[PATCH 0/3] perf record: fix multi-record Zstd compression

[Dmitry Ilvokhin]

Patch 1 fixes a 'perf record -z' regression that aborts recording with
"Bad address" and produces an undecompressable perf.data.

While fixing it I found two more latent bugs in the same compressor,
zstd_compress_stream_to_records(): an output-buffer overrun and a broken
zstd-error fallback. Addressed in patches 2 and 3.

Dmitry Ilvokhin (3):
  perf record: Fix multiple PERF_RECORD_COMPRESSED2 records per push
  perf record: Avoid overrunning the zstd output buffer
  perf record: Don't store raw data on zstd compression failure

 tools/perf/builtin-record.c                   | 40 ++++++------
 .../record+zstd_comp_decomp_multi_record.sh   | 64 +++++++++++++++++++
 tools/perf/util/zstd.c                        | 15 +++--
 3 files changed, 94 insertions(+), 25 deletions(-)
 create mode 100755 tools/perf/tests/shell/record+zstd_comp_decomp_multi_record.sh

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2.53.0-Meta