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authorSong Liu <song@kernel.org>2023-04-13 00:04:21 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2023-04-13 15:32:04 +0300
commitde6d014a09bf12a9a8959d60c0a1d4a41d394a89 (patch)
tree3c6c5aadb6209a77bc78dd07b27f1b676682fc82 /tools/testing/selftests/bpf/testing_helpers.c
parent5a674611d116a5fc28c5429beea2b78c6e2933ef (diff)
downloadlinux-de6d014a09bf12a9a8959d60c0a1d4a41d394a89.tar.xz
selftests/bpf: Use read_perf_max_sample_freq() in perf_event_stackmap
Currently, perf_event sample period in perf_event_stackmap is set too low that the test fails randomly. Fix this by using the max sample frequency, from read_perf_max_sample_freq(). Move read_perf_max_sample_freq() to testing_helpers.c. Replace the CHECK() with if-printf, as CHECK is not available in testing_helpers.c. Fixes: 1da4864c2b20 ("selftests/bpf: Add callchain_stackid") Signed-off-by: Song Liu <song@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20230412210423.900851-2-song@kernel.org
Diffstat (limited to 'tools/testing/selftests/bpf/testing_helpers.c')
-rw-r--r--tools/testing/selftests/bpf/testing_helpers.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/testing_helpers.c b/tools/testing/selftests/bpf/testing_helpers.c
index ecfea13f938b..0b5e0829e5be 100644
--- a/tools/testing/selftests/bpf/testing_helpers.c
+++ b/tools/testing/selftests/bpf/testing_helpers.c
@@ -229,3 +229,23 @@ int bpf_test_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
return bpf_prog_load(type, NULL, license, insns, insns_cnt, &opts);
}
+
+__u64 read_perf_max_sample_freq(void)
+{
+ __u64 sample_freq = 5000; /* fallback to 5000 on error */
+ FILE *f;
+
+ f = fopen("/proc/sys/kernel/perf_event_max_sample_rate", "r");
+ if (f == NULL) {
+ printf("Failed to open /proc/sys/kernel/perf_event_max_sample_rate: err %d\n"
+ "return default value: 5000\n", -errno);
+ return sample_freq;
+ }
+ if (fscanf(f, "%llu", &sample_freq) != 1) {
+ printf("Failed to parse /proc/sys/kernel/perf_event_max_sample_rate: err %d\n"
+ "return default value: 5000\n", -errno);
+ }
+
+ fclose(f);
+ return sample_freq;
+}