What does "some" mean?
"For example, if swapping or paging is used, the kernel on each CPU is the logical place to determine what to swap or page. There is no reason to centralize this authority. Similarly, if multiple processes are running on some CPU, it makes sense to do the scheduling right there, too."
It means any CPU, whatever CPU, but not a specific CPU.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.