Re: [PATCHSET v6 0/3] Add support for ring mapped provided buffers

[Hao Xu <haoxu.linux@icloud.com>]

On 5/17/22 00:21, Jens Axboe wrote:
> Hi,
> 
> This series builds to adding support for a different way of doing
> provided buffers, which is a lot more efficient than the existing scheme
> for high rate of consumption/provision of buffers. The interesting bits
> here are patch 3, which also has some performance numbers an an
> explanation of it.
> 
> Patch 1 adds NOP support for provided buffers, just so that we can
> benchmark the last change.
> 
> Patch 2 just abstracts out the pinning code.
> 
> Patch 3 adds the actual feature.
> 
> This passes the full liburing suite, and various test cases I adopted
> to use ring provided buffers.
> 
> v6:
> - Change layout so that 'head' overlaps with reserved field in first
>    buffer, avoiding the weird split of first page having N-1 buffers and
>    the rest N (Dylan)
> - Rebase on current kernel bits
> - Fix missing ring unlock on out-of-bufs
> - Fix issue in io_recv()
> 
> Can also be found in my git repo, for-5.19/io_uring-pbuf branch:
> 
> https://git.kernel.dk/cgit/linux-block/log/?h=for-5.19/io_uring-pbuf
> 
> and there's an associated liburing branch too:
> 
> https://git.kernel.dk/cgit/liburing/log/?h=huge

should be the buf-ring branch I guess

> 
>   fs/io_uring.c                 | 323 +++++++++++++++++++++++++++++-----
>   include/uapi/linux/io_uring.h |  36 ++++
>   2 files changed, 319 insertions(+), 40 deletions(-)
>