1 /* 2 * Copyright (c) 2011, 2019, 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/handles.inline.hpp" 31 #include "runtime/java.hpp" 32 #include "runtime/javaCalls.hpp" 33 #include "runtime/mutex.hpp" 34 #include "runtime/mutexLocker.hpp" 35 #include "services/gcNotifier.hpp" 36 #include "services/management.hpp" 37 #include "services/memoryService.hpp" 38 #include "memoryManager.hpp" 39 #include "memory/oopFactory.hpp" 40 #include "memory/resourceArea.hpp" 41 42 GCNotificationRequest *GCNotifier::first_request = NULL; 43 GCNotificationRequest *GCNotifier::last_request = NULL; 44 45 void GCNotifier::pushNotification(GCMemoryManager *mgr, const char *action, const char *cause) { 46 // Make a copy of the last GC statistics 47 // GC may occur between now and the creation of the notification 48 int num_pools = MemoryService::num_memory_pools(); 49 // stat is deallocated inside GCNotificationRequest 50 GCStatInfo* stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(num_pools); 51 mgr->get_last_gc_stat(stat); 52 GCNotificationRequest *request = new GCNotificationRequest(os::javaTimeMillis(),mgr,action,cause,stat); 53 addRequest(request); 54 } 55 56 void GCNotifier::addRequest(GCNotificationRequest *request) { 57 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag); 58 if(first_request == NULL) { 59 first_request = request; 60 } else { 61 last_request->next = request; 62 } 63 last_request = request; 64 Service_lock->notify_all(); 65 } 66 67 GCNotificationRequest *GCNotifier::getRequest() { 68 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag); 69 GCNotificationRequest *request = first_request; 70 if(first_request != NULL) { 71 first_request = first_request->next; 72 } 73 return request; 74 } 75 76 bool GCNotifier::has_event() { 77 return first_request != NULL; 78 } 79 80 static Handle getGcInfoBuilder(GCMemoryManager *gcManager,TRAPS) { 81 82 Klass* gcMBeanKlass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK_NH); 83 84 instanceOop i = gcManager->get_memory_manager_instance(THREAD); 85 instanceHandle ih(THREAD, i); 86 87 JavaValue result(T_OBJECT); 88 JavaCallArguments args(ih); 89 90 JavaCalls::call_virtual(&result, 91 gcMBeanKlass, 92 vmSymbols::getGcInfoBuilder_name(), 93 vmSymbols::getGcInfoBuilder_signature(), 94 &args, 95 CHECK_NH); 96 return Handle(THREAD,(oop)result.get_jobject()); 97 } 98 99 static Handle createGcInfo(GCMemoryManager *gcManager, GCStatInfo *gcStatInfo,TRAPS) { 100 101 // Fill the arrays of MemoryUsage objects with before and after GC 102 // per pool memory usage 103 104 InstanceKlass* mu_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_NH); 105 106 // The array allocations below should use a handle containing mu_klass 107 // as the first allocation could trigger a GC, causing the actual 108 // klass oop to move, and leaving mu_klass pointing to the old 109 // location. 110 objArrayOop bu = oopFactory::new_objArray(mu_klass, MemoryService::num_memory_pools(), CHECK_NH); 111 objArrayHandle usage_before_gc_ah(THREAD, bu); 112 objArrayOop au = oopFactory::new_objArray(mu_klass, MemoryService::num_memory_pools(), CHECK_NH); 113 objArrayHandle usage_after_gc_ah(THREAD, au); 114 115 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 116 Handle before_usage = MemoryService::create_MemoryUsage_obj(gcStatInfo->before_gc_usage_for_pool(i), CHECK_NH); 117 Handle after_usage; 118 119 MemoryUsage u = gcStatInfo->after_gc_usage_for_pool(i); 120 if (u.max_size() == 0 && u.used() > 0) { 121 // If max size == 0, this pool is a survivor space. 