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    SubjectRe: [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaim and use a_ops->writepages() where possible
    On Wed, Jun 16, 2010 at 12:59:54PM -0400, Rik van Riel wrote:
    > __GFP_IO can wait for filesystem activity

    Hmm I think it's for submitting I/O, not about waiting. At some point
    you may not enter the FS because of the FS locks you already hold
    (like within writepage itself), but you can still submit I/O through
    blkdev layer.

    > __GFP_FS can kick off new filesystem activity

    Yes that's for dcache/icache/writepage or anything that can reenter
    the fs locks and deadlock IIRC.


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