diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 2d542368de3..da8f67483ae 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1204,13 +1204,13 @@ static void output_lat_thread(struct work_atoms *work_list)
 	/*
 	 * Ignore idle threads:
 	 */
-	if (!work_list->thread->pid)
+	if (!strcmp(work_list->thread->comm, "swapper"))
 		return;
 
 	all_runtime += work_list->total_runtime;
 	all_count += work_list->nb_atoms;
 
-	ret = printf("  %s-%d ", work_list->thread->comm, work_list->thread->pid);
+	ret = printf("  %s:%d ", work_list->thread->comm, work_list->thread->pid);
 
 	for (i = 0; i < 24 - ret; i++)
 		printf(" ");
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 7635928ca27..12c4341078f 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -85,7 +85,7 @@ register_idle_thread(struct rb_root *threads, struct thread **last_match)
 {
 	struct thread *thread = threads__findnew(0, threads, last_match);
 
-	if (!thread || thread__set_comm(thread, "[init]")) {
+	if (!thread || thread__set_comm(thread, "swapper")) {
 		fprintf(stderr, "problem inserting idle task.\n");
 		exit(-1);
 	}