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Upon an I/O-dispatch attempt, BFQ may detect that it was better to plug I/O dispatch, and to wait for a new request to arrive for the currently in-service queue. But the arrival of a new request for an empty bfq_queue, and thus the switch from idle to busy of the bfq_queue, may cause the scenario to change, and make plugging no longer needed for service guarantees, or more convenient for throughput. In this case, keeping I/O-dispatch plugged would certainly lower throughput. To address this issue, this commit makes such a check, and stops plugging I/O if it is better to stop plugging I/O. Tested-by: Jan Kara <jack@suse.cz> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.