selftests/bpf: Add bpf-nop benchmark for timing overhead baseline

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Add a minimal benchmark that measures the overhead of the batch-timing
infrastructure itself. The BPF program runs an empty BENCH_BPF_LOOP body
(~1.5-2 ns/op), establishing the floor cost that all timing-library
benchmarks include.

[root@virtme-ng tools/testing/selftests/bpf]# sudo ./bench -a -p8 bpf-nop
Setting up benchmark 'bpf-nop'...
Benchmark 'bpf-nop' started.
bpf-nop: median 1.82 ns/op, stddev 0.01, p99 1.86 (1754 samples)

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-4-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Puranjay Mohan 2026-04-27 16:23:00 -07:00 • committed by Alexei Starovoitov

parent 08158c111d

commit dcf11479c2

4 changed files with 102 additions and 0 deletions

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2

tools/testing/selftests/bpf/Makefile

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2

tools/testing/selftests/bpf/bench.c

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84

tools/testing/selftests/bpf/benchs/bench_bpf_nop.c

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14

tools/testing/selftests/bpf/progs/bpf_nop_bench.c

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