1 /* 2 * Copyright (c) 2003, 2009, 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 "incls/_precompiled.incl" 26 # include "incls/_management.cpp.incl" 27 28 PerfVariable* Management::_begin_vm_creation_time = NULL; 29 PerfVariable* Management::_end_vm_creation_time = NULL; 30 PerfVariable* Management::_vm_init_done_time = NULL; 31 32 klassOop Management::_sensor_klass = NULL; 33 klassOop Management::_threadInfo_klass = NULL; 34 klassOop Management::_memoryUsage_klass = NULL; 35 klassOop Management::_memoryPoolMXBean_klass = NULL; 36 klassOop Management::_memoryManagerMXBean_klass = NULL; 37 klassOop Management::_garbageCollectorMXBean_klass = NULL; 38 klassOop Management::_managementFactory_klass = NULL; 39 40 jmmOptionalSupport Management::_optional_support = {0}; 41 TimeStamp Management::_stamp; 42 43 void management_init() { 44 Management::init(); 45 ThreadService::init(); 46 RuntimeService::init(); 47 ClassLoadingService::init(); 48 } 49 50 void 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 89 void 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 } 115 116 void Management::get_optional_support(jmmOptionalSupport* support) { 117 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport)); 118 } 119 120 klassOop 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 } 128 129 void 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 } 138 139 jlong Management::timestamp() { 140 TimeStamp t; 141 t.update(); 142 return t.ticks() - _stamp.ticks(); 143 } 144 145 void 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 } 157 158 klassOop 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 } 164 165 klassOop 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 } 171 172 klassOop 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 } 178 179 klassOop 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 } 185 186 klassOop 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 } 192 193 klassOop 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 } 199 200 klassOop 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 } 206 207 static 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 250 instanceOop 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 } 275 276 instanceOop 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 312 static 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 } 328 329 static 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 } 351 352 static 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 } 363 364 static 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 } 384 385 static 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 } 396 397 398 static 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. 412 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env)) 413 return JMM_VERSION; 414 JVM_END 415 416 // Gets the list of VM monitoring and management optional supports 417 // Returns 0 if succeeded; otherwise returns non-zero. 418 JVM_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; 424 JVM_END 425 426 // Returns a java.lang.String object containing the input arguments to the VM. 427 JVM_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()); 479 JVM_END 480 481 // Returns an array of java.lang.String object containing the input arguments to the VM. 482 JVM_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()); 508 JVM_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. 514 JVM_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()); 553 JVM_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. 559 JVM_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()); 598 JVM_END 599 600 601 // Returns a java/lang/management/MemoryUsage object containing the memory usage 602 // of a given memory pool. 603 JVM_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 } 614 JVM_END 615 616 // Returns a java/lang/management/MemoryUsage object containing the memory usage 617 // of a given memory pool. 618 JVM_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 } 629 JVM_END 630 631 // Returns a java/lang/management/MemoryUsage object containing the memory usage 632 // of a given memory pool after most recent GC. 633 JVM_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 } 644 JVM_END 645 646 // Sets the memory pool sensor for a threshold type 647 JVM_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 } 678 679 JVM_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 // 690 JVM_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 ((size_t)threshold > max_uintx) { 698 stringStream st; 699 st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx); 700 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -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; 748 JVM_END 749 750 // Returns a java/lang/management/MemoryUsage object representing 751 // the memory usage for the heap or non-heap memory. 752 JVM_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, we make sure that all non-heap 789 // pools have defined init and max sizes. Heap pools do not matter, 790 // as we never use total_init and total_max for them. 791 assert(heap || !has_undefined_init_size, "Undefined init size"); 792 assert(heap || !has_undefined_max_size, "Undefined max size"); 793 794 MemoryUsage usage((heap ? InitialHeapSize : total_init), 795 total_used, 796 total_committed, 797 (heap ? Universe::heap()->max_capacity() : total_max)); 798 799 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); 800 return JNIHandles::make_local(env, obj()); 801 JVM_END 802 803 // Returns the boolean value of a given attribute. 