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    SubjectRe: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear)
    On Wed, Mar 07, 2007 at 01:07:56AM -0800, Andrew Morton wrote:
    > On Wed, 07 Mar 2007 09:51:57 +0100 Miklos Szeredi <> wrote:
    > > > > Dirty page accounting doesn't work either on
    > > > > non-linear mappings
    > > >
    > > > It doesn't? Confused - these things don't have anything to do with each
    > > > other do they?
    > >
    > > Look in page_mkclean(). Where does it handle non-linear mappings?
    > >
    > OK, I'd forgotten about that. It won't break dirty memory accounting,
    > but it'll potentially break dirty memory balancing.
    > If we have the wrong page (due to nonlinear), page_check_address() will
    > fail and we'll leave the pte dirty. That puts us back to the pre-2.6.17
    > algorithms and I guess it'll break the msync guarantees.
    > Peter, I thought we went through the nonlinear problem ages ago and decided
    > it was OK?

    msync breakage is bad, but otherwise I don't know that we care about
    dirty page writeout efficiency.

    But I think we discovered that those msync changes are bogus anyway
    becuase there is a small race window where pte could be dirtied without
    page being set dirty?

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