Re: [PATCH v2 0/8] ublk: io_desc optimizations

On Mon, 03 Aug 2026 15:14:32 -0600, Caleb Sander Mateos wrote:
> This series is based on the "ublk: harden user buffer handling" series.
> 
> ublk passes the parameters of incoming I/O in memory shared between the
> kernel ublk driver and userspace ublk server in struct ublksrv_io_desc.
> 
> The thread submitting the ublk I/O writes to the io_desc, while the ublk
> server thread handling the I/O reads the io_desc. This basically
> guarantees a cache miss on both threads for each ublk I/O. Avoid the
> cache misses by writing the io_desc on the server thread in the kernel
> before dispatching the I/O to userspace.
> 
> [...]

Applied, thanks!

[1/8] ublk: consistently use u16 for queue and tag numbers
      commit: f510198855b6ddac0ffe62684dc407c56d3e0f24
[2/8] ublk: remove struct ublk_zoned_report_desc's operation field
      commit: 3a00b782a7b63b1876261ab883e1d8e1aa0e09fb
[3/8] ublk: split request validation from io_desc init
      commit: 8c76625ff9360cbe9ce0c47a624877aea14b3499
[4/8] ublk: initialize io_desc on daemon task
      commit: 735409f58b3da45094f2dfd7c18fb9e1937431f1
[5/8] ublk: add UBLK_F_IO_DESC_SIZE
      commit: 5c0958d80190822c4614ca00478d9acd9671bba6
[6/8] selftests: ublk: add support for --io_desc_size
      commit: fc01b96d74b3a9eec2b558d49ec9f5176473766a
[7/8] selftests: ublk: add UBLK_F_IO_DESC_SIZE test
      commit: d61d0f95e686be015cfaf193c0ae15156d1a0cc4
[8/8] ublk: lift checks out of ublk_{,un}map_io()
      commit: a8a79eba22dc4c11f2877bcf9e8557f6d95541ac

Best regards,
-- 
Jens Axboe