[PATCH V2 11/13] perf tools: introduce PERF_RECORD_USER_OVERHEAD

[kan.liang@intel.com]

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

It is used to track user space perf tool profiling time cost.

Signed-off-by: Kan Liang <kan.liang@intel.com>
---
 tools/perf/util/event.c   | 1 +
 tools/perf/util/event.h   | 5 +++++
 tools/perf/util/session.c | 4 ++++
 3 files changed, 10 insertions(+)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index e8736dc..764893c 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 a6c98ce..6110f32 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
 };
 
@@ -490,6 +491,10 @@ struct time_conv_event {
 	u64 time_zero;
 };
 
+enum perf_user_overhead_event_type { /* above any possible kernel type */
+	PERF_USER_OVERHEAD_TYPE_START	= 100,
+};
+
 struct perf_overhead {
 	struct perf_event_header	header;
 	u64				type;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 1dc32e3..7745bec 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,
 };
 
@@ -1387,6 +1388,9 @@ 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, -1);
+		return tool->overhead(tool, event, NULL, NULL);
 	default:
 		return -EINVAL;
 	}
-- 
2.5.5