[PATCHSET v5 0/3] Add support for ring mapped provided buffers

[Jens Axboe <axboe@kernel.dk>]

Hi,

This series builds to adding support for a different way of doing
provided 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 finally adds the feature.

This passes the full liburing suite, and various test cases I adopted
to use ring provided buffers.

v5:	- Minor cleanups
	- Rebase on current branch with prep patches folded in

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

 fs/io_uring.c                 | 324 +++++++++++++++++++++++++++++-----
 include/uapi/linux/io_uring.h |  28 +++
 2 files changed, 312 insertions(+), 40 deletions(-)

-- 
Jens Axboe