jdk8-mips64-public/hotspot: src/share/vm/services/classLoadingService.cpp@a42c07c38c47

7132515: Add dcmd to manage UnlockingCommercialFeature flag
Summary: Added dcmd to unlock or check status of UnlockingCommercialFeature flag
Reviewed-by: fparain, rottenha

     1 /*

     2  * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "classfile/systemDictionary.hpp"

    27 #include "memory/allocation.hpp"

    28 #include "memory/universe.hpp"

    29 #include "oops/oop.inline.hpp"

    30 #include "runtime/mutexLocker.hpp"

    31 #include "services/classLoadingService.hpp"

    32 #include "services/memoryService.hpp"

    33 #include "utilities/dtrace.hpp"

    35 #ifdef DTRACE_ENABLED

    37 // Only bother with this argument setup if dtrace is available

    39 #ifndef USDT2

    41 HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool);

    42 HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool);

    44 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared)  \

    45   {                                                 \

    46     char* data = NULL;                              \

    47     int len = 0;                                    \

    48     Symbol* name = (clss)->name();                  \

    49     if (name != NULL) {                             \

    50       data = (char*)name->bytes();                  \

    51       len = name->utf8_length();                    \

    52     }                                               \

    53     HS_DTRACE_PROBE4(hotspot, class__##type,        \

    54       data, len, (clss)->class_loader(), (shared)); \

    55   }

    57 #else /* USDT2 */

    59 #define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED

    60 #define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED

    61 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared)  \

    62   {                                                 \

    63     char* data = NULL;                              \

    64     int len = 0;                                    \

    65     Symbol* name = (clss)->name();                  \

    66     if (name != NULL) {                             \

    67       data = (char*)name->bytes();                  \

    68       len = name->utf8_length();                    \

    69     }                                               \

    70     HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \

    71       data, len, (clss)->class_loader(), (shared)); \

    72   }

    74 #endif /* USDT2 */

    75 #else //  ndef DTRACE_ENABLED

    77 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared)

    79 #endif

    81 // counters for classes loaded from class files

    82 PerfCounter*    ClassLoadingService::_classes_loaded_count = NULL;

    83 PerfCounter*    ClassLoadingService::_classes_unloaded_count = NULL;

    84 PerfCounter*    ClassLoadingService::_classbytes_loaded = NULL;

    85 PerfCounter*    ClassLoadingService::_classbytes_unloaded = NULL;

    87 // counters for classes loaded from shared archive

    88 PerfCounter*    ClassLoadingService::_shared_classes_loaded_count = NULL;

    89 PerfCounter*    ClassLoadingService::_shared_classes_unloaded_count = NULL;

    90 PerfCounter*    ClassLoadingService::_shared_classbytes_loaded = NULL;

    91 PerfCounter*    ClassLoadingService::_shared_classbytes_unloaded = NULL;

    92 PerfVariable*   ClassLoadingService::_class_methods_size = NULL;

    94 void ClassLoadingService::init() {

    95   EXCEPTION_MARK;

    97   // These counters are for java.lang.management API support.

    98   // They are created even if -XX:-UsePerfData is set and in

    99   // that case, they will be allocated on C heap.

