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    Subject[PATCH 0/7] writeback: avoid touching dirtied_when on blocked inodes

    This tries to keep dirtied_when for blocked inodes by converting some
    redirty_tail() calls to requeue_io_wait(). The possibly blocked inodes
    will be moved to b_more_io_wait. The b_more_io_wait inodes will now be
    retried as dillegent as b_more_io inodes, except when the latter goes empty,
    b_more_io_wait will be retried by the kupdate work on increasing intervals
    until exceeding dirty_writeback_interval.

    Christoph Hellwig (1):
    writeback: avoid redirtying when ->write_inode failed to clear I_DIRTY

    Jan Kara (2):
    writeback: update wb->last_active on written pages/inodes
    writeback: Retry kupdate work early if we need to retry some inode writeback

    Wu Fengguang (4):
    writeback: introduce queue b_more_io_wait
    writeback: requeue_io_wait() on pages_skipped inode
    writeback: requeue_io_wait() on blocked inode
    writeback: requeue_io_wait() when failed to grab superblock

    fs/fs-writeback.c | 62 ++++++++++++++++++++++++++++++++++---------
    include/linux/backing-dev.h | 8 +++--
    mm/backing-dev.c | 10 +++++-
    3 files changed, 62 insertions(+), 18 deletions(-)


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