/* * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ # include "incls/_precompiled.incl" # include "incls/_management.cpp.incl" PerfVariable* Management::_begin_vm_creation_time = NULL; PerfVariable* Management::_end_vm_creation_time = NULL; PerfVariable* Management::_vm_init_done_time = NULL; klassOop Management::_sensor_klass = NULL; klassOop Management::_threadInfo_klass = NULL; klassOop Management::_memoryUsage_klass = NULL; klassOop Management::_memoryPoolMXBean_klass = NULL; klassOop Management::_memoryManagerMXBean_klass = NULL; klassOop Management::_garbageCollectorMXBean_klass = NULL; klassOop Management::_managementFactory_klass = NULL; jmmOptionalSupport Management::_optional_support = {0}; TimeStamp Management::_stamp; void management_init() { Management::init(); ThreadService::init(); RuntimeService::init(); ClassLoadingService::init(); } void Management::init() { EXCEPTION_MARK; // These counters are for java.lang.management API support. // They are created even if -XX:-UsePerfData is set and in // that case, they will be allocated on C heap. _begin_vm_creation_time = PerfDataManager::create_variable(SUN_RT, "createVmBeginTime", PerfData::U_None, CHECK); _end_vm_creation_time = PerfDataManager::create_variable(SUN_RT, "createVmEndTime", PerfData::U_None, CHECK); _vm_init_done_time = PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime", PerfData::U_None, CHECK); // Initialize optional support _optional_support.isLowMemoryDetectionSupported = 1; _optional_support.isCompilationTimeMonitoringSupported = 1; _optional_support.isThreadContentionMonitoringSupported = 1; if (os::is_thread_cpu_time_supported()) { _optional_support.isCurrentThreadCpuTimeSupported = 1; _optional_support.isOtherThreadCpuTimeSupported = 1; } else { _optional_support.isCurrentThreadCpuTimeSupported = 0; _optional_support.isOtherThreadCpuTimeSupported = 0; } _optional_support.isBootClassPathSupported = 1; _optional_support.isObjectMonitorUsageSupported = 1; #ifndef SERVICES_KERNEL // This depends on the heap inspector _optional_support.isSynchronizerUsageSupported = 1; #endif // SERVICES_KERNEL } void Management::initialize(TRAPS) { // Start the low memory detector thread LowMemoryDetector::initialize(); if (ManagementServer) { ResourceMark rm(THREAD); HandleMark hm(THREAD); // Load and initialize the sun.management.Agent class // invoke startAgent method to start the management server Handle loader = Handle(THREAD, SystemDictionary::java_system_loader()); klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::sun_management_Agent(), loader, Handle(), true, CHECK); instanceKlassHandle ik (THREAD, k); JavaValue result(T_VOID); JavaCalls::call_static(&result, ik, vmSymbolHandles::startAgent_name(), vmSymbolHandles::void_method_signature(), CHECK); } } void Management::get_optional_support(jmmOptionalSupport* support) { memcpy(support, &_optional_support, sizeof(jmmOptionalSupport)); } klassOop Management::load_and_initialize_klass(symbolHandle sh, TRAPS) { klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL); instanceKlassHandle ik (THREAD, k); if (ik->should_be_initialized()) { ik->initialize(CHECK_NULL); } return ik(); } void Management::record_vm_startup_time(jlong begin, jlong duration) { // if the performance counter is not initialized, // then vm initialization failed; simply return. if (_begin_vm_creation_time == NULL) return; _begin_vm_creation_time->set_value(begin); _end_vm_creation_time->set_value(begin + duration); PerfMemory::set_accessible(true); } jlong Management::timestamp() { TimeStamp t; t.update(); return t.ticks() - _stamp.ticks(); } void Management::oops_do(OopClosure* f) { MemoryService::oops_do(f); ThreadService::oops_do(f); f->do_oop((oop*) &_sensor_klass); f->do_oop((oop*) &_threadInfo_klass); f->do_oop((oop*) &_memoryUsage_klass); f->do_oop((oop*) &_memoryPoolMXBean_klass); f->do_oop((oop*) &_memoryManagerMXBean_klass); f->do_oop((oop*) &_garbageCollectorMXBean_klass); f->do_oop((oop*) &_managementFactory_klass); } klassOop Management::java_lang_management_ThreadInfo_klass(TRAPS) { if (_threadInfo_klass == NULL) { _threadInfo_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_ThreadInfo(), CHECK_NULL); } return _threadInfo_klass; } klassOop Management::java_lang_management_MemoryUsage_klass(TRAPS) { if (_memoryUsage_klass == NULL) { _memoryUsage_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryUsage(), CHECK_NULL); } return _memoryUsage_klass; } klassOop Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) { if (_memoryPoolMXBean_klass == NULL) { _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryPoolMXBean(), CHECK_NULL); } return _memoryPoolMXBean_klass; } klassOop Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) { if (_memoryManagerMXBean_klass == NULL) { _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryManagerMXBean(), CHECK_NULL); } return _memoryManagerMXBean_klass; } klassOop Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) { if (_garbageCollectorMXBean_klass == NULL) { _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL); } return _garbageCollectorMXBean_klass; } klassOop Management::sun_management_Sensor_klass(TRAPS) { if (_sensor_klass == NULL) { _sensor_klass = load_and_initialize_klass(vmSymbolHandles::sun_management_Sensor(), CHECK_NULL); } return _sensor_klass; } klassOop Management::sun_management_ManagementFactory_klass(TRAPS) { if (_managementFactory_klass == NULL) { _managementFactory_klass = load_and_initialize_klass(vmSymbolHandles::sun_management_ManagementFactory(), CHECK_NULL); } return _managementFactory_klass; } static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) { Handle snapshot_thread(THREAD, snapshot->threadObj()); jlong contended_time; jlong waited_time; if (ThreadService::is_thread_monitoring_contention()) { contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks()); waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks()); } else { // set them to -1 if thread contention monitoring is disabled. contended_time = max_julong; waited_time = max_julong; } int thread_status = snapshot->thread_status(); assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object"); if (snapshot->is_ext_suspended()) { thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED; } if (snapshot->is_in_native()) { thread_status |= JMM_THREAD_STATE_FLAG_NATIVE; } ThreadStackTrace* st = snapshot->get_stack_trace(); Handle stacktrace_h; if (st != NULL) { stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK); } else { stacktrace_h = Handle(); } args->push_oop(snapshot_thread); args->push_int(thread_status); args->push_oop(Handle(THREAD, snapshot->blocker_object())); args->push_oop(Handle(THREAD, snapshot->blocker_object_owner())); args->push_long(snapshot->contended_enter_count()); args->push_long(contended_time); args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count()); args->push_long(waited_time); args->push_oop(stacktrace_h); } // Helper function to construct a ThreadInfo object instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) { klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL); instanceKlassHandle ik (THREAD, k); JavaValue result(T_VOID); JavaCallArguments args(14); // First allocate a ThreadObj object and // push the receiver as the