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

    On Wed, Oct 07, 2009 at 03:38:27PM +0800, Wu Fengguang (fengguang.wu@intel.com) 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 <zbr@ioremap.net>
    > Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

    --
    Evgeniy Polyakov


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