DramArena Class Reference

#include <ArenaAllocator.h>

Inheritance diagram for DramArena:

Collaboration diagram for DramArena:

Public Member Functions
	DramArena (size_t min_block_size=1ULL<< 32, size_t size_limit=0)
	~DramArena () override
void *	allocate (size_t num_bytes) override
void *	allocateAndZero (const size_t size) override
size_t	bytesUsed () const override
size_t	totalBytes () const override
MemoryType	getMemoryType () const override
Public Member Functions inherited from Arena
virtual	~Arena ()

Private Attributes
size_t	size_limit_
size_t	size_
SysAllocator< void >	allocator_
std::vector< std::pair< void *, size_t > >	allocations_

Additional Inherited Members
Public Types inherited from Arena
enum	MemoryType { MemoryType::DRAM, MemoryType::PMEM }

Detailed Description

A naive allocator which calls malloc and maintains a list of allocate pointers for freeing. For development and testing only, where folly is not available. Not for production use.

Definition at line 119 of file ArenaAllocator.h.

Constructor & Destructor Documentation

DramArena::DramArena ( size_t  min_block_size = 1ULL << 32, size_t  size_limit = 0  )

inlineexplicit

Definition at line 121 of file ArenaAllocator.h.

      : size_limit_(size_limit), size_(0) {}

DramArena::~DramArena ( )

inlineoverride

Definition at line 124 of file ArenaAllocator.h.

References allocations_, allocator_, SysAllocator< T >::deallocate(), and size_.

                        {
    for (auto [ptr, size] : allocations_) {
      allocator_.deallocate(ptr, 0);
      size_ -= size;
    }
  }

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Member Function Documentation

void* DramArena::allocate ( size_t  num_bytes )

inlineoverridevirtual

Implements Arena.

Definition at line 131 of file ArenaAllocator.h.

References SysAllocator< T >::allocate(), allocations_, allocator_, size_, and size_limit_.

Referenced by allocateAndZero().

                                            {
    if (size_limit_ != 0 && size_ + num_bytes > size_limit_) {
      throw OutOfHostMemory(num_bytes);
    }
    auto ret = allocator_.allocate(num_bytes);
    size_ += num_bytes;
    allocations_.push_back({ret, num_bytes});
    return ret;
  }

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void* DramArena::allocateAndZero ( const size_t  size )

inlineoverridevirtual

Implements Arena.

Definition at line 141 of file ArenaAllocator.h.

References allocate().

                                                    {
    auto ret = allocate(size);
    std::memset(ret, 0, size);
    return ret;
  }

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size_t DramArena::bytesUsed ( ) const

inlineoverridevirtual

Implements Arena.

Definition at line 147 of file ArenaAllocator.h.

References size_.

{ return size_; }

MemoryType DramArena::getMemoryType ( ) const

inlineoverridevirtual

Implements Arena.

Definition at line 151 of file ArenaAllocator.h.

References Arena::DRAM.

{ return MemoryType::DRAM; }

size_t DramArena::totalBytes ( ) const

inlineoverridevirtual

Implements Arena.

Definition at line 149 of file ArenaAllocator.h.

References size_.

{ return size_; }

Member Data Documentation

std::vector<std::pair<void*, size_t> > DramArena::allocations_

private

Definition at line 157 of file ArenaAllocator.h.

Referenced by allocate(), and ~DramArena().

SysAllocator<void> DramArena::allocator_

private

Definition at line 156 of file ArenaAllocator.h.

Referenced by allocate(), and ~DramArena().

size_t DramArena::size_

private

Definition at line 155 of file ArenaAllocator.h.

Referenced by allocate(), bytesUsed(), totalBytes(), and ~DramArena().

size_t DramArena::size_limit_

private

Definition at line 154 of file ArenaAllocator.h.

Referenced by allocate().

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The documentation for this class was generated from the following file:

• /home/jenkins-slave/workspace/core-os-doxygen/DataMgr/Allocators/ArenaAllocator.h