switch from perf maps to ring buffer

1 files changed, 7 insertions, 12 deletions

diff --git a/internal/flags/flags.go b/internal/flags/flags.go
index 1ba9d60..ac7abd4 100644
--- a/internal/flags/flags.go
+++ b/internal/flags/flags.go
@@ -9,15 +9,13 @@ import (
 )
 
 type Flags struct {
-	UidFilter        int
-	FdEventMapSize   int
-	OpenEventMapSize int
+	UidFilter    int
+	EventMapSize int
 }
 
 func New() (flags Flags) {
 	flag.IntVar(&flags.UidFilter, "uid", 0, "Filter for processes with UID")
-	flag.IntVar(&flags.FdEventMapSize, "fdMapSize", 4096, "BPF FD event map size")
-	flag.IntVar(&flags.OpenEventMapSize, "openMapSize", 1024, "BPF open event map size")
+	flag.IntVar(&flags.EventMapSize, "mapSize", 4096, "BPF FD event ring buffer map size")
 	flag.Parse()
 	return flags
 }
@@ -39,17 +37,14 @@ func (flags Flags) SetBPF(bpfModule *bpf.Module) error {
 }
 
 func (flags Flags) ResizeBPFMaps(bpfModule *bpf.Module) error {
-	if err := resizeBPFMap(bpfModule, "open_event_map", uint32(flags.OpenEventMapSize)); err != nil {
-		return err
-	}
-	if err := resizeBPFMap(bpfModule, "fd_event_map", uint32(flags.FdEventMapSize)); err != nil {
-		return err
+	if err := resizeBPFMap(bpfModule, "event_map", uint32(flags.EventMapSize)); err != nil {
+		return fmt.Errorf("event_map: %w", err)
 	}
 	return nil
 }
 
 func resizeBPFMap(module *bpf.Module, name string, size uint32) error {
-	m, err := module.GetMap("open_event_map")
+	m, err := module.GetMap(name)
 	if err != nil {
 		return err
 	}
@@ -59,7 +54,7 @@ func resizeBPFMap(module *bpf.Module, name string, size uint32) error {
 	}
 
 	if actual := m.MaxEntries(); actual != size {
-		return fmt.Errorf("map resize failed, expected %v, actual %v", size, actual)
+		return fmt.Errorf("map resize to %d failed, expected %v, actual %v", size, size, actual)
 	}
 
 	return nil