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    SubjectRe: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear)
    On Wed, 2007-03-07 at 14:52 +0100, Peter Zijlstra wrote:

    > True. We could even guesstimate the nonlinear dirty pages by subtracting
    > the result of page_mkclean() from page_mapcount() and force an
    > msync(MS_ASYNC) on said mapping (or all (nonlinear) mappings of the
    > related file) when some threshold gets exceeded.

    Almost, but not quite, we'd need to extract another value from the
    page_mkclean() run, the actual number of mappings encountered. The
    return value only sums the number of dirty mappings encountered.

    s390 would already work I guess.

    Certainly doable.

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