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    SubjectRe: [PATCH v2 5/9] writeback: introduce the pageout work
    > However the other type of works, if ever they come, can still block us
    > for long time. Will need a proper way to guarantee fairness.

    The simplistic way around this may be to refuse to queue new pageout
    works when found other type of works in the queue. Then vmscan will
    fall back to pageout(). It's rare condition anyway and hardly deserves
    a comprehensive fairness scheme.

    Thanks,
    Fengguang


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