804 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att)) 805 switch (att) { 806 case JMM_VERBOSE_GC: 807 return MemoryService::get_verbose(); 808 case JMM_VERBOSE_CLASS: 809 return ClassLoadingService::get_verbose(); 810 case JMM_THREAD_CONTENTION_MONITORING: 811 return ThreadService::is_thread_monitoring_contention(); 812 case JMM_THREAD_CPU_TIME: 813 return ThreadService::is_thread_cpu_time_enabled(); 814 default: 815 assert(0, "Unrecognized attribute"); 816 return false; 817 } 818 JVM_END 819 820 // Sets the given boolean attribute and returns the previous value. 821 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag)) 822 switch (att) { 823 case JMM_VERBOSE_GC: 824 return MemoryService::set_verbose(flag != 0); 825 case JMM_VERBOSE_CLASS: 826 return ClassLoadingService::set_verbose(flag != 0); 827 case JMM_THREAD_CONTENTION_MONITORING: 828 return ThreadService::set_thread_monitoring_contention(flag != 0); 829 case JMM_THREAD_CPU_TIME: 830 return ThreadService::set_thread_cpu_time_enabled(flag != 0); 831 default: 832 assert(0, "Unrecognized attribute"); 833 return false; 834 } 835 JVM_END 836 837 838 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) { 839 switch (att) { 840 case JMM_GC_TIME_MS: 841 return mgr->gc_time_ms(); 842 843 case JMM_GC_COUNT: 844 return mgr->gc_count(); 845 846 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE: 847 // current implementation only has 1 ext attribute 848 return 1; 849 850 default: 851 assert(0, "Unrecognized GC attribute"); 852 return -1; 853 } 854 } 855 856 class VmThreadCountClosure: public ThreadClosure { 857 private: 858 int _count; 859 public: 860 VmThreadCountClosure() : _count(0) {}; 861 void do_thread(Thread* thread); 862 int count() { return _count; } 863 }; 864 865 void VmThreadCountClosure::do_thread(Thread* thread) { 866 // exclude externally visible JavaThreads 867 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) { 868 return; 869 } 870 871 _count++; 872 } 873 874 static jint get_vm_thread_count() { 875 VmThreadCountClosure vmtcc; 876 { 877 MutexLockerEx ml(Threads_lock); 878 Threads::threads_do(&vmtcc); 879 } 880 881 return vmtcc.count(); 882 } 883 884 static jint get_num_flags() { 885 // last flag entry is always NULL, so subtract 1 886 int nFlags = (int) Flag::numFlags - 1; 887 int count = 0; 888 for (int i = 0; i < nFlags; i++) { 889 Flag* flag = &Flag::flags[i]; 890 // Exclude the locked (diagnostic, experimental) flags 891 if (flag->is_unlocked() || flag->is_unlocker()) { 892 count++; 893 } 894 } 895 return count; 896 } 897 898 static jlong get_long_attribute(jmmLongAttribute att) { 899 switch (att) { 900 case JMM_CLASS_LOADED_COUNT: 901 return ClassLoadingService::loaded_class_count(); 902 903 case JMM_CLASS_UNLOADED_COUNT: 904 return ClassLoadingService::unloaded_class_count(); 905 906 case JMM_THREAD_TOTAL_COUNT: 907 return ThreadService::get_total_thread_count(); 908 909 case JMM_THREAD_LIVE_COUNT: 910 return ThreadService::get_live_thread_count(); 911 912 case JMM_THREAD_PEAK_COUNT: 913 return ThreadService::get_peak_thread_count(); 914 915 case JMM_THREAD_DAEMON_COUNT: 916 return ThreadService::get_daemon_thread_count(); 917 918 case JMM_JVM_INIT_DONE_TIME_MS: 919 return Management::vm_init_done_time(); 920 921 case JMM_COMPILE_TOTAL_TIME_MS: 922 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks()); 923 924 case JMM_OS_PROCESS_ID: 925 return os::current_process_id(); 926 927 // Hotspot-specific counters 928 case JMM_CLASS_LOADED_BYTES: 929 return ClassLoadingService::loaded_class_bytes(); 930 931 case JMM_CLASS_UNLOADED_BYTES: 932 return ClassLoadingService::unloaded_class_bytes(); 933 934 case JMM_SHARED_CLASS_LOADED_COUNT: 935 return ClassLoadingService::loaded_shared_class_count(); 936 937 case JMM_SHARED_CLASS_UNLOADED_COUNT: 938 return ClassLoadingService::unloaded_shared_class_count(); 939 940 941 case JMM_SHARED_CLASS_LOADED_BYTES: 942 return ClassLoadingService::loaded_shared_class_bytes(); 943 944 case JMM_SHARED_CLASS_UNLOADED_BYTES: 945 return ClassLoadingService::unloaded_shared_class_bytes(); 946 947 case JMM_TOTAL_CLASSLOAD_TIME_MS: 948 return ClassLoader::classloader_time_ms(); 949 950 case JMM_VM_GLOBAL_COUNT: 951 return get_num_flags(); 952 953 case JMM_SAFEPOINT_COUNT: 954 return RuntimeService::safepoint_count(); 955 956 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS: 957 return RuntimeService::safepoint_sync_time_ms(); 958 959 case JMM_TOTAL_STOPPED_TIME_MS: 960 return RuntimeService::safepoint_time_ms(); 961 962 case JMM_TOTAL_APP_TIME_MS: 963 return RuntimeService::application_time_ms(); 964 965 case JMM_VM_THREAD_COUNT: 966 return get_vm_thread_count(); 967 968 case JMM_CLASS_INIT_TOTAL_COUNT: 969 return ClassLoader::class_init_count(); 970 971 case JMM_CLASS_INIT_TOTAL_TIME_MS: 972 return ClassLoader::class_init_time_ms(); 973 974 case JMM_CLASS_VERIFY_TOTAL_TIME_MS: 975 return ClassLoader::class_verify_time_ms(); 976 977 case JMM_METHOD_DATA_SIZE_BYTES: 978 return ClassLoadingService::class_method_data_size(); 979 980 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES: 981 return os::physical_memory(); 982 983 default: 984 return -1; 985 } 986 } 987 988 989 // Returns the long value of a given attribute. 990 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att)) 991 if (obj == NULL) { 992 return get_long_attribute(att); 993 } else { 994 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L)); 995 if (mgr != NULL) { 996 return get_gc_attribute(mgr, att); 997 } 998 } 999 return -1; 1000 JVM_END 1001 1002 // Gets the value of all attributes specified in the given array 1003 // and sets the value in the result array. 1004 // Returns the number of attributes found. 1005 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env, 1006 jobject obj, 1007 jmmLongAttribute* atts, 1008 jint count, 1009 jlong* result)) 1010 1011 int num_atts = 0; 1012 if (obj == NULL) { 1013 for (int i = 0; i < count; i++) { 1014 result[i] = get_long_attribute(atts[i]); 1015 if (result[i] != -1) { 1016 num_atts++; 1017 } 1018 } 1019 } else { 1020 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0); 1021 for (int i = 0; i < count; i++) { 1022 result[i] = get_gc_attribute(mgr, atts[i]); 1023 if (result[i] != -1) { 1024 num_atts++; 1025 } 1026 } 1027 } 1028 return num_atts; 1029 JVM_END 1030 1031 // Helper function to do thread dump for a specific list of threads 1032 static void do_thread_dump(ThreadDumpResult* dump_result, 1033 typeArrayHandle ids_ah, // array of thread ID (long[]) 1034 int num_threads, 1035 int max_depth, 1036 bool with_locked_monitors, 1037 bool with_locked_synchronizers, 1038 TRAPS) { 1039 1040 // First get an array of threadObj handles. 1041 // A JavaThread may terminate before we get the stack trace. 1042 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads); 1043 { 1044 MutexLockerEx ml(Threads_lock); 1045 for (int i = 0; i < num_threads; i++) { 1046 jlong tid = ids_ah->long_at(i); 1047 JavaThread* jt = find_java_thread_from_id(tid); 1048 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL); 1049 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj); 1050 thread_handle_array->append(threadObj_h); 1051 } 1052 } 1053 1054 // Obtain thread dumps and thread snapshot information 1055 VM_ThreadDump op(dump_result, 1056 thread_handle_array, 1057 num_threads, 1058 max_depth, /* stack depth */ 1059 with_locked_monitors, 1060 with_locked_synchronizers); 1061 VMThread::execute(&op); 1062 } 1063 1064 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo 1065 // for the thread ID specified in the corresponding entry in 1066 // the given array of thread IDs; or NULL if the thread does not exist 1067 // or has terminated. 1068 // 1069 // Input parameters: 1070 // ids - array of thread IDs 1071 // maxDepth - the maximum depth of stack traces to be dumped: 1072 // maxDepth == -1 requests to dump entire stack trace. 1073 // maxDepth == 0 requests no stack trace. 1074 // infoArray - array of ThreadInfo objects 1075 // 1076 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray)) 1077 // Check if threads is null 1078 if (ids == NULL || infoArray == NULL) { 1079 THROW_(vmSymbols::java_lang_NullPointerException(), -1); 1080 } 1081 1082 if (maxDepth < -1) { 1083 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1084 "Invalid maxDepth", -1); 1085 } 1086 1087 ResourceMark rm(THREAD); 1088 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids)); 1089 typeArrayHandle ids_ah(THREAD, ta); 1090 1091 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray); 1092 objArrayOop oa = objArrayOop(infoArray_obj); 1093 objArrayHandle infoArray_h(THREAD, oa); 1094 1095 // validate the thread id array 1096 validate_thread_id_array(ids_ah, CHECK_0); 1097 1098 // validate the ThreadInfo[] parameters 1099 validate_thread_info_array(infoArray_h, CHECK_0); 1100 1101 // infoArray must be of the same length as the given array of thread IDs 1102 int num_threads = ids_ah->length(); 1103 if (num_threads != infoArray_h->length()) { 1104 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1105 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1); 1106 } 1107 1108 if (JDK_Version::is_gte_jdk16x_version()) { 1109 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots 1110 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0); 1111 } 1112 1113 // Must use ThreadDumpResult to store the ThreadSnapshot. 1114 // GC may occur after the thread snapshots are taken but before 1115 // this function returns. The threadObj and other oops kept 1116 // in the ThreadSnapshot are marked and adjusted during GC. 1117 ThreadDumpResult dump_result(num_threads); 1118 1119 if (maxDepth == 0) { 1120 // no stack trace dumped - do not need to stop the world 1121 { 1122 MutexLockerEx ml(Threads_lock); 1123 for (int i = 0; i < num_threads; i++) { 1124 jlong tid = ids_ah->long_at(i); 1125 JavaThread* jt = find_java_thread_from_id(tid); 1126 ThreadSnapshot* ts; 1127 if (jt == NULL) { 1128 // if the thread does not exist or now it is terminated, 1129 // create dummy snapshot 1130 ts = new ThreadSnapshot(); 1131 } else { 1132 ts = new ThreadSnapshot(jt); 1133 } 1134 dump_result.add_thread_snapshot(ts); 1135 } 1136 } 1137 } else { 1138 // obtain thread dump with the specific list of threads with stack trace 1139 1140 do_thread_dump(&dump_result, 1141 ids_ah, 1142 num_threads, 1143 maxDepth, 1144 false, /* no locked monitor */ 1145 false, /* no locked synchronizers */ 1146 CHECK_0); 1147 } 1148 1149 int num_snapshots = dump_result.num_snapshots(); 1150 assert(num_snapshots == num_threads, "Must match the number of thread snapshots"); 1151 int index = 0; 1152 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) { 1153 // For each thread, create an java/lang/management/ThreadInfo object 1154 // and fill with the thread information 1155 1156 if (ts->threadObj() == NULL) { 1157 // if the thread does not exist or now it is terminated, set threadinfo to NULL 1158 infoArray_h->obj_at_put(index, NULL); 1159 continue; 1160 } 1161 1162 // Create java.lang.management.ThreadInfo object 1163 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0); 1164 infoArray_h->obj_at_put(index, info_obj); 1165 } 1166 return 0; 1167 JVM_END 1168 1169 // Dump thread info for the specified threads. 1170 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo 1171 // for the thread ID specified in the corresponding entry in 1172 // the given array of thread IDs; or NULL if the thread does not exist 1173 // or has terminated. 