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perf record: Ensure space for lost samples

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Previous allocation didn't account for sample ID written after the
lost samples event. Switch from malloc/free to a stack allocation.

Reported-by: Milian Wolff <milian.wolff@kdab.com>
Closes: https://lore.kernel.org/linux-perf-users/23879991.0LEYPuXRzz@milian-workstation/
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240611050626.1223155-1-irogers@google.com
This commit is contained in:
Ian Rogers
2024-06-10 22:06:26 -07:00
committed by Namhyung Kim
parent 6828d6929b
commit 6c1785cd75
2 changed files with 15 additions and 25 deletions
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tools/lib/perf/include/perf/event.h
+6
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@@ -77,6 +77,12 @@ struct perf_record_lost_samples {
__u64 lost;
};
#define MAX_ID_HDR_ENTRIES 6
struct perf_record_lost_samples_and_ids {
struct perf_record_lost_samples lost;
__u64 sample_ids[MAX_ID_HDR_ENTRIES];
};
/*
* PERF_FORMAT_ENABLED | PERF_FORMAT_RUNNING | PERF_FORMAT_ID | PERF_FORMAT_LOST
*/