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Got a bug report on io_uring that submission time with O_DIRECT rose
dramatically once the queue depth got higher. Turns out that
__blkdev_direct_IO() does not honor IOCB_NOWAIT at all.
blk-mq returns -EAGAIN errors through the bio end_io callback, which
isn't super useful for cases where you want
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Here's v4 of the io_uring interface. No user visible changes this
time, outside of bumping the io_uring_sqe submission entry to a
full 64-bytes. This aligns better with caches, and leaves us some
room to grow for future features. See the v3 posting for full
details on the API:
https://lore.kernel.
Three patches here:
1) Ensure that we align ->map properly
2) v2 of the sbitmap clear cost ammortization. Updated to do a wakeup
check AFTER we're done swapping free/cleared masks. Kept the
separate alignment for ->word, as it is faster in testing.
3) Cost reduction of having to do wait qu
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Subject: [GIT PULL] nvme updates for 4.20
Reply-To:
A relatively boring merge window:
- better AEN tracing (Chaitanya)
- NUMA aware PCIe multipathing (me)
- RDMA workqueue fixes (Sagi)
- better bio usage in the target (Sagi)
- FC rework for target removal (James)
- better multipath h
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This patch enables scsi pm on systems where mq is explicitly disabled.
[PATCH v2 1/2] bcache: writeback rate shouldn't artifically clamp
[PATCH v2 2/2] bcache: rearrange writeback main thread ratelimit
This is a reroll of the previous "don't clamp" patch. It corrects
type issues where negative numbers were handled badly (mostly for
display in writeback_rate_debug).
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Subject: an iomap-based direct I/O implementation
Hi all,
this series adds a new direct I/O implementation based on the iomap
interface, and switches XFS to use it.
The first two patches are a resend of my earlier series to remove the
XFS iolock. They are needed for the lockdep assert in the ne
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