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    SubjectRe: [PATCH 09/45] writeback: quit on wrap for .range_cyclic (pohmelfs)
    On Wed, Oct 07, 2009 at 08:32:11PM +0800, Evgeniy Polyakov wrote:
    > 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.

    OK, thanks!

    Fengguang


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