On Wed, Mar 07, 2007 at 11:47:42AM +0100, Peter Zijlstra wrote: > On Wed, 2007-03-07 at 11:38 +0100, Nick Piggin wrote: > > > > > There are real users who want these fast, though. > > > > > > Yeah, why don't we have a tree per nonlinear vma to find these pages? > > > > > > wli mentions shadow page tables.. > > > > We could do something more efficient, but I thought that half the point > > was that they didn't carry any of this extra memory, and they could be > > really fast to set up at the expense of efficiency elsewhere. > > I'm failing to understand this :-( > > That extra memory, and apparently they don't want the inefficiency > either.
Sorry, I didn't understand your misunderstandings ;) > > > I don't see it being a big deal. I doubt anybody is writing out huge > > amounts of data via nonlinear mappings. > > Well, now they don't, but it could be done or even exploited as a DoS. But so could nonlinear page reclaim. I think we need to restrict nonlinear mappings to root if we're worried about that. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
