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 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * This code is free software; you can redistribute it and/or modify it

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  * 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.

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 #ifndef SHARE_VM_SERVICES_G1MEMORYPOOL_HPP

 #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP

 #include "utilities/macros.hpp"

 #if INCLUDE_ALL_GCS

 #include "gc_implementation/g1/g1MonitoringSupport.hpp"

 #include "services/memoryPool.hpp"

 #include "services/memoryUsage.hpp"

 #endif // INCLUDE_ALL_GCS

 // This file contains the three classes that represent the memory

 // pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and

 // G1OldGenPool. In G1, unlike our other GCs, we do not have a

 // physical space for each of those spaces. Instead, we allocate

 // regions for all three spaces out of a single pool of regions (that

 // pool basically covers the entire heap). As a result, the eden,

 // survivor, and old gen are considered logical spaces in G1, as each

 // is a set of non-contiguous regions. This is also reflected in the

 // way we map them to memory pools here. The easiest way to have done

 // this would have been to map the entire G1 heap to a single memory

 // pool. However, it's helpful to show how large the eden and survivor

 // get, as this does affect the performance and behavior of G1. Which

 // is why we introduce the three memory pools implemented here.

 //

 // See comments in g1MonitoringSupport.hpp for additional details

 // on this model.

 //

 // This class is shared by the three G1 memory pool classes

 // (G1EdenPool, G1SurvivorPool, G1OldGenPool).

 class G1MemoryPoolSuper : public CollectedMemoryPool {

 protected:

   const static size_t _undefined_max = (size_t) -1;

   G1MonitoringSupport* _g1mm;

   // Would only be called from subclasses.

   G1MemoryPoolSuper(G1CollectedHeap* g1h,

                     const char* name,

                     size_t init_size,

                     size_t max_size,

                     bool support_usage_threshold);

 };

 // Memory pool that represents the G1 eden.

 class G1EdenPool : public G1MemoryPoolSuper {

 public:

   G1EdenPool(G1CollectedHeap* g1h);

   size_t used_in_bytes() {

     return _g1mm->eden_space_used();

   }

   size_t max_size() const {

     return _undefined_max;

   }

   MemoryUsage get_memory_usage();

 };

 // Memory pool that represents the G1 survivor.

 class G1SurvivorPool : public G1MemoryPoolSuper {

 public:

   G1SurvivorPool(G1CollectedHeap* g1h);

   size_t used_in_bytes() {

     return _g1mm->survivor_space_used();

   }

   size_t max_size() const {

     return _undefined_max;

   }

   MemoryUsage get_memory_usage();

 };

 // Memory pool that represents the G1 old gen.

 class G1OldGenPool : public G1MemoryPoolSuper {

 public:

   G1OldGenPool(G1CollectedHeap* g1h);

   size_t used_in_bytes() {

     return _g1mm->old_space_used();

   }

   size_t max_size() const {

     return _g1mm->old_gen_max();

   }

   MemoryUsage get_memory_usage();

 };

 #endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP