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Subject[PATCH 5/7] perf session: don't rely on evlist in pipe mode
Date
Session sets a number parameters that rely on evlist. These parameters
are not used in pipe-mode and should not be set, since evlist is
unavailable. Fix that.

Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
---
tools/perf/util/session.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index a25302bc55a8..db554b7461b8 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -140,8 +140,14 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
if (perf_session__open(session) < 0)
goto out_close;

- perf_session__set_id_hdr_size(session);
- perf_session__set_comm_exec(session);
+ /*
+ * set session attributes that are present in perf.data
+ * but not in pipe-mode.
+ */
+ if (!file->is_pipe) {
+ perf_session__set_id_hdr_size(session);
+ perf_session__set_comm_exec(session);
+ }
}
} else {
session->machines.host.env = &perf_env;
@@ -156,7 +162,11 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
pr_warning("Cannot read kernel map\n");
}

- if (tool && tool->ordering_requires_timestamps &&
+ /*
+ * In pipe-mode, evlist is empty until PERF_RECORD_HEADER_ATTR is
+ * processed, so perf_evlist__sample_id_all is not meaningful here.
+ */
+ if (!file->is_pipe && tool && tool->ordering_requires_timestamps &&
tool->ordered_events && !perf_evlist__sample_id_all(session->evlist)) {
dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
tool->ordered_events = false;
--
2.12.2.715.g7642488e1d-goog
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