map_exit_fd 3018 tools/perf/builtin-trace.c map_exit_fd = bpf_map__fd(trace->syscalls.prog_array.sys_exit); map_exit_fd 3035 tools/perf/builtin-trace.c err = bpf_map_update_elem(map_exit_fd, &key, &prog_fd, BPF_ANY);