From: Christoph Hellwig <hch@lst.de>
To: Qu Wenruo <wqu@suse.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Christian Brauner <brauner@kernel.org>,
"Darrick J. Wong" <djwong@kernel.org>,
Carlos Maiolino <cem@kernel.org>,
Al Viro <viro@zeniv.linux.org.uk>,
linux-block@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: bounce buffer direct I/O when stable pages are required
Date: Wed, 14 Jan 2026 13:39:54 +0100 [thread overview]
Message-ID: <20260114123954.GA4430@lst.de> (raw)
In-Reply-To: <f5568a83-75df-4e84-8cf0-01df6dd4e810@suse.com>
On Wed, Jan 14, 2026 at 08:22:27PM +1030, Qu Wenruo wrote:
> I guess the final reason to bounce other than falling back to buffered IO
> is still performance, especially for AIO cases?
It is to support AIO and parallel writers, yes.
> If iomap is going to handle the page bouncing I guess we btrfs people will
> be pretty happy to use that, without implementing our own bouncing code.
Given that btrfs runs all read completions from a workqueue I think
just setting the new IOMAP_DIO_BOUNCE flag and otherwise reverting
to the old direct I/O implementation should be all that is needed.
prev parent reply other threads:[~2026-01-14 12:39 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-14 7:40 bounce buffer direct I/O when stable pages are required Christoph Hellwig
2026-01-14 7:40 ` [PATCH 01/14] block: refactor get_contig_folio_len Christoph Hellwig
2026-01-14 7:41 ` [PATCH 02/14] block: open code bio_add_page and fix handling of mismatching P2P ranges Christoph Hellwig
2026-01-14 12:46 ` Johannes Thumshirn
2026-01-14 13:01 ` hch
2026-01-14 7:41 ` [PATCH 03/14] iov_iter: extract a iov_iter_extract_bvecs helper from bio code Christoph Hellwig
2026-01-14 7:41 ` [PATCH 04/14] block: remove bio_release_page Christoph Hellwig
2026-01-14 7:41 ` [PATCH 05/14] block: add helpers to bounce buffer an iov_iter into bios Christoph Hellwig
2026-01-14 12:51 ` Johannes Thumshirn
2026-01-14 7:41 ` [PATCH 06/14] iomap: fix submission side handling of completion side errors Christoph Hellwig
2026-01-14 22:35 ` Darrick J. Wong
2026-01-15 6:17 ` Christoph Hellwig
2026-01-14 7:41 ` [PATCH 07/14] iomap: simplify iomap_dio_bio_iter Christoph Hellwig
2026-01-14 22:51 ` Darrick J. Wong
2026-01-15 6:20 ` Christoph Hellwig
2026-01-14 7:41 ` [PATCH 08/14] iomap: split out the per-bio logic from iomap_dio_bio_iter Christoph Hellwig
2026-01-14 22:53 ` Darrick J. Wong
2026-01-14 7:41 ` [PATCH 09/14] iomap: share code between iomap_dio_bio_end_io and iomap_finish_ioend_direct Christoph Hellwig
2026-01-14 22:54 ` Darrick J. Wong
2026-01-14 7:41 ` [PATCH 10/14] iomap: free the bio before completing the dio Christoph Hellwig
2026-01-14 22:55 ` Darrick J. Wong
2026-01-15 6:21 ` Christoph Hellwig
2026-01-14 7:41 ` [PATCH 11/14] iomap: rename IOMAP_DIO_DIRTY to IOMAP_DIO_USER_BACKED Christoph Hellwig
2026-01-14 22:56 ` Darrick J. Wong
2026-01-14 7:41 ` [PATCH 12/14] iomap: support ioends for direct reads Christoph Hellwig
2026-01-14 22:57 ` Darrick J. Wong
2026-01-15 6:21 ` Christoph Hellwig
2026-01-14 7:41 ` [PATCH 13/14] iomap: add a flag to bounce buffer direct I/O Christoph Hellwig
2026-01-14 22:59 ` Darrick J. Wong
2026-01-15 6:21 ` Christoph Hellwig
2026-01-14 7:41 ` [PATCH 14/14] xfs: use bounce buffering direct I/O when the device requires stable pages Christoph Hellwig
2026-01-14 23:07 ` Darrick J. Wong
2026-01-15 6:24 ` Christoph Hellwig
2026-01-14 9:52 ` bounce buffer direct I/O when stable pages are required Qu Wenruo
2026-01-14 12:39 ` Christoph Hellwig [this message]
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