1174 // 1175 // Input parameter: 1176 // ids - array of thread IDs; NULL indicates all live threads 1177 // locked_monitors - if true, dump locked object monitors 1178 // locked_synchronizers - if true, dump locked JSR-166 synchronizers 1179 // 1180 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers)) 1181 ResourceMark rm(THREAD); 1182 1183 if (JDK_Version::is_gte_jdk16x_version()) { 1184 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots 1185 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL); 1186 } 1187 1188 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids)); 1189 int num_threads = (ta != NULL ? ta->length() : 0); 1190 typeArrayHandle ids_ah(THREAD, ta); 1191 1192 ThreadDumpResult dump_result(num_threads); // can safepoint 1193 1194 if (ids_ah() != NULL) { 1195 1196 // validate the thread id array 1197 validate_thread_id_array(ids_ah, CHECK_NULL); 1198 1199 // obtain thread dump of a specific list of threads 1200 do_thread_dump(&dump_result, 1201 ids_ah, 1202 num_threads, 1203 -1, /* entire stack */ 1204 (locked_monitors ? true : false), /* with locked monitors */ 1205 (locked_synchronizers ? true : false), /* with locked synchronizers */ 1206 CHECK_NULL); 1207 } else { 1208 // obtain thread dump of all threads 1209 VM_ThreadDump op(&dump_result, 1210 -1, /* entire stack */ 1211 (locked_monitors ? true : false), /* with locked monitors */ 1212 (locked_synchronizers ? true : false) /* with locked synchronizers */); 1213 VMThread::execute(&op); 1214 } 1215 1216 int num_snapshots = dump_result.num_snapshots(); 1217 1218 // create the result ThreadInfo[] object 1219 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL); 1220 instanceKlassHandle ik (THREAD, k); 1221 objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL); 1222 objArrayHandle result_h(THREAD, r); 1223 1224 int index = 0; 1225 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) { 1226 if (ts->threadObj() == NULL) { 1227 // if the thread does not exist or now it is terminated, set threadinfo to NULL 1228 result_h->obj_at_put(index, NULL); 1229 continue; 1230 } 1231 1232 1233 1234 ThreadStackTrace* stacktrace = ts->get_stack_trace(); 1235 assert(stacktrace != NULL, "Must have a stack trace dumped"); 1236 1237 // Create Object[] filled with locked monitors 1238 // Create int[] filled with the stack depth where a monitor was locked 1239 int num_frames = stacktrace->get_stack_depth(); 1240 int num_locked_monitors = stacktrace->num_jni_locked_monitors(); 1241 1242 // Count the total number of locked monitors 1243 for (int i = 0; i < num_frames; i++) { 1244 StackFrameInfo* frame = stacktrace->stack_frame_at(i); 1245 num_locked_monitors += frame->num_locked_monitors(); 1246 } 1247 1248 objArrayHandle monitors_array; 1249 typeArrayHandle depths_array; 1250 objArrayHandle synchronizers_array; 1251 1252 if (locked_monitors) { 1253 // Constructs Object[] and int[] to contain the object monitor and the stack depth 1254 // where the thread locked it 1255 objArrayOop array = oopFactory::new_system_objArray(num_locked_monitors, CHECK_NULL); 1256 objArrayHandle mh(THREAD, array); 1257 monitors_array = mh; 1258 1259 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL); 1260 typeArrayHandle dh(THREAD, tarray); 1261 depths_array = dh; 1262 1263 int count = 0; 1264 int j = 0; 1265 for (int depth = 0; depth < num_frames; depth++) { 1266 StackFrameInfo* frame = stacktrace->stack_frame_at(depth); 1267 int len = frame->num_locked_monitors(); 1268 GrowableArray<oop>* locked_monitors = frame->locked_monitors(); 1269 for (j = 0; j < len; j++) { 1270 oop monitor = locked_monitors->at(j); 1271 assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); 1272 monitors_array->obj_at_put(count, monitor); 1273 depths_array->int_at_put(count, depth); 1274 count++; 1275 } 1276 } 1277 1278 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors(); 1279 for (j = 0; j < jni_locked_monitors->length(); j++) { 1280 oop object = jni_locked_monitors->at(j); 1281 assert(object != NULL && object->is_instance(), "must be a Java object"); 1282 monitors_array->obj_at_put(count, object); 1283 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info 1284 depths_array->int_at_put(count, -1); 1285 count++; 1286 } 1287 assert(count == num_locked_monitors, "number of locked monitors doesn't match"); 1288 } 1289 1290 if (locked_synchronizers) { 1291 // Create Object[] filled with locked JSR-166 synchronizers 1292 assert(ts->threadObj() != NULL, "Must be a valid JavaThread"); 1293 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks(); 1294 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL); 1295 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0); 1296 1297 objArrayOop array = oopFactory::new_system_objArray(num_locked_synchronizers, CHECK_NULL); 1298 objArrayHandle sh(THREAD, array); 1299 synchronizers_array = sh; 1300 1301 for (int k = 0; k < num_locked_synchronizers; k++) { 1302 synchronizers_array->obj_at_put(k, locks->at(k)); 1303 } 1304 } 1305 1306 // Create java.lang.management.ThreadInfo object 1307 instanceOop info_obj = Management::create_thread_info_instance(ts, 1308 monitors_array, 1309 depths_array, 1310 synchronizers_array, 1311 CHECK_NULL); 1312 result_h->obj_at_put(index, info_obj); 1313 } 1314 1315 return (jobjectArray) JNIHandles::make_local(env, result_h()); 1316 JVM_END 1317 1318 // Returns an array of Class objects. 1319 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env)) 1320 ResourceMark rm(THREAD); 1321 1322 LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter 1323 1324 int num_classes = lce.num_loaded_classes(); 1325 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0); 1326 objArrayHandle classes_ah(THREAD, r); 1327 1328 for (int i = 0; i < num_classes; i++) { 1329 KlassHandle kh = lce.get_klass(i); 1330 oop mirror = Klass::cast(kh())->java_mirror(); 1331 classes_ah->obj_at_put(i, mirror); 1332 } 1333 1334 return (jobjectArray) JNIHandles::make_local(env, classes_ah()); 1335 JVM_END 1336 1337 // Reset statistic. Return true if the requested statistic is reset. 1338 // Otherwise, return false. 1339 // 1340 // Input parameters: 1341 // obj - specify which instance the statistic associated with to be reset 1342 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object. 