perf stat record: Initialize record features

Disabling all non stat related features.

Also as we now enable STAT feature in the data file, adding code to
instruct session open to skip sample type checking for stat data files.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1446734469-11352-4-git-send-email-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

@@ -1310,6 +1310,19 @@ static const char * const recort_usage[] = {
 	NULL,
 };
 
+static void init_features(struct perf_session *session)
+{
+	int feat;
+
+	for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
+		perf_header__set_feat(&session->header, feat);
+
+	perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
+	perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
+	perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
+	perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
+}
+
 static int __cmd_record(int argc, const char **argv)
 {
 	struct perf_session *session;
@@ -1331,6 +1344,8 @@ static int __cmd_record(int argc, const char **argv)
 	if (perf_stat.file.is_pipe)
 		return -EINVAL;
 
+	init_features(session);
+
 	session->evlist   = evsel_list;
 	perf_stat.session = session;
 	perf_stat.record  = true;

tools/perf/util/session.c

@@ -37,6 +37,9 @@ static int perf_session__open(struct perf_session *session)
 	if (perf_data_file__is_pipe(file))
 		return 0;
 
+	if (perf_header__has_feat(&session->header, HEADER_STAT))
+		return 0;
+
 	if (!perf_evlist__valid_sample_type(session->evlist)) {
 		pr_err("non matching sample_type\n");
 		return -1;