linux-kernel - [PATCH 1/2] perf session: Add ability to 'skip' a non-piped event stream

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Date:	Wed, 23 Jul 2014 22:19:57 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] 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 <adrian.hunter@...el.com>
---
 tools/perf/util/session.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 8aa1be1..9d468e6 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1320,6 +1320,7 @@ 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);
 
@@ -1380,7 +1381,8 @@ more:
 	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);
@@ -1388,6 +1390,9 @@ more:
 		goto out_err;
 	}
 
+	if (skip)
+		size += skip;
+
 	head += size;
 	file_pos += size;
 
-- 
1.8.3.2

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