hist_key 74 samples/bpf/tracex2_kern.c .key_size = sizeof(struct hist_key), hist_key 85 samples/bpf/tracex2_kern.c struct hist_key key; hist_key 44 samples/bpf/tracex2_user.c struct hist_key key = {}, next_key; hist_key 83 samples/bpf/tracex2_user.c struct hist_key key = {}, next_key;