Re: [Alacrityvm-devel] [KVM PATCH v2 1/2] KVM: export lockless GSIattribute

[Avi Kivity]

On 10/26/2009 05:38 PM, Gregory Haskins wrote:
> > > Instead of a lockless attribute, how about a ->set_atomic() method.  For
> > > msi this can be the same as ->set(), for non-msi it can be a function
> > > that schedules the work (which will eventually call ->set()).
> > >
> > > The benefit is that we make a decision only once, when preparing the
> > > routing entry, and install that decision in the routing entry instead of
> > > making it again and again later.
> > >        
> > Yeah, I like this idea.  I think we can also get rid of the custom
> > workqueue if we do this as well, TBD.
> >      
> So I looked into this.  It isn't straight forward because you need to
> retain some kind of state across the deferment on a per-request basis
> (not per-GSI).  Today, this state is neatly tracked into the irqfd
> object itself (e.g. it knows to toggle the GSI).
>    

Yes, and it also contains the work_struct.

What if we make the work_struct (and any additional state) part of the 
set_atomic() argument list?  Does it simplify things?

> So while generalizing this perhaps makes sense at some point, especially
> if irqfd-like interfaces get added, it probably doesn't make a ton of
> sense to expend energy on it ATM.  It is basically a generalization of
> the irqfd deferrment code.  Lets just wait until we have a user beyond
> irqfd for now.  Sound acceptable?
>    

I'll look at v3, but would really like to disentangle this.

> In the meantime, I found a bug in the irq_routing code, so I will submit
> a v3 with this fix, as well as a few other things I improved in the v2
> series.
>
>    


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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/