1 /* 2 * Copyright (c) 2011, 2017, 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 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "oops/objArrayOop.inline.hpp" 29 #include "oops/oop.inline.hpp" 30 #include "runtime/java.hpp" 31 #include "runtime/javaCalls.hpp" 32 #include "runtime/mutex.hpp" 33 #include "runtime/mutexLocker.hpp" 34 #include "services/gcNotifier.hpp" 35 #include "services/management.hpp" 36 #include "services/memoryService.hpp" 37 #include "memoryManager.hpp" 38 #include "memory/oopFactory.hpp" 39 #include "memory/resourceArea.hpp" 40 41 GCNotificationRequest *GCNotifier::first_request = NULL; 42 GCNotificationRequest *GCNotifier::last_request = NULL; 43 44 void GCNotifier::pushNotification(GCMemoryManager *mgr, const char *action, const char *cause) { 45 // Make a copy of the last GC statistics 46 // GC may occur between now and the creation of the notification 47 int num_pools = MemoryService::num_memory_pools(); 48 // stat is deallocated inside GCNotificationRequest 49 GCStatInfo* stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(num_pools); 50 mgr->get_last_gc_stat(stat); 51 GCNotificationRequest *request = new GCNotificationRequest(os::javaTimeMillis(),mgr,action,cause,stat); 52 addRequest(request); 53 } 54 55 void GCNotifier::addRequest(GCNotificationRequest *request) { 56 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 57 if(first_request == NULL) { 58 first_request = request; 59 } else { 60 last_request->next = request; 61 } 62 last_request = request; 63 Service_lock->notify_all(); 64 } 65 66 GCNotificationRequest *GCNotifier::getRequest() { 67 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 68 GCNotificationRequest *request = first_request; 69 if(first_request != NULL) { 70 first_request = first_request->next; 71 } 72 return request; 73 } 74 75 bool GCNotifier::has_event() { 76 return first_request != NULL; 77 } 78 79 static Handle getGcInfoBuilder(GCMemoryManager *gcManager,TRAPS) { 80 81 Klass* gcMBeanKlass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK_NH); 82 83 instanceOop i = gcManager->get_memory_manager_instance(THREAD); 84 instanceHandle ih(THREAD, i); 85 86 JavaValue result(T_OBJECT); 87 JavaCallArguments args(ih); 88 89 JavaCalls::call_virtual(&result, 90 gcMBeanKlass, 91 vmSymbols::getGcInfoBuilder_name(), 92 vmSymbols::getGcInfoBuilder_signature(), 93 &args, 94 CHECK_NH); 95 return Handle(THREAD,(oop)result.get_jobject()); 96 } 97 98 static Handle createGcInfo(GCMemoryManager *gcManager, GCStatInfo *gcStatInfo,TRAPS) { 99 100 // Fill the arrays of MemoryUsage objects with before and after GC 101 // per pool memory usage 102 103 InstanceKlass* mu_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_NH); 104 105 // The array allocations below should use a handle containing mu_klass 106 // as the first allocation could trigger a GC, causing the actual 107 // klass oop to move, and leaving mu_klass pointing to the old 108 // location. 109 objArrayOop bu = oopFactory::new_objArray(mu_klass, MemoryService::num_memory_pools(), CHECK_NH); 110 objArrayHandle usage_before_gc_ah(THREAD, bu); 111 objArrayOop au = oopFactory::new_objArray(mu_klass, MemoryService::num_memory_pools(), CHECK_NH); 112 objArrayHandle usage_after_gc_ah(THREAD, au); 113 114 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 115 Handle before_usage = MemoryService::create_MemoryUsage_obj(gcStatInfo->before_gc_usage_for_pool(i), CHECK_NH); 116 Handle after_usage; 117 118 MemoryUsage u = gcStatInfo->after_gc_usage_for_pool(i); 119 if (u.max_size() == 0 && u.used() > 0) { 120 // If max size == 0, this pool is a survivor space. 