perf trace: Sample timestamps as well

Before:

            perf-21082 [013]     0.000000: sched_wakeup_new: task perf:21083 [120] success=1 [015]
            perf-21082 [013]     0.000000: sched_migrate_task: task perf:21082 [120] from: 13  to: 15
            perf-21082 [013]     0.000000: sched_process_fork: parent perf:21082  child perf:21083
            true-21083 [015]     0.000000: sched_wakeup: task migration/15:33 [0] success=1 [015]
            perf-21082 [013]     0.000000: sched_switch: task perf:21082 [120] (S) ==> swapper:0 [140]
            true-21083 [015]     0.000000: sched_switch: task perf:21083 [120] (R) ==> migration/15:33 [0]
            true-21083 [011]     0.000000: sched_process_exit: task true:21083 [120]

After:

            perf-21082 [013] 14674.797613: sched_wakeup_new: task perf:21083 [120] success=1 [015]
            perf-21082 [013] 14674.797506: sched_migrate_task: task perf:21082 [120] from: 13  to: 15
            perf-21082 [013] 14674.797610: sched_process_fork: parent perf:21082  child perf:21083
            true-21083 [015] 14674.797725: sched_wakeup: task migration/15:33 [0] success=1 [015]
            perf-21082 [013] 14674.797722: sched_switch: task perf:21082 [120] (S) ==> swapper:0 [140]
            true-21083 [015] 14674.797729: sched_switch: task perf:21083 [120] (R) ==> migration/15:33 [0]
            true-21083 [011] 14674.798159: sched_process_exit: task true:21083 [120]

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/builtin-record.c

@@ -404,6 +404,7 @@ static void create_counter(int counter, int cpu, pid_t pid)
 		attr->sample_type	|= PERF_SAMPLE_CALLCHAIN;
 
 	if (raw_samples) {
+		attr->sample_type	|= PERF_SAMPLE_TIME;
 		attr->sample_type	|= PERF_SAMPLE_RAW;
 		attr->sample_type	|= PERF_SAMPLE_CPU;
 	}

tools/perf/builtin-trace.c

@@ -58,6 +58,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
 	struct dso *dso = NULL;
 	struct thread *thread;
 	u64 ip = event->ip.ip;
+	u64 timestamp = -1;
 	u32 cpu = -1;
 	u64 period = 1;
 	void *more_data = event->ip.__more_data;
@@ -65,6 +66,11 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
 
 	thread = threads__findnew(event->ip.pid, &threads, &last_match);
 
+	if (sample_type & PERF_SAMPLE_TIME) {
+		timestamp = *(u64 *)more_data;
+		more_data += sizeof(u64);
+	}
+
 	if (sample_type & PERF_SAMPLE_CPU) {
 		cpu = *(u32 *)more_data;
 		more_data += sizeof(u32);
@@ -127,7 +133,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
 		 * field, although it should be the same than this perf
 		 * event pid
 		 */
-		print_event(cpu, raw->data, raw->size, 0, thread->comm);
+		print_event(cpu, raw->data, raw->size, timestamp, thread->comm);
 	}
 	total += period;