jdk8-mips64-public/hotspot: src/share/vm/services/memoryManager.cpp@1c63587d925b (annotated)

src/share/vm/services/memoryManager.cpp@1c63587d925b (annotated)

src/share/vm/services/memoryManager.cpp

Fri, 27 Aug 2010 13:34:14 -0400

author: tonyp
date: Fri, 27 Aug 2010 13:34:14 -0400
changeset 2112: 1c63587d925b
parent 2058: f6f3eef8a521
child 2314: f95d63e2154a
permissions: -rw-r--r--

6980206: G1: assert(has_undefined_max_size, "Undefined max size");
Summary: An assert in the management.cpp is too strong and assumes the max size is always defined on memory pools, even when we don't need to use it.
Reviewed-by: mchung, johnc

 /*
  * Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 # include "incls/_precompiled.incl"
 # include "incls/_memoryManager.cpp.incl"
 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int,
   size_t, size_t, size_t, size_t);
 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int,
   size_t, size_t, size_t, size_t);
 MemoryManager::MemoryManager() {
   _num_pools = 0;
   _memory_mgr_obj = NULL;
 }
 void MemoryManager::add_pool(MemoryPool* pool) {
   assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max");
   if (_num_pools < MemoryManager::max_num_pools) {
     _pools[_num_pools] = pool;
     _num_pools++;
   }
   pool->add_manager(this);
 }
 MemoryManager* MemoryManager::get_code_cache_memory_manager() {
   return (MemoryManager*) new CodeCacheMemoryManager();
 }
 GCMemoryManager* MemoryManager::get_copy_memory_manager() {
   return (GCMemoryManager*) new CopyMemoryManager();
 }
 GCMemoryManager* MemoryManager::get_msc_memory_manager() {
   return (GCMemoryManager*) new MSCMemoryManager();
 }
 GCMemoryManager* MemoryManager::get_parnew_memory_manager() {
   return (GCMemoryManager*) new ParNewMemoryManager();
 }
 GCMemoryManager* MemoryManager::get_cms_memory_manager() {
   return (GCMemoryManager*) new CMSMemoryManager();
 }
 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() {
   return (GCMemoryManager*) new PSScavengeMemoryManager();
 }
 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() {
   return (GCMemoryManager*) new PSMarkSweepMemoryManager();
 }
 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() {
   return (GCMemoryManager*) new G1YoungGenMemoryManager();
 }
 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() {
   return (GCMemoryManager*) new G1OldGenMemoryManager();
 }
 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) {
   // Must do an acquire so as to force ordering of subsequent
   // loads from anything _memory_mgr_obj points to or implies.
   instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
   if (mgr_obj == NULL) {
     // It's ok for more than one thread to execute the code up to the locked region.
     // Extra manager instances will just be gc'ed.
     klassOop k = Management::sun_management_ManagementFactory_klass(CHECK_0);
     instanceKlassHandle ik(THREAD, k);
     Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
     JavaValue result(T_OBJECT);
     JavaCallArguments args;
     args.push_oop(mgr_name);    // Argument 1
     symbolHandle method_name;
     symbolHandle signature;
     if (is_gc_memory_manager()) {
       method_name = vmSymbolHandles::createGarbageCollector_name();
       signature = vmSymbolHandles::createGarbageCollector_signature();
       args.push_oop(Handle());      // Argument 2 (for future extension)
     } else {
       method_name = vmSymbolHandles::createMemoryManager_name();
       signature = vmSymbolHandles::createMemoryManager_signature();
     }
     JavaCalls::call_static(&result,
                            ik,
                            method_name,
                            signature,
                            &args,
                            CHECK_0);
     instanceOop m = (instanceOop) result.get_jobject();
     instanceHandle mgr(THREAD, m);
     {
       // Get lock before setting _memory_mgr_obj
       // since another thread may have created the instance
       MutexLocker ml(Management_lock);
       // Check if another thread has created the management object.  We reload
       // _memory_mgr_obj here because some other thread may have initialized
       // it while we were executing the code before the lock.
       //
       // The lock has done an acquire, so the load can't float above it, but
       // we need to do a load_acquire as above.
       mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
       if (mgr_obj != NULL) {
          return mgr_obj;
       }
       // Get the address of the object we created via call_special.
       mgr_obj = mgr();
       // Use store barrier to make sure the memory accesses associated
       // with creating the management object are visible before publishing
       // its address.  The unlock will publish the store to _memory_mgr_obj
       // because it does a release first.
       OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
     }
   }
   return mgr_obj;
 }
 void MemoryManager::oops_do(OopClosure* f) {
   f->do_oop((oop*) &_memory_mgr_obj);
 }
 GCStatInfo::GCStatInfo(int num_pools) {
   // initialize the arrays for memory usage
   _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools);
   _after_gc_usage_array  = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools);
