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894df937e0
A just-created bfq_queue, say Q, may happen to be merged with another bfq_queue on the very first invocation of the function __bfq_insert_request. In such a case, even if Q would clearly deserve interactive weight raising (as it has just been created), the function bfq_add_request does not make it to be invoked for Q, and thus to activate weight raising for Q. As a consequence, when the state of Q is saved for a possible future restore, after a split of Q from the other bfq_queue(s), such a state happens to be (unjustly) non-weight-raised. Then the bfq_queue will not enjoy any weight raising on the split, even if should still be in an interactive weight-raising period when the split occurs. This commit solves this problem as follows, for a just-created bfq_queue that is being early-merged: it stores directly, in the saved state of the bfq_queue, the weight-raising state that would have been assigned to the bfq_queue if not early-merged. Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Tested-by: Angelo Ruocco <angeloruocco90@gmail.com> Tested-by: Mirko Montanari <mirkomontanari91@gmail.com> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Tested-by: Lee Tibbert <lee.tibbert@gmail.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.