Re: [PATCH] perf_events: improve x86 event scheduling (v5)

[Frederic Weisbecker <fweisbec@gmail.com>]

On Thu, Jan 21, 2010 at 12:44:03PM +0100, Stephane Eranian wrote:
> > If the scheduling validation fails, then you just need to rollback
> > the whole group.
> >
> > That's sensibly what you did in your patch, right? Except the loop
> > is now handled by the core code.
> >
> >
> Ok, I think I missed where you were actually placing that loop.
> So you want to do this in group_sched_in(), right?



Exactly!


 
> >
> > I don't understand why that can't be done with the above model.
> > In your patch we iterate through the whole group, collect events,
> > and schedule them.
> >
> > With the above, the collection is just done on enable(), and the scheduling
> > is done with the new pmu callbacks.
> >
> > The thing is sensibly the same, where is the obstacle?
> >
> There is none. You've just hoisted the some of the code from
> hw_perf_group_sched_in().


Exactly :)