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b5e6c3e170
There's a priority inversion that exists currently with btrfs fsync. In some cases we will collect outstanding ordered extents onto a list and only wait on them at the very last second. However this "very last second" falls inside of a transaction handle, so if we are in a lower priority cgroup we can end up holding the transaction open for longer than needed, so if a high priority cgroup is also trying to fsync() it'll see latency. Signed-off-by: Josef Bacik <jbacik@fb.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.