A “pin_on_cpu” system call has been proposed for the Linux kernel as a new means of letting user-space threads pin themselves to specific CPU cores. User-space processes requesting to be run on specific CPU cores can already e done by the likes of Linux’s sched_setaffinity to get/set the CPU affinity mask while pin_on_cpu would be a new and simpler way. The current calls also run into issues around CPU hot-plugging, as explained further in the RFC mailing list post.
Setting the CPU core to run on with the proposed pin_on_cpu system call would still require that the specific CPU be part of the allowed CPU mask.
[Source: Phoronix]
