> 
> That is, if the page is already referenced, fault-on-{read,exec} isn't
> set in the PTE, since we already know the page is referenced, and thus
> don't need to take a (unnecessary) fault to know that.  Same with modified.

Ah.  I understand.

I still think we need to be a bit wary of granting write access because of 
VAC issues; but I agree we could probably do better than at present, 
particularly for read access.

R.