From 020a32d9581ac824d038b0b4e24e977e3cc8589f Mon Sep 17 00:00:00 2001 From: Yonghong Song Date: Thu, 5 Oct 2017 09:19:21 -0700 Subject: bpf: add a test case for helper bpf_perf_event_read_value The bpf sample program tracex6 is enhanced to use the new helper to read enabled/running time as well. Signed-off-by: Yonghong Song Acked-by: Alexei Starovoitov Acked-by: Daniel Borkmann Signed-off-by: David S. Miller --- samples/bpf/tracex6_user.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'samples/bpf/tracex6_user.c') diff --git a/samples/bpf/tracex6_user.c b/samples/bpf/tracex6_user.c index a05a99a0752f..3341a96fc046 100644 --- a/samples/bpf/tracex6_user.c +++ b/samples/bpf/tracex6_user.c @@ -22,6 +22,7 @@ static void check_on_cpu(int cpu, struct perf_event_attr *attr) { + struct bpf_perf_event_value value2; int pmu_fd, error = 0; cpu_set_t set; __u64 value; @@ -46,8 +47,18 @@ static void check_on_cpu(int cpu, struct perf_event_attr *attr) fprintf(stderr, "Value missing for CPU %d\n", cpu); error = 1; goto on_exit; + } else { + fprintf(stderr, "CPU %d: %llu\n", cpu, value); + } + /* The above bpf_map_lookup_elem should trigger the second kprobe */ + if (bpf_map_lookup_elem(map_fd[2], &cpu, &value2)) { + fprintf(stderr, "Value2 missing for CPU %d\n", cpu); + error = 1; + goto on_exit; + } else { + fprintf(stderr, "CPU %d: counter: %llu, enabled: %llu, running: %llu\n", cpu, + value2.counter, value2.enabled, value2.running); } - fprintf(stderr, "CPU %d: %llu\n", cpu, value); on_exit: assert(bpf_map_delete_elem(map_fd[0], &cpu) == 0 || error); -- cgit v1.2.3-55-g7522