#include <base.hh>

Inheritance diagram for BasePrefetcher:

Classes
class	PrefetchInfo
	Class containing the information needed by the prefetch to train and generate new prefetch requests. More...

class	PrefetchListener

Public Member Functions
	BasePrefetcher (const BasePrefetcherParams *p)

virtual	~BasePrefetcher ()

virtual void	setCache (BaseCache *_cache)

virtual void	notify (const PacketPtr &pkt, const PrefetchInfo &pfi)=0
	Notify prefetcher of cache access (may be any access or just misses, depending on cache parameters.) More...

virtual void	notifyFill (const PacketPtr &pkt)
	Notify prefetcher of cache fill. More...

virtual PacketPtr	getPacket ()=0

virtual Tick	nextPrefetchReadyTime () const =0

void	regStats () override
	Register local statistics. More...

void	regProbeListeners () override
	Register probe points for this object. More...

void	probeNotify (const PacketPtr &pkt, bool miss)
	Process a notification event from the ProbeListener. More...

void	addEventProbe (SimObject obj, const char name)
	Add a SimObject and a probe name to listen events from. More...

void	addTLB (BaseTLB *tlb)
	Add a BaseTLB object to be used whenever a translation is needed. More...

Public Member Functions inherited from ClockedObject
	ClockedObject (const ClockedObjectParams *p)

const Params *	params () const

void	serialize (CheckpointOut &cp) const override
	Serialize an object. More...

void	unserialize (CheckpointIn &cp) override
	Unserialize an object. More...

Enums::PwrState	pwrState () const

std::string	pwrStateName () const

std::vector< double >	pwrStateWeights () const
	Returns the percentage residency for each power state. More...

void	computeStats ()
	Record stats values like state residency by computing the time difference from previous update. More...

void	pwrState (Enums::PwrState)

Public Member Functions inherited from SimObject
const Params *	params () const

	SimObject (const Params *_params)

virtual	~SimObject ()

virtual const std::string	name () const

virtual void	init ()
	init() is called after all C++ SimObjects have been created and all ports are connected. More...

virtual void	loadState (CheckpointIn &cp)
	loadState() is called on each SimObject when restoring from a checkpoint. More...

virtual void	initState ()
	initState() is called on each SimObject when not restoring from a checkpoint. More...

virtual void	regProbePoints ()
	Register probe points for this object. More...

ProbeManager *	getProbeManager ()
	Get the probe manager for this object. More...

virtual Port &	getPort (const std::string &if_name, PortID idx=InvalidPortID)
	Get a port with a given name and index. More...

virtual void	startup ()
	startup() is the final initialization call before simulation. More...

DrainState	drain () override
	Provide a default implementation of the drain interface for objects that don't need draining. More...

virtual void	memWriteback ()
	Write back dirty buffers to memory using functional writes. More...

virtual void	memInvalidate ()
	Invalidate the contents of memory buffers. More...

void	serialize (CheckpointOut &cp) const override
	Serialize an object. More...

void	unserialize (CheckpointIn &cp) override
	Unserialize an object. More...

Public Member Functions inherited from EventManager
	EventManager (EventManager &em)

	EventManager (EventManager *em)

	EventManager (EventQueue *eq)

EventQueue *	eventQueue () const

void	schedule (Event &event, Tick when)

void	deschedule (Event &event)

void	reschedule (Event &event, Tick when, bool always=false)

void	schedule (Event *event, Tick when)

void	deschedule (Event *event)

void	reschedule (Event *event, Tick when, bool always=false)

void	wakeupEventQueue (Tick when=(Tick) -1)

void	setCurTick (Tick newVal)

Public Member Functions inherited from Serializable
	Serializable ()

virtual	~Serializable ()

void	serializeSection (CheckpointOut &cp, const char *name) const
	Serialize an object into a new section. More...

void	serializeSection (CheckpointOut &cp, const std::string &name) const

void	unserializeSection (CheckpointIn &cp, const char *name)
	Unserialize an a child object. More...

void	unserializeSection (CheckpointIn &cp, const std::string &name)

Public Member Functions inherited from Drainable
DrainState	drainState () const
	Return the current drain state of an object. More...

virtual void	notifyFork ()
	Notify a child process of a fork. More...