first argument Handle element = ik->allocate_instance_handle(CHECK_NULL); args.push_oop(element); // initialize the arguments for the ThreadInfo constructor initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL); // Call ThreadInfo constructor with no locked monitors and synchronizers JavaCalls::call_special(&result, ik, vmSymbolHandles::object_initializer_name(), vmSymbolHandles::java_lang_management_ThreadInfo_constructor_signature(), &args, CHECK_NULL); return (instanceOop) element(); } instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, objArrayHandle monitors_array, typeArrayHandle depths_array, objArrayHandle synchronizers_array, TRAPS) { klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL); instanceKlassHandle ik (THREAD, k); JavaValue result(T_VOID); JavaCallArguments args(17); // First allocate a ThreadObj object and // push the receiver as the first argument Handle element = ik->allocate_instance_handle(CHECK_NULL); args.push_oop(element); // initialize the arguments for the ThreadInfo constructor initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL); // push the locked monitors and synchronizers in the arguments args.push_oop(monitors_array); args.push_oop(depths_array); args.push_oop(synchronizers_array); // Call ThreadInfo constructor with locked monitors and synchronizers JavaCalls::call_special(&result, ik, vmSymbolHandles::object_initializer_name(), vmSymbolHandles::java_lang_management_ThreadInfo_with_locks_constructor_signature(), &args, CHECK_NULL); return (instanceOop) element(); } // Helper functions static JavaThread* find_java_thread_from_id(jlong thread_id) { assert(Threads_lock->owned_by_self(), "Must hold Threads_lock"); JavaThread* java_thread = NULL; // Sequential search for now. Need to do better optimization later. for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) { oop tobj = thread->threadObj(); if (!thread->is_exiting() && tobj != NULL && thread_id == java_lang_Thread::thread_id(tobj)) { java_thread = thread; break; } } return java_thread; } static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) { if (mgr == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), NULL); } oop mgr_obj = JNIHandles::resolve(mgr); instanceHandle h(THREAD, (instanceOop) mgr_obj); klassOop k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL); if (!h->is_a(k)) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "the object is not an instance of java.lang.management.GarbageCollectorMXBean class", NULL); } MemoryManager* gc = MemoryService::get_memory_manager(h); if (gc == NULL || !gc->is_gc_memory_manager()) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "Invalid GC memory manager", NULL); } return (GCMemoryManager*) gc; } static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) { if (obj == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), NULL); } oop pool_obj = JNIHandles::resolve(obj); assert(pool_obj->is_instance(), "Should be an instanceOop"); instanceHandle ph(THREAD, (instanceOop) pool_obj); return MemoryService::get_memory_pool(ph); } static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) { int num_threads = ids_ah->length(); // should be non-empty array if (num_threads == 0) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Empty array of thread IDs"); } // Validate input thread IDs int i = 0; for (i = 0; i < num_threads; i++) { jlong tid = ids_ah->long_at(i); if (tid <= 0) { // throw exception if invalid thread id. THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Invalid thread ID entry"); } } } static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) { // check if the element of infoArray is of type ThreadInfo class klassOop threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK); klassOop element_klass = objArrayKlass::cast(infoArray_h->klass())->element_klass(); if (element_klass != threadinfo_klass) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "infoArray element type is not ThreadInfo class"); } } static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) { if (obj == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), NULL); } oop mgr_obj = JNIHandles::resolve(obj); assert(mgr_obj->is_instance(), "Should be an instanceOop"); instanceHandle mh(THREAD, (instanceOop) mgr_obj); return MemoryService::get_memory_manager(mh); } // Returns a version string and sets major and minor version if // the input parameters are non-null. JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env)) return JMM_VERSION; JVM_END // Gets the list of VM monitoring and management optional supports // Returns 0 if succeeded; otherwise returns non-zero. JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support)) if (support == NULL) { return -1; } Management::get_optional_support(support); return 0; JVM_END // Returns a java.lang.String object containing the input arguments to the VM. JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env)) ResourceMark rm(THREAD); if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { return NULL; } char** vm_flags = Arguments::jvm_flags_array(); char** vm_args = Arguments::jvm_args_array(); int num_flags = Arguments::num_jvm_flags(); int num_args = Arguments::num_jvm_args(); size_t length = 1; // null terminator int i; for (i = 0; i < num_flags; i++) { length += strlen(vm_flags[i]); } for (i = 0; i < num_args; i++) { length += strlen(vm_args[i]); } // add a space between each argument length += num_flags + num_args - 1; // Return the list of input arguments passed to the VM // and preserve the order that the VM processes. char* args = NEW_RESOURCE_ARRAY(char, length); args[0] = '\0'; // concatenate all jvm_flags if (num_flags > 0) { strcat(args, vm_flags[0]); for (i = 1; i < num_flags; i++) { strcat(args, " "); strcat(args, vm_flags[i]); } } if (num_args > 0 && num_flags > 0) { // append a space if args already contains one or more jvm_flags strcat(args, " "); } // concatenate all jvm_args if (num_args > 0) { strcat(args, vm_args[0]); for (i = 1; i < num_args; i++) { strcat(args, " "); strcat(args, vm_args[i]); } } Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL); return JNIHandles::make_local(env, hargs()); JVM_END // Returns an array of java.lang.String object containing the input arguments to the VM. JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env)) ResourceMark rm(THREAD); if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) { return NULL; } char** vm_flags = Arguments::jvm_flags_array(); char** vm_args = Arguments::jvm_args_array(); int num_flags = Arguments::num_jvm_flags(); int num_args = Arguments::num_jvm_args(); instanceKlassHandle ik (THREAD, SystemDictionary::string_klass()); objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL); objArrayHandle result_h(THREAD, r); int index = 0; for (int j = 0; j < num_flags; j++, index++) { Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL); result_h->obj_at_put(index, h()); } for (int i = 0; i < num_args; i++, index++) { Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL); result_h->obj_at_put(index, h()); } return (jobjectArray) JNIHandles::make_local(env, result_h()); JVM_END // Returns an array of java/lang/management/MemoryPoolMXBean object // one for each memory pool if obj == null; otherwise returns // an array of memory pools for a