tools: Flush stdout explicitly in event loop
diff --git a/tools/mountsnoop.py b/tools/mountsnoop.py
index a6d7ece..d186602 100755
--- a/tools/mountsnoop.py
+++ b/tools/mountsnoop.py
@@ -420,6 +420,7 @@
                 print('{:16} {:<7} {:<7} {:<11} {}'.format(
                     syscall['comm'].decode('utf-8', 'replace'), syscall['tgid'],
                     syscall['pid'], syscall['mnt_ns'], call))
+        sys.stdout.flush()
     except KeyError:
         # This might happen if we lost an event.
         pass