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Because the cost of calling tick_nohz_get_sleep_length() may increase in the future, reorder the code in menu_select() so it first uses the statistics to determine the expected idle duration. If that value is higher than RESIDENCY_THRESHOLD_NS, tick_nohz_get_sleep_length() will be called to obtain the time till the closest timer and refine the idle duration prediction if necessary. This causes the governor to always take the full overhead of get_typical_interval() with the assumption that the cost will be amortized by skipping the tick_nohz_get_sleep_length() call in the cases when the predicted idle duration is relatively very small. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Doug Smythies <dsmythies@telus.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.