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If parent inode is not watching, check for the event in masks of sb/mount/inode masks early to optimize out most of the code in __fsnotify_parent() and avoid calling fsnotify(). Jens has reported that this optimization improves BW and IOPS in an io_uring benchmark by more than 10% and reduces perf reported CPU usage. before: + 4.51% io_uring [kernel.vmlinux] [k] fsnotify + 3.67% io_uring [kernel.vmlinux] [k] __fsnotify_parent after: + 2.37% io_uring [kernel.vmlinux] [k] __fsnotify_parent Reported-and-tested-by: Jens Axboe <axboe@kernel.dk> Link: https://lore.kernel.org/linux-fsdevel/b45bd8ff-5654-4e67-90a6-aad5e6759e0b@kernel.dk/ Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz> Message-Id: <20240116113247.758848-1-amir73il@gmail.com>
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.