Public Member Functions inherited from Stats::Group
	Group ()=delete

	Group (const Group &)=delete

Group &	operator= (const Group &)=delete

	Group (Group parent, const char name=nullptr)
	Construct a new statistics group. More...

virtual	~Group ()

virtual void	resetStats ()
	Callback to reset stats. More...

virtual void	preDumpStats ()
	Callback before stats are dumped. More...

void	addStat (Stats::Info *info)
	Register a stat with this group. More...

const std::map< std::string, Group * > &	getStatGroups () const
	Get all child groups associated with this object. More...

const std::vector< Info * > &	getStats () const
	Get all stats associated with this object. More...

void	addStatGroup (const char name, Group block)
	Add a stat block as a child of this block. More...

Public Member Functions inherited from Clocked
void	updateClockPeriod ()
	Update the tick to the current tick. More...

Tick	clockEdge (Cycles cycles=Cycles(0)) const
	Determine the tick when a cycle begins, by default the current one, but the argument also enables the caller to determine a future cycle. More...

Cycles	curCycle () const
	Determine the current cycle, corresponding to a tick aligned to a clock edge. More...

Tick	nextCycle () const
	Based on the clock of the object, determine the start tick of the first cycle that is at least one cycle in the future. More...

uint64_t	frequency () const

Tick	clockPeriod () const

double	voltage () const

Cycles	ticksToCycles (Tick t) const

Tick	cyclesToTicks (Cycles c) const

Protected Member Functions
bool	observeAccess (const PacketPtr &pkt, bool miss) const
	Determine if this access should be observed. More...

bool	inCache (Addr addr, bool is_secure) const
	Determine if address is in cache. More...

bool	inMissQueue (Addr addr, bool is_secure) const
	Determine if address is in cache miss queue. More...

bool	hasBeenPrefetched (Addr addr, bool is_secure) const

bool	samePage (Addr a, Addr b) const
	Determine if addresses are on the same page. More...

Addr	blockAddress (Addr a) const
	Determine the address of the block in which a lays. More...

Addr	blockIndex (Addr a) const
	Determine the address of a at block granularity. More...

Addr	pageAddress (Addr a) const
	Determine the address of the page in which a lays. More...

Addr	pageOffset (Addr a) const
	Determine the page-offset of a. More...

Addr	pageIthBlockAddress (Addr page, uint32_t i) const
	Build the address of the i-th block inside the page. More...

Protected Member Functions inherited from Drainable
	Drainable ()

virtual	~Drainable ()

virtual void	drainResume ()
	Resume execution after a successful drain. More...

void	signalDrainDone () const
	Signal that an object is drained. More...

Protected Member Functions inherited from Clocked
	Clocked (ClockDomain &clk_domain)
	Create a clocked object and set the clock domain based on the parameters. More...

	Clocked (Clocked &)=delete

Clocked &	operator= (Clocked &)=delete

virtual	~Clocked ()
	Virtual destructor due to inheritance. More...

void	resetClock () const
	Reset the object's clock using the current global tick value. More...

virtual void	clockPeriodUpdated ()
	A hook subclasses can implement so they can do any extra work that's needed when the clock rate is changed. More...

Protected Attributes
BaseCache *	cache
	Pointr to the parent cache. More...

unsigned	blkSize
	The block size of the parent cache. More...

unsigned	lBlkSize
	log_2(block size of the parent cache). More...

const bool	onMiss
	Only consult prefetcher on cache misses? More...

const bool	onRead
	Consult prefetcher on reads? More...

const bool	onWrite
	Consult prefetcher on reads? More...

const bool	onData
	Consult prefetcher on data accesses? More...

const bool	onInst
	Consult prefetcher on instruction accesses? More...

const MasterID	masterId
	Request id for prefetches. More...

const Addr	pageBytes

const bool	prefetchOnAccess
	Prefetch on every access, not just misses. More...

const bool	useVirtualAddresses
	Use Virtual Addresses for prefetching. More...

