The HardwareResource class models structures that hold the in-flight nodes. More...

Public Member Functions
	HardwareResource (uint16_t max_rob, uint16_t max_stores, uint16_t max_loads)
	Constructor that initializes the sizes of the structures.

void	occupy (const GraphNode *new_node)
	Occupy appropriate structures for an issued node.

void	release (const GraphNode *done_node)
	Release appropriate structures for a completed node.

void	releaseStoreBuffer ()
	Release store buffer entry for a completed store.

bool	isAvailable (const GraphNode *new_node) const
	Check if structures required to issue a node are free.

bool	awaitingResponse () const
	Check if there are any outstanding requests, i.e.

void	printOccupancy ()
	Print resource occupancy for debugging.

Private Attributes
const uint16_t	sizeROB
	The size of the ROB used to throttle the max.

const uint16_t	sizeStoreBuffer
	The size of store buffer.

const uint16_t	sizeLoadBuffer
	The size of load buffer.

std::map< NodeSeqNum, NodeRobNum >	inFlightNodes
	A map from the sequence number to the ROB number of the in- flight nodes.

NodeRobNum	oldestInFlightRobNum
	The ROB number of the oldest in-flight node.

uint16_t	numInFlightLoads
	Number of ready loads for which request may or may not be sent.

uint16_t	numInFlightStores
	Number of ready stores for which request may or may not be sent.

Detailed Description

The HardwareResource class models structures that hold the in-flight nodes.

When a node becomes dependency free, first check if resources are available to issue it.

Definition at line 646 of file trace_cpu.hh.

Constructor & Destructor Documentation

◆ HardwareResource()

gem5::TraceCPU::ElasticDataGen::HardwareResource::HardwareResource	(	uint16_t	max_rob,
		uint16_t	max_stores,
		uint16_t	max_loads )

Constructor that initializes the sizes of the structures.

Parameters

max_rob	size of the Reorder Buffer
max_stores	size of Store Buffer
max_loads	size of Load Buffer

Definition at line 825 of file trace_cpu.cc.

References numInFlightLoads, numInFlightStores, oldestInFlightRobNum, sizeLoadBuffer, sizeROB, and sizeStoreBuffer.

Member Function Documentation

◆ awaitingResponse()

bool gem5::TraceCPU::ElasticDataGen::HardwareResource::awaitingResponse ( ) const

Check if there are any outstanding requests, i.e.

requests for which we are yet to receive a response.

Returns: true if there is at least one read or write request outstanding

Definition at line 949 of file trace_cpu.cc.

References numInFlightLoads, and numInFlightStores.

◆ isAvailable()

bool gem5::TraceCPU::ElasticDataGen::HardwareResource::isAvailable ( const GraphNode * new_node ) const

Check if structures required to issue a node are free.

Parameters

node_ptr pointer to the node ready to issue

Returns: true if resources are available

Definition at line 905 of file trace_cpu.cc.

References DPRINTFR, inFlightNodes, gem5::TraceCPU::ElasticDataGen::GraphNode::isLoad(), gem5::TraceCPU::ElasticDataGen::GraphNode::isStore(), numInFlightLoads, numInFlightStores, oldestInFlightRobNum, gem5::TraceCPU::ElasticDataGen::GraphNode::robNum, gem5::TraceCPU::ElasticDataGen::GraphNode::seqNum, sizeLoadBuffer, sizeROB, and sizeStoreBuffer.

◆ occupy()

void gem5::TraceCPU::ElasticDataGen::HardwareResource::occupy ( const GraphNode * new_node )

Occupy appropriate structures for an issued node.

Parameters

node_ptr pointer to the issued node

Definition at line 836 of file trace_cpu.cc.

References inFlightNodes, gem5::TraceCPU::ElasticDataGen::GraphNode::isLoad(), gem5::TraceCPU::ElasticDataGen::GraphNode::isStore(), numInFlightLoads, numInFlightStores, oldestInFlightRobNum, printOccupancy(), gem5::TraceCPU::ElasticDataGen::GraphNode::robNum, and gem5::TraceCPU::ElasticDataGen::GraphNode::seqNum.

◆ printOccupancy()

void gem5::TraceCPU::ElasticDataGen::HardwareResource::printOccupancy ( )

Print resource occupancy for debugging.

Definition at line 956 of file trace_cpu.cc.

