[dm-devel] [PATCHv3 0/5] dm-multipath: push back requests instead of queueing

[Hannes Reinecke]

Hi all,

dm-multipath still carries around it's own queueing framework for
implementing 'queue_if_no_path'.
However, there is no real reason for this; we could as well
push back the requests onto the request_queue.
In doing so we can also reduce the memory pressure during
fail_if_no_path scenarios, as we don't have to allocate a
context for each request when it need to be requeued.

This patchset is the third version, including
the review by Jun'ichi Nomura and suggestions from Mike Snitzer.

Hannes Reinecke (5):
  dm-multipath: Do not call pg_init twice
  dm-multipath: push back requests instead of queueing
  dm-multipath: remove process_queued_ios()
  dm-multipath: reduce memory pressure during requeuing
  dm-multipath: remove map_io()

 drivers/md/dm-mpath.c         | 214 +++++++++++++++---------------------------
 drivers/md/dm.c               |  13 +++
 include/linux/device-mapper.h |   1 +
 3 files changed, 88 insertions(+), 140 deletions(-)

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1.7.12.4