[PATCH] selftests/bpf: Add perfbuf multi-producer benchmark

[Gyutae Bae <gyutae.opensource@navercorp.com>]

From: Gyutae Bae <gyutae.bae@navercorp.com>

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>
---
 tools/testing/selftests/bpf/benchs/run_bench_ringbufs.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/bpf/benchs/run_bench_ringbufs.sh b/tools/testing/selftests/bpf/benchs/run_bench_ringbufs.sh
index 83e05e837871..123b7feb6935 100755
--- a/tools/testing/selftests/bpf/benchs/run_bench_ringbufs.sh
+++ b/tools/testing/selftests/bpf/benchs/run_bench_ringbufs.sh
@@ -49,6 +49,11 @@ for b in 1 2 3 4 8 12 16 20 24 28 32 36 40 44 48 52; do
 	summarize "rb-libbpf nr_prod $b" "$($RUN_RB_BENCH -p$b --rb-batch-cnt 50 rb-libbpf)"
 done
 
+header "Perfbuf, multi-producer"
+for b in 1 2 3 4 8 12 16 20 24 28 32 36 40 44 48 52; do
+	summarize "pb-libbpf nr_prod $b" "$($RUN_RB_BENCH -p$b --rb-batch-cnt 50 --rb-sample-rate 50 pb-libbpf)"
+done
+
 header "Ringbuf, multi-producer contention in overwrite mode, no consumer"
 for b in 1 2 3 4 8 12 16 20 24 28 32 36 40 44 48 52; do
 	summarize "rb-prod nr_prod $b" "$($RUN_BENCH -p$b --rb-batch-cnt 50 --rb-overwrite --rb-bench-producer rb-libbpf)"
-- 
2.39.5 (Apple Git-154)