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boosted_cpu_util() sums the CFS and RT util signals before they are used for frequency selection. While the util_avg signals are in sync, util_est prevents cpu_util_cfs() from decreasing when a CFS task is preempted by RT. This util_est behaviour is beneficial in many scenarios, but it can cause the sum of rt_util and cfs_util to go above SCHED_CAPACITY_SCALE. Although benign, this transient value appears in the stune tracepoints, and can cause confusion. Work around the problem by capping the util sum to SCHED_CAPACITY_SCALE. Bug: 120440300 Change-Id: I2be6eb157af86024e52ae11715f5637c77b201a3 Signed-off-by: Quentin Perret <quentin.perret@arm.com>
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.
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.