perf record: Return the written size from process_comp_header()

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process_comp_header() is called from zstd_compress_stream_to_records()
twice per record: once with data_size == 0 to write the record header,
and once with the payload size to finalize it. It returns the increment
it was passed, and the loop separately decides whether a record still
fits by comparing the remaining 'dst_size' against the header size.

With the fit check split from the code that writes the record,
process_comp_header() cannot reject a record on its own, so any bytes it
writes into 'dst' have to be bounds-checked by the caller instead of
where they are produced.

Pass the space left in 'dst' to process_comp_header(), let it return the
number of bytes written or -1 when the header does not fit, and account
the compressed payload in the loop.

No functional change intended.

Signed-off-by: Dmitry Ilvokhin <d@ilvokhin.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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This commit is contained in:

Dmitry Ilvokhin 2026-07-08 13:38:33 +00:00 • committed by Namhyung Kim

parent e83fd0f637

commit 757155c142

3 changed files with 31 additions and 17 deletions

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17

tools/perf/builtin-record.c

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6

tools/perf/util/compress.h

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25

tools/perf/util/zstd.c

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