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If two processes do I/O close to each other, then BFQ merges the bfq_queues associated with these processes, to get a more sequential I/O, and thus a higher throughput. In this respect, to detect whether two processes are doing I/O close to each other, BFQ keeps a list of the head-of-line I/O requests of all active bfq_queues. The list is ordered by initial sectors, and implemented through a red-black tree (rq_pos_tree). Unfortunately, the update of the rq_pos_tree was incomplete, because the tree was not updated on the removal of the head-of-line I/O request of a bfq_queue, in case the queue did not remain empty. This commit adds the missing update. Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Angelo Ruocco <angeloruocco90@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.