Re: [PATCH v2] core, x86: Add user return notifiers

Peter Zijlstra
2009-09-22T16:56:05Z

On Tue, 2009-09-22 at 19:52 +0300, Avi Kivity wrote:
> On 09/22/2009 07:50 PM, Peter Zijlstra wrote:
> >> Would be nice to convert some existing open-coded return-to-user-space
> >> logic to this facility. One such candidate would be lockdep_sys_exit?
> >>
> > And here I was thinking this was one of the hottest code paths in the
> > whole kernel...
> >
>
> If you're using lockdep, surely that's not your biggest worry?

No, but that's all under #ifdef and fully disappears when not enabled.
Generic return-tu-user notifiers don't sound like they will though.