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The rate_limit_us tunable is intended to reduce the possible overhead from running the schedutil governor. However, that overhead can be divided into two separate parts: the governor computations and the invocation of the scaling driver to set the CPU frequency. The latter is where the real overhead comes from. The former is much less expensive in terms of execution time and running it every time the governor callback is invoked by the scheduler, after rate_limit_us interval has passed since the last frequency update, would not be a problem. For this reason, redefine the rate_limit_us tunable so that it means the minimum time that has to pass between two consecutive invocations of the scaling driver by the schedutil governor (to set the CPU frequency). Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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.