   size_t len = num_pools * sizeof(MemoryUsage);
   memset(_before_gc_usage_array, 0, len);
   memset(_after_gc_usage_array, 0, len);
   _usage_array_size = num_pools;
 }
 GCStatInfo::~GCStatInfo() {
   FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array);
   FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array);
 }
 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
   MemoryUsage* gc_usage_array;
   if (before_gc) {
     gc_usage_array = _before_gc_usage_array;
   } else {
     gc_usage_array = _after_gc_usage_array;
   }
   gc_usage_array[pool_index] = usage;
 }
 void GCStatInfo::clear() {
   _index = 0;
   _start_time = 0L;
   _end_time = 0L;
   size_t len = _usage_array_size * sizeof(MemoryUsage);
   memset(_before_gc_usage_array, 0, len);
   memset(_after_gc_usage_array, 0, len);
 }
 GCMemoryManager::GCMemoryManager() : MemoryManager() {
   _num_collections = 0;
   _last_gc_stat = NULL;
   _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true);
   _current_gc_stat = NULL;
   _num_gc_threads = 1;
 }
 GCMemoryManager::~GCMemoryManager() {
   delete _last_gc_stat;
   delete _last_gc_lock;
   delete _current_gc_stat;
 }
 void GCMemoryManager::initialize_gc_stat_info() {
   assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
   _last_gc_stat = new GCStatInfo(MemoryService::num_memory_pools());
   _current_gc_stat = new GCStatInfo(MemoryService::num_memory_pools());
   // tracking concurrent collections we need two objects: one to update, and one to
   // hold the publicly available "last (completed) gc" information.
 }
 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
                                bool recordAccumulatedGCTime) {
   assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
   if (recordAccumulatedGCTime) {
     _accumulated_timer.start();
   }
   // _num_collections now increases in gc_end, to count completed collections
   if (recordGCBeginTime) {
     _current_gc_stat->set_index(_num_collections+1);
     _current_gc_stat->set_start_time(Management::timestamp());
   }
   if (recordPreGCUsage) {
     // Keep memory usage of all memory pools
     for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
       MemoryPool* pool = MemoryService::get_memory_pool(i);
       MemoryUsage usage = pool->get_memory_usage();
       _current_gc_stat->set_before_gc_usage(i, usage);
       HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
         name(), strlen(name()),
         pool->name(), strlen(pool->name()),
         usage.init_size(), usage.used(),
         usage.committed(), usage.max_size());
     }
   }
 }
 // A collector MUST, even if it does not complete for some reason,
 // make a TraceMemoryManagerStats object where countCollection is true,
 // to ensure the current gc stat is placed in _last_gc_stat.
 void GCMemoryManager::gc_end(bool recordPostGCUsage,
                              bool recordAccumulatedGCTime,
                              bool recordGCEndTime, bool countCollection) {
   if (recordAccumulatedGCTime) {
     _accumulated_timer.stop();
   }
   if (recordGCEndTime) {
     _current_gc_stat->set_end_time(Management::timestamp());
   }
   if (recordPostGCUsage) {
     int i;
     // keep the last gc statistics for all memory pools
     for (i = 0; i < MemoryService::num_memory_pools(); i++) {
       MemoryPool* pool = MemoryService::get_memory_pool(i);
       MemoryUsage usage = pool->get_memory_usage();
       HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
         name(), strlen(name()),
         pool->name(), strlen(pool->name()),
         usage.init_size(), usage.used(),
         usage.committed(), usage.max_size());
       _current_gc_stat->set_after_gc_usage(i, usage);
     }
     // Set last collection usage of the memory pools managed by this collector
     for (i = 0; i < num_memory_pools(); i++) {
       MemoryPool* pool = get_memory_pool(i);
       MemoryUsage usage = pool->get_memory_usage();
       // Compare with GC usage threshold
       pool->set_last_collection_usage(usage);
       LowMemoryDetector::detect_after_gc_memory(pool);
     }
   }
   if (countCollection) {
     _num_collections++;
     // alternately update two objects making one public when complete
     {
       MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
       GCStatInfo *tmp = _last_gc_stat;
       _last_gc_stat = _current_gc_stat;
       _current_gc_stat = tmp;
       // reset the current stat for diagnosability purposes
       _current_gc_stat->clear();
     }
   }
 }
 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) {
   MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
   if (_last_gc_stat->gc_index() != 0) {
     dest->set_index(_last_gc_stat->gc_index());
     dest->set_start_time(_last_gc_stat->start_time());
     dest->set_end_time(_last_gc_stat->end_time());
     assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(),
            "Must have same array size");
     size_t len = dest->usage_array_size() * sizeof(MemoryUsage);
     memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len);
     memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len);
   }
   return _last_gc_stat->gc_index();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/memoryManager.cpp@1c63587d925b (annotated)

src/share/vm/services/memoryManager.cpp