lru::LruCache< Key, Value >::MemoryAllocator< M > Class Template Reference

Inheritance diagram for lru::LruCache< Key, Value >::MemoryAllocator< M >:

Collaboration diagram for lru::LruCache< Key, Value >::MemoryAllocator< M >:

Public Member Functions
	MemoryAllocator (const unsigned int num_slots)
virtual	~MemoryAllocator ()
bool	IsFull () const
T *	Construct (const T object)
void	Destruct (T *object)
T *	Allocate ()
void	Deallocate (T *slot)
uint64_t	bytes_allocated ()

Static Public Member Functions
static double	GetEntrySize ()

Private Member Functions
bool	GetBit (const unsigned position)
void	SetBit (const unsigned position)
void	UnsetBit (const unsigned position)
Private Member Functions inherited from SingleCopy
	SingleCopy ()

Private Attributes
unsigned int	num_slots_
unsigned int	num_free_slots_
unsigned int	next_free_slot_
uint64_t	bytes_allocated_
uint64_t *	bitmap_
unsigned	bits_per_block_
T *	memory_

Detailed Description

template<class Key, class Value>
template<class M>
class lru::LruCache< Key, Value >::MemoryAllocator< M >

A special purpose memory allocator for the cache entries. It allocates enough memory for the maximal number of cache entries at startup, and assigns new ListEntryContent objects to a free spot in this memory pool (by overriding the 'new' and 'delete' operators of ListEntryContent).

Parameters

T	the type of object to be allocated by this MemoryAllocator

Definition at line 115 of file lru.h.

Constructor & Destructor Documentation

template<class Key, class Value>

template<class M>

lru::LruCache< Key, Value >::MemoryAllocator< M >::MemoryAllocator ( const unsigned int  num_slots )

inlineexplicit

Creates a MemoryAllocator to handle a memory pool for objects of type T

Parameters

num_slots

the number of slots to be allocated for the given datatype T

Definition at line 148 of file lru.h.

template<class Key, class Value>

template<class M>

virtual lru::LruCache< Key, Value >::MemoryAllocator< M >::~MemoryAllocator ( )

inlinevirtual

The memory allocator also frees all allocated data

Definition at line 179 of file lru.h.

Member Function Documentation

template<class Key, class Value>

template<class M>

T* lru::LruCache< Key, Value >::MemoryAllocator< M >::Allocate ( )

inline

Allocate a slot and returns a pointer to the memory.

Returns

a pointer to a chunk of the memory pool

Definition at line 207 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Construct().

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template<class Key, class Value>

template<class M>

uint64_t lru::LruCache< Key, Value >::MemoryAllocator< M >::bytes_allocated ( )

inline

Definition at line 250 of file lru.h.

Referenced by lru::LruCache< shash::Any, MemoryBuffer >::Drop(), and lru::LruCache< shash::Any, MemoryBuffer >::LruCache().

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template<class Key, class Value>

template<class M>

T* lru::LruCache< Key, Value >::MemoryAllocator< M >::Construct ( const T  object )

inline

Definition at line 190 of file lru.h.

Referenced by lru::LruCache< Key, Value >::ListEntryHead< fuse_ino_t >::PushBack().

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template<class Key, class Value>

template<class M>

void lru::LruCache< Key, Value >::MemoryAllocator< M >::Deallocate ( T *  slot )

inline

Free a given slot in the memory pool

Parameters

slot	a pointer to the slot be freed

Definition at line 234 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Destruct().

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template<class Key, class Value>

template<class M>

void lru::LruCache< Key, Value >::MemoryAllocator< M >::Destruct ( T *  object )

inline

Definition at line 198 of file lru.h.

Referenced by lru::LruCache< Key, Value >::ListEntryHead< fuse_ino_t >::clear(), lru::LruCache< shash::Any, MemoryBuffer >::FilterDelete(), lru::LruCache< shash::Any, MemoryBuffer >::Forget(), and lru::LruCache< Key, Value >::ListEntryHead< fuse_ino_t >::Pop().

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template<class Key, class Value>

template<class M>

bool lru::LruCache< Key, Value >::MemoryAllocator< M >::GetBit ( const unsigned  position )

inlineprivate

Check a bit in the internal allocation bitmap.

Parameters

position

the position to check

Returns

true if bit is set, otherwise false

Definition at line 258 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate(), and lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Deallocate().

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template<class Key, class Value>

template<class M>

static double lru::LruCache< Key, Value >::MemoryAllocator< M >::GetEntrySize ( )

inlinestatic

Number of bytes for a single entry

Definition at line 172 of file lru.h.

template<class Key, class Value>

template<class M>

bool lru::LruCache< Key, Value >::MemoryAllocator< M >::IsFull ( ) const

inline

Check if the memory pool is full.

Returns

true if all slots are occupied, otherwise false

Definition at line 188 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate().

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template<class Key, class Value>

template<class M>

void lru::LruCache< Key, Value >::MemoryAllocator< M >::SetBit ( const unsigned  position )

inlineprivate

set a bit in the internal allocation bitmap

Parameters

position

the number of the bit to be set

Definition at line 269 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate().

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template<class Key, class Value>

template<class M>

void lru::LruCache< Key, Value >::MemoryAllocator< M >::UnsetBit ( const unsigned  position )

inlineprivate

Clear a bit in the internal allocation bitmap

Parameters

position

the number of the bit to be cleared

Definition at line 279 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Deallocate().

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Member Data Documentation

template<class Key, class Value>

template<class M>

uint64_t* lru::LruCache< Key, Value >::MemoryAllocator< M >::bitmap_

private

A bitmap to mark slots as allocated.

Definition at line 289 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::GetBit(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::MemoryAllocator(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::SetBit(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::UnsetBit(), and lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::~MemoryAllocator().

template<class Key, class Value>

template<class M>

unsigned lru::LruCache< Key, Value >::MemoryAllocator< M >::bits_per_block_

private

Definition at line 290 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::GetBit(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::MemoryAllocator(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::SetBit(), and lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::UnsetBit().

template<class Key, class Value>

template<class M>

uint64_t lru::LruCache< Key, Value >::MemoryAllocator< M >::bytes_allocated_

private

Definition at line 288 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::bytes_allocated(), and lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::MemoryAllocator().

template<class Key, class Value>

template<class M>

T* lru::LruCache< Key, Value >::MemoryAllocator< M >::memory_

private

The memory pool, array of Ms.

Definition at line 291 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Deallocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::MemoryAllocator(), and lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::~MemoryAllocator().

template<class Key, class Value>

template<class M>

unsigned int lru::LruCache< Key, Value >::MemoryAllocator< M >::next_free_slot_

private

Position of next free slot in pool.

Definition at line 287 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Deallocate(), and lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::MemoryAllocator().

template<class Key, class Value>

template<class M>

unsigned int lru::LruCache< Key, Value >::MemoryAllocator< M >::num_free_slots_

private

Current number of free slots left.

Definition at line 286 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Deallocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::IsFull(), and lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::MemoryAllocator().

template<class Key, class Value>

template<class M>

unsigned int lru::LruCache< Key, Value >::MemoryAllocator< M >::num_slots_

private

Overall number of slots in memory pool.

Definition at line 285 of file lru.h.

Referenced by lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Allocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::Deallocate(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::GetBit(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::MemoryAllocator(), lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::SetBit(), and lru::LruCache< Key, Value >::MemoryAllocator< ConcreteListEntryContent >::UnsetBit().

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

• /home/sftnight/jenkins/workspace/CvmfsDoxygen/label/docker-x86_64/cvmfs/cvmfs/lru.h