Re: [Xen-devel] writable pagetables scalability issue

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 7/12/07 17:53, "Rik van Riel" <riel@xxxxxxxxxx> wrote:

>> I think we can probably just as easily strip out the big lock entirely from
>> the critical paths. It's not really needed much these days.
> 
> "not needed much" makes me kind of nervous :)
> 
> Exactly what do we still need to protect against?

The main thing right now is update_va_mapping() goes at the linear map, and
has to avoid races where a pte is being deconstructed but has not yet been
flushed from the linear map. If we change the implementation of
update_va_mapping() then I think the biglock can fall away.

 -- Keir



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