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

[Wu Fengguang <fengguang.wu@intel.com>]

Hi,

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(-)

Thanks,
Fengguang