Man pages matching name sys::cpuaffinity in section 3pm:

Sys::CpuAffinity.3pm.en	debian 10 / libsys-cpuaffinity-perl
Sys::CpuAffinity.3pm.en	debian 11 / libsys-cpuaffinity-perl
Sys::CpuAffinity.3pm.en	debian 12 / libsys-cpuaffinity-perl