On Thu, Jun 01, 2017 at 02:13:56PM +0200, Peter Zijlstra wrote: > So we do that lookup for every single frame. That's going to hurt. > > Would it make sense to cache the last 'module' in an attempt to at least > avoid that lookup again? Something like so:
The only thing with caching the module is, what if the module goes away? Based on your previous comment I was thinking I would disable preemption for the entire unwind_next_frame() step, but not *between* steps. I suppose we could require the unwind caller to disable preemption but I'd like to avoid that if possible. -- Josh
