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94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/******************************************************************************************
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* $Id$
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*
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******************************************************************************************/
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/* This allocator is an attempt to consolidate small allocations and
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deallocations to boost performance and reduce mem fragmentation. */
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#ifndef POOLALLOCATOR_H_
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#define POOLALLOCATOR_H_
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#include <unistd.h>
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#include <stdint.h>
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#include <vector>
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#include <map>
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#include <boost/shared_array.hpp>
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namespace utils
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{
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class PoolAllocator
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{
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public:
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static const unsigned DEFAULT_WINDOW_SIZE = 4096 * 40; // should be an integral # of pages
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explicit PoolAllocator(unsigned windowSize = DEFAULT_WINDOW_SIZE, bool isTmpSpace = false) :
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allocSize(windowSize),
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tmpSpace(isTmpSpace),
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capacityRemaining(0),
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memUsage(0),
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nextAlloc(0) { }
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PoolAllocator(const PoolAllocator& p) :
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allocSize(p.allocSize),
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tmpSpace(p.tmpSpace),
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capacityRemaining(0),
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memUsage(0),
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nextAlloc(0) { }
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virtual ~PoolAllocator() {}
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PoolAllocator& operator=(const PoolAllocator&);
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void* allocate(uint64_t size);
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void deallocate(void* p);
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void deallocateAll();
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inline uint64_t getMemUsage() const
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{
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return memUsage;
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}
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unsigned getWindowSize() const
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{
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return allocSize;
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}
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private:
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void newBlock();
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unsigned allocSize;
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std::vector<boost::shared_array<uint8_t> > mem;
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bool tmpSpace;
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unsigned capacityRemaining;
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uint64_t memUsage;
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uint8_t* nextAlloc;
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struct OOBMemInfo
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{
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boost::shared_array<uint8_t> mem;
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uint64_t size;
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};
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typedef std::map<void*, OOBMemInfo> OutOfBandMap;
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OutOfBandMap oob; // for mem chunks bigger than the window size; these can be dealloc'd
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};
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}
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#endif
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