annotate hotspot/src/share/vm/services/memoryManager.cpp @ 18444:8adb4bc92f18

8013590: NPG: Add a memory pool MXBean for Metaspace Reviewed-by: jmasa, mgerdin
author ehelin
date Wed, 26 Jun 2013 16:58:37 +0200
parents 6009860b0b1e
children 7f9cbdf89af2
rev   line source
duke@1 1 /*
coleenp@13728 2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
duke@1 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1 4 *
duke@1 5 * This code is free software; you can redistribute it and/or modify it
duke@1 6 * under the terms of the GNU General Public License version 2 only, as
duke@1 7 * published by the Free Software Foundation.
duke@1 8 *
duke@1 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@1 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@1 13 * accompanied this code).
duke@1 14 *
duke@1 15 * You should have received a copy of the GNU General Public License version
duke@1 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@1 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1 18 *
trims@5547 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@5547 20 * or visit www.oracle.com if you need additional information or have any
trims@5547 21 * questions.
duke@1 22 *
duke@1 23 */
duke@1 24
stefank@7397 25 #include "precompiled.hpp"
stefank@7397 26 #include "classfile/systemDictionary.hpp"
stefank@7397 27 #include "classfile/vmSymbols.hpp"
stefank@7397 28 #include "oops/oop.inline.hpp"
stefank@7397 29 #include "runtime/handles.inline.hpp"
stefank@7397 30 #include "runtime/javaCalls.hpp"
stefank@7397 31 #include "services/lowMemoryDetector.hpp"
stefank@7397 32 #include "services/management.hpp"
stefank@7397 33 #include "services/memoryManager.hpp"
stefank@7397 34 #include "services/memoryPool.hpp"
stefank@7397 35 #include "services/memoryService.hpp"
fparain@9623 36 #include "services/gcNotifier.hpp"
stefank@7397 37 #include "utilities/dtrace.hpp"
duke@1 38
dcubed@10739 39 #ifndef USDT2
duke@1 40 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int,
duke@1 41 size_t, size_t, size_t, size_t);
duke@1 42 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int,
duke@1 43 size_t, size_t, size_t, size_t);
dcubed@10739 44 #endif /* !USDT2 */
duke@1 45
duke@1 46 MemoryManager::MemoryManager() {
duke@1 47 _num_pools = 0;
duke@1 48 _memory_mgr_obj = NULL;
duke@1 49 }
duke@1 50
duke@1 51 void MemoryManager::add_pool(MemoryPool* pool) {
duke@1 52 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max");
duke@1 53 if (_num_pools < MemoryManager::max_num_pools) {
duke@1 54 _pools[_num_pools] = pool;
duke@1 55 _num_pools++;
duke@1 56 }
duke@1 57 pool->add_manager(this);
duke@1 58 }
duke@1 59
duke@1 60 MemoryManager* MemoryManager::get_code_cache_memory_manager() {
duke@1 61 return (MemoryManager*) new CodeCacheMemoryManager();
duke@1 62 }
duke@1 63
ehelin@18444 64 MemoryManager* MemoryManager::get_metaspace_memory_manager() {
ehelin@18444 65 return (MemoryManager*) new MetaspaceMemoryManager();
ehelin@18444 66 }
ehelin@18444 67
duke@1 68 GCMemoryManager* MemoryManager::get_copy_memory_manager() {
duke@1 69 return (GCMemoryManager*) new CopyMemoryManager();
duke@1 70 }
duke@1 71
duke@1 72 GCMemoryManager* MemoryManager::get_msc_memory_manager() {
duke@1 73 return (GCMemoryManager*) new MSCMemoryManager();
duke@1 74 }
duke@1 75
duke@1 76 GCMemoryManager* MemoryManager::get_parnew_memory_manager() {
duke@1 77 return (GCMemoryManager*) new ParNewMemoryManager();
duke@1 78 }
duke@1 79
duke@1 80 GCMemoryManager* MemoryManager::get_cms_memory_manager() {
duke@1 81 return (GCMemoryManager*) new CMSMemoryManager();
duke@1 82 }
duke@1 83
duke@1 84 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() {
duke@1 85 return (GCMemoryManager*) new PSScavengeMemoryManager();
duke@1 86 }
duke@1 87
duke@1 88 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() {
duke@1 89 return (GCMemoryManager*) new PSMarkSweepMemoryManager();
duke@1 90 }
duke@1 91
tonyp@4459 92 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() {
tonyp@4459 93 return (GCMemoryManager*) new G1YoungGenMemoryManager();
tonyp@4459 94 }
tonyp@4459 95
tonyp@4459 96 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() {
tonyp@4459 97 return (GCMemoryManager*) new G1OldGenMemoryManager();
tonyp@4459 98 }
tonyp@4459 99
duke@1 100 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) {
duke@1 101 // Must do an acquire so as to force ordering of subsequent
duke@1 102 // loads from anything _memory_mgr_obj points to or implies.
