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4403e4e467
When two or more processes do I/O in a way that the their requests are sequential in respect to one another, BFQ merges the bfq_queues associated with the processes. This way the overall I/O pattern becomes sequential, and thus there is a boost in througput. These cooperating processes usually start or restart to do I/O shortly after each other. So, in order to avoid merging non-cooperating processes, BFQ ensures that none of these queues has been in weight raising for too long. In this respect, from commit "block, bfq-sq, bfq-mq: let a queue be merged only shortly after being created", BFQ checks whether any queue (and not only weight-raised ones) is doing I/O continuously from too long to be merged. This new additional check makes the first one useless: a queue doing I/O from long enough, if being weight-raised, is also a queue in weight raising for too long to be merged. Accordingly, this commit removes the first check. Signed-off-by: Angelo Ruocco <angeloruocco90@gmail.com> Signed-off-by: Paolo Valente <paolo.valente@linaro.com> 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.