diff --git a/ebpf/gmon.go b/ebpf/gmon.go
index cfd5048..4dc860d 100644
--- a/ebpf/gmon.go
+++ b/ebpf/gmon.go
@@ -1,14 +1,10 @@
 package ebpf
 
 import (
-	"bufio"
 	"context"
 	"errors"
 	"fmt"
-	"io/fs"
 	"log/slog"
-	"os"
-	"strings"
 
 	"github.com/cilium/ebpf"
 	"github.com/cilium/ebpf/link"
@@ -28,7 +24,6 @@ func Run(ctx context.Context, config Config) (func(), error) {
 	if err != nil {
 		return func() {}, err
 	}
-	go logTracePipe(ctx.Done())
 	ex, err := link.OpenExecutable(config.binPath)
 	if err != nil {
 		return func() {}, err
@@ -117,30 +112,3 @@ func linkUprobe(
 	slog.Debug("attach uprobe with address", slog.String("symbol", symbol), slog.String("address", fmt.Sprintf("%#x", address)))
 	return l, nil
 }
-
-func logTracePipe(done <-chan struct{}) {
-	tracePipe, err := os.Open("/sys/kernel/debug/tracing/trace_pipe")
-	if err != nil {
-		slog.Error("open trace_pipe", slog.Any("error", err))
-		return
-	}
-	defer tracePipe.Close()
-
-	go func() {
-		// Create a bufio.Scanner to read the trace data.
-		scanner := bufio.NewScanner(tracePipe)
-		// Read and print the trace data.
-		for scanner.Scan() {
-			msg := strings.TrimSpace(scanner.Text())
-			if strings.Contains(msg, "gmon") {
-				slog.Warn(msg)
-			}
-		}
-		if err := scanner.Err(); err != nil {
-			if !errors.Is(err, fs.ErrClosed) {
-				slog.Error("read trace_pipe", slog.Any("error", err))
-			}
-		}
-	}()
-	<-done
-}
diff --git a/main.go b/main.go
index a295ce9..6d944d3 100644
--- a/main.go
+++ b/main.go
@@ -1,9 +1,12 @@
 package main
 
 import (
+	"bufio"
 	"context"
+	"errors"
 	"flag"
 	"fmt"
+	"io/fs"
 	"log"
 	"log/slog"
 	"net/http"
@@ -12,6 +15,7 @@ import (
 	"os/signal"
 	"runtime"
 	"runtime/trace"
+	"strings"
 
 	"github.com/cilium/ebpf/rlimit"
 	"github.com/keisku/gmon/ebpf"
@@ -96,6 +100,9 @@ func main() {
 	if err != nil {
 		errlog.Fatalln(err)
 	}
+	if levelMap[*level] == slog.LevelDebug {
+		go logTracePipe(ctx.Done())
+	}
 	if 1023 < *pprofPort {
 		go func() {
 			_ = http.ListenAndServe(fmt.Sprintf("127.0.0.1:%d", pprofPort), nil)
@@ -105,3 +112,28 @@ func main() {
 	slog.Debug("gmon exits")
 	eBPFClose()
 }
+
+func logTracePipe(done <-chan struct{}) {
+	tracePipe, err := os.Open("/sys/kernel/debug/tracing/trace_pipe")
+	if err != nil {
+		slog.Error("open trace_pipe", slog.Any("error", err))
+		return
+	}
+	defer tracePipe.Close()
+
+	go func() {
+		scanner := bufio.NewScanner(tracePipe)
+		for scanner.Scan() {
+			msg := strings.TrimSpace(scanner.Text())
+			if strings.Contains(msg, "gmon") {
+				slog.Debug(msg)
+			}
+		}
+		if err := scanner.Err(); err != nil {
+			if !errors.Is(err, fs.ErrClosed) {
+				slog.Error("read trace_pipe", slog.Any("error", err))
+			}
+		}
+	}()
+	<-done
+}