1343 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID. 1344 // type - the type of statistic to be reset 1345 // 1346 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type)) 1347 ResourceMark rm(THREAD); 1348 1349 switch (type) { 1350 case JMM_STAT_PEAK_THREAD_COUNT: 1351 ThreadService::reset_peak_thread_count(); 1352 return true; 1353 1354 case JMM_STAT_THREAD_CONTENTION_COUNT: 1355 case JMM_STAT_THREAD_CONTENTION_TIME: { 1356 jlong tid = obj.j; 1357 if (tid < 0) { 1358 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE); 1359 } 1360 1361 // Look for the JavaThread of this given tid 1362 MutexLockerEx ml(Threads_lock); 1363 if (tid == 0) { 1364 // reset contention statistics for all threads if tid == 0 1365 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) { 1366 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) { 1367 ThreadService::reset_contention_count_stat(java_thread); 1368 } else { 1369 ThreadService::reset_contention_time_stat(java_thread); 1370 } 1371 } 1372 } else { 1373 // reset contention statistics for a given thread 1374 JavaThread* java_thread = find_java_thread_from_id(tid); 1375 if (java_thread == NULL) { 1376 return false; 1377 } 1378 1379 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) { 1380 ThreadService::reset_contention_count_stat(java_thread); 1381 } else { 1382 ThreadService::reset_contention_time_stat(java_thread); 1383 } 1384 } 1385 return true; 1386 break; 1387 } 1388 case JMM_STAT_PEAK_POOL_USAGE: { 1389 jobject o = obj.l; 1390 if (o == NULL) { 1391 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1392 } 1393 1394 oop pool_obj = JNIHandles::resolve(o); 1395 assert(pool_obj->is_instance(), "Should be an instanceOop"); 1396 instanceHandle ph(THREAD, (instanceOop) pool_obj); 1397 1398 MemoryPool* pool = MemoryService::get_memory_pool(ph); 1399 if (pool != NULL) { 1400 pool->reset_peak_memory_usage(); 1401 return true; 1402 } 1403 break; 1404 } 1405 case JMM_STAT_GC_STAT: { 1406 jobject o = obj.l; 1407 if (o == NULL) { 1408 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1409 } 1410 1411 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0); 1412 if (mgr != NULL) { 1413 mgr->reset_gc_stat(); 1414 return true; 1415 } 1416 break; 1417 } 1418 default: 1419 assert(0, "Unknown Statistic Type"); 1420 } 1421 return false; 1422 JVM_END 1423 1424 // Returns the fast estimate of CPU time consumed by 1425 // a given thread (in nanoseconds). 1426 // If thread_id == 0, return CPU time for the current thread. 1427 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id)) 1428 if (!os::is_thread_cpu_time_supported()) { 1429 return -1; 1430 } 1431 1432 if (thread_id < 0) { 1433 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1434 "Invalid thread ID", -1); 1435 } 1436 1437 JavaThread* java_thread = NULL; 1438 if (thread_id == 0) { 1439 // current thread 1440 return os::current_thread_cpu_time(); 1441 } else { 1442 MutexLockerEx ml(Threads_lock); 1443 java_thread = find_java_thread_from_id(thread_id); 1444 if (java_thread != NULL) { 1445 return os::thread_cpu_time((Thread*) java_thread); 1446 } 1447 } 1448 return -1; 1449 JVM_END 1450 1451 // Returns the CPU time consumed by a given thread (in nanoseconds). 1452 // If thread_id == 0, CPU time for the current thread is returned. 1453 // If user_sys_cpu_time = true, user level and system CPU time of 1454 // a given thread is returned; otherwise, only user level CPU time 1455 // is returned. 1456 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time)) 1457 if (!os::is_thread_cpu_time_supported()) { 1458 return -1; 1459 } 1460 1461 if (thread_id < 0) { 1462 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1463 "Invalid thread ID", -1); 1464 } 1465 1466 JavaThread* java_thread = NULL; 1467 if (thread_id == 0) { 1468 // current thread 1469 return os::current_thread_cpu_time(user_sys_cpu_time != 0); 1470 } else { 1471 MutexLockerEx ml(Threads_lock); 1472 java_thread = find_java_thread_from_id(thread_id); 1473 if (java_thread != NULL) { 1474 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0); 1475 } 1476 } 1477 return -1; 1478 JVM_END 1479 1480 // Returns a String array of all VM global flag names 1481 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env)) 1482 // last flag entry is always NULL, so subtract 1 1483 int nFlags = (int) Flag::numFlags - 1; 1484 // allocate a temp array 1485 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1486 nFlags, CHECK_0); 1487 objArrayHandle flags_ah(THREAD, r); 1488 int num_entries = 0; 1489 for (int i = 0; i < nFlags; i++) { 1490 Flag* flag = &Flag::flags[i]; 1491 // Exclude the locked (experimental, diagnostic) flags 1492 if (flag->is_unlocked() || flag->is_unlocker()) { 1493 Handle s = java_lang_String::create_from_str(flag->name, CHECK_0); 1494 flags_ah->obj_at_put(num_entries, s()); 1495 num_entries++; 1496 } 1497 } 1498 1499 if (num_entries < nFlags) { 1500 // Return array of right length 1501 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0); 1502 for(int i = 0; i < num_entries; i++) { 1503 res->obj_at_put(i, flags_ah->obj_at(i)); 1504 } 1505 return (jobjectArray)JNIHandles::make_local(env, res); 1506 } 1507 1508 return (jobjectArray)JNIHandles::make_local(env, flags_ah()); 1509 JVM_END 1510 1511 // Utility function used by jmm_GetVMGlobals. Returns false if flag type 1512 // can't be determined, true otherwise. If false is returned, then *global 1513 // will be incomplete and invalid. 