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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <cstring>
namespace vespamalloc {
class Memory
{
public:
Memory(size_t blockSize);
virtual ~Memory();
void * getStart() const { return _start; }
void * getEnd() const { return _end; }
size_t getMinBlockSize() const { return _blockSize; }
static size_t getMinPreferredStartAddress() { return 0x10000000000; } // 1T
static size_t getBlockAlignment() { return 0x200000; } //2M
protected:
void setStart(void * v) { _start = v; }
void setEnd(void * v) { _end = v; }
size_t _blockSize;
void * _start;
void * _end;
};
class MmapMemory : public Memory
{
public:
MmapMemory(size_t blockSize);
virtual ~MmapMemory();
void *reserve(size_t & len);
void *get(size_t len);
bool release(void * mem, size_t len);
bool reclaim(void * mem, size_t len);
bool freeTail(void * mem, size_t len);
private:
void * getHugePages(size_t len);
void * getNormalPages(size_t len);
void * getBasePages(size_t len, int mmapOpt, int fd, size_t offset);
void setupFAdvise();
void setupHugePages();
size_t _useMAdvLimit;
int _hugePagesFd;
size_t _hugePagesOffset;
size_t _hugePageSize;
char _hugePagesFileName[1024];
};
}
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