/*
* 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 (threshold > max_intx) {
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
"Invalid threshold value > max value of size_t",
-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 diagnostic 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<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(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<oop>* 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<oop>* 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<instanceOop>* 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 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 diagnostic 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<JavaThread*>* 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;
}