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/randwrite
over multi dispatch-queue virtio-blk, see details in commit log
of patch 9/9.
This patchset can be pulled from below tree too:
git://kernel.ubuntu.com/ming/linux.git v3.17-block-dev_v2
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
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