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    SubjectRe: [PATCH 09/45] writeback: quit on wrap for .range_cyclic (pohmelfs)

    On Wed, Oct 07, 2009 at 03:38:27PM +0800, Wu Fengguang ( wrote:
    > Convert wbc.range_cyclic to new behavior: when past EOF, abort writeback
    > of the inode, which instructs writeback_single_inode() to delay it for
    > a while if necessary.
    > It removes one inefficient .range_cyclic IO pattern when writeback_index
    > wraps:
    > submit [10000-10100], (wrap), submit [0-100]
    > In which the submitted pages may be consisted of two distant ranges.
    > It also prevents submitting pointless IO for busy overwriters.

    I have no objections against this patchset, since I followed the
    upstream writeback behaviour and did not personally observe such wraps
    which would be otherwise handled in a single run.

    > CC: Evgeniy Polyakov <>
    > Signed-off-by: Wu Fengguang <>

    Evgeniy Polyakov

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