diff --git a/pkg/filesystemlayer/fsl_test.go b/pkg/filesystemlayer/fsl_test.go
index f89b9fa..426a309 100644
--- a/pkg/filesystemlayer/fsl_test.go
+++ b/pkg/filesystemlayer/fsl_test.go
@@ -9,7 +9,9 @@
 package filesystemlayer_test
 
 import (
+	"bytes"
 	"fmt"
+	"runtime"
 	"sync"
 	"testing"
 
@@ -110,3 +112,36 @@ func TestCase1(t *testing.T) {
 	err = fslCtx.Rename("/tmp/lal/hls/test1/1.ts", "/tmp/lal/hls/test1/new1.ts")
 	assert.Equal(t, filesystemlayer.ErrNotFound, err)
 }
+
+func TestFslMemory(t *testing.T) {
+	buf := bytes.Repeat([]byte("x"), 4096000)
+	var m runtime.MemStats
+
+	runtime.ReadMemStats(&m)
+	nazalog.Debugf("%+v", m)
+
+	fslCtx := filesystemlayer.FslFactory(filesystemlayer.FslTypeMemory)
+	fp, err := fslCtx.Create("./aaa/b1")
+	assert.Equal(t, nil, err)
+	_, err = fp.Write(buf)
+	assert.Equal(t, nil, err)
+
+	runtime.ReadMemStats(&m)
+	nazalog.Debugf("%+v", m)
+
+	fp2, err := fslCtx.Create("./aaa/b2")
+	assert.Equal(t, nil, err)
+	_, err = fp2.Write(buf)
+	assert.Equal(t, nil, err)
+
+	runtime.ReadMemStats(&m)
+	nazalog.Debugf("%+v", m)
+
+	err = fslCtx.RemoveAll("./aaa")
+	assert.Equal(t, nil, err)
+
+	runtime.GC()
+
+	runtime.ReadMemStats(&m)
+	nazalog.Debugf("%+v", m)
+}
diff --git a/pkg/filesystemlayer/memory.go b/pkg/filesystemlayer/memory.go
index 5b37b96..1e2a89f 100644
--- a/pkg/filesystemlayer/memory.go
+++ b/pkg/filesystemlayer/memory.go
@@ -107,6 +107,8 @@ func (f *FslMemory) WriteFile(filename string, data []byte, perm uint32) error {
 	return err
 }
 
+// ---------------------------------------------------------------------------------------------------------------------
+
 func (f *FslMemory) openFile(name string, flag int, perm uint32) (IFile, error) {
 	f.mu.Lock()
 	defer f.mu.Unlock()
@@ -121,6 +123,8 @@ func (f *FslMemory) openFile(name string, flag int, perm uint32) (IFile, error)
 	return fi, nil
 }
 
+// ---------------------------------------------------------------------------------------------------------------------
+
 func (f *file) Write(b []byte) (n int, err error) {
 	f.buf = append(f.buf, b...)
 	return len(b), nil