diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_perf_buffer.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_perf_buffer.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_perf_buffer.c b/tools/testing/selftests/bpf/progs/test_perf_buffer.c index d37ce29fd393..17d5b67744d5 100644 --- a/tools/testing/selftests/bpf/progs/test_perf_buffer.c +++ b/tools/testing/selftests/bpf/progs/test_perf_buffer.c @@ -7,6 +7,13 @@ #include <bpf/bpf_tracing.h> struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __type(key, int); + __type(value, int); + __uint(max_entries, 1); +} my_pid_map SEC(".maps"); + +struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __type(key, int); __type(value, int); @@ -15,11 +22,20 @@ struct { SEC("tp/raw_syscalls/sys_enter") int handle_sys_enter(void *ctx) { + int zero = 0, *my_pid, cur_pid; int cpu = bpf_get_smp_processor_id(); + my_pid = bpf_map_lookup_elem(&my_pid_map, &zero); + if (!my_pid) + return 1; + + cur_pid = bpf_get_current_pid_tgid() >> 32; + if (cur_pid != *my_pid) + return 1; + bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU, &cpu, sizeof(cpu)); - return 0; + return 1; } char _license[] SEC("license") = "GPL"; |