diff options
author | Song Liu <song@kernel.org> | 2023-04-13 00:04:21 +0300 |
---|---|---|
committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-04-13 15:32:04 +0300 |
commit | de6d014a09bf12a9a8959d60c0a1d4a41d394a89 (patch) | |
tree | 3c6c5aadb6209a77bc78dd07b27f1b676682fc82 /tools/testing/selftests/bpf/testing_helpers.c | |
parent | 5a674611d116a5fc28c5429beea2b78c6e2933ef (diff) | |
download | linux-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.c | 20 |
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; +} |