linux-kernel - [PATCH v3] perf report: Skip unsupported new event types

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Message-ID: <20250411174547.2208959-1-ctshao@google.com>
Date: Fri, 11 Apr 2025 10:45:21 -0700
From: Chun-Tse Shao <ctshao@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: Chun-Tse Shao <ctshao@...gle.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, 
	Namhyung Kim <namhyung@...nel.org>, peterz@...radead.org, mingo@...hat.com, 
	mark.rutland@....com, alexander.shishkin@...ux.intel.com, jolsa@...nel.org, 
	irogers@...gle.com, adrian.hunter@...el.com, kan.liang@...ux.intel.com, 
	dvyukov@...gle.com, ben.gainey@....com, linux-perf-users@...r.kernel.org
Subject: [PATCH v3] perf report: Skip unsupported new event types

`perf report` currently halts with an error when encountering
unsupported new event types (`event.type >= PERF_RECORD_HEADER_MAX`).
This patch modifies the behavior to skip these samples and continue
processing the remaining events. Additionally, stops reporting if the
new event size is not 8-byte aligned.

Signed-off-by: Chun-Tse Shao <ctshao@...gle.com>
Suggested-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Suggested-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/session.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 60fb9997ea0d..f55b2ac4e103 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1639,8 +1639,17 @@ static s64 perf_session__process_event(struct perf_session *session,
 	if (session->header.needs_swap)
 		event_swap(event, evlist__sample_id_all(evlist));
 
-	if (event->header.type >= PERF_RECORD_HEADER_MAX)
-		return -EINVAL;
+	if (event->header.type >= PERF_RECORD_HEADER_MAX) {
+		/* perf should not support unaligned event, stop here. */
+		if (event->header.size % sizeof(u64))
+			return -EINVAL;
+
+		/* This perf is outdated and does not support the latest event type. */
+		ui__warning("Unsupported type %u, please considering update perf.\n",
+			    event->header.type);
+		/* Skip unsupported/unaligned event by returning its size. */
+		return event->header.size;
+	}
 
 	events_stats__inc(&evlist->stats, event->header.type);
 
-- 
2.49.0.604.gff1f9ca942-goog