1514 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) { 1515 Handle flag_name; 1516 if (name() == NULL) { 1517 flag_name = java_lang_String::create_from_str(flag->name, CHECK_false); 1518 } else { 1519 flag_name = name; 1520 } 1521 global->name = (jstring)JNIHandles::make_local(env, flag_name()); 1522 1523 if (flag->is_bool()) { 1524 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE; 1525 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN; 1526 } else if (flag->is_intx()) { 1527 global->value.j = (jlong)flag->get_intx(); 1528 global->type = JMM_VMGLOBAL_TYPE_JLONG; 1529 } else if (flag->is_uintx()) { 1530 global->value.j = (jlong)flag->get_uintx(); 1531 global->type = JMM_VMGLOBAL_TYPE_JLONG; 1532 } else if (flag->is_uint64_t()) { 1533 global->value.j = (jlong)flag->get_uint64_t(); 1534 global->type = JMM_VMGLOBAL_TYPE_JLONG; 1535 } else if (flag->is_ccstr()) { 1536 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false); 1537 global->value.l = (jobject)JNIHandles::make_local(env, str()); 1538 global->type = JMM_VMGLOBAL_TYPE_JSTRING; 1539 } else { 1540 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN; 1541 return false; 1542 } 1543 1544 global->writeable = flag->is_writeable(); 1545 global->external = flag->is_external(); 1546 switch (flag->origin) { 1547 case DEFAULT: 1548 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT; 1549 break; 1550 case COMMAND_LINE: 1551 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE; 1552 break; 1553 case ENVIRON_VAR: 1554 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR; 1555 break; 1556 case CONFIG_FILE: 1557 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE; 1558 break; 1559 case MANAGEMENT: 1560 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT; 1561 break; 1562 case ERGONOMIC: 1563 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC; 1564 break; 1565 default: 1566 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER; 1567 } 1568 1569 return true; 1570 } 1571 1572 // Fill globals array of count length with jmmVMGlobal entries 1573 // specified by names. If names == NULL, fill globals array 1574 // with all Flags. Return value is number of entries 1575 // created in globals. 1576 // If a Flag with a given name in an array element does not 1577 // exist, globals[i].name will be set to NULL. 1578 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env, 1579 jobjectArray names, 1580 jmmVMGlobal *globals, 1581 jint count)) 1582 1583 1584 if (globals == NULL) { 1585 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1586 } 1587 1588 ResourceMark rm(THREAD); 1589 1590 if (names != NULL) { 1591 // return the requested globals 1592 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names)); 1593 objArrayHandle names_ah(THREAD, ta); 1594 // Make sure we have a String array 1595 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass(); 1596 if (element_klass != SystemDictionary::String_klass()) { 1597 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1598 "Array element type is not String class", 0); 1599 } 1600 1601 int names_length = names_ah->length(); 1602 int num_entries = 0; 1603 for (int i = 0; i < names_length && i < count; i++) { 1604 oop s = names_ah->obj_at(i); 1605 if (s == NULL) { 1606 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1607 } 1608 1609 Handle sh(THREAD, s); 1610 char* str = java_lang_String::as_utf8_string(s); 1611 Flag* flag = Flag::find_flag(str, strlen(str)); 1612 if (flag != NULL && 1613 add_global_entry(env, sh, &globals[i], flag, THREAD)) { 1614 num_entries++; 1615 } else { 1616 globals[i].name = NULL; 1617 } 1618 } 1619 return num_entries; 1620 } else { 1621 // return all globals if names == NULL 1622 1623 // last flag entry is always NULL, so subtract 1 1624 int nFlags = (int) Flag::numFlags - 1; 1625 Handle null_h; 1626 int num_entries = 0; 1627 for (int i = 0; i < nFlags && num_entries < count; i++) { 1628 Flag* flag = &Flag::flags[i]; 1629 // Exclude the locked (diagnostic, experimental) flags 1630 if ((flag->is_unlocked() || flag->is_unlocker()) && 1631 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) { 1632 num_entries++; 1633 } 1634 } 1635 return num_entries; 1636 } 1637 JVM_END 1638 1639 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value)) 1640 ResourceMark rm(THREAD); 1641 1642 oop fn = JNIHandles::resolve_external_guard(flag_name); 1643 if (fn == NULL) { 1644 THROW_MSG(vmSymbols::java_lang_NullPointerException(), 1645 "The flag name cannot be null."); 1646 } 1647 char* name = java_lang_String::as_utf8_string(fn); 1648 Flag* flag = Flag::find_flag(name, strlen(name)); 1649 if (flag == NULL) { 1650 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 1651 "Flag does not exist."); 1652 } 1653 if (!flag->is_writeable()) { 1654 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 1655 "This flag is not writeable."); 1656 } 1657 1658 bool succeed; 1659 if (flag->is_bool()) { 1660 bool bvalue = (new_value.z == JNI_TRUE ? true : false); 1661 succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT); 1662 } else if (flag->is_intx()) { 1663 intx ivalue = (intx)new_value.j; 1664 succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT); 1665 } else if (flag->is_uintx()) { 1666 uintx uvalue = (uintx)new_value.j; 1667 succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT); 1668 } else if (flag->is_uint64_t()) { 1669 uint64_t uvalue = (uint64_t)new_value.j; 1670 succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, MANAGEMENT); 1671 } else if (flag->is_ccstr()) { 1672 oop str = JNIHandles::resolve_external_guard(new_value.l); 1673 if (str == NULL) { 1674 THROW(vmSymbols::java_lang_NullPointerException()); 1675 } 1676 ccstr svalue = java_lang_String::as_utf8_string(str); 1677 succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT); 1678 } 1679 assert(succeed, "Setting flag should succeed"); 1680 JVM_END 1681 1682 class ThreadTimesClosure: public ThreadClosure { 1683 private: 1684 objArrayOop _names; 1685 typeArrayOop _times; 1686 int _names_len; 1687 int _times_len; 1688 int _count; 1689 1690 public: 1691 ThreadTimesClosure(objArrayOop names, typeArrayOop times); 1692 virtual void do_thread(Thread* thread); 1693 int count() { return _count; } 1694 }; 1695 1696 ThreadTimesClosure::ThreadTimesClosure(objArrayOop names, 1697 typeArrayOop times) { 1698 assert(names != NULL, "names was NULL"); 1699 assert(times != NULL, "times was NULL"); 1700 _names = names; 1701 _names_len = names->length(); 1702 _times = times; 1703 _times_len = times->length(); 1704 _count = 0; 1705 } 1706 1707 void ThreadTimesClosure::do_thread(Thread* thread) { 1708 Handle s; 1709 assert(thread != NULL, "thread was NULL"); 1710 1711 // exclude externally visible JavaThreads 1712 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) { 1713 return; 1714 } 1715 1716 if (_count >= _names_len || _count >= _times_len) { 1717 // skip if the result array is not big enough 1718 return; 1719 } 1720 1721 EXCEPTION_MARK; 1722 1723 assert(thread->name() != NULL, "All threads should have a name"); 1724 s = java_lang_String::create_from_str(thread->name(), CHECK); 1725 _names->obj_at_put(_count, s()); 1726 1727 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ? 