diff -p -up sreadahead-1.0/sreadahead.c.ftrace_printk sreadahead-1.0/sreadahead.c
--- sreadahead-1.0/sreadahead.c.ftrace_printk	2009-01-30 12:08:45.000000000 +0100
+++ sreadahead-1.0/sreadahead.c	2009-01-30 12:10:07.000000000 +0100
@@ -409,6 +409,14 @@ static void trace_start(void)
 	fprintf(file, "open");
 	fclose(file);
 
+	file = fopen("tracing/iter_ctrl", "w");
+	if (!file) {
+		perror("Unable to control iteration\n");
+		exit(EXIT_FAILURE);
+	}
+	fprintf(file, "ftrace_printk");
+	fclose(file);
+
 	file = fopen("tracing/current_tracer", "r");
 	fgets(buf, 4096, file);
 	fclose(file);