960 if (dumper.dump(name) != 0) { 1961 const char* errmsg = dumper.error_as_C_string(); 1962 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1); 1963 } 1964 return 0; 1965#else // SERVICES_KERNEL 1966 return -1; 1967#endif // SERVICES_KERNEL 1968JVM_END 1969 1970jlong Management::ticks_to_ms(jlong ticks) { 1971 assert(os::elapsed_frequency() > 0, "Must be non-zero"); 1972 return (jlong)(((double)ticks / (double)os::elapsed_frequency()) 1973 * (double)1000.0); 1974} 1975 1976const struct jmmInterface_1_ jmm_interface = { 1977 NULL, 1978 NULL, 1979 jmm_GetVersion, 1980 jmm_GetOptionalSupport, 1981 jmm_GetInputArguments, 1982 jmm_GetThreadInfo, 1983 jmm_GetInputArgumentArray, 1984 jmm_GetMemoryPools, 1985 jmm_GetMemoryManagers, 1986 jmm_GetMemoryPoolUsage, 1987 jmm_GetPeakMemoryPoolUsage, 1988 NULL, 1989 jmm_GetMemoryUsage, 1990 jmm_GetLongAttribute, 1991 jmm_GetBoolAttribute, 1992 jmm_SetBoolAttribute, 1993 jmm_GetLongAttributes, 1994 jmm_FindMonitorDeadlockedThreads, 1995 jmm_GetThreadCpuTime, 1996 jmm_GetVMGlobalNames, 1997 jmm_GetVMGlobals, 1998 jmm_GetInternalThreadTimes, 1999 jmm_ResetStatistic, 2000 jmm_SetPoolSensor, 2001 jmm_SetPoolThreshold, 2002 jmm_GetPoolCollectionUsage, 2003 jmm_GetGCExtAttributeInfo, 2004 jmm_GetLastGCStat, 2005 jmm_GetThreadCpuTimeWithKind, 2006 NULL, 2007 jmm_DumpHeap0, 2008 jmm_FindDeadlockedThreads, 2009 jmm_SetVMGlobal, 2010 NULL, 2011 jmm_DumpThreads 2012}; 2013 2014void* Management::get_jmm_interface(int version) { 2015 if (version == JMM_VERSION_1_0) { 2016 return (void*) &jmm_interface; 2017 } 2018 return NULL; 2019} 2020