kernel/tools/testing/selftests/bpf/prog_tests/perf_branches.c, branch linux-6.2.y

Improve perf related BPF tests (sample_freq issue)

2022-03-09T01:39:28Z

Linux kernel may automatically reduce kernel.perf_event_max_sample_rate value when running tests in parallel on slow systems. Linux kernel checks against this limit when opening perf event with freq=1 parameter set. The lower bound is 1000. This patch reduces sample_freq value to 1000 in all BPF tests that use sample_freq to ensure they always can open perf event. Signed-off-by: Mykola Lysenko Signed-off-by: Andrii Nakryiko Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20220308200449.1757478-2-mykolal@fb.com

selftests/bpf: Turn on libbpf 1.0 mode and fix all IS_ERR checks

2021-05-26T00:32:35Z

Turn ony libbpf 1.0 mode. Fix all the explicit IS_ERR checks that now will be broken because libbpf returns NULL on error (and sets errno). Fix ASSERT_OK_PTR and ASSERT_ERR_PTR to work for both old mode and new modes and use them throughout selftests. This is trivial to do by using libbpf_get_error() API that all libbpf users are supposed to use, instead of IS_ERR checks. A bunch of checks also did explicit -1 comparison for various fd-returning APIs. Such checks are replaced with >= 0 or < 0 cases. There were also few misuses of bpf_object__find_map_by_name() in test_maps. Those are fixed in this patch as well. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Acked-by: John Fastabend Acked-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/bpf/20210525035935.1461796-3-andrii@kernel.org

selftests/bpf: Add bpf_read_branch_records() selftest

2020-02-19T23:01:07Z

Add a selftest to test: * default bpf_read_branch_records() behavior * BPF_F_GET_BRANCH_RECORDS_SIZE flag behavior * error path on non branch record perf events * using helper to write to stack * using helper to write to global On host with hardware counter support: # ./test_progs -t perf_branches #27/1 perf_branches_hw:OK #27/2 perf_branches_no_hw:OK #27 perf_branches:OK Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED On host without hardware counter support (VM): # ./test_progs -t perf_branches #27/1 perf_branches_hw:OK #27/2 perf_branches_no_hw:OK #27 perf_branches:OK Summary: 1/2 PASSED, 1 SKIPPED, 0 FAILED Also sync tools/include/uapi/linux/bpf.h. Signed-off-by: Daniel Xu Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200218030432.4600-3-dxu@dxuuu.xyz