Mem::Allocator Class Reference

#include <Allocator.h>

Inheritance diagram for Mem::Allocator:

Collaboration diagram for Mem::Allocator:

Public Member Functions
	Allocator (const char *const aLabel, const size_t sz)
void	relabel (const char *const aLabel)
virtual size_t	getStats (PoolStats &)=0
void *	alloc ()
	provide (and reserve) memory suitable for storing one object More...
void	freeOne (void *obj)
	return memory reserved by alloc() More...
int	getInUseCount () const
	the difference between the number of alloc() and freeOne() calls More...
void	zeroBlocks (const bool doIt)
virtual void	setChunkSize (size_t)
	XXX: Misplaced – not all allocators have a notion of a "chunk". See MemPoolChunked. More...
virtual bool	idleTrigger (int shift) const =0
virtual void	clean (time_t maxage)=0
void	flushCounters ()

Static Public Member Functions
static size_t	RoundedSize (const size_t minSize)

Public Attributes
size_t	countAlloc = 0
	the number of calls to Mem::Allocator::alloc() since last flush More...
size_t	countSavedAllocs = 0
	the number of malloc()/calloc() calls avoided since last flush More...
size_t	countFreeOne = 0
	the number of calls to Mem::Allocator::freeOne() since last flush More...
const char *	label
	brief description of objects returned by alloc() More...
const size_t	objectSize
	the size (in bytes) of objects managed by this allocator More...
PoolMeter	meter
	statistics tracked for this allocator More...

Static Public Attributes
static const size_t	FlushLimit = 1000
	Flush counters to 'meter' after flush limit allocations. More...

Protected Member Functions
virtual void *	allocate ()=0
	*alloc() More...
virtual void	deallocate (void *)=0
	freeOne(void *) More...

Protected Attributes
bool	doZero = true

Detailed Description

An interface for memory allocators that deal with fixed-size objects. Allocators may optimize repeated de/allocations using memory pools.

Definition at line 21 of file Allocator.h.

Constructor & Destructor Documentation

Allocator()

Mem::Allocator::Allocator ( const char *const  aLabel, const size_t  sz  )

inline

Definition at line 27 of file Allocator.h.

Member Function Documentation

alloc()

void * Mem::Allocator::alloc ( )

inline

Definition at line 44 of file Allocator.h.

References allocate(), countAlloc, flushCounters(), and FlushLimit.

Referenced by Mem::AllocatorProxy::alloc(), authenticateDigestNonceNew(), cbdataInternalAlloc(), memAllocate(), squidaio_close(), squidaio_init(), squidaio_open(), squidaio_read(), squidaio_stat(), squidaio_unlink(), and squidaio_write().

allocate()

virtual void * Mem::Allocator::allocate ( )

protectedpure virtual

*alloc()

Implemented in MemPoolChunked, and MemPoolMalloc.

Referenced by alloc().

clean()

virtual void Mem::Allocator::clean ( time_t  maxage )

pure virtual

Implemented in MemPoolChunked, and MemPoolMalloc.

deallocate()

virtual void Mem::Allocator::deallocate ( void *  )

protectedpure virtual

freeOne(void *)

Implemented in MemPoolChunked, and MemPoolMalloc.

Referenced by freeOne().

flushCounters()

void Mem::Allocator::flushCounters ( )

inline

Flush temporary counter values into the statistics held in 'meter'.

Definition at line 74 of file Allocator.h.

References countAlloc, countFreeOne, countSavedAllocs, Mem::PoolMeter::gb_allocated, Mem::PoolMeter::gb_freed, Mem::PoolMeter::gb_saved, meter, objectSize, and Mem::PoolMeter::mgb_t::update().

Referenced by MemPoolChunked::~MemPoolChunked(), alloc(), and MemPoolChunked::clean().

freeOne()

void Mem::Allocator::freeOne ( void *  obj )

inline

Definition at line 51 of file Allocator.h.

References assert, countFreeOne, deallocate(), objectSize, and VALGRIND_CHECK_MEM_IS_ADDRESSABLE.

Referenced by cbdata::~cbdata(), authenticateDigestNonceDelete(), memFree(), and squidaio_cleanup_request().

getInUseCount()

int Mem::Allocator::getInUseCount ( ) const

inline

Definition at line 59 of file Allocator.h.