Stats::Scalar	pfIssued

uint64_t	issuedPrefetches
	Total prefetches issued. More...

uint64_t	usefulPrefetches
	Total prefetches that has been useful. More...

BaseTLB *	tlb
	Registered tlb for address translations. More...

Protected Attributes inherited from ClockedObject
Enums::PwrState	_currPwrState
	To keep track of the current power state. More...

Tick	prvEvalTick

ClockedObject::ClockedObjectStats	stats

Protected Attributes inherited from SimObject
const SimObjectParams *	_params
	Cached copy of the object parameters. More...

Protected Attributes inherited from EventManager
EventQueue *	eventq
	A pointer to this object's event queue. More...

Private Attributes
std::vector< PrefetchListener * >	listeners

Additional Inherited Members
Public Types inherited from ClockedObject
typedef ClockedObjectParams	Params
	Parameters of ClockedObject. More...

Public Types inherited from SimObject
typedef SimObjectParams	Params

Static Public Member Functions inherited from SimObject
static void	serializeAll (CheckpointOut &cp)
	Serialize all SimObjects in the system. More...

static SimObject *	find (const char *name)
	Find the SimObject with the given name and return a pointer to it. More...

Static Public Member Functions inherited from Serializable
static const std::string &	currentSection ()
	Get the fully-qualified name of the active section. More...

static void	serializeAll (const std::string &cpt_dir)

static void	unserializeGlobals (CheckpointIn &cp)

Static Public Attributes inherited from Serializable
static int	ckptCount = 0

static int	ckptMaxCount = 0

static int	ckptPrevCount = -1

Detailed Description

Definition at line 67 of file base.hh.

Constructor & Destructor Documentation

◆ BasePrefetcher()

BasePrefetcher::BasePrefetcher ( const BasePrefetcherParams * p )

Definition at line 92 of file base.cc.

◆ ~BasePrefetcher()

virtual BasePrefetcher::~BasePrefetcher ( )

inlinevirtual

Definition at line 337 of file base.hh.

References BasePrefetcher::PrefetchListener::notify(), and setCache().

Member Function Documentation

◆ addEventProbe()

void BasePrefetcher::addEventProbe	(	SimObject *	obj,
		const char *	name
	)

Add a SimObject and a probe name to listen events from.

Parameters

obj	The SimObject pointer to listen from
name	The probe name

Definition at line 252 of file base.cc.

References SimObject::getProbeManager(), and listeners.

Referenced by notifyFill().

◆ addTLB()

void BasePrefetcher::addTLB ( BaseTLB * tlb )

Add a BaseTLB object to be used whenever a translation is needed.

This is generally required when the prefetcher is allowed to generate page crossing references and/or uses virtual addresses for training.

Parameters

tlb	pointer to the BaseTLB object to add

Definition at line 259 of file base.cc.

References fatal_if, ArmISA::t, and tlb.

Referenced by notifyFill().

◆ blockAddress()

Addr BasePrefetcher::blockAddress ( Addr a ) const

protected

Determine the address of the block in which a lays.

Definition at line 173 of file base.cc.

References blkSize.

Referenced by TaggedPrefetcher::calculatePrefetch(), and QueuedPrefetcher::notify().

◆ blockIndex()

Addr BasePrefetcher::blockIndex ( Addr a ) const

protected

Determine the address of a at block granularity.

Definition at line 179 of file base.cc.

References lBlkSize.

Referenced by IrregularStreamBufferPrefetcher::calculatePrefetch().

◆ getPacket()

virtual PacketPtr BasePrefetcher::getPacket ( )

pure virtual

Implemented in QueuedPrefetcher, and MultiPrefetcher.

Referenced by BaseCache::getNextQueueEntry(), and notifyFill().

