perf/bpf: Allow a BPF program to suppress all sample side effects

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Returning zero from a BPF program attached to a perf event already
suppresses any data output. Return early from __perf_event_overflow() in
this case so it will also suppress event_limit accounting, SIGTRAP
generation, and F_ASYNC signalling.

Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240412015019.7060-7-khuey@kylehuey.com

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Kyle Huey 2024-04-11 18:50:18 -07:00 • committed by Ingo Molnar

parent 76f6d58845

commit c4fcc7d1f4

1 changed files with 4 additions and 2 deletions

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kernel/events/core.c

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