perf_env__arch_strerrno
const char *e = perf_env__arch_strerrno(env, err);
fprintf(fp, "\t\t\t\t%s: %d\n", perf_env__arch_strerrno(trace->host->env, e + 1), stats->errnos[e]);
const char *perf_env__arch_strerrno(struct perf_env *env, int err);