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

[Avi Kivity]

On 09/22/2009 05:32 PM, Ingo Molnar wrote:
> * Avi Kivity<avi@xxxxxxxxxx>  wrote:
>
>    
> > On 09/19/2009 09:40 AM, Avi Kivity wrote:
> >      
> > > Add a general per-cpu notifier that is called whenever the kernel is
> > > about to return to userspace.  The notifier uses a thread_info flag
> > > and existing checks, so there is no impact on user return or context
> > > switch fast paths.
> > >
> > >        
> > Ingo/Peter?
> >      
> 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?
>    

I only implemented this for x86, while lockdep is arch independent.  If 
arch support is added, it should be trivial.

I think perf counters could use preempt notifiers though, these are arch 
independent.

--
error compiling committee.c: too many arguments to function

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