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 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
over multi dispatch-queue virtio-blk, see details in commit log
of patch 10/10.
This patchset can be pulled from below tree too:
git://kernel.ubuntu.com/ming/linux.git v3.17-block-dev_v3
V3:
- don't return failure code from blk_alloc_flush_queue() to
avoid freeing invalid buffer in case of allocation failure
- remove blk_init_flush() and blk_exit_flush()
- remove unnecessary WARN_ON() from blk_alloc_flush_queue()
V2:
- refactor blk_mq_init_hw_queues() and its pair, also it is a fix
on failure path, so that conversion to per-queue flush becomes simple.
- allocate/initialize flush queue in blk_mq_init_hw_queues()
- add sync write tests on virtio-blk which is backed by SSD image
V1:
- commit log typo fix
- introduce blk_alloc_flush_queue() and its pair earlier, so
that patch 5 and 8 become easier for review
block/blk-core.c | 12 ++--
block/blk-flush.c | 129 +++++++++++++++++++++++++-------------
block/blk-mq.c | 160 ++++++++++++++++++++++++++++++------------------
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, 230 insertions(+), 123 deletions(-)
Thanks,
--
Ming Lei
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