selftests/bpf: Add attach bench test

2022-05-10T21:42:06Z

Adding test that reads all functions from ftrace available_filter_functions file and attach them all through kprobe_multi API. It also prints stats info with -v option, like on my setup: test_bench_attach: found 48712 functions test_bench_attach: attached in 1.069s test_bench_attach: detached in 0.373s Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20220510122616.2652285-6-jolsa@kernel.org Signed-off-by: Alexei Starovoitov

kernel/tools/testing/selftests/bpf/progs/kprobe_multi_empty.c, branch linux-6.2.y

selftests/bpf: Add attach bench test