[update] trace version + todo

runtime/src/kaapi_trace.h

@@ -225,12 +225,16 @@ typedef struct kaapi_named_perfctr {
    Version 6 is not uppercompatible with older versions.
    Version 7 is not uppercompatible with older versions and correspond to version integrated 
    in libomp.
+   Version 9 add loop information, memory event, perf counter.
 */
-#define __KAAPI_TRACE_VERSION__     8
+#define __KAAPI_TRACE_VERSION__     9
 
 /** Definition of internal KAAPI events.
     Not that any extension or modification of the events must
     be reflected in the utility bin/kaapi_event_reader.
+
+    TODO: reduce the size of event by encoding information in extra field: e.g. begin / end
+    of state, or group events by features and then used extra fields for number of subevent
 */
 #define KAAPI_EVT_KPROC_START        0     /* kproc begins, i0: processor type (0:CPU, 1:GPU) */
 #define KAAPI_EVT_KPROC_STOP         1     /* kproc ends */