Re: [RFC PATCH] asynchronous page fault.

[Peter Zijlstra]

On Mon, 2009-12-28 at 09:36 +0900, KAMEZAWA Hiroyuki wrote:
> 
> > The idea is to let the RCU lock span whatever length you need the vma
> > for, the easy way is to simply use PREEMPT_RCU=y for now, 
> 
> I tried to remove his kind of reference count trick but I can't do that
> without synchronize_rcu() somewhere in unmap code. I don't like that and
> use this refcnt. 

Why, because otherwise we can access page tables for an already unmapped
vma? Yeah that is the interesting bit ;-)



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