Re: [PATCH v2 0/9] io_uring: add kernel-managed buffer rings

[Joanne Koong <joannelkoong@gmail.com>]

On Tue, Feb 17, 2026 at 6:56 PM Joanne Koong <joannelkoong@gmail.com> wrote:
>
> Currently, io_uring buffer rings require the application to allocate and
> manage the backing buffers. This series introduces buffer rings, where
> the kernel allocates and manages the buffers on behalf of the application.
>
> This is split out from the fuse over io_uring series in [1], which needs the
> kernel to own and manage buffers shared between the fuse server and the
> kernel.
>
> This series is on top of commit 73cf88d775b1f55 in the for-next branch in
> Jens' io-uring tree. The corresponding liburing changes are in [2] and will
> be submitted after the changes in this patchset are accepted.
>
> There was a discussion on v1 about having kernel-managed buffer rings go
> through a user-provided registered memory region. This changes proposed in
> this patchset add a simple straightforward interface where the kernel
> allocates the buffers and the buffers are tied to the lifecycle of the ring,
> which suffices for the majority of use cases. If/when in the future it is
> useful for the buffers to be backed by a prior user registered mem region
> (eg for PMD optimization gains), the changes in this patchset do not preclude
> support for that from being added.
>
> The link to the fuse commits that use the changes in this series is in [3].
>
> Thanks,
> Joanne

I'm going to update v2 with another version, as per the conversation
in this thread [1].

Thanks,
Joanne

[1] https://lore.kernel.org/linux-fsdevel/20260210002852.1394504-1-joannelkoong@gmail.com/T/#t