given memory manager if // it is a valid memory manager. JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj)) ResourceMark rm(THREAD); int num_memory_pools; MemoryManager* mgr = NULL; if (obj == NULL) { num_memory_pools = MemoryService::num_memory_pools(); } else { mgr = get_memory_manager_from_jobject(obj, CHECK_NULL); if (mgr == NULL) { return NULL; } num_memory_pools = mgr->num_memory_pools(); } // Allocate the resulting MemoryPoolMXBean[] object klassOop k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL); instanceKlassHandle ik (THREAD, k); objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL); objArrayHandle poolArray(THREAD, r); if (mgr == NULL) { // Get all memory pools for (int i = 0; i < num_memory_pools; i++) { MemoryPool* pool = MemoryService::get_memory_pool(i); instanceOop p = pool->get_memory_pool_instance(CHECK_NULL); instanceHandle ph(THREAD, p); poolArray->obj_at_put(i, ph()); } } else { // Get memory pools managed by a given memory manager for (int i = 0; i < num_memory_pools; i++) { MemoryPool* pool = mgr->get_memory_pool(i); instanceOop p = pool->get_memory_pool_instance(CHECK_NULL); instanceHandle ph(THREAD, p); poolArray->obj_at_put(i, ph()); } } return (jobjectArray) JNIHandles::make_local(env, poolArray()); JVM_END // Returns an array of java/lang/management/MemoryManagerMXBean object // one for each memory manager if obj == null; otherwise returns // an array of memory managers for a given memory pool if // it is a valid memory pool. JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj)) ResourceMark rm(THREAD); int num_mgrs; MemoryPool* pool = NULL; if (obj == NULL) { num_mgrs = MemoryService::num_memory_managers(); } else { pool = get_memory_pool_from_jobject(obj, CHECK_NULL); if (pool == NULL) { return NULL; } num_mgrs = pool->num_memory_managers(); } // Allocate the resulting MemoryManagerMXBean[] object klassOop k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL); instanceKlassHandle ik (THREAD, k); objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL); objArrayHandle mgrArray(THREAD, r); if (pool == NULL) { // Get all memory managers for (int i = 0; i < num_mgrs; i++) { MemoryManager* mgr = MemoryService::get_memory_manager(i); instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL); instanceHandle ph(THREAD, p); mgrArray->obj_at_put(i, ph()); } } else { // Get memory managers for a given memory pool for (int i = 0; i < num_mgrs; i++) { MemoryManager* mgr = pool->get_memory_manager(i); instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL); instanceHandle ph(THREAD, p); mgrArray->obj_at_put(i, ph()); } } return (jobjectArray) JNIHandles::make_local(env, mgrArray()); JVM_END // Returns a java/lang/management/MemoryUsage object containing the memory usage // of a given memory pool. JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj)) ResourceMark rm(THREAD); MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL); if (pool != NULL) { MemoryUsage usage = pool->get_memory_usage(); Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); return JNIHandles::make_local(env, h()); } else { return NULL; } JVM_END // Returns a java/lang/management/MemoryUsage object containing the memory usage // of a given memory pool. JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj)) ResourceMark rm(THREAD); MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL); if (pool != NULL) { MemoryUsage usage = pool->get_peak_memory_usage(); Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); return JNIHandles::make_local(env, h()); } else { return NULL; } JVM_END // Returns a java/lang/management/MemoryUsage object containing the memory usage // of a given memory pool after most recent GC. JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj)) ResourceMark rm(THREAD); MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL); if (pool != NULL && pool->is_collected_pool()) { MemoryUsage usage = pool->get_last_collection_usage(); Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); return JNIHandles::make_local(env, h()); } else { return NULL; } JVM_END // Sets the memory pool sensor for a threshold type JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj)) if (obj == NULL || sensorObj == NULL) { THROW(vmSymbols::java_lang_NullPointerException()); } klassOop sensor_klass = Management::sun_management_Sensor_klass(CHECK); oop s = JNIHandles::resolve(sensorObj); assert(s->is_instance(), "Sensor should be an instanceOop"); instanceHandle sensor_h(THREAD, (instanceOop) s); if (!sensor_h->is_a(sensor_klass)) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Sensor is not an instance of sun.management.Sensor class"); } MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK); assert(mpool != NULL, "MemoryPool should exist"); switch (type) { case JMM_USAGE_THRESHOLD_HIGH: case JMM_USAGE_THRESHOLD_LOW: // have only one sensor for threshold high and low mpool->set_usage_sensor_obj(sensor_h); break; case JMM_COLLECTION_USAGE_THRESHOLD_HIGH: case JMM_COLLECTION_USAGE_THRESHOLD_LOW: // have only one sensor for threshold high and low mpool->set_gc_usage_sensor_obj(sensor_h); break; default: assert(false, "Unrecognized type"); } JVM_END // Sets the threshold of a given memory pool. // Returns the previous threshold. // // Input parameters: // pool - the MemoryPoolMXBean object // type - threshold type // threshold - the new threshold (must not be negative) // JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold)) if (threshold < 0) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "Invalid threshold value", -1); } if ((size_t)threshold > max_uintx) { stringStream st; st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx); THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1); } MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L)); assert(pool != NULL, "MemoryPool should exist"); jlong prev = 0; switch (type) { case JMM_USAGE_THRESHOLD_HIGH: if (!pool->usage_threshold()->is_high_threshold_supported()) { return -1; } prev = pool->usage_threshold()->set_high_threshold((size_t) threshold); break; case JMM_USAGE_THRESHOLD_LOW: if (!pool->usage_threshold()->is_low_threshold_supported()) { return -1; } prev = pool->usage_threshold()->set_low_threshold((size_t) threshold); break; case JMM_COLLECTION_USAGE_THRESHOLD_HIGH: if (!pool->gc_usage_threshold()->is_high_threshold_supported()) { return -1; } // return and the new threshold is effective for the next GC return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold); case JMM_COLLECTION_USAGE_THRESHOLD_LOW: if (!pool->gc_usage_threshold()->is_low_threshold_supported()) { return -1; } // return and the new threshold is effective for the next GC return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold); default: assert(false, "Unrecognized type"); return -1; } // When the threshold is changed, reevaluate if the low memory // detection is enabled. if (prev != threshold) { LowMemoryDetector::recompute_enabled_for_collected_pools(); LowMemoryDetector::detect_low_memory(pool); } return prev; JVM_END // Returns a java/lang/management/MemoryUsage object representing // the memory usage for the heap or non-heap memory. JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap)) ResourceMark rm(THREAD); // Calculate the memory usage size_t