References Mem::Meter::currentLevel(), Mem::PoolMeter::inuse, and meter.

Referenced by MemPoolChunked::~MemPoolChunked(), MemPoolMalloc::~MemPoolMalloc(), MemPoolChunked::getStats(), MemPoolMalloc::getStats(), StoreEntry::inUseCount(), memInUse(), and memStringCount().

getStats()

virtual size_t Mem::Allocator::getStats ( PoolStats &  )

pure virtual

fill the given object with statistical data about pool

Returns

Number of objects in use, ie. allocated.

Implemented in MemPoolChunked, and MemPoolMalloc.

idleTrigger()

virtual bool Mem::Allocator::idleTrigger ( int  shift ) const

pure virtual

Implemented in MemPoolChunked, and MemPoolMalloc.

relabel()

void Mem::Allocator::relabel ( const char *const  aLabel )

inline

change the allocator description if we were only able to provide an approximate description at object construction time

Definition at line 34 of file Allocator.h.

References label.

RoundedSize()

static size_t Mem::Allocator::RoundedSize ( const size_t  minSize )

inlinestatic

Parameters

minSize

Minimum size needed to be allocated.

Return values

n	Smallest size divisible by sizeof(void*)

Definition at line 93 of file Allocator.h.

Referenced by GetStrPool().

setChunkSize()

virtual void Mem::Allocator::setChunkSize ( size_t  )

inlinevirtual

Reimplemented in MemPoolChunked.

Definition at line 65 of file Allocator.h.

Referenced by Mem::Init().

zeroBlocks()

void Mem::Allocator::zeroBlocks ( const bool  doIt )

inline

See also

doZero

Definition at line 62 of file Allocator.h.

References doZero.

Referenced by Mem::AllocatorProxy::getAllocator(), GetStrPool(), and memDataInit().

Member Data Documentation

countAlloc

size_t Mem::Allocator::countAlloc = 0

Definition at line 98 of file Allocator.h.

Referenced by alloc(), and flushCounters().

countFreeOne

size_t Mem::Allocator::countFreeOne = 0

Definition at line 104 of file Allocator.h.

Referenced by flushCounters(), and freeOne().

countSavedAllocs

size_t Mem::Allocator::countSavedAllocs = 0

Definition at line 101 of file Allocator.h.

Referenced by MemPoolMalloc::allocate(), flushCounters(), and MemPoolChunked::get().

doZero

bool Mem::Allocator::doZero = true

protected

Whether to zero memory on initial allocation and on return to the pool.

We do this on some pools because many object constructors are/were incomplete and we are afraid some code may use the object after free. When possible, set this to false to avoid zeroing overheads.

Definition at line 130 of file Allocator.h.

Referenced by MemChunk::MemChunk(), MemPoolMalloc::allocate(), MemPoolMalloc::deallocate(), MemPoolChunked::push(), and zeroBlocks().

FlushLimit

const size_t Mem::Allocator::FlushLimit = 1000

static

Definition at line 25 of file Allocator.h.

Referenced by alloc().

label

const char* Mem::Allocator::label

Definition at line 109 of file Allocator.h.

Referenced by MemPoolChunked::getStats(), MemPoolMalloc::getStats(), and relabel().

meter

PoolMeter Mem::Allocator::meter

Definition at line 115 of file Allocator.h.

Referenced by MemChunk::MemChunk(), MemChunk::~MemChunk(), MemPoolChunked::allocate(), MemPoolMalloc::allocate(), MemPoolMalloc::clean(), MemPoolChunked::deallocate(), MemPoolMalloc::deallocate(), flushCounters(), getInUseCount(), MemPoolChunked::getStats(), MemPoolMalloc::getStats(), MemPoolChunked::idleTrigger(), and Mem::Report().

objectSize

const size_t Mem::Allocator::objectSize

Definition at line 112 of file Allocator.h.

Referenced by MemChunk::MemChunk(), MemPoolMalloc::allocate(), MemPoolMalloc::deallocate(), flushCounters(), freeOne(), MemPoolChunked::get(), MemPoolChunked::getStats(), MemPoolMalloc::getStats(), MemPoolChunked::push(), and MemPoolChunked::setChunkSize().

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

• src/mem/Allocator.h