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9426414f0dJan Kara <jack@suse.cz> says: This patch series addresses lockups reported by users when systemd unit reading lots of files from a filesystem mounted with lazytime mount option exits. See patch 3 for more details about the reproducer. There are two main issues why switching many inodes between wbs: 1) Multiple workers will be spawned to do the switching but they all contend on the same wb->list_lock making all the parallelism pointless and just wasting time. 2) Sorting of wb->b_dirty list by dirtied_time_when is inherently slow. Patches 1-3 address these problems, patch 4 adds a tracepoint for better observability of inode writeback switching. * patches from https://lore.kernel.org/20250912103522.2935-1-jack@suse.cz: writeback: Add tracepoint to track pending inode switches writeback: Avoid excessively long inode switching times writeback: Avoid softlockup when switching many inodes writeback: Avoid contention on wb->list_lock when switching inodes Signed-off-by: Christian Brauner <brauner@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.