The code of os::get_summary_cpu_info in os_aix.cpp calls into the libperfstat wrapper to get an instance of the cpuinfo_t struct filled. But it is only interested in the system/processor version string. This information can directly be acquired from the static _system_configuration.version field and does not need a libperfstat call. Also, libperfstat::get_cpuinfo does not need to maintain a field 'version' because it is not used anywhere else but os::get_summary_cpu_info.