diff options
| author | Yonghong Song <yhs@fb.com> | 2017-10-05 19:19:23 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-08 01:05:57 +0300 |
| commit | 81b9cf8028a17bdbdaa0da80b735b32150d4e89e (patch) | |
| tree | b5ec33cc6476e31c8e30c6623e635c6b75be80ae /samples/bpf/trace_event_user.c | |
| parent | 4bebdc7a85aa400c0222b5329861e4ad9252f1e5 (diff) | |
| download | linux-81b9cf8028a17bdbdaa0da80b735b32150d4e89e.tar.xz | |
bpf: add a test case for helper bpf_perf_prog_read_value
The bpf sample program trace_event is enhanced to use the new
helper to print out enabled/running time.
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/trace_event_user.c')
| -rw-r--r-- | samples/bpf/trace_event_user.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/samples/bpf/trace_event_user.c b/samples/bpf/trace_event_user.c index 7bd827b84a67..bf4f1b6d9a52 100644 --- a/samples/bpf/trace_event_user.c +++ b/samples/bpf/trace_event_user.c @@ -127,6 +127,9 @@ static void test_perf_event_all_cpu(struct perf_event_attr *attr) int *pmu_fd = malloc(nr_cpus * sizeof(int)); int i, error = 0; + /* system wide perf event, no need to inherit */ + attr->inherit = 0; + /* open perf_event on all cpus */ for (i = 0; i < nr_cpus; i++) { pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0); @@ -154,6 +157,11 @@ static void test_perf_event_task(struct perf_event_attr *attr) { int pmu_fd; + /* per task perf event, enable inherit so the "dd ..." command can be traced properly. + * Enabling inherit will cause bpf_perf_prog_read_time helper failure. + */ + attr->inherit = 1; + /* open task bound event */ pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0); if (pmu_fd < 0) { @@ -175,14 +183,12 @@ static void test_bpf_perf_event(void) .freq = 1, .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES, - .inherit = 1, }; struct perf_event_attr attr_type_sw = { .sample_freq = SAMPLE_FREQ, .freq = 1, .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_CLOCK, - .inherit = 1, }; struct perf_event_attr attr_hw_cache_l1d = { .sample_freq = SAMPLE_FREQ, @@ -192,7 +198,6 @@ static void test_bpf_perf_event(void) PERF_COUNT_HW_CACHE_L1D | (PERF_COUNT_HW_CACHE_OP_READ << 8) | (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16), - .inherit = 1, }; struct perf_event_attr attr_hw_cache_branch_miss = { .sample_freq = SAMPLE_FREQ, @@ -202,7 +207,6 @@ static void test_bpf_perf_event(void) PERF_COUNT_HW_CACHE_BPU | (PERF_COUNT_HW_CACHE_OP_READ << 8) | (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), - .inherit = 1, }; struct perf_event_attr attr_type_raw = { .sample_freq = SAMPLE_FREQ, @@ -210,7 +214,6 @@ static void test_bpf_perf_event(void) .type = PERF_TYPE_RAW, /* Intel Instruction Retired */ .config = 0xc0, - .inherit = 1, }; printf("Test HW_CPU_CYCLES\n"); |