From: Christoph Hellwig <hch@infradead.org>
To: Pavel Begunkov <asml.silence@gmail.com>
Cc: Joanne Koong <joannelkoong@gmail.com>,
axboe@kernel.dk, io-uring@vger.kernel.org,
csander@purestorage.com, krisman@suse.de, bernd@bsbernd.com,
hch@infradead.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v1 03/11] io_uring/kbuf: add support for kernel-managed buffer rings
Date: Wed, 11 Feb 2026 07:45:36 -0800 [thread overview]
Message-ID: <aYykILfX_u9-feH-@infradead.org> (raw)
In-Reply-To: <89c75fc1-2def-4681-a790-78b12b45478a@gmail.com>
On Tue, Feb 10, 2026 at 04:34:47PM +0000, Pavel Begunkov wrote:
> > + union {
> > + /* used for pbuf rings */
> > + __u64 ring_addr;
> > + /* used for kmbuf rings */
> > + __u32 buf_size;
>
> If you're creating a region, there should be no reason why it
> can't work with user passed memory. You're fencing yourself off
> optimisations that are already there like huge pages.
Any pages mapped to userspace can be allocated in the kernel as well.
And I really do like this design, because it means we can have a
buffer ring that is only mapped read-only into userspace. That way
we can still do zero-copy raids if the device requires stable pages
for checksumming or raid. I was going to implement this as soon
as this series lands upstream.
next prev parent reply other threads:[~2026-02-11 15:45 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-10 0:28 [PATCH v1 00/11] io_uring: add kernel-managed buffer rings Joanne Koong
2026-02-10 0:28 ` [PATCH v1 01/11] io_uring/kbuf: refactor io_register_pbuf_ring() logic into generic helpers Joanne Koong
2026-02-10 0:28 ` [PATCH v1 02/11] io_uring/kbuf: rename io_unregister_pbuf_ring() to io_unregister_buf_ring() Joanne Koong
2026-02-10 0:28 ` [PATCH v1 03/11] io_uring/kbuf: add support for kernel-managed buffer rings Joanne Koong
2026-02-10 16:34 ` Pavel Begunkov
2026-02-10 19:39 ` Joanne Koong
2026-02-11 12:01 ` Pavel Begunkov
2026-02-11 22:06 ` Joanne Koong
2026-02-12 10:07 ` Christoph Hellwig
2026-02-12 10:52 ` Pavel Begunkov
2026-02-12 17:29 ` Joanne Koong
2026-02-13 7:27 ` Christoph Hellwig
2026-02-13 7:21 ` Christoph Hellwig
2026-02-13 13:18 ` Pavel Begunkov
2026-02-11 15:45 ` Christoph Hellwig [this message]
2026-02-12 10:44 ` Pavel Begunkov
2026-02-13 7:18 ` Christoph Hellwig
2026-02-13 12:41 ` Pavel Begunkov
2026-02-10 0:28 ` [PATCH v1 04/11] io_uring/kbuf: add mmap " Joanne Koong
2026-02-10 1:02 ` Jens Axboe
2026-02-10 0:28 ` [PATCH v1 05/11] io_uring/kbuf: support kernel-managed buffer rings in buffer selection Joanne Koong
2026-02-10 0:28 ` [PATCH v1 06/11] io_uring/kbuf: add buffer ring pinning/unpinning Joanne Koong
2026-02-10 1:07 ` Jens Axboe
2026-02-10 17:57 ` Caleb Sander Mateos
2026-02-10 18:00 ` Jens Axboe
2026-02-10 0:28 ` [PATCH v1 07/11] io_uring/kbuf: add recycling for kernel managed buffer rings Joanne Koong
2026-02-10 0:52 ` Jens Axboe
2026-02-10 0:28 ` [PATCH v1 08/11] io_uring/kbuf: add io_uring_is_kmbuf_ring() Joanne Koong
2026-02-10 0:28 ` [PATCH v1 09/11] io_uring/kbuf: export io_ring_buffer_select() Joanne Koong
2026-02-10 0:28 ` [PATCH v1 10/11] io_uring/kbuf: return buffer id in buffer selection Joanne Koong
2026-02-10 0:53 ` Jens Axboe
2026-02-10 22:36 ` Joanne Koong
2026-02-10 0:28 ` [PATCH v1 11/11] io_uring/cmd: set selected buffer index in __io_uring_cmd_done() Joanne Koong
2026-02-10 0:55 ` [PATCH v1 00/11] io_uring: add kernel-managed buffer rings Jens Axboe
2026-02-10 22:45 ` Joanne Koong
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