total_init = 0; size_t total_used = 0; size_t total_committed = 0; size_t total_max = 0; bool has_undefined_init_size = false; bool has_undefined_max_size = false; for (int i = 0; i < MemoryService::num_memory_pools(); i++) { MemoryPool* pool = MemoryService::get_memory_pool(i); if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) { MemoryUsage u = pool->get_memory_usage(); total_used += u.used(); total_committed += u.committed(); // if any one of the memory pool has undefined init_size or max_size, // set it to -1 if (u.init_size() == (size_t)-1) { has_undefined_init_size = true; } if (!has_undefined_init_size) { total_init += u.init_size(); } if (u.max_size() == (size_t)-1) { has_undefined_max_size = true; } if (!has_undefined_max_size) { total_max += u.max_size(); } } } // In our current implementation, all pools should have // defined init and max size assert(!has_undefined_init_size, "Undefined init size"); assert(!has_undefined_max_size, "Undefined max size"); MemoryUsage usage((heap ? Arguments::initial_heap_size() : total_init), total_used, total_committed, (heap ? Universe::heap()->max_capacity() : total_max)); Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL); return JNIHandles::make_local(env, obj()); JVM_END // Returns the boolean value of a given attribute. JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att)) switch (att) { case JMM_VERBOSE_GC: return MemoryService::get_verbose(); case JMM_VERBOSE_CLASS: return ClassLoadingService::get_verbose(); case JMM_THREAD_CONTENTION_MONITORING: return ThreadService::is_thread_monitoring_contention(); case JMM_THREAD_CPU_TIME: return ThreadService::is_thread_cpu_time_enabled(); default: assert(0, "Unrecognized attribute"); return false; } JVM_END // Sets the given boolean attribute and returns the previous value. JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag)) switch (att) { case JMM_VERBOSE_GC: return MemoryService::set_verbose(flag != 0); case JMM_VERBOSE_CLASS: return ClassLoadingService::set_verbose(flag != 0); case JMM_THREAD_CONTENTION_MONITORING: return ThreadService::set_thread_monitoring_contention(flag != 0); case JMM_THREAD_CPU_TIME: return ThreadService::set_thread_cpu_time_enabled(flag != 0); default: assert(0, "Unrecognized attribute"); return false; } JVM_END static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) { switch (att) { case JMM_GC_TIME_MS: return mgr->gc_time_ms(); case JMM_GC_COUNT: return mgr->gc_count(); case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE: // current implementation only has 1 ext attribute return 1; default: assert(0, "Unrecognized GC attribute"); return -1; } } class VmThreadCountClosure: public ThreadClosure { private: int _count; public: VmThreadCountClosure() : _count(0) {}; void do_thread(Thread* thread); int count() { return _count; } }; void VmThreadCountClosure::do_thread(Thread* thread) { // exclude externally visible JavaThreads if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) { return; } _count++; } static jint get_vm_thread_count() { VmThreadCountClosure vmtcc; { MutexLockerEx ml(Threads_lock); Threads::threads_do(&vmtcc); } return vmtcc.count(); } static jint get_num_flags() { // last flag entry is always NULL, so subtract 1 int nFlags = (int) Flag::numFlags - 1; int count = 0; for (int i = 0; i < nFlags; i++) { Flag* flag = &Flag::flags[i]; // Exclude the locked (diagnostic, experimental) flags if (flag->is_unlocked() || flag->is_unlocker()) { count++; } } return count; } static jlong get_long_attribute(jmmLongAttribute att) { switch (att) { case JMM_CLASS_LOADED_COUNT: return ClassLoadingService::loaded_class_count(); case JMM_CLASS_UNLOADED_COUNT: return ClassLoadingService::unloaded_class_count(); case JMM_THREAD_TOTAL_COUNT: return ThreadService::get_total_thread_count(); case JMM_THREAD_LIVE_COUNT: return ThreadService::get_live_thread_count(); case JMM_THREAD_PEAK_COUNT: return ThreadService::get_peak_thread_count(); case JMM_THREAD_DAEMON_COUNT: return ThreadService::get_daemon_thread_count(); case JMM_JVM_INIT_DONE_TIME_MS: return Management::vm_init_done_time(); case JMM_COMPILE_TOTAL_TIME_MS: return Management::ticks_to_ms(CompileBroker::total_compilation_ticks()); case JMM_OS_PROCESS_ID: return os::current_process_id(); // Hotspot-specific counters case JMM_CLASS_LOADED_BYTES: return ClassLoadingService::loaded_class_bytes(); case JMM_CLASS_UNLOADED_BYTES: return ClassLoadingService::unloaded_class_bytes(); case JMM_SHARED_CLASS_LOADED_COUNT: return ClassLoadingService::loaded_shared_class_count(); case JMM_SHARED_CLASS_UNLOADED_COUNT: return ClassLoadingService::unloaded_shared_class_count(); case JMM_SHARED_CLASS_LOADED_BYTES: return ClassLoadingService::loaded_shared_class_bytes(); case JMM_SHARED_CLASS_UNLOADED_BYTES: return ClassLoadingService::unloaded_shared_class_bytes(); case JMM_TOTAL_CLASSLOAD_TIME_MS: return ClassLoader::classloader_time_ms(); case JMM_VM_GLOBAL_COUNT: return get_num_flags(); case JMM_SAFEPOINT_COUNT: return RuntimeService::safepoint_count(); case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS: return RuntimeService::safepoint_sync_time_ms(); case JMM_TOTAL_STOPPED_TIME_MS: return RuntimeService::safepoint_time_ms(); case JMM_TOTAL_APP_TIME_MS: return RuntimeService::application_time_ms(); case JMM_VM_THREAD_COUNT: return get_vm_thread_count(); case JMM_CLASS_INIT_TOTAL_COUNT: return ClassLoader::class_init_count(); case JMM_CLASS_INIT_TOTAL_TIME_MS: return ClassLoader::class_init_time_ms(); case JMM_CLASS_VERIFY_TOTAL_TIME_MS: return ClassLoader::class_verify_time_ms(); case JMM_METHOD_DATA_SIZE_BYTES: return ClassLoadingService::class_method_data_size(); case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES: return os::physical_memory(); default: return -1; } } // Returns the long value of a given attribute. JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att)) if (obj == NULL) { return get_long_attribute(att); } else { GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L)); if (mgr != NULL) { return get_gc_attribute(mgr, att); } } return -1; JVM_END // Gets the value of all attributes specified in the given array // and sets the value in the result array. // Returns the number of attributes found. JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env, jobject obj, jmmLongAttribute* atts, jint count, jlong* result)) int num_atts = 0; if (obj == NULL) { for (int i = 0; i < count; i++) { result[i] = get_long_attribute(atts[i]); if (result[i] != -1) { num_atts++; } } } else { GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0); for (int i = 0; i < count; i++) { result[i] = get_gc_attribute(mgr, atts[i]); if (result[i] != -1) { num_atts++; } } } return num_atts; JVM_END // Helper function to do thread dump for a specific list of threads static void do_thread_dump(ThreadDumpResult* dump_result, typeArrayHandle ids_ah, // array of thread ID (long[]) int num_threads, int max_depth, bool with_locked_monitors, bool with_locked_synchronizers, TRAPS) { // First get an array of threadObj handles. // A JavaThread may terminate before we get the stack trace. GrowableArray* thread_handle_array = new GrowableArray(num_threads); { MutexLockerEx ml(Threads_lock); for (int i = 0; i < num_threads; i++) { jlong tid = ids_ah->long_at(i); JavaThread* jt = find_java_thread_from_id(tid); oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL); instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj); thread_handle_array->append(threadObj_h); } } // Obtain thread dumps and thread snapshot information VM_ThreadDump op(dump_result, thread_handle_array, num_threads, max_depth, /* stack depth */ with_locked_monitors, with_locked_synchronizers); VMThread::execute(&op); } // Gets an array of ThreadInfo objects. Each element is the ThreadInfo // for the thread ID specified in the corresponding entry in // the given array of thread IDs; or NULL if the thread does not exist // or has terminated. // // Input parameters: // ids - array of thread IDs // maxDepth - the maximum depth of stack traces to be dumped: // maxDepth == -1 requests to dump entire stack trace. // maxDepth == 0 requests no stack trace. // infoArray - array of ThreadInfo objects // JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray)) // Check if threads is null if (ids == NULL || infoArray == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), -1); } if (maxDepth < -1) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "Invalid maxDepth", -1); } ResourceMark rm(THREAD); typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids)); typeArrayHandle ids_ah(THREAD, ta); oop infoArray_obj = JNIHandles::resolve_non_null(infoArray); objArrayOop oa = objArrayOop(infoArray_obj); objArrayHandle infoArray_h(THREAD, oa); // validate the thread id array validate_thread_id_array(ids_ah, CHECK_0); // validate the ThreadInfo[] parameters validate_thread_info_array(infoArray_h, CHECK_0); // infoArray must be of the same length as the given array of thread IDs int num_threads = ids_ah->length(); if (num_threads != infoArray_h->length()) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1); } if (JDK_Version::is_gte_jdk16x_version()) { // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0); } // Must use ThreadDumpResult to store the ThreadSnapshot. // GC may occur after the thread snapshots are taken but before // this function returns. The threadObj and other oops kept // in the ThreadSnapshot are marked and adjusted during GC. ThreadDumpResult dump_result(num_threads); if (maxDepth == 0) { // no stack trace dumped - do not need to stop the world { MutexLockerEx ml(Threads_lock); for (int i = 0; i < num_threads; i++) { jlong tid = ids_ah->long_at(i); JavaThread* jt = find_java_thread_from_id(tid); ThreadSnapshot* ts; if (jt == NULL) { // if the thread does not exist or now it is terminated, // create dummy snapshot ts = new ThreadSnapshot(); } else { ts = new ThreadSnapshot(jt); } dump_result.add_thread_snapshot(ts); } } } else { // obtain thread dump with the specific list of threads with stack trace do_thread_dump(&dump_result, ids_ah, num_threads, maxDepth, false, /* no locked monitor */ false, /* no locked synchronizers */ CHECK_0); } int num_snapshots = dump_result.num_snapshots(); assert(num_snapshots == num_threads, "Must match the number of thread snapshots"); int index = 0; for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) { // For each thread, create an java/lang/management/ThreadInfo object // and fill with the thread information if (ts->threadObj() == NULL) { // if the thread does not exist or now it is terminated, set threadinfo to NULL infoArray_h->obj_at_put(index, NULL); continue; } // Create java.lang.management.ThreadInfo object instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0); infoArray_h->obj_at_put(index, info_obj); } return 0; JVM_END // Dump thread info for the specified threads. // It returns an array of ThreadInfo objects. Each element is the ThreadInfo // for the thread ID specified in the corresponding entry in // the given array of thread IDs; or NULL if the thread does not exist // or has terminated. // // Input parameter: // ids - array of thread IDs; NULL indicates all live threads // locked_monitors - if true, dump locked object monitors // locked_synchronizers - if true, dump locked JSR-166 synchronizers // JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers)) ResourceMark rm(THREAD); if (JDK_Version::is_gte_jdk16x_version()) { // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL); } typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids)); int num_threads = (ta != NULL ? ta->length() : 0); typeArrayHandle ids_ah(THREAD, ta); ThreadDumpResult dump_result(num_threads); // can safepoint if (ids_ah() != NULL) { // validate the thread id array validate_thread_id_array(ids_ah, CHECK_NULL); // obtain thread dump of a specific list of threads do_thread_dump(&dump_result, ids_ah, num_threads, -1, /* entire stack */ (locked_monitors ? true : false), /* with locked monitors */ (locked_synchronizers ? true : false), /* with locked synchronizers */ CHECK_NULL); } else { // obtain thread dump of all threads VM_ThreadDump op(&dump_result, -1, /* entire stack */ (locked_monitors ? true : false), /* with locked monitors */ (locked_synchronizers ? true : false) /* with locked synchronizers */); VMThread::execute(&op); } int num_snapshots = dump_result.num_snapshots(); // create the result ThreadInfo[] object klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL); instanceKlassHandle ik (THREAD, k); objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL); objArrayHandle result_h(THREAD, r); int index = 0; for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) { if (ts->threadObj() == NULL) { // if the thread does not exist or now it is terminated, set threadinfo to NULL result_h->obj_at_put(index, NULL); continue; } ThreadStackTrace* stacktrace = ts->get_stack_trace(); assert(stacktrace != NULL, "Must have a stack trace dumped"); // Create Object[] filled with locked monitors // Create int[] filled with the stack depth where a monitor was locked int num_frames = stacktrace->get_stack_depth(); int num_locked_monitors = stacktrace->num_jni_locked_monitors(); // Count the total number of locked monitors for (int i = 0; i < num_frames; i++) { StackFrameInfo* frame = stacktrace->stack_frame_at(i); num_locked_monitors += frame->num_locked_monitors(); } objArrayHandle monitors_array; typeArrayHandle depths_array; objArrayHandle synchronizers_array; if (locked_monitors) { // Constructs Object[] and int[] to contain the object monitor and the stack depth // where the thread locked it objArrayOop array = oopFactory::new_system_objArray(num_locked_monitors, CHECK_NULL); objArrayHandle mh(THREAD, array); monitors_array = mh; typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL); typeArrayHandle dh(THREAD, tarray); depths_array = dh; int count = 0; int j = 0; for (int depth = 0; depth < num_frames; depth++) { StackFrameInfo* frame = stacktrace->stack_frame_at(depth); int len = frame->num_locked_monitors(); GrowableArray* locked_monitors = frame->locked_monitors(); for (j = 0; j < len; j++) { oop monitor = locked_monitors->at(j); assert(monitor != NULL && monitor->is_instance(), "must be a Java object"); monitors_array->obj_at_put(count, monitor); depths_array->int_at_put(count, depth); count++; } } GrowableArray* jni_locked_monitors = stacktrace->jni_locked_monitors(); for (j = 0; j < jni_locked_monitors->length(); j++) { oop object = jni_locked_monitors->at(j); assert(object != NULL && object->is_instance(), "must be a Java object"); monitors_array->obj_at_put(count, object); // Monitor locked via JNI MonitorEnter call doesn't have stack depth info depths_array->int_at_put(count, -1); count++; } assert(count == num_locked_monitors, "number of locked monitors doesn't match"); } if (locked_synchronizers) { // Create Object[] filled with locked JSR-166 synchronizers assert(ts->threadObj() != NULL, "Must be a valid JavaThread"); ThreadConcurrentLocks* tcl = ts->get_concurrent_locks(); GrowableArray* locks = (tcl != NULL ? tcl->owned_locks() : NULL); int num_locked_synchronizers = (locks != NULL ? locks->length() : 0); objArrayOop array = oopFactory::new_system_objArray(num_locked_synchronizers, CHECK_NULL); objArrayHandle sh(THREAD, array); synchronizers_array = sh; for (int k = 0; k < num_locked_synchronizers; k++) { synchronizers_array->obj_at_put(k, locks->at(k)); } } // Create java.lang.management.ThreadInfo object instanceOop info_obj = Management::create_thread_info_instance(ts, monitors_array, depths_array, synchronizers_array, CHECK_NULL); result_h->obj_at_put(index, info_obj); } return (jobjectArray) JNIHandles::make_local(env, result_h()); JVM_END // Returns an array of Class objects. JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env)) ResourceMark rm(THREAD); LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter int num_classes = lce.num_loaded_classes(); objArrayOop r = oopFactory::new_objArray(SystemDictionary::class_klass(), num_classes, CHECK_0); objArrayHandle classes_ah(THREAD, r); for (int i = 0; i < num_classes; i++) { KlassHandle kh = lce.get_klass(i); oop mirror = Klass::cast(kh())->java_mirror(); classes_ah->obj_at_put(i, mirror); } return (jobjectArray) JNIHandles::make_local(env, classes_ah()); JVM_END // Reset statistic. Return true if the requested statistic is reset. // Otherwise, return false. // // Input parameters: // obj - specify which instance the statistic associated with to be reset // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object. // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID. // type - the type of statistic to be reset // JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type)) ResourceMark rm(THREAD); switch (type) { case JMM_STAT_PEAK_THREAD_COUNT: ThreadService::reset_peak_thread_count(); return true; case JMM_STAT_THREAD_CONTENTION_COUNT: case JMM_STAT_THREAD_CONTENTION_TIME: { jlong tid = obj.j; if (tid < 0) { THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE); } // Look for the JavaThread of this given tid MutexLockerEx ml(Threads_lock); if (tid == 0) { // reset contention statistics for all threads if tid == 0 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) { if (type == JMM_STAT_THREAD_CONTENTION_COUNT) { ThreadService::reset_contention_count_stat(java_thread); } else { ThreadService::reset_contention_time_stat(java_thread); } } } else { // reset contention statistics for a given thread JavaThread* java_thread = find_java_thread_from_id(tid); if (java_thread == NULL) { return false; } if (type == JMM_STAT_THREAD_CONTENTION_COUNT) { ThreadService::reset_contention_count_stat(java_thread); } else { ThreadService::reset_contention_time_stat(java_thread); } } return true; break; } case JMM_STAT_PEAK_POOL_USAGE: { jobject o = obj.l; if (o == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); } oop pool_obj = JNIHandles::resolve(o); assert(pool_obj->is_instance(), "Should be an instanceOop"); instanceHandle ph(THREAD, (instanceOop) pool_obj); MemoryPool* pool = MemoryService::get_memory_pool(ph); if (pool != NULL) { pool->reset_peak_memory_usage(); return true; } break; } case JMM_STAT_GC_STAT: { jobject o = obj.l; if (o == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); } GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0); if (mgr != NULL) { mgr->reset_gc_stat(); return true; } break; } default: assert(0, "Unknown Statistic Type"); } return false; JVM_END // Returns the fast estimate of CPU time consumed by // a given thread (in nanoseconds). // If thread_id == 0, return CPU time for the current thread. JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id)) if (!os::is_thread_cpu_time_supported()) { return -1; } if (thread_id < 0) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "Invalid thread ID", -1); } JavaThread* java_thread = NULL; if (thread_id == 0) { // current thread return os::current_thread_cpu_time(); } else { MutexLockerEx ml(Threads_lock); java_thread = find_java_thread_from_id(thread_id); if (java_thread != NULL) { return os::thread_cpu_time((Thread*) java_thread); } } return -1; JVM_END // Returns the CPU time consumed by a given thread (in nanoseconds). // If thread_id == 0, CPU time for the current thread is returned. // If user_sys_cpu_time = true, user level and system CPU time of // a given thread is returned; otherwise, only user level CPU time // is returned. JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time)) if (!os::is_thread_cpu_time_supported()) { return -1; } if (thread_id < 0) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "Invalid thread ID", -1); } JavaThread* java_thread = NULL; if (thread_id == 0) { // current thread return os::current_thread_cpu_time(user_sys_cpu_time != 0); } else { MutexLockerEx ml(Threads_lock); java_thread = find_java_thread_from_id(thread_id); if (java_thread != NULL) { return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0); } } return -1; JVM_END // Returns a String array of all VM global flag names JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env)) // last flag entry is always NULL, so subtract 1 int nFlags = (int) Flag::numFlags - 1; // allocate a temp array objArrayOop r = oopFactory::new_objArray(SystemDictionary::string_klass(), nFlags, CHECK_0); objArrayHandle flags_ah(THREAD, r); int num_entries = 0; for (int i = 0; i < nFlags; i++) { Flag* flag = &Flag::flags[i]; // Exclude the locked (experimental, diagnostic) flags if (flag->is_unlocked() || flag->is_unlocker()) { Handle s = java_lang_String::create_from_str(flag->name, CHECK_0); flags_ah->obj_at_put(num_entries, s()); num_entries++; } } if (num_entries < nFlags) { // Return array of right length objArrayOop res = oopFactory::new_objArray(SystemDictionary::string_klass(), num_entries, CHECK_0); for(int i = 0; i < num_entries; i++) { res->obj_at_put(i, flags_ah->obj_at(i)); } return (jobjectArray)JNIHandles::make_local(env, res); } return (jobjectArray)JNIHandles::make_local(env, flags_ah()); JVM_END // utility function used by jmm_GetVMGlobals void add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) { Handle flag_name; if (name() == NULL) { flag_name = java_lang_String::create_from_str(flag->name, CHECK); } else { flag_name = name; } global->name = (jstring)JNIHandles::make_local(env, flag_name()); global->type = JMM_VMGLOBAL_TYPE_UNKNOWN; if (flag->is_bool()) { global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE; global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN; } else if (flag->is_intx()) { global->value.j = (jlong)flag->get_intx(); global->type = JMM_VMGLOBAL_TYPE_JLONG; } else if (flag->is_uintx()) { global->value.j = (jlong)flag->get_uintx(); global->type = JMM_VMGLOBAL_TYPE_JLONG; } else if (flag->is_ccstr()) { Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK); global->value.l = (jobject)JNIHandles::make_local(env, str()); global->type = JMM_VMGLOBAL_TYPE_JSTRING; } global->writeable = flag->is_writeable(); global->external = flag->is_external(); switch (flag->origin) { case DEFAULT: global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT; break; case COMMAND_LINE: global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE; break; case ENVIRON_VAR: global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR; break; case CONFIG_FILE: global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE; break; case MANAGEMENT: global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT; break; case ERGONOMIC: global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC; break; default: global->origin = JMM_VMGLOBAL_ORIGIN_OTHER; } } // Fill globals array of count length with jmmVMGlobal entries // specified by names. If names == NULL, fill globals array // with all Flags. Return value is number of entries // created in globals. // If a Flag with a given name in an array element does not // exist, globals[i].name will be set to NULL. JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env, jobjectArray names, jmmVMGlobal *globals, jint count)) if (globals == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), 0); } ResourceMark rm(THREAD); if (names != NULL) { // return the requested globals objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names)); objArrayHandle names_ah(THREAD, ta); // Make sure we have a String array klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass(); if (element_klass != SystemDictionary::string_klass()) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "Array element type is not String class", 0); } int names_length = names_ah->length(); int num_entries = 0; for (int i = 0; i < names_length && i < count; i++) { oop s = names_ah->obj_at(i); if (s == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), 0); } Handle sh(THREAD, s); char* str = java_lang_String::as_utf8_string(s); Flag* flag = Flag::find_flag(str, strlen(str)); if (flag != NULL) { add_global_entry(env, sh, &globals[i], flag, THREAD); num_entries++; } else { globals[i].name = NULL; } } return num_entries; } else { // return all globals if names == NULL // last flag entry is always NULL, so subtract 1 int nFlags = (int) Flag::numFlags - 1; Handle null_h; int num_entries = 0; for (int i = 0; i < nFlags && num_entries < count; i++) { Flag* flag = &Flag::flags[i]; // Exclude the locked (diagnostic, experimental) flags if (flag->is_unlocked() || flag->is_unlocker()) { add_global_entry(env, null_h, &globals[num_entries], flag, THREAD); num_entries++; } } return num_entries; } JVM_END JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value)) ResourceMark rm(THREAD); oop fn = JNIHandles::resolve_external_guard(flag_name); if (fn == NULL) { THROW_MSG(vmSymbols::java_lang_NullPointerException(), "The flag name cannot be null."); } char* name = java_lang_String::as_utf8_string(fn); Flag* flag = Flag::find_flag(name, strlen(name)); if (flag == NULL) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Flag does not exist."); } if (!flag->is_writeable()) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "This flag is not writeable."); } bool succeed; if (flag->is_bool()) { bool bvalue = (new_value.z == JNI_TRUE ? true : false); succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT); } else if (flag->is_intx()) { intx ivalue = new_value.j; succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT); } else if (flag->is_uintx()) { uintx uvalue = new_value.j; succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT); } else if (flag->is_ccstr()) { oop str = JNIHandles::resolve_external_guard(new_value.l); if (str == NULL) { THROW(vmSymbols::java_lang_NullPointerException()); } ccstr svalue = java_lang_String::as_utf8_string(str); succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT); } assert(succeed, "Setting flag should succeed"); JVM_END class ThreadTimesClosure: public ThreadClosure { private: objArrayOop _names; typeArrayOop _times; int _names_len; int _times_len; int _count; public: ThreadTimesClosure(objArrayOop names, typeArrayOop times); virtual void do_thread(Thread* thread); int count() { return _count; } }; ThreadTimesClosure::ThreadTimesClosure(objArrayOop names, typeArrayOop times) { assert(names != NULL, "names was NULL"); assert(times != NULL, "times was NULL"); _names = names; _names_len = names->length(); _times = times; _times_len = times->length(); _count = 0; } void ThreadTimesClosure::do_thread(Thread* thread) { Handle s; assert(thread != NULL, "thread was NULL"); // exclude externally visible JavaThreads if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) { return; } if (_count >= _names_len || _count >= _times_len) { // skip if the result array is not big enough return; } EXCEPTION_MARK; assert(thread->name() != NULL, "All threads should have a name"); s = java_lang_String::create_from_str(thread->name(), CHECK); _names->obj_at_put(_count, s()); _times->long_at_put(_count, os::is_thread_cpu_time_supported() ? os::thread_cpu_time(thread) : -1); _count++; } // Fills names with VM internal thread names and times with the corresponding // CPU times. If names or times is NULL, a NullPointerException is thrown. // If the element type of names is not String, an IllegalArgumentException is // thrown. // If an array is not large enough to hold all the entries, only the entries // that fit will be returned. Return value is the number of VM internal // threads entries. JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env, jobjectArray names, jlongArray times)) if (names == NULL || times == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), 0); } objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names)); objArrayHandle names_ah(THREAD, na); // Make sure we have a String array klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass(); if (element_klass != SystemDictionary::string_klass()) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "Array element type is not String class", 0); } typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times)); typeArrayHandle times_ah(THREAD, ta); ThreadTimesClosure ttc(names_ah(), times_ah()); { MutexLockerEx ml(Threads_lock); Threads::threads_do(&ttc); } return ttc.count(); JVM_END static Handle find_deadlocks(bool object_monitors_only, TRAPS) { ResourceMark rm(THREAD); VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */); VMThread::execute(&op); DeadlockCycle* deadlocks = op.result(); if (deadlocks == NULL) { // no deadlock found and return return Handle(); } int num_threads = 0; DeadlockCycle* cycle; for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) { num_threads += cycle->num_threads(); } objArrayOop r = oopFactory::new_objArray(SystemDictionary::thread_klass(), num_threads, CHECK_NH); objArrayHandle threads_ah(THREAD, r); int index = 0; for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) { GrowableArray* deadlock_threads = cycle->threads(); int len = deadlock_threads->length(); for (int i = 0; i < len; i++) { threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj()); index++; } } return threads_ah; } // Finds cycles of threads that are deadlocked