1 /* 2 * Copyright (c) 2003, 2005, 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 "incls/_precompiled.incl" 26 # include "incls/_memoryManager.cpp.incl" 27 28 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int, 29 size_t, size_t, size_t, size_t); 30 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int, 31 size_t, size_t, size_t, size_t); 32 33 MemoryManager::MemoryManager() { 34 _num_pools = 0; 35 _memory_mgr_obj = NULL; 36 } 37 38 void MemoryManager::add_pool(MemoryPool* pool) { 39 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max"); 40 if (_num_pools < MemoryManager::max_num_pools) { 41 _pools[_num_pools] = pool; 42 _num_pools++; 43 } 44 pool->add_manager(this); 45 } 46 47 MemoryManager* MemoryManager::get_code_cache_memory_manager() { 48 return (MemoryManager*) new CodeCacheMemoryManager(); 49 } 50 51 GCMemoryManager* MemoryManager::get_copy_memory_manager() { 52 return (GCMemoryManager*) new CopyMemoryManager(); 53 } 54 55 GCMemoryManager* MemoryManager::get_msc_memory_manager() { 56 return (GCMemoryManager*) new MSCMemoryManager(); 57 } 58 59 GCMemoryManager* MemoryManager::get_parnew_memory_manager() { 60 return (GCMemoryManager*) new ParNewMemoryManager(); 61 } 62 63 GCMemoryManager* MemoryManager::get_cms_memory_manager() { 64 return (GCMemoryManager*) new CMSMemoryManager(); 65 } 66 67 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() { 68 return (GCMemoryManager*) new PSScavengeMemoryManager(); 69 } 70 71 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() { 72 return (GCMemoryManager*) new PSMarkSweepMemoryManager(); 73 } 74 75 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() { 76 return (GCMemoryManager*) new G1YoungGenMemoryManager(); 77 } 78 79 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() { 80 return (GCMemoryManager*) new G1OldGenMemoryManager(); 81 } 82 83 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) { 84 // Must do an acquire so as to force ordering of subsequent 85 // loads from anything _memory_mgr_obj points to or implies. 86 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); 87 if (mgr_obj == NULL) { 88 // It's ok for more than one thread to execute the code up to the locked region. 89 // Extra manager instances will just be gc'ed. 90 klassOop k = Management::sun_management_ManagementFactory_klass(CHECK_0); 91 instanceKlassHandle ik(THREAD, k); 92 93 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0); 94 95 JavaValue result(T_OBJECT); 96 JavaCallArguments args; 97 args.push_oop(mgr_name); // Argument 1 98 99 symbolHandle method_name; 100 symbolHandle signature; 101 if (is_gc_memory_manager()) { 102 method_name = vmSymbolHandles::createGarbageCollector_name(); 103 signature = vmSymbolHandles::createGarbageCollector_signature(); 104 args.push_oop(Handle()); // Argument 2 (for future extension) 105 } else { 106 method_name = vmSymbolHandles::createMemoryManager_name(); 107 signature = vmSymbolHandles::createMemoryManager_signature(); 108 } 109 110 JavaCalls::call_static(&result, 111 ik, 112 method_name, 113 signature, 114 &args, 115 CHECK_0); 116 117 instanceOop m = (instanceOop) result.get_jobject(); 118 instanceHandle mgr(THREAD, m); 119 120 { 121 // Get lock before setting _memory_mgr_obj 122 // since another thread may have created the instance 123 MutexLocker ml(Management_lock); 124 125 // Check if another thread has created the management object. We reload 126 // _memory_mgr_obj here because some other thread may have initialized 127 // it while we were executing the code before the lock. 128 // 129 // The lock has done an acquire, so the load can't float above it, but 130 // we need to do a load_acquire as above. 131 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); 132 if (mgr_obj != NULL) { 133 return mgr_obj; 134 } 135 136 // Get the address of the object we created via call_special. 137 mgr_obj = mgr(); 138 139 // Use store barrier to make sure the memory accesses associated 140 // with creating the management object are visible before publishing 141 // its address. The unlock will publish the store to _memory_mgr_obj 142 // because it does a release first. 