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Add a multi-producer benchmark for perfbuf to complement the existing ringbuf multi-producer test. Unlike ringbuf which uses a shared buffer and experiences contention, perfbuf uses per-CPU buffers so the test measures scaling behavior rather than contention. This allows developers to compare perfbuf vs ringbuf performance under multi-producer workloads when choosing between the two for their systems. Signed-off-by: Gyutae Bae <gyutae.bae@navercorp.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260120090716.82927-1-gyutae.opensource@navercorp.com