perf session: Add ability to 'skip' a non-piped event stream

A piped event stream may contain arbitary sized tracepoint information
following a PERF_RECORD_HEADER_TRACING_DATA event.  The position in the
stream has to be 'skipped' to match the start of the next event.

Provide the same ability to a non-piped event stream to allow for
Instruction Trace data that may also be in a non-piped event stream.

Signed-off-by: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: ahunter6

tools/perf/util/session.c

@@ -1284,6 +1284,7 @@ int __perf_session__process_events(struct perf_session *session,
 	union perf_event *event;
 	uint32_t size;
 	struct ui_progress prog;
+	int skip;
 
 	perf_tool__fill_defaults(tool);
 
@@ -1344,14 +1345,18 @@ int __perf_session__process_events(struct perf_session *session,
 	size = event->header.size;
 
 	if (size < sizeof(struct perf_event_header) ||
-	    perf_session__process_event(session, event, tool, file_pos) < 0) {
+	    (skip = perf_session__process_event(session, event, tool, file_pos))
+									< 0) {
 		pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
 		       file_offset + head, event->header.size,
 		       event->header.type);
 		err = -EINVAL;
 		goto out_err;
 	}
 
+	if (skip)
+		size += skip;
+
 	head += size;
 	file_pos += size;