121 // Set max size = -1 since the pools will be swapped after GC. 122 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1); 123 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK_NH); 124 } else { 125 after_usage = MemoryService::create_MemoryUsage_obj(u, CHECK_NH); 126 } 127 usage_before_gc_ah->obj_at_put(i, before_usage()); 128 usage_after_gc_ah->obj_at_put(i, after_usage()); 129 } 130 131 // Current implementation only has 1 attribute (number of GC threads) 132 // The type is 'I' 133 objArrayOop extra_args_array = oopFactory::new_objArray(SystemDictionary::Integer_klass(), 1, CHECK_NH); 134 objArrayHandle extra_array (THREAD, extra_args_array); 135 InstanceKlass* intK = SystemDictionary::Integer_klass(); 136 137 instanceHandle extra_arg_val = intK->allocate_instance_handle(CHECK_NH); 138 139 { 140 JavaValue res(T_VOID); 141 JavaCallArguments argsInt; 142 argsInt.push_oop(extra_arg_val); 143 argsInt.push_int(gcManager->num_gc_threads()); 144 145 JavaCalls::call_special(&res, 146 intK, 147 vmSymbols::object_initializer_name(), 148 vmSymbols::int_void_signature(), 149 &argsInt, 150 CHECK_NH); 151 } 152 extra_array->obj_at_put(0,extra_arg_val()); 153 154 InstanceKlass* gcInfoklass = Management::com_sun_management_GcInfo_klass(CHECK_NH); 155 156 Handle gcInfo_instance = gcInfoklass->allocate_instance_handle(CHECK_NH); 157 158 JavaValue constructor_result(T_VOID); 159 JavaCallArguments constructor_args(16); 160 constructor_args.push_oop(gcInfo_instance); 161 constructor_args.push_oop(getGcInfoBuilder(gcManager,THREAD)); 162 constructor_args.push_long(gcStatInfo->gc_index()); 163 constructor_args.push_long(Management::ticks_to_ms(gcStatInfo->start_time())); 164 constructor_args.push_long(Management::ticks_to_ms(gcStatInfo->end_time())); 165 constructor_args.push_oop(usage_before_gc_ah); 166 constructor_args.push_oop(usage_after_gc_ah); 167 constructor_args.push_oop(extra_array); 168 169 JavaCalls::call_special(&constructor_result, 170 gcInfoklass, 171 vmSymbols::object_initializer_name(), 172 vmSymbols::com_sun_management_GcInfo_constructor_signature(), 173 &constructor_args, 174 CHECK_NH); 175 176 return Handle(THREAD, gcInfo_instance()); 177 } 178 179 void GCNotifier::sendNotification(TRAPS) { 180 GCNotifier::sendNotificationInternal(THREAD); 181 // Clearing pending exception to avoid premature termination of 182 // the service thread 183 if (HAS_PENDING_EXCEPTION) { 184 CLEAR_PENDING_EXCEPTION; 185 } 186 } 187 188 class NotificationMark : public StackObj { 189 // This class is used in GCNotifier::sendNotificationInternal to ensure that 190 // the GCNotificationRequest object is properly cleaned up, whatever path 191 // is used to exit the method. 192 GCNotificationRequest* _request; 193 public: 194 NotificationMark(GCNotificationRequest* r) { 195 _request = r; 196 } 197 ~NotificationMark() { 198 assert(_request != NULL, "Sanity check"); 199 delete _request; 200 } 201 }; 202 203 void GCNotifier::sendNotificationInternal(TRAPS) { 204 ResourceMark rm(THREAD); 205 HandleMark hm(THREAD); 206 GCNotificationRequest *request = getRequest(); 207 if (request != NULL) { 208 NotificationMark nm(request); 209 Handle objGcInfo = createGcInfo(request->gcManager, request->gcStatInfo, CHECK); 210 211 Handle objName = java_lang_String::create_from_str(request->gcManager->name(), CHECK); 212 Handle objAction = java_lang_String::create_from_str(request->gcAction, CHECK); 213 Handle objCause = java_lang_String::create_from_str(request->gcCause, CHECK); 214 InstanceKlass* gc_mbean_klass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK); 215 216 instanceOop gc_mbean = request->gcManager->get_memory_manager_instance(THREAD); 217 instanceHandle gc_mbean_h(THREAD, gc_mbean); 218 if (!gc_mbean_h->is_a(gc_mbean_klass)) { 219 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 220 "This GCMemoryManager doesn't have a GarbageCollectorMXBean"); 221 } 222 223 JavaValue result(T_VOID); 224 JavaCallArguments args(gc_mbean_h); 225 args.push_long(request->timestamp); 226 args.push_oop(objName); 227 args.push_oop(objAction); 228 args.push_oop(objCause); 229 args.push_oop(objGcInfo); 230 231 JavaCalls::call_virtual(&result, 232 gc_mbean_klass, 233 vmSymbols::createGCNotification_name(), 234 vmSymbols::createGCNotification_signature(), 235 &args, 236 CHECK); 237 } 238 } 239