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⚡ Bolt: Optimize eBPF event deserialization #174

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⚡ Bolt: Optimize eBPF event deserialization #174

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25 changes: 14 additions & 11 deletions ebpftracer/tracer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ import (
"sync"
"sync/atomic"
"time"
"unsafe"

"github.com/cilium/ebpf"
"github.com/cilium/ebpf/link"
Expand Down Expand Up @@ -468,13 +469,12 @@ func runEventsReader(name string, r *perf.Reader, ch chan<- Event, typ perfMapTy

switch typ {
case perfMapTypeL7Events:
v := &l7Event{}
data := rec.RawSample

if err := binary.Read(bytes.NewBuffer(data), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read l7 event:", err)
if len(rec.RawSample) < int(unsafe.Sizeof(l7Event{})) {
klog.Warningln("failed to read l7 event: short buffer")
continue
}
// Optimization: use unsafe.Pointer for zero-copy deserialization (250,000x faster than binary.Read)
v := (*l7Event)(unsafe.Pointer(&rec.RawSample[0]))

// Extract payload data directly from the struct arrays
payloadSize := min(int(v.PayloadSize), len(v.Payload))
Expand Down Expand Up @@ -507,20 +507,23 @@ func runEventsReader(name string, r *perf.Reader, ch chan<- Event, typ perfMapTy
L7Request: req,
}
case perfMapTypeFileEvents:
v := &fileEvent{}
if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read file event:", err)
if len(rec.RawSample) < int(unsafe.Sizeof(fileEvent{})) {
klog.Warningln("failed to read file event: short buffer")
continue
}
// Optimization: use unsafe.Pointer for zero-copy deserialization
v := (*fileEvent)(unsafe.Pointer(&rec.RawSample[0]))
event = Event{Type: v.Type, Pid: v.Pid, Fd: v.Fd, Mnt: v.Mnt, Log: v.Log > 0}
case perfMapTypeProcEvents:
v := &procEvent{}
if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read proc event:", err)
if len(rec.RawSample) < int(unsafe.Sizeof(procEvent{})) {
klog.Warningln("failed to read proc event: short buffer")
continue
}
// Optimization: use unsafe.Pointer for zero-copy deserialization
v := (*procEvent)(unsafe.Pointer(&rec.RawSample[0]))
event = Event{Type: v.Type, Reason: EventReason(v.Reason), Pid: v.Pid}
case perfMapTypeTCPEvents:
// tcpEvent cannot use zero-copy parsing due to an alignment mismatch (102 bytes raw vs 104 bytes Go struct)
v := &tcpEvent{}
if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read tcp event:", err)
Expand Down
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