involved in object monitors // and JSR-166 synchronizers. // Returns an array of Thread objects which are in deadlock, if any. // Otherwise, returns NULL. // // Input parameter: // object_monitors_only - if true, only check object monitors // JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only)) Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0); return (jobjectArray) JNIHandles::make_local(env, result()); JVM_END // Finds cycles of threads that are deadlocked on monitor locks // Returns an array of Thread objects which are in deadlock, if any. // Otherwise, returns NULL. JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env)) Handle result = find_deadlocks(true, CHECK_0); return (jobjectArray) JNIHandles::make_local(env, result()); JVM_END // Gets the information about GC extension attributes including // the name of the attribute, its type, and a short description. // // Input parameters: // mgr - GC memory manager // info - caller allocated array of jmmExtAttributeInfo // count - number of elements of the info array // // Returns the number of GC extension attributes filled in the info array; or // -1 if info is not big enough // JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count)) // All GC memory managers have 1 attribute (number of GC threads) if (count == 0) { return 0; } if (info == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), 0); } info[0].name = "GcThreadCount"; info[0].type = 'I'; info[0].description = "Number of GC threads"; return 1; JVM_END // verify the given array is an array of java/lang/management/MemoryUsage objects // of a given length and return the objArrayOop static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) { if (array == NULL) { THROW_(vmSymbols::java_lang_NullPointerException(), 0); } objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array)); objArrayHandle array_h(THREAD, oa); // array must be of the given length if (length != array_h->length()) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "The length of the given MemoryUsage array does not match the number of memory pools.", 0); } // check if the element of array is of type MemoryUsage class klassOop usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0); klassOop element_klass = objArrayKlass::cast(array_h->klass())->element_klass(); if (element_klass != usage_klass) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "The element type is not MemoryUsage class", 0); } return array_h(); } // Gets the statistics of the last GC of a given GC memory manager. // Input parameters: // obj - GarbageCollectorMXBean object // gc_stat - caller allocated jmmGCStat where: // a. before_gc_usage - array of MemoryUsage objects // b. after_gc_usage - array of MemoryUsage objects // c. gc_ext_attributes_values_size is set to the // gc_ext_attribute_values array allocated // d. gc_ext_attribute_values is a caller allocated array of jvalue. // // On return, // gc_index == 0 indicates no GC statistics available // // before_gc_usage and after_gc_usage - filled with per memory pool // before and after GC usage in the same order as the memory pools // returned by GetMemoryPools for a given GC memory manager. // num_gc_ext_attributes indicates the number of elements in // the gc_ext_attribute_values array is filled; or // -1 if the gc_ext_attributes_values array is not big enough // JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat)) ResourceMark rm(THREAD); if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) { THROW(vmSymbols::java_lang_NullPointerException()); } // Get the GCMemoryManager GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK); if (mgr->last_gc_stat() == NULL) { gc_stat->gc_index = 0; return; } // Make a copy of the last GC statistics // GC may occur while constructing the last GC information int num_pools = MemoryService::num_memory_pools(); GCStatInfo* stat = new GCStatInfo(num_pools); stat->copy_stat(mgr->last_gc_stat()); gc_stat->gc_index = stat->gc_index(); gc_stat->start_time = Management::ticks_to_ms(stat->start_time()); gc_stat->end_time = Management::ticks_to_ms(stat->end_time()); // Current implementation does not have GC extension attributes gc_stat->num_gc_ext_attributes = 0; // Fill the arrays of MemoryUsage objects with before and after GC // per pool memory usage objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc, num_pools, CHECK); objArrayHandle usage_before_gc_ah(THREAD, bu); objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc, num_pools, CHECK); objArrayHandle usage_after_gc_ah(THREAD, au); for (int i = 0; i < num_pools; i++) { Handle before_usage = MemoryService::create_MemoryUsage_obj(stat->before_gc_usage_for_pool(i), CHECK); Handle after_usage; MemoryUsage u = stat->after_gc_usage_for_pool(i); if (u.max_size() == 0 && u.used() > 0) { // If max size == 0, this pool is a survivor space. // Set max size = -1 since the pools will be swapped after GC. MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1); after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK); } else { after_usage = MemoryService::create_MemoryUsage_obj(stat->after_gc_usage_for_pool(i), CHECK); } usage_before_gc_ah->obj_at_put(i, before_usage()); usage_after_gc_ah->obj_at_put(i, after_usage()); } if (gc_stat->gc_ext_attribute_values_size > 0) { // Current implementation only has 1 attribute (number of GC threads) // The type is 'I' gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads(); } JVM_END // Dump heap - Returns 0 if succeeds. JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live)) #ifndef SERVICES_KERNEL ResourceMark rm(THREAD); oop on = JNIHandles::resolve_external_guard(outputfile); if (on == NULL) { THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "Output file name cannot be null.", -1); } char* name = java_lang_String::as_utf8_string(on); if (name == NULL) { THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "Output file name cannot be null.", -1); } HeapDumper dumper(live ? true : false); if (dumper.dump(name) != 0) { const char* errmsg = dumper.error_as_C_string(); THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1); } return 0; #else // SERVICES_KERNEL return -1; #endif // SERVICES_KERNEL JVM_END jlong Management::ticks_to_ms(jlong ticks) { assert(os::elapsed_frequency() > 0, "Must be non-zero"); return (jlong)(((double)ticks / (double)os::elapsed_frequency()) * (double)1000.0); } const struct jmmInterface_1_ jmm_interface = { NULL, NULL, jmm_GetVersion, jmm_GetOptionalSupport, jmm_GetInputArguments, jmm_GetThreadInfo, jmm_GetInputArgumentArray, jmm_GetMemoryPools, jmm_GetMemoryManagers, jmm_GetMemoryPoolUsage, jmm_GetPeakMemoryPoolUsage, NULL, jmm_GetMemoryUsage, jmm_GetLongAttribute, jmm_GetBoolAttribute, jmm_SetBoolAttribute, jmm_GetLongAttributes, jmm_FindMonitorDeadlockedThreads, jmm_GetThreadCpuTime, jmm_GetVMGlobalNames, jmm_GetVMGlobals, jmm_GetInternalThreadTimes, jmm_ResetStatistic, jmm_SetPoolSensor, jmm_SetPoolThreshold, jmm_GetPoolCollectionUsage, jmm_GetGCExtAttributeInfo, jmm_GetLastGCStat, jmm_GetThreadCpuTimeWithKind, NULL, jmm_DumpHeap0, jmm_FindDeadlockedThreads, jmm_SetVMGlobal, NULL, jmm_DumpThreads }; void* Management::get_jmm_interface(int version) { if (version == JMM_VERSION_1_0) { return (void*) &jmm_interface; } return NULL; }