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Suppose that I/O dispatch is plugged, to wait for new I/O for the in-service bfq-queue, say bfqq. Suppose then that there is a further bfq_queue woken by bfqq, and that this woken queue has pending I/O. A woken queue does not steal bandwidth from bfqq, because it remains soon without I/O if bfqq is not served. So there is virtually no risk of loss of bandwidth for bfqq if this woken queue has I/O dispatched while bfqq is waiting for new I/O. In contrast, this extra I/O injection boosts throughput. This commit performs this extra injection. Tested-by: Jan Kara <jack@suse.cz> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Link: https://lore.kernel.org/r/20210304174627.161-2-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.