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    SubjectRe: [PATCH 6/6] writeback: refill b_io iff empty
    On Wed 04-05-11 15:39:31, Wu Fengguang wrote:
    > To help understand the behavior change, I wrote the writeback_queue_io
    > trace event, and found very different patterns between
    > - vanilla kernel
    > - this patchset plus the sync livelock fixes
    > Basically the vanilla kernel each time pulls a random number of inodes
    > from b_dirty, while the patched kernel tends to pull a fixed number of
    > inodes (enqueue=1031) from b_dirty. The new behavior is very interesting...
    This regularity is really strange. Did you have a chance to look more into
    it? I find it highly unlikely that there would be exactly 1031 dirty inodes
    in b_dirty list every time you call move_expired_inodes()...

    Jan Kara <>
    SUSE Labs, CR

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