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1be6e8a964
A just-created bfq_queue will certainly be deemed as interactive on the arrival of its first I/O request, if the low_latency flag is set. Yet, if the queue is merged with another queue on the arrival of its first I/O request, it will not have the chance to be flagged as interactive. Nevertheless, if the queue is then split soon enough, it has to be flagged as interactive after the split. To handle this early-merge scenario correctly, BFQ saves the state of the queue, on the merge, as if the latter had already been deemed interactive. So, if the queue is split soon, it will get weight-raised, because the previous state of the queue is resumed on the split. Unfortunately, in the act of saving the state of the newly-created queue, BFQ doesn't check whether the low_latency flag is set, and this causes early-merged queues to be then weight-raised, on queue splits, even if low_latency is off. This commit addresses this problem by adding the missing check. Signed-off-by: Angelo Ruocco <angeloruocco90@gmail.com> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.