Subject: Re: [PATCH 2/2][RT] powerpc - Make the irq reverse mapping radix tree lockless

From: Sebastien Dugue <[email-masked]>
Date: Fri, 25 Jul 2008 10:36:01 +0200

On Fri, 25 Jul 2008 18:27:20 +1000 Benjamin Herrenschmidt <[email-masked]> wrote:

> On Fri, 2008-07-25 at 09:49 +0200, Peter Zijlstra wrote:
> > 
> > 
> > The only advantage of the concurrent radix tree over this model is that
> > it can potentially do multiple modification operations at the same time.
> 
> Yup, we do not need that for the irq revmap... concurrent lookup is all we need.
> 

  Shouldn't we care about concurrent insertion and deletion in the tree? I agree
that concern might be a bit artificial but in theory that can happen.

  Sebastien.