[ofa-general] Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges

[Christoph Lameter]

On Tue, 19 Feb 2008, Andrea Arcangeli wrote:

> Yes, that's why I kept maintaining my patch and I posted the last
> revision to Andrew. I use pte/tlb locking of the core VM, it's
> unintrusive and obviously safe. Furthermore it can be extended with
> Christoph's stuff in a 100% backwards compatible fashion later if needed.

How would that work? You rely on the pte locking. Thus calls are all in an 
atomic context. I think we need a general scheme that allows sleeping when 
references are invalidates. Even the GRU has performance issues when using 
the KVM patch.