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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 Tue, Jun 15, 2010 at 05:30:44PM +0100, Mel Gorman wrote:
    > After grepping through fs/, it was only xfs and btrfs that I saw were
    > specfically disabling writepage from reclaim context.

    ext4 doesn't specificly disable writeback from reclaim context, but
    in a rather convoluted way disabled basically all writeback through
    ->writepage. The only thing allowed is overwrites of already allocated

    In addition to that reiserfs also frefuses to write back pages
    from reclaim context if they require a transaction, which is the case
    if the file was written to through mmap.

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      Last update: 2010-06-15 18:37    [W:0.018 / U:27.768 seconds]
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