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    SubjectRe: [PATCH 09/10] vmscan: Do not writeback filesystem pages in direct reclaim
    On Thu, Oct 28, 2010 at 05:50:46PM -0400, Christoph Hellwig wrote:
    > Looks like this once again didn't get merged for 2.6.37. Any reason
    > for that?

    There are still concerns as to whether this is a good idea or or whether we
    are papering over the fact that there are too many dirty pages at the end
    of the LRU. The tracepoints necessary to track the dirty pages encountered
    went in this cycle as well as some writeback and congestion-waiting changes.
    I was waiting for some of the writeback churn to die down before
    revisiting this. The ideal point to reach is "we hardly ever encounter
    dirty pages so disabling direct writeback has no impact".

    Mel Gorman
    Part-time Phd Student Linux Technology Center
    University of Limerick IBM Dublin Software Lab

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