[PATCH 0/8] block: per-distpatch_queue flush machinery

[Ming Lei]

Hi,

As recent discussion, especially suggested by Christoph, this patchset
implements per-distpatch_queue flush machinery, so that:

	- current init_request and exit_request callbacks can
	cover flush request too, then the ugly and buggy copying
	way of initializing flush request's pdu can be fixed
    
	- flushing performance gets improved in case of multi hw-queue

About 70% throughput improvement is observed in sync write/randwrite
over multi dispatch-queue virtio-blk, see details in commit log
of patch 8/8.

This patchset can be pulled from below tree too:

	git://kernel.ubuntu.com/ming/linux.git v3.17-block-dev


 block/blk-core.c       |   11 +--
 block/blk-flush.c      |  239 +++++++++++++++++++++++++++++++++++++++---------
 block/blk-mq.c         |   27 +++---
 block/blk-mq.h         |    1 -
 block/blk-sysfs.c      |    4 +-
 block/blk.h            |   35 ++++++-
 include/linux/blk-mq.h |    2 +
 include/linux/blkdev.h |   10 +-
 8 files changed, 251 insertions(+), 78 deletions(-)

Thanks,
--
Ming Lei

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