◆ hasBeenPrefetched()

bool BasePrefetcher::hasBeenPrefetched	(	Addr	addr,
		bool	is_secure
	)		const

protected

Definition at line 161 of file base.cc.

References cache, and BaseCache::hasBeenPrefetched().

Referenced by probeNotify().

◆ inCache()

bool BasePrefetcher::inCache	(	Addr	addr,
		bool	is_secure
	)		const

protected

Determine if address is in cache.

Definition at line 149 of file base.cc.

References cache, and BaseCache::inCache().

Referenced by STeMSPrefetcher::checkForActiveGenerationsEnd(), QueuedPrefetcher::insert(), and QueuedPrefetcher::translationComplete().

◆ inMissQueue()

bool BasePrefetcher::inMissQueue	(	Addr	addr,
		bool	is_secure
	)		const

protected

Determine if address is in cache miss queue.

Definition at line 155 of file base.cc.

References cache, and BaseCache::inMissQueue().

Referenced by STeMSPrefetcher::checkForActiveGenerationsEnd(), QueuedPrefetcher::insert(), and QueuedPrefetcher::translationComplete().

◆ nextPrefetchReadyTime()

virtual Tick BasePrefetcher::nextPrefetchReadyTime ( ) const

pure virtual

Implemented in QueuedPrefetcher, and MultiPrefetcher.

Referenced by BaseCache::nextQueueReadyTime(), notifyFill(), BaseCache::recvTimingReq(), and BaseCache::recvTimingResp().

◆ notify()

virtual void BasePrefetcher::notify	(	const PacketPtr &	pkt,
		const PrefetchInfo &	pfi
	)

pure virtual

Notify prefetcher of cache access (may be any access or just misses, depending on cache parameters.)

Implemented in QueuedPrefetcher, and MultiPrefetcher.

Referenced by probeNotify().

◆ notifyFill()

virtual void BasePrefetcher::notifyFill ( const PacketPtr & pkt )

inlinevirtual

Notify prefetcher of cache fill.

Reimplemented in SBOOEPrefetcher, BOPPrefetcher, and MultiPrefetcher.

Definition at line 348 of file base.hh.

References addEventProbe(), addTLB(), getPacket(), BasePrefetcher::PrefetchListener::miss, ProbeListener::name, nextPrefetchReadyTime(), probeNotify(), regProbeListeners(), and regStats().

◆ observeAccess()

bool BasePrefetcher::observeAccess	(	const PacketPtr &	pkt,
		bool	miss
	)		const

protected

Determine if this access should be observed.

Parameters

pkt	The memory request causing the event
miss	whether this event comes from a cache miss

Definition at line 127 of file base.cc.

References MemCmd::CleanEvict, Packet::cmd, X86ISA::inv, Packet::isInvalidate(), Packet::isRead(), onData, onInst, onMiss, onRead, onWrite, and Packet::req.

Referenced by probeNotify().

◆ pageAddress()

Addr BasePrefetcher::pageAddress ( Addr a ) const

protected

Determine the address of the page in which a lays.

Definition at line 185 of file base.cc.

References pageBytes, and roundDown().

◆ pageIthBlockAddress()

Addr BasePrefetcher::pageIthBlockAddress	(	Addr	page,
		uint32_t	i
	)		const

protected

Build the address of the i-th block inside the page.

Definition at line 197 of file base.cc.

References lBlkSize.

◆ pageOffset()

Addr BasePrefetcher::pageOffset ( Addr a ) const

protected

Determine the page-offset of a.

Definition at line 191 of file base.cc.

References pageBytes.

◆ probeNotify()

void BasePrefetcher::probeNotify	(	const PacketPtr &	pkt,
		bool	miss
	)

Process a notification event from the ProbeListener.

Parameters

pkt	The memory request causing the event
miss	whether this event comes from a cache miss

Definition at line 203 of file base.cc.

References cache, Packet::cmd, BaseCache::coalesce(), Packet::getAddr(), hasBeenPrefetched(), Packet::isSecure(), MemCmd::isSWPrefetch(), Packet::isWrite(), notify(), observeAccess(), panic, Packet::req, usefulPrefetches, and useVirtualAddresses.

