[PATCH 10/14] perf tools: introduce PERF_RECORD_USER_OVERHEAD

[kan.liang@intel.com]

From: Kan Liang <kan.liang@intel.com>

User space perf tool also bring overhead. Introduce
PERF_RECORD_USER_OVERHEAD to track the overhead information.

Signed-off-by: Kan Liang <kan.liang@intel.com>
---
 tools/perf/util/event.c   | 1 +
 tools/perf/util/event.h   | 1 +
 tools/perf/util/session.c | 4 ++++
 3 files changed, 6 insertions(+)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index ca98c4c..6cd43c9 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -48,6 +48,7 @@ static const char *perf_event__names[] = {
 	[PERF_RECORD_STAT_ROUND]		= "STAT_ROUND",
 	[PERF_RECORD_EVENT_UPDATE]		= "EVENT_UPDATE",
 	[PERF_RECORD_TIME_CONV]			= "TIME_CONV",
+	[PERF_RECORD_USER_OVERHEAD]		= "USER_OVERHEAD",
 };
 
 const char *perf_event__name(unsigned int id)
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 3357529..1ef1a9d 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -237,6 +237,7 @@ enum perf_user_event_type { /* above any possible kernel type */
 	PERF_RECORD_STAT_ROUND			= 77,
 	PERF_RECORD_EVENT_UPDATE		= 78,
 	PERF_RECORD_TIME_CONV			= 79,
+	PERF_RECORD_USER_OVERHEAD		= 80,
 	PERF_RECORD_HEADER_MAX
 };
 
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index e3aa9d7..27a5c8a 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -804,6 +804,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
 	[PERF_RECORD_STAT_ROUND]	  = perf_event__stat_round_swap,
 	[PERF_RECORD_EVENT_UPDATE]	  = perf_event__event_update_swap,
 	[PERF_RECORD_TIME_CONV]		  = perf_event__all64_swap,
+	[PERF_RECORD_USER_OVERHEAD]	  = perf_event__all64_swap,
 	[PERF_RECORD_HEADER_MAX]	  = NULL,
 };
 
@@ -1382,6 +1383,9 @@ static s64 perf_session__process_user_event(struct perf_session *session,
 	case PERF_RECORD_TIME_CONV:
 		session->time_conv = event->time_conv;
 		return tool->time_conv(tool, event, session);
+	case PERF_RECORD_USER_OVERHEAD:
+		overhead_stats_update(tool, session->evlist, event);
+		return tool->overhead(tool, event, NULL, NULL);
 	default:
 		return -EINVAL;
 	}
-- 
2.5.5