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 /*

  * Copyright (c) 2003, 2013, 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

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  */

 #include "precompiled.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "memory/metaspace.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 "utilities/macros.hpp"

 #include "utilities/globalDefinitions.hpp"

 MemoryPool::MemoryPool(const char* name,

                        PoolType type,

                        size_t init_size,

                        size_t max_size,

                        bool support_usage_threshold,

                        bool support_gc_threshold) {

   _name = name;

   _initial_size = init_size;

   _max_size = max_size;

   (void)const_cast<instanceOop&>(_memory_pool_obj = NULL);

   _available_for_allocation = true;

   _num_managers = 0;

   _type = type;

   // initialize the max and init size of collection usage

   _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size);

   _usage_sensor = NULL;

   _gc_usage_sensor = NULL;

   // usage threshold supports both high and low threshold

   _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold);

   // gc usage threshold supports only high threshold

   _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold);

 }

 void MemoryPool::add_manager(MemoryManager* mgr) {

   assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max");

   if (_num_managers < MemoryPool::max_num_managers) {

     _managers[_num_managers] = mgr;

     _num_managers++;

   }

 }

 // Returns an instanceHandle of a MemoryPool object.

 // It creates a MemoryPool instance when the first time

 // this function is called.

 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) {

   // Must do an acquire so as to force ordering of subsequent

   // loads from anything _memory_pool_obj points to or implies.

   instanceOop pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);

   if (pool_obj == NULL) {

     // It's ok for more than one thread to execute the code up to the locked region.

     // Extra pool instances will just be gc'ed.

     Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_NULL);

     instanceKlassHandle ik(THREAD, k);

     Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL);

     jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L);

     jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L);

     JavaValue result(T_OBJECT);

     JavaCallArguments args;

     args.push_oop(pool_name);           // Argument 1

     args.push_int((int) is_heap());     // Argument 2

     Symbol* method_name = vmSymbols::createMemoryPool_name();

     Symbol* signature = vmSymbols::createMemoryPool_signature();

     args.push_long(usage_threshold_value);    // Argument 3

     args.push_long(gc_usage_threshold_value); // Argument 4

     JavaCalls::call_static(&result,

                            ik,

                            method_name,

                            signature,

                            &args,

                            CHECK_NULL);

     instanceOop p = (instanceOop) result.get_jobject();

     instanceHandle pool(THREAD, p);

     {

       // Get lock since another thread may have create the instance

       MutexLocker ml(Management_lock);

       // Check if another thread has created the pool.  We reload

       // _memory_pool_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.

       pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);

       if (pool_obj != NULL) {

          return pool_obj;

       }

       // Get the address of the object we created via call_special.

       pool_obj = pool();

       // Use store barrier to make sure the memory accesses associated

       // with creating the pool are visible before publishing its address.

       // The unlock will publish the store to _memory_pool_obj because

       // it does a release first.

       OrderAccess::release_store_ptr(&_memory_pool_obj, pool_obj);

     }

   }

   return pool_obj;

 }

 inline static size_t get_max_value(size_t val1, size_t val2) {

     return (val1 > val2 ? val1 : val2);

 }

 void MemoryPool::record_peak_memory_usage() {

   // Caller in JDK is responsible for synchronization -

   // acquire the lock for this memory pool before calling VM

   MemoryUsage usage = get_memory_usage();

   size_t peak_used = get_max_value(usage.used(), _peak_usage.used());

   size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed());

   size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size());

   _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size);

 }

 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) {

   assert(*sensor_ptr == NULL, "Should be called only once");

   SensorInfo* sensor = new SensorInfo();

   sensor->set_sensor(sh());

   *sensor_ptr = sensor;

 }

 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) {

   set_sensor_obj_at(&_usage_sensor, sh);

 }

 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) {

   set_sensor_obj_at(&_gc_usage_sensor, sh);

 }

 void MemoryPool::oops_do(OopClosure* f) {

   f->do_oop((oop*) &_memory_pool_obj);

   if (_usage_sensor != NULL) {

     _usage_sensor->oops_do(f);