122 // Set max size = -1 since the pools will be swapped after GC. 123 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1); 124 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK_NH); 125 } else { 126 after_usage = MemoryService::create_MemoryUsage_obj(u, CHECK_NH); 127 } 128 usage_before_gc_ah->obj_at_put(i, before_usage()); 129 usage_after_gc_ah->obj_at_put(i, after_usage()); 130 } 131 132 // Current implementation only has 1 attribute (number of GC threads) 133 // The type is 'I' 134 objArrayOop extra_args_array = oopFactory::new_objArray(SystemDictionary::Integer_klass(), 1, CHECK_NH); 135 objArrayHandle extra_array (THREAD, extra_args_array); 136 137 JavaCallArguments argsInt; 138 argsInt.push_int(gcManager->num_gc_threads()); 139 Handle extra_arg_val = JavaCalls::construct_new_instance( 140 SystemDictionary::Integer_klass(), 141 vmSymbols::int_void_signature(), 142 &argsInt, 143 CHECK_NH); 144 145 extra_array->obj_at_put(0,extra_arg_val()); 146 147 InstanceKlass* gcInfoklass = Management::com_sun_management_GcInfo_klass(CHECK_NH); 148 149 JavaCallArguments constructor_args(16); 150 constructor_args.push_oop(getGcInfoBuilder(gcManager,THREAD)); 151 constructor_args.push_long(gcStatInfo->gc_index()); 152 constructor_args.push_long(Management::ticks_to_ms(gcStatInfo->start_time())); 153 constructor_args.push_long(Management::ticks_to_ms(gcStatInfo->end_time())); 154 constructor_args.push_oop(usage_before_gc_ah); 155 constructor_args.push_oop(usage_after_gc_ah); 156 constructor_args.push_oop(extra_array); 157 158 return JavaCalls::construct_new_instance( 159 gcInfoklass, 160 vmSymbols::com_sun_management_GcInfo_constructor_signature(), 161 &constructor_args, 162 CHECK_NH); 163 } 164 165 void GCNotifier::sendNotification(TRAPS) { 166 GCNotifier::sendNotificationInternal(THREAD); 167 // Clearing pending exception to avoid premature termination of 168 // the service thread 169 if (HAS_PENDING_EXCEPTION) { 170 CLEAR_PENDING_EXCEPTION; 171 } 172 } 173 174 class NotificationMark : public StackObj { 175 // This class is used in GCNotifier::sendNotificationInternal to ensure that 176 // the GCNotificationRequest object is properly cleaned up, whatever path 177 // is used to exit the method. 178 GCNotificationRequest* _request; 179 public: 180 NotificationMark(GCNotificationRequest* r) { 181 _request = r; 182 } 183 ~NotificationMark() { 184 assert(_request != NULL, "Sanity check"); 185 delete _request; 186 } 187 }; 188 189 void GCNotifier::sendNotificationInternal(TRAPS) { 190 ResourceMark rm(THREAD); 191 HandleMark hm(THREAD); 192 GCNotificationRequest *request = getRequest(); 193 if (request != NULL) { 194 NotificationMark nm(request); 195 Handle objGcInfo = createGcInfo(request->gcManager, request->gcStatInfo, CHECK); 196 197 Handle objName = java_lang_String::create_from_str(request->gcManager->name(), CHECK); 198 Handle objAction = java_lang_String::create_from_str(request->gcAction, CHECK); 199 Handle objCause = java_lang_String::create_from_str(request->gcCause, CHECK); 200 InstanceKlass* gc_mbean_klass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK); 201 202 instanceOop gc_mbean = request->gcManager->get_memory_manager_instance(THREAD); 203 instanceHandle gc_mbean_h(THREAD, gc_mbean); 204 if (!gc_mbean_h->is_a(gc_mbean_klass)) { 205 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 206 "This GCMemoryManager doesn't have a GarbageCollectorMXBean"); 207 } 208 209 JavaValue result(T_VOID); 210 JavaCallArguments args(gc_mbean_h); 211 args.push_long(request->timestamp); 212 args.push_oop(objName); 213 args.push_oop(objAction); 214 args.push_oop(objCause); 215 args.push_oop(objGcInfo); 216 217 JavaCalls::call_virtual(&result, 218 gc_mbean_klass, 219 vmSymbols::createGCNotification_name(), 220 vmSymbols::createGCNotification_signature(), 221 &args, 222 CHECK); 223 } 224 } 225