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commitff042f4a9b("mm: lru_cache_disable: replace work queue synchronization with synchronize_rcu") replaced lru_cache_disable's usage of work queues with synchronize_rcu. Some users reported large performance regressions due to this commit, for example: https://lore.kernel.org/all/20220521234616.GO1790663@paulmck-ThinkPad-P17-Gen-1/T/ Switching to synchronize_rcu_expedited fixes the problem. Link: https://lkml.kernel.org/r/YpToHCmnx/HEcVyR@fuller.cnet Fixes:ff042f4a9b("mm: lru_cache_disable: replace work queue synchronization with synchronize_rcu") Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Tested-by: Michael Larabel <Michael@MichaelLarabel.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Nicolas Saenz Julienne <nsaenzju@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Minchan Kim <minchan@kernel.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Phil Elwell <phil@raspberrypi.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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 Restructured Text 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.