Scott Cheloha <scottchel...@gmail.com> wrote: > Secondary CPUs are still running at the top of sleep_state(). To > disable _mcount with gmoninit we would need to wait until after > secondary CPUs have halted to toggle it off, which is way further into > sleep_state().
I suspect you are exaggerating the window of time when _mcount is dangerous to call. Disable it early, re-enable it late, and avoid trying to write a complicated solution.