duke@1 103 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
duke@1 104 if (mgr_obj == NULL) {
duke@1 105 // It's ok for more than one thread to execute the code up to the locked region.
duke@1 106 // Extra manager instances will just be gc'ed.
coleenp@13728 107 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_0);
duke@1 108 instanceKlassHandle ik(THREAD, k);
duke@1 109
duke@1 110 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
duke@1 111
duke@1 112 JavaValue result(T_OBJECT);
duke@1 113 JavaCallArguments args;
duke@1 114 args.push_oop(mgr_name); // Argument 1
duke@1 115
coleenp@8076 116 Symbol* method_name = NULL;
coleenp@8076 117 Symbol* signature = NULL;
duke@1 118 if (is_gc_memory_manager()) {
coleenp@8076 119 method_name = vmSymbols::createGarbageCollector_name();
coleenp@8076 120 signature = vmSymbols::createGarbageCollector_signature();
duke@1 121 args.push_oop(Handle()); // Argument 2 (for future extension)
duke@1 122 } else {
coleenp@8076 123 method_name = vmSymbols::createMemoryManager_name();
coleenp@8076 124 signature = vmSymbols::createMemoryManager_signature();
duke@1 125 }
duke@1 126
duke@1 127 JavaCalls::call_static(&result,
duke@1 128 ik,
duke@1 129 method_name,
duke@1 130 signature,
duke@1 131 &args,
duke@1 132 CHECK_0);
duke@1 133
duke@1 134 instanceOop m = (instanceOop) result.get_jobject();
duke@1 135 instanceHandle mgr(THREAD, m);
duke@1 136
duke@1 137 {
duke@1 138 // Get lock before setting _memory_mgr_obj
duke@1 139 // since another thread may have created the instance
duke@1 140 MutexLocker ml(Management_lock);
duke@1 141
duke@1 142 // Check if another thread has created the management object. We reload
duke@1 143 // _memory_mgr_obj here because some other thread may have initialized
duke@1 144 // it while we were executing the code before the lock.
duke@1 145 //
duke@1 146 // The lock has done an acquire, so the load can't float above it, but
duke@1 147 // we need to do a load_acquire as above.
duke@1 148 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
duke@1 149 if (mgr_obj != NULL) {
duke@1 150 return mgr_obj;
duke@1 151 }
duke@1 152
duke@1 153 // Get the address of the object we created via call_special.
duke@1 154 mgr_obj = mgr();
duke@1 155
duke@1 156 // Use store barrier to make sure the memory accesses associated
duke@1 157 // with creating the management object are visible before publishing
duke@1 158 // its address. The unlock will publish the store to _memory_mgr_obj
duke@1 159 // because it does a release first.
