From: Christoph Hellwig <hch@lst.de>
To: Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Carlos Maiolino <cem@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
willy@infradead.org, dlemoal@kernel.org, hans.holmberg@wdc.com,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-xfs@vger.kernel.org
Subject: allow file systems to increase the minimum writeback chunk size
Date: Wed, 15 Oct 2025 15:27:13 +0900 [thread overview]
Message-ID: <20251015062728.60104-1-hch@lst.de> (raw)
Hi all,
The relatively low minimal writeback size of 4MiB leads means that
written back inodes on rotational media are switched a lot. Besides
introducing additional seeks, this also can lead to extreme file
fragmentation on zoned devices when a lot of files are cached relative
to the available writeback bandwidth.
Add a superblock field that allows the file system to override the
default size, and set it to the zone size for zoned XFS.
Diffstat:
b/fs/fs-writeback.c | 14 +++++---------
b/fs/super.c | 1 +
b/fs/xfs/xfs_zone_alloc.c | 7 +++++--
b/include/linux/fs.h | 1 +
b/include/linux/writeback.h | 5 +++++
fs/fs-writeback.c | 14 +++++---------
6 files changed, 22 insertions(+), 20 deletions(-)
next reply other threads:[~2025-10-15 6:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-15 6:27 Christoph Hellwig [this message]
2025-10-15 6:27 ` [PATCH 1/3] writeback: cleanup writeback_chunk_size Christoph Hellwig
2025-10-15 7:05 ` Damien Le Moal
2025-10-15 15:48 ` Darrick J. Wong
2025-10-20 9:34 ` Jan Kara
2025-10-15 6:27 ` [PATCH 2/3] writeback: allow the file system to override MIN_WRITEBACK_PAGES Christoph Hellwig
2025-10-15 7:09 ` Damien Le Moal
2025-10-15 7:27 ` Christoph Hellwig
2025-10-15 15:13 ` Theodore Ts'o
2025-10-16 4:33 ` Christoph Hellwig
2025-10-15 15:57 ` Darrick J. Wong
2025-10-16 4:37 ` Christoph Hellwig
2025-10-15 20:49 ` Dave Chinner
2025-10-16 4:39 ` Christoph Hellwig
2025-10-16 8:23 ` Dave Chinner
2025-10-15 6:27 ` [PATCH 3/3] xfs: set s_min_writeback_pages for zoned file systems Christoph Hellwig
2025-10-15 7:10 ` Damien Le Moal
2025-10-15 16:01 ` Darrick J. Wong
2025-10-15 7:11 ` allow file systems to increase the minimum writeback chunk size Damien Le Moal
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