samples/bpf: add example to test reading address
This commit adds additional test in the trace_event example, by attaching the bpf program to MEM_UOPS_RETIRED.LOCK_LOADS event with PERF_SAMPLE_ADDR requested, and print the lock address value read from the bpf program to trace_pipe. Signed-off-by: Teng Qin <qinteng@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
parent
95da0cdb72
commit
12fe12253c
|
@ -39,6 +39,7 @@ int bpf_prog1(struct bpf_perf_event_data *ctx)
|
|||
{
|
||||
char time_fmt1[] = "Time Enabled: %llu, Time Running: %llu";
|
||||
char time_fmt2[] = "Get Time Failed, ErrCode: %d";
|
||||
char addr_fmt[] = "Address recorded on event: %llx";
|
||||
char fmt[] = "CPU-%d period %lld ip %llx";
|
||||
u32 cpu = bpf_get_smp_processor_id();
|
||||
struct bpf_perf_event_value value_buf;
|
||||
|
@ -64,6 +65,9 @@ int bpf_prog1(struct bpf_perf_event_data *ctx)
|
|||
else
|
||||
bpf_trace_printk(time_fmt2, sizeof(time_fmt2), ret);
|
||||
|
||||
if (ctx->addr != 0)
|
||||
bpf_trace_printk(addr_fmt, sizeof(addr_fmt), ctx->addr);
|
||||
|
||||
val = bpf_map_lookup_elem(&counts, &key);
|
||||
if (val)
|
||||
(*val)++;
|
||||
|
|
|
@ -215,6 +215,17 @@ static void test_bpf_perf_event(void)
|
|||
/* Intel Instruction Retired */
|
||||
.config = 0xc0,
|
||||
};
|
||||
struct perf_event_attr attr_type_raw_lock_load = {
|
||||
.sample_freq = SAMPLE_FREQ,
|
||||
.freq = 1,
|
||||
.type = PERF_TYPE_RAW,
|
||||
/* Intel MEM_UOPS_RETIRED.LOCK_LOADS */
|
||||
.config = 0x21d0,
|
||||
/* Request to record lock address from PEBS */
|
||||
.sample_type = PERF_SAMPLE_ADDR,
|
||||
/* Record address value requires precise event */
|
||||
.precise_ip = 2,
|
||||
};
|
||||
|
||||
printf("Test HW_CPU_CYCLES\n");
|
||||
test_perf_event_all_cpu(&attr_type_hw);
|
||||
|
@ -236,6 +247,10 @@ static void test_bpf_perf_event(void)
|
|||
test_perf_event_all_cpu(&attr_type_raw);
|
||||
test_perf_event_task(&attr_type_raw);
|
||||
|
||||
printf("Test Lock Load\n");
|
||||
test_perf_event_all_cpu(&attr_type_raw_lock_load);
|
||||
test_perf_event_task(&attr_type_raw_lock_load);
|
||||
|
||||
printf("*** PASS ***\n");
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in a new issue