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    SubjectRe: [PATCH 5/5] mm: writeback: Prioritise dirty inodes encountered by direct reclaim for background flushing
    On Wed, Jul 13, 2011 at 03:31:27PM +0100, Mel Gorman wrote:
    > It is preferable that no dirty pages are dispatched from the page
    > reclaim path. If reclaim is encountering dirty pages, it implies that
    > either reclaim is getting ahead of writeback or use-once logic has
    > prioritise pages for reclaiming that are young relative to when the
    > inode was dirtied.

    what does this buy us? If at all we should prioritize by a zone,
    e.g. tell write_cache_pages only to bother with writing things out
    if the dirty page is in a given zone. We'd probably still cluster
    around it to make sure we get good I/O patterns, but would only start
    I/O if it has a page we actually care about.



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