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Fri, 20 Mar 2026 09:45:54 -0700 (PDT) From: Jens Axboe To: Joanne Koong Cc: hch@infradead.org, asml.silence@gmail.com, bernd@bsbernd.com, csander@purestorage.com, krisman@suse.de, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org In-Reply-To: <20260306003224.3620942-1-joannelkoong@gmail.com> References: <20260306003224.3620942-1-joannelkoong@gmail.com> Subject: Re: [PATCH v3 0/8] io_uring: add kernel-managed buffer rings Message-Id: <177402515458.59192.3003058602103165983.b4-ty@kernel.dk> Date: Fri, 20 Mar 2026 10:45:54 -0600 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.14.3 On Thu, 05 Mar 2026 16:32:16 -0800, Joanne Koong 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. From > the uapi side, this goes through the pbuf ring interface, through the > IOU_PBUF_RING_KERNEL_MANAGED flag. > > There was a long discussion with Pavel on v1 [1] regarding the design. The > alternatives were to have the buffers allocated and registered through a > memory region or through the registered buffers interface and have fuse > implement ring buffer logic internally outside of io-uring. However, because > the buffers need to be contiguous for DMA and some high-performance fuse > servers may need non-fuse io-uring requests to use the buffer ring directly, > v3 keeps the design. > > [...] Applied, thanks! [1/8] io_uring/kbuf: add support for kernel-managed buffer rings commit: ff168843d80cd1855b646c5e8be2c6aa5bfb8adb [2/8] io_uring/kbuf: support kernel-managed buffer rings in buffer selection commit: bf4a6eb27f8135f36a5286bd5ba87bf6468c1283 [3/8] io_uring/kbuf: add buffer ring pinning/unpinning commit: b6ffe5399bc04abab4da9afb2ba092e6269d7077 [4/8] io_uring/kbuf: return buffer id in buffer selection commit: 9aa9e55e8bad1b65c9bcc2892101b06ae00c96d9 [5/8] io_uring/kbuf: add recycling for kernel managed buffer rings commit: de48bc0efc58d1ebf7e35c36dde6eb0e6b246b8c [6/8] io_uring/kbuf: add io_uring_is_kmbuf_ring() commit: 08b57b67602a98abf4b454a363263cba9fcfc91f [7/8] io_uring/kbuf: export io_ring_buffer_select() commit: 4706d1f235ff94f19b5c818bc0a3abd735903695 [8/8] io_uring/cmd: set selected buffer index in __io_uring_cmd_done() commit: 3515a2aedcdf459fc851df40a3712fc4a9a060f7 Best regards, -- Jens Axboe