Re: [PATCH] perf buildid-list: Fix empty output for AUX data

[sashiko-bot@kernel.org]

> perf record enables buildid_all for AUX trace because buildid-list does
> not decode AUX data to identify hit DSOs. Historically those build IDs
> were available in HEADER_BUILD_ID, and buildid-list disabled hit
> filtering when HEADER_AUXTRACE was present.
> 
> Build IDs are now carried by MMAP2 records by default and the build-ID
> header is omitted. perf_session__list_build_ids() forces with_hits when
> the header is absent so that it processes the event stream. That also
> filters the result to DSOs referenced by ordinary samples. AUX data has
> no such samples unless the trace is decoded, so every DSO is dropped and
> perf archive reports that no build IDs were found.
> 
> Process the event stream whenever the build-ID header is absent,
> allowing MMAP2 build IDs to be read, but do not enable hit filtering for
> AUX data, this ensures that all build-IDs are included for AUX data.
> 
> Fixes: 6bd89ae7d147 ("perf record: Make sure to update build-ID cache")
> Assisted-by: Codex:GPT-5.6-Sol
> Signed-off-by: James Clark <james.clark@linaro.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260922-james-perf-aux-archive-v1-1-0ede8ed764ff@linaro.org?part=1