gobgpd: support force GC and return free memory to OS

Sending signal USR1 to run GC and return free memory to OS. It's for
debugging memory leak.

Maybe we could support this feature via the GRPC API.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 5 insertions, 1 deletions

diff --git a/gobgpd/main.go b/gobgpd/main.go
index 05c20555..15ad1a56 100644
--- a/gobgpd/main.go
+++ b/gobgpd/main.go
@@ -30,13 +30,14 @@ import (
 	"os"
 	"os/signal"
 	"runtime"
+	"runtime/debug"
 	"strings"
 	"syscall"
 )
 
 func main() {
 	sigCh := make(chan os.Signal, 1)
-	signal.Notify(sigCh, syscall.SIGHUP, syscall.SIGTERM)
+	signal.Notify(sigCh, syscall.SIGHUP, syscall.SIGTERM, syscall.SIGUSR1)
 
 	var opts struct {
 		ConfigFile      string `short:"f" long:"config-file" description:"specifying a config file"`
@@ -260,6 +261,9 @@ func main() {
 				reloadCh <- true
 			case syscall.SIGKILL, syscall.SIGTERM:
 				bgpServer.Shutdown()
+			case syscall.SIGUSR1:
+				runtime.GC()
+				debug.FreeOSMemory()
 			}
 		}
 	}