   100   _classes_loaded_count =

   101                  PerfDataManager::create_counter(JAVA_CLS, "loadedClasses",

   102                                                  PerfData::U_Events, CHECK);

   104   _classes_unloaded_count =

   105                  PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses",

   106                                                  PerfData::U_Events, CHECK);

   108   _shared_classes_loaded_count =

   109                  PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses",

   110                                                  PerfData::U_Events, CHECK);

   112   _shared_classes_unloaded_count =

   113                  PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses",

   114                                                  PerfData::U_Events, CHECK);

   116   if (UsePerfData) {

   117     _classbytes_loaded =

   118                  PerfDataManager::create_counter(SUN_CLS, "loadedBytes",

   119                                                  PerfData::U_Bytes, CHECK);

   121     _classbytes_unloaded =

   122                  PerfDataManager::create_counter(SUN_CLS, "unloadedBytes",

   123                                                  PerfData::U_Bytes, CHECK);

   124     _shared_classbytes_loaded =

   125                  PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes",

   126                                                  PerfData::U_Bytes, CHECK);

   128     _shared_classbytes_unloaded =

   129                  PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes",

   130                                                  PerfData::U_Bytes, CHECK);

   131     _class_methods_size =

   132                  PerfDataManager::create_variable(SUN_CLS, "methodBytes",

   133                                                   PerfData::U_Bytes, CHECK);

   134   }

   135 }

   137 void ClassLoadingService::notify_class_unloaded(instanceKlass* k) {

   138   DTRACE_CLASSLOAD_PROBE(unloaded, k, false);

   139   // Classes that can be unloaded must be non-shared

   140   _classes_unloaded_count->inc();

   142   if (UsePerfData) {

   143     // add the class size

   144     size_t size = compute_class_size(k);

   145     _classbytes_unloaded->inc(size);

   147     // Compute method size & subtract from running total.

   148     // We are called during phase 1 of mark sweep, so it's

   149     // still ok to iterate through methodOops here.

   150     objArrayOop methods = k->methods();

   151     for (int i = 0; i < methods->length(); i++) {

   152       _class_methods_size->inc(-methods->obj_at(i)->size());

   153     }

   154   }

   156   if (TraceClassUnloading) {

   157     ResourceMark rm;

   158     tty->print_cr("[Unloading class %s]", k->external_name());

   159   }

   160 }

   162 void ClassLoadingService::notify_class_loaded(instanceKlass* k, bool shared_class) {

   163   DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class);

   164   PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count

   165                                                : _classes_loaded_count);

   166   // increment the count

   167   classes_counter->inc();

   169   if (UsePerfData) {

   170     PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded

   171                                                     : _classbytes_loaded);

   172     // add the class size

   173     size_t size = compute_class_size(k);

   174     classbytes_counter->inc(size);

   175   }

   176 }

   178 size_t ClassLoadingService::compute_class_size(instanceKlass* k) {

   179   // lifted from ClassStatistics.do_class(klassOop k)

   181   size_t class_size = 0;

   183   class_size += k->as_klassOop()->size();

   185   if (k->oop_is_instance()) {

   186     class_size += k->methods()->size();

   187     class_size += k->constants()->size();

   188     class_size += k->local_interfaces()->size();

   189     class_size += k->transitive_interfaces()->size();

   190     // We do not have to count implementors, since we only store one!

   191     class_size += k->fields()->size();

   192   }

   193   return class_size * oopSize;

   194 }

   197 bool ClassLoadingService::set_verbose(bool verbose) {

   198   MutexLocker m(Management_lock);

   200   // verbose will be set to the previous value

   201   bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT);

   202   assert(succeed, "Setting TraceClassLoading flag fails");

   203   reset_trace_class_unloading();

   205   return verbose;

   206 }

   208 // Caller to this function must own Management_lock

   209 void ClassLoadingService::reset_trace_class_unloading() {

   210   assert(Management_lock->owned_by_self(), "Must own the Management_lock");

   211   bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();

   212   bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT);

   213   assert(succeed, "Setting TraceClassUnLoading flag fails");

   214 }

   216 GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL;

   217 Thread* LoadedClassesEnumerator::_current_thread = NULL;

   219 LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) {

   220   assert(cur_thread == Thread::current(), "Check current thread");

   222   int init_size = ClassLoadingService::loaded_class_count();

   223   _klass_handle_array = new GrowableArray<KlassHandle>(init_size);

   225   // For consistency of the loaded classes, grab the SystemDictionary lock

   226   MutexLocker sd_mutex(SystemDictionary_lock);

   228   // Set _loaded_classes and _current_thread and begin enumerating all classes.

   229   // Only one thread will do the enumeration at a time.

   230   // These static variables are needed and they are used by the static method

   231   // add_loaded_class called from classes_do().

   232   _loaded_classes = _klass_handle_array;

   233   _current_thread = cur_thread;

   235   SystemDictionary::classes_do(&add_loaded_class);

   237   // FIXME: Exclude array klasses for now

   238   // Universe::basic_type_classes_do(&add_loaded_class);

   239 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/services/classLoadingService.cpp@a42c07c38c47

src/share/vm/services/classLoadingService.cpp