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    SubjectRe: [PATCH 6/6] vmscan: Do not writeback pages in direct reclaim
    On Thu, Jun 10, 2010 at 11:17:06PM -0700, Andrew Morton wrote:
    > As it stands, it would be wildly incautious to make a change like
    > this without first working out why we're pulling so many dirty pages
    > off the LRU tail, and fixing that.

    Note that unlike the writepage vs writepages from kswapd which can
    be fixed by the right tuning this is a black or white issue. Writeback
    from direct reclaim will kill your stack if the caller happens to be
    the wrong one, and just making it happen less often is not a fix - it
    must not happen at all.



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