1728 os::thread_cpu_time(thread) : -1); 1729 _count++; 1730 } 1731 1732 // Fills names with VM internal thread names and times with the corresponding 1733 // CPU times. If names or times is NULL, a NullPointerException is thrown. 1734 // If the element type of names is not String, an IllegalArgumentException is 1735 // thrown. 1736 // If an array is not large enough to hold all the entries, only the entries 1737 // that fit will be returned. Return value is the number of VM internal 1738 // threads entries. 1739 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env, 1740 jobjectArray names, 1741 jlongArray times)) 1742 if (names == NULL || times == NULL) { 1743 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1744 } 1745 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names)); 1746 objArrayHandle names_ah(THREAD, na); 1747 1748 // Make sure we have a String array 1749 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass(); 1750 if (element_klass != SystemDictionary::String_klass()) { 1751 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1752 "Array element type is not String class", 0); 1753 } 1754 1755 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times)); 1756 typeArrayHandle times_ah(THREAD, ta); 1757 1758 ThreadTimesClosure ttc(names_ah(), times_ah()); 1759 { 1760 MutexLockerEx ml(Threads_lock); 1761 Threads::threads_do(&ttc); 1762 } 1763 1764 return ttc.count(); 1765 JVM_END 1766 1767 static Handle find_deadlocks(bool object_monitors_only, TRAPS) { 1768 ResourceMark rm(THREAD); 1769 1770 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */); 1771 VMThread::execute(&op); 1772 1773 DeadlockCycle* deadlocks = op.result(); 1774 if (deadlocks == NULL) { 1775 // no deadlock found and return 1776 return Handle(); 1777 } 1778 1779 int num_threads = 0; 1780 DeadlockCycle* cycle; 1781 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) { 1782 num_threads += cycle->num_threads(); 1783 } 1784 1785 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH); 1786 objArrayHandle threads_ah(THREAD, r); 1787 1788 int index = 0; 1789 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) { 1790 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads(); 1791 int len = deadlock_threads->length(); 1792 for (int i = 0; i < len; i++) { 1793 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj()); 1794 index++; 1795 } 1796 } 1797 return threads_ah; 1798 } 1799 1800 // Finds cycles of threads that are deadlocked involved in object monitors 1801 // and JSR-166 synchronizers. 1802 // Returns an array of Thread objects which are in deadlock, if any. 1803 // Otherwise, returns NULL. 1804 // 1805 // Input parameter: 1806 // object_monitors_only - if true, only check object monitors 1807 // 1808 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only)) 1809 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0); 1810 return (jobjectArray) JNIHandles::make_local(env, result()); 1811 JVM_END 1812 1813 // Finds cycles of threads that are deadlocked on monitor locks 1814 // Returns an array of Thread objects which are in deadlock, if any. 1815 // Otherwise, returns NULL. 1816 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env)) 1817 Handle result = find_deadlocks(true, CHECK_0); 1818 return (jobjectArray) JNIHandles::make_local(env, result()); 1819 JVM_END 1820 1821 // Gets the information about GC extension attributes including 1822 // the name of the attribute, its type, and a short description. 1823 // 1824 // Input parameters: 1825 // mgr - GC memory manager 1826 // info - caller allocated array of jmmExtAttributeInfo 1827 // count - number of elements of the info array 1828 // 1829 // Returns the number of GC extension attributes filled in the info array; or 1830 // -1 if info is not big enough 1831 // 1832 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count)) 1833 // All GC memory managers have 1 attribute (number of GC threads) 1834 if (count == 0) { 1835 return 0; 1836 } 1837 1838 if (info == NULL) { 1839 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1840 } 1841 1842 info[0].name = "GcThreadCount"; 1843 info[0].type = 'I'; 1844 info[0].description = "Number of GC threads"; 1845 return 1; 1846 JVM_END 1847 1848 // verify the given array is an array of java/lang/management/MemoryUsage objects 1849 // of a given length and return the objArrayOop 1850 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) { 1851 if (array == NULL) { 1852 THROW_(vmSymbols::java_lang_NullPointerException(), 0); 1853 } 1854 1855 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array)); 1856 objArrayHandle array_h(THREAD, oa); 1857 1858 // array must be of the given length 1859 if (length != array_h->length()) { 1860 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1861 "The length of the given MemoryUsage array does not match the number of memory pools.", 0); 1862 } 1863 1864 // check if the element of array is of type MemoryUsage class 1865 klassOop usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0); 1866 klassOop element_klass = objArrayKlass::cast(array_h->klass())->element_klass(); 1867 if (element_klass != usage_klass) { 1868 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 1869 "The element type is not MemoryUsage class", 0); 1870 } 1871 1872 return array_h(); 1873 } 1874 1875 // Gets the statistics of the last GC of a given GC memory manager. 