Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2003, 2010, 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 "precompiled.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/javaCalls.hpp"

 #include "services/lowMemoryDetector.hpp"

 #include "services/management.hpp"

 #include "services/memoryManager.hpp"

 #include "services/memoryPool.hpp"

 #include "services/memoryService.hpp"

 #include "utilities/dtrace.hpp"

 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

     Symbol* method_name = NULL;

     Symbol* signature = NULL;

     if (is_gc_memory_manager()) {

       method_name = vmSymbols::createGarbageCollector_name();

       signature = vmSymbols::createGarbageCollector_signature();

       args.push_oop(Handle());      // Argument 2 (for future extension)

     } else {

       method_name = vmSymbols::createMemoryManager_name();

       signature = vmSymbols::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();

 }