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rt tasks are currently not eligible for schedtune boosting. Make it so by adding enqueue/dequeue hooks. For rt tasks, schedtune only acts as a frequency boosting framework, it has no impact on placement decisions and the prefer_idle attribute is not used. Also prepare schedutil use of boosted util for rt task boosting With this change, schedtune accounting will include rt class tasks, however boosting currently only applies to the utilization provided by fair class tasks. Sum up the tracked CPU utilization applying boost to the aggregate util instead - this includes RT task util in the boosting if any tasks are runnable. Scenario 1, considering one CPU: 1x rt task running, util 250, boost 0 1x cfs task runnable, util 250, boost 50 previous util=250+(50pct_boosted_250) = 887 new util=50_pct_boosted_500 = 762 Scenario 2, considering one CPU: 1x rt task running, util 250, boost 50 1x cfs task runnable, util 250, boost 0 previous util=250+250 = 500 new util=50_pct_boosted_500 = 762 Scenario 3, considering one CPU: 1x rt task running, util 250, boost 50 1x cfs task runnable, util 250, boost 50 previous util=250+(50pct_boosted_250) = 887 new util=50_pct_boosted_500 = 762 Scenario 4: 1x rt task running, util 250, boost 50 previous util=250 = 250 new util=50_pct_boosted_250 = 637 Change-Id: Ie287cbd0692468525095b5024db9faac8b2f4878 Signed-off-by: Chris Redpath <chris.redpath@arm.com> (cherry picked from commit 8e266aebf737262aeca9662254a3e61ccc7f8dec) [ - Fixed conflicts in sugov related to PELT signals of all classes - Fixed conflicts related to boosted_cpu_util being in a different location - Moved the CFS/RT util aggregation out of schedutil_freq_util to ease the integration with SchedTune ] 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.