1876 // Input parameters: 1877 // obj - GarbageCollectorMXBean object 1878 // gc_stat - caller allocated jmmGCStat where: 1879 // a. before_gc_usage - array of MemoryUsage objects 1880 // b. after_gc_usage - array of MemoryUsage objects 1881 // c. gc_ext_attributes_values_size is set to the 1882 // gc_ext_attribute_values array allocated 1883 // d. gc_ext_attribute_values is a caller allocated array of jvalue. 1884 // 1885 // On return, 1886 // gc_index == 0 indicates no GC statistics available 1887 // 1888 // before_gc_usage and after_gc_usage - filled with per memory pool 1889 // before and after GC usage in the same order as the memory pools 1890 // returned by GetMemoryPools for a given GC memory manager. 1891 // num_gc_ext_attributes indicates the number of elements in 1892 // the gc_ext_attribute_values array is filled; or 1893 // -1 if the gc_ext_attributes_values array is not big enough 1894 // 1895 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat)) 1896 ResourceMark rm(THREAD); 1897 1898 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) { 1899 THROW(vmSymbols::java_lang_NullPointerException()); 1900 } 1901 1902 // Get the GCMemoryManager 1903 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK); 1904 1905 // Make a copy of the last GC statistics 1906 // GC may occur while constructing the last GC information 1907 int num_pools = MemoryService::num_memory_pools(); 1908 GCStatInfo* stat = new GCStatInfo(num_pools); 1909 if (mgr->get_last_gc_stat(stat) == 0) { 1910 gc_stat->gc_index = 0; 1911 return; 1912 } 1913 1914 gc_stat->gc_index = stat->gc_index(); 1915 gc_stat->start_time = Management::ticks_to_ms(stat->start_time()); 1916 gc_stat->end_time = Management::ticks_to_ms(stat->end_time()); 1917 1918 // Current implementation does not have GC extension attributes 1919 gc_stat->num_gc_ext_attributes = 0; 1920 1921 // Fill the arrays of MemoryUsage objects with before and after GC 1922 // per pool memory usage 1923 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc, 1924 num_pools, 1925 CHECK); 1926 objArrayHandle usage_before_gc_ah(THREAD, bu); 1927 1928 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc, 1929 num_pools, 1930 CHECK); 1931 objArrayHandle usage_after_gc_ah(THREAD, au); 1932 1933 for (int i = 0; i < num_pools; i++) { 1934 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat->before_gc_usage_for_pool(i), CHECK); 1935 Handle after_usage; 1936 1937 MemoryUsage u = stat->after_gc_usage_for_pool(i); 1938 if (u.max_size() == 0 && u.used() > 0) { 1939 // If max size == 0, this pool is a survivor space. 1940 // Set max size = -1 since the pools will be swapped after GC. 1941 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1); 1942 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK); 1943 } else { 1944 after_usage = MemoryService::create_MemoryUsage_obj(stat->after_gc_usage_for_pool(i), CHECK); 1945 } 1946 usage_before_gc_ah->obj_at_put(i, before_usage()); 1947 usage_after_gc_ah->obj_at_put(i, after_usage()); 1948 } 1949 1950 if (gc_stat->gc_ext_attribute_values_size > 0) { 1951 // Current implementation only has 1 attribute (number of GC threads) 1952 // The type is 'I' 1953 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads(); 1954 } 1955 JVM_END 1956 1957 // Dump heap - Returns 0 if succeeds. 1958 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live)) 1959 #ifndef SERVICES_KERNEL 1960 ResourceMark rm(THREAD); 1961 oop on = JNIHandles::resolve_external_guard(outputfile); 1962 if (on == NULL) { 1963 THROW_MSG_(vmSymbols::java_lang_NullPointerException(), 1964 "Output file name cannot be null.", -1); 1965 } 1966 char* name = java_lang_String::as_utf8_string(on); 1967 if (name == NULL) { 1968 THROW_MSG_(vmSymbols::java_lang_NullPointerException(), 1969 "Output file name cannot be null.", -1); 1970 } 1971 HeapDumper dumper(live ? true : false); 1972 if (dumper.dump(name) != 0) { 1973 const char* errmsg = dumper.error_as_C_string(); 1974 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1); 1975 } 1976 return 0; 1977 #else // SERVICES_KERNEL 1978 return -1; 1979 #endif // SERVICES_KERNEL 1980 JVM_END 1981 1982 jlong Management::ticks_to_ms(jlong ticks) { 1983 assert(os::elapsed_frequency() > 0, "Must be non-zero"); 1984 return (jlong)(((double)ticks / (double)os::elapsed_frequency()) 1985 * (double)1000.0); 1986 } 1987 1988 const struct jmmInterface_1_ jmm_interface = { 1989 NULL, 1990 NULL, 1991 jmm_GetVersion, 1992 jmm_GetOptionalSupport, 1993 jmm_GetInputArguments, 1994 jmm_GetThreadInfo, 1995 jmm_GetInputArgumentArray, 1996 jmm_GetMemoryPools, 1997 jmm_GetMemoryManagers, 1998 jmm_GetMemoryPoolUsage, 1999 jmm_GetPeakMemoryPoolUsage, 2000 NULL, 2001 jmm_GetMemoryUsage, 2002 jmm_GetLongAttribute, 2003 jmm_GetBoolAttribute, 2004 jmm_SetBoolAttribute, 2005 jmm_GetLongAttributes, 2006 jmm_FindMonitorDeadlockedThreads, 2007 jmm_GetThreadCpuTime, 2008 jmm_GetVMGlobalNames, 2009 jmm_GetVMGlobals, 2010 jmm_GetInternalThreadTimes, 2011 jmm_ResetStatistic, 2012 jmm_SetPoolSensor, 2013 jmm_SetPoolThreshold, 2014 jmm_GetPoolCollectionUsage, 2015 jmm_GetGCExtAttributeInfo, 2016 jmm_GetLastGCStat, 2017 jmm_GetThreadCpuTimeWithKind, 2018 NULL, 2019 jmm_DumpHeap0, 2020 jmm_FindDeadlockedThreads, 2021 jmm_SetVMGlobal, 2022 NULL, 2023 jmm_DumpThreads 2024 }; 2025 2026 void* Management::get_jmm_interface(int version) { 2027 if (version == JMM_VERSION_1_0) { 2028 return (void*) &jmm_interface; 2029 } 2030 return NULL; 2031 }