From: Arnaldo Carvalho de Melo Date: Sat, 2 May 2026 16:22:33 +0000 (-0300) Subject: perf session: Add byte-swap handler for PERF_RECORD_COMPRESSED2 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1c9d2ac2ead70d4d7c70e7f1276d68ca86e15fa4;p=thirdparty%2Flinux.git perf session: Add byte-swap handler for PERF_RECORD_COMPRESSED2 PERF_RECORD_COMPRESSED2 events carry a data_size field that must be byte-swapped when reading cross-endian perf.data files. Without a swap handler, reading COMPRESSED2 events on a different-endian machine would misinterpret data_size as a garbage value, causing the decompression path to read the wrong number of bytes. The compressed payload itself is a raw byte stream and needs no swapping. Fixes: 208c0e16834472bb ("perf record: Add 8-byte aligned event type PERF_RECORD_COMPRESSED2") Reported-by: sashiko-bot@kernel.org # Running on a local machine Reviewed-by: Ian Rogers Cc: Adrian Hunter Cc: Chun-Tse Shao Cc: Jiri Olsa Cc: Namhyung Kim Assisted-by: Claude:claude-opus-4.6-1m Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 8280413f4528f..9271885e3920f 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -1056,6 +1056,14 @@ static int perf_event__time_conv_swap(union perf_event *event, return 0; } +static int perf_event__compressed2_swap(union perf_event *event, + bool sample_id_all __maybe_unused) +{ + /* Only data_size needs swapping — compressed payload is a raw byte stream */ + event->pack2.data_size = bswap_64(event->pack2.data_size); + return 0; +} + static int perf_event__bpf_metadata_swap(union perf_event *event, bool sample_id_all __maybe_unused) { @@ -1197,6 +1205,7 @@ static perf_event__swap_op perf_event__swap_ops[] = { [PERF_RECORD_STAT_ROUND] = perf_event__stat_round_swap, [PERF_RECORD_EVENT_UPDATE] = perf_event__event_update_swap, [PERF_RECORD_TIME_CONV] = perf_event__time_conv_swap, + [PERF_RECORD_COMPRESSED2] = perf_event__compressed2_swap, [PERF_RECORD_BPF_METADATA] = perf_event__bpf_metadata_swap, [PERF_RECORD_SCHEDSTAT_CPU] = perf_event__schedstat_cpu_swap, [PERF_RECORD_SCHEDSTAT_DOMAIN] = perf_event__schedstat_domain_swap,