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|
package internal
import "C"
import (
"context"
"fmt"
"os"
"os/signal"
"runtime/pprof"
"syscall"
"time"
"ior/internal/flags"
"ior/internal/flamegraph"
"ior/internal/tracepoints"
bpf "github.com/aquasecurity/libbpfgo"
)
type tracepointProgram interface {
attachTracepoint(category, name string) error
}
type tracepointModule interface {
getProgram(progName string) (tracepointProgram, error)
}
type libbpfTracepointProgram struct {
prog *bpf.BPFProg
}
func (p libbpfTracepointProgram) attachTracepoint(category, name string) error {
_, err := p.prog.AttachTracepoint(category, name)
return err
}
type libbpfTracepointModule struct {
module *bpf.Module
}
func (m libbpfTracepointModule) getProgram(progName string) (tracepointProgram, error) {
prog, err := m.module.GetProgram(progName)
if err != nil {
return nil, err
}
return libbpfTracepointProgram{prog: prog}, nil
}
func attachTracepoints(bpfModule *bpf.Module) error {
return attachTracepointsWith(libbpfTracepointModule{module: bpfModule}, flags.Get().ShouldIAttachTracepoint, tracepoints.List)
}
func attachTracepointsWith(module tracepointModule, shouldAttach func(string) bool, tracepointNames []string) error {
for _, name := range tracepointNames {
if !shouldAttach(name) {
continue
}
fmt.Println("Attaching tracepoint", name)
prog, err := module.getProgram(fmt.Sprintf("handle_%s", name))
if err != nil {
return fmt.Errorf("Failed to get BPF program handle_%s: %v", name, err)
}
fmt.Println("Attached prog handle_", name)
if err = prog.attachTracepoint("syscalls", name); err != nil {
// OK, older Kernel versions may not have this tracepoint!
fmt.Printf("Failed to attach to %s tracepoint: %v, kernel version may be too old, skipping", name, err)
continue
}
fmt.Println("Attached tracepoint ", name)
}
return nil
}
func Run() error {
flags.PrintVersion()
iorFile := flags.Get().IorDataFile
var noTraceRun bool
if iorFile != "" {
noTraceRun = true
collapsed := flamegraph.NewCollapsed(iorFile, flags.Get().CollapsedFields, flags.Get().CountField)
collapsedFile, err := collapsed.Write(iorFile)
if err != nil {
return err
}
tool, err := flamegraph.NewTool(collapsedFile)
if err != nil {
return err
}
if err := tool.WriteSVG(); err != nil {
return err
}
}
if noTraceRun {
return nil
}
return runTrace()
}
func runTrace() error {
bpfModule, err := bpf.NewModuleFromFile("ior.bpf.o")
if err != nil {
return err
}
defer bpfModule.Close()
if err := flags.Get().ResizeBPFMaps(bpfModule); err != nil {
return err
}
if err := flags.Get().SetBPF(bpfModule); err != nil {
return err
}
if err := bpfModule.BPFLoadObject(); err != nil {
return err
}
if err := attachTracepoints(bpfModule); err != nil {
return err
}
// 4096 channel size, minimises event drops
ch := make(chan []byte, 4096)
rb, err := bpfModule.InitRingBuf("event_map", ch)
if err != nil {
return err
}
rb.Poll(300)
pprofDone := make(chan struct{})
var cpuProfile, memProfile *os.File
if flags.Get().PprofEnable {
if cpuProfile, err = os.Create("ior.cpuprofile"); err != nil {
return err
}
if memProfile, err = os.Create("ior.memprofile"); err != nil {
return err
}
pprof.StartCPUProfile(cpuProfile)
} else {
close(pprofDone)
}
el := newEventLoop()
duration := time.Duration(flags.Get().Duration) * time.Second
fmt.Println("Probing for", duration)
ctx, cancel := context.WithTimeout(context.Background(), duration)
signalCh := make(chan os.Signal, 1)
signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM)
go func() {
<-signalCh
fmt.Println("Received signal, shutting down...")
cancel()
}()
go func() {
<-ctx.Done()
fmt.Println(el.stats())
if flags.Get().PprofEnable {
fmt.Println("Stoppig profiling, writing ior.cpuprofile and ior.memprofile")
pprof.StopCPUProfile()
pprof.WriteHeapProfile(memProfile)
close(pprofDone)
}
}()
startTime := time.Now()
el.run(ctx, ch)
totalDuration := time.Since(startTime)
<-pprofDone
fmt.Println("Good bye... (unloading BPF tracepoints will take a few seconds...) after", totalDuration)
return nil
}
|
