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    SubjectRe: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear)
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    On Wed, 2007-03-07 at 11:21 +0100, Nick Piggin wrote:
    > On Wed, Mar 07, 2007 at 11:13:20AM +0100, Miklos Szeredi wrote:
    > > > *sigh* yes was looking at all that code, thats gonna be darn slow
    > > > though, but I'll whip up a patch.
    > >
    > > Well, if it's going to be darn slow, maybe it's better to go with
    > > mingo's plan on emulating nonlinear vmas with linear ones. That'll be
    >
    > 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..

    > > darn slow as well, but at least it will be much less complicated.
    >
    > IMO, the best thing to do is just restore msync behaviour, and comment
    > the fact that we ignore nonlinears. We need to restore msync behaviour
    > to fix races in regular mappings anyway, at least for now.

    Seems to be the best quick solution indeed.

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