duke@1 160 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
duke@1 161 }
duke@1 162 }
duke@1 163
duke@1 164 return mgr_obj;
duke@1 165 }
duke@1 166
duke@1 167 void MemoryManager::oops_do(OopClosure* f) {
duke@1 168 f->do_oop((oop*) &_memory_mgr_obj);
duke@1 169 }
duke@1 170
duke@1 171 GCStatInfo::GCStatInfo(int num_pools) {
duke@1 172 // initialize the arrays for memory usage
zgu@13195 173 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
zgu@13195 174 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
duke@1 175 _usage_array_size = num_pools;
johnc@11171 176 clear();
duke@1 177 }
duke@1 178
duke@1 179 GCStatInfo::~GCStatInfo() {
zgu@13195 180 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array, mtInternal);
zgu@13195 181 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array, mtInternal);
duke@1 182 }
duke@1 183
duke@1 184 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
duke@1 185 MemoryUsage* gc_usage_array;
duke@1 186 if (before_gc) {
duke@1 187 gc_usage_array = _before_gc_usage_array;
duke@1 188 } else {
duke@1 189 gc_usage_array = _after_gc_usage_array;
duke@1 190 }
duke@1 191 gc_usage_array[pool_index] = usage;
duke@1 192 }
duke@1 193
kevinw@6245 194 void GCStatInfo::clear() {
kevinw@6245 195 _index = 0;
kevinw@6245 196 _start_time = 0L;
kevinw@6245 197 _end_time = 0L;
kevinw@6245 198 size_t len = _usage_array_size * sizeof(MemoryUsage);
kevinw@6245 199 memset(_before_gc_usage_array, 0, len);
kevinw@6245 200 memset(_after_gc_usage_array, 0, len);
kevinw@6245 201 }
kevinw@6245 202
kevinw@6245 203
duke@1 204 GCMemoryManager::GCMemoryManager() : MemoryManager() {
duke@1 205 _num_collections = 0;
duke@1 206 _last_gc_stat = NULL;
kevinw@6245 207 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true);
kevinw@6245 208 _current_gc_stat = NULL;
duke@1 209 _num_gc_threads = 1;
fparain@9623 210 _notification_enabled = false;
duke@1 211 }
duke@1 212
duke@1 213 GCMemoryManager::~GCMemoryManager() {
duke@1 214 delete _last_gc_stat;
kevinw@6245 215 delete _last_gc_lock;
kevinw@6245 216 delete _current_gc_stat;
duke@1 217 }
duke@1 218
duke@1 219 void GCMemoryManager::initialize_gc_stat_info() {
duke@1 220 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
zgu@13195 221 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
zgu@13195 222 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
kevinw@6245 223 // tracking concurrent collections we need two objects: one to update, and one to
kevinw@6245 224 // hold the publicly available "last (completed) gc" information.
duke@1 225 }
duke@1 226
kevinw@6245 227 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
kevinw@6245 228 bool recordAccumulatedGCTime) {
kevinw@6245 229 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
kevinw@6245 230 if (recordAccumulatedGCTime) {
kevinw@6245 231 _accumulated_timer.start();
kevinw@6245 232 }
kevinw@6245 233 // _num_collections now increases in gc_end, to count completed collections
kevinw@6245 234 if (recordGCBeginTime) {
kevinw@6245 235 _current_gc_stat->set_index(_num_collections+1);
kevinw@6245 236 _current_gc_stat->set_start_time(Management::timestamp());
kevinw@6245 237 }
duke@1 238
kevinw@6245 239 if (recordPreGCUsage) {
kevinw@6245 240 // Keep memory usage of all memory pools
kevinw@6245 241 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
kevinw@6245 242 MemoryPool* pool = MemoryService::get_memory_pool(i);
kevinw@6245 243 MemoryUsage usage = pool->get_memory_usage();
kevinw@6245 244 _current_gc_stat->set_before_gc_usage(i, usage);
dcubed@10739 245 #ifndef USDT2
kevinw@6245 246 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
kevinw@6245 247 name(), strlen(name()),
kevinw@6245 248 pool->name(), strlen(pool->name()),
kevinw@6245 249 usage.init_size(), usage.used(),
kevinw@6245 250 usage.committed(), usage.max_size());
dcubed@10739 251 #else /* USDT2 */
dcubed@10739 252 HOTSPOT_MEM_POOL_GC_BEGIN(
dcubed@10739 253 (char *) name(), strlen(name()),
dcubed@10739 254 (char *) pool->name(), strlen(pool->name()),
dcubed@10739 255 usage.init_size(), usage.used(),
dcubed@10739 256 usage.committed(), usage.max_size());
dcubed@10739 257 #endif /* USDT2 */
kevinw@6245 258 }
duke@1 259 }
duke@1 260 }
duke@1 261
kevinw@6245 262 // A collector MUST, even if it does not complete for some reason,
kevinw@6245 263 // make a TraceMemoryManagerStats object where countCollection is true,
kevinw@6245 264 // to ensure the current gc stat is placed in _last_gc_stat.
