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reader.go
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reader.go
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//go:build linux && amd64
package intel_pmu
import (
"fmt"
"time"
ia "github.com/intel/iaevents"
"golang.org/x/sync/errgroup"
)
type coreMetric struct {
values ia.CounterValue
scaled uint64
name string
tag string
cpu int
time time.Time
}
type uncoreMetric struct {
values ia.CounterValue
scaled uint64
name string
unitType string
unit string
tag string
socket int
agg bool
time time.Time
}
type valuesReader interface {
readValue(event *ia.ActiveEvent) (ia.CounterValue, error)
}
type iaValuesReader struct{}
func (iaValuesReader) readValue(event *ia.ActiveEvent) (ia.CounterValue, error) {
return event.ReadValue()
}
type entitiesValuesReader interface {
readEntities([]*CoreEventEntity, []*UncoreEventEntity) ([]coreMetric, []uncoreMetric, error)
}
type iaEntitiesValuesReader struct {
eventReader valuesReader
timer clock
}
type clock interface {
now() time.Time
}
type realClock struct{}
func (realClock) now() time.Time {
return time.Now()
}
func (ie *iaEntitiesValuesReader) readEntities(coreEntities []*CoreEventEntity, uncoreEntities []*UncoreEventEntity) ([]coreMetric, []uncoreMetric, error) {
var coreMetrics []coreMetric
var uncoreMetrics []uncoreMetric
for _, entity := range coreEntities {
newMetrics, err := ie.readCoreEvents(entity)
if err != nil {
return nil, nil, err
}
coreMetrics = append(coreMetrics, newMetrics...)
}
for _, entity := range uncoreEntities {
newMetrics, err := ie.readUncoreEvents(entity)
if err != nil {
return nil, nil, err
}
uncoreMetrics = append(uncoreMetrics, newMetrics...)
}
return coreMetrics, uncoreMetrics, nil
}
func (ie *iaEntitiesValuesReader) readCoreEvents(entity *CoreEventEntity) ([]coreMetric, error) {
if ie.eventReader == nil || ie.timer == nil {
return nil, fmt.Errorf("event values reader or timer is nil")
}
if entity == nil {
return nil, fmt.Errorf("entity is nil")
}
metrics := make([]coreMetric, len(entity.activeEvents))
errGroup := errgroup.Group{}
for i, event := range entity.activeEvents {
id := i
actualEvent := event
if event == nil || event.PerfEvent == nil {
return nil, fmt.Errorf("active event or corresponding perf event is nil")
}
errGroup.Go(func() error {
values, err := ie.eventReader.readValue(actualEvent)
if err != nil {
return fmt.Errorf("failed to read core event %q values: %w", actualEvent, err)
}
cpu, _ := actualEvent.PMUPlacement()
newMetric := coreMetric{
values: values,
tag: entity.EventsTag,
cpu: cpu,
name: actualEvent.PerfEvent.Name,
time: ie.timer.now(),
}
metrics[id] = newMetric
return nil
})
}
err := errGroup.Wait()
if err != nil {
return nil, err
}
return metrics, nil
}
func (ie *iaEntitiesValuesReader) readUncoreEvents(entity *UncoreEventEntity) ([]uncoreMetric, error) {
if entity == nil {
return nil, fmt.Errorf("entity is nil")
}
var uncoreMetrics []uncoreMetric
for _, event := range entity.activeMultiEvents {
if entity.Aggregate {
newMetric, err := ie.readMultiEventAgg(event)
if err != nil {
return nil, err
}
newMetric.tag = entity.EventsTag
uncoreMetrics = append(uncoreMetrics, newMetric)
} else {
newMetrics, err := ie.readMultiEventSeparately(event)
if err != nil {
return nil, err
}
for i := range newMetrics {
newMetrics[i].tag = entity.EventsTag
}
uncoreMetrics = append(uncoreMetrics, newMetrics...)
}
}
return uncoreMetrics, nil
}
func (ie *iaEntitiesValuesReader) readMultiEventSeparately(multiEvent multiEvent) ([]uncoreMetric, error) {
if ie.eventReader == nil || ie.timer == nil {
return nil, fmt.Errorf("event values reader or timer is nil")
}
if len(multiEvent.activeEvents) < 1 || multiEvent.perfEvent == nil {
return nil, fmt.Errorf("no active events or perf event is nil")
}
activeEvents := multiEvent.activeEvents
perfEvent := multiEvent.perfEvent
metrics := make([]uncoreMetric, len(activeEvents))
group := errgroup.Group{}
for i, event := range activeEvents {
id := i
actualEvent := event
group.Go(func() error {
values, err := ie.eventReader.readValue(actualEvent)
if err != nil {
return fmt.Errorf("failed to read uncore event %q values: %w", actualEvent, err)
}
newMetric := uncoreMetric{
values: values,
socket: multiEvent.socket,
unitType: perfEvent.PMUName,
name: perfEvent.Name,
unit: actualEvent.PMUName(),
time: ie.timer.now(),
}
metrics[id] = newMetric
return nil
})
err := group.Wait()
if err != nil {
return nil, err
}
}
return metrics, nil
}
func (ie *iaEntitiesValuesReader) readMultiEventAgg(multiEvent multiEvent) (uncoreMetric, error) {
if ie.eventReader == nil || ie.timer == nil {
return uncoreMetric{}, fmt.Errorf("event values reader or timer is nil")
}
if len(multiEvent.activeEvents) < 1 || multiEvent.perfEvent == nil {
return uncoreMetric{}, fmt.Errorf("no active events or perf event is nil")
}
activeEvents := multiEvent.activeEvents
perfEvent := multiEvent.perfEvent
values := make([]ia.CounterValue, len(activeEvents))
group := errgroup.Group{}
for i, event := range activeEvents {
id := i
actualEvent := event
group.Go(func() error {
value, err := ie.eventReader.readValue(actualEvent)
if err != nil {
return fmt.Errorf("failed to read uncore event %q values: %w", actualEvent, err)
}
values[id] = value
return nil
})
}
err := group.Wait()
if err != nil {
return uncoreMetric{}, err
}
bRaw, bEnabled, bRunning := ia.AggregateValues(values)
if !bRaw.IsUint64() || !bEnabled.IsUint64() || !bRunning.IsUint64() {
return uncoreMetric{}, fmt.Errorf("cannot aggregate %q values, uint64 exceeding", perfEvent)
}
aggValues := ia.CounterValue{
Raw: bRaw.Uint64(),
Enabled: bEnabled.Uint64(),
Running: bRunning.Uint64(),
}
newMetric := uncoreMetric{
values: aggValues,
socket: multiEvent.socket,
unitType: perfEvent.PMUName,
name: perfEvent.Name,
time: ie.timer.now(),
}
return newMetric, nil
}