Feels like there isn't a solution using current OSes. Why does CPU locking exist? I'm sure this is pretty technical question but if anyone has a dumb answer fo

Feels like there isn't a solution using current OSes. Why does CPU locking exist? I'm sure this is pretty technical question but if anyone has a dumb answer for me... Is this something impossible get rid of? Can it be scoped to a core and not the entire CPU?