References DPRINTFR, numInFlightLoads, numInFlightStores, oldestInFlightRobNum, sizeLoadBuffer, and sizeStoreBuffer.

Referenced by occupy().

◆ release()

void gem5::TraceCPU::ElasticDataGen::HardwareResource::release ( const GraphNode * done_node )

Release appropriate structures for a completed node.

Parameters

node_ptr pointer to the completed node

Definition at line 855 of file trace_cpu.cc.

References DPRINTFR, inFlightNodes, gem5::TraceCPU::ElasticDataGen::GraphNode::isLoad(), gem5::TraceCPU::ElasticDataGen::GraphNode::isStore(), gem5::TraceCPU::ElasticDataGen::GraphNode::isStrictlyOrdered(), numInFlightLoads, oldestInFlightRobNum, releaseStoreBuffer(), and gem5::TraceCPU::ElasticDataGen::GraphNode::seqNum.

◆ releaseStoreBuffer()

void gem5::TraceCPU::ElasticDataGen::HardwareResource::releaseStoreBuffer ( )

Release store buffer entry for a completed store.

Definition at line 898 of file trace_cpu.cc.

References numInFlightStores.

Referenced by release().

Member Data Documentation

◆ inFlightNodes

std::map<NodeSeqNum, NodeRobNum> gem5::TraceCPU::ElasticDataGen::HardwareResource::inFlightNodes

private

A map from the sequence number to the ROB number of the in- flight nodes.

This includes all nodes that are in the readyList plus the loads for which a request has been sent which are not present in the readyList. But such loads are not yet complete and thus occupy resources. We need to query the oldest in-flight node and since a map container keeps all its keys sorted using the less than criterion, the first element is the in-flight node with the least sequence number, i.e. the oldest in-flight node.

Definition at line 725 of file trace_cpu.hh.

Referenced by isAvailable(), occupy(), and release().

◆ numInFlightLoads

uint16_t gem5::TraceCPU::ElasticDataGen::HardwareResource::numInFlightLoads

private

Number of ready loads for which request may or may not be sent.

Definition at line 733 of file trace_cpu.hh.

Referenced by awaitingResponse(), HardwareResource(), isAvailable(), occupy(), printOccupancy(), and release().

◆ numInFlightStores

uint16_t gem5::TraceCPU::ElasticDataGen::HardwareResource::numInFlightStores

private

Number of ready stores for which request may or may not be sent.

Definition at line 738 of file trace_cpu.hh.

Referenced by awaitingResponse(), HardwareResource(), isAvailable(), occupy(), printOccupancy(), and releaseStoreBuffer().

◆ oldestInFlightRobNum

NodeRobNum gem5::TraceCPU::ElasticDataGen::HardwareResource::oldestInFlightRobNum

private

The ROB number of the oldest in-flight node.

Definition at line 728 of file trace_cpu.hh.

Referenced by HardwareResource(), isAvailable(), occupy(), printOccupancy(), and release().

◆ sizeLoadBuffer

const uint16_t gem5::TraceCPU::ElasticDataGen::HardwareResource::sizeLoadBuffer

private

The size of load buffer.

This is used to throttle the max. number of in-flight loads.

Definition at line 713 of file trace_cpu.hh.

Referenced by HardwareResource(), isAvailable(), and printOccupancy().

◆ sizeROB

const uint16_t gem5::TraceCPU::ElasticDataGen::HardwareResource::sizeROB

private

The size of the ROB used to throttle the max.

number of in-flight nodes.

Definition at line 701 of file trace_cpu.hh.

Referenced by HardwareResource(), and isAvailable().

◆ sizeStoreBuffer

const uint16_t gem5::TraceCPU::ElasticDataGen::HardwareResource::sizeStoreBuffer

private

The size of store buffer.

This is used to throttle the max. number of in-flight stores.

Definition at line 707 of file trace_cpu.hh.

Referenced by HardwareResource(), isAvailable(), and printOccupancy().

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

cpu/trace/trace_cpu.hh
cpu/trace/trace_cpu.cc

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ HardwareResource()

Member Function Documentation

◆ awaitingResponse()

◆ isAvailable()

◆ occupy()

◆ printOccupancy()

◆ release()

◆ releaseStoreBuffer()

Member Data Documentation

◆ inFlightNodes

◆ numInFlightLoads

◆ numInFlightStores

◆ oldestInFlightRobNum

◆ sizeLoadBuffer

◆ sizeROB

◆ sizeStoreBuffer