diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 3e00323..2ce87ef 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -116,6 +116,8 @@
 static u64			run_avg;
 
 static unsigned long		replay_repeat = 10;
+static unsigned long		nr_timestamps;
+static unsigned long		unordered_timestamps;
 
 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
 
@@ -1109,8 +1111,11 @@
 	if (atom->state != THREAD_SLEEPING)
 		return;
 
-	if (atom->sched_out_time > timestamp)
+	nr_timestamps++;
+	if (atom->sched_out_time > timestamp) {
+		unordered_timestamps++;
 		return;
+	}
 
 	atom->state = THREAD_WAIT_CPU;
 	atom->wake_up_time = timestamp;
@@ -1130,6 +1135,11 @@
 
 	if (!atom_list->nb_atoms)
 		return;
+	/*
+	 * Ignore idle threads:
+	 */
+	if (!atom_list->thread->pid)
+		return;
 
 	all_runtime += atom_list->total_runtime;
 	all_count += atom_list->nb_atoms;
@@ -1301,8 +1311,16 @@
 	}
 
 	printf("-----------------------------------------------------------------------------------\n");
-	printf(" TOTAL:            |%9.3f ms |%9Ld |\n",
+	printf(" TOTAL:            |%9.3f ms |%9Ld |",
 		(double)all_runtime/1e6, all_count);
+
+	if (unordered_timestamps && nr_timestamps) {
+		printf(" INFO: %.2f%% unordered events.\n",
+			(double)unordered_timestamps/(double)nr_timestamps*100.0);
+	} else {
+		printf("\n");
+	}
+
 	printf("---------------------------------------------\n");
 }
 
@@ -1667,12 +1685,13 @@
 	"-a",
 	"-R",
 	"-M",
-	"-g",
+	"-f",
 	"-c", "1",
 	"-e", "sched:sched_switch:r",
 	"-e", "sched:sched_stat_wait:r",
 	"-e", "sched:sched_stat_sleep:r",
 	"-e", "sched:sched_stat_iowait:r",
+	"-e", "sched:sched_stat_runtime:r",
 	"-e", "sched:sched_process_exit:r",
 	"-e", "sched:sched_process_fork:r",
 	"-e", "sched:sched_wakeup:r",