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::copy_stat(GCStatInfo* stat) {
 170   set_index(stat->gc_index());
 171   set_start_time(stat->start_time());
 172   set_end_time(stat->end_time());
 173   assert(_usage_array_size == stat->usage_array_size(), "Must have same array size");
 174   for (int i = 0; i < _usage_array_size; i++) {
 175     set_before_gc_usage(i, stat->before_gc_usage_for_pool(i));
 176     set_after_gc_usage(i, stat->after_gc_usage_for_pool(i));
 177   }
 178 }
 179 
 180 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
 181   MemoryUsage* gc_usage_array;
 182   if (before_gc) {
 183     gc_usage_array = _before_gc_usage_array;
 184   } else {
 185     gc_usage_array = _after_gc_usage_array;
 186   }
 187   gc_usage_array[pool_index] = usage;
 188 }
 189 
 190 GCMemoryManager::GCMemoryManager() : MemoryManager() {
 191   _num_collections = 0;
 192   _last_gc_stat = NULL;
 193   _current_gc_stat = NULL;
 194   _num_gc_threads = 1;
 195 }
 196 
 197 GCMemoryManager::~GCMemoryManager() {
 198   delete _last_gc_stat;
 199   delete _current_gc_stat;
 200 }
 201 
 202 void GCMemoryManager::initialize_gc_stat_info() {
 203   assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
 204   _last_gc_stat = new GCStatInfo(MemoryService::num_memory_pools());
 205   _current_gc_stat = new GCStatInfo(MemoryService::num_memory_pools());
 206   // tracking concurrent collections requires two objects: one to update, and one to
 207   // be the publicly available "last (completed) gc".
 208 }
 209 
 210 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
 211                                bool recordAccumulatedGCTime) {
 212   assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
 213   if (recordAccumulatedGCTime) {
 214     _accumulated_timer.start();
 215   }
 216   // _num_collections now increases in gc_end, to count completed collections
 217   if (recordGCBeginTime) {
 218     _current_gc_stat->set_index(_num_collections+1);
 219     _current_gc_stat->set_start_time(Management::timestamp());
 220   }
 221 
 222   if (recordPreGCUsage) {
 223     // Keep memory usage of all memory pools
 224     for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
 225       MemoryPool* pool = MemoryService::get_memory_pool(i);
 226       MemoryUsage usage = pool->get_memory_usage();
 227       _current_gc_stat->set_before_gc_usage(i, usage);
 228       HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
 229         name(), strlen(name()),
 230         pool->name(), strlen(pool->name()),
 231         usage.init_size(), usage.used(),
 232         usage.committed(), usage.max_size());
 233     }
 234   }
 235 }
 236 
 237 // A collector MUST, even if it does not complete for some reason,
 238 // make a TraceMemoryManagerStats object where countCollection is true, 
 239 // to ensure the current gc stat is placed in _last_gc_stat.
 240 void GCMemoryManager::gc_end(bool recordPostGCUsage,
 241                              bool recordAccumulatedGCTime,
 242                              bool recordGCEndTime, bool countCollection) {
 243   if (recordAccumulatedGCTime) {
 244     _accumulated_timer.stop();
 245   }
 246   if (recordGCEndTime) {
 247     _current_gc_stat->set_end_time(Management::timestamp());
 248   }
 249 
 250   if (recordPostGCUsage) {
 251     int i;
 252     // keep the last gc statistics for all memory pools
 253     for (i = 0; i < MemoryService::num_memory_pools(); i++) {
 254       MemoryPool* pool = MemoryService::get_memory_pool(i);
 255       MemoryUsage usage = pool->get_memory_usage();
 256 
 257       HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
 258         name(), strlen(name()),
 259         pool->name(), strlen(pool->name()),
 260         usage.init_size(), usage.used(),
 261         usage.committed(), usage.max_size());
 262 
 263       _current_gc_stat->set_after_gc_usage(i, usage);
 264     }
 265 
 266     // Set last collection usage of the memory pools managed by this collector
 267     for (i = 0; i < num_memory_pools(); i++) {
 268       MemoryPool* pool = get_memory_pool(i);
 269       MemoryUsage usage = pool->get_memory_usage();
 270 
 271       // Compare with GC usage threshold
 272       pool->set_last_collection_usage(usage);
 273       LowMemoryDetector::detect_after_gc_memory(pool);
 274     }
 275   }
 276   if (countCollection) {
 277     _num_collections++;
 278     // alternately update two objects making one public when complete
 279     GCStatInfo *tmp = _last_gc_stat;
 280     _last_gc_stat = _current_gc_stat;
 281     _current_gc_stat = tmp;
 282 #ifdef ASSERT
 283     // reset the current stat for diagnosability purposes
 284     _current_gc_stat->set_index(0);
 285     _current_gc_stat->set_start_time(0);
 286     _current_gc_stat->set_end_time(0);
 287     for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
 288       MemoryUsage empty_usage = MemoryUsage();
 289       _current_gc_stat->set_before_gc_usage(i, empty_usage);
 290       _current_gc_stat->set_after_gc_usage(i, empty_usage);
 291     }
 292 #endif
 293   }
 294 }