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annotate src/share/vm/services/gcNotifier.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents d2a62e0f25eb
children 32e3bada0978
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1 /*
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "classfile/systemDictionary.hpp"
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27 #include "classfile/vmSymbols.hpp"
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28 #include "oops/oop.inline.hpp"
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29 #include "runtime/interfaceSupport.hpp"
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30 #include "runtime/java.hpp"
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31 #include "runtime/javaCalls.hpp"
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32 #include "runtime/mutex.hpp"
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33 #include "runtime/mutexLocker.hpp"
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34 #include "services/gcNotifier.hpp"
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35 #include "services/management.hpp"
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36 #include "services/memoryService.hpp"
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37 #include "memoryManager.hpp"
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38 #include "memory/oopFactory.hpp"
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39
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40 GCNotificationRequest *GCNotifier::first_request = NULL;
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41 GCNotificationRequest *GCNotifier::last_request = NULL;
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42
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43 void GCNotifier::pushNotification(GCMemoryManager *mgr, const char *action, const char *cause) {
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44 // Make a copy of the last GC statistics
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45 // GC may occur between now and the creation of the notification
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46 int num_pools = MemoryService::num_memory_pools();
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47 // stat is deallocated inside GCNotificationRequest
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48 GCStatInfo* stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(num_pools);
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49 mgr->get_last_gc_stat(stat);
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50 GCNotificationRequest *request = new GCNotificationRequest(os::javaTimeMillis(),mgr,action,cause,stat);
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51 addRequest(request);
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52 }
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53
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54 void GCNotifier::addRequest(GCNotificationRequest *request) {
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55 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
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56 if(first_request == NULL) {
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57 first_request = request;
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58 } else {
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59 last_request->next = request;
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60 }
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61 last_request = request;
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62 Service_lock->notify_all();
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63 }
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64
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65 GCNotificationRequest *GCNotifier::getRequest() {
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66 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
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67 GCNotificationRequest *request = first_request;
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68 if(first_request != NULL) {
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69 first_request = first_request->next;
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70 }
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71 return request;
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72 }
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73
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74 bool GCNotifier::has_event() {
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75 return first_request != NULL;
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76 }
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77
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78 static Handle getGcInfoBuilder(GCMemoryManager *gcManager,TRAPS) {
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79
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80 Klass* k = Management::sun_management_GarbageCollectorImpl_klass(CHECK_NH);
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81 instanceKlassHandle gcMBeanKlass (THREAD, k);
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82
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83 instanceOop i = gcManager->get_memory_manager_instance(THREAD);
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84 instanceHandle ih(THREAD, i);
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85
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86 JavaValue result(T_OBJECT);
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87 JavaCallArguments args(ih);
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88
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89 JavaCalls::call_virtual(&result,
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90 gcMBeanKlass,
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91 vmSymbols::getGcInfoBuilder_name(),
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92 vmSymbols::getGcInfoBuilder_signature(),
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93 &args,
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94 CHECK_NH);
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95 return Handle(THREAD,(oop)result.get_jobject());
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96 }
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97
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98 static Handle createGcInfo(GCMemoryManager *gcManager, GCStatInfo *gcStatInfo,TRAPS) {
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99
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100 // Fill the arrays of MemoryUsage objects with before and after GC
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101 // per pool memory usage
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102
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103 Klass* mu_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_NH);
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104 instanceKlassHandle mu_kh(THREAD, mu_klass);
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105
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106 // The array allocations below should use a handle containing mu_klass
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107 // as the first allocation could trigger a GC, causing the actual
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108 // klass oop to move, and leaving mu_klass pointing to the old
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109 // location.
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110 objArrayOop bu = oopFactory::new_objArray(mu_kh(), MemoryService::num_memory_pools(), CHECK_NH);
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111 objArrayHandle usage_before_gc_ah(THREAD, bu);
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112 objArrayOop au = oopFactory::new_objArray(mu_kh(), MemoryService::num_memory_pools(), CHECK_NH);
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113 objArrayHandle usage_after_gc_ah(THREAD, au);
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114
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115 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
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116 Handle before_usage = MemoryService::create_MemoryUsage_obj(gcStatInfo->before_gc_usage_for_pool(i), CHECK_NH);
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117 Handle after_usage;
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118
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119 MemoryUsage u = gcStatInfo->after_gc_usage_for_pool(i);
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120 if (u.max_size() == 0 && u.used() > 0) {
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121 // If max size == 0, this pool is a survivor space.
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122 // Set max size = -1 since the pools will be swapped after GC.
