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|
package statsengine
import (
"cmp"
"slices"
"time"
"ior/internal/event"
)
const processRankTopNDefault = 20
type processAccumulator struct {
topN int
maxSeen int
byPID map[uint32]*processStats
}
type processStats struct {
pid uint32
comm string
count uint64
totalBytes uint64
totalLatency uint64
}
type processSnapshotInput struct {
pid uint32
comm string
count uint64
totalBytes uint64
totalLatency uint64
}
func newProcessAccumulator() *processAccumulator {
return newProcessAccumulatorWithConfig(processRankTopNDefault)
}
func newProcessAccumulatorWithConfig(topN int) *processAccumulator {
if topN <= 0 {
topN = processRankTopNDefault
}
return newProcessAccumulatorWithLimits(topN, topN*32)
}
func newProcessAccumulatorWithLimits(topN int, maxSeen int) *processAccumulator {
if topN <= 0 {
topN = processRankTopNDefault
}
if maxSeen < topN {
maxSeen = topN
}
return &processAccumulator{
topN: topN,
maxSeen: maxSeen,
byPID: make(map[uint32]*processStats),
}
}
func (a *processAccumulator) Add(pair *event.Pair) {
if a == nil || pair == nil || pair.EnterEv == nil {
return
}
pid := pair.EnterEv.GetPid()
stats := a.byPID[pid]
if stats == nil {
stats = &processStats{pid: pid}
a.byPID[pid] = stats
}
if pair.Comm != "" && stats.comm != "" && stats.comm != pair.Comm {
// Best-effort PID reuse handling: when command name changes for an
// existing PID, treat it as a new process lifetime and reset counters.
stats = &processStats{pid: pid}
a.byPID[pid] = stats
}
stats.count++
stats.totalBytes += pair.Bytes
stats.totalLatency += pair.Duration
if pair.Comm != "" {
stats.comm = pair.Comm
}
a.compactIfNeeded()
}
func (a *processAccumulator) Snapshot(elapsed time.Duration) []ProcessSnapshot {
if a == nil {
return nil
}
return buildProcessSnapshots(a.snapshotInputs(), elapsed)
}
func (a *processAccumulator) snapshotInputs() []processSnapshotInput {
if a == nil {
return nil
}
inputs := make([]processSnapshotInput, 0, len(a.byPID))
for _, stats := range a.byPID {
inputs = append(inputs, processSnapshotInput{
pid: stats.pid,
comm: stats.comm,
count: stats.count,
totalBytes: stats.totalBytes,
totalLatency: stats.totalLatency,
})
}
return inputs
}
func buildProcessSnapshots(inputs []processSnapshotInput, elapsed time.Duration) []ProcessSnapshot {
rateDiv := elapsed.Seconds()
result := make([]ProcessSnapshot, 0, len(inputs))
for _, in := range inputs {
result = append(result, in.toSnapshot(rateDiv))
}
slices.SortFunc(result, func(a, b ProcessSnapshot) int {
if a.Syscalls != b.Syscalls {
return cmp.Compare(b.Syscalls, a.Syscalls)
}
if a.Bytes != b.Bytes {
return cmp.Compare(b.Bytes, a.Bytes)
}
return cmp.Compare(a.PID, b.PID)
})
return result
}
func (a *processAccumulator) compactIfNeeded() {
if len(a.byPID) <= a.maxSeen {
return
}
ordered := make([]*processStats, 0, len(a.byPID))
for _, stats := range a.byPID {
ordered = append(ordered, stats)
}
slices.SortFunc(ordered, func(a, b *processStats) int {
if betterProcessRank(a, b) {
return -1
}
if betterProcessRank(b, a) {
return 1
}
return 0
})
if len(ordered) > a.topN {
ordered = ordered[:a.topN]
}
kept := make(map[uint32]*processStats, len(ordered))
for _, stats := range ordered {
kept[stats.pid] = stats
}
a.byPID = kept
}
func betterProcessRank(a, b *processStats) bool {
if a.count != b.count {
return a.count > b.count
}
if a.totalBytes != b.totalBytes {
return a.totalBytes > b.totalBytes
}
return a.pid < b.pid
}
func (s processSnapshotInput) toSnapshot(rateDiv float64) ProcessSnapshot {
avg := 0.0
if s.count > 0 {
avg = float64(s.totalLatency) / float64(s.count)
}
return ProcessSnapshot{
PID: s.pid,
Comm: s.comm,
Syscalls: s.count,
RatePerSec: safeRate(s.count, rateDiv),
Bytes: s.totalBytes,
AvgLatencyNs: avg,
}
}
|
