@@ -37,8 +37,10 @@ struct bpf_map_def SEC("maps") stackmap = {
SEC("perf_event")
int bpf_prog1(struct bpf_perf_event_data *ctx)
{
+ char time_fmt[] = "Time Enabled: %lld, Time Running: %lld";
char fmt[] = "CPU-%d period %lld ip %llx";
u32 cpu = bpf_get_smp_processor_id();
+ struct bpf_perf_time time_buf;
struct key_t key;
u64 *val, one = 1;
@@ -54,6 +56,9 @@ int bpf_prog1(struct bpf_perf_event_data *ctx)
return 0;
}
+ bpf_perf_prog_read_time(ctx, (void *)&time_buf, sizeof(struct bpf_perf_time));
+ bpf_trace_printk(time_fmt, sizeof(time_fmt), time_buf.enabled, time_buf.running);
+
val = bpf_map_lookup_elem(&counts, &key);
if (val)
(*val)++;
@@ -74,6 +74,9 @@ static int (*bpf_perf_read_counter_time)(void *map, unsigned long long flags,
void *counter_time_buf,
unsigned int buf_size) =
(void *) BPF_FUNC_perf_read_counter_time;
+static int (*bpf_perf_prog_read_time)(void *ctx, void *time_buf,
+ unsigned int size) =
+ (void *) BPF_FUNC_perf_prog_read_time;
/* llvm builtin functions that eBPF C program may use to
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> --- samples/bpf/trace_event_kern.c | 5 +++++ tools/testing/selftests/bpf/bpf_helpers.h | 3 +++ 2 files changed, 8 insertions(+)