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123 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
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124 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK_NH);
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125 } else {
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126 after_usage = MemoryService::create_MemoryUsage_obj(u, CHECK_NH);
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127 }
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128 usage_before_gc_ah->obj_at_put(i, before_usage());
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129 usage_after_gc_ah->obj_at_put(i, after_usage());
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130 }
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131
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132 // Current implementation only has 1 attribute (number of GC threads)
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133 // The type is 'I'
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134 objArrayOop extra_args_array = oopFactory::new_objArray(SystemDictionary::Integer_klass(), 1, CHECK_NH);
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135 objArrayHandle extra_array (THREAD, extra_args_array);
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136 Klass* itKlass = SystemDictionary::Integer_klass();
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137 instanceKlassHandle intK(THREAD, itKlass);
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138
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139 instanceHandle extra_arg_val = intK->allocate_instance_handle(CHECK_NH);
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140
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141 {
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142 JavaValue res(T_VOID);
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143 JavaCallArguments argsInt;
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144 argsInt.push_oop(extra_arg_val);
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145 argsInt.push_int(gcManager->num_gc_threads());
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146
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147 JavaCalls::call_special(&res,
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148 intK,
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149 vmSymbols::object_initializer_name(),
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150 vmSymbols::int_void_signature(),
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151 &argsInt,
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152 CHECK_NH);
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153 }
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154 extra_array->obj_at_put(0,extra_arg_val());
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155
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156 Klass* gcInfoklass = Management::com_sun_management_GcInfo_klass(CHECK_NH);
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157 instanceKlassHandle ik(THREAD, gcInfoklass);
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158
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159 Handle gcInfo_instance = ik->allocate_instance_handle(CHECK_NH);
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160
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161 JavaValue constructor_result(T_VOID);
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162 JavaCallArguments constructor_args(16);
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163 constructor_args.push_oop(gcInfo_instance);
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164 constructor_args.push_oop(getGcInfoBuilder(gcManager,THREAD));
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165 constructor_args.push_long(gcStatInfo->gc_index());
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166 constructor_args.push_long(Management::ticks_to_ms(gcStatInfo->start_time()));
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167 constructor_args.push_long(Management::ticks_to_ms(gcStatInfo->end_time()));
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168 constructor_args.push_oop(usage_before_gc_ah);
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169 constructor_args.push_oop(usage_after_gc_ah);
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170 constructor_args.push_oop(extra_array);
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171
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172 JavaCalls::call_special(&constructor_result,
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173 ik,
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174 vmSymbols::object_initializer_name(),
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175 vmSymbols::com_sun_management_GcInfo_constructor_signature(),
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176 &constructor_args,
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177 CHECK_NH);
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178
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179 return Handle(gcInfo_instance());
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180 }
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181
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182 void GCNotifier::sendNotification(TRAPS) {
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183 GCNotifier::sendNotificationInternal(THREAD);
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184 // Clearing pending exception to avoid premature termination of
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185 // the service thread
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186 if (HAS_PENDING_EXCEPTION) {
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187 CLEAR_PENDING_EXCEPTION;
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188 }
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189 }
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190
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191 class NotificationMark : public StackObj {
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192 // This class is used in GCNotifier::sendNotificationInternal to ensure that
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193 // the GCNotificationRequest object is properly cleaned up, whatever path
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194 // is used to exit the method.
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195 GCNotificationRequest* _request;
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196 public:
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197 NotificationMark(GCNotificationRequest* r) {
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198 _request = r;
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199 }
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200 ~NotificationMark() {
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201 assert(_request != NULL, "Sanity check");
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202 delete _request;
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203 }
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204 };
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205
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206 void GCNotifier::sendNotificationInternal(TRAPS) {
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207 ResourceMark rm(THREAD);
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208 HandleMark hm(THREAD);
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209 GCNotificationRequest *request = getRequest();
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210 if (request != NULL) {
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211 NotificationMark nm(request);
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212 Handle objGcInfo = createGcInfo(request->gcManager, request->gcStatInfo, THREAD);
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213
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214 Handle objName = java_lang_String::create_from_platform_dependent_str(request->gcManager->name(), CHECK);
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215 Handle objAction = java_lang_String::create_from_platform_dependent_str(request->gcAction, CHECK);
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216 Handle objCause = java_lang_String::create_from_platform_dependent_str(request->gcCause, CHECK);
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217
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218 Klass* k = Management::sun_management_GarbageCollectorImpl_klass(CHECK);
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219 instanceKlassHandle gc_mbean_klass(THREAD, k);
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220
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221 instanceOop gc_mbean = request->gcManager->get_memory_manager_instance(THREAD);
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222 instanceHandle gc_mbean_h(THREAD, gc_mbean);
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223 if (!gc_mbean_h->is_a(k)) {
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224 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
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225 "This GCMemoryManager doesn't have a GarbageCollectorMXBean");
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226 }
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227
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228 JavaValue result(T_VOID);
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229 JavaCallArguments args(gc_mbean_h);
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230 args.push_long(request->timestamp);
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231 args.push_oop(objName);
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232 args.push_oop(objAction);
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233 args.push_oop(objCause);
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234 args.push_oop(objGcInfo);
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235
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236 JavaCalls::call_virtual(&result,
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237 gc_mbean_klass,
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238 vmSymbols::createGCNotification_name(),
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239 vmSymbols::createGCNotification_signature(),
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240 &args,
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241 CHECK);
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242 }
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243 }
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244