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    Subject[PATCH 0/6] writeback: moving expire targets for background/kupdate works v2

    This aims to reduce possible pageout() calls by making the flusher
    concentrate a bit more on old/expired dirty inodes.

    Rationals and benchmark numbers are added in patches 05, 06.

    It runs fine on simple workloads over ext3/4, xfs, btrfs and NFS.

    code refactor
    [PATCH 1/6] writeback: pass writeback_control down to move_expired_inodes()

    loop condition fixes
    [PATCH 2/6] writeback: introduce writeback_control.inodes_cleaned
    [PATCH 3/6] writeback: try more writeback as long as something was written

    make dirty expire time a moving target
    [PATCH 4/6] writeback: the kupdate expire timestamp should be a moving target
    [PATCH 5/6] writeback: sync expired inodes first in background writeback

    consistent requeue policy
    it's not an integral part of this patchset, however do depends on patch 03
    [PATCH 6/6] writeback: refill b_io iff empty


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