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/*
* Copyright (c) 2007, 2019, 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.
*
*/
#ifndef SHARE_GC_G1_G1MEMORYPOOL_HPP
#define SHARE_GC_G1_G1MEMORYPOOL_HPP
#include "gc/g1/g1MonitoringSupport.hpp"
#include "services/memoryPool.hpp"
#include "services/memoryUsage.hpp"
// 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.
//
class G1CollectedHeap;
// This class is shared by the three G1 memory pool classes
// (G1EdenPool, G1SurvivorPool, G1OldGenPool).
class G1MemoryPoolSuper : public CollectedMemoryPool {
protected:
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 initial_size);
size_t used_in_bytes() { return _g1mm->eden_space_used(); }
MemoryUsage get_memory_usage();
};
// Memory pool that represents the G1 survivor.
class G1SurvivorPool : public G1MemoryPoolSuper {
public:
G1SurvivorPool(G1CollectedHeap* g1h, size_t initial_size);
size_t used_in_bytes() { return _g1mm->survivor_space_used(); }
MemoryUsage get_memory_usage();
};
// Memory pool that represents the G1 old gen.
class G1OldGenPool : public G1MemoryPoolSuper {
public:
G1OldGenPool(G1CollectedHeap* g1h, size_t initial_size, size_t max_size);
size_t used_in_bytes() { return _g1mm->old_gen_used(); }
MemoryUsage get_memory_usage();
};
#endif // SHARE_GC_G1_G1MEMORYPOOL_HPP
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