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 /*

  * 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.

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  */

 #ifndef SHARE_VM_SERVICES_MEMORYPOOL_HPP

 #define SHARE_VM_SERVICES_MEMORYPOOL_HPP

 #include "gc_implementation/shared/mutableSpace.hpp"

 #include "memory/defNewGeneration.hpp"

 #include "memory/heap.hpp"

 #include "memory/space.hpp"

 #include "services/memoryUsage.hpp"

 #ifndef SERIALGC

 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"

 #endif

 // A memory pool represents the memory area that the VM manages.

 // The Java virtual machine has at least one memory pool

 // and it may create or remove memory pools during execution.

 // A memory pool can belong to the heap or the non-heap memory.

 // A Java virtual machine may also have memory pools belonging to

 // both heap and non-heap memory.

 // Forward declaration

 class MemoryManager;

 class SensorInfo;

 class Generation;

 class DefNewGeneration;

 class PSPermGen;

 class PermGen;

 class ThresholdSupport;

 class MemoryPool : public CHeapObj {

   friend class MemoryManager;

  public:

   enum PoolType {

     Heap    = 1,

     NonHeap = 2

   };

  private:

   enum {

     max_num_managers = 5

   };

   // We could make some of the following as performance counters

   // for external monitoring.

   const char*      _name;

   PoolType         _type;

   size_t           _initial_size;

   size_t           _max_size;

   bool             _available_for_allocation; // Default is true

   MemoryManager*   _managers[max_num_managers];

   int              _num_managers;

   MemoryUsage      _peak_usage;               // Peak memory usage

   MemoryUsage      _after_gc_usage;           // After GC memory usage

   ThresholdSupport* _usage_threshold;

   ThresholdSupport* _gc_usage_threshold;

   SensorInfo*      _usage_sensor;

   SensorInfo*      _gc_usage_sensor;

   volatile instanceOop _memory_pool_obj;

   void add_manager(MemoryManager* mgr);

  public:

   MemoryPool(const char* name,

              PoolType type,

              size_t init_size,

              size_t max_size,

              bool support_usage_threshold,

              bool support_gc_threshold);

   const char* name()                       { return _name; }

   bool        is_heap()                    { return _type == Heap; }

   bool        is_non_heap()                { return _type == NonHeap; }

   size_t      initial_size()   const       { return _initial_size; }

   int         num_memory_managers() const  { return _num_managers; }

   // max size could be changed

   virtual size_t max_size()    const       { return _max_size; }

   bool is_pool(instanceHandle pool) { return (pool() == _memory_pool_obj); }

   bool available_for_allocation()   { return _available_for_allocation; }

   bool set_available_for_allocation(bool value) {

     bool prev = _available_for_allocation;

     _available_for_allocation = value;

     return prev;

   }

   MemoryManager* get_memory_manager(int index) {

     assert(index >= 0 && index < _num_managers, "Invalid index");

     return _managers[index];

   }

   // Records current memory usage if it's a peak usage

   void record_peak_memory_usage();

   MemoryUsage get_peak_memory_usage() {

     // check current memory usage first and then return peak usage

     record_peak_memory_usage();

     return _peak_usage;

   }

   void        reset_peak_memory_usage() {

     _peak_usage = get_memory_usage();

   }

   ThresholdSupport* usage_threshold()      { return _usage_threshold; }

   ThresholdSupport* gc_usage_threshold()   { return _gc_usage_threshold; }

   SensorInfo*       usage_sensor()         {  return _usage_sensor; }

   SensorInfo*       gc_usage_sensor()      { return _gc_usage_sensor; }

   void        set_usage_sensor_obj(instanceHandle s);

   void        set_gc_usage_sensor_obj(instanceHandle s);

   void        set_last_collection_usage(MemoryUsage u)  { _after_gc_usage = u; }

   virtual instanceOop get_memory_pool_instance(TRAPS);

   virtual MemoryUsage get_memory_usage() = 0;

   virtual size_t      used_in_bytes() = 0;

   virtual bool        is_collected_pool()         { return false; }

   virtual MemoryUsage get_last_collection_usage() { return _after_gc_usage; }

   // GC support

   void oops_do(OopClosure* f);

 };

 class CollectedMemoryPool : public MemoryPool {

 public:

   CollectedMemoryPool(const char* name, PoolType type, size_t init_size, size_t max_size, bool support_usage_threshold) :

     MemoryPool(name, type, init_size, max_size, support_usage_threshold, true) {};

   bool is_collected_pool()            { return true; }

 };

 class ContiguousSpacePool : public CollectedMemoryPool {

 private:

   ContiguousSpace* _space;

 public:

   ContiguousSpacePool(ContiguousSpace* space, const char* name, PoolType type, size_t max_size, bool support_usage_threshold);

   ContiguousSpace* space()              { return _space; }

   MemoryUsage get_memory_usage();

   size_t used_in_bytes()                { return space()->used(); }

 };

 class SurvivorContiguousSpacePool : public CollectedMemoryPool {

 private:

   DefNewGeneration* _gen;

 public:

   SurvivorContiguousSpacePool(DefNewGeneration* gen,

                               const char* name,

                               PoolType type,

                               size_t max_size,

                               bool support_usage_threshold);

   MemoryUsage get_memory_usage();

   size_t used_in_bytes() {

     return _gen->from()->used();

   }

   size_t committed_in_bytes() {

     return _gen->from()->capacity();

   }

 };

 #ifndef SERIALGC

 class CompactibleFreeListSpacePool : public CollectedMemoryPool {

 private:

   CompactibleFreeListSpace* _space;

 public:

   CompactibleFreeListSpacePool(CompactibleFreeListSpace* space,

                                const char* name,

                                PoolType type,

                                size_t max_size,

                                bool support_usage_threshold);

   MemoryUsage get_memory_usage();

   size_t used_in_bytes()            { return _space->used(); }

 };

 #endif // SERIALGC

 class GenerationPool : public CollectedMemoryPool {

 private:

   Generation* _gen;

 public:

   GenerationPool(Generation* gen, const char* name, PoolType type, bool support_usage_threshold);

   MemoryUsage get_memory_usage();

   size_t used_in_bytes()                { return _gen->used(); }

 };

 class CodeHeapPool: public MemoryPool {

 private:

   CodeHeap* _codeHeap;

 public:

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

   MemoryUsage get_memory_usage();

   size_t used_in_bytes()            { return _codeHeap->allocated_capacity(); }

 };

 #endif // SHARE_VM_SERVICES_MEMORYPOOL_HPP