bpf_cookie and find_vma are flaky in nested VMs, which is used by some CI systems. It turns out these failures are caused by unreliable perf event in nested VM. Fix these by: 1. Use PERF_COUNT_SW_CPU_CLOCK in find_vma; 2. Increase sample_freq in bpf_cookie. Signed-off-by: Song Liu <song@xxxxxxxxxx> --- tools/testing/selftests/bpf/prog_tests/bpf_cookie.c | 2 +- tools/testing/selftests/bpf/prog_tests/find_vma.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c index 4407ea428e77..070c52c312e5 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c @@ -451,7 +451,7 @@ static void pe_subtest(struct test_bpf_cookie *skel) attr.type = PERF_TYPE_SOFTWARE; attr.config = PERF_COUNT_SW_CPU_CLOCK; attr.freq = 1; - attr.sample_freq = 1000; + attr.sample_freq = 10000; pfd = syscall(__NR_perf_event_open, &attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC); if (!ASSERT_GE(pfd, 0, "perf_fd")) goto cleanup; diff --git a/tools/testing/selftests/bpf/prog_tests/find_vma.c b/tools/testing/selftests/bpf/prog_tests/find_vma.c index 5165b38f0e59..f7619e0ade10 100644 --- a/tools/testing/selftests/bpf/prog_tests/find_vma.c +++ b/tools/testing/selftests/bpf/prog_tests/find_vma.c @@ -29,8 +29,8 @@ static int open_pe(void) /* create perf event */ attr.size = sizeof(attr); - attr.type = PERF_TYPE_HARDWARE; - attr.config = PERF_COUNT_HW_CPU_CYCLES; + attr.type = PERF_TYPE_SOFTWARE; + attr.config = PERF_COUNT_SW_CPU_CLOCK; attr.freq = 1; attr.sample_freq = 1000; pfd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, PERF_FLAG_FD_CLOEXEC); -- 2.43.0
