Delta Correlating Prediction Tables Prefetcher References: Multi-level hardware prefetching using low complexity delta correlating prediction tables with partial matching. More...

#include <delta_correlating_prediction_tables.hh>

Inheritance diagram for DeltaCorrelatingPredictionTables:

Classes
struct	DCPTEntry
	DCPT Table entry datatype. More...

Public Member Functions
	DeltaCorrelatingPredictionTables (DeltaCorrelatingPredictionTablesParams *p)
	Copyright (c) 2018 Metempsy Technology Consulting All rights reserved. More...

	~DeltaCorrelatingPredictionTables ()

void	calculatePrefetch (const BasePrefetcher::PrefetchInfo &pfi, std::vector< QueuedPrefetcher::AddrPriority > &addresses)
	Computes the prefetch candidates given a prefetch event. More...

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...

virtual void	regProbeListeners ()
	Register probe listeners 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	regStats ()
	Callback to set stat parameters. More...

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...

Private Attributes
const unsigned int	deltaBits
	Number of bits of each delta. More...

const unsigned int	deltaMaskBits
	Number of lower bits to ignore from the deltas. More...

AssociativeSet< DCPTEntry >	table
	The main table. More...

Additional Inherited Members
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

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 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...

Detailed Description

Delta Correlating Prediction Tables Prefetcher References: Multi-level hardware prefetching using low complexity delta correlating prediction tables with partial matching.

Marius Grannaes, Magnus Jahre, and Lasse Natvig. 2010. In Proceedings of the 5th international conference on High Performance Embedded Architectures and Compilers (HiPEAC'10)

The filter feature is not implemented as gem5 already drops redundant prefetches. The main prefetcher logic is implemented on a separate SimObject as there are other prefetcher that can rehuse this component.

Definition at line 54 of file delta_correlating_prediction_tables.hh.

Constructor & Destructor Documentation

◆ DeltaCorrelatingPredictionTables()

DeltaCorrelatingPredictionTables::DeltaCorrelatingPredictionTables ( DeltaCorrelatingPredictionTablesParams * p )

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer; redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution; neither the name of the copyright holders nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Authors: Javier Bueno

Definition at line 38 of file delta_correlating_prediction_tables.cc.

Referenced by calculatePrefetch().

◆ ~DeltaCorrelatingPredictionTables()

DeltaCorrelatingPredictionTables::~DeltaCorrelatingPredictionTables ( )

inline

Definition at line 110 of file delta_correlating_prediction_tables.hh.

References calculatePrefetch().

Member Function Documentation

◆ calculatePrefetch()

void DeltaCorrelatingPredictionTables::calculatePrefetch	(	const BasePrefetcher::PrefetchInfo &	pfi,
		std::vector< QueuedPrefetcher::AddrPriority > &	addresses
	)