kevinw@6245 265 void GCMemoryManager::gc_end(bool recordPostGCUsage,
kevinw@6245 266 bool recordAccumulatedGCTime,
fparain@9623 267 bool recordGCEndTime, bool countCollection,
fparain@9623 268 GCCause::Cause cause) {
kevinw@6245 269 if (recordAccumulatedGCTime) {
kevinw@6245 270 _accumulated_timer.stop();
kevinw@6245 271 }
kevinw@6245 272 if (recordGCEndTime) {
kevinw@6245 273 _current_gc_stat->set_end_time(Management::timestamp());
duke@1 274 }
duke@1 275
kevinw@6245 276 if (recordPostGCUsage) {
kevinw@6245 277 int i;
kevinw@6245 278 // keep the last gc statistics for all memory pools
kevinw@6245 279 for (i = 0; i < MemoryService::num_memory_pools(); i++) {
kevinw@6245 280 MemoryPool* pool = MemoryService::get_memory_pool(i);
kevinw@6245 281 MemoryUsage usage = pool->get_memory_usage();
duke@1 282
dcubed@10739 283 #ifndef USDT2
kevinw@6245 284 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
kevinw@6245 285 name(), strlen(name()),
kevinw@6245 286 pool->name(), strlen(pool->name()),
kevinw@6245 287 usage.init_size(), usage.used(),
kevinw@6245 288 usage.committed(), usage.max_size());
dcubed@10739 289 #else /* USDT2 */
dcubed@10739 290 HOTSPOT_MEM_POOL_GC_END(
dcubed@10739 291 (char *) name(), strlen(name()),
dcubed@10739 292 (char *) pool->name(), strlen(pool->name()),
dcubed@10739 293 usage.init_size(), usage.used(),
dcubed@10739 294 usage.committed(), usage.max_size());
dcubed@10739 295 #endif /* USDT2 */
kevinw@6245 296
kevinw@6245 297 _current_gc_stat->set_after_gc_usage(i, usage);
kevinw@6245 298 }
kevinw@6245 299
kevinw@6245 300 // Set last collection usage of the memory pools managed by this collector
kevinw@6245 301 for (i = 0; i < num_memory_pools(); i++) {
kevinw@6245 302 MemoryPool* pool = get_memory_pool(i);
kevinw@6245 303 MemoryUsage usage = pool->get_memory_usage();
kevinw@6245 304
kevinw@6245 305 // Compare with GC usage threshold
kevinw@6245 306 pool->set_last_collection_usage(usage);
kevinw@6245 307 LowMemoryDetector::detect_after_gc_memory(pool);
kevinw@6245 308 }
kevinw@6245 309 }
johnc@11171 310
kevinw@6245 311 if (countCollection) {
kevinw@6245 312 _num_collections++;
kevinw@6245 313 // alternately update two objects making one public when complete
kevinw@6245 314 {
kevinw@6245 315 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
kevinw@6245 316 GCStatInfo *tmp = _last_gc_stat;
kevinw@6245 317 _last_gc_stat = _current_gc_stat;
kevinw@6245 318 _current_gc_stat = tmp;
kevinw@6245 319 // reset the current stat for diagnosability purposes
kevinw@6245 320 _current_gc_stat->clear();
kevinw@6245 321 }
johnc@11171 322
johnc@11171 323 if (is_notification_enabled()) {
johnc@11171 324 bool isMajorGC = this == MemoryService::get_major_gc_manager();
johnc@11171 325 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC",
johnc@11171 326 GCCause::to_string(cause));
johnc@11171 327 }
duke@1 328 }
duke@1 329 }
kevinw@6245 330
kevinw@6245 331 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) {
kevinw@6245 332 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
kevinw@6245 333 if (_last_gc_stat->gc_index() != 0) {
kevinw@6245 334 dest->set_index(_last_gc_stat->gc_index());
kevinw@6245 335 dest->set_start_time(_last_gc_stat->start_time());
kevinw@6245 336 dest->set_end_time(_last_gc_stat->end_time());
kevinw@6245 337 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(),
kevinw@6245 338 "Must have same array size");
kevinw@6245 339 size_t len = dest->usage_array_size() * sizeof(MemoryUsage);
kevinw@6245 340 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len);
kevinw@6245 341 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len);
kevinw@6245 342 }
kevinw@6245 343 return _last_gc_stat->gc_index();
kevinw@6245 344 }