   }

   if (_gc_usage_sensor != NULL) {

     _gc_usage_sensor->oops_do(f);

   }

 }

 ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space,

                                          const char* name,

                                          PoolType type,

                                          size_t max_size,

                                          bool support_usage_threshold) :

   CollectedMemoryPool(name, type, space->capacity(), max_size,

                       support_usage_threshold), _space(space) {

 }

 MemoryUsage ContiguousSpacePool::get_memory_usage() {

   size_t maxSize   = (available_for_allocation() ? max_size() : 0);

   size_t used      = used_in_bytes();

   size_t committed = _space->capacity();

   return MemoryUsage(initial_size(), used, committed, maxSize);

 }

 SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* gen,

                                                          const char* name,

                                                          PoolType type,

                                                          size_t max_size,

                                                          bool support_usage_threshold) :

   CollectedMemoryPool(name, type, gen->from()->capacity(), max_size,

                       support_usage_threshold), _gen(gen) {

 }

 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() {

   size_t maxSize = (available_for_allocation() ? max_size() : 0);

   size_t used    = used_in_bytes();

   size_t committed = committed_in_bytes();

   return MemoryUsage(initial_size(), used, committed, maxSize);

 }

 #if INCLUDE_ALL_GCS

 CompactibleFreeListSpacePool::CompactibleFreeListSpacePool(CompactibleFreeListSpace* space,

                                                            const char* name,

                                                            PoolType type,

                                                            size_t max_size,

                                                            bool support_usage_threshold) :

   CollectedMemoryPool(name, type, space->capacity(), max_size,

                       support_usage_threshold), _space(space) {

 }

 MemoryUsage CompactibleFreeListSpacePool::get_memory_usage() {

   size_t maxSize   = (available_for_allocation() ? max_size() : 0);

   size_t used      = used_in_bytes();

   size_t committed = _space->capacity();

   return MemoryUsage(initial_size(), used, committed, maxSize);

 }

 #endif // INCLUDE_ALL_GCS

 GenerationPool::GenerationPool(Generation* gen,

                                const char* name,

                                PoolType type,

                                bool support_usage_threshold) :

   CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(),

                       support_usage_threshold), _gen(gen) {

 }

 MemoryUsage GenerationPool::get_memory_usage() {

   size_t used      = used_in_bytes();

   size_t committed = _gen->capacity();

   size_t maxSize   = (available_for_allocation() ? max_size() : 0);

   return MemoryUsage(initial_size(), used, committed, maxSize);

 }

 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) :

   MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(),

              support_usage_threshold, false), _codeHeap(codeHeap) {

 }

 MemoryUsage CodeHeapPool::get_memory_usage() {

   size_t used      = used_in_bytes();

   size_t committed = _codeHeap->capacity();

   size_t maxSize   = (available_for_allocation() ? max_size() : 0);

   return MemoryUsage(initial_size(), used, committed, maxSize);

 }

 MetaspacePool::MetaspacePool() :

   MemoryPool("Metaspace", NonHeap, 0, calculate_max_size(), true, false) { }

 MemoryUsage MetaspacePool::get_memory_usage() {

   size_t committed = MetaspaceAux::committed_bytes();

   return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size());

 }

 size_t MetaspacePool::used_in_bytes() {

   return MetaspaceAux::allocated_used_bytes();

 }

 size_t MetaspacePool::calculate_max_size() const {

   return FLAG_IS_CMDLINE(MaxMetaspaceSize) ? MaxMetaspaceSize :

                                              MemoryUsage::undefined_size();

 }

 CompressedKlassSpacePool::CompressedKlassSpacePool() :

   MemoryPool("Compressed Class Space", NonHeap, 0, CompressedClassSpaceSize, true, false) { }

 size_t CompressedKlassSpacePool::used_in_bytes() {

   return MetaspaceAux::allocated_used_bytes(Metaspace::ClassType);

 }

 MemoryUsage CompressedKlassSpacePool::get_memory_usage() {

   size_t committed = MetaspaceAux::committed_bytes(Metaspace::ClassType);

   return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size());

 }