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    SubjectRe: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim
    On Tue, Jul 06, 2010 at 09:36:41AM +0900, KOSAKI Motohiro wrote:
    > Hello,
    > > Ok, that's reasonable as I'm still working on that patch. For example, the
    > > patch disabled anonymous page writeback which is unnecessary as the stack
    > > usage for anon writeback is less than file writeback.
    > How do we examine swap-on-file?

    Anything in particular wrong with the following?

    * For now, only kswapd can writeback filesystem pages as otherwise
    * there is a stack overflow risk
    static inline bool reclaim_can_writeback(struct scan_control *sc,
    struct page *page)
    return !page_is_file_cache(page) || current_is_kswapd();

    Even if it is a swapfile, I didn't spot a case where the filesystems
    writepage would be called. Did I miss something?

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

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