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

[kan . liang]

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

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

Signed-off-by: Kan Liang <kan.li...@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