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    SubjectRe: nfs unhappiness with memory pressure
    On Tue, 2005-12-06 at 07:52 +1100, Nick Piggin wrote:

    > The VM doesn't expect to have to rely on pdflush to write out pages
    > for it. ->writepage should be enough. Adding wakeup_pdflush here
    > actually could do the wrong thing for non-NFS filesystems if it
    > starts more writeback.

    nr_unstable is not going to be set for non-NFS filesystems. 'unstable'
    is a caching state in which pages have been written out to the NFS
    server, but the server has not yet flushed the data to disk.


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