143 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj); 144 } 145 } 146 147 return mgr_obj; 148 } 149 150 void MemoryManager::oops_do(OopClosure* f) { 151 f->do_oop((oop*) &_memory_mgr_obj); 152 } 153 154 GCStatInfo::GCStatInfo(int num_pools) { 155 // initialize the arrays for memory usage 156 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); 157 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); 158 size_t len = num_pools * sizeof(MemoryUsage); 159 memset(_before_gc_usage_array, 0, len); 160 memset(_after_gc_usage_array, 0, len); 161 _usage_array_size = num_pools; 162 } 163 164 GCStatInfo::~GCStatInfo() { 165 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array); 166 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array); 167 } 168 169 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { 170 MemoryUsage* gc_usage_array; 171 if (before_gc) { 172 gc_usage_array = _before_gc_usage_array; 173 } else { 174 gc_usage_array = _after_gc_usage_array; 175 } 176 gc_usage_array[pool_index] = usage; 177 } 178 179 void GCStatInfo::clear() { 180 _index = 0; 181 _start_time = 0L; 182 _end_time = 0L; 183 size_t len = _usage_array_size * sizeof(MemoryUsage); 184 memset(_before_gc_usage_array, 0, len); 185 memset(_after_gc_usage_array, 0, len); 186 } 187 188 189 GCMemoryManager::GCMemoryManager() : MemoryManager() { 190 _num_collections = 0; 191 _last_gc_stat = NULL; 192 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true); 193 _current_gc_stat = NULL; 194 _num_gc_threads = 1; 195 } 196 197 GCMemoryManager::~GCMemoryManager() { 198 delete _last_gc_stat; 199 delete _last_gc_lock; 200 delete _current_gc_stat; 201 } 202 203 void GCMemoryManager::initialize_gc_stat_info() { 204 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); 205 _last_gc_stat = new GCStatInfo(MemoryService::num_memory_pools()); 206 _current_gc_stat = new GCStatInfo(MemoryService::num_memory_pools()); 207 // tracking concurrent collections we need two objects: one to update, and one to 208 // hold the publicly available "last (completed) gc" information. 209 } 210 211 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 212 bool recordAccumulatedGCTime) { 213 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking"); 214 if (recordAccumulatedGCTime) { 215 _accumulated_timer.start(); 216 } 217 // _num_collections now increases in gc_end, to count completed collections 218 if (recordGCBeginTime) { 219 _current_gc_stat->set_index(_num_collections+1); 220 _current_gc_stat->set_start_time(Management::timestamp()); 221 } 222 223 if (recordPreGCUsage) { 224 // Keep memory usage of all memory pools 225 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 226 MemoryPool* pool = MemoryService::get_memory_pool(i); 227 MemoryUsage usage = pool->get_memory_usage(); 228 _current_gc_stat->set_before_gc_usage(i, usage); 229 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin, 230 name(), strlen(name()), 231 pool->name(), strlen(pool->name()), 232 usage.init_size(), usage.used(), 233 usage.committed(), usage.max_size()); 234 } 235 } 236 } 237 238 // A collector MUST, even if it does not complete for some reason, 239 // make a TraceMemoryManagerStats object where countCollection is true, 240 // to ensure the current gc stat is placed in _last_gc_stat. 241 void GCMemoryManager::gc_end(bool recordPostGCUsage, 242 bool recordAccumulatedGCTime, 243 bool recordGCEndTime, bool countCollection) { 244 if (recordAccumulatedGCTime) { 245 _accumulated_timer.stop(); 246 } 247 if (recordGCEndTime) { 248 _current_gc_stat->set_end_time(Management::timestamp()); 249 } 250 251 if (recordPostGCUsage) { 252 int i; 253 // keep the last gc statistics for all memory pools 254 for (i = 0; i < MemoryService::num_memory_pools(); i++) { 255 MemoryPool* pool = MemoryService::get_memory_pool(i); 256 MemoryUsage usage = pool->get_memory_usage(); 257 258 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end, 259 name(), strlen(name()), 260 pool->name(), strlen(pool->name()), 261 usage.init_size(), usage.used(), 262 usage.committed(), usage.max_size()); 263 264 _current_gc_stat->set_after_gc_usage(i, usage); 265 } 266 267 // Set last collection usage of the memory pools managed by this collector 268 for (i = 0; i < num_memory_pools(); i++) { 269 MemoryPool* pool = get_memory_pool(i); 270 MemoryUsage usage = pool->get_memory_usage(); 271 272 // Compare with GC usage threshold 273 pool->set_last_collection_usage(usage); 274 LowMemoryDetector::detect_after_gc_memory(pool); 275 } 276 } 277 if (countCollection) { 278 _num_collections++; 279 // alternately update two objects making one public when complete 280 { 281 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 282 GCStatInfo *tmp = _last_gc_stat; 283 _last_gc_stat = _current_gc_stat; 284 _current_gc_stat = tmp; 285 // reset the current stat for diagnosability purposes 286 _current_gc_stat->clear(); 287 } 288 } 289 } 290 291 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) { 292 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 293 if (_last_gc_stat->gc_index() != 0) { 294 dest->set_index(_last_gc_stat->gc_index()); 295 dest->set_start_time(_last_gc_stat->start_time()); 296 dest->set_end_time(_last_gc_stat->end_time()); 297 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(), 298 "Must have same array size"); 299 size_t len = dest->usage_array_size() * sizeof(MemoryUsage); 300 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len); 301 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len); 302 } 303 return _last_gc_stat->gc_index(); 304 }