Referenced by notifyFill().

◆ regProbeListeners()

void BasePrefetcher::regProbeListeners ( )

overridevirtual

Register probe points for this object.

If no probes were added by the configuration scripts, connect to the parent cache using the probe "Miss". Also connect to "Hit", if the cache is configured to prefetch on accesses.

Reimplemented from SimObject.

Definition at line 231 of file base.cc.

References cache, SimObject::getProbeManager(), listeners, and prefetchOnAccess.

Referenced by notifyFill().

◆ regStats()

void BasePrefetcher::regStats ( )

overridevirtual

Register local statistics.

Reimplemented from Stats::Group.

Reimplemented in QueuedPrefetcher.

Definition at line 115 of file base.cc.

References Stats::DataWrap< Derived, InfoProxyType >::desc(), SimObject::name(), Stats::DataWrap< Derived, InfoProxyType >::name(), pfIssued, and Stats::Group::regStats().

Referenced by notifyFill(), and QueuedPrefetcher::regStats().

◆ samePage()

bool BasePrefetcher::samePage	(	Addr	a,
		Addr	b
	)		const

protected

Determine if addresses are on the same page.

Definition at line 167 of file base.cc.

References pageBytes, and roundDown().

Referenced by QueuedPrefetcher::insert(), and QueuedPrefetcher::notify().

◆ setCache()

void BasePrefetcher::setCache ( BaseCache * _cache )

virtual

Reimplemented in MultiPrefetcher.

Definition at line 104 of file base.cc.

References blkSize, cache, floorLog2(), BaseCache::getBlockSize(), and lBlkSize.

Referenced by BaseCache::BaseCache(), and ~BasePrefetcher().

Member Data Documentation

◆ blkSize

unsigned BasePrefetcher::blkSize

protected

The block size of the parent cache.

Definition at line 264 of file base.hh.

Referenced by SignaturePathPrefetcher::addPrefetch(), blockAddress(), BOPPrefetcher::BOPPrefetcher(), TaggedPrefetcher::calculatePrefetch(), StridePrefetcher::calculatePrefetch(), STeMSPrefetcher::calculatePrefetch(), SignaturePathPrefetcher::calculatePrefetch(), STeMSPrefetcher::checkForActiveGenerationsEnd(), QueuedPrefetcher::createPrefetchRequest(), QueuedPrefetcher::insert(), setCache(), BOPPrefetcher::tag(), and QueuedPrefetcher::translationComplete().

◆ cache

BaseCache* BasePrefetcher::cache

protected

Pointr to the parent cache.

Definition at line 261 of file base.hh.

Referenced by hasBeenPrefetched(), inCache(), inMissQueue(), QueuedPrefetcher::insert(), probeNotify(), regProbeListeners(), and setCache().

◆ issuedPrefetches

uint64_t BasePrefetcher::issuedPrefetches

protected

Total prefetches issued.

Definition at line 326 of file base.hh.

Referenced by SignaturePathPrefetcherV2::calculateLookaheadConfidence(), QueuedPrefetcher::getMaxPermittedPrefetches(), and QueuedPrefetcher::getPacket().

◆ lBlkSize

unsigned BasePrefetcher::lBlkSize

protected

log_2(block size of the parent cache).

Definition at line 267 of file base.hh.

Referenced by blockIndex(), IrregularStreamBufferPrefetcher::calculatePrefetch(), BOPPrefetcher::calculatePrefetch(), SBOOEPrefetcher::calculatePrefetch(), PIFPrefetcher::calculatePrefetch(), PIFPrefetcher::notifyRetiredInst(), pageIthBlockAddress(), and setCache().

◆ listeners

std::vector<PrefetchListener *> BasePrefetcher::listeners

private

Definition at line 84 of file base.hh.

Referenced by addEventProbe(), and regProbeListeners().

◆ masterId

const MasterID BasePrefetcher::masterId

protected

Request id for prefetches.

