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    SubjectRe: nfs unhappiness with memory pressure
    Trond Myklebust wrote:
    > On Tue, 2005-12-06 at 14:36 +1100, Andrew Morton wrote:
    >
    >>Trond Myklebust <trond.myklebust@fys.uio.no> wrote:
    >>
    >>>Argh... Not sure entirely how to deal with that... We definitely don't
    >>> want the thing futzing around inside throttle_vm_writeout(), 'cos
    >>> writeout isn't going to happen while the socket blocks.
    >>>
    >>
    >>As far as the core VM is concerned, these pages are really "dirty", only it
    >>happens to be a different flavour of dirtiness. So perhaps we should
    >>continue to mark these pages as dirty and let NFS internally take care
    >>of which end of the wire they're dirty at.
    >>
    >>Presumably calling writepage() a second time won't be very useful. Or will
    >>it? Perhaps when NFS sees writepage against a PageDirty && PageUnstable
    >>page it can recognise that as a hint to kick off a server-side write.
    >
    >
    > Calling writepages() would actually be better. That will do the right
    > thing, and trigger a commit if there are unstable writes.
    >

    writepage should as well, then it would have a better chance
    of just doing the right thing.

    --
    SUSE Labs, Novell Inc.

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