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    SubjectRe: [Lsf] [RFC] writeback and cgroup
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    On Wed, 2012-04-04 at 11:49 -0700, Tejun Heo wrote:
    > > - How to handle NFS.
    >
    > As said above, maybe through network based bdi pressure propagation,
    > Maybe some other special case mechanism. Unsure but I don't think
    > this concern should dictate the whole design.

    NFS has a custom bdi implementation and implements congestion control
    based on the number of outstanding writeback pages.

    See fs/nfs/write.c:nfs_{set,end}_page_writeback

    All !block based filesystems have their own BDI implementation, I'm not
    sure on the congestion implementation of anything other than NFS though.


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