Definition at line 285 of file base.hh.

Referenced by QueuedPrefetcher::createPrefetchRequest(), BasePrefetcher::PrefetchInfo::getMasterId(), QueuedPrefetcher::insert(), and QueuedPrefetcher::translationComplete().

◆ onData

const bool BasePrefetcher::onData

protected

Consult prefetcher on data accesses?

Definition at line 279 of file base.hh.

Referenced by observeAccess().

◆ onInst

const bool BasePrefetcher::onInst

protected

Consult prefetcher on instruction accesses?

Definition at line 282 of file base.hh.

Referenced by observeAccess().

◆ onMiss

const bool BasePrefetcher::onMiss

protected

Only consult prefetcher on cache misses?

Definition at line 270 of file base.hh.

Referenced by observeAccess().

◆ onRead

const bool BasePrefetcher::onRead

protected

Consult prefetcher on reads?

Definition at line 273 of file base.hh.

Referenced by observeAccess().

◆ onWrite

const bool BasePrefetcher::onWrite

protected

Consult prefetcher on reads?

Definition at line 276 of file base.hh.

Referenced by observeAccess().

◆ pageBytes

const Addr BasePrefetcher::pageBytes

protected

Definition at line 287 of file base.hh.

Referenced by SignaturePathPrefetcher::addPrefetch(), SignaturePathPrefetcher::calculatePrefetch(), pageAddress(), pageOffset(), and samePage().

◆ pfIssued

Stats::Scalar BasePrefetcher::pfIssued

protected

Definition at line 323 of file base.hh.

Referenced by QueuedPrefetcher::getPacket(), and regStats().

◆ prefetchOnAccess

const bool BasePrefetcher::prefetchOnAccess

protected

Prefetch on every access, not just misses.

Definition at line 290 of file base.hh.

Referenced by regProbeListeners().

◆ tlb

BaseTLB* BasePrefetcher::tlb

protected

Registered tlb for address translations.

Definition at line 331 of file base.hh.

Referenced by addTLB(), QueuedPrefetcher::DeferredPacket::markDelayed(), QueuedPrefetcher::notify(), QueuedPrefetcher::processMissingTranslations(), and QueuedPrefetcher::translationComplete().

◆ usefulPrefetches

uint64_t BasePrefetcher::usefulPrefetches

protected

Total prefetches that has been useful.

Definition at line 328 of file base.hh.

Referenced by SignaturePathPrefetcherV2::calculateLookaheadConfidence(), QueuedPrefetcher::getMaxPermittedPrefetches(), and probeNotify().

◆ useVirtualAddresses

const bool BasePrefetcher::useVirtualAddresses

protected

Use Virtual Addresses for prefetching.

Definition at line 293 of file base.hh.

Referenced by QueuedPrefetcher::insert(), and probeNotify().

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

mem/cache/prefetch/base.hh
mem/cache/prefetch/base.cc

Classes

Public Member Functions

Protected Member Functions

Protected Attributes

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ BasePrefetcher()

◆ ~BasePrefetcher()

Member Function Documentation

◆ addEventProbe()

◆ addTLB()

◆ blockAddress()

◆ blockIndex()

◆ getPacket()

◆ hasBeenPrefetched()

◆ inCache()

◆ inMissQueue()

◆ nextPrefetchReadyTime()

◆ notify()

◆ notifyFill()

◆ observeAccess()

◆ pageAddress()

◆ pageIthBlockAddress()

◆ pageOffset()

◆ probeNotify()

◆ regProbeListeners()

◆ regStats()

◆ samePage()

◆ setCache()

Member Data Documentation

◆ blkSize

◆ cache

◆ issuedPrefetches

◆ lBlkSize

◆ listeners

◆ masterId

◆ onData

◆ onInst

◆ onMiss

◆ onRead

◆ onWrite

◆ pageBytes

◆ pfIssued

◆ prefetchOnAccess

◆ tlb

◆ usefulPrefetches

◆ useVirtualAddresses