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1 /*
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2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_classLoadingService.cpp.incl"
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27
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28 #ifdef DTRACE_ENABLED
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29
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30 // Only bother with this argument setup if dtrace is available
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31
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32 HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool);
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33 HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool);
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34
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35 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \
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36 { \
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37 char* data = NULL; \
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38 int len = 0; \
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39 symbolOop name = (clss)->name(); \
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40 if (name != NULL) { \
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41 data = (char*)name->bytes(); \
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42 len = name->utf8_length(); \
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43 } \
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44 HS_DTRACE_PROBE4(hotspot, class__##type, \
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45 data, len, (clss)->class_loader(), (shared)); \
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46 }
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47
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48 #else // ndef DTRACE_ENABLED
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49
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50 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared)
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51
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52 #endif
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53
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54 // counters for classes loaded from class files
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55 PerfCounter* ClassLoadingService::_classes_loaded_count = NULL;
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56 PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL;
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57 PerfCounter* ClassLoadingService::_classbytes_loaded = NULL;
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58 PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL;
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59
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60 // counters for classes loaded from shared archive
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61 PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL;
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62 PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL;
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63 PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL;
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64 PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL;
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65 PerfVariable* ClassLoadingService::_class_methods_size = NULL;
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66
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67 void ClassLoadingService::init() {
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68 EXCEPTION_MARK;
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69
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70 // These counters are for java.lang.management API support.
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71 // They are created even if -XX:-UsePerfData is set and in
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72 // that case, they will be allocated on C heap.
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73 _classes_loaded_count =
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74 PerfDataManager::create_counter(JAVA_CLS, "loadedClasses",
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75 PerfData::U_Events, CHECK);
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76
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77 _classes_unloaded_count =
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78 PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses",
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79 PerfData::U_Events, CHECK);
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80
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81 _shared_classes_loaded_count =
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82 PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses",
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83 PerfData::U_Events, CHECK);
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84
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85 _shared_classes_unloaded_count =
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86 PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses",
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87 PerfData::U_Events, CHECK);
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88
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89 if (UsePerfData) {
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90 _classbytes_loaded =
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91 PerfDataManager::create_counter(SUN_CLS, "loadedBytes",
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92 PerfData::U_Bytes, CHECK);
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93
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94 _classbytes_unloaded =
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95 PerfDataManager::create_counter(SUN_CLS, "unloadedBytes",
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96 PerfData::U_Bytes, CHECK);
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97 _shared_classbytes_loaded =
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98 PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes",
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99 PerfData::U_Bytes, CHECK);
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100
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101 _shared_classbytes_unloaded =
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102 PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes",
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103 PerfData::U_Bytes, CHECK);
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104 _class_methods_size =
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105 PerfDataManager::create_variable(SUN_CLS, "methodBytes",
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106 PerfData::U_Bytes, CHECK);
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107 }
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108 }
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109
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110 void ClassLoadingService::notify_class_unloaded(instanceKlass* k) {
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111 DTRACE_CLASSLOAD_PROBE(unloaded, k, false);
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112 // Classes that can be unloaded must be non-shared
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113 _classes_unloaded_count->inc();
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114
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115 if (UsePerfData) {
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116 // add the class size
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117 size_t size = compute_class_size(k);
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118 _classbytes_unloaded->inc(size);
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119
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120 // Compute method size & subtract from running total.
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121 // We are called during phase 1 of mark sweep, so it's
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122 // still ok to iterate through methodOops here.
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123 objArrayOop methods = k->methods();
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124 for (int i = 0; i < methods->length(); i++) {
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125 _class_methods_size->inc(-methods->obj_at(i)->size());
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126 }
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127 }
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128
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129 if (TraceClassUnloading) {
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130 ResourceMark rm;
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131 tty->print_cr("[Unloading class %s]", k->external_name());
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132 }
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133 }
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134
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135 void ClassLoadingService::notify_class_loaded(instanceKlass* k, bool shared_class) {
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136 DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class);
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137 PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count
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138 : _classes_loaded_count);
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139 // increment the count
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140 classes_counter->inc();
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141
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142 if (UsePerfData) {
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143 PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded
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144 : _classbytes_loaded);
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145 // add the class size
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146 size_t size = compute_class_size(k);
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147 classbytes_counter->inc(size);
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148 }
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149 }
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150
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151 size_t ClassLoadingService::compute_class_size(instanceKlass* k) {
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152 // lifted from ClassStatistics.do_class(klassOop k)
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153
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154 size_t class_size = 0;
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155
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156 class_size += k->as_klassOop()->size();
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157
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158 if (k->oop_is_instance()) {
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159 class_size += k->methods()->size();
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160 class_size += k->constants()->size();
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161 class_size += k->local_interfaces()->size();
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162 class_size += k->transitive_interfaces()->size();
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163 // We do not have to count implementors, since we only store one!
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164 class_size += k->fields()->size();
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165 }
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166 return class_size * oopSize;
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167 }
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168
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169
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170 bool ClassLoadingService::set_verbose(bool verbose) {
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171 MutexLocker m(Management_lock);
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172
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173 // verbose will be set to the previous value
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174 bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT);
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175 assert(succeed, "Setting TraceClassLoading flag fails");
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176 reset_trace_class_unloading();
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177
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178 return verbose;
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179 }
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180
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181 // Caller to this function must own Management_lock
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182 void ClassLoadingService::reset_trace_class_unloading() {
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183 assert(Management_lock->owned_by_self(), "Must own the Management_lock");
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184 bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();
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185 bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT);
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186 assert(succeed, "Setting TraceClassUnLoading flag fails");
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187 }
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188
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189 GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL;
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190 Thread* LoadedClassesEnumerator::_current_thread = NULL;
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191
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192 LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) {
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193 assert(cur_thread == Thread::current(), "Check current thread");
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194
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195 int init_size = ClassLoadingService::loaded_class_count();
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196 _klass_handle_array = new GrowableArray<KlassHandle>(init_size);
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197
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198 // For consistency of the loaded classes, grab the SystemDictionary lock
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199 MutexLocker sd_mutex(SystemDictionary_lock);
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200
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201 // Set _loaded_classes and _current_thread and begin enumerating all classes.
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202 // Only one thread will do the enumeration at a time.
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203 // These static variables are needed and they are used by the static method
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204 // add_loaded_class called from classes_do().
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205 _loaded_classes = _klass_handle_array;
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206 _current_thread = cur_thread;
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207
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208 SystemDictionary::classes_do(&add_loaded_class);
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209
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210 // FIXME: Exclude array klasses for now
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211 // Universe::basic_type_classes_do(&add_loaded_class);
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212 }
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