perf session: Add facility to peek at all events

AUX area samples are not limited in how far back in time the sample
could start. Consequently samples must be queued in advance to allow for
time-ordered processing. To achieve that, add
perf_session__peek_events() that walks and peeks at all the events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20191115124225.5247-11-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 33 insertions, 0 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index ab4dae1efea3..d0d7d25b23e3 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1659,6 +1659,34 @@ out_parse_sample:
 	return 0;
 }
 
+int perf_session__peek_events(struct perf_session *session, u64 offset,
+			      u64 size, peek_events_cb_t cb, void *data)
+{
+	u64 max_offset = offset + size;
+	char buf[PERF_SAMPLE_MAX_SIZE];
+	union perf_event *event;
+	int err;
+
+	do {
+		err = perf_session__peek_event(session, offset, buf,
+					       PERF_SAMPLE_MAX_SIZE, &event,
+					       NULL);
+		if (err)
+			return err;
+
+		err = cb(session, event, offset, data);
+		if (err)
+			return err;
+
+		offset += event->header.size;
+		if (event->header.type == PERF_RECORD_AUXTRACE)
+			offset += event->auxtrace.size;
+
+	} while (offset < max_offset);
+
+	return err;
+}
+
 static s64 perf_session__process_event(struct perf_session *session,
 				       union perf_event *event, u64 file_offset)
 {
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 8456e1d868fd..f76480166d38 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -64,6 +64,11 @@ int perf_session__peek_event(struct perf_session *session, off_t file_offset,
 			     void *buf, size_t buf_sz,
 			     union perf_event **event_ptr,
 			     struct perf_sample *sample);
+typedef int (*peek_events_cb_t)(struct perf_session *session,
+				union perf_event *event, u64 offset,
+				void *data);
+int perf_session__peek_events(struct perf_session *session, u64 offset,
+			      u64 size, peek_events_cb_t cb, void *data);
 
 int perf_session__process_events(struct perf_session *session);