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authorMykola Lysenko <mykolal@fb.com>2022-03-08 12:04:47 -0800
committerAndrii Nakryiko <andrii@kernel.org>2022-03-08 17:39:28 -0800
commitd4b540544499d90ac81695e21e354cd5c82fa67e (patch)
treef3342707679848d8525ab111ca9c4f3b7870cfdf /tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
parent7fd9fd46a459272e641be78c1cc36baab1921fa1 (diff)
downloadlinux-d4b540544499d90ac81695e21e354cd5c82fa67e.tar.bz2
Improve perf related BPF tests (sample_freq issue)
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 <mykolal@fb.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20220308200449.1757478-2-mykolal@fb.com
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/bpf_cookie.c')
-rw-r--r--tools/testing/selftests/bpf/prog_tests/bpf_cookie.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
index cd10df6cd0fc..0612e79a9281 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
@@ -199,7 +199,7 @@ 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 = 4000;
+ attr.sample_freq = 1000;
pfd = syscall(__NR_perf_event_open, &attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC);
if (!ASSERT_GE(